| 1 |
1275 |
phoenix |
/*
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* Copyright (C) International Business Machines Corp., 2000-2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* jfs_xtree.c: extent allocation descriptor B+-tree manager
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*/
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#include <linux/fs.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_metapage.h"
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#include "jfs_dmap.h"
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#include "jfs_dinode.h"
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#include "jfs_superblock.h"
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#include "jfs_debug.h"
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/*
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* xtree local flag
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*/
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#define XT_INSERT 0x00000001
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/*
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* xtree key/entry comparison: extent offset
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*
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* return:
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* -1: k < start of extent
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* 0: start_of_extent <= k <= end_of_extent
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* 1: k > end_of_extent
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*/
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#define XT_CMP(CMP, K, X, OFFSET64)\
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{\
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OFFSET64 = offsetXAD(X);\
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(CMP) = ((K) >= OFFSET64 + lengthXAD(X)) ? 1 :\
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| 48 |
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((K) < OFFSET64) ? -1 : 0;\
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| 49 |
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}
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| 50 |
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| 51 |
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/* write a xad entry */
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#define XT_PUTENTRY(XAD, FLAG, OFF, LEN, ADDR)\
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{\
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(XAD)->flag = (FLAG);\
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XADoffset((XAD), (OFF));\
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XADlength((XAD), (LEN));\
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XADaddress((XAD), (ADDR));\
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}
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#define XT_PAGE(IP, MP) BT_PAGE(IP, MP, xtpage_t, i_xtroot)
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| 62 |
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/* get page buffer for specified block address */
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/* ToDo: Replace this ugly macro with a function */
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#define XT_GETPAGE(IP, BN, MP, SIZE, P, RC)\
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{\
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BT_GETPAGE(IP, BN, MP, xtpage_t, SIZE, P, RC, i_xtroot)\
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if (!(RC))\
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{\
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if ((le16_to_cpu((P)->header.nextindex) < XTENTRYSTART) ||\
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(le16_to_cpu((P)->header.nextindex) > le16_to_cpu((P)->header.maxentry)) ||\
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(le16_to_cpu((P)->header.maxentry) > (((BN)==0)?XTROOTMAXSLOT:PSIZE>>L2XTSLOTSIZE)))\
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{\
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jfs_error((IP)->i_sb, "XT_GETPAGE: xtree page corrupt");\
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BT_PUTPAGE(MP);\
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MP = NULL;\
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RC = -EIO;\
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}\
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}\
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}
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/* for consistency */
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#define XT_PUTPAGE(MP) BT_PUTPAGE(MP)
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| 84 |
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#define XT_GETSEARCH(IP, LEAF, BN, MP, P, INDEX) \
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BT_GETSEARCH(IP, LEAF, BN, MP, xtpage_t, P, INDEX, i_xtroot)
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/* xtree entry parameter descriptor */
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struct xtsplit {
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struct metapage *mp;
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s16 index;
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u8 flag;
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s64 off;
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s64 addr;
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int len;
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struct pxdlist *pxdlist;
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};
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/*
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* statistics
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*/
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#ifdef CONFIG_JFS_STATISTICS
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static struct {
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uint search;
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uint fastSearch;
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uint split;
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} xtStat;
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#endif
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| 109 |
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| 110 |
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/*
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* forward references
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*/
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static int xtSearch(struct inode *ip,
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s64 xoff, int *cmpp, struct btstack * btstack, int flag);
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| 116 |
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static int xtSplitUp(tid_t tid,
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struct inode *ip,
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struct xtsplit * split, struct btstack * btstack);
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| 119 |
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| 120 |
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static int xtSplitPage(tid_t tid, struct inode *ip, struct xtsplit * split,
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struct metapage ** rmpp, s64 * rbnp);
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static int xtSplitRoot(tid_t tid, struct inode *ip,
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struct xtsplit * split, struct metapage ** rmpp);
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| 126 |
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#ifdef _STILL_TO_PORT
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static int xtDeleteUp(tid_t tid, struct inode *ip, struct metapage * fmp,
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xtpage_t * fp, struct btstack * btstack);
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static int xtSearchNode(struct inode *ip,
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xad_t * xad,
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int *cmpp, struct btstack * btstack, int flag);
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| 133 |
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| 134 |
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static int xtRelink(tid_t tid, struct inode *ip, xtpage_t * fp);
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#endif /* _STILL_TO_PORT */
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/* External references */
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| 138 |
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/*
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* debug control
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*/
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| 142 |
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/* #define _JFS_DEBUG_XTREE 1 */
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| 143 |
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| 144 |
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| 145 |
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/*
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| 146 |
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* xtLookup()
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*
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* function: map a single page into a physical extent;
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| 149 |
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*/
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| 150 |
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int xtLookup(struct inode *ip, s64 lstart,
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s64 llen, int *pflag, s64 * paddr, s32 * plen, int no_check)
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{
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| 153 |
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int rc = 0;
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| 154 |
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struct btstack btstack;
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int cmp;
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| 156 |
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s64 bn;
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| 157 |
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struct metapage *mp;
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xtpage_t *p;
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| 159 |
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int index;
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xad_t *xad;
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s64 size, xoff, xend;
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int xlen;
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s64 xaddr;
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*plen = 0;
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if (!no_check) {
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/* is lookup offset beyond eof ? */
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size = ((u64) ip->i_size + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
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JFS_SBI(ip->i_sb)->l2bsize;
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if (lstart >= size) {
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jfs_err("xtLookup: lstart (0x%lx) >= size (0x%lx)",
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(ulong) lstart, (ulong) size);
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return 0;
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| 175 |
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}
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| 176 |
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}
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| 177 |
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| 178 |
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/*
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* search for the xad entry covering the logical extent
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| 180 |
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*/
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| 181 |
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//search:
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| 182 |
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if ((rc = xtSearch(ip, lstart, &cmp, &btstack, 0))) {
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| 183 |
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jfs_err("xtLookup: xtSearch returned %d", rc);
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| 184 |
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return rc;
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| 185 |
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}
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| 186 |
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| 187 |
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/*
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| 188 |
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* compute the physical extent covering logical extent
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| 189 |
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*
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| 190 |
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* N.B. search may have failed (e.g., hole in sparse file),
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| 191 |
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* and returned the index of the next entry.
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| 192 |
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*/
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| 193 |
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/* retrieve search result */
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| 194 |
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XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
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| 195 |
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| 196 |
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/* is xad found covering start of logical extent ?
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| 197 |
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* lstart is a page start address,
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| 198 |
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* i.e., lstart cannot start in a hole;
|
| 199 |
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*/
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| 200 |
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if (cmp)
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| 201 |
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goto out;
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| 202 |
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|
| 203 |
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/*
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| 204 |
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* lxd covered by xad
|
| 205 |
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*/
|
| 206 |
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xad = &p->xad[index];
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| 207 |
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xoff = offsetXAD(xad);
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| 208 |
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xlen = lengthXAD(xad);
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| 209 |
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xend = xoff + xlen;
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| 210 |
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xaddr = addressXAD(xad);
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| 211 |
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|
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| 212 |
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/* initialize new pxd */
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| 213 |
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*pflag = xad->flag;
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| 214 |
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*paddr = xaddr + (lstart - xoff);
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| 215 |
|
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/* a page must be fully covered by an xad */
|
| 216 |
|
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*plen = min(xend - lstart, llen);
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| 217 |
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|
|
| 218 |
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out:
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| 219 |
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XT_PUTPAGE(mp);
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| 220 |
|
|
|
| 221 |
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return rc;
|
| 222 |
|
|
}
|
| 223 |
|
|
|
| 224 |
|
|
|
| 225 |
|
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/*
|
| 226 |
|
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* xtLookupList()
|
| 227 |
|
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*
|
| 228 |
|
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* function: map a single logical extent into a list of physical extent;
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| 229 |
|
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*
|
| 230 |
|
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* parameter:
|
| 231 |
|
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* struct inode *ip,
|
| 232 |
|
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* struct lxdlist *lxdlist, lxd list (in)
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| 233 |
|
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* struct xadlist *xadlist, xad list (in/out)
|
| 234 |
|
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* int flag)
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| 235 |
|
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*
|
| 236 |
|
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* coverage of lxd by xad under assumption of
|
| 237 |
|
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* . lxd's are ordered and disjoint.
|
| 238 |
|
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* . xad's are ordered and disjoint.
|
| 239 |
|
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*
|
| 240 |
|
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* return:
|
| 241 |
|
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* 0: success
|
| 242 |
|
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*
|
| 243 |
|
|
* note: a page being written (even a single byte) is backed fully,
|
| 244 |
|
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* except the last page which is only backed with blocks
|
| 245 |
|
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* required to cover the last byte;
|
| 246 |
|
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* the extent backing a page is fully contained within an xad;
|
| 247 |
|
|
*/
|
| 248 |
|
|
int xtLookupList(struct inode *ip, struct lxdlist * lxdlist,
|
| 249 |
|
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struct xadlist * xadlist, int flag)
|
| 250 |
|
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{
|
| 251 |
|
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int rc = 0;
|
| 252 |
|
|
struct btstack btstack;
|
| 253 |
|
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int cmp;
|
| 254 |
|
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s64 bn;
|
| 255 |
|
|
struct metapage *mp;
|
| 256 |
|
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xtpage_t *p;
|
| 257 |
|
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int index;
|
| 258 |
|
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lxd_t *lxd;
|
| 259 |
|
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xad_t *xad, *pxd;
|
| 260 |
|
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s64 size, lstart, lend, xstart, xend, pstart;
|
| 261 |
|
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s64 llen, xlen, plen;
|
| 262 |
|
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s64 xaddr, paddr;
|
| 263 |
|
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int nlxd, npxd, maxnpxd;
|
| 264 |
|
|
|
| 265 |
|
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npxd = xadlist->nxad = 0;
|
| 266 |
|
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maxnpxd = xadlist->maxnxad;
|
| 267 |
|
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pxd = xadlist->xad;
|
| 268 |
|
|
|
| 269 |
|
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nlxd = lxdlist->nlxd;
|
| 270 |
|
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lxd = lxdlist->lxd;
|
| 271 |
|
|
|
| 272 |
|
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lstart = offsetLXD(lxd);
|
| 273 |
|
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llen = lengthLXD(lxd);
|
| 274 |
|
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lend = lstart + llen;
|
| 275 |
|
|
|
| 276 |
|
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size = (ip->i_size + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
|
| 277 |
|
|
JFS_SBI(ip->i_sb)->l2bsize;
|
| 278 |
|
|
|
| 279 |
|
|
/*
|
| 280 |
|
|
* search for the xad entry covering the logical extent
|
| 281 |
|
|
*/
|
| 282 |
|
|
search:
|
| 283 |
|
|
if (lstart >= size)
|
| 284 |
|
|
return 0;
|
| 285 |
|
|
|
| 286 |
|
|
if ((rc = xtSearch(ip, lstart, &cmp, &btstack, 0)))
|
| 287 |
|
|
return rc;
|
| 288 |
|
|
|
| 289 |
|
|
/*
|
| 290 |
|
|
* compute the physical extent covering logical extent
|
| 291 |
|
|
*
|
| 292 |
|
|
* N.B. search may have failed (e.g., hole in sparse file),
|
| 293 |
|
|
* and returned the index of the next entry.
|
| 294 |
|
|
*/
|
| 295 |
|
|
//map:
|
| 296 |
|
|
/* retrieve search result */
|
| 297 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 298 |
|
|
|
| 299 |
|
|
/* is xad on the next sibling page ? */
|
| 300 |
|
|
if (index == le16_to_cpu(p->header.nextindex)) {
|
| 301 |
|
|
if (p->header.flag & BT_ROOT)
|
| 302 |
|
|
goto mapend;
|
| 303 |
|
|
|
| 304 |
|
|
if ((bn = le64_to_cpu(p->header.next)) == 0)
|
| 305 |
|
|
goto mapend;
|
| 306 |
|
|
|
| 307 |
|
|
XT_PUTPAGE(mp);
|
| 308 |
|
|
|
| 309 |
|
|
/* get next sibling page */
|
| 310 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 311 |
|
|
if (rc)
|
| 312 |
|
|
return rc;
|
| 313 |
|
|
|
| 314 |
|
|
index = XTENTRYSTART;
|
| 315 |
|
|
}
|
| 316 |
|
|
|
| 317 |
|
|
xad = &p->xad[index];
|
| 318 |
|
|
|
| 319 |
|
|
/*
|
| 320 |
|
|
* is lxd covered by xad ?
|
| 321 |
|
|
*/
|
| 322 |
|
|
compare:
|
| 323 |
|
|
xstart = offsetXAD(xad);
|
| 324 |
|
|
xlen = lengthXAD(xad);
|
| 325 |
|
|
xend = xstart + xlen;
|
| 326 |
|
|
xaddr = addressXAD(xad);
|
| 327 |
|
|
|
| 328 |
|
|
compare1:
|
| 329 |
|
|
if (xstart < lstart)
|
| 330 |
|
|
goto compare2;
|
| 331 |
|
|
|
| 332 |
|
|
/* (lstart <= xstart) */
|
| 333 |
|
|
|
| 334 |
|
|
/* lxd is NOT covered by xad */
|
| 335 |
|
|
if (lend <= xstart) {
|
| 336 |
|
|
/*
|
| 337 |
|
|
* get next lxd
|
| 338 |
|
|
*/
|
| 339 |
|
|
if (--nlxd == 0)
|
| 340 |
|
|
goto mapend;
|
| 341 |
|
|
lxd++;
|
| 342 |
|
|
|
| 343 |
|
|
lstart = offsetLXD(lxd);
|
| 344 |
|
|
llen = lengthLXD(lxd);
|
| 345 |
|
|
lend = lstart + llen;
|
| 346 |
|
|
if (lstart >= size)
|
| 347 |
|
|
goto mapend;
|
| 348 |
|
|
|
| 349 |
|
|
/* compare with the current xad */
|
| 350 |
|
|
goto compare1;
|
| 351 |
|
|
}
|
| 352 |
|
|
/* lxd is covered by xad */
|
| 353 |
|
|
else { /* (xstart < lend) */
|
| 354 |
|
|
|
| 355 |
|
|
/* initialize new pxd */
|
| 356 |
|
|
pstart = xstart;
|
| 357 |
|
|
plen = min(lend - xstart, xlen);
|
| 358 |
|
|
paddr = xaddr;
|
| 359 |
|
|
|
| 360 |
|
|
goto cover;
|
| 361 |
|
|
}
|
| 362 |
|
|
|
| 363 |
|
|
/* (xstart < lstart) */
|
| 364 |
|
|
compare2:
|
| 365 |
|
|
/* lxd is covered by xad */
|
| 366 |
|
|
if (lstart < xend) {
|
| 367 |
|
|
/* initialize new pxd */
|
| 368 |
|
|
pstart = lstart;
|
| 369 |
|
|
plen = min(xend - lstart, llen);
|
| 370 |
|
|
paddr = xaddr + (lstart - xstart);
|
| 371 |
|
|
|
| 372 |
|
|
goto cover;
|
| 373 |
|
|
}
|
| 374 |
|
|
/* lxd is NOT covered by xad */
|
| 375 |
|
|
else { /* (xend <= lstart) */
|
| 376 |
|
|
|
| 377 |
|
|
/*
|
| 378 |
|
|
* get next xad
|
| 379 |
|
|
*
|
| 380 |
|
|
* linear search next xad covering lxd on
|
| 381 |
|
|
* the current xad page, and then tree search
|
| 382 |
|
|
*/
|
| 383 |
|
|
if (index == le16_to_cpu(p->header.nextindex) - 1) {
|
| 384 |
|
|
if (p->header.flag & BT_ROOT)
|
| 385 |
|
|
goto mapend;
|
| 386 |
|
|
|
| 387 |
|
|
XT_PUTPAGE(mp);
|
| 388 |
|
|
goto search;
|
| 389 |
|
|
} else {
|
| 390 |
|
|
index++;
|
| 391 |
|
|
xad++;
|
| 392 |
|
|
|
| 393 |
|
|
/* compare with new xad */
|
| 394 |
|
|
goto compare;
|
| 395 |
|
|
}
|
| 396 |
|
|
}
|
| 397 |
|
|
|
| 398 |
|
|
/*
|
| 399 |
|
|
* lxd is covered by xad and a new pxd has been initialized
|
| 400 |
|
|
* (lstart <= xstart < lend) or (xstart < lstart < xend)
|
| 401 |
|
|
*/
|
| 402 |
|
|
cover:
|
| 403 |
|
|
/* finalize pxd corresponding to current xad */
|
| 404 |
|
|
XT_PUTENTRY(pxd, xad->flag, pstart, plen, paddr);
|
| 405 |
|
|
|
| 406 |
|
|
if (++npxd >= maxnpxd)
|
| 407 |
|
|
goto mapend;
|
| 408 |
|
|
pxd++;
|
| 409 |
|
|
|
| 410 |
|
|
/*
|
| 411 |
|
|
* lxd is fully covered by xad
|
| 412 |
|
|
*/
|
| 413 |
|
|
if (lend <= xend) {
|
| 414 |
|
|
/*
|
| 415 |
|
|
* get next lxd
|
| 416 |
|
|
*/
|
| 417 |
|
|
if (--nlxd == 0)
|
| 418 |
|
|
goto mapend;
|
| 419 |
|
|
lxd++;
|
| 420 |
|
|
|
| 421 |
|
|
lstart = offsetLXD(lxd);
|
| 422 |
|
|
llen = lengthLXD(lxd);
|
| 423 |
|
|
lend = lstart + llen;
|
| 424 |
|
|
if (lstart >= size)
|
| 425 |
|
|
goto mapend;
|
| 426 |
|
|
|
| 427 |
|
|
/*
|
| 428 |
|
|
* test for old xad covering new lxd
|
| 429 |
|
|
* (old xstart < new lstart)
|
| 430 |
|
|
*/
|
| 431 |
|
|
goto compare2;
|
| 432 |
|
|
}
|
| 433 |
|
|
/*
|
| 434 |
|
|
* lxd is partially covered by xad
|
| 435 |
|
|
*/
|
| 436 |
|
|
else { /* (xend < lend) */
|
| 437 |
|
|
|
| 438 |
|
|
/*
|
| 439 |
|
|
* get next xad
|
| 440 |
|
|
*
|
| 441 |
|
|
* linear search next xad covering lxd on
|
| 442 |
|
|
* the current xad page, and then next xad page search
|
| 443 |
|
|
*/
|
| 444 |
|
|
if (index == le16_to_cpu(p->header.nextindex) - 1) {
|
| 445 |
|
|
if (p->header.flag & BT_ROOT)
|
| 446 |
|
|
goto mapend;
|
| 447 |
|
|
|
| 448 |
|
|
if ((bn = le64_to_cpu(p->header.next)) == 0)
|
| 449 |
|
|
goto mapend;
|
| 450 |
|
|
|
| 451 |
|
|
XT_PUTPAGE(mp);
|
| 452 |
|
|
|
| 453 |
|
|
/* get next sibling page */
|
| 454 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 455 |
|
|
if (rc)
|
| 456 |
|
|
return rc;
|
| 457 |
|
|
|
| 458 |
|
|
index = XTENTRYSTART;
|
| 459 |
|
|
xad = &p->xad[index];
|
| 460 |
|
|
} else {
|
| 461 |
|
|
index++;
|
| 462 |
|
|
xad++;
|
| 463 |
|
|
}
|
| 464 |
|
|
|
| 465 |
|
|
/*
|
| 466 |
|
|
* test for new xad covering old lxd
|
| 467 |
|
|
* (old lstart < new xstart)
|
| 468 |
|
|
*/
|
| 469 |
|
|
goto compare;
|
| 470 |
|
|
}
|
| 471 |
|
|
|
| 472 |
|
|
mapend:
|
| 473 |
|
|
xadlist->nxad = npxd;
|
| 474 |
|
|
|
| 475 |
|
|
//out:
|
| 476 |
|
|
XT_PUTPAGE(mp);
|
| 477 |
|
|
|
| 478 |
|
|
return rc;
|
| 479 |
|
|
}
|
| 480 |
|
|
|
| 481 |
|
|
|
| 482 |
|
|
/*
|
| 483 |
|
|
* xtSearch()
|
| 484 |
|
|
*
|
| 485 |
|
|
* function: search for the xad entry covering specified offset.
|
| 486 |
|
|
*
|
| 487 |
|
|
* parameters:
|
| 488 |
|
|
* ip - file object;
|
| 489 |
|
|
* xoff - extent offset;
|
| 490 |
|
|
* cmpp - comparison result:
|
| 491 |
|
|
* btstack - traverse stack;
|
| 492 |
|
|
* flag - search process flag (XT_INSERT);
|
| 493 |
|
|
*
|
| 494 |
|
|
* returns:
|
| 495 |
|
|
* btstack contains (bn, index) of search path traversed to the entry.
|
| 496 |
|
|
* *cmpp is set to result of comparison with the entry returned.
|
| 497 |
|
|
* the page containing the entry is pinned at exit.
|
| 498 |
|
|
*/
|
| 499 |
|
|
static int xtSearch(struct inode *ip, s64 xoff, /* offset of extent */
|
| 500 |
|
|
int *cmpp, struct btstack * btstack, int flag)
|
| 501 |
|
|
{
|
| 502 |
|
|
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
|
| 503 |
|
|
int rc = 0;
|
| 504 |
|
|
int cmp = 1; /* init for empty page */
|
| 505 |
|
|
s64 bn; /* block number */
|
| 506 |
|
|
struct metapage *mp; /* page buffer */
|
| 507 |
|
|
xtpage_t *p; /* page */
|
| 508 |
|
|
xad_t *xad;
|
| 509 |
|
|
int base, index, lim, btindex;
|
| 510 |
|
|
struct btframe *btsp;
|
| 511 |
|
|
int nsplit = 0; /* number of pages to split */
|
| 512 |
|
|
s64 t64;
|
| 513 |
|
|
|
| 514 |
|
|
INCREMENT(xtStat.search);
|
| 515 |
|
|
|
| 516 |
|
|
BT_CLR(btstack);
|
| 517 |
|
|
|
| 518 |
|
|
btstack->nsplit = 0;
|
| 519 |
|
|
|
| 520 |
|
|
/*
|
| 521 |
|
|
* search down tree from root:
|
| 522 |
|
|
*
|
| 523 |
|
|
* between two consecutive entries of <Ki, Pi> and <Kj, Pj> of
|
| 524 |
|
|
* internal page, child page Pi contains entry with k, Ki <= K < Kj.
|
| 525 |
|
|
*
|
| 526 |
|
|
* if entry with search key K is not found
|
| 527 |
|
|
* internal page search find the entry with largest key Ki
|
| 528 |
|
|
* less than K which point to the child page to search;
|
| 529 |
|
|
* leaf page search find the entry with smallest key Kj
|
| 530 |
|
|
* greater than K so that the returned index is the position of
|
| 531 |
|
|
* the entry to be shifted right for insertion of new entry.
|
| 532 |
|
|
* for empty tree, search key is greater than any key of the tree.
|
| 533 |
|
|
*
|
| 534 |
|
|
* by convention, root bn = 0.
|
| 535 |
|
|
*/
|
| 536 |
|
|
for (bn = 0;;) {
|
| 537 |
|
|
/* get/pin the page to search */
|
| 538 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 539 |
|
|
if (rc)
|
| 540 |
|
|
return rc;
|
| 541 |
|
|
|
| 542 |
|
|
/* try sequential access heuristics with the previous
|
| 543 |
|
|
* access entry in target leaf page:
|
| 544 |
|
|
* once search narrowed down into the target leaf,
|
| 545 |
|
|
* key must either match an entry in the leaf or
|
| 546 |
|
|
* key entry does not exist in the tree;
|
| 547 |
|
|
*/
|
| 548 |
|
|
//fastSearch:
|
| 549 |
|
|
if ((jfs_ip->btorder & BT_SEQUENTIAL) &&
|
| 550 |
|
|
(p->header.flag & BT_LEAF) &&
|
| 551 |
|
|
(index = jfs_ip->btindex) <
|
| 552 |
|
|
le16_to_cpu(p->header.nextindex)) {
|
| 553 |
|
|
xad = &p->xad[index];
|
| 554 |
|
|
t64 = offsetXAD(xad);
|
| 555 |
|
|
if (xoff < t64 + lengthXAD(xad)) {
|
| 556 |
|
|
if (xoff >= t64) {
|
| 557 |
|
|
*cmpp = 0;
|
| 558 |
|
|
goto out;
|
| 559 |
|
|
}
|
| 560 |
|
|
|
| 561 |
|
|
/* stop sequential access heuristics */
|
| 562 |
|
|
goto binarySearch;
|
| 563 |
|
|
} else { /* (t64 + lengthXAD(xad)) <= xoff */
|
| 564 |
|
|
|
| 565 |
|
|
/* try next sequential entry */
|
| 566 |
|
|
index++;
|
| 567 |
|
|
if (index <
|
| 568 |
|
|
le16_to_cpu(p->header.nextindex)) {
|
| 569 |
|
|
xad++;
|
| 570 |
|
|
t64 = offsetXAD(xad);
|
| 571 |
|
|
if (xoff < t64 + lengthXAD(xad)) {
|
| 572 |
|
|
if (xoff >= t64) {
|
| 573 |
|
|
*cmpp = 0;
|
| 574 |
|
|
goto out;
|
| 575 |
|
|
}
|
| 576 |
|
|
|
| 577 |
|
|
/* miss: key falls between
|
| 578 |
|
|
* previous and this entry
|
| 579 |
|
|
*/
|
| 580 |
|
|
*cmpp = 1;
|
| 581 |
|
|
goto out;
|
| 582 |
|
|
}
|
| 583 |
|
|
|
| 584 |
|
|
/* (xoff >= t64 + lengthXAD(xad));
|
| 585 |
|
|
* matching entry may be further out:
|
| 586 |
|
|
* stop heuristic search
|
| 587 |
|
|
*/
|
| 588 |
|
|
/* stop sequential access heuristics */
|
| 589 |
|
|
goto binarySearch;
|
| 590 |
|
|
}
|
| 591 |
|
|
|
| 592 |
|
|
/* (index == p->header.nextindex);
|
| 593 |
|
|
* miss: key entry does not exist in
|
| 594 |
|
|
* the target leaf/tree
|
| 595 |
|
|
*/
|
| 596 |
|
|
*cmpp = 1;
|
| 597 |
|
|
goto out;
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
/*
|
| 601 |
|
|
* if hit, return index of the entry found, and
|
| 602 |
|
|
* if miss, where new entry with search key is
|
| 603 |
|
|
* to be inserted;
|
| 604 |
|
|
*/
|
| 605 |
|
|
out:
|
| 606 |
|
|
/* compute number of pages to split */
|
| 607 |
|
|
if (flag & XT_INSERT) {
|
| 608 |
|
|
if (p->header.nextindex == /* little-endian */
|
| 609 |
|
|
p->header.maxentry)
|
| 610 |
|
|
nsplit++;
|
| 611 |
|
|
else
|
| 612 |
|
|
nsplit = 0;
|
| 613 |
|
|
btstack->nsplit = nsplit;
|
| 614 |
|
|
}
|
| 615 |
|
|
|
| 616 |
|
|
/* save search result */
|
| 617 |
|
|
btsp = btstack->top;
|
| 618 |
|
|
btsp->bn = bn;
|
| 619 |
|
|
btsp->index = index;
|
| 620 |
|
|
btsp->mp = mp;
|
| 621 |
|
|
|
| 622 |
|
|
/* update sequential access heuristics */
|
| 623 |
|
|
jfs_ip->btindex = index;
|
| 624 |
|
|
|
| 625 |
|
|
INCREMENT(xtStat.fastSearch);
|
| 626 |
|
|
return 0;
|
| 627 |
|
|
}
|
| 628 |
|
|
|
| 629 |
|
|
/* well, ... full search now */
|
| 630 |
|
|
binarySearch:
|
| 631 |
|
|
lim = le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
| 632 |
|
|
|
| 633 |
|
|
/*
|
| 634 |
|
|
* binary search with search key K on the current page
|
| 635 |
|
|
*/
|
| 636 |
|
|
for (base = XTENTRYSTART; lim; lim >>= 1) {
|
| 637 |
|
|
index = base + (lim >> 1);
|
| 638 |
|
|
|
| 639 |
|
|
XT_CMP(cmp, xoff, &p->xad[index], t64);
|
| 640 |
|
|
if (cmp == 0) {
|
| 641 |
|
|
/*
|
| 642 |
|
|
* search hit
|
| 643 |
|
|
*/
|
| 644 |
|
|
/* search hit - leaf page:
|
| 645 |
|
|
* return the entry found
|
| 646 |
|
|
*/
|
| 647 |
|
|
if (p->header.flag & BT_LEAF) {
|
| 648 |
|
|
*cmpp = cmp;
|
| 649 |
|
|
|
| 650 |
|
|
/* compute number of pages to split */
|
| 651 |
|
|
if (flag & XT_INSERT) {
|
| 652 |
|
|
if (p->header.nextindex ==
|
| 653 |
|
|
p->header.maxentry)
|
| 654 |
|
|
nsplit++;
|
| 655 |
|
|
else
|
| 656 |
|
|
nsplit = 0;
|
| 657 |
|
|
btstack->nsplit = nsplit;
|
| 658 |
|
|
}
|
| 659 |
|
|
|
| 660 |
|
|
/* save search result */
|
| 661 |
|
|
btsp = btstack->top;
|
| 662 |
|
|
btsp->bn = bn;
|
| 663 |
|
|
btsp->index = index;
|
| 664 |
|
|
btsp->mp = mp;
|
| 665 |
|
|
|
| 666 |
|
|
/* init sequential access heuristics */
|
| 667 |
|
|
btindex = jfs_ip->btindex;
|
| 668 |
|
|
if (index == btindex ||
|
| 669 |
|
|
index == btindex + 1)
|
| 670 |
|
|
jfs_ip->btorder = BT_SEQUENTIAL;
|
| 671 |
|
|
else
|
| 672 |
|
|
jfs_ip->btorder = BT_RANDOM;
|
| 673 |
|
|
jfs_ip->btindex = index;
|
| 674 |
|
|
|
| 675 |
|
|
return 0;
|
| 676 |
|
|
}
|
| 677 |
|
|
|
| 678 |
|
|
/* search hit - internal page:
|
| 679 |
|
|
* descend/search its child page
|
| 680 |
|
|
*/
|
| 681 |
|
|
goto next;
|
| 682 |
|
|
}
|
| 683 |
|
|
|
| 684 |
|
|
if (cmp > 0) {
|
| 685 |
|
|
base = index + 1;
|
| 686 |
|
|
--lim;
|
| 687 |
|
|
}
|
| 688 |
|
|
}
|
| 689 |
|
|
|
| 690 |
|
|
/*
|
| 691 |
|
|
* search miss
|
| 692 |
|
|
*
|
| 693 |
|
|
* base is the smallest index with key (Kj) greater than
|
| 694 |
|
|
* search key (K) and may be zero or maxentry index.
|
| 695 |
|
|
*/
|
| 696 |
|
|
/*
|
| 697 |
|
|
* search miss - leaf page:
|
| 698 |
|
|
*
|
| 699 |
|
|
* return location of entry (base) where new entry with
|
| 700 |
|
|
* search key K is to be inserted.
|
| 701 |
|
|
*/
|
| 702 |
|
|
if (p->header.flag & BT_LEAF) {
|
| 703 |
|
|
*cmpp = cmp;
|
| 704 |
|
|
|
| 705 |
|
|
/* compute number of pages to split */
|
| 706 |
|
|
if (flag & XT_INSERT) {
|
| 707 |
|
|
if (p->header.nextindex ==
|
| 708 |
|
|
p->header.maxentry)
|
| 709 |
|
|
nsplit++;
|
| 710 |
|
|
else
|
| 711 |
|
|
nsplit = 0;
|
| 712 |
|
|
btstack->nsplit = nsplit;
|
| 713 |
|
|
}
|
| 714 |
|
|
|
| 715 |
|
|
/* save search result */
|
| 716 |
|
|
btsp = btstack->top;
|
| 717 |
|
|
btsp->bn = bn;
|
| 718 |
|
|
btsp->index = base;
|
| 719 |
|
|
btsp->mp = mp;
|
| 720 |
|
|
|
| 721 |
|
|
/* init sequential access heuristics */
|
| 722 |
|
|
btindex = jfs_ip->btindex;
|
| 723 |
|
|
if (base == btindex || base == btindex + 1)
|
| 724 |
|
|
jfs_ip->btorder = BT_SEQUENTIAL;
|
| 725 |
|
|
else
|
| 726 |
|
|
jfs_ip->btorder = BT_RANDOM;
|
| 727 |
|
|
jfs_ip->btindex = base;
|
| 728 |
|
|
|
| 729 |
|
|
return 0;
|
| 730 |
|
|
}
|
| 731 |
|
|
|
| 732 |
|
|
/*
|
| 733 |
|
|
* search miss - non-leaf page:
|
| 734 |
|
|
*
|
| 735 |
|
|
* if base is non-zero, decrement base by one to get the parent
|
| 736 |
|
|
* entry of the child page to search.
|
| 737 |
|
|
*/
|
| 738 |
|
|
index = base ? base - 1 : base;
|
| 739 |
|
|
|
| 740 |
|
|
/*
|
| 741 |
|
|
* go down to child page
|
| 742 |
|
|
*/
|
| 743 |
|
|
next:
|
| 744 |
|
|
/* update number of pages to split */
|
| 745 |
|
|
if (p->header.nextindex == p->header.maxentry)
|
| 746 |
|
|
nsplit++;
|
| 747 |
|
|
else
|
| 748 |
|
|
nsplit = 0;
|
| 749 |
|
|
|
| 750 |
|
|
/* push (bn, index) of the parent page/entry */
|
| 751 |
|
|
BT_PUSH(btstack, bn, index);
|
| 752 |
|
|
|
| 753 |
|
|
/* get the child page block number */
|
| 754 |
|
|
bn = addressXAD(&p->xad[index]);
|
| 755 |
|
|
|
| 756 |
|
|
/* unpin the parent page */
|
| 757 |
|
|
XT_PUTPAGE(mp);
|
| 758 |
|
|
}
|
| 759 |
|
|
}
|
| 760 |
|
|
|
| 761 |
|
|
/*
|
| 762 |
|
|
* xtInsert()
|
| 763 |
|
|
*
|
| 764 |
|
|
* function:
|
| 765 |
|
|
*
|
| 766 |
|
|
* parameter:
|
| 767 |
|
|
* tid - transaction id;
|
| 768 |
|
|
* ip - file object;
|
| 769 |
|
|
* xflag - extent flag (XAD_NOTRECORDED):
|
| 770 |
|
|
* xoff - extent offset;
|
| 771 |
|
|
* xlen - extent length;
|
| 772 |
|
|
* xaddrp - extent address pointer (in/out):
|
| 773 |
|
|
* if (*xaddrp)
|
| 774 |
|
|
* caller allocated data extent at *xaddrp;
|
| 775 |
|
|
* else
|
| 776 |
|
|
* allocate data extent and return its xaddr;
|
| 777 |
|
|
* flag -
|
| 778 |
|
|
*
|
| 779 |
|
|
* return:
|
| 780 |
|
|
*/
|
| 781 |
|
|
int xtInsert(tid_t tid, /* transaction id */
|
| 782 |
|
|
struct inode *ip, int xflag, s64 xoff, s32 xlen, s64 * xaddrp,
|
| 783 |
|
|
int flag)
|
| 784 |
|
|
{
|
| 785 |
|
|
int rc = 0;
|
| 786 |
|
|
s64 xaddr, hint;
|
| 787 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 788 |
|
|
xtpage_t *p; /* base B+-tree index page */
|
| 789 |
|
|
s64 bn;
|
| 790 |
|
|
int index, nextindex;
|
| 791 |
|
|
struct btstack btstack; /* traverse stack */
|
| 792 |
|
|
struct xtsplit split; /* split information */
|
| 793 |
|
|
xad_t *xad;
|
| 794 |
|
|
int cmp;
|
| 795 |
|
|
struct tlock *tlck;
|
| 796 |
|
|
struct xtlock *xtlck;
|
| 797 |
|
|
|
| 798 |
|
|
jfs_info("xtInsert: nxoff:0x%lx nxlen:0x%x", (ulong) xoff, xlen);
|
| 799 |
|
|
|
| 800 |
|
|
/*
|
| 801 |
|
|
* search for the entry location at which to insert:
|
| 802 |
|
|
*
|
| 803 |
|
|
* xtFastSearch() and xtSearch() both returns (leaf page
|
| 804 |
|
|
* pinned, index at which to insert).
|
| 805 |
|
|
* n.b. xtSearch() may return index of maxentry of
|
| 806 |
|
|
* the full page.
|
| 807 |
|
|
*/
|
| 808 |
|
|
if ((rc = xtSearch(ip, xoff, &cmp, &btstack, XT_INSERT)))
|
| 809 |
|
|
return rc;
|
| 810 |
|
|
|
| 811 |
|
|
/* retrieve search result */
|
| 812 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 813 |
|
|
|
| 814 |
|
|
/* This test must follow XT_GETSEARCH since mp must be valid if
|
| 815 |
|
|
* we branch to out: */
|
| 816 |
|
|
if (cmp == 0) {
|
| 817 |
|
|
rc = -EEXIST;
|
| 818 |
|
|
goto out;
|
| 819 |
|
|
}
|
| 820 |
|
|
|
| 821 |
|
|
/*
|
| 822 |
|
|
* allocate data extent requested
|
| 823 |
|
|
*
|
| 824 |
|
|
* allocation hint: last xad
|
| 825 |
|
|
*/
|
| 826 |
|
|
if ((xaddr = *xaddrp) == 0) {
|
| 827 |
|
|
if (index > XTENTRYSTART) {
|
| 828 |
|
|
xad = &p->xad[index - 1];
|
| 829 |
|
|
hint = addressXAD(xad) + lengthXAD(xad) - 1;
|
| 830 |
|
|
} else
|
| 831 |
|
|
hint = 0;
|
| 832 |
|
|
if ((rc = dbAlloc(ip, hint, (s64) xlen, &xaddr)))
|
| 833 |
|
|
goto out;
|
| 834 |
|
|
}
|
| 835 |
|
|
|
| 836 |
|
|
/*
|
| 837 |
|
|
* insert entry for new extent
|
| 838 |
|
|
*/
|
| 839 |
|
|
xflag |= XAD_NEW;
|
| 840 |
|
|
|
| 841 |
|
|
/*
|
| 842 |
|
|
* if the leaf page is full, split the page and
|
| 843 |
|
|
* propagate up the router entry for the new page from split
|
| 844 |
|
|
*
|
| 845 |
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
| 846 |
|
|
*/
|
| 847 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 848 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 849 |
|
|
split.mp = mp;
|
| 850 |
|
|
split.index = index;
|
| 851 |
|
|
split.flag = xflag;
|
| 852 |
|
|
split.off = xoff;
|
| 853 |
|
|
split.len = xlen;
|
| 854 |
|
|
split.addr = xaddr;
|
| 855 |
|
|
split.pxdlist = NULL;
|
| 856 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack))) {
|
| 857 |
|
|
/* undo data extent allocation */
|
| 858 |
|
|
if (*xaddrp == 0)
|
| 859 |
|
|
dbFree(ip, xaddr, (s64) xlen);
|
| 860 |
|
|
return rc;
|
| 861 |
|
|
}
|
| 862 |
|
|
|
| 863 |
|
|
*xaddrp = xaddr;
|
| 864 |
|
|
return 0;
|
| 865 |
|
|
}
|
| 866 |
|
|
|
| 867 |
|
|
/*
|
| 868 |
|
|
* insert the new entry into the leaf page
|
| 869 |
|
|
*/
|
| 870 |
|
|
/*
|
| 871 |
|
|
* acquire a transaction lock on the leaf page;
|
| 872 |
|
|
*
|
| 873 |
|
|
* action: xad insertion/extension;
|
| 874 |
|
|
*/
|
| 875 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 876 |
|
|
|
| 877 |
|
|
/* if insert into middle, shift right remaining entries. */
|
| 878 |
|
|
if (index < nextindex)
|
| 879 |
|
|
memmove(&p->xad[index + 1], &p->xad[index],
|
| 880 |
|
|
(nextindex - index) * sizeof(xad_t));
|
| 881 |
|
|
|
| 882 |
|
|
/* insert the new entry: mark the entry NEW */
|
| 883 |
|
|
xad = &p->xad[index];
|
| 884 |
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
| 885 |
|
|
|
| 886 |
|
|
/* advance next available entry index */
|
| 887 |
|
|
p->header.nextindex =
|
| 888 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 889 |
|
|
|
| 890 |
|
|
/* Don't log it if there are no links to the file */
|
| 891 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 892 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 893 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 894 |
|
|
xtlck->lwm.offset =
|
| 895 |
|
|
(xtlck->lwm.offset) ? min(index,
|
| 896 |
|
|
(int)xtlck->lwm.offset) : index;
|
| 897 |
|
|
xtlck->lwm.length =
|
| 898 |
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
| 899 |
|
|
}
|
| 900 |
|
|
|
| 901 |
|
|
*xaddrp = xaddr;
|
| 902 |
|
|
|
| 903 |
|
|
out:
|
| 904 |
|
|
/* unpin the leaf page */
|
| 905 |
|
|
XT_PUTPAGE(mp);
|
| 906 |
|
|
|
| 907 |
|
|
return rc;
|
| 908 |
|
|
}
|
| 909 |
|
|
|
| 910 |
|
|
|
| 911 |
|
|
/*
|
| 912 |
|
|
* xtSplitUp()
|
| 913 |
|
|
*
|
| 914 |
|
|
* function:
|
| 915 |
|
|
* split full pages as propagating insertion up the tree
|
| 916 |
|
|
*
|
| 917 |
|
|
* parameter:
|
| 918 |
|
|
* tid - transaction id;
|
| 919 |
|
|
* ip - file object;
|
| 920 |
|
|
* split - entry parameter descriptor;
|
| 921 |
|
|
* btstack - traverse stack from xtSearch()
|
| 922 |
|
|
*
|
| 923 |
|
|
* return:
|
| 924 |
|
|
*/
|
| 925 |
|
|
static int
|
| 926 |
|
|
xtSplitUp(tid_t tid,
|
| 927 |
|
|
struct inode *ip, struct xtsplit * split, struct btstack * btstack)
|
| 928 |
|
|
{
|
| 929 |
|
|
int rc = 0;
|
| 930 |
|
|
struct metapage *smp;
|
| 931 |
|
|
xtpage_t *sp; /* split page */
|
| 932 |
|
|
struct metapage *rmp;
|
| 933 |
|
|
s64 rbn; /* new right page block number */
|
| 934 |
|
|
struct metapage *rcmp;
|
| 935 |
|
|
xtpage_t *rcp; /* right child page */
|
| 936 |
|
|
s64 rcbn; /* right child page block number */
|
| 937 |
|
|
int skip; /* index of entry of insertion */
|
| 938 |
|
|
int nextindex; /* next available entry index of p */
|
| 939 |
|
|
struct btframe *parent; /* parent page entry on traverse stack */
|
| 940 |
|
|
xad_t *xad;
|
| 941 |
|
|
s64 xaddr;
|
| 942 |
|
|
int xlen;
|
| 943 |
|
|
int nsplit; /* number of pages split */
|
| 944 |
|
|
struct pxdlist pxdlist;
|
| 945 |
|
|
pxd_t *pxd;
|
| 946 |
|
|
struct tlock *tlck;
|
| 947 |
|
|
struct xtlock *xtlck;
|
| 948 |
|
|
|
| 949 |
|
|
smp = split->mp;
|
| 950 |
|
|
sp = XT_PAGE(ip, smp);
|
| 951 |
|
|
|
| 952 |
|
|
/* is inode xtree root extension/inline EA area free ? */
|
| 953 |
|
|
if ((sp->header.flag & BT_ROOT) && (!S_ISDIR(ip->i_mode)) &&
|
| 954 |
|
|
(sp->header.maxentry < cpu_to_le16(XTROOTMAXSLOT)) &&
|
| 955 |
|
|
(JFS_IP(ip)->mode2 & INLINEEA)) {
|
| 956 |
|
|
sp->header.maxentry = cpu_to_le16(XTROOTMAXSLOT);
|
| 957 |
|
|
JFS_IP(ip)->mode2 &= ~INLINEEA;
|
| 958 |
|
|
|
| 959 |
|
|
BT_MARK_DIRTY(smp, ip);
|
| 960 |
|
|
/*
|
| 961 |
|
|
* acquire a transaction lock on the leaf page;
|
| 962 |
|
|
*
|
| 963 |
|
|
* action: xad insertion/extension;
|
| 964 |
|
|
*/
|
| 965 |
|
|
|
| 966 |
|
|
/* if insert into middle, shift right remaining entries. */
|
| 967 |
|
|
skip = split->index;
|
| 968 |
|
|
nextindex = le16_to_cpu(sp->header.nextindex);
|
| 969 |
|
|
if (skip < nextindex)
|
| 970 |
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
| 971 |
|
|
(nextindex - skip) * sizeof(xad_t));
|
| 972 |
|
|
|
| 973 |
|
|
/* insert the new entry: mark the entry NEW */
|
| 974 |
|
|
xad = &sp->xad[skip];
|
| 975 |
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
| 976 |
|
|
split->addr);
|
| 977 |
|
|
|
| 978 |
|
|
/* advance next available entry index */
|
| 979 |
|
|
sp->header.nextindex =
|
| 980 |
|
|
cpu_to_le16(le16_to_cpu(sp->header.nextindex) + 1);
|
| 981 |
|
|
|
| 982 |
|
|
/* Don't log it if there are no links to the file */
|
| 983 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 984 |
|
|
tlck = txLock(tid, ip, smp, tlckXTREE | tlckGROW);
|
| 985 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 986 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 987 |
|
|
min(skip, (int)xtlck->lwm.offset) : skip;
|
| 988 |
|
|
xtlck->lwm.length =
|
| 989 |
|
|
le16_to_cpu(sp->header.nextindex) -
|
| 990 |
|
|
xtlck->lwm.offset;
|
| 991 |
|
|
}
|
| 992 |
|
|
|
| 993 |
|
|
return 0;
|
| 994 |
|
|
}
|
| 995 |
|
|
|
| 996 |
|
|
/*
|
| 997 |
|
|
* allocate new index blocks to cover index page split(s)
|
| 998 |
|
|
*
|
| 999 |
|
|
* allocation hint: ?
|
| 1000 |
|
|
*/
|
| 1001 |
|
|
if (split->pxdlist == NULL) {
|
| 1002 |
|
|
nsplit = btstack->nsplit;
|
| 1003 |
|
|
split->pxdlist = &pxdlist;
|
| 1004 |
|
|
pxdlist.maxnpxd = pxdlist.npxd = 0;
|
| 1005 |
|
|
pxd = &pxdlist.pxd[0];
|
| 1006 |
|
|
xlen = JFS_SBI(ip->i_sb)->nbperpage;
|
| 1007 |
|
|
for (; nsplit > 0; nsplit--, pxd++) {
|
| 1008 |
|
|
if ((rc = dbAlloc(ip, (s64) 0, (s64) xlen, &xaddr))
|
| 1009 |
|
|
== 0) {
|
| 1010 |
|
|
PXDaddress(pxd, xaddr);
|
| 1011 |
|
|
PXDlength(pxd, xlen);
|
| 1012 |
|
|
|
| 1013 |
|
|
pxdlist.maxnpxd++;
|
| 1014 |
|
|
|
| 1015 |
|
|
continue;
|
| 1016 |
|
|
}
|
| 1017 |
|
|
|
| 1018 |
|
|
/* undo allocation */
|
| 1019 |
|
|
|
| 1020 |
|
|
XT_PUTPAGE(smp);
|
| 1021 |
|
|
return rc;
|
| 1022 |
|
|
}
|
| 1023 |
|
|
}
|
| 1024 |
|
|
|
| 1025 |
|
|
/*
|
| 1026 |
|
|
* Split leaf page <sp> into <sp> and a new right page <rp>.
|
| 1027 |
|
|
*
|
| 1028 |
|
|
* The split routines insert the new entry into the leaf page,
|
| 1029 |
|
|
* and acquire txLock as appropriate.
|
| 1030 |
|
|
* return <rp> pinned and its block number <rpbn>.
|
| 1031 |
|
|
*/
|
| 1032 |
|
|
rc = (sp->header.flag & BT_ROOT) ?
|
| 1033 |
|
|
xtSplitRoot(tid, ip, split, &rmp) :
|
| 1034 |
|
|
xtSplitPage(tid, ip, split, &rmp, &rbn);
|
| 1035 |
|
|
|
| 1036 |
|
|
XT_PUTPAGE(smp);
|
| 1037 |
|
|
|
| 1038 |
|
|
if (rc)
|
| 1039 |
|
|
return -EIO;
|
| 1040 |
|
|
/*
|
| 1041 |
|
|
* propagate up the router entry for the leaf page just split
|
| 1042 |
|
|
*
|
| 1043 |
|
|
* insert a router entry for the new page into the parent page,
|
| 1044 |
|
|
* propagate the insert/split up the tree by walking back the stack
|
| 1045 |
|
|
* of (bn of parent page, index of child page entry in parent page)
|
| 1046 |
|
|
* that were traversed during the search for the page that split.
|
| 1047 |
|
|
*
|
| 1048 |
|
|
* the propagation of insert/split up the tree stops if the root
|
| 1049 |
|
|
* splits or the page inserted into doesn't have to split to hold
|
| 1050 |
|
|
* the new entry.
|
| 1051 |
|
|
*
|
| 1052 |
|
|
* the parent entry for the split page remains the same, and
|
| 1053 |
|
|
* a new entry is inserted at its right with the first key and
|
| 1054 |
|
|
* block number of the new right page.
|
| 1055 |
|
|
*
|
| 1056 |
|
|
* There are a maximum of 3 pages pinned at any time:
|
| 1057 |
|
|
* right child, left parent and right parent (when the parent splits)
|
| 1058 |
|
|
* to keep the child page pinned while working on the parent.
|
| 1059 |
|
|
* make sure that all pins are released at exit.
|
| 1060 |
|
|
*/
|
| 1061 |
|
|
while ((parent = BT_POP(btstack)) != NULL) {
|
| 1062 |
|
|
/* parent page specified by stack frame <parent> */
|
| 1063 |
|
|
|
| 1064 |
|
|
/* keep current child pages <rcp> pinned */
|
| 1065 |
|
|
rcmp = rmp;
|
| 1066 |
|
|
rcbn = rbn;
|
| 1067 |
|
|
rcp = XT_PAGE(ip, rcmp);
|
| 1068 |
|
|
|
| 1069 |
|
|
/*
|
| 1070 |
|
|
* insert router entry in parent for new right child page <rp>
|
| 1071 |
|
|
*/
|
| 1072 |
|
|
/* get/pin the parent page <sp> */
|
| 1073 |
|
|
XT_GETPAGE(ip, parent->bn, smp, PSIZE, sp, rc);
|
| 1074 |
|
|
if (rc)
|
| 1075 |
|
|
goto errout2;
|
| 1076 |
|
|
|
| 1077 |
|
|
/*
|
| 1078 |
|
|
* The new key entry goes ONE AFTER the index of parent entry,
|
| 1079 |
|
|
* because the split was to the right.
|
| 1080 |
|
|
*/
|
| 1081 |
|
|
skip = parent->index + 1;
|
| 1082 |
|
|
|
| 1083 |
|
|
/*
|
| 1084 |
|
|
* split or shift right remaining entries of the parent page
|
| 1085 |
|
|
*/
|
| 1086 |
|
|
nextindex = le16_to_cpu(sp->header.nextindex);
|
| 1087 |
|
|
/*
|
| 1088 |
|
|
* parent page is full - split the parent page
|
| 1089 |
|
|
*/
|
| 1090 |
|
|
if (nextindex == le16_to_cpu(sp->header.maxentry)) {
|
| 1091 |
|
|
/* init for parent page split */
|
| 1092 |
|
|
split->mp = smp;
|
| 1093 |
|
|
split->index = skip; /* index at insert */
|
| 1094 |
|
|
split->flag = XAD_NEW;
|
| 1095 |
|
|
split->off = offsetXAD(&rcp->xad[XTENTRYSTART]);
|
| 1096 |
|
|
split->len = JFS_SBI(ip->i_sb)->nbperpage;
|
| 1097 |
|
|
split->addr = rcbn;
|
| 1098 |
|
|
|
| 1099 |
|
|
/* unpin previous right child page */
|
| 1100 |
|
|
XT_PUTPAGE(rcmp);
|
| 1101 |
|
|
|
| 1102 |
|
|
/* The split routines insert the new entry,
|
| 1103 |
|
|
* and acquire txLock as appropriate.
|
| 1104 |
|
|
* return <rp> pinned and its block number <rpbn>.
|
| 1105 |
|
|
*/
|
| 1106 |
|
|
rc = (sp->header.flag & BT_ROOT) ?
|
| 1107 |
|
|
xtSplitRoot(tid, ip, split, &rmp) :
|
| 1108 |
|
|
xtSplitPage(tid, ip, split, &rmp, &rbn);
|
| 1109 |
|
|
if (rc)
|
| 1110 |
|
|
goto errout1;
|
| 1111 |
|
|
|
| 1112 |
|
|
XT_PUTPAGE(smp);
|
| 1113 |
|
|
/* keep new child page <rp> pinned */
|
| 1114 |
|
|
}
|
| 1115 |
|
|
/*
|
| 1116 |
|
|
* parent page is not full - insert in parent page
|
| 1117 |
|
|
*/
|
| 1118 |
|
|
else {
|
| 1119 |
|
|
/*
|
| 1120 |
|
|
* insert router entry in parent for the right child
|
| 1121 |
|
|
* page from the first entry of the right child page:
|
| 1122 |
|
|
*/
|
| 1123 |
|
|
/*
|
| 1124 |
|
|
* acquire a transaction lock on the parent page;
|
| 1125 |
|
|
*
|
| 1126 |
|
|
* action: router xad insertion;
|
| 1127 |
|
|
*/
|
| 1128 |
|
|
BT_MARK_DIRTY(smp, ip);
|
| 1129 |
|
|
|
| 1130 |
|
|
/*
|
| 1131 |
|
|
* if insert into middle, shift right remaining entries
|
| 1132 |
|
|
*/
|
| 1133 |
|
|
if (skip < nextindex)
|
| 1134 |
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
| 1135 |
|
|
(nextindex -
|
| 1136 |
|
|
skip) << L2XTSLOTSIZE);
|
| 1137 |
|
|
|
| 1138 |
|
|
/* insert the router entry */
|
| 1139 |
|
|
xad = &sp->xad[skip];
|
| 1140 |
|
|
XT_PUTENTRY(xad, XAD_NEW,
|
| 1141 |
|
|
offsetXAD(&rcp->xad[XTENTRYSTART]),
|
| 1142 |
|
|
JFS_SBI(ip->i_sb)->nbperpage, rcbn);
|
| 1143 |
|
|
|
| 1144 |
|
|
/* advance next available entry index. */
|
| 1145 |
|
|
sp->header.nextindex =
|
| 1146 |
|
|
cpu_to_le16(le16_to_cpu(sp->header.nextindex) +
|
| 1147 |
|
|
1);
|
| 1148 |
|
|
|
| 1149 |
|
|
/* Don't log it if there are no links to the file */
|
| 1150 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1151 |
|
|
tlck = txLock(tid, ip, smp,
|
| 1152 |
|
|
tlckXTREE | tlckGROW);
|
| 1153 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1154 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 1155 |
|
|
min(skip, (int)xtlck->lwm.offset) : skip;
|
| 1156 |
|
|
xtlck->lwm.length =
|
| 1157 |
|
|
le16_to_cpu(sp->header.nextindex) -
|
| 1158 |
|
|
xtlck->lwm.offset;
|
| 1159 |
|
|
}
|
| 1160 |
|
|
|
| 1161 |
|
|
/* unpin parent page */
|
| 1162 |
|
|
XT_PUTPAGE(smp);
|
| 1163 |
|
|
|
| 1164 |
|
|
/* exit propagate up */
|
| 1165 |
|
|
break;
|
| 1166 |
|
|
}
|
| 1167 |
|
|
}
|
| 1168 |
|
|
|
| 1169 |
|
|
/* unpin current right page */
|
| 1170 |
|
|
XT_PUTPAGE(rmp);
|
| 1171 |
|
|
|
| 1172 |
|
|
return 0;
|
| 1173 |
|
|
|
| 1174 |
|
|
/*
|
| 1175 |
|
|
* If something fails in the above loop we were already walking back
|
| 1176 |
|
|
* up the tree and the tree is now inconsistent.
|
| 1177 |
|
|
* release all pages we're holding.
|
| 1178 |
|
|
*/
|
| 1179 |
|
|
errout1:
|
| 1180 |
|
|
XT_PUTPAGE(smp);
|
| 1181 |
|
|
|
| 1182 |
|
|
errout2:
|
| 1183 |
|
|
XT_PUTPAGE(rcmp);
|
| 1184 |
|
|
|
| 1185 |
|
|
return rc;
|
| 1186 |
|
|
}
|
| 1187 |
|
|
|
| 1188 |
|
|
|
| 1189 |
|
|
/*
|
| 1190 |
|
|
* xtSplitPage()
|
| 1191 |
|
|
*
|
| 1192 |
|
|
* function:
|
| 1193 |
|
|
* split a full non-root page into
|
| 1194 |
|
|
* original/split/left page and new right page
|
| 1195 |
|
|
* i.e., the original/split page remains as left page.
|
| 1196 |
|
|
*
|
| 1197 |
|
|
* parameter:
|
| 1198 |
|
|
* int tid,
|
| 1199 |
|
|
* struct inode *ip,
|
| 1200 |
|
|
* struct xtsplit *split,
|
| 1201 |
|
|
* struct metapage **rmpp,
|
| 1202 |
|
|
* u64 *rbnp,
|
| 1203 |
|
|
*
|
| 1204 |
|
|
* return:
|
| 1205 |
|
|
* Pointer to page in which to insert or NULL on error.
|
| 1206 |
|
|
*/
|
| 1207 |
|
|
static int
|
| 1208 |
|
|
xtSplitPage(tid_t tid, struct inode *ip,
|
| 1209 |
|
|
struct xtsplit * split, struct metapage ** rmpp, s64 * rbnp)
|
| 1210 |
|
|
{
|
| 1211 |
|
|
int rc = 0;
|
| 1212 |
|
|
struct metapage *smp;
|
| 1213 |
|
|
xtpage_t *sp;
|
| 1214 |
|
|
struct metapage *rmp;
|
| 1215 |
|
|
xtpage_t *rp; /* new right page allocated */
|
| 1216 |
|
|
s64 rbn; /* new right page block number */
|
| 1217 |
|
|
struct metapage *mp;
|
| 1218 |
|
|
xtpage_t *p;
|
| 1219 |
|
|
s64 nextbn;
|
| 1220 |
|
|
int skip, maxentry, middle, righthalf, n;
|
| 1221 |
|
|
xad_t *xad;
|
| 1222 |
|
|
struct pxdlist *pxdlist;
|
| 1223 |
|
|
pxd_t *pxd;
|
| 1224 |
|
|
struct tlock *tlck;
|
| 1225 |
|
|
struct xtlock *sxtlck = 0, *rxtlck = 0;
|
| 1226 |
|
|
|
| 1227 |
|
|
smp = split->mp;
|
| 1228 |
|
|
sp = XT_PAGE(ip, smp);
|
| 1229 |
|
|
|
| 1230 |
|
|
INCREMENT(xtStat.split);
|
| 1231 |
|
|
|
| 1232 |
|
|
/*
|
| 1233 |
|
|
* allocate the new right page for the split
|
| 1234 |
|
|
*/
|
| 1235 |
|
|
pxdlist = split->pxdlist;
|
| 1236 |
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
| 1237 |
|
|
pxdlist->npxd++;
|
| 1238 |
|
|
rbn = addressPXD(pxd);
|
| 1239 |
|
|
rmp = get_metapage(ip, rbn, PSIZE, 1);
|
| 1240 |
|
|
if (rmp == NULL)
|
| 1241 |
|
|
return -EIO;
|
| 1242 |
|
|
|
| 1243 |
|
|
jfs_info("xtSplitPage: ip:0x%p smp:0x%p rmp:0x%p", ip, smp, rmp);
|
| 1244 |
|
|
|
| 1245 |
|
|
BT_MARK_DIRTY(rmp, ip);
|
| 1246 |
|
|
/*
|
| 1247 |
|
|
* action: new page;
|
| 1248 |
|
|
*/
|
| 1249 |
|
|
|
| 1250 |
|
|
rp = (xtpage_t *) rmp->data;
|
| 1251 |
|
|
rp->header.self = *pxd;
|
| 1252 |
|
|
rp->header.flag = sp->header.flag & BT_TYPE;
|
| 1253 |
|
|
rp->header.maxentry = sp->header.maxentry; /* little-endian */
|
| 1254 |
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 1255 |
|
|
|
| 1256 |
|
|
BT_MARK_DIRTY(smp, ip);
|
| 1257 |
|
|
/* Don't log it if there are no links to the file */
|
| 1258 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1259 |
|
|
/*
|
| 1260 |
|
|
* acquire a transaction lock on the new right page;
|
| 1261 |
|
|
*/
|
| 1262 |
|
|
tlck = txLock(tid, ip, rmp, tlckXTREE | tlckNEW);
|
| 1263 |
|
|
rxtlck = (struct xtlock *) & tlck->lock;
|
| 1264 |
|
|
rxtlck->lwm.offset = XTENTRYSTART;
|
| 1265 |
|
|
/*
|
| 1266 |
|
|
* acquire a transaction lock on the split page
|
| 1267 |
|
|
*/
|
| 1268 |
|
|
tlck = txLock(tid, ip, smp, tlckXTREE | tlckGROW);
|
| 1269 |
|
|
sxtlck = (struct xtlock *) & tlck->lock;
|
| 1270 |
|
|
}
|
| 1271 |
|
|
|
| 1272 |
|
|
/*
|
| 1273 |
|
|
* initialize/update sibling pointers of <sp> and <rp>
|
| 1274 |
|
|
*/
|
| 1275 |
|
|
nextbn = le64_to_cpu(sp->header.next);
|
| 1276 |
|
|
rp->header.next = cpu_to_le64(nextbn);
|
| 1277 |
|
|
rp->header.prev = cpu_to_le64(addressPXD(&sp->header.self));
|
| 1278 |
|
|
sp->header.next = cpu_to_le64(rbn);
|
| 1279 |
|
|
|
| 1280 |
|
|
skip = split->index;
|
| 1281 |
|
|
|
| 1282 |
|
|
/*
|
| 1283 |
|
|
* sequential append at tail (after last entry of last page)
|
| 1284 |
|
|
*
|
| 1285 |
|
|
* if splitting the last page on a level because of appending
|
| 1286 |
|
|
* a entry to it (skip is maxentry), it's likely that the access is
|
| 1287 |
|
|
* sequential. adding an empty page on the side of the level is less
|
| 1288 |
|
|
* work and can push the fill factor much higher than normal.
|
| 1289 |
|
|
* if we're wrong it's no big deal - we will do the split the right
|
| 1290 |
|
|
* way next time.
|
| 1291 |
|
|
* (it may look like it's equally easy to do a similar hack for
|
| 1292 |
|
|
* reverse sorted data, that is, split the tree left, but it's not.
|
| 1293 |
|
|
* Be my guest.)
|
| 1294 |
|
|
*/
|
| 1295 |
|
|
if (nextbn == 0 && skip == le16_to_cpu(sp->header.maxentry)) {
|
| 1296 |
|
|
/*
|
| 1297 |
|
|
* acquire a transaction lock on the new/right page;
|
| 1298 |
|
|
*
|
| 1299 |
|
|
* action: xad insertion;
|
| 1300 |
|
|
*/
|
| 1301 |
|
|
/* insert entry at the first entry of the new right page */
|
| 1302 |
|
|
xad = &rp->xad[XTENTRYSTART];
|
| 1303 |
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
| 1304 |
|
|
split->addr);
|
| 1305 |
|
|
|
| 1306 |
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART + 1);
|
| 1307 |
|
|
|
| 1308 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1309 |
|
|
/* rxtlck->lwm.offset = XTENTRYSTART; */
|
| 1310 |
|
|
rxtlck->lwm.length = 1;
|
| 1311 |
|
|
}
|
| 1312 |
|
|
|
| 1313 |
|
|
*rmpp = rmp;
|
| 1314 |
|
|
*rbnp = rbn;
|
| 1315 |
|
|
|
| 1316 |
|
|
ip->i_blocks += LBLK2PBLK(ip->i_sb, lengthPXD(pxd));
|
| 1317 |
|
|
|
| 1318 |
|
|
jfs_info("xtSplitPage: sp:0x%p rp:0x%p", sp, rp);
|
| 1319 |
|
|
return 0;
|
| 1320 |
|
|
}
|
| 1321 |
|
|
|
| 1322 |
|
|
/*
|
| 1323 |
|
|
* non-sequential insert (at possibly middle page)
|
| 1324 |
|
|
*/
|
| 1325 |
|
|
|
| 1326 |
|
|
/*
|
| 1327 |
|
|
* update previous pointer of old next/right page of <sp>
|
| 1328 |
|
|
*/
|
| 1329 |
|
|
if (nextbn != 0) {
|
| 1330 |
|
|
XT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
| 1331 |
|
|
if (rc) {
|
| 1332 |
|
|
XT_PUTPAGE(rmp);
|
| 1333 |
|
|
return rc;
|
| 1334 |
|
|
}
|
| 1335 |
|
|
|
| 1336 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1337 |
|
|
/*
|
| 1338 |
|
|
* acquire a transaction lock on the next page;
|
| 1339 |
|
|
*
|
| 1340 |
|
|
* action:sibling pointer update;
|
| 1341 |
|
|
*/
|
| 1342 |
|
|
if (!test_cflag(COMMIT_Nolink, ip))
|
| 1343 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
| 1344 |
|
|
|
| 1345 |
|
|
p->header.prev = cpu_to_le64(rbn);
|
| 1346 |
|
|
|
| 1347 |
|
|
/* sibling page may have been updated previously, or
|
| 1348 |
|
|
* it may be updated later;
|
| 1349 |
|
|
*/
|
| 1350 |
|
|
|
| 1351 |
|
|
XT_PUTPAGE(mp);
|
| 1352 |
|
|
}
|
| 1353 |
|
|
|
| 1354 |
|
|
/*
|
| 1355 |
|
|
* split the data between the split and new/right pages
|
| 1356 |
|
|
*/
|
| 1357 |
|
|
maxentry = le16_to_cpu(sp->header.maxentry);
|
| 1358 |
|
|
middle = maxentry >> 1;
|
| 1359 |
|
|
righthalf = maxentry - middle;
|
| 1360 |
|
|
|
| 1361 |
|
|
/*
|
| 1362 |
|
|
* skip index in old split/left page - insert into left page:
|
| 1363 |
|
|
*/
|
| 1364 |
|
|
if (skip <= middle) {
|
| 1365 |
|
|
/* move right half of split page to the new right page */
|
| 1366 |
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[middle],
|
| 1367 |
|
|
righthalf << L2XTSLOTSIZE);
|
| 1368 |
|
|
|
| 1369 |
|
|
/* shift right tail of left half to make room for new entry */
|
| 1370 |
|
|
if (skip < middle)
|
| 1371 |
|
|
memmove(&sp->xad[skip + 1], &sp->xad[skip],
|
| 1372 |
|
|
(middle - skip) << L2XTSLOTSIZE);
|
| 1373 |
|
|
|
| 1374 |
|
|
/* insert new entry */
|
| 1375 |
|
|
xad = &sp->xad[skip];
|
| 1376 |
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
| 1377 |
|
|
split->addr);
|
| 1378 |
|
|
|
| 1379 |
|
|
/* update page header */
|
| 1380 |
|
|
sp->header.nextindex = cpu_to_le16(middle + 1);
|
| 1381 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1382 |
|
|
sxtlck->lwm.offset = (sxtlck->lwm.offset) ?
|
| 1383 |
|
|
min(skip, (int)sxtlck->lwm.offset) : skip;
|
| 1384 |
|
|
}
|
| 1385 |
|
|
|
| 1386 |
|
|
rp->header.nextindex =
|
| 1387 |
|
|
cpu_to_le16(XTENTRYSTART + righthalf);
|
| 1388 |
|
|
}
|
| 1389 |
|
|
/*
|
| 1390 |
|
|
* skip index in new right page - insert into right page:
|
| 1391 |
|
|
*/
|
| 1392 |
|
|
else {
|
| 1393 |
|
|
/* move left head of right half to right page */
|
| 1394 |
|
|
n = skip - middle;
|
| 1395 |
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[middle],
|
| 1396 |
|
|
n << L2XTSLOTSIZE);
|
| 1397 |
|
|
|
| 1398 |
|
|
/* insert new entry */
|
| 1399 |
|
|
n += XTENTRYSTART;
|
| 1400 |
|
|
xad = &rp->xad[n];
|
| 1401 |
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len,
|
| 1402 |
|
|
split->addr);
|
| 1403 |
|
|
|
| 1404 |
|
|
/* move right tail of right half to right page */
|
| 1405 |
|
|
if (skip < maxentry)
|
| 1406 |
|
|
memmove(&rp->xad[n + 1], &sp->xad[skip],
|
| 1407 |
|
|
(maxentry - skip) << L2XTSLOTSIZE);
|
| 1408 |
|
|
|
| 1409 |
|
|
/* update page header */
|
| 1410 |
|
|
sp->header.nextindex = cpu_to_le16(middle);
|
| 1411 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1412 |
|
|
sxtlck->lwm.offset = (sxtlck->lwm.offset) ?
|
| 1413 |
|
|
min(middle, (int)sxtlck->lwm.offset) : middle;
|
| 1414 |
|
|
}
|
| 1415 |
|
|
|
| 1416 |
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART +
|
| 1417 |
|
|
righthalf + 1);
|
| 1418 |
|
|
}
|
| 1419 |
|
|
|
| 1420 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1421 |
|
|
sxtlck->lwm.length = le16_to_cpu(sp->header.nextindex) -
|
| 1422 |
|
|
sxtlck->lwm.offset;
|
| 1423 |
|
|
|
| 1424 |
|
|
/* rxtlck->lwm.offset = XTENTRYSTART; */
|
| 1425 |
|
|
rxtlck->lwm.length = le16_to_cpu(rp->header.nextindex) -
|
| 1426 |
|
|
XTENTRYSTART;
|
| 1427 |
|
|
}
|
| 1428 |
|
|
|
| 1429 |
|
|
*rmpp = rmp;
|
| 1430 |
|
|
*rbnp = rbn;
|
| 1431 |
|
|
|
| 1432 |
|
|
ip->i_blocks += LBLK2PBLK(ip->i_sb, lengthPXD(pxd));
|
| 1433 |
|
|
|
| 1434 |
|
|
jfs_info("xtSplitPage: sp:0x%p rp:0x%p", sp, rp);
|
| 1435 |
|
|
return rc;
|
| 1436 |
|
|
}
|
| 1437 |
|
|
|
| 1438 |
|
|
|
| 1439 |
|
|
/*
|
| 1440 |
|
|
* xtSplitRoot()
|
| 1441 |
|
|
*
|
| 1442 |
|
|
* function:
|
| 1443 |
|
|
* split the full root page into
|
| 1444 |
|
|
* original/root/split page and new right page
|
| 1445 |
|
|
* i.e., root remains fixed in tree anchor (inode) and
|
| 1446 |
|
|
* the root is copied to a single new right child page
|
| 1447 |
|
|
* since root page << non-root page, and
|
| 1448 |
|
|
* the split root page contains a single entry for the
|
| 1449 |
|
|
* new right child page.
|
| 1450 |
|
|
*
|
| 1451 |
|
|
* parameter:
|
| 1452 |
|
|
* int tid,
|
| 1453 |
|
|
* struct inode *ip,
|
| 1454 |
|
|
* struct xtsplit *split,
|
| 1455 |
|
|
* struct metapage **rmpp)
|
| 1456 |
|
|
*
|
| 1457 |
|
|
* return:
|
| 1458 |
|
|
* Pointer to page in which to insert or NULL on error.
|
| 1459 |
|
|
*/
|
| 1460 |
|
|
static int
|
| 1461 |
|
|
xtSplitRoot(tid_t tid,
|
| 1462 |
|
|
struct inode *ip, struct xtsplit * split, struct metapage ** rmpp)
|
| 1463 |
|
|
{
|
| 1464 |
|
|
xtpage_t *sp;
|
| 1465 |
|
|
struct metapage *rmp;
|
| 1466 |
|
|
xtpage_t *rp;
|
| 1467 |
|
|
s64 rbn;
|
| 1468 |
|
|
int skip, nextindex;
|
| 1469 |
|
|
xad_t *xad;
|
| 1470 |
|
|
pxd_t *pxd;
|
| 1471 |
|
|
struct pxdlist *pxdlist;
|
| 1472 |
|
|
struct tlock *tlck;
|
| 1473 |
|
|
struct xtlock *xtlck;
|
| 1474 |
|
|
|
| 1475 |
|
|
sp = &JFS_IP(ip)->i_xtroot;
|
| 1476 |
|
|
|
| 1477 |
|
|
INCREMENT(xtStat.split);
|
| 1478 |
|
|
|
| 1479 |
|
|
/*
|
| 1480 |
|
|
* allocate a single (right) child page
|
| 1481 |
|
|
*/
|
| 1482 |
|
|
pxdlist = split->pxdlist;
|
| 1483 |
|
|
pxd = &pxdlist->pxd[pxdlist->npxd];
|
| 1484 |
|
|
pxdlist->npxd++;
|
| 1485 |
|
|
rbn = addressPXD(pxd);
|
| 1486 |
|
|
rmp = get_metapage(ip, rbn, PSIZE, 1);
|
| 1487 |
|
|
if (rmp == NULL)
|
| 1488 |
|
|
return -EIO;
|
| 1489 |
|
|
|
| 1490 |
|
|
jfs_info("xtSplitRoot: ip:0x%p rmp:0x%p", ip, rmp);
|
| 1491 |
|
|
|
| 1492 |
|
|
/*
|
| 1493 |
|
|
* acquire a transaction lock on the new right page;
|
| 1494 |
|
|
*
|
| 1495 |
|
|
* action: new page;
|
| 1496 |
|
|
*/
|
| 1497 |
|
|
BT_MARK_DIRTY(rmp, ip);
|
| 1498 |
|
|
|
| 1499 |
|
|
rp = (xtpage_t *) rmp->data;
|
| 1500 |
|
|
rp->header.flag =
|
| 1501 |
|
|
(sp->header.flag & BT_LEAF) ? BT_LEAF : BT_INTERNAL;
|
| 1502 |
|
|
rp->header.self = *pxd;
|
| 1503 |
|
|
rp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 1504 |
|
|
rp->header.maxentry = cpu_to_le16(PSIZE >> L2XTSLOTSIZE);
|
| 1505 |
|
|
|
| 1506 |
|
|
/* initialize sibling pointers */
|
| 1507 |
|
|
rp->header.next = 0;
|
| 1508 |
|
|
rp->header.prev = 0;
|
| 1509 |
|
|
|
| 1510 |
|
|
/*
|
| 1511 |
|
|
* copy the in-line root page into new right page extent
|
| 1512 |
|
|
*/
|
| 1513 |
|
|
nextindex = le16_to_cpu(sp->header.maxentry);
|
| 1514 |
|
|
memmove(&rp->xad[XTENTRYSTART], &sp->xad[XTENTRYSTART],
|
| 1515 |
|
|
(nextindex - XTENTRYSTART) << L2XTSLOTSIZE);
|
| 1516 |
|
|
|
| 1517 |
|
|
/*
|
| 1518 |
|
|
* insert the new entry into the new right/child page
|
| 1519 |
|
|
* (skip index in the new right page will not change)
|
| 1520 |
|
|
*/
|
| 1521 |
|
|
skip = split->index;
|
| 1522 |
|
|
/* if insert into middle, shift right remaining entries */
|
| 1523 |
|
|
if (skip != nextindex)
|
| 1524 |
|
|
memmove(&rp->xad[skip + 1], &rp->xad[skip],
|
| 1525 |
|
|
(nextindex - skip) * sizeof(xad_t));
|
| 1526 |
|
|
|
| 1527 |
|
|
xad = &rp->xad[skip];
|
| 1528 |
|
|
XT_PUTENTRY(xad, split->flag, split->off, split->len, split->addr);
|
| 1529 |
|
|
|
| 1530 |
|
|
/* update page header */
|
| 1531 |
|
|
rp->header.nextindex = cpu_to_le16(nextindex + 1);
|
| 1532 |
|
|
|
| 1533 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1534 |
|
|
tlck = txLock(tid, ip, rmp, tlckXTREE | tlckNEW);
|
| 1535 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1536 |
|
|
xtlck->lwm.offset = XTENTRYSTART;
|
| 1537 |
|
|
xtlck->lwm.length = le16_to_cpu(rp->header.nextindex) -
|
| 1538 |
|
|
XTENTRYSTART;
|
| 1539 |
|
|
}
|
| 1540 |
|
|
|
| 1541 |
|
|
/*
|
| 1542 |
|
|
* reset the root
|
| 1543 |
|
|
*
|
| 1544 |
|
|
* init root with the single entry for the new right page
|
| 1545 |
|
|
* set the 1st entry offset to 0, which force the left-most key
|
| 1546 |
|
|
* at any level of the tree to be less than any search key.
|
| 1547 |
|
|
*/
|
| 1548 |
|
|
/*
|
| 1549 |
|
|
* acquire a transaction lock on the root page (in-memory inode);
|
| 1550 |
|
|
*
|
| 1551 |
|
|
* action: root split;
|
| 1552 |
|
|
*/
|
| 1553 |
|
|
BT_MARK_DIRTY(split->mp, ip);
|
| 1554 |
|
|
|
| 1555 |
|
|
xad = &sp->xad[XTENTRYSTART];
|
| 1556 |
|
|
XT_PUTENTRY(xad, XAD_NEW, 0, JFS_SBI(ip->i_sb)->nbperpage, rbn);
|
| 1557 |
|
|
|
| 1558 |
|
|
/* update page header of root */
|
| 1559 |
|
|
sp->header.flag &= ~BT_LEAF;
|
| 1560 |
|
|
sp->header.flag |= BT_INTERNAL;
|
| 1561 |
|
|
|
| 1562 |
|
|
sp->header.nextindex = cpu_to_le16(XTENTRYSTART + 1);
|
| 1563 |
|
|
|
| 1564 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1565 |
|
|
tlck = txLock(tid, ip, split->mp, tlckXTREE | tlckGROW);
|
| 1566 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1567 |
|
|
xtlck->lwm.offset = XTENTRYSTART;
|
| 1568 |
|
|
xtlck->lwm.length = 1;
|
| 1569 |
|
|
}
|
| 1570 |
|
|
|
| 1571 |
|
|
*rmpp = rmp;
|
| 1572 |
|
|
|
| 1573 |
|
|
ip->i_blocks += LBLK2PBLK(ip->i_sb, lengthPXD(pxd));
|
| 1574 |
|
|
|
| 1575 |
|
|
jfs_info("xtSplitRoot: sp:0x%p rp:0x%p", sp, rp);
|
| 1576 |
|
|
return 0;
|
| 1577 |
|
|
}
|
| 1578 |
|
|
|
| 1579 |
|
|
|
| 1580 |
|
|
/*
|
| 1581 |
|
|
* xtExtend()
|
| 1582 |
|
|
*
|
| 1583 |
|
|
* function: extend in-place;
|
| 1584 |
|
|
*
|
| 1585 |
|
|
* note: existing extent may or may not have been committed.
|
| 1586 |
|
|
* caller is responsible for pager buffer cache update, and
|
| 1587 |
|
|
* working block allocation map update;
|
| 1588 |
|
|
* update pmap: alloc whole extended extent;
|
| 1589 |
|
|
*/
|
| 1590 |
|
|
int xtExtend(tid_t tid, /* transaction id */
|
| 1591 |
|
|
struct inode *ip, s64 xoff, /* delta extent offset */
|
| 1592 |
|
|
s32 xlen, /* delta extent length */
|
| 1593 |
|
|
int flag)
|
| 1594 |
|
|
{
|
| 1595 |
|
|
int rc = 0;
|
| 1596 |
|
|
int cmp;
|
| 1597 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 1598 |
|
|
xtpage_t *p; /* base B+-tree index page */
|
| 1599 |
|
|
s64 bn;
|
| 1600 |
|
|
int index, nextindex, len;
|
| 1601 |
|
|
struct btstack btstack; /* traverse stack */
|
| 1602 |
|
|
struct xtsplit split; /* split information */
|
| 1603 |
|
|
xad_t *xad;
|
| 1604 |
|
|
s64 xaddr;
|
| 1605 |
|
|
struct tlock *tlck;
|
| 1606 |
|
|
struct xtlock *xtlck = 0;
|
| 1607 |
|
|
int rootsplit = 0;
|
| 1608 |
|
|
|
| 1609 |
|
|
jfs_info("xtExtend: nxoff:0x%lx nxlen:0x%x", (ulong) xoff, xlen);
|
| 1610 |
|
|
|
| 1611 |
|
|
/* there must exist extent to be extended */
|
| 1612 |
|
|
if ((rc = xtSearch(ip, xoff - 1, &cmp, &btstack, XT_INSERT)))
|
| 1613 |
|
|
return rc;
|
| 1614 |
|
|
|
| 1615 |
|
|
/* retrieve search result */
|
| 1616 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 1617 |
|
|
|
| 1618 |
|
|
if (cmp != 0) {
|
| 1619 |
|
|
XT_PUTPAGE(mp);
|
| 1620 |
|
|
jfs_error(ip->i_sb, "xtExtend: xtSearch did not find extent");
|
| 1621 |
|
|
return -EIO;
|
| 1622 |
|
|
}
|
| 1623 |
|
|
|
| 1624 |
|
|
/* extension must be contiguous */
|
| 1625 |
|
|
xad = &p->xad[index];
|
| 1626 |
|
|
if ((offsetXAD(xad) + lengthXAD(xad)) != xoff) {
|
| 1627 |
|
|
XT_PUTPAGE(mp);
|
| 1628 |
|
|
jfs_error(ip->i_sb, "xtExtend: extension is not contiguous");
|
| 1629 |
|
|
return -EIO;
|
| 1630 |
|
|
}
|
| 1631 |
|
|
|
| 1632 |
|
|
/*
|
| 1633 |
|
|
* acquire a transaction lock on the leaf page;
|
| 1634 |
|
|
*
|
| 1635 |
|
|
* action: xad insertion/extension;
|
| 1636 |
|
|
*/
|
| 1637 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1638 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1639 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 1640 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1641 |
|
|
}
|
| 1642 |
|
|
|
| 1643 |
|
|
/* extend will overflow extent ? */
|
| 1644 |
|
|
xlen = lengthXAD(xad) + xlen;
|
| 1645 |
|
|
if ((len = xlen - MAXXLEN) <= 0)
|
| 1646 |
|
|
goto extendOld;
|
| 1647 |
|
|
|
| 1648 |
|
|
/*
|
| 1649 |
|
|
* extent overflow: insert entry for new extent
|
| 1650 |
|
|
*/
|
| 1651 |
|
|
//insertNew:
|
| 1652 |
|
|
xoff = offsetXAD(xad) + MAXXLEN;
|
| 1653 |
|
|
xaddr = addressXAD(xad) + MAXXLEN;
|
| 1654 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 1655 |
|
|
|
| 1656 |
|
|
/*
|
| 1657 |
|
|
* if the leaf page is full, insert the new entry and
|
| 1658 |
|
|
* propagate up the router entry for the new page from split
|
| 1659 |
|
|
*
|
| 1660 |
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
| 1661 |
|
|
*/
|
| 1662 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 1663 |
|
|
rootsplit = p->header.flag & BT_ROOT;
|
| 1664 |
|
|
|
| 1665 |
|
|
/* xtSpliUp() unpins leaf pages */
|
| 1666 |
|
|
split.mp = mp;
|
| 1667 |
|
|
split.index = index + 1;
|
| 1668 |
|
|
split.flag = XAD_NEW;
|
| 1669 |
|
|
split.off = xoff; /* split offset */
|
| 1670 |
|
|
split.len = len;
|
| 1671 |
|
|
split.addr = xaddr;
|
| 1672 |
|
|
split.pxdlist = NULL;
|
| 1673 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
| 1674 |
|
|
return rc;
|
| 1675 |
|
|
|
| 1676 |
|
|
/*
|
| 1677 |
|
|
* if leaf root has been split, original root has been
|
| 1678 |
|
|
* copied to new child page, i.e., original entry now
|
| 1679 |
|
|
* resides on the new child page;
|
| 1680 |
|
|
*/
|
| 1681 |
|
|
if (rootsplit) {
|
| 1682 |
|
|
ASSERT(p->header.nextindex ==
|
| 1683 |
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
| 1684 |
|
|
xad = &p->xad[XTENTRYSTART];
|
| 1685 |
|
|
bn = addressXAD(xad);
|
| 1686 |
|
|
|
| 1687 |
|
|
/* get new child page */
|
| 1688 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 1689 |
|
|
if (rc)
|
| 1690 |
|
|
return rc;
|
| 1691 |
|
|
|
| 1692 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1693 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1694 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
| 1695 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1696 |
|
|
}
|
| 1697 |
|
|
} else {
|
| 1698 |
|
|
/* get back old page */
|
| 1699 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 1700 |
|
|
if (rc)
|
| 1701 |
|
|
return rc;
|
| 1702 |
|
|
}
|
| 1703 |
|
|
}
|
| 1704 |
|
|
/*
|
| 1705 |
|
|
* insert the new entry into the leaf page
|
| 1706 |
|
|
*/
|
| 1707 |
|
|
else {
|
| 1708 |
|
|
/* insert the new entry: mark the entry NEW */
|
| 1709 |
|
|
xad = &p->xad[index + 1];
|
| 1710 |
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, len, xaddr);
|
| 1711 |
|
|
|
| 1712 |
|
|
/* advance next available entry index */
|
| 1713 |
|
|
p->header.nextindex =
|
| 1714 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 1715 |
|
|
}
|
| 1716 |
|
|
|
| 1717 |
|
|
/* get back old entry */
|
| 1718 |
|
|
xad = &p->xad[index];
|
| 1719 |
|
|
xlen = MAXXLEN;
|
| 1720 |
|
|
|
| 1721 |
|
|
/*
|
| 1722 |
|
|
* extend old extent
|
| 1723 |
|
|
*/
|
| 1724 |
|
|
extendOld:
|
| 1725 |
|
|
XADlength(xad, xlen);
|
| 1726 |
|
|
if (!(xad->flag & XAD_NEW))
|
| 1727 |
|
|
xad->flag |= XAD_EXTENDED;
|
| 1728 |
|
|
|
| 1729 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1730 |
|
|
xtlck->lwm.offset =
|
| 1731 |
|
|
(xtlck->lwm.offset) ? min(index,
|
| 1732 |
|
|
(int)xtlck->lwm.offset) : index;
|
| 1733 |
|
|
xtlck->lwm.length =
|
| 1734 |
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
| 1735 |
|
|
}
|
| 1736 |
|
|
|
| 1737 |
|
|
/* unpin the leaf page */
|
| 1738 |
|
|
XT_PUTPAGE(mp);
|
| 1739 |
|
|
|
| 1740 |
|
|
return rc;
|
| 1741 |
|
|
}
|
| 1742 |
|
|
|
| 1743 |
|
|
#ifdef _NOTYET
|
| 1744 |
|
|
/*
|
| 1745 |
|
|
* xtTailgate()
|
| 1746 |
|
|
*
|
| 1747 |
|
|
* function: split existing 'tail' extent
|
| 1748 |
|
|
* (split offset >= start offset of tail extent), and
|
| 1749 |
|
|
* relocate and extend the split tail half;
|
| 1750 |
|
|
*
|
| 1751 |
|
|
* note: existing extent may or may not have been committed.
|
| 1752 |
|
|
* caller is responsible for pager buffer cache update, and
|
| 1753 |
|
|
* working block allocation map update;
|
| 1754 |
|
|
* update pmap: free old split tail extent, alloc new extent;
|
| 1755 |
|
|
*/
|
| 1756 |
|
|
int xtTailgate(tid_t tid, /* transaction id */
|
| 1757 |
|
|
struct inode *ip, s64 xoff, /* split/new extent offset */
|
| 1758 |
|
|
s32 xlen, /* new extent length */
|
| 1759 |
|
|
s64 xaddr, /* new extent address */
|
| 1760 |
|
|
int flag)
|
| 1761 |
|
|
{
|
| 1762 |
|
|
int rc = 0;
|
| 1763 |
|
|
int cmp;
|
| 1764 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 1765 |
|
|
xtpage_t *p; /* base B+-tree index page */
|
| 1766 |
|
|
s64 bn;
|
| 1767 |
|
|
int index, nextindex, llen, rlen;
|
| 1768 |
|
|
struct btstack btstack; /* traverse stack */
|
| 1769 |
|
|
struct xtsplit split; /* split information */
|
| 1770 |
|
|
xad_t *xad;
|
| 1771 |
|
|
struct tlock *tlck;
|
| 1772 |
|
|
struct xtlock *xtlck = 0;
|
| 1773 |
|
|
struct tlock *mtlck;
|
| 1774 |
|
|
struct maplock *pxdlock;
|
| 1775 |
|
|
int rootsplit = 0;
|
| 1776 |
|
|
|
| 1777 |
|
|
/*
|
| 1778 |
|
|
printf("xtTailgate: nxoff:0x%lx nxlen:0x%x nxaddr:0x%lx\n",
|
| 1779 |
|
|
(ulong)xoff, xlen, (ulong)xaddr);
|
| 1780 |
|
|
*/
|
| 1781 |
|
|
|
| 1782 |
|
|
/* there must exist extent to be tailgated */
|
| 1783 |
|
|
if ((rc = xtSearch(ip, xoff, &cmp, &btstack, XT_INSERT)))
|
| 1784 |
|
|
return rc;
|
| 1785 |
|
|
|
| 1786 |
|
|
/* retrieve search result */
|
| 1787 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 1788 |
|
|
|
| 1789 |
|
|
if (cmp != 0) {
|
| 1790 |
|
|
XT_PUTPAGE(mp);
|
| 1791 |
|
|
jfs_error(ip->i_sb, "xtTailgate: couldn't find extent");
|
| 1792 |
|
|
return -EIO;
|
| 1793 |
|
|
}
|
| 1794 |
|
|
|
| 1795 |
|
|
/* entry found must be last entry */
|
| 1796 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 1797 |
|
|
if (index != nextindex - 1) {
|
| 1798 |
|
|
XT_PUTPAGE(mp);
|
| 1799 |
|
|
jfs_error(ip->i_sb,
|
| 1800 |
|
|
"xtTailgate: the entry found is not the last entry");
|
| 1801 |
|
|
return -EIO;
|
| 1802 |
|
|
}
|
| 1803 |
|
|
|
| 1804 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1805 |
|
|
/*
|
| 1806 |
|
|
* acquire tlock of the leaf page containing original entry
|
| 1807 |
|
|
*/
|
| 1808 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1809 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 1810 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1811 |
|
|
}
|
| 1812 |
|
|
|
| 1813 |
|
|
/* completely replace extent ? */
|
| 1814 |
|
|
xad = &p->xad[index];
|
| 1815 |
|
|
/*
|
| 1816 |
|
|
printf("xtTailgate: xoff:0x%lx xlen:0x%x xaddr:0x%lx\n",
|
| 1817 |
|
|
(ulong)offsetXAD(xad), lengthXAD(xad), (ulong)addressXAD(xad));
|
| 1818 |
|
|
*/
|
| 1819 |
|
|
if ((llen = xoff - offsetXAD(xad)) == 0)
|
| 1820 |
|
|
goto updateOld;
|
| 1821 |
|
|
|
| 1822 |
|
|
/*
|
| 1823 |
|
|
* partially replace extent: insert entry for new extent
|
| 1824 |
|
|
*/
|
| 1825 |
|
|
//insertNew:
|
| 1826 |
|
|
/*
|
| 1827 |
|
|
* if the leaf page is full, insert the new entry and
|
| 1828 |
|
|
* propagate up the router entry for the new page from split
|
| 1829 |
|
|
*
|
| 1830 |
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
| 1831 |
|
|
*/
|
| 1832 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 1833 |
|
|
rootsplit = p->header.flag & BT_ROOT;
|
| 1834 |
|
|
|
| 1835 |
|
|
/* xtSpliUp() unpins leaf pages */
|
| 1836 |
|
|
split.mp = mp;
|
| 1837 |
|
|
split.index = index + 1;
|
| 1838 |
|
|
split.flag = XAD_NEW;
|
| 1839 |
|
|
split.off = xoff; /* split offset */
|
| 1840 |
|
|
split.len = xlen;
|
| 1841 |
|
|
split.addr = xaddr;
|
| 1842 |
|
|
split.pxdlist = NULL;
|
| 1843 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
| 1844 |
|
|
return rc;
|
| 1845 |
|
|
|
| 1846 |
|
|
/*
|
| 1847 |
|
|
* if leaf root has been split, original root has been
|
| 1848 |
|
|
* copied to new child page, i.e., original entry now
|
| 1849 |
|
|
* resides on the new child page;
|
| 1850 |
|
|
*/
|
| 1851 |
|
|
if (rootsplit) {
|
| 1852 |
|
|
ASSERT(p->header.nextindex ==
|
| 1853 |
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
| 1854 |
|
|
xad = &p->xad[XTENTRYSTART];
|
| 1855 |
|
|
bn = addressXAD(xad);
|
| 1856 |
|
|
|
| 1857 |
|
|
/* get new child page */
|
| 1858 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 1859 |
|
|
if (rc)
|
| 1860 |
|
|
return rc;
|
| 1861 |
|
|
|
| 1862 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1863 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1864 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
| 1865 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1866 |
|
|
}
|
| 1867 |
|
|
} else {
|
| 1868 |
|
|
/* get back old page */
|
| 1869 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 1870 |
|
|
if (rc)
|
| 1871 |
|
|
return rc;
|
| 1872 |
|
|
}
|
| 1873 |
|
|
}
|
| 1874 |
|
|
/*
|
| 1875 |
|
|
* insert the new entry into the leaf page
|
| 1876 |
|
|
*/
|
| 1877 |
|
|
else {
|
| 1878 |
|
|
/* insert the new entry: mark the entry NEW */
|
| 1879 |
|
|
xad = &p->xad[index + 1];
|
| 1880 |
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, xlen, xaddr);
|
| 1881 |
|
|
|
| 1882 |
|
|
/* advance next available entry index */
|
| 1883 |
|
|
p->header.nextindex =
|
| 1884 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 1885 |
|
|
}
|
| 1886 |
|
|
|
| 1887 |
|
|
/* get back old XAD */
|
| 1888 |
|
|
xad = &p->xad[index];
|
| 1889 |
|
|
|
| 1890 |
|
|
/*
|
| 1891 |
|
|
* truncate/relocate old extent at split offset
|
| 1892 |
|
|
*/
|
| 1893 |
|
|
updateOld:
|
| 1894 |
|
|
/* update dmap for old/committed/truncated extent */
|
| 1895 |
|
|
rlen = lengthXAD(xad) - llen;
|
| 1896 |
|
|
if (!(xad->flag & XAD_NEW)) {
|
| 1897 |
|
|
/* free from PWMAP at commit */
|
| 1898 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1899 |
|
|
mtlck = txMaplock(tid, ip, tlckMAP);
|
| 1900 |
|
|
pxdlock = (struct maplock *) & mtlck->lock;
|
| 1901 |
|
|
pxdlock->flag = mlckFREEPXD;
|
| 1902 |
|
|
PXDaddress(&pxdlock->pxd, addressXAD(xad) + llen);
|
| 1903 |
|
|
PXDlength(&pxdlock->pxd, rlen);
|
| 1904 |
|
|
pxdlock->index = 1;
|
| 1905 |
|
|
}
|
| 1906 |
|
|
} else
|
| 1907 |
|
|
/* free from WMAP */
|
| 1908 |
|
|
dbFree(ip, addressXAD(xad) + llen, (s64) rlen);
|
| 1909 |
|
|
|
| 1910 |
|
|
if (llen)
|
| 1911 |
|
|
/* truncate */
|
| 1912 |
|
|
XADlength(xad, llen);
|
| 1913 |
|
|
else
|
| 1914 |
|
|
/* replace */
|
| 1915 |
|
|
XT_PUTENTRY(xad, XAD_NEW, xoff, xlen, xaddr);
|
| 1916 |
|
|
|
| 1917 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1918 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 1919 |
|
|
min(index, (int)xtlck->lwm.offset) : index;
|
| 1920 |
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
| 1921 |
|
|
xtlck->lwm.offset;
|
| 1922 |
|
|
}
|
| 1923 |
|
|
|
| 1924 |
|
|
/* unpin the leaf page */
|
| 1925 |
|
|
XT_PUTPAGE(mp);
|
| 1926 |
|
|
|
| 1927 |
|
|
return rc;
|
| 1928 |
|
|
}
|
| 1929 |
|
|
#endif /* _NOTYET */
|
| 1930 |
|
|
|
| 1931 |
|
|
/*
|
| 1932 |
|
|
* xtUpdate()
|
| 1933 |
|
|
*
|
| 1934 |
|
|
* function: update XAD;
|
| 1935 |
|
|
*
|
| 1936 |
|
|
* update extent for allocated_but_not_recorded or
|
| 1937 |
|
|
* compressed extent;
|
| 1938 |
|
|
*
|
| 1939 |
|
|
* parameter:
|
| 1940 |
|
|
* nxad - new XAD;
|
| 1941 |
|
|
* logical extent of the specified XAD must be completely
|
| 1942 |
|
|
* contained by an existing XAD;
|
| 1943 |
|
|
*/
|
| 1944 |
|
|
int xtUpdate(tid_t tid, struct inode *ip, xad_t * nxad)
|
| 1945 |
|
|
{ /* new XAD */
|
| 1946 |
|
|
int rc = 0;
|
| 1947 |
|
|
int cmp;
|
| 1948 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 1949 |
|
|
xtpage_t *p; /* base B+-tree index page */
|
| 1950 |
|
|
s64 bn;
|
| 1951 |
|
|
int index0, index, newindex, nextindex;
|
| 1952 |
|
|
struct btstack btstack; /* traverse stack */
|
| 1953 |
|
|
struct xtsplit split; /* split information */
|
| 1954 |
|
|
xad_t *xad, *lxad, *rxad;
|
| 1955 |
|
|
int xflag;
|
| 1956 |
|
|
s64 nxoff, xoff;
|
| 1957 |
|
|
int nxlen, xlen, lxlen, rxlen;
|
| 1958 |
|
|
s64 nxaddr, xaddr;
|
| 1959 |
|
|
struct tlock *tlck;
|
| 1960 |
|
|
struct xtlock *xtlck = 0;
|
| 1961 |
|
|
int rootsplit = 0, newpage = 0;
|
| 1962 |
|
|
|
| 1963 |
|
|
/* there must exist extent to be tailgated */
|
| 1964 |
|
|
nxoff = offsetXAD(nxad);
|
| 1965 |
|
|
nxlen = lengthXAD(nxad);
|
| 1966 |
|
|
nxaddr = addressXAD(nxad);
|
| 1967 |
|
|
|
| 1968 |
|
|
if ((rc = xtSearch(ip, nxoff, &cmp, &btstack, XT_INSERT)))
|
| 1969 |
|
|
return rc;
|
| 1970 |
|
|
|
| 1971 |
|
|
/* retrieve search result */
|
| 1972 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index0);
|
| 1973 |
|
|
|
| 1974 |
|
|
if (cmp != 0) {
|
| 1975 |
|
|
XT_PUTPAGE(mp);
|
| 1976 |
|
|
jfs_error(ip->i_sb, "xtUpdate: Could not find extent");
|
| 1977 |
|
|
return -EIO;
|
| 1978 |
|
|
}
|
| 1979 |
|
|
|
| 1980 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 1981 |
|
|
/*
|
| 1982 |
|
|
* acquire tlock of the leaf page containing original entry
|
| 1983 |
|
|
*/
|
| 1984 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 1985 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 1986 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 1987 |
|
|
}
|
| 1988 |
|
|
|
| 1989 |
|
|
xad = &p->xad[index0];
|
| 1990 |
|
|
xflag = xad->flag;
|
| 1991 |
|
|
xoff = offsetXAD(xad);
|
| 1992 |
|
|
xlen = lengthXAD(xad);
|
| 1993 |
|
|
xaddr = addressXAD(xad);
|
| 1994 |
|
|
|
| 1995 |
|
|
/* nXAD must be completely contained within XAD */
|
| 1996 |
|
|
if ((xoff > nxoff) ||
|
| 1997 |
|
|
(nxoff + nxlen > xoff + xlen)) {
|
| 1998 |
|
|
XT_PUTPAGE(mp);
|
| 1999 |
|
|
jfs_error(ip->i_sb,
|
| 2000 |
|
|
"xtUpdate: nXAD in not completely contained within XAD");
|
| 2001 |
|
|
return -EIO;
|
| 2002 |
|
|
}
|
| 2003 |
|
|
|
| 2004 |
|
|
index = index0;
|
| 2005 |
|
|
newindex = index + 1;
|
| 2006 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2007 |
|
|
|
| 2008 |
|
|
#ifdef _JFS_WIP_NOCOALESCE
|
| 2009 |
|
|
if (xoff < nxoff)
|
| 2010 |
|
|
goto updateRight;
|
| 2011 |
|
|
|
| 2012 |
|
|
/*
|
| 2013 |
|
|
* replace XAD with nXAD
|
| 2014 |
|
|
*/
|
| 2015 |
|
|
replace: /* (nxoff == xoff) */
|
| 2016 |
|
|
if (nxlen == xlen) {
|
| 2017 |
|
|
/* replace XAD with nXAD:recorded */
|
| 2018 |
|
|
*xad = *nxad;
|
| 2019 |
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
| 2020 |
|
|
|
| 2021 |
|
|
goto out;
|
| 2022 |
|
|
} else /* (nxlen < xlen) */
|
| 2023 |
|
|
goto updateLeft;
|
| 2024 |
|
|
#endif /* _JFS_WIP_NOCOALESCE */
|
| 2025 |
|
|
|
| 2026 |
|
|
/* #ifdef _JFS_WIP_COALESCE */
|
| 2027 |
|
|
if (xoff < nxoff)
|
| 2028 |
|
|
goto coalesceRight;
|
| 2029 |
|
|
|
| 2030 |
|
|
/*
|
| 2031 |
|
|
* coalesce with left XAD
|
| 2032 |
|
|
*/
|
| 2033 |
|
|
//coalesceLeft: /* (xoff == nxoff) */
|
| 2034 |
|
|
/* is XAD first entry of page ? */
|
| 2035 |
|
|
if (index == XTENTRYSTART)
|
| 2036 |
|
|
goto replace;
|
| 2037 |
|
|
|
| 2038 |
|
|
/* is nXAD logically and physically contiguous with lXAD ? */
|
| 2039 |
|
|
lxad = &p->xad[index - 1];
|
| 2040 |
|
|
lxlen = lengthXAD(lxad);
|
| 2041 |
|
|
if (!(lxad->flag & XAD_NOTRECORDED) &&
|
| 2042 |
|
|
(nxoff == offsetXAD(lxad) + lxlen) &&
|
| 2043 |
|
|
(nxaddr == addressXAD(lxad) + lxlen) &&
|
| 2044 |
|
|
(lxlen + nxlen < MAXXLEN)) {
|
| 2045 |
|
|
/* extend right lXAD */
|
| 2046 |
|
|
index0 = index - 1;
|
| 2047 |
|
|
XADlength(lxad, lxlen + nxlen);
|
| 2048 |
|
|
|
| 2049 |
|
|
/* If we just merged two extents together, need to make sure the
|
| 2050 |
|
|
* right extent gets logged. If the left one is marked XAD_NEW,
|
| 2051 |
|
|
* then we know it will be logged. Otherwise, mark as
|
| 2052 |
|
|
* XAD_EXTENDED
|
| 2053 |
|
|
*/
|
| 2054 |
|
|
if (!(lxad->flag & XAD_NEW))
|
| 2055 |
|
|
lxad->flag |= XAD_EXTENDED;
|
| 2056 |
|
|
|
| 2057 |
|
|
if (xlen > nxlen) {
|
| 2058 |
|
|
/* truncate XAD */
|
| 2059 |
|
|
XADoffset(xad, xoff + nxlen);
|
| 2060 |
|
|
XADlength(xad, xlen - nxlen);
|
| 2061 |
|
|
XADaddress(xad, xaddr + nxlen);
|
| 2062 |
|
|
goto out;
|
| 2063 |
|
|
} else { /* (xlen == nxlen) */
|
| 2064 |
|
|
|
| 2065 |
|
|
/* remove XAD */
|
| 2066 |
|
|
if (index < nextindex - 1)
|
| 2067 |
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
| 2068 |
|
|
(nextindex - index -
|
| 2069 |
|
|
1) << L2XTSLOTSIZE);
|
| 2070 |
|
|
|
| 2071 |
|
|
p->header.nextindex =
|
| 2072 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
| 2073 |
|
|
1);
|
| 2074 |
|
|
|
| 2075 |
|
|
index = index0;
|
| 2076 |
|
|
newindex = index + 1;
|
| 2077 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2078 |
|
|
xoff = nxoff = offsetXAD(lxad);
|
| 2079 |
|
|
xlen = nxlen = lxlen + nxlen;
|
| 2080 |
|
|
xaddr = nxaddr = addressXAD(lxad);
|
| 2081 |
|
|
goto coalesceRight;
|
| 2082 |
|
|
}
|
| 2083 |
|
|
}
|
| 2084 |
|
|
|
| 2085 |
|
|
/*
|
| 2086 |
|
|
* replace XAD with nXAD
|
| 2087 |
|
|
*/
|
| 2088 |
|
|
replace: /* (nxoff == xoff) */
|
| 2089 |
|
|
if (nxlen == xlen) {
|
| 2090 |
|
|
/* replace XAD with nXAD:recorded */
|
| 2091 |
|
|
*xad = *nxad;
|
| 2092 |
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
| 2093 |
|
|
|
| 2094 |
|
|
goto coalesceRight;
|
| 2095 |
|
|
} else /* (nxlen < xlen) */
|
| 2096 |
|
|
goto updateLeft;
|
| 2097 |
|
|
|
| 2098 |
|
|
/*
|
| 2099 |
|
|
* coalesce with right XAD
|
| 2100 |
|
|
*/
|
| 2101 |
|
|
coalesceRight: /* (xoff <= nxoff) */
|
| 2102 |
|
|
/* is XAD last entry of page ? */
|
| 2103 |
|
|
if (newindex == nextindex) {
|
| 2104 |
|
|
if (xoff == nxoff)
|
| 2105 |
|
|
goto out;
|
| 2106 |
|
|
goto updateRight;
|
| 2107 |
|
|
}
|
| 2108 |
|
|
|
| 2109 |
|
|
/* is nXAD logically and physically contiguous with rXAD ? */
|
| 2110 |
|
|
rxad = &p->xad[index + 1];
|
| 2111 |
|
|
rxlen = lengthXAD(rxad);
|
| 2112 |
|
|
if (!(rxad->flag & XAD_NOTRECORDED) &&
|
| 2113 |
|
|
(nxoff + nxlen == offsetXAD(rxad)) &&
|
| 2114 |
|
|
(nxaddr + nxlen == addressXAD(rxad)) &&
|
| 2115 |
|
|
(rxlen + nxlen < MAXXLEN)) {
|
| 2116 |
|
|
/* extend left rXAD */
|
| 2117 |
|
|
XADoffset(rxad, nxoff);
|
| 2118 |
|
|
XADlength(rxad, rxlen + nxlen);
|
| 2119 |
|
|
XADaddress(rxad, nxaddr);
|
| 2120 |
|
|
|
| 2121 |
|
|
/* If we just merged two extents together, need to make sure
|
| 2122 |
|
|
* the left extent gets logged. If the right one is marked
|
| 2123 |
|
|
* XAD_NEW, then we know it will be logged. Otherwise, mark as
|
| 2124 |
|
|
* XAD_EXTENDED
|
| 2125 |
|
|
*/
|
| 2126 |
|
|
if (!(rxad->flag & XAD_NEW))
|
| 2127 |
|
|
rxad->flag |= XAD_EXTENDED;
|
| 2128 |
|
|
|
| 2129 |
|
|
if (xlen > nxlen)
|
| 2130 |
|
|
/* truncate XAD */
|
| 2131 |
|
|
XADlength(xad, xlen - nxlen);
|
| 2132 |
|
|
else { /* (xlen == nxlen) */
|
| 2133 |
|
|
|
| 2134 |
|
|
/* remove XAD */
|
| 2135 |
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
| 2136 |
|
|
(nextindex - index - 1) << L2XTSLOTSIZE);
|
| 2137 |
|
|
|
| 2138 |
|
|
p->header.nextindex =
|
| 2139 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
| 2140 |
|
|
1);
|
| 2141 |
|
|
}
|
| 2142 |
|
|
|
| 2143 |
|
|
goto out;
|
| 2144 |
|
|
} else if (xoff == nxoff)
|
| 2145 |
|
|
goto out;
|
| 2146 |
|
|
|
| 2147 |
|
|
if (xoff >= nxoff) {
|
| 2148 |
|
|
XT_PUTPAGE(mp);
|
| 2149 |
|
|
jfs_error(ip->i_sb, "xtUpdate: xoff >= nxoff");
|
| 2150 |
|
|
return -EIO;
|
| 2151 |
|
|
}
|
| 2152 |
|
|
/* #endif _JFS_WIP_COALESCE */
|
| 2153 |
|
|
|
| 2154 |
|
|
/*
|
| 2155 |
|
|
* split XAD into (lXAD, nXAD):
|
| 2156 |
|
|
*
|
| 2157 |
|
|
* |---nXAD--->
|
| 2158 |
|
|
* --|----------XAD----------|--
|
| 2159 |
|
|
* |-lXAD-|
|
| 2160 |
|
|
*/
|
| 2161 |
|
|
updateRight: /* (xoff < nxoff) */
|
| 2162 |
|
|
/* truncate old XAD as lXAD:not_recorded */
|
| 2163 |
|
|
xad = &p->xad[index];
|
| 2164 |
|
|
XADlength(xad, nxoff - xoff);
|
| 2165 |
|
|
|
| 2166 |
|
|
/* insert nXAD:recorded */
|
| 2167 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 2168 |
|
|
rootsplit = p->header.flag & BT_ROOT;
|
| 2169 |
|
|
|
| 2170 |
|
|
/* xtSpliUp() unpins leaf pages */
|
| 2171 |
|
|
split.mp = mp;
|
| 2172 |
|
|
split.index = newindex;
|
| 2173 |
|
|
split.flag = xflag & ~XAD_NOTRECORDED;
|
| 2174 |
|
|
split.off = nxoff;
|
| 2175 |
|
|
split.len = nxlen;
|
| 2176 |
|
|
split.addr = nxaddr;
|
| 2177 |
|
|
split.pxdlist = NULL;
|
| 2178 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
| 2179 |
|
|
return rc;
|
| 2180 |
|
|
|
| 2181 |
|
|
/*
|
| 2182 |
|
|
* if leaf root has been split, original root has been
|
| 2183 |
|
|
* copied to new child page, i.e., original entry now
|
| 2184 |
|
|
* resides on the new child page;
|
| 2185 |
|
|
*/
|
| 2186 |
|
|
if (rootsplit) {
|
| 2187 |
|
|
ASSERT(p->header.nextindex ==
|
| 2188 |
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
| 2189 |
|
|
xad = &p->xad[XTENTRYSTART];
|
| 2190 |
|
|
bn = addressXAD(xad);
|
| 2191 |
|
|
|
| 2192 |
|
|
/* get new child page */
|
| 2193 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 2194 |
|
|
if (rc)
|
| 2195 |
|
|
return rc;
|
| 2196 |
|
|
|
| 2197 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2198 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 2199 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
| 2200 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2201 |
|
|
}
|
| 2202 |
|
|
} else {
|
| 2203 |
|
|
/* get back old page */
|
| 2204 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 2205 |
|
|
if (rc)
|
| 2206 |
|
|
return rc;
|
| 2207 |
|
|
|
| 2208 |
|
|
/* is nXAD on new page ? */
|
| 2209 |
|
|
if (newindex >
|
| 2210 |
|
|
(le16_to_cpu(p->header.maxentry) >> 1)) {
|
| 2211 |
|
|
newindex =
|
| 2212 |
|
|
newindex -
|
| 2213 |
|
|
le16_to_cpu(p->header.nextindex) +
|
| 2214 |
|
|
XTENTRYSTART;
|
| 2215 |
|
|
newpage = 1;
|
| 2216 |
|
|
}
|
| 2217 |
|
|
}
|
| 2218 |
|
|
} else {
|
| 2219 |
|
|
/* if insert into middle, shift right remaining entries */
|
| 2220 |
|
|
if (newindex < nextindex)
|
| 2221 |
|
|
memmove(&p->xad[newindex + 1], &p->xad[newindex],
|
| 2222 |
|
|
(nextindex - newindex) << L2XTSLOTSIZE);
|
| 2223 |
|
|
|
| 2224 |
|
|
/* insert the entry */
|
| 2225 |
|
|
xad = &p->xad[newindex];
|
| 2226 |
|
|
*xad = *nxad;
|
| 2227 |
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
| 2228 |
|
|
|
| 2229 |
|
|
/* advance next available entry index. */
|
| 2230 |
|
|
p->header.nextindex =
|
| 2231 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 2232 |
|
|
}
|
| 2233 |
|
|
|
| 2234 |
|
|
/*
|
| 2235 |
|
|
* does nXAD force 3-way split ?
|
| 2236 |
|
|
*
|
| 2237 |
|
|
* |---nXAD--->|
|
| 2238 |
|
|
* --|----------XAD-------------|--
|
| 2239 |
|
|
* |-lXAD-| |-rXAD -|
|
| 2240 |
|
|
*/
|
| 2241 |
|
|
if (nxoff + nxlen == xoff + xlen)
|
| 2242 |
|
|
goto out;
|
| 2243 |
|
|
|
| 2244 |
|
|
/* reorient nXAD as XAD for further split XAD into (nXAD, rXAD) */
|
| 2245 |
|
|
if (newpage) {
|
| 2246 |
|
|
/* close out old page */
|
| 2247 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 2248 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 2249 |
|
|
min(index0, (int)xtlck->lwm.offset) : index0;
|
| 2250 |
|
|
xtlck->lwm.length =
|
| 2251 |
|
|
le16_to_cpu(p->header.nextindex) -
|
| 2252 |
|
|
xtlck->lwm.offset;
|
| 2253 |
|
|
}
|
| 2254 |
|
|
|
| 2255 |
|
|
bn = le64_to_cpu(p->header.next);
|
| 2256 |
|
|
XT_PUTPAGE(mp);
|
| 2257 |
|
|
|
| 2258 |
|
|
/* get new right page */
|
| 2259 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 2260 |
|
|
if (rc)
|
| 2261 |
|
|
return rc;
|
| 2262 |
|
|
|
| 2263 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2264 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 2265 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 2266 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2267 |
|
|
}
|
| 2268 |
|
|
|
| 2269 |
|
|
index0 = index = newindex;
|
| 2270 |
|
|
} else
|
| 2271 |
|
|
index++;
|
| 2272 |
|
|
|
| 2273 |
|
|
newindex = index + 1;
|
| 2274 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2275 |
|
|
xlen = xlen - (nxoff - xoff);
|
| 2276 |
|
|
xoff = nxoff;
|
| 2277 |
|
|
xaddr = nxaddr;
|
| 2278 |
|
|
|
| 2279 |
|
|
/* recompute split pages */
|
| 2280 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 2281 |
|
|
XT_PUTPAGE(mp);
|
| 2282 |
|
|
|
| 2283 |
|
|
if ((rc = xtSearch(ip, nxoff, &cmp, &btstack, XT_INSERT)))
|
| 2284 |
|
|
return rc;
|
| 2285 |
|
|
|
| 2286 |
|
|
/* retrieve search result */
|
| 2287 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index0);
|
| 2288 |
|
|
|
| 2289 |
|
|
if (cmp != 0) {
|
| 2290 |
|
|
XT_PUTPAGE(mp);
|
| 2291 |
|
|
jfs_error(ip->i_sb, "xtUpdate: xtSearch failed");
|
| 2292 |
|
|
return -EIO;
|
| 2293 |
|
|
}
|
| 2294 |
|
|
|
| 2295 |
|
|
if (index0 != index) {
|
| 2296 |
|
|
XT_PUTPAGE(mp);
|
| 2297 |
|
|
jfs_error(ip->i_sb,
|
| 2298 |
|
|
"xtUpdate: unexpected value of index");
|
| 2299 |
|
|
return -EIO;
|
| 2300 |
|
|
}
|
| 2301 |
|
|
}
|
| 2302 |
|
|
|
| 2303 |
|
|
/*
|
| 2304 |
|
|
* split XAD into (nXAD, rXAD)
|
| 2305 |
|
|
*
|
| 2306 |
|
|
* ---nXAD---|
|
| 2307 |
|
|
* --|----------XAD----------|--
|
| 2308 |
|
|
* |-rXAD-|
|
| 2309 |
|
|
*/
|
| 2310 |
|
|
updateLeft: /* (nxoff == xoff) && (nxlen < xlen) */
|
| 2311 |
|
|
/* update old XAD with nXAD:recorded */
|
| 2312 |
|
|
xad = &p->xad[index];
|
| 2313 |
|
|
*xad = *nxad;
|
| 2314 |
|
|
xad->flag = xflag & ~XAD_NOTRECORDED;
|
| 2315 |
|
|
|
| 2316 |
|
|
/* insert rXAD:not_recorded */
|
| 2317 |
|
|
xoff = xoff + nxlen;
|
| 2318 |
|
|
xlen = xlen - nxlen;
|
| 2319 |
|
|
xaddr = xaddr + nxlen;
|
| 2320 |
|
|
if (nextindex == le16_to_cpu(p->header.maxentry)) {
|
| 2321 |
|
|
rootsplit = p->header.flag & BT_ROOT;
|
| 2322 |
|
|
|
| 2323 |
|
|
/*
|
| 2324 |
|
|
printf("xtUpdate.updateLeft.split p:0x%p\n", p);
|
| 2325 |
|
|
*/
|
| 2326 |
|
|
/* xtSpliUp() unpins leaf pages */
|
| 2327 |
|
|
split.mp = mp;
|
| 2328 |
|
|
split.index = newindex;
|
| 2329 |
|
|
split.flag = xflag;
|
| 2330 |
|
|
split.off = xoff;
|
| 2331 |
|
|
split.len = xlen;
|
| 2332 |
|
|
split.addr = xaddr;
|
| 2333 |
|
|
split.pxdlist = NULL;
|
| 2334 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack)))
|
| 2335 |
|
|
return rc;
|
| 2336 |
|
|
|
| 2337 |
|
|
/*
|
| 2338 |
|
|
* if leaf root has been split, original root has been
|
| 2339 |
|
|
* copied to new child page, i.e., original entry now
|
| 2340 |
|
|
* resides on the new child page;
|
| 2341 |
|
|
*/
|
| 2342 |
|
|
if (rootsplit) {
|
| 2343 |
|
|
ASSERT(p->header.nextindex ==
|
| 2344 |
|
|
cpu_to_le16(XTENTRYSTART + 1));
|
| 2345 |
|
|
xad = &p->xad[XTENTRYSTART];
|
| 2346 |
|
|
bn = addressXAD(xad);
|
| 2347 |
|
|
|
| 2348 |
|
|
/* get new child page */
|
| 2349 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 2350 |
|
|
if (rc)
|
| 2351 |
|
|
return rc;
|
| 2352 |
|
|
|
| 2353 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2354 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 2355 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE|tlckGROW);
|
| 2356 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2357 |
|
|
}
|
| 2358 |
|
|
} else {
|
| 2359 |
|
|
/* get back old page */
|
| 2360 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 2361 |
|
|
if (rc)
|
| 2362 |
|
|
return rc;
|
| 2363 |
|
|
}
|
| 2364 |
|
|
} else {
|
| 2365 |
|
|
/* if insert into middle, shift right remaining entries */
|
| 2366 |
|
|
if (newindex < nextindex)
|
| 2367 |
|
|
memmove(&p->xad[newindex + 1], &p->xad[newindex],
|
| 2368 |
|
|
(nextindex - newindex) << L2XTSLOTSIZE);
|
| 2369 |
|
|
|
| 2370 |
|
|
/* insert the entry */
|
| 2371 |
|
|
xad = &p->xad[newindex];
|
| 2372 |
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
| 2373 |
|
|
|
| 2374 |
|
|
/* advance next available entry index. */
|
| 2375 |
|
|
p->header.nextindex =
|
| 2376 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 2377 |
|
|
}
|
| 2378 |
|
|
|
| 2379 |
|
|
out:
|
| 2380 |
|
|
if (!test_cflag(COMMIT_Nolink, ip)) {
|
| 2381 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 2382 |
|
|
min(index0, (int)xtlck->lwm.offset) : index0;
|
| 2383 |
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
| 2384 |
|
|
xtlck->lwm.offset;
|
| 2385 |
|
|
}
|
| 2386 |
|
|
|
| 2387 |
|
|
/* unpin the leaf page */
|
| 2388 |
|
|
XT_PUTPAGE(mp);
|
| 2389 |
|
|
|
| 2390 |
|
|
return rc;
|
| 2391 |
|
|
}
|
| 2392 |
|
|
|
| 2393 |
|
|
|
| 2394 |
|
|
/*
|
| 2395 |
|
|
* xtAppend()
|
| 2396 |
|
|
*
|
| 2397 |
|
|
* function: grow in append mode from contiguous region specified ;
|
| 2398 |
|
|
*
|
| 2399 |
|
|
* parameter:
|
| 2400 |
|
|
* tid - transaction id;
|
| 2401 |
|
|
* ip - file object;
|
| 2402 |
|
|
* xflag - extent flag:
|
| 2403 |
|
|
* xoff - extent offset;
|
| 2404 |
|
|
* maxblocks - max extent length;
|
| 2405 |
|
|
* xlen - extent length (in/out);
|
| 2406 |
|
|
* xaddrp - extent address pointer (in/out):
|
| 2407 |
|
|
* flag -
|
| 2408 |
|
|
*
|
| 2409 |
|
|
* return:
|
| 2410 |
|
|
*/
|
| 2411 |
|
|
int xtAppend(tid_t tid, /* transaction id */
|
| 2412 |
|
|
struct inode *ip, int xflag, s64 xoff, s32 maxblocks,
|
| 2413 |
|
|
s32 * xlenp, /* (in/out) */
|
| 2414 |
|
|
s64 * xaddrp, /* (in/out) */
|
| 2415 |
|
|
int flag)
|
| 2416 |
|
|
{
|
| 2417 |
|
|
int rc = 0;
|
| 2418 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 2419 |
|
|
xtpage_t *p; /* base B+-tree index page */
|
| 2420 |
|
|
s64 bn, xaddr;
|
| 2421 |
|
|
int index, nextindex;
|
| 2422 |
|
|
struct btstack btstack; /* traverse stack */
|
| 2423 |
|
|
struct xtsplit split; /* split information */
|
| 2424 |
|
|
xad_t *xad;
|
| 2425 |
|
|
int cmp;
|
| 2426 |
|
|
struct tlock *tlck;
|
| 2427 |
|
|
struct xtlock *xtlck;
|
| 2428 |
|
|
int nsplit, nblocks, xlen;
|
| 2429 |
|
|
struct pxdlist pxdlist;
|
| 2430 |
|
|
pxd_t *pxd;
|
| 2431 |
|
|
|
| 2432 |
|
|
xaddr = *xaddrp;
|
| 2433 |
|
|
xlen = *xlenp;
|
| 2434 |
|
|
jfs_info("xtAppend: xoff:0x%lx maxblocks:%d xlen:%d xaddr:0x%lx",
|
| 2435 |
|
|
(ulong) xoff, maxblocks, xlen, (ulong) xaddr);
|
| 2436 |
|
|
|
| 2437 |
|
|
/*
|
| 2438 |
|
|
* search for the entry location at which to insert:
|
| 2439 |
|
|
*
|
| 2440 |
|
|
* xtFastSearch() and xtSearch() both returns (leaf page
|
| 2441 |
|
|
* pinned, index at which to insert).
|
| 2442 |
|
|
* n.b. xtSearch() may return index of maxentry of
|
| 2443 |
|
|
* the full page.
|
| 2444 |
|
|
*/
|
| 2445 |
|
|
if ((rc = xtSearch(ip, xoff, &cmp, &btstack, XT_INSERT)))
|
| 2446 |
|
|
return rc;
|
| 2447 |
|
|
|
| 2448 |
|
|
/* retrieve search result */
|
| 2449 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 2450 |
|
|
|
| 2451 |
|
|
if (cmp == 0) {
|
| 2452 |
|
|
rc = -EEXIST;
|
| 2453 |
|
|
goto out;
|
| 2454 |
|
|
}
|
| 2455 |
|
|
//insert:
|
| 2456 |
|
|
/*
|
| 2457 |
|
|
* insert entry for new extent
|
| 2458 |
|
|
*/
|
| 2459 |
|
|
xflag |= XAD_NEW;
|
| 2460 |
|
|
|
| 2461 |
|
|
/*
|
| 2462 |
|
|
* if the leaf page is full, split the page and
|
| 2463 |
|
|
* propagate up the router entry for the new page from split
|
| 2464 |
|
|
*
|
| 2465 |
|
|
* The xtSplitUp() will insert the entry and unpin the leaf page.
|
| 2466 |
|
|
*/
|
| 2467 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2468 |
|
|
if (nextindex < le16_to_cpu(p->header.maxentry))
|
| 2469 |
|
|
goto insertLeaf;
|
| 2470 |
|
|
|
| 2471 |
|
|
/*
|
| 2472 |
|
|
* allocate new index blocks to cover index page split(s)
|
| 2473 |
|
|
*/
|
| 2474 |
|
|
nsplit = btstack.nsplit;
|
| 2475 |
|
|
split.pxdlist = &pxdlist;
|
| 2476 |
|
|
pxdlist.maxnpxd = pxdlist.npxd = 0;
|
| 2477 |
|
|
pxd = &pxdlist.pxd[0];
|
| 2478 |
|
|
nblocks = JFS_SBI(ip->i_sb)->nbperpage;
|
| 2479 |
|
|
for (; nsplit > 0; nsplit--, pxd++, xaddr += nblocks, maxblocks -= nblocks) {
|
| 2480 |
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) nblocks)) == 0) {
|
| 2481 |
|
|
PXDaddress(pxd, xaddr);
|
| 2482 |
|
|
PXDlength(pxd, nblocks);
|
| 2483 |
|
|
|
| 2484 |
|
|
pxdlist.maxnpxd++;
|
| 2485 |
|
|
|
| 2486 |
|
|
continue;
|
| 2487 |
|
|
}
|
| 2488 |
|
|
|
| 2489 |
|
|
/* undo allocation */
|
| 2490 |
|
|
|
| 2491 |
|
|
goto out;
|
| 2492 |
|
|
}
|
| 2493 |
|
|
|
| 2494 |
|
|
xlen = min(xlen, maxblocks);
|
| 2495 |
|
|
|
| 2496 |
|
|
/*
|
| 2497 |
|
|
* allocate data extent requested
|
| 2498 |
|
|
*/
|
| 2499 |
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) xlen)))
|
| 2500 |
|
|
goto out;
|
| 2501 |
|
|
|
| 2502 |
|
|
split.mp = mp;
|
| 2503 |
|
|
split.index = index;
|
| 2504 |
|
|
split.flag = xflag;
|
| 2505 |
|
|
split.off = xoff;
|
| 2506 |
|
|
split.len = xlen;
|
| 2507 |
|
|
split.addr = xaddr;
|
| 2508 |
|
|
if ((rc = xtSplitUp(tid, ip, &split, &btstack))) {
|
| 2509 |
|
|
/* undo data extent allocation */
|
| 2510 |
|
|
dbFree(ip, *xaddrp, (s64) * xlenp);
|
| 2511 |
|
|
|
| 2512 |
|
|
return rc;
|
| 2513 |
|
|
}
|
| 2514 |
|
|
|
| 2515 |
|
|
*xaddrp = xaddr;
|
| 2516 |
|
|
*xlenp = xlen;
|
| 2517 |
|
|
return 0;
|
| 2518 |
|
|
|
| 2519 |
|
|
/*
|
| 2520 |
|
|
* insert the new entry into the leaf page
|
| 2521 |
|
|
*/
|
| 2522 |
|
|
insertLeaf:
|
| 2523 |
|
|
/*
|
| 2524 |
|
|
* allocate data extent requested
|
| 2525 |
|
|
*/
|
| 2526 |
|
|
if ((rc = dbAllocBottomUp(ip, xaddr, (s64) xlen)))
|
| 2527 |
|
|
goto out;
|
| 2528 |
|
|
|
| 2529 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2530 |
|
|
/*
|
| 2531 |
|
|
* acquire a transaction lock on the leaf page;
|
| 2532 |
|
|
*
|
| 2533 |
|
|
* action: xad insertion/extension;
|
| 2534 |
|
|
*/
|
| 2535 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckGROW);
|
| 2536 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2537 |
|
|
|
| 2538 |
|
|
/* insert the new entry: mark the entry NEW */
|
| 2539 |
|
|
xad = &p->xad[index];
|
| 2540 |
|
|
XT_PUTENTRY(xad, xflag, xoff, xlen, xaddr);
|
| 2541 |
|
|
|
| 2542 |
|
|
/* advance next available entry index */
|
| 2543 |
|
|
p->header.nextindex =
|
| 2544 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
|
| 2545 |
|
|
|
| 2546 |
|
|
xtlck->lwm.offset =
|
| 2547 |
|
|
(xtlck->lwm.offset) ? min(index,(int) xtlck->lwm.offset) : index;
|
| 2548 |
|
|
xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
|
| 2549 |
|
|
xtlck->lwm.offset;
|
| 2550 |
|
|
|
| 2551 |
|
|
*xaddrp = xaddr;
|
| 2552 |
|
|
*xlenp = xlen;
|
| 2553 |
|
|
|
| 2554 |
|
|
out:
|
| 2555 |
|
|
/* unpin the leaf page */
|
| 2556 |
|
|
XT_PUTPAGE(mp);
|
| 2557 |
|
|
|
| 2558 |
|
|
return rc;
|
| 2559 |
|
|
}
|
| 2560 |
|
|
#ifdef _STILL_TO_PORT
|
| 2561 |
|
|
|
| 2562 |
|
|
/* - TBD for defragmentaion/reorganization -
|
| 2563 |
|
|
*
|
| 2564 |
|
|
* xtDelete()
|
| 2565 |
|
|
*
|
| 2566 |
|
|
* function:
|
| 2567 |
|
|
* delete the entry with the specified key.
|
| 2568 |
|
|
*
|
| 2569 |
|
|
* N.B.: whole extent of the entry is assumed to be deleted.
|
| 2570 |
|
|
*
|
| 2571 |
|
|
* parameter:
|
| 2572 |
|
|
*
|
| 2573 |
|
|
* return:
|
| 2574 |
|
|
* ENOENT: if the entry is not found.
|
| 2575 |
|
|
*
|
| 2576 |
|
|
* exception:
|
| 2577 |
|
|
*/
|
| 2578 |
|
|
int xtDelete(tid_t tid, struct inode *ip, s64 xoff, s32 xlen, int flag)
|
| 2579 |
|
|
{
|
| 2580 |
|
|
int rc = 0;
|
| 2581 |
|
|
struct btstack btstack;
|
| 2582 |
|
|
int cmp;
|
| 2583 |
|
|
s64 bn;
|
| 2584 |
|
|
struct metapage *mp;
|
| 2585 |
|
|
xtpage_t *p;
|
| 2586 |
|
|
int index, nextindex;
|
| 2587 |
|
|
struct tlock *tlck;
|
| 2588 |
|
|
struct xtlock *xtlck;
|
| 2589 |
|
|
|
| 2590 |
|
|
/*
|
| 2591 |
|
|
* find the matching entry; xtSearch() pins the page
|
| 2592 |
|
|
*/
|
| 2593 |
|
|
if ((rc = xtSearch(ip, xoff, &cmp, &btstack, 0)))
|
| 2594 |
|
|
return rc;
|
| 2595 |
|
|
|
| 2596 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 2597 |
|
|
if (cmp) {
|
| 2598 |
|
|
/* unpin the leaf page */
|
| 2599 |
|
|
XT_PUTPAGE(mp);
|
| 2600 |
|
|
return -ENOENT;
|
| 2601 |
|
|
}
|
| 2602 |
|
|
|
| 2603 |
|
|
/*
|
| 2604 |
|
|
* delete the entry from the leaf page
|
| 2605 |
|
|
*/
|
| 2606 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2607 |
|
|
p->header.nextindex =
|
| 2608 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) - 1);
|
| 2609 |
|
|
|
| 2610 |
|
|
/*
|
| 2611 |
|
|
* if the leaf page bocome empty, free the page
|
| 2612 |
|
|
*/
|
| 2613 |
|
|
if (p->header.nextindex == cpu_to_le16(XTENTRYSTART))
|
| 2614 |
|
|
return (xtDeleteUp(tid, ip, mp, p, &btstack));
|
| 2615 |
|
|
|
| 2616 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2617 |
|
|
/*
|
| 2618 |
|
|
* acquire a transaction lock on the leaf page;
|
| 2619 |
|
|
*
|
| 2620 |
|
|
* action:xad deletion;
|
| 2621 |
|
|
*/
|
| 2622 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 2623 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2624 |
|
|
xtlck->lwm.offset =
|
| 2625 |
|
|
(xtlck->lwm.offset) ? min(index, xtlck->lwm.offset) : index;
|
| 2626 |
|
|
|
| 2627 |
|
|
/* if delete from middle, shift left/compact the remaining entries */
|
| 2628 |
|
|
if (index < nextindex - 1)
|
| 2629 |
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
| 2630 |
|
|
(nextindex - index - 1) * sizeof(xad_t));
|
| 2631 |
|
|
|
| 2632 |
|
|
XT_PUTPAGE(mp);
|
| 2633 |
|
|
|
| 2634 |
|
|
return 0;
|
| 2635 |
|
|
}
|
| 2636 |
|
|
|
| 2637 |
|
|
|
| 2638 |
|
|
/* - TBD for defragmentaion/reorganization -
|
| 2639 |
|
|
*
|
| 2640 |
|
|
* xtDeleteUp()
|
| 2641 |
|
|
*
|
| 2642 |
|
|
* function:
|
| 2643 |
|
|
* free empty pages as propagating deletion up the tree
|
| 2644 |
|
|
*
|
| 2645 |
|
|
* parameter:
|
| 2646 |
|
|
*
|
| 2647 |
|
|
* return:
|
| 2648 |
|
|
*/
|
| 2649 |
|
|
static int
|
| 2650 |
|
|
xtDeleteUp(tid_t tid, struct inode *ip,
|
| 2651 |
|
|
struct metapage * fmp, xtpage_t * fp, struct btstack * btstack)
|
| 2652 |
|
|
{
|
| 2653 |
|
|
int rc = 0;
|
| 2654 |
|
|
struct metapage *mp;
|
| 2655 |
|
|
xtpage_t *p;
|
| 2656 |
|
|
int index, nextindex;
|
| 2657 |
|
|
s64 xaddr;
|
| 2658 |
|
|
int xlen;
|
| 2659 |
|
|
struct btframe *parent;
|
| 2660 |
|
|
struct tlock *tlck;
|
| 2661 |
|
|
struct xtlock *xtlck;
|
| 2662 |
|
|
|
| 2663 |
|
|
/*
|
| 2664 |
|
|
* keep root leaf page which has become empty
|
| 2665 |
|
|
*/
|
| 2666 |
|
|
if (fp->header.flag & BT_ROOT) {
|
| 2667 |
|
|
/* keep the root page */
|
| 2668 |
|
|
fp->header.flag &= ~BT_INTERNAL;
|
| 2669 |
|
|
fp->header.flag |= BT_LEAF;
|
| 2670 |
|
|
fp->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 2671 |
|
|
|
| 2672 |
|
|
/* XT_PUTPAGE(fmp); */
|
| 2673 |
|
|
|
| 2674 |
|
|
return 0;
|
| 2675 |
|
|
}
|
| 2676 |
|
|
|
| 2677 |
|
|
/*
|
| 2678 |
|
|
* free non-root leaf page
|
| 2679 |
|
|
*/
|
| 2680 |
|
|
if ((rc = xtRelink(tid, ip, fp))) {
|
| 2681 |
|
|
XT_PUTPAGE(fmp);
|
| 2682 |
|
|
return rc;
|
| 2683 |
|
|
}
|
| 2684 |
|
|
|
| 2685 |
|
|
xaddr = addressPXD(&fp->header.self);
|
| 2686 |
|
|
xlen = lengthPXD(&fp->header.self);
|
| 2687 |
|
|
/* free the page extent */
|
| 2688 |
|
|
dbFree(ip, xaddr, (s64) xlen);
|
| 2689 |
|
|
|
| 2690 |
|
|
/* free the buffer page */
|
| 2691 |
|
|
discard_metapage(fmp);
|
| 2692 |
|
|
|
| 2693 |
|
|
/*
|
| 2694 |
|
|
* propagate page deletion up the index tree
|
| 2695 |
|
|
*
|
| 2696 |
|
|
* If the delete from the parent page makes it empty,
|
| 2697 |
|
|
* continue all the way up the tree.
|
| 2698 |
|
|
* stop if the root page is reached (which is never deleted) or
|
| 2699 |
|
|
* if the entry deletion does not empty the page.
|
| 2700 |
|
|
*/
|
| 2701 |
|
|
while ((parent = BT_POP(btstack)) != NULL) {
|
| 2702 |
|
|
/* get/pin the parent page <sp> */
|
| 2703 |
|
|
XT_GETPAGE(ip, parent->bn, mp, PSIZE, p, rc);
|
| 2704 |
|
|
if (rc)
|
| 2705 |
|
|
return rc;
|
| 2706 |
|
|
|
| 2707 |
|
|
index = parent->index;
|
| 2708 |
|
|
|
| 2709 |
|
|
/* delete the entry for the freed child page from parent.
|
| 2710 |
|
|
*/
|
| 2711 |
|
|
nextindex = le16_to_cpu(p->header.nextindex);
|
| 2712 |
|
|
|
| 2713 |
|
|
/*
|
| 2714 |
|
|
* the parent has the single entry being deleted:
|
| 2715 |
|
|
* free the parent page which has become empty.
|
| 2716 |
|
|
*/
|
| 2717 |
|
|
if (nextindex == 1) {
|
| 2718 |
|
|
if (p->header.flag & BT_ROOT) {
|
| 2719 |
|
|
/* keep the root page */
|
| 2720 |
|
|
p->header.flag &= ~BT_INTERNAL;
|
| 2721 |
|
|
p->header.flag |= BT_LEAF;
|
| 2722 |
|
|
p->header.nextindex =
|
| 2723 |
|
|
cpu_to_le16(XTENTRYSTART);
|
| 2724 |
|
|
|
| 2725 |
|
|
/* XT_PUTPAGE(mp); */
|
| 2726 |
|
|
|
| 2727 |
|
|
break;
|
| 2728 |
|
|
} else {
|
| 2729 |
|
|
/* free the parent page */
|
| 2730 |
|
|
if ((rc = xtRelink(tid, ip, p)))
|
| 2731 |
|
|
return rc;
|
| 2732 |
|
|
|
| 2733 |
|
|
xaddr = addressPXD(&p->header.self);
|
| 2734 |
|
|
/* free the page extent */
|
| 2735 |
|
|
dbFree(ip, xaddr,
|
| 2736 |
|
|
(s64) JFS_SBI(ip->i_sb)->nbperpage);
|
| 2737 |
|
|
|
| 2738 |
|
|
/* unpin/free the buffer page */
|
| 2739 |
|
|
discard_metapage(mp);
|
| 2740 |
|
|
|
| 2741 |
|
|
/* propagate up */
|
| 2742 |
|
|
continue;
|
| 2743 |
|
|
}
|
| 2744 |
|
|
}
|
| 2745 |
|
|
/*
|
| 2746 |
|
|
* the parent has other entries remaining:
|
| 2747 |
|
|
* delete the router entry from the parent page.
|
| 2748 |
|
|
*/
|
| 2749 |
|
|
else {
|
| 2750 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 2751 |
|
|
/*
|
| 2752 |
|
|
* acquire a transaction lock on the leaf page;
|
| 2753 |
|
|
*
|
| 2754 |
|
|
* action:xad deletion;
|
| 2755 |
|
|
*/
|
| 2756 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 2757 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 2758 |
|
|
xtlck->lwm.offset =
|
| 2759 |
|
|
(xtlck->lwm.offset) ? min(index,
|
| 2760 |
|
|
xtlck->lwm.
|
| 2761 |
|
|
offset) : index;
|
| 2762 |
|
|
|
| 2763 |
|
|
/* if delete from middle,
|
| 2764 |
|
|
* shift left/compact the remaining entries in the page
|
| 2765 |
|
|
*/
|
| 2766 |
|
|
if (index < nextindex - 1)
|
| 2767 |
|
|
memmove(&p->xad[index], &p->xad[index + 1],
|
| 2768 |
|
|
(nextindex - index -
|
| 2769 |
|
|
1) << L2XTSLOTSIZE);
|
| 2770 |
|
|
|
| 2771 |
|
|
p->header.nextindex =
|
| 2772 |
|
|
cpu_to_le16(le16_to_cpu(p->header.nextindex) -
|
| 2773 |
|
|
1);
|
| 2774 |
|
|
jfs_info("xtDeleteUp(entry): 0x%lx[%d]",
|
| 2775 |
|
|
(ulong) parent->bn, index);
|
| 2776 |
|
|
}
|
| 2777 |
|
|
|
| 2778 |
|
|
/* unpin the parent page */
|
| 2779 |
|
|
XT_PUTPAGE(mp);
|
| 2780 |
|
|
|
| 2781 |
|
|
/* exit propagation up */
|
| 2782 |
|
|
break;
|
| 2783 |
|
|
}
|
| 2784 |
|
|
|
| 2785 |
|
|
return 0;
|
| 2786 |
|
|
}
|
| 2787 |
|
|
|
| 2788 |
|
|
|
| 2789 |
|
|
/*
|
| 2790 |
|
|
* NAME: xtRelocate()
|
| 2791 |
|
|
*
|
| 2792 |
|
|
* FUNCTION: relocate xtpage or data extent of regular file;
|
| 2793 |
|
|
* This function is mainly used by defragfs utility.
|
| 2794 |
|
|
*
|
| 2795 |
|
|
* NOTE: This routine does not have the logic to handle
|
| 2796 |
|
|
* uncommitted allocated extent. The caller should call
|
| 2797 |
|
|
* txCommit() to commit all the allocation before call
|
| 2798 |
|
|
* this routine.
|
| 2799 |
|
|
*/
|
| 2800 |
|
|
int
|
| 2801 |
|
|
xtRelocate(tid_t tid, struct inode * ip, xad_t * oxad, /* old XAD */
|
| 2802 |
|
|
s64 nxaddr, /* new xaddr */
|
| 2803 |
|
|
int xtype)
|
| 2804 |
|
|
{ /* extent type: XTPAGE or DATAEXT */
|
| 2805 |
|
|
int rc = 0;
|
| 2806 |
|
|
struct tblock *tblk;
|
| 2807 |
|
|
struct tlock *tlck;
|
| 2808 |
|
|
struct xtlock *xtlck;
|
| 2809 |
|
|
struct metapage *mp, *pmp, *lmp, *rmp; /* meta-page buffer */
|
| 2810 |
|
|
xtpage_t *p, *pp, *rp, *lp; /* base B+-tree index page */
|
| 2811 |
|
|
xad_t *xad;
|
| 2812 |
|
|
pxd_t *pxd;
|
| 2813 |
|
|
s64 xoff, xsize;
|
| 2814 |
|
|
int xlen;
|
| 2815 |
|
|
s64 oxaddr, sxaddr, dxaddr, nextbn, prevbn;
|
| 2816 |
|
|
cbuf_t *cp;
|
| 2817 |
|
|
s64 offset, nbytes, nbrd, pno;
|
| 2818 |
|
|
int nb, npages, nblks;
|
| 2819 |
|
|
s64 bn;
|
| 2820 |
|
|
int cmp;
|
| 2821 |
|
|
int index;
|
| 2822 |
|
|
struct pxd_lock *pxdlock;
|
| 2823 |
|
|
struct btstack btstack; /* traverse stack */
|
| 2824 |
|
|
|
| 2825 |
|
|
xtype = xtype & EXTENT_TYPE;
|
| 2826 |
|
|
|
| 2827 |
|
|
xoff = offsetXAD(oxad);
|
| 2828 |
|
|
oxaddr = addressXAD(oxad);
|
| 2829 |
|
|
xlen = lengthXAD(oxad);
|
| 2830 |
|
|
|
| 2831 |
|
|
/* validate extent offset */
|
| 2832 |
|
|
offset = xoff << JFS_SBI(ip->i_sb)->l2bsize;
|
| 2833 |
|
|
if (offset >= ip->i_size)
|
| 2834 |
|
|
return -ESTALE; /* stale extent */
|
| 2835 |
|
|
|
| 2836 |
|
|
jfs_info("xtRelocate: xtype:%d xoff:0x%lx xlen:0x%x xaddr:0x%lx:0x%lx",
|
| 2837 |
|
|
xtype, (ulong) xoff, xlen, (ulong) oxaddr, (ulong) nxaddr);
|
| 2838 |
|
|
|
| 2839 |
|
|
/*
|
| 2840 |
|
|
* 1. get and validate the parent xtpage/xad entry
|
| 2841 |
|
|
* covering the source extent to be relocated;
|
| 2842 |
|
|
*/
|
| 2843 |
|
|
if (xtype == DATAEXT) {
|
| 2844 |
|
|
/* search in leaf entry */
|
| 2845 |
|
|
rc = xtSearch(ip, xoff, &cmp, &btstack, 0);
|
| 2846 |
|
|
if (rc)
|
| 2847 |
|
|
return rc;
|
| 2848 |
|
|
|
| 2849 |
|
|
/* retrieve search result */
|
| 2850 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
| 2851 |
|
|
|
| 2852 |
|
|
if (cmp) {
|
| 2853 |
|
|
XT_PUTPAGE(pmp);
|
| 2854 |
|
|
return -ESTALE;
|
| 2855 |
|
|
}
|
| 2856 |
|
|
|
| 2857 |
|
|
/* validate for exact match with a single entry */
|
| 2858 |
|
|
xad = &pp->xad[index];
|
| 2859 |
|
|
if (addressXAD(xad) != oxaddr || lengthXAD(xad) != xlen) {
|
| 2860 |
|
|
XT_PUTPAGE(pmp);
|
| 2861 |
|
|
return -ESTALE;
|
| 2862 |
|
|
}
|
| 2863 |
|
|
} else { /* (xtype == XTPAGE) */
|
| 2864 |
|
|
|
| 2865 |
|
|
/* search in internal entry */
|
| 2866 |
|
|
rc = xtSearchNode(ip, oxad, &cmp, &btstack, 0);
|
| 2867 |
|
|
if (rc)
|
| 2868 |
|
|
return rc;
|
| 2869 |
|
|
|
| 2870 |
|
|
/* retrieve search result */
|
| 2871 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
| 2872 |
|
|
|
| 2873 |
|
|
if (cmp) {
|
| 2874 |
|
|
XT_PUTPAGE(pmp);
|
| 2875 |
|
|
return -ESTALE;
|
| 2876 |
|
|
}
|
| 2877 |
|
|
|
| 2878 |
|
|
/* xtSearchNode() validated for exact match with a single entry
|
| 2879 |
|
|
*/
|
| 2880 |
|
|
xad = &pp->xad[index];
|
| 2881 |
|
|
}
|
| 2882 |
|
|
jfs_info("xtRelocate: parent xad entry validated.");
|
| 2883 |
|
|
|
| 2884 |
|
|
/*
|
| 2885 |
|
|
* 2. relocate the extent
|
| 2886 |
|
|
*/
|
| 2887 |
|
|
if (xtype == DATAEXT) {
|
| 2888 |
|
|
/* if the extent is allocated-but-not-recorded
|
| 2889 |
|
|
* there is no real data to be moved in this extent,
|
| 2890 |
|
|
*/
|
| 2891 |
|
|
if (xad->flag & XAD_NOTRECORDED)
|
| 2892 |
|
|
goto out;
|
| 2893 |
|
|
else
|
| 2894 |
|
|
/* release xtpage for cmRead()/xtLookup() */
|
| 2895 |
|
|
XT_PUTPAGE(pmp);
|
| 2896 |
|
|
|
| 2897 |
|
|
/*
|
| 2898 |
|
|
* cmRelocate()
|
| 2899 |
|
|
*
|
| 2900 |
|
|
* copy target data pages to be relocated;
|
| 2901 |
|
|
*
|
| 2902 |
|
|
* data extent must start at page boundary and
|
| 2903 |
|
|
* multiple of page size (except the last data extent);
|
| 2904 |
|
|
* read in each page of the source data extent into cbuf,
|
| 2905 |
|
|
* update the cbuf extent descriptor of the page to be
|
| 2906 |
|
|
* homeward bound to new dst data extent
|
| 2907 |
|
|
* copy the data from the old extent to new extent.
|
| 2908 |
|
|
* copy is essential for compressed files to avoid problems
|
| 2909 |
|
|
* that can arise if there was a change in compression
|
| 2910 |
|
|
* algorithms.
|
| 2911 |
|
|
* it is a good strategy because it may disrupt cache
|
| 2912 |
|
|
* policy to keep the pages in memory afterwards.
|
| 2913 |
|
|
*/
|
| 2914 |
|
|
offset = xoff << JFS_SBI(ip->i_sb)->l2bsize;
|
| 2915 |
|
|
assert((offset & CM_OFFSET) == 0);
|
| 2916 |
|
|
nbytes = xlen << JFS_SBI(ip->i_sb)->l2bsize;
|
| 2917 |
|
|
pno = offset >> CM_L2BSIZE;
|
| 2918 |
|
|
npages = (nbytes + (CM_BSIZE - 1)) >> CM_L2BSIZE;
|
| 2919 |
|
|
/*
|
| 2920 |
|
|
npages = ((offset + nbytes - 1) >> CM_L2BSIZE) -
|
| 2921 |
|
|
(offset >> CM_L2BSIZE) + 1;
|
| 2922 |
|
|
*/
|
| 2923 |
|
|
sxaddr = oxaddr;
|
| 2924 |
|
|
dxaddr = nxaddr;
|
| 2925 |
|
|
|
| 2926 |
|
|
/* process the request one cache buffer at a time */
|
| 2927 |
|
|
for (nbrd = 0; nbrd < nbytes; nbrd += nb,
|
| 2928 |
|
|
offset += nb, pno++, npages--) {
|
| 2929 |
|
|
/* compute page size */
|
| 2930 |
|
|
nb = min(nbytes - nbrd, CM_BSIZE);
|
| 2931 |
|
|
|
| 2932 |
|
|
/* get the cache buffer of the page */
|
| 2933 |
|
|
if (rc = cmRead(ip, offset, npages, &cp))
|
| 2934 |
|
|
break;
|
| 2935 |
|
|
|
| 2936 |
|
|
assert(addressPXD(&cp->cm_pxd) == sxaddr);
|
| 2937 |
|
|
assert(!cp->cm_modified);
|
| 2938 |
|
|
|
| 2939 |
|
|
/* bind buffer with the new extent address */
|
| 2940 |
|
|
nblks = nb >> JFS_IP(ip->i_sb)->l2bsize;
|
| 2941 |
|
|
cmSetXD(ip, cp, pno, dxaddr, nblks);
|
| 2942 |
|
|
|
| 2943 |
|
|
/* release the cbuf, mark it as modified */
|
| 2944 |
|
|
cmPut(cp, TRUE);
|
| 2945 |
|
|
|
| 2946 |
|
|
dxaddr += nblks;
|
| 2947 |
|
|
sxaddr += nblks;
|
| 2948 |
|
|
}
|
| 2949 |
|
|
|
| 2950 |
|
|
/* get back parent page */
|
| 2951 |
|
|
if ((rc = xtSearch(ip, xoff, &cmp, &btstack, 0)))
|
| 2952 |
|
|
return rc;
|
| 2953 |
|
|
|
| 2954 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, pmp, pp, index);
|
| 2955 |
|
|
jfs_info("xtRelocate: target data extent relocated.");
|
| 2956 |
|
|
} else { /* (xtype == XTPAGE) */
|
| 2957 |
|
|
|
| 2958 |
|
|
/*
|
| 2959 |
|
|
* read in the target xtpage from the source extent;
|
| 2960 |
|
|
*/
|
| 2961 |
|
|
XT_GETPAGE(ip, oxaddr, mp, PSIZE, p, rc);
|
| 2962 |
|
|
if (rc) {
|
| 2963 |
|
|
XT_PUTPAGE(pmp);
|
| 2964 |
|
|
return rc;
|
| 2965 |
|
|
}
|
| 2966 |
|
|
|
| 2967 |
|
|
/*
|
| 2968 |
|
|
* read in sibling pages if any to update sibling pointers;
|
| 2969 |
|
|
*/
|
| 2970 |
|
|
rmp = NULL;
|
| 2971 |
|
|
if (p->header.next) {
|
| 2972 |
|
|
nextbn = le64_to_cpu(p->header.next);
|
| 2973 |
|
|
XT_GETPAGE(ip, nextbn, rmp, PSIZE, rp, rc);
|
| 2974 |
|
|
if (rc) {
|
| 2975 |
|
|
XT_PUTPAGE(pmp);
|
| 2976 |
|
|
XT_PUTPAGE(mp);
|
| 2977 |
|
|
return (rc);
|
| 2978 |
|
|
}
|
| 2979 |
|
|
}
|
| 2980 |
|
|
|
| 2981 |
|
|
lmp = NULL;
|
| 2982 |
|
|
if (p->header.prev) {
|
| 2983 |
|
|
prevbn = le64_to_cpu(p->header.prev);
|
| 2984 |
|
|
XT_GETPAGE(ip, prevbn, lmp, PSIZE, lp, rc);
|
| 2985 |
|
|
if (rc) {
|
| 2986 |
|
|
XT_PUTPAGE(pmp);
|
| 2987 |
|
|
XT_PUTPAGE(mp);
|
| 2988 |
|
|
if (rmp)
|
| 2989 |
|
|
XT_PUTPAGE(rmp);
|
| 2990 |
|
|
return (rc);
|
| 2991 |
|
|
}
|
| 2992 |
|
|
}
|
| 2993 |
|
|
|
| 2994 |
|
|
/* at this point, all xtpages to be updated are in memory */
|
| 2995 |
|
|
|
| 2996 |
|
|
/*
|
| 2997 |
|
|
* update sibling pointers of sibling xtpages if any;
|
| 2998 |
|
|
*/
|
| 2999 |
|
|
if (lmp) {
|
| 3000 |
|
|
BT_MARK_DIRTY(lmp, ip);
|
| 3001 |
|
|
tlck =
|
| 3002 |
|
|
txLock(tid, ip, lmp, tlckXTREE | tlckRELINK);
|
| 3003 |
|
|
lp->header.next = cpu_to_le64(nxaddr);
|
| 3004 |
|
|
XT_PUTPAGE(lmp);
|
| 3005 |
|
|
}
|
| 3006 |
|
|
|
| 3007 |
|
|
if (rmp) {
|
| 3008 |
|
|
BT_MARK_DIRTY(rmp, ip);
|
| 3009 |
|
|
tlck =
|
| 3010 |
|
|
txLock(tid, ip, rmp, tlckXTREE | tlckRELINK);
|
| 3011 |
|
|
rp->header.prev = cpu_to_le64(nxaddr);
|
| 3012 |
|
|
XT_PUTPAGE(rmp);
|
| 3013 |
|
|
}
|
| 3014 |
|
|
|
| 3015 |
|
|
/*
|
| 3016 |
|
|
* update the target xtpage to be relocated
|
| 3017 |
|
|
*
|
| 3018 |
|
|
* update the self address of the target page
|
| 3019 |
|
|
* and write to destination extent;
|
| 3020 |
|
|
* redo image covers the whole xtpage since it is new page
|
| 3021 |
|
|
* to the destination extent;
|
| 3022 |
|
|
* update of bmap for the free of source extent
|
| 3023 |
|
|
* of the target xtpage itself:
|
| 3024 |
|
|
* update of bmap for the allocation of destination extent
|
| 3025 |
|
|
* of the target xtpage itself:
|
| 3026 |
|
|
* update of bmap for the extents covered by xad entries in
|
| 3027 |
|
|
* the target xtpage is not necessary since they are not
|
| 3028 |
|
|
* updated;
|
| 3029 |
|
|
* if not committed before this relocation,
|
| 3030 |
|
|
* target page may contain XAD_NEW entries which must
|
| 3031 |
|
|
* be scanned for bmap update (logredo() always
|
| 3032 |
|
|
* scan xtpage REDOPAGE image for bmap update);
|
| 3033 |
|
|
* if committed before this relocation (tlckRELOCATE),
|
| 3034 |
|
|
* scan may be skipped by commit() and logredo();
|
| 3035 |
|
|
*/
|
| 3036 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3037 |
|
|
/* tlckNEW init xtlck->lwm.offset = XTENTRYSTART; */
|
| 3038 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckNEW);
|
| 3039 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 3040 |
|
|
|
| 3041 |
|
|
/* update the self address in the xtpage header */
|
| 3042 |
|
|
pxd = &p->header.self;
|
| 3043 |
|
|
PXDaddress(pxd, nxaddr);
|
| 3044 |
|
|
|
| 3045 |
|
|
/* linelock for the after image of the whole page */
|
| 3046 |
|
|
xtlck->lwm.length =
|
| 3047 |
|
|
le16_to_cpu(p->header.nextindex) - xtlck->lwm.offset;
|
| 3048 |
|
|
|
| 3049 |
|
|
/* update the buffer extent descriptor of target xtpage */
|
| 3050 |
|
|
xsize = xlen << JFS_SBI(ip->i_sb)->l2bsize;
|
| 3051 |
|
|
bmSetXD(mp, nxaddr, xsize);
|
| 3052 |
|
|
|
| 3053 |
|
|
/* unpin the target page to new homeward bound */
|
| 3054 |
|
|
XT_PUTPAGE(mp);
|
| 3055 |
|
|
jfs_info("xtRelocate: target xtpage relocated.");
|
| 3056 |
|
|
}
|
| 3057 |
|
|
|
| 3058 |
|
|
/*
|
| 3059 |
|
|
* 3. acquire maplock for the source extent to be freed;
|
| 3060 |
|
|
*
|
| 3061 |
|
|
* acquire a maplock saving the src relocated extent address;
|
| 3062 |
|
|
* to free of the extent at commit time;
|
| 3063 |
|
|
*/
|
| 3064 |
|
|
out:
|
| 3065 |
|
|
/* if DATAEXT relocation, write a LOG_UPDATEMAP record for
|
| 3066 |
|
|
* free PXD of the source data extent (logredo() will update
|
| 3067 |
|
|
* bmap for free of source data extent), and update bmap for
|
| 3068 |
|
|
* free of the source data extent;
|
| 3069 |
|
|
*/
|
| 3070 |
|
|
if (xtype == DATAEXT)
|
| 3071 |
|
|
tlck = txMaplock(tid, ip, tlckMAP);
|
| 3072 |
|
|
/* if XTPAGE relocation, write a LOG_NOREDOPAGE record
|
| 3073 |
|
|
* for the source xtpage (logredo() will init NoRedoPage
|
| 3074 |
|
|
* filter and will also update bmap for free of the source
|
| 3075 |
|
|
* xtpage), and update bmap for free of the source xtpage;
|
| 3076 |
|
|
* N.B. We use tlckMAP instead of tlkcXTREE because there
|
| 3077 |
|
|
* is no buffer associated with this lock since the buffer
|
| 3078 |
|
|
* has been redirected to the target location.
|
| 3079 |
|
|
*/
|
| 3080 |
|
|
else /* (xtype == XTPAGE) */
|
| 3081 |
|
|
tlck = txMaplock(tid, ip, tlckMAP | tlckRELOCATE);
|
| 3082 |
|
|
|
| 3083 |
|
|
pxdlock = (struct pxd_lock *) & tlck->lock;
|
| 3084 |
|
|
pxdlock->flag = mlckFREEPXD;
|
| 3085 |
|
|
PXDaddress(&pxdlock->pxd, oxaddr);
|
| 3086 |
|
|
PXDlength(&pxdlock->pxd, xlen);
|
| 3087 |
|
|
pxdlock->index = 1;
|
| 3088 |
|
|
|
| 3089 |
|
|
/*
|
| 3090 |
|
|
* 4. update the parent xad entry for relocation;
|
| 3091 |
|
|
*
|
| 3092 |
|
|
* acquire tlck for the parent entry with XAD_NEW as entry
|
| 3093 |
|
|
* update which will write LOG_REDOPAGE and update bmap for
|
| 3094 |
|
|
* allocation of XAD_NEW destination extent;
|
| 3095 |
|
|
*/
|
| 3096 |
|
|
jfs_info("xtRelocate: update parent xad entry.");
|
| 3097 |
|
|
BT_MARK_DIRTY(pmp, ip);
|
| 3098 |
|
|
tlck = txLock(tid, ip, pmp, tlckXTREE | tlckGROW);
|
| 3099 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 3100 |
|
|
|
| 3101 |
|
|
/* update the XAD with the new destination extent; */
|
| 3102 |
|
|
xad = &pp->xad[index];
|
| 3103 |
|
|
xad->flag |= XAD_NEW;
|
| 3104 |
|
|
XADaddress(xad, nxaddr);
|
| 3105 |
|
|
|
| 3106 |
|
|
xtlck->lwm.offset = min(index, xtlck->lwm.offset);
|
| 3107 |
|
|
xtlck->lwm.length = le16_to_cpu(pp->header.nextindex) -
|
| 3108 |
|
|
xtlck->lwm.offset;
|
| 3109 |
|
|
|
| 3110 |
|
|
/* unpin the parent xtpage */
|
| 3111 |
|
|
XT_PUTPAGE(pmp);
|
| 3112 |
|
|
|
| 3113 |
|
|
return rc;
|
| 3114 |
|
|
}
|
| 3115 |
|
|
|
| 3116 |
|
|
|
| 3117 |
|
|
/*
|
| 3118 |
|
|
* xtSearchNode()
|
| 3119 |
|
|
*
|
| 3120 |
|
|
* function: search for the internal xad entry covering specified extent.
|
| 3121 |
|
|
* This function is mainly used by defragfs utility.
|
| 3122 |
|
|
*
|
| 3123 |
|
|
* parameters:
|
| 3124 |
|
|
* ip - file object;
|
| 3125 |
|
|
* xad - extent to find;
|
| 3126 |
|
|
* cmpp - comparison result:
|
| 3127 |
|
|
* btstack - traverse stack;
|
| 3128 |
|
|
* flag - search process flag;
|
| 3129 |
|
|
*
|
| 3130 |
|
|
* returns:
|
| 3131 |
|
|
* btstack contains (bn, index) of search path traversed to the entry.
|
| 3132 |
|
|
* *cmpp is set to result of comparison with the entry returned.
|
| 3133 |
|
|
* the page containing the entry is pinned at exit.
|
| 3134 |
|
|
*/
|
| 3135 |
|
|
static int xtSearchNode(struct inode *ip, xad_t * xad, /* required XAD entry */
|
| 3136 |
|
|
int *cmpp, struct btstack * btstack, int flag)
|
| 3137 |
|
|
{
|
| 3138 |
|
|
int rc = 0;
|
| 3139 |
|
|
s64 xoff, xaddr;
|
| 3140 |
|
|
int xlen;
|
| 3141 |
|
|
int cmp = 1; /* init for empty page */
|
| 3142 |
|
|
s64 bn; /* block number */
|
| 3143 |
|
|
struct metapage *mp; /* meta-page buffer */
|
| 3144 |
|
|
xtpage_t *p; /* page */
|
| 3145 |
|
|
int base, index, lim;
|
| 3146 |
|
|
struct btframe *btsp;
|
| 3147 |
|
|
s64 t64;
|
| 3148 |
|
|
|
| 3149 |
|
|
BT_CLR(btstack);
|
| 3150 |
|
|
|
| 3151 |
|
|
xoff = offsetXAD(xad);
|
| 3152 |
|
|
xlen = lengthXAD(xad);
|
| 3153 |
|
|
xaddr = addressXAD(xad);
|
| 3154 |
|
|
|
| 3155 |
|
|
/*
|
| 3156 |
|
|
* search down tree from root:
|
| 3157 |
|
|
*
|
| 3158 |
|
|
* between two consecutive entries of <Ki, Pi> and <Kj, Pj> of
|
| 3159 |
|
|
* internal page, child page Pi contains entry with k, Ki <= K < Kj.
|
| 3160 |
|
|
*
|
| 3161 |
|
|
* if entry with search key K is not found
|
| 3162 |
|
|
* internal page search find the entry with largest key Ki
|
| 3163 |
|
|
* less than K which point to the child page to search;
|
| 3164 |
|
|
* leaf page search find the entry with smallest key Kj
|
| 3165 |
|
|
* greater than K so that the returned index is the position of
|
| 3166 |
|
|
* the entry to be shifted right for insertion of new entry.
|
| 3167 |
|
|
* for empty tree, search key is greater than any key of the tree.
|
| 3168 |
|
|
*
|
| 3169 |
|
|
* by convention, root bn = 0.
|
| 3170 |
|
|
*/
|
| 3171 |
|
|
for (bn = 0;;) {
|
| 3172 |
|
|
/* get/pin the page to search */
|
| 3173 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 3174 |
|
|
if (rc)
|
| 3175 |
|
|
return rc;
|
| 3176 |
|
|
if (p->header.flag & BT_LEAF) {
|
| 3177 |
|
|
XT_PUTPAGE(mp);
|
| 3178 |
|
|
return -ESTALE;
|
| 3179 |
|
|
}
|
| 3180 |
|
|
|
| 3181 |
|
|
lim = le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
| 3182 |
|
|
|
| 3183 |
|
|
/*
|
| 3184 |
|
|
* binary search with search key K on the current page
|
| 3185 |
|
|
*/
|
| 3186 |
|
|
for (base = XTENTRYSTART; lim; lim >>= 1) {
|
| 3187 |
|
|
index = base + (lim >> 1);
|
| 3188 |
|
|
|
| 3189 |
|
|
XT_CMP(cmp, xoff, &p->xad[index], t64);
|
| 3190 |
|
|
if (cmp == 0) {
|
| 3191 |
|
|
/*
|
| 3192 |
|
|
* search hit
|
| 3193 |
|
|
*
|
| 3194 |
|
|
* verify for exact match;
|
| 3195 |
|
|
*/
|
| 3196 |
|
|
if (xaddr == addressXAD(&p->xad[index]) &&
|
| 3197 |
|
|
xoff == offsetXAD(&p->xad[index])) {
|
| 3198 |
|
|
*cmpp = cmp;
|
| 3199 |
|
|
|
| 3200 |
|
|
/* save search result */
|
| 3201 |
|
|
btsp = btstack->top;
|
| 3202 |
|
|
btsp->bn = bn;
|
| 3203 |
|
|
btsp->index = index;
|
| 3204 |
|
|
btsp->mp = mp;
|
| 3205 |
|
|
|
| 3206 |
|
|
return 0;
|
| 3207 |
|
|
}
|
| 3208 |
|
|
|
| 3209 |
|
|
/* descend/search its child page */
|
| 3210 |
|
|
goto next;
|
| 3211 |
|
|
}
|
| 3212 |
|
|
|
| 3213 |
|
|
if (cmp > 0) {
|
| 3214 |
|
|
base = index + 1;
|
| 3215 |
|
|
--lim;
|
| 3216 |
|
|
}
|
| 3217 |
|
|
}
|
| 3218 |
|
|
|
| 3219 |
|
|
/*
|
| 3220 |
|
|
* search miss - non-leaf page:
|
| 3221 |
|
|
*
|
| 3222 |
|
|
* base is the smallest index with key (Kj) greater than
|
| 3223 |
|
|
* search key (K) and may be zero or maxentry index.
|
| 3224 |
|
|
* if base is non-zero, decrement base by one to get the parent
|
| 3225 |
|
|
* entry of the child page to search.
|
| 3226 |
|
|
*/
|
| 3227 |
|
|
index = base ? base - 1 : base;
|
| 3228 |
|
|
|
| 3229 |
|
|
/*
|
| 3230 |
|
|
* go down to child page
|
| 3231 |
|
|
*/
|
| 3232 |
|
|
next:
|
| 3233 |
|
|
/* get the child page block number */
|
| 3234 |
|
|
bn = addressXAD(&p->xad[index]);
|
| 3235 |
|
|
|
| 3236 |
|
|
/* unpin the parent page */
|
| 3237 |
|
|
XT_PUTPAGE(mp);
|
| 3238 |
|
|
}
|
| 3239 |
|
|
}
|
| 3240 |
|
|
|
| 3241 |
|
|
|
| 3242 |
|
|
/*
|
| 3243 |
|
|
* xtRelink()
|
| 3244 |
|
|
*
|
| 3245 |
|
|
* function:
|
| 3246 |
|
|
* link around a freed page.
|
| 3247 |
|
|
*
|
| 3248 |
|
|
* Parameter:
|
| 3249 |
|
|
* int tid,
|
| 3250 |
|
|
* struct inode *ip,
|
| 3251 |
|
|
* xtpage_t *p)
|
| 3252 |
|
|
*
|
| 3253 |
|
|
* returns:
|
| 3254 |
|
|
*/
|
| 3255 |
|
|
static int xtRelink(tid_t tid, struct inode *ip, xtpage_t * p)
|
| 3256 |
|
|
{
|
| 3257 |
|
|
int rc = 0;
|
| 3258 |
|
|
struct metapage *mp;
|
| 3259 |
|
|
s64 nextbn, prevbn;
|
| 3260 |
|
|
struct tlock *tlck;
|
| 3261 |
|
|
|
| 3262 |
|
|
nextbn = le64_to_cpu(p->header.next);
|
| 3263 |
|
|
prevbn = le64_to_cpu(p->header.prev);
|
| 3264 |
|
|
|
| 3265 |
|
|
/* update prev pointer of the next page */
|
| 3266 |
|
|
if (nextbn != 0) {
|
| 3267 |
|
|
XT_GETPAGE(ip, nextbn, mp, PSIZE, p, rc);
|
| 3268 |
|
|
if (rc)
|
| 3269 |
|
|
return rc;
|
| 3270 |
|
|
|
| 3271 |
|
|
/*
|
| 3272 |
|
|
* acquire a transaction lock on the page;
|
| 3273 |
|
|
*
|
| 3274 |
|
|
* action: update prev pointer;
|
| 3275 |
|
|
*/
|
| 3276 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3277 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
| 3278 |
|
|
|
| 3279 |
|
|
/* the page may already have been tlock'd */
|
| 3280 |
|
|
|
| 3281 |
|
|
p->header.prev = cpu_to_le64(prevbn);
|
| 3282 |
|
|
|
| 3283 |
|
|
XT_PUTPAGE(mp);
|
| 3284 |
|
|
}
|
| 3285 |
|
|
|
| 3286 |
|
|
/* update next pointer of the previous page */
|
| 3287 |
|
|
if (prevbn != 0) {
|
| 3288 |
|
|
XT_GETPAGE(ip, prevbn, mp, PSIZE, p, rc);
|
| 3289 |
|
|
if (rc)
|
| 3290 |
|
|
return rc;
|
| 3291 |
|
|
|
| 3292 |
|
|
/*
|
| 3293 |
|
|
* acquire a transaction lock on the page;
|
| 3294 |
|
|
*
|
| 3295 |
|
|
* action: update next pointer;
|
| 3296 |
|
|
*/
|
| 3297 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3298 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE | tlckRELINK);
|
| 3299 |
|
|
|
| 3300 |
|
|
/* the page may already have been tlock'd */
|
| 3301 |
|
|
|
| 3302 |
|
|
p->header.next = le64_to_cpu(nextbn);
|
| 3303 |
|
|
|
| 3304 |
|
|
XT_PUTPAGE(mp);
|
| 3305 |
|
|
}
|
| 3306 |
|
|
|
| 3307 |
|
|
return 0;
|
| 3308 |
|
|
}
|
| 3309 |
|
|
#endif /* _STILL_TO_PORT */
|
| 3310 |
|
|
|
| 3311 |
|
|
|
| 3312 |
|
|
/*
|
| 3313 |
|
|
* xtInitRoot()
|
| 3314 |
|
|
*
|
| 3315 |
|
|
* initialize file root (inline in inode)
|
| 3316 |
|
|
*/
|
| 3317 |
|
|
void xtInitRoot(tid_t tid, struct inode *ip)
|
| 3318 |
|
|
{
|
| 3319 |
|
|
xtpage_t *p;
|
| 3320 |
|
|
|
| 3321 |
|
|
/*
|
| 3322 |
|
|
* acquire a transaction lock on the root
|
| 3323 |
|
|
*
|
| 3324 |
|
|
* action:
|
| 3325 |
|
|
*/
|
| 3326 |
|
|
txLock(tid, ip, (struct metapage *) &JFS_IP(ip)->bxflag,
|
| 3327 |
|
|
tlckXTREE | tlckNEW);
|
| 3328 |
|
|
p = &JFS_IP(ip)->i_xtroot;
|
| 3329 |
|
|
|
| 3330 |
|
|
p->header.flag = DXD_INDEX | BT_ROOT | BT_LEAF;
|
| 3331 |
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 3332 |
|
|
|
| 3333 |
|
|
if (S_ISDIR(ip->i_mode))
|
| 3334 |
|
|
p->header.maxentry = cpu_to_le16(XTROOTINITSLOT_DIR);
|
| 3335 |
|
|
else {
|
| 3336 |
|
|
p->header.maxentry = cpu_to_le16(XTROOTINITSLOT);
|
| 3337 |
|
|
ip->i_size = 0;
|
| 3338 |
|
|
}
|
| 3339 |
|
|
|
| 3340 |
|
|
|
| 3341 |
|
|
return;
|
| 3342 |
|
|
}
|
| 3343 |
|
|
|
| 3344 |
|
|
|
| 3345 |
|
|
/*
|
| 3346 |
|
|
* We can run into a deadlock truncating a file with a large number of
|
| 3347 |
|
|
* xtree pages (large fragmented file). A robust fix would entail a
|
| 3348 |
|
|
* reservation system where we would reserve a number of metadata pages
|
| 3349 |
|
|
* and tlocks which we would be guaranteed without a deadlock. Without
|
| 3350 |
|
|
* this, a partial fix is to limit number of metadata pages we will lock
|
| 3351 |
|
|
* in a single transaction. Currently we will truncate the file so that
|
| 3352 |
|
|
* no more than 50 leaf pages will be locked. The caller of xtTruncate
|
| 3353 |
|
|
* will be responsible for ensuring that the current transaction gets
|
| 3354 |
|
|
* committed, and that subsequent transactions are created to truncate
|
| 3355 |
|
|
* the file further if needed.
|
| 3356 |
|
|
*/
|
| 3357 |
|
|
#define MAX_TRUNCATE_LEAVES 50
|
| 3358 |
|
|
|
| 3359 |
|
|
/*
|
| 3360 |
|
|
* xtTruncate()
|
| 3361 |
|
|
*
|
| 3362 |
|
|
* function:
|
| 3363 |
|
|
* traverse for truncation logging backward bottom up;
|
| 3364 |
|
|
* terminate at the last extent entry at the current subtree
|
| 3365 |
|
|
* root page covering new down size.
|
| 3366 |
|
|
* truncation may occur within the last extent entry.
|
| 3367 |
|
|
*
|
| 3368 |
|
|
* parameter:
|
| 3369 |
|
|
* int tid,
|
| 3370 |
|
|
* struct inode *ip,
|
| 3371 |
|
|
* s64 newsize,
|
| 3372 |
|
|
* int type) {PWMAP, PMAP, WMAP; DELETE, TRUNCATE}
|
| 3373 |
|
|
*
|
| 3374 |
|
|
* return:
|
| 3375 |
|
|
*
|
| 3376 |
|
|
* note:
|
| 3377 |
|
|
* PWMAP:
|
| 3378 |
|
|
* 1. truncate (non-COMMIT_NOLINK file)
|
| 3379 |
|
|
* by jfs_truncate() or jfs_open(O_TRUNC):
|
| 3380 |
|
|
* xtree is updated;
|
| 3381 |
|
|
* 2. truncate index table of directory when last entry removed
|
| 3382 |
|
|
* map update via tlock at commit time;
|
| 3383 |
|
|
* PMAP:
|
| 3384 |
|
|
* Call xtTruncate_pmap instead
|
| 3385 |
|
|
* WMAP:
|
| 3386 |
|
|
* 1. remove (free zero link count) on last reference release
|
| 3387 |
|
|
* (pmap has been freed at commit zero link count);
|
| 3388 |
|
|
* 2. truncate (COMMIT_NOLINK file, i.e., tmp file):
|
| 3389 |
|
|
* xtree is updated;
|
| 3390 |
|
|
* map update directly at truncation time;
|
| 3391 |
|
|
*
|
| 3392 |
|
|
* if (DELETE)
|
| 3393 |
|
|
* no LOG_NOREDOPAGE is required (NOREDOFILE is sufficient);
|
| 3394 |
|
|
* else if (TRUNCATE)
|
| 3395 |
|
|
* must write LOG_NOREDOPAGE for deleted index page;
|
| 3396 |
|
|
*
|
| 3397 |
|
|
* pages may already have been tlocked by anonymous transactions
|
| 3398 |
|
|
* during file growth (i.e., write) before truncation;
|
| 3399 |
|
|
*
|
| 3400 |
|
|
* except last truncated entry, deleted entries remains as is
|
| 3401 |
|
|
* in the page (nextindex is updated) for other use
|
| 3402 |
|
|
* (e.g., log/update allocation map): this avoid copying the page
|
| 3403 |
|
|
* info but delay free of pages;
|
| 3404 |
|
|
*
|
| 3405 |
|
|
*/
|
| 3406 |
|
|
s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int flag)
|
| 3407 |
|
|
{
|
| 3408 |
|
|
int rc = 0;
|
| 3409 |
|
|
s64 teof;
|
| 3410 |
|
|
struct metapage *mp;
|
| 3411 |
|
|
xtpage_t *p;
|
| 3412 |
|
|
s64 bn;
|
| 3413 |
|
|
int index, nextindex;
|
| 3414 |
|
|
xad_t *xad;
|
| 3415 |
|
|
s64 xoff, xaddr;
|
| 3416 |
|
|
int xlen, len, freexlen;
|
| 3417 |
|
|
struct btstack btstack;
|
| 3418 |
|
|
struct btframe *parent;
|
| 3419 |
|
|
struct tblock *tblk = 0;
|
| 3420 |
|
|
struct tlock *tlck = 0;
|
| 3421 |
|
|
struct xtlock *xtlck = 0;
|
| 3422 |
|
|
struct xdlistlock xadlock; /* maplock for COMMIT_WMAP */
|
| 3423 |
|
|
struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
|
| 3424 |
|
|
s64 nfreed;
|
| 3425 |
|
|
int freed, log;
|
| 3426 |
|
|
int locked_leaves = 0;
|
| 3427 |
|
|
|
| 3428 |
|
|
/* save object truncation type */
|
| 3429 |
|
|
if (tid) {
|
| 3430 |
|
|
tblk = tid_to_tblock(tid);
|
| 3431 |
|
|
tblk->xflag |= flag;
|
| 3432 |
|
|
}
|
| 3433 |
|
|
|
| 3434 |
|
|
nfreed = 0;
|
| 3435 |
|
|
|
| 3436 |
|
|
flag &= COMMIT_MAP;
|
| 3437 |
|
|
assert(flag != COMMIT_PMAP);
|
| 3438 |
|
|
|
| 3439 |
|
|
if (flag == COMMIT_PWMAP)
|
| 3440 |
|
|
log = 1;
|
| 3441 |
|
|
else {
|
| 3442 |
|
|
log = 0;
|
| 3443 |
|
|
xadlock.flag = mlckFREEXADLIST;
|
| 3444 |
|
|
xadlock.index = 1;
|
| 3445 |
|
|
}
|
| 3446 |
|
|
|
| 3447 |
|
|
/*
|
| 3448 |
|
|
* if the newsize is not an integral number of pages,
|
| 3449 |
|
|
* the file between newsize and next page boundary will
|
| 3450 |
|
|
* be cleared.
|
| 3451 |
|
|
* if truncating into a file hole, it will cause
|
| 3452 |
|
|
* a full block to be allocated for the logical block.
|
| 3453 |
|
|
*/
|
| 3454 |
|
|
|
| 3455 |
|
|
/*
|
| 3456 |
|
|
* release page blocks of truncated region <teof, eof>
|
| 3457 |
|
|
*
|
| 3458 |
|
|
* free the data blocks from the leaf index blocks.
|
| 3459 |
|
|
* delete the parent index entries corresponding to
|
| 3460 |
|
|
* the freed child data/index blocks.
|
| 3461 |
|
|
* free the index blocks themselves which aren't needed
|
| 3462 |
|
|
* in new sized file.
|
| 3463 |
|
|
*
|
| 3464 |
|
|
* index blocks are updated only if the blocks are to be
|
| 3465 |
|
|
* retained in the new sized file.
|
| 3466 |
|
|
* if type is PMAP, the data and index pages are NOT
|
| 3467 |
|
|
* freed, and the data and index blocks are NOT freed
|
| 3468 |
|
|
* from working map.
|
| 3469 |
|
|
* (this will allow continued access of data/index of
|
| 3470 |
|
|
* temporary file (zerolink count file truncated to zero-length)).
|
| 3471 |
|
|
*/
|
| 3472 |
|
|
teof = (newsize + (JFS_SBI(ip->i_sb)->bsize - 1)) >>
|
| 3473 |
|
|
JFS_SBI(ip->i_sb)->l2bsize;
|
| 3474 |
|
|
|
| 3475 |
|
|
/* clear stack */
|
| 3476 |
|
|
BT_CLR(&btstack);
|
| 3477 |
|
|
|
| 3478 |
|
|
/*
|
| 3479 |
|
|
* start with root
|
| 3480 |
|
|
*
|
| 3481 |
|
|
* root resides in the inode
|
| 3482 |
|
|
*/
|
| 3483 |
|
|
bn = 0;
|
| 3484 |
|
|
|
| 3485 |
|
|
/*
|
| 3486 |
|
|
* first access of each page:
|
| 3487 |
|
|
*/
|
| 3488 |
|
|
getPage:
|
| 3489 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 3490 |
|
|
if (rc)
|
| 3491 |
|
|
return rc;
|
| 3492 |
|
|
|
| 3493 |
|
|
/* process entries backward from last index */
|
| 3494 |
|
|
index = le16_to_cpu(p->header.nextindex) - 1;
|
| 3495 |
|
|
|
| 3496 |
|
|
if (p->header.flag & BT_INTERNAL)
|
| 3497 |
|
|
goto getChild;
|
| 3498 |
|
|
|
| 3499 |
|
|
/*
|
| 3500 |
|
|
* leaf page
|
| 3501 |
|
|
*/
|
| 3502 |
|
|
|
| 3503 |
|
|
/* Since this is the rightmost leaf, and we may have already freed
|
| 3504 |
|
|
* a page that was formerly to the right, let's make sure that the
|
| 3505 |
|
|
* next pointer is zero.
|
| 3506 |
|
|
*/
|
| 3507 |
|
|
p->header.next = 0;
|
| 3508 |
|
|
|
| 3509 |
|
|
freed = 0;
|
| 3510 |
|
|
|
| 3511 |
|
|
/* does region covered by leaf page precede Teof ? */
|
| 3512 |
|
|
xad = &p->xad[index];
|
| 3513 |
|
|
xoff = offsetXAD(xad);
|
| 3514 |
|
|
xlen = lengthXAD(xad);
|
| 3515 |
|
|
if (teof >= xoff + xlen) {
|
| 3516 |
|
|
XT_PUTPAGE(mp);
|
| 3517 |
|
|
goto getParent;
|
| 3518 |
|
|
}
|
| 3519 |
|
|
|
| 3520 |
|
|
/* (re)acquire tlock of the leaf page */
|
| 3521 |
|
|
if (log) {
|
| 3522 |
|
|
if (++locked_leaves > MAX_TRUNCATE_LEAVES) {
|
| 3523 |
|
|
/*
|
| 3524 |
|
|
* We need to limit the size of the transaction
|
| 3525 |
|
|
* to avoid exhausting pagecache & tlocks
|
| 3526 |
|
|
*/
|
| 3527 |
|
|
XT_PUTPAGE(mp);
|
| 3528 |
|
|
newsize = (xoff + xlen) << JFS_SBI(ip->i_sb)->l2bsize;
|
| 3529 |
|
|
goto getParent;
|
| 3530 |
|
|
}
|
| 3531 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 3532 |
|
|
tlck->type = tlckXTREE | tlckTRUNCATE;
|
| 3533 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 3534 |
|
|
xtlck->hwm.offset = le16_to_cpu(p->header.nextindex) - 1;
|
| 3535 |
|
|
}
|
| 3536 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3537 |
|
|
|
| 3538 |
|
|
/*
|
| 3539 |
|
|
* scan backward leaf page entries
|
| 3540 |
|
|
*/
|
| 3541 |
|
|
for (; index >= XTENTRYSTART; index--) {
|
| 3542 |
|
|
xad = &p->xad[index];
|
| 3543 |
|
|
xoff = offsetXAD(xad);
|
| 3544 |
|
|
xlen = lengthXAD(xad);
|
| 3545 |
|
|
xaddr = addressXAD(xad);
|
| 3546 |
|
|
|
| 3547 |
|
|
/*
|
| 3548 |
|
|
* The "data" for a directory is indexed by the block
|
| 3549 |
|
|
* device's address space. This metadata must be invalidated
|
| 3550 |
|
|
* here
|
| 3551 |
|
|
*/
|
| 3552 |
|
|
if (S_ISDIR(ip->i_mode) && (teof == 0))
|
| 3553 |
|
|
invalidate_xad_metapages(ip, *xad);
|
| 3554 |
|
|
/*
|
| 3555 |
|
|
* entry beyond eof: continue scan of current page
|
| 3556 |
|
|
* xad
|
| 3557 |
|
|
* ---|---=======------->
|
| 3558 |
|
|
* eof
|
| 3559 |
|
|
*/
|
| 3560 |
|
|
if (teof < xoff) {
|
| 3561 |
|
|
nfreed += xlen;
|
| 3562 |
|
|
continue;
|
| 3563 |
|
|
}
|
| 3564 |
|
|
|
| 3565 |
|
|
/*
|
| 3566 |
|
|
* (xoff <= teof): last entry to be deleted from page;
|
| 3567 |
|
|
* If other entries remain in page: keep and update the page.
|
| 3568 |
|
|
*/
|
| 3569 |
|
|
|
| 3570 |
|
|
/*
|
| 3571 |
|
|
* eof == entry_start: delete the entry
|
| 3572 |
|
|
* xad
|
| 3573 |
|
|
* -------|=======------->
|
| 3574 |
|
|
* eof
|
| 3575 |
|
|
*
|
| 3576 |
|
|
*/
|
| 3577 |
|
|
if (teof == xoff) {
|
| 3578 |
|
|
nfreed += xlen;
|
| 3579 |
|
|
|
| 3580 |
|
|
if (index == XTENTRYSTART)
|
| 3581 |
|
|
break;
|
| 3582 |
|
|
|
| 3583 |
|
|
nextindex = index;
|
| 3584 |
|
|
}
|
| 3585 |
|
|
/*
|
| 3586 |
|
|
* eof within the entry: truncate the entry.
|
| 3587 |
|
|
* xad
|
| 3588 |
|
|
* -------===|===------->
|
| 3589 |
|
|
* eof
|
| 3590 |
|
|
*/
|
| 3591 |
|
|
else if (teof < xoff + xlen) {
|
| 3592 |
|
|
/* update truncated entry */
|
| 3593 |
|
|
len = teof - xoff;
|
| 3594 |
|
|
freexlen = xlen - len;
|
| 3595 |
|
|
XADlength(xad, len);
|
| 3596 |
|
|
|
| 3597 |
|
|
/* save pxd of truncated extent in tlck */
|
| 3598 |
|
|
xaddr += len;
|
| 3599 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3600 |
|
|
xtlck->lwm.offset = (xtlck->lwm.offset) ?
|
| 3601 |
|
|
min(index, (int)xtlck->lwm.offset) : index;
|
| 3602 |
|
|
xtlck->lwm.length = index + 1 -
|
| 3603 |
|
|
xtlck->lwm.offset;
|
| 3604 |
|
|
xtlck->twm.offset = index;
|
| 3605 |
|
|
pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
|
| 3606 |
|
|
pxdlock->flag = mlckFREEPXD;
|
| 3607 |
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
| 3608 |
|
|
PXDlength(&pxdlock->pxd, freexlen);
|
| 3609 |
|
|
}
|
| 3610 |
|
|
/* free truncated extent */
|
| 3611 |
|
|
else { /* COMMIT_WMAP */
|
| 3612 |
|
|
|
| 3613 |
|
|
pxdlock = (struct pxd_lock *) & xadlock;
|
| 3614 |
|
|
pxdlock->flag = mlckFREEPXD;
|
| 3615 |
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
| 3616 |
|
|
PXDlength(&pxdlock->pxd, freexlen);
|
| 3617 |
|
|
txFreeMap(ip, pxdlock, 0, COMMIT_WMAP);
|
| 3618 |
|
|
|
| 3619 |
|
|
/* reset map lock */
|
| 3620 |
|
|
xadlock.flag = mlckFREEXADLIST;
|
| 3621 |
|
|
}
|
| 3622 |
|
|
|
| 3623 |
|
|
/* current entry is new last entry; */
|
| 3624 |
|
|
nextindex = index + 1;
|
| 3625 |
|
|
|
| 3626 |
|
|
nfreed += freexlen;
|
| 3627 |
|
|
}
|
| 3628 |
|
|
/*
|
| 3629 |
|
|
* eof beyond the entry:
|
| 3630 |
|
|
* xad
|
| 3631 |
|
|
* -------=======---|--->
|
| 3632 |
|
|
* eof
|
| 3633 |
|
|
*/
|
| 3634 |
|
|
else { /* (xoff + xlen < teof) */
|
| 3635 |
|
|
|
| 3636 |
|
|
nextindex = index + 1;
|
| 3637 |
|
|
}
|
| 3638 |
|
|
|
| 3639 |
|
|
if (nextindex < le16_to_cpu(p->header.nextindex)) {
|
| 3640 |
|
|
if (!log) { /* COMMIT_WAMP */
|
| 3641 |
|
|
xadlock.xdlist = &p->xad[nextindex];
|
| 3642 |
|
|
xadlock.count =
|
| 3643 |
|
|
le16_to_cpu(p->header.nextindex) -
|
| 3644 |
|
|
nextindex;
|
| 3645 |
|
|
txFreeMap(ip, (struct maplock *) & xadlock, 0,
|
| 3646 |
|
|
COMMIT_WMAP);
|
| 3647 |
|
|
}
|
| 3648 |
|
|
p->header.nextindex = cpu_to_le16(nextindex);
|
| 3649 |
|
|
}
|
| 3650 |
|
|
|
| 3651 |
|
|
XT_PUTPAGE(mp);
|
| 3652 |
|
|
|
| 3653 |
|
|
/* assert(freed == 0); */
|
| 3654 |
|
|
goto getParent;
|
| 3655 |
|
|
} /* end scan of leaf page entries */
|
| 3656 |
|
|
|
| 3657 |
|
|
freed = 1;
|
| 3658 |
|
|
|
| 3659 |
|
|
/*
|
| 3660 |
|
|
* leaf page become empty: free the page if type != PMAP
|
| 3661 |
|
|
*/
|
| 3662 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3663 |
|
|
/* txCommit() with tlckFREE:
|
| 3664 |
|
|
* free data extents covered by leaf [XTENTRYSTART:hwm);
|
| 3665 |
|
|
* invalidate leaf if COMMIT_PWMAP;
|
| 3666 |
|
|
* if (TRUNCATE), will write LOG_NOREDOPAGE;
|
| 3667 |
|
|
*/
|
| 3668 |
|
|
tlck->type = tlckXTREE | tlckFREE;
|
| 3669 |
|
|
} else { /* COMMIT_WAMP */
|
| 3670 |
|
|
|
| 3671 |
|
|
/* free data extents covered by leaf */
|
| 3672 |
|
|
xadlock.xdlist = &p->xad[XTENTRYSTART];
|
| 3673 |
|
|
xadlock.count =
|
| 3674 |
|
|
le16_to_cpu(p->header.nextindex) - XTENTRYSTART;
|
| 3675 |
|
|
txFreeMap(ip, (struct maplock *) & xadlock, 0, COMMIT_WMAP);
|
| 3676 |
|
|
}
|
| 3677 |
|
|
|
| 3678 |
|
|
if (p->header.flag & BT_ROOT) {
|
| 3679 |
|
|
p->header.flag &= ~BT_INTERNAL;
|
| 3680 |
|
|
p->header.flag |= BT_LEAF;
|
| 3681 |
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 3682 |
|
|
|
| 3683 |
|
|
XT_PUTPAGE(mp); /* debug */
|
| 3684 |
|
|
goto out;
|
| 3685 |
|
|
} else {
|
| 3686 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3687 |
|
|
/* page will be invalidated at tx completion
|
| 3688 |
|
|
*/
|
| 3689 |
|
|
XT_PUTPAGE(mp);
|
| 3690 |
|
|
} else { /* COMMIT_WMAP */
|
| 3691 |
|
|
|
| 3692 |
|
|
if (mp->lid)
|
| 3693 |
|
|
lid_to_tlock(mp->lid)->flag |= tlckFREELOCK;
|
| 3694 |
|
|
|
| 3695 |
|
|
/* invalidate empty leaf page */
|
| 3696 |
|
|
discard_metapage(mp);
|
| 3697 |
|
|
}
|
| 3698 |
|
|
}
|
| 3699 |
|
|
|
| 3700 |
|
|
/*
|
| 3701 |
|
|
* the leaf page become empty: delete the parent entry
|
| 3702 |
|
|
* for the leaf page if the parent page is to be kept
|
| 3703 |
|
|
* in the new sized file.
|
| 3704 |
|
|
*/
|
| 3705 |
|
|
|
| 3706 |
|
|
/*
|
| 3707 |
|
|
* go back up to the parent page
|
| 3708 |
|
|
*/
|
| 3709 |
|
|
getParent:
|
| 3710 |
|
|
/* pop/restore parent entry for the current child page */
|
| 3711 |
|
|
if ((parent = BT_POP(&btstack)) == NULL)
|
| 3712 |
|
|
/* current page must have been root */
|
| 3713 |
|
|
goto out;
|
| 3714 |
|
|
|
| 3715 |
|
|
/* get back the parent page */
|
| 3716 |
|
|
bn = parent->bn;
|
| 3717 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 3718 |
|
|
if (rc)
|
| 3719 |
|
|
return rc;
|
| 3720 |
|
|
|
| 3721 |
|
|
index = parent->index;
|
| 3722 |
|
|
|
| 3723 |
|
|
/*
|
| 3724 |
|
|
* child page was not empty:
|
| 3725 |
|
|
*/
|
| 3726 |
|
|
if (freed == 0) {
|
| 3727 |
|
|
/* has any entry deleted from parent ? */
|
| 3728 |
|
|
if (index < le16_to_cpu(p->header.nextindex) - 1) {
|
| 3729 |
|
|
/* (re)acquire tlock on the parent page */
|
| 3730 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3731 |
|
|
/* txCommit() with tlckTRUNCATE:
|
| 3732 |
|
|
* free child extents covered by parent [);
|
| 3733 |
|
|
*/
|
| 3734 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 3735 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 3736 |
|
|
if (!(tlck->type & tlckTRUNCATE)) {
|
| 3737 |
|
|
xtlck->hwm.offset =
|
| 3738 |
|
|
le16_to_cpu(p->header.
|
| 3739 |
|
|
nextindex) - 1;
|
| 3740 |
|
|
tlck->type =
|
| 3741 |
|
|
tlckXTREE | tlckTRUNCATE;
|
| 3742 |
|
|
}
|
| 3743 |
|
|
} else { /* COMMIT_WMAP */
|
| 3744 |
|
|
|
| 3745 |
|
|
/* free child extents covered by parent */
|
| 3746 |
|
|
xadlock.xdlist = &p->xad[index + 1];
|
| 3747 |
|
|
xadlock.count =
|
| 3748 |
|
|
le16_to_cpu(p->header.nextindex) -
|
| 3749 |
|
|
index - 1;
|
| 3750 |
|
|
txFreeMap(ip, (struct maplock *) & xadlock, 0,
|
| 3751 |
|
|
COMMIT_WMAP);
|
| 3752 |
|
|
}
|
| 3753 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3754 |
|
|
|
| 3755 |
|
|
p->header.nextindex = cpu_to_le16(index + 1);
|
| 3756 |
|
|
}
|
| 3757 |
|
|
XT_PUTPAGE(mp);
|
| 3758 |
|
|
goto getParent;
|
| 3759 |
|
|
}
|
| 3760 |
|
|
|
| 3761 |
|
|
/*
|
| 3762 |
|
|
* child page was empty:
|
| 3763 |
|
|
*/
|
| 3764 |
|
|
nfreed += lengthXAD(&p->xad[index]);
|
| 3765 |
|
|
|
| 3766 |
|
|
/*
|
| 3767 |
|
|
* During working map update, child page's tlock must be handled
|
| 3768 |
|
|
* before parent's. This is because the parent's tlock will cause
|
| 3769 |
|
|
* the child's disk space to be marked available in the wmap, so
|
| 3770 |
|
|
* it's important that the child page be released by that time.
|
| 3771 |
|
|
*
|
| 3772 |
|
|
* ToDo: tlocks should be on doubly-linked list, so we can
|
| 3773 |
|
|
* quickly remove it and add it to the end.
|
| 3774 |
|
|
*/
|
| 3775 |
|
|
|
| 3776 |
|
|
/*
|
| 3777 |
|
|
* Move parent page's tlock to the end of the tid's tlock list
|
| 3778 |
|
|
*/
|
| 3779 |
|
|
if (log && mp->lid && (tblk->last != mp->lid) &&
|
| 3780 |
|
|
lid_to_tlock(mp->lid)->tid) {
|
| 3781 |
|
|
lid_t lid = mp->lid;
|
| 3782 |
|
|
struct tlock *prev;
|
| 3783 |
|
|
|
| 3784 |
|
|
tlck = lid_to_tlock(lid);
|
| 3785 |
|
|
|
| 3786 |
|
|
if (tblk->next == lid)
|
| 3787 |
|
|
tblk->next = tlck->next;
|
| 3788 |
|
|
else {
|
| 3789 |
|
|
for (prev = lid_to_tlock(tblk->next);
|
| 3790 |
|
|
prev->next != lid;
|
| 3791 |
|
|
prev = lid_to_tlock(prev->next)) {
|
| 3792 |
|
|
assert(prev->next);
|
| 3793 |
|
|
}
|
| 3794 |
|
|
prev->next = tlck->next;
|
| 3795 |
|
|
}
|
| 3796 |
|
|
lid_to_tlock(tblk->last)->next = lid;
|
| 3797 |
|
|
tlck->next = 0;
|
| 3798 |
|
|
tblk->last = lid;
|
| 3799 |
|
|
}
|
| 3800 |
|
|
|
| 3801 |
|
|
/*
|
| 3802 |
|
|
* parent page become empty: free the page
|
| 3803 |
|
|
*/
|
| 3804 |
|
|
if (index == XTENTRYSTART) {
|
| 3805 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3806 |
|
|
/* txCommit() with tlckFREE:
|
| 3807 |
|
|
* free child extents covered by parent;
|
| 3808 |
|
|
* invalidate parent if COMMIT_PWMAP;
|
| 3809 |
|
|
*/
|
| 3810 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 3811 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 3812 |
|
|
xtlck->hwm.offset =
|
| 3813 |
|
|
le16_to_cpu(p->header.nextindex) - 1;
|
| 3814 |
|
|
tlck->type = tlckXTREE | tlckFREE;
|
| 3815 |
|
|
} else { /* COMMIT_WMAP */
|
| 3816 |
|
|
|
| 3817 |
|
|
/* free child extents covered by parent */
|
| 3818 |
|
|
xadlock.xdlist = &p->xad[XTENTRYSTART];
|
| 3819 |
|
|
xadlock.count =
|
| 3820 |
|
|
le16_to_cpu(p->header.nextindex) -
|
| 3821 |
|
|
XTENTRYSTART;
|
| 3822 |
|
|
txFreeMap(ip, (struct maplock *) & xadlock, 0,
|
| 3823 |
|
|
COMMIT_WMAP);
|
| 3824 |
|
|
}
|
| 3825 |
|
|
BT_MARK_DIRTY(mp, ip);
|
| 3826 |
|
|
|
| 3827 |
|
|
if (p->header.flag & BT_ROOT) {
|
| 3828 |
|
|
p->header.flag &= ~BT_INTERNAL;
|
| 3829 |
|
|
p->header.flag |= BT_LEAF;
|
| 3830 |
|
|
p->header.nextindex = cpu_to_le16(XTENTRYSTART);
|
| 3831 |
|
|
if (le16_to_cpu(p->header.maxentry) == XTROOTMAXSLOT) {
|
| 3832 |
|
|
/*
|
| 3833 |
|
|
* Shrink root down to allow inline
|
| 3834 |
|
|
* EA (otherwise fsck complains)
|
| 3835 |
|
|
*/
|
| 3836 |
|
|
p->header.maxentry =
|
| 3837 |
|
|
cpu_to_le16(XTROOTINITSLOT);
|
| 3838 |
|
|
JFS_IP(ip)->mode2 |= INLINEEA;
|
| 3839 |
|
|
}
|
| 3840 |
|
|
|
| 3841 |
|
|
XT_PUTPAGE(mp); /* debug */
|
| 3842 |
|
|
goto out;
|
| 3843 |
|
|
} else {
|
| 3844 |
|
|
if (log) { /* COMMIT_PWMAP */
|
| 3845 |
|
|
/* page will be invalidated at tx completion
|
| 3846 |
|
|
*/
|
| 3847 |
|
|
XT_PUTPAGE(mp);
|
| 3848 |
|
|
} else { /* COMMIT_WMAP */
|
| 3849 |
|
|
|
| 3850 |
|
|
if (mp->lid)
|
| 3851 |
|
|
lid_to_tlock(mp->lid)->flag |=
|
| 3852 |
|
|
tlckFREELOCK;
|
| 3853 |
|
|
|
| 3854 |
|
|
/* invalidate parent page */
|
| 3855 |
|
|
discard_metapage(mp);
|
| 3856 |
|
|
}
|
| 3857 |
|
|
|
| 3858 |
|
|
/* parent has become empty and freed:
|
| 3859 |
|
|
* go back up to its parent page
|
| 3860 |
|
|
*/
|
| 3861 |
|
|
/* freed = 1; */
|
| 3862 |
|
|
goto getParent;
|
| 3863 |
|
|
}
|
| 3864 |
|
|
}
|
| 3865 |
|
|
/*
|
| 3866 |
|
|
* parent page still has entries for front region;
|
| 3867 |
|
|
*/
|
| 3868 |
|
|
else {
|
| 3869 |
|
|
/* try truncate region covered by preceding entry
|
| 3870 |
|
|
* (process backward)
|
| 3871 |
|
|
*/
|
| 3872 |
|
|
index--;
|
| 3873 |
|
|
|
| 3874 |
|
|
/* go back down to the child page corresponding
|
| 3875 |
|
|
* to the entry
|
| 3876 |
|
|
*/
|
| 3877 |
|
|
goto getChild;
|
| 3878 |
|
|
}
|
| 3879 |
|
|
|
| 3880 |
|
|
/*
|
| 3881 |
|
|
* internal page: go down to child page of current entry
|
| 3882 |
|
|
*/
|
| 3883 |
|
|
getChild:
|
| 3884 |
|
|
/* save current parent entry for the child page */
|
| 3885 |
|
|
BT_PUSH(&btstack, bn, index);
|
| 3886 |
|
|
|
| 3887 |
|
|
/* get child page */
|
| 3888 |
|
|
xad = &p->xad[index];
|
| 3889 |
|
|
bn = addressXAD(xad);
|
| 3890 |
|
|
|
| 3891 |
|
|
/*
|
| 3892 |
|
|
* first access of each internal entry:
|
| 3893 |
|
|
*/
|
| 3894 |
|
|
/* release parent page */
|
| 3895 |
|
|
XT_PUTPAGE(mp);
|
| 3896 |
|
|
|
| 3897 |
|
|
/* process the child page */
|
| 3898 |
|
|
goto getPage;
|
| 3899 |
|
|
|
| 3900 |
|
|
out:
|
| 3901 |
|
|
/*
|
| 3902 |
|
|
* update file resource stat
|
| 3903 |
|
|
*/
|
| 3904 |
|
|
/* set size
|
| 3905 |
|
|
*/
|
| 3906 |
|
|
if (S_ISDIR(ip->i_mode) && !newsize)
|
| 3907 |
|
|
ip->i_size = 1; /* fsck hates zero-length directories */
|
| 3908 |
|
|
else
|
| 3909 |
|
|
ip->i_size = newsize;
|
| 3910 |
|
|
|
| 3911 |
|
|
/* update nblocks to reflect freed blocks */
|
| 3912 |
|
|
ip->i_blocks -= LBLK2PBLK(ip->i_sb, nfreed);
|
| 3913 |
|
|
|
| 3914 |
|
|
/*
|
| 3915 |
|
|
* free tlock of invalidated pages
|
| 3916 |
|
|
*/
|
| 3917 |
|
|
if (flag == COMMIT_WMAP)
|
| 3918 |
|
|
txFreelock(ip);
|
| 3919 |
|
|
|
| 3920 |
|
|
return newsize;
|
| 3921 |
|
|
}
|
| 3922 |
|
|
|
| 3923 |
|
|
|
| 3924 |
|
|
/*
|
| 3925 |
|
|
* xtTruncate_pmap()
|
| 3926 |
|
|
*
|
| 3927 |
|
|
* function:
|
| 3928 |
|
|
* Perform truncate to zero lenghth for deleted file, leaving the
|
| 3929 |
|
|
* the xtree and working map untouched. This allows the file to
|
| 3930 |
|
|
* be accessed via open file handles, while the delete of the file
|
| 3931 |
|
|
* is committed to disk.
|
| 3932 |
|
|
*
|
| 3933 |
|
|
* parameter:
|
| 3934 |
|
|
* tid_t tid,
|
| 3935 |
|
|
* struct inode *ip,
|
| 3936 |
|
|
* s64 committed_size)
|
| 3937 |
|
|
*
|
| 3938 |
|
|
* return: new committed size
|
| 3939 |
|
|
*
|
| 3940 |
|
|
* note:
|
| 3941 |
|
|
*
|
| 3942 |
|
|
* To avoid deadlock by holding too many transaction locks, the
|
| 3943 |
|
|
* truncation may be broken up into multiple transactions.
|
| 3944 |
|
|
* The committed_size keeps track of part of the file has been
|
| 3945 |
|
|
* freed from the pmaps.
|
| 3946 |
|
|
*/
|
| 3947 |
|
|
s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size)
|
| 3948 |
|
|
{
|
| 3949 |
|
|
s64 bn;
|
| 3950 |
|
|
struct btstack btstack;
|
| 3951 |
|
|
int cmp;
|
| 3952 |
|
|
int index;
|
| 3953 |
|
|
int locked_leaves = 0;
|
| 3954 |
|
|
struct metapage *mp;
|
| 3955 |
|
|
xtpage_t *p;
|
| 3956 |
|
|
struct btframe *parent;
|
| 3957 |
|
|
int rc;
|
| 3958 |
|
|
struct tblock *tblk;
|
| 3959 |
|
|
struct tlock *tlck = 0;
|
| 3960 |
|
|
xad_t *xad;
|
| 3961 |
|
|
int xlen;
|
| 3962 |
|
|
s64 xoff;
|
| 3963 |
|
|
struct xtlock *xtlck = 0;
|
| 3964 |
|
|
|
| 3965 |
|
|
/* save object truncation type */
|
| 3966 |
|
|
tblk = tid_to_tblock(tid);
|
| 3967 |
|
|
tblk->xflag |= COMMIT_PMAP;
|
| 3968 |
|
|
|
| 3969 |
|
|
/* clear stack */
|
| 3970 |
|
|
BT_CLR(&btstack);
|
| 3971 |
|
|
|
| 3972 |
|
|
if (committed_size) {
|
| 3973 |
|
|
xoff = (committed_size >> JFS_SBI(ip->i_sb)->l2bsize) - 1;
|
| 3974 |
|
|
rc = xtSearch(ip, xoff, &cmp, &btstack, 0);
|
| 3975 |
|
|
if (rc)
|
| 3976 |
|
|
return rc;
|
| 3977 |
|
|
|
| 3978 |
|
|
XT_GETSEARCH(ip, btstack.top, bn, mp, p, index);
|
| 3979 |
|
|
|
| 3980 |
|
|
if (cmp != 0) {
|
| 3981 |
|
|
XT_PUTPAGE(mp);
|
| 3982 |
|
|
jfs_error(ip->i_sb,
|
| 3983 |
|
|
"xtTruncate_pmap: did not find extent");
|
| 3984 |
|
|
return -EIO;
|
| 3985 |
|
|
}
|
| 3986 |
|
|
} else {
|
| 3987 |
|
|
/*
|
| 3988 |
|
|
* start with root
|
| 3989 |
|
|
*
|
| 3990 |
|
|
* root resides in the inode
|
| 3991 |
|
|
*/
|
| 3992 |
|
|
bn = 0;
|
| 3993 |
|
|
|
| 3994 |
|
|
/*
|
| 3995 |
|
|
* first access of each page:
|
| 3996 |
|
|
*/
|
| 3997 |
|
|
getPage:
|
| 3998 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 3999 |
|
|
if (rc)
|
| 4000 |
|
|
return rc;
|
| 4001 |
|
|
|
| 4002 |
|
|
/* process entries backward from last index */
|
| 4003 |
|
|
index = le16_to_cpu(p->header.nextindex) - 1;
|
| 4004 |
|
|
|
| 4005 |
|
|
if (p->header.flag & BT_INTERNAL)
|
| 4006 |
|
|
goto getChild;
|
| 4007 |
|
|
}
|
| 4008 |
|
|
|
| 4009 |
|
|
/*
|
| 4010 |
|
|
* leaf page
|
| 4011 |
|
|
*/
|
| 4012 |
|
|
|
| 4013 |
|
|
if (++locked_leaves > MAX_TRUNCATE_LEAVES) {
|
| 4014 |
|
|
/*
|
| 4015 |
|
|
* We need to limit the size of the transaction
|
| 4016 |
|
|
* to avoid exhausting pagecache & tlocks
|
| 4017 |
|
|
*/
|
| 4018 |
|
|
xad = &p->xad[index];
|
| 4019 |
|
|
xoff = offsetXAD(xad);
|
| 4020 |
|
|
xlen = lengthXAD(xad);
|
| 4021 |
|
|
XT_PUTPAGE(mp);
|
| 4022 |
|
|
return (xoff + xlen) << JFS_SBI(ip->i_sb)->l2bsize;
|
| 4023 |
|
|
}
|
| 4024 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 4025 |
|
|
tlck->type = tlckXTREE | tlckFREE;
|
| 4026 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 4027 |
|
|
xtlck->hwm.offset = index;
|
| 4028 |
|
|
|
| 4029 |
|
|
|
| 4030 |
|
|
XT_PUTPAGE(mp);
|
| 4031 |
|
|
|
| 4032 |
|
|
/*
|
| 4033 |
|
|
* go back up to the parent page
|
| 4034 |
|
|
*/
|
| 4035 |
|
|
getParent:
|
| 4036 |
|
|
/* pop/restore parent entry for the current child page */
|
| 4037 |
|
|
if ((parent = BT_POP(&btstack)) == NULL)
|
| 4038 |
|
|
/* current page must have been root */
|
| 4039 |
|
|
goto out;
|
| 4040 |
|
|
|
| 4041 |
|
|
/* get back the parent page */
|
| 4042 |
|
|
bn = parent->bn;
|
| 4043 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4044 |
|
|
if (rc)
|
| 4045 |
|
|
return rc;
|
| 4046 |
|
|
|
| 4047 |
|
|
index = parent->index;
|
| 4048 |
|
|
|
| 4049 |
|
|
/*
|
| 4050 |
|
|
* parent page become empty: free the page
|
| 4051 |
|
|
*/
|
| 4052 |
|
|
if (index == XTENTRYSTART) {
|
| 4053 |
|
|
/* txCommit() with tlckFREE:
|
| 4054 |
|
|
* free child extents covered by parent;
|
| 4055 |
|
|
* invalidate parent if COMMIT_PWMAP;
|
| 4056 |
|
|
*/
|
| 4057 |
|
|
tlck = txLock(tid, ip, mp, tlckXTREE);
|
| 4058 |
|
|
xtlck = (struct xtlock *) & tlck->lock;
|
| 4059 |
|
|
xtlck->hwm.offset =
|
| 4060 |
|
|
le16_to_cpu(p->header.nextindex) - 1;
|
| 4061 |
|
|
tlck->type = tlckXTREE | tlckFREE;
|
| 4062 |
|
|
|
| 4063 |
|
|
XT_PUTPAGE(mp);
|
| 4064 |
|
|
|
| 4065 |
|
|
if (p->header.flag & BT_ROOT) {
|
| 4066 |
|
|
|
| 4067 |
|
|
goto out;
|
| 4068 |
|
|
} else {
|
| 4069 |
|
|
goto getParent;
|
| 4070 |
|
|
}
|
| 4071 |
|
|
}
|
| 4072 |
|
|
/*
|
| 4073 |
|
|
* parent page still has entries for front region;
|
| 4074 |
|
|
*/
|
| 4075 |
|
|
else
|
| 4076 |
|
|
index--;
|
| 4077 |
|
|
/*
|
| 4078 |
|
|
* internal page: go down to child page of current entry
|
| 4079 |
|
|
*/
|
| 4080 |
|
|
getChild:
|
| 4081 |
|
|
/* save current parent entry for the child page */
|
| 4082 |
|
|
BT_PUSH(&btstack, bn, index);
|
| 4083 |
|
|
|
| 4084 |
|
|
/* get child page */
|
| 4085 |
|
|
xad = &p->xad[index];
|
| 4086 |
|
|
bn = addressXAD(xad);
|
| 4087 |
|
|
|
| 4088 |
|
|
/*
|
| 4089 |
|
|
* first access of each internal entry:
|
| 4090 |
|
|
*/
|
| 4091 |
|
|
/* release parent page */
|
| 4092 |
|
|
XT_PUTPAGE(mp);
|
| 4093 |
|
|
|
| 4094 |
|
|
/* process the child page */
|
| 4095 |
|
|
goto getPage;
|
| 4096 |
|
|
|
| 4097 |
|
|
out:
|
| 4098 |
|
|
|
| 4099 |
|
|
return 0;
|
| 4100 |
|
|
}
|
| 4101 |
|
|
|
| 4102 |
|
|
|
| 4103 |
|
|
#ifdef _JFS_DEBUG_XTREE
|
| 4104 |
|
|
/*
|
| 4105 |
|
|
* xtDisplayTree()
|
| 4106 |
|
|
*
|
| 4107 |
|
|
* function: traverse forward
|
| 4108 |
|
|
*/
|
| 4109 |
|
|
int xtDisplayTree(struct inode *ip)
|
| 4110 |
|
|
{
|
| 4111 |
|
|
int rc = 0;
|
| 4112 |
|
|
struct metapage *mp;
|
| 4113 |
|
|
xtpage_t *p;
|
| 4114 |
|
|
s64 bn, pbn;
|
| 4115 |
|
|
int index, lastindex, v, h;
|
| 4116 |
|
|
xad_t *xad;
|
| 4117 |
|
|
struct btstack btstack;
|
| 4118 |
|
|
struct btframe *btsp;
|
| 4119 |
|
|
struct btframe *parent;
|
| 4120 |
|
|
|
| 4121 |
|
|
printk("display B+-tree.\n");
|
| 4122 |
|
|
|
| 4123 |
|
|
/* clear stack */
|
| 4124 |
|
|
btsp = btstack.stack;
|
| 4125 |
|
|
|
| 4126 |
|
|
/*
|
| 4127 |
|
|
* start with root
|
| 4128 |
|
|
*
|
| 4129 |
|
|
* root resides in the inode
|
| 4130 |
|
|
*/
|
| 4131 |
|
|
bn = 0;
|
| 4132 |
|
|
v = h = 0;
|
| 4133 |
|
|
|
| 4134 |
|
|
/*
|
| 4135 |
|
|
* first access of each page:
|
| 4136 |
|
|
*/
|
| 4137 |
|
|
getPage:
|
| 4138 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4139 |
|
|
if (rc)
|
| 4140 |
|
|
return rc;
|
| 4141 |
|
|
|
| 4142 |
|
|
/* process entries forward from first index */
|
| 4143 |
|
|
index = XTENTRYSTART;
|
| 4144 |
|
|
lastindex = le16_to_cpu(p->header.nextindex) - 1;
|
| 4145 |
|
|
|
| 4146 |
|
|
if (p->header.flag & BT_INTERNAL) {
|
| 4147 |
|
|
/*
|
| 4148 |
|
|
* first access of each internal page
|
| 4149 |
|
|
*/
|
| 4150 |
|
|
goto getChild;
|
| 4151 |
|
|
} else { /* (p->header.flag & BT_LEAF) */
|
| 4152 |
|
|
|
| 4153 |
|
|
/*
|
| 4154 |
|
|
* first access of each leaf page
|
| 4155 |
|
|
*/
|
| 4156 |
|
|
printf("leaf page ");
|
| 4157 |
|
|
xtDisplayPage(ip, bn, p);
|
| 4158 |
|
|
|
| 4159 |
|
|
/* unpin the leaf page */
|
| 4160 |
|
|
XT_PUTPAGE(mp);
|
| 4161 |
|
|
}
|
| 4162 |
|
|
|
| 4163 |
|
|
/*
|
| 4164 |
|
|
* go back up to the parent page
|
| 4165 |
|
|
*/
|
| 4166 |
|
|
getParent:
|
| 4167 |
|
|
/* pop/restore parent entry for the current child page */
|
| 4168 |
|
|
if ((parent = (btsp == btstack.stack ? NULL : --btsp)) == NULL)
|
| 4169 |
|
|
/* current page must have been root */
|
| 4170 |
|
|
return;
|
| 4171 |
|
|
|
| 4172 |
|
|
/*
|
| 4173 |
|
|
* parent page scan completed
|
| 4174 |
|
|
*/
|
| 4175 |
|
|
if ((index = parent->index) == (lastindex = parent->lastindex)) {
|
| 4176 |
|
|
/* go back up to the parent page */
|
| 4177 |
|
|
goto getParent;
|
| 4178 |
|
|
}
|
| 4179 |
|
|
|
| 4180 |
|
|
/*
|
| 4181 |
|
|
* parent page has entries remaining
|
| 4182 |
|
|
*/
|
| 4183 |
|
|
/* get back the parent page */
|
| 4184 |
|
|
bn = parent->bn;
|
| 4185 |
|
|
/* v = parent->level; */
|
| 4186 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4187 |
|
|
if (rc)
|
| 4188 |
|
|
return rc;
|
| 4189 |
|
|
|
| 4190 |
|
|
/* get next parent entry */
|
| 4191 |
|
|
index++;
|
| 4192 |
|
|
|
| 4193 |
|
|
/*
|
| 4194 |
|
|
* internal page: go down to child page of current entry
|
| 4195 |
|
|
*/
|
| 4196 |
|
|
getChild:
|
| 4197 |
|
|
/* push/save current parent entry for the child page */
|
| 4198 |
|
|
btsp->bn = pbn = bn;
|
| 4199 |
|
|
btsp->index = index;
|
| 4200 |
|
|
btsp->lastindex = lastindex;
|
| 4201 |
|
|
/* btsp->level = v; */
|
| 4202 |
|
|
/* btsp->node = h; */
|
| 4203 |
|
|
++btsp;
|
| 4204 |
|
|
|
| 4205 |
|
|
/* get child page */
|
| 4206 |
|
|
xad = &p->xad[index];
|
| 4207 |
|
|
bn = addressXAD(xad);
|
| 4208 |
|
|
|
| 4209 |
|
|
/*
|
| 4210 |
|
|
* first access of each internal entry:
|
| 4211 |
|
|
*/
|
| 4212 |
|
|
/* release parent page */
|
| 4213 |
|
|
XT_PUTPAGE(mp);
|
| 4214 |
|
|
|
| 4215 |
|
|
printk("traverse down 0x%lx[%d]->0x%lx\n", (ulong) pbn, index,
|
| 4216 |
|
|
(ulong) bn);
|
| 4217 |
|
|
v++;
|
| 4218 |
|
|
h = index;
|
| 4219 |
|
|
|
| 4220 |
|
|
/* process the child page */
|
| 4221 |
|
|
goto getPage;
|
| 4222 |
|
|
}
|
| 4223 |
|
|
|
| 4224 |
|
|
|
| 4225 |
|
|
/*
|
| 4226 |
|
|
* xtDisplayPage()
|
| 4227 |
|
|
*
|
| 4228 |
|
|
* function: display page
|
| 4229 |
|
|
*/
|
| 4230 |
|
|
int xtDisplayPage(struct inode *ip, s64 bn, xtpage_t * p)
|
| 4231 |
|
|
{
|
| 4232 |
|
|
int rc = 0;
|
| 4233 |
|
|
xad_t *xad;
|
| 4234 |
|
|
s64 xaddr, xoff;
|
| 4235 |
|
|
int xlen, i, j;
|
| 4236 |
|
|
|
| 4237 |
|
|
/* display page control */
|
| 4238 |
|
|
printf("bn:0x%lx flag:0x%x nextindex:%d\n",
|
| 4239 |
|
|
(ulong) bn, p->header.flag,
|
| 4240 |
|
|
le16_to_cpu(p->header.nextindex));
|
| 4241 |
|
|
|
| 4242 |
|
|
/* display entries */
|
| 4243 |
|
|
xad = &p->xad[XTENTRYSTART];
|
| 4244 |
|
|
for (i = XTENTRYSTART, j = 1; i < le16_to_cpu(p->header.nextindex);
|
| 4245 |
|
|
i++, xad++, j++) {
|
| 4246 |
|
|
xoff = offsetXAD(xad);
|
| 4247 |
|
|
xaddr = addressXAD(xad);
|
| 4248 |
|
|
xlen = lengthXAD(xad);
|
| 4249 |
|
|
printf("\t[%d] 0x%lx:0x%lx(0x%x)", i, (ulong) xoff,
|
| 4250 |
|
|
(ulong) xaddr, xlen);
|
| 4251 |
|
|
|
| 4252 |
|
|
if (j == 4) {
|
| 4253 |
|
|
printf("\n");
|
| 4254 |
|
|
j = 0;
|
| 4255 |
|
|
}
|
| 4256 |
|
|
}
|
| 4257 |
|
|
|
| 4258 |
|
|
printf("\n");
|
| 4259 |
|
|
}
|
| 4260 |
|
|
#endif /* _JFS_DEBUG_XTREE */
|
| 4261 |
|
|
|
| 4262 |
|
|
|
| 4263 |
|
|
#ifdef _JFS_WIP
|
| 4264 |
|
|
/*
|
| 4265 |
|
|
* xtGather()
|
| 4266 |
|
|
*
|
| 4267 |
|
|
* function:
|
| 4268 |
|
|
* traverse for allocation acquiring tlock at commit time
|
| 4269 |
|
|
* (vs at the time of update) logging backward top down
|
| 4270 |
|
|
*
|
| 4271 |
|
|
* note:
|
| 4272 |
|
|
* problem - establishing that all new allocation have been
|
| 4273 |
|
|
* processed both for append and random write in sparse file
|
| 4274 |
|
|
* at the current entry at the current subtree root page
|
| 4275 |
|
|
*
|
| 4276 |
|
|
*/
|
| 4277 |
|
|
int xtGather(btree_t *t)
|
| 4278 |
|
|
{
|
| 4279 |
|
|
int rc = 0;
|
| 4280 |
|
|
xtpage_t *p;
|
| 4281 |
|
|
u64 bn;
|
| 4282 |
|
|
int index;
|
| 4283 |
|
|
btentry_t *e;
|
| 4284 |
|
|
struct btstack btstack;
|
| 4285 |
|
|
struct btsf *parent;
|
| 4286 |
|
|
|
| 4287 |
|
|
/* clear stack */
|
| 4288 |
|
|
BT_CLR(&btstack);
|
| 4289 |
|
|
|
| 4290 |
|
|
/*
|
| 4291 |
|
|
* start with root
|
| 4292 |
|
|
*
|
| 4293 |
|
|
* root resides in the inode
|
| 4294 |
|
|
*/
|
| 4295 |
|
|
bn = 0;
|
| 4296 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4297 |
|
|
if (rc)
|
| 4298 |
|
|
return rc;
|
| 4299 |
|
|
|
| 4300 |
|
|
/* new root is NOT pointed by a new entry
|
| 4301 |
|
|
if (p->header.flag & NEW)
|
| 4302 |
|
|
allocate new page lock;
|
| 4303 |
|
|
write a NEWPAGE log;
|
| 4304 |
|
|
*/
|
| 4305 |
|
|
|
| 4306 |
|
|
dopage:
|
| 4307 |
|
|
/*
|
| 4308 |
|
|
* first access of each page:
|
| 4309 |
|
|
*/
|
| 4310 |
|
|
/* process entries backward from last index */
|
| 4311 |
|
|
index = le16_to_cpu(p->header.nextindex) - 1;
|
| 4312 |
|
|
|
| 4313 |
|
|
if (p->header.flag & BT_LEAF) {
|
| 4314 |
|
|
/*
|
| 4315 |
|
|
* first access of each leaf page
|
| 4316 |
|
|
*/
|
| 4317 |
|
|
/* process leaf page entries backward */
|
| 4318 |
|
|
for (; index >= XTENTRYSTART; index--) {
|
| 4319 |
|
|
e = &p->xad[index];
|
| 4320 |
|
|
/*
|
| 4321 |
|
|
* if newpage, log NEWPAGE.
|
| 4322 |
|
|
*
|
| 4323 |
|
|
if (e->flag & XAD_NEW) {
|
| 4324 |
|
|
nfound =+ entry->length;
|
| 4325 |
|
|
update current page lock for the entry;
|
| 4326 |
|
|
newpage(entry);
|
| 4327 |
|
|
*
|
| 4328 |
|
|
* if moved, log move.
|
| 4329 |
|
|
*
|
| 4330 |
|
|
} else if (e->flag & XAD_MOVED) {
|
| 4331 |
|
|
reset flag;
|
| 4332 |
|
|
update current page lock for the entry;
|
| 4333 |
|
|
}
|
| 4334 |
|
|
*/
|
| 4335 |
|
|
}
|
| 4336 |
|
|
|
| 4337 |
|
|
/* unpin the leaf page */
|
| 4338 |
|
|
XT_PUTPAGE(mp);
|
| 4339 |
|
|
|
| 4340 |
|
|
/*
|
| 4341 |
|
|
* go back up to the parent page
|
| 4342 |
|
|
*/
|
| 4343 |
|
|
getParent:
|
| 4344 |
|
|
/* restore parent entry for the current child page */
|
| 4345 |
|
|
if ((parent = BT_POP(&btstack)) == NULL)
|
| 4346 |
|
|
/* current page must have been root */
|
| 4347 |
|
|
return 0;
|
| 4348 |
|
|
|
| 4349 |
|
|
if ((index = parent->index) == XTENTRYSTART) {
|
| 4350 |
|
|
/*
|
| 4351 |
|
|
* parent page scan completed
|
| 4352 |
|
|
*/
|
| 4353 |
|
|
/* go back up to the parent page */
|
| 4354 |
|
|
goto getParent;
|
| 4355 |
|
|
} else {
|
| 4356 |
|
|
/*
|
| 4357 |
|
|
* parent page has entries remaining
|
| 4358 |
|
|
*/
|
| 4359 |
|
|
/* get back the parent page */
|
| 4360 |
|
|
bn = parent->bn;
|
| 4361 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4362 |
|
|
if (rc)
|
| 4363 |
|
|
return -EIO;
|
| 4364 |
|
|
|
| 4365 |
|
|
/* first subroot page which
|
| 4366 |
|
|
* covers all new allocated blocks
|
| 4367 |
|
|
* itself not new/modified.
|
| 4368 |
|
|
* (if modified from split of descendent,
|
| 4369 |
|
|
* go down path of split page)
|
| 4370 |
|
|
|
| 4371 |
|
|
if (nfound == nnew &&
|
| 4372 |
|
|
!(p->header.flag & (NEW | MOD)))
|
| 4373 |
|
|
exit scan;
|
| 4374 |
|
|
*/
|
| 4375 |
|
|
|
| 4376 |
|
|
/* process parent page entries backward */
|
| 4377 |
|
|
index--;
|
| 4378 |
|
|
}
|
| 4379 |
|
|
} else {
|
| 4380 |
|
|
/*
|
| 4381 |
|
|
* first access of each internal page
|
| 4382 |
|
|
*/
|
| 4383 |
|
|
}
|
| 4384 |
|
|
|
| 4385 |
|
|
/*
|
| 4386 |
|
|
* internal page: go down to child page of current entry
|
| 4387 |
|
|
*/
|
| 4388 |
|
|
|
| 4389 |
|
|
/* save current parent entry for the child page */
|
| 4390 |
|
|
BT_PUSH(&btstack, bn, index);
|
| 4391 |
|
|
|
| 4392 |
|
|
/* get current entry for the child page */
|
| 4393 |
|
|
e = &p->xad[index];
|
| 4394 |
|
|
|
| 4395 |
|
|
/*
|
| 4396 |
|
|
* first access of each internal entry:
|
| 4397 |
|
|
*/
|
| 4398 |
|
|
/*
|
| 4399 |
|
|
* if new entry, log btree_tnewentry.
|
| 4400 |
|
|
*
|
| 4401 |
|
|
if (e->flag & XAD_NEW)
|
| 4402 |
|
|
update parent page lock for the entry;
|
| 4403 |
|
|
*/
|
| 4404 |
|
|
|
| 4405 |
|
|
/* release parent page */
|
| 4406 |
|
|
XT_PUTPAGE(mp);
|
| 4407 |
|
|
|
| 4408 |
|
|
/* get child page */
|
| 4409 |
|
|
bn = e->bn;
|
| 4410 |
|
|
XT_GETPAGE(ip, bn, mp, PSIZE, p, rc);
|
| 4411 |
|
|
if (rc)
|
| 4412 |
|
|
return rc;
|
| 4413 |
|
|
|
| 4414 |
|
|
/*
|
| 4415 |
|
|
* first access of each non-root page:
|
| 4416 |
|
|
*/
|
| 4417 |
|
|
/*
|
| 4418 |
|
|
* if new, log btree_newpage.
|
| 4419 |
|
|
*
|
| 4420 |
|
|
if (p->header.flag & NEW)
|
| 4421 |
|
|
allocate new page lock;
|
| 4422 |
|
|
write a NEWPAGE log (next, prev);
|
| 4423 |
|
|
*/
|
| 4424 |
|
|
|
| 4425 |
|
|
/* process the child page */
|
| 4426 |
|
|
goto dopage;
|
| 4427 |
|
|
|
| 4428 |
|
|
out:
|
| 4429 |
|
|
return 0;
|
| 4430 |
|
|
}
|
| 4431 |
|
|
#endif /* _JFS_WIP */
|
| 4432 |
|
|
|
| 4433 |
|
|
|
| 4434 |
|
|
#ifdef CONFIG_JFS_STATISTICS
|
| 4435 |
|
|
int jfs_xtstat_read(char *buffer, char **start, off_t offset, int length,
|
| 4436 |
|
|
int *eof, void *data)
|
| 4437 |
|
|
{
|
| 4438 |
|
|
int len = 0;
|
| 4439 |
|
|
off_t begin;
|
| 4440 |
|
|
|
| 4441 |
|
|
len += sprintf(buffer,
|
| 4442 |
|
|
"JFS Xtree statistics\n"
|
| 4443 |
|
|
"====================\n"
|
| 4444 |
|
|
"searches = %d\n"
|
| 4445 |
|
|
"fast searches = %d\n"
|
| 4446 |
|
|
"splits = %d\n",
|
| 4447 |
|
|
xtStat.search,
|
| 4448 |
|
|
xtStat.fastSearch,
|
| 4449 |
|
|
xtStat.split);
|
| 4450 |
|
|
|
| 4451 |
|
|
begin = offset;
|
| 4452 |
|
|
*start = buffer + begin;
|
| 4453 |
|
|
len -= begin;
|
| 4454 |
|
|
|
| 4455 |
|
|
if (len > length)
|
| 4456 |
|
|
len = length;
|
| 4457 |
|
|
else
|
| 4458 |
|
|
*eof = 1;
|
| 4459 |
|
|
|
| 4460 |
|
|
if (len < 0)
|
| 4461 |
|
|
len = 0;
|
| 4462 |
|
|
|
| 4463 |
|
|
return len;
|
| 4464 |
|
|
}
|
| 4465 |
|
|
#endif
|
