/*
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/*
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* linux/fs/sysv/fsync.c
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* linux/fs/sysv/fsync.c
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*
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*
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* minix/fsync.c
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* minix/fsync.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
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* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
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*
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*
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* coh/fsync.c
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* coh/fsync.c
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* Copyright (C) 1993 Pascal Haible, Bruno Haible
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* Copyright (C) 1993 Pascal Haible, Bruno Haible
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*
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*
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* sysv/fsync.c
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* sysv/fsync.c
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* Copyright (C) 1993 Bruno Haible
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* Copyright (C) 1993 Bruno Haible
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*
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*
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* SystemV/Coherent fsync primitive
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* SystemV/Coherent fsync primitive
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*/
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*/
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/sysv_fs.h>
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#include <linux/sysv_fs.h>
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/* return values: 0 means OK/done, 1 means redo, -1 means I/O error. */
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/* return values: 0 means OK/done, 1 means redo, -1 means I/O error. */
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/* Sync one block. The block number is
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/* Sync one block. The block number is
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* from_coh_ulong(*blockp) if convert=1, *blockp if convert=0.
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* from_coh_ulong(*blockp) if convert=1, *blockp if convert=0.
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*/
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*/
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static int sync_block (struct inode * inode, unsigned long * blockp, int convert, int wait)
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static int sync_block (struct inode * inode, unsigned long * blockp, int convert, int wait)
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{
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{
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struct buffer_head * bh;
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struct buffer_head * bh;
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unsigned long tmp, block;
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unsigned long tmp, block;
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struct super_block * sb;
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struct super_block * sb;
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block = tmp = *blockp;
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block = tmp = *blockp;
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if (convert)
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if (convert)
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block = from_coh_ulong(block);
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block = from_coh_ulong(block);
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if (!block)
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if (!block)
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return 0;
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return 0;
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sb = inode->i_sb;
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sb = inode->i_sb;
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bh = sv_get_hash_table(sb, inode->i_dev, block);
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bh = sv_get_hash_table(sb, inode->i_dev, block);
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if (!bh)
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if (!bh)
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return 0;
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return 0;
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if (*blockp != tmp) {
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if (*blockp != tmp) {
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brelse (bh);
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brelse (bh);
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return 1;
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return 1;
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}
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}
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if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
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if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
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brelse(bh);
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brelse(bh);
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return -1;
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return -1;
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}
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}
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if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
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if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
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brelse(bh);
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brelse(bh);
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return 0;
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return 0;
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}
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}
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ll_rw_block(WRITE, 1, &bh);
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ll_rw_block(WRITE, 1, &bh);
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bh->b_count--;
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bh->b_count--;
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return 0;
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return 0;
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}
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}
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/* Sync one block full of indirect pointers and read it because we'll need it. */
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/* Sync one block full of indirect pointers and read it because we'll need it. */
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static int sync_iblock (struct inode * inode, unsigned long * iblockp, int convert,
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static int sync_iblock (struct inode * inode, unsigned long * iblockp, int convert,
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struct buffer_head * *bh, int wait)
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struct buffer_head * *bh, int wait)
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{
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{
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int rc;
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int rc;
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unsigned long tmp, block;
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unsigned long tmp, block;
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*bh = NULL;
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*bh = NULL;
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block = tmp = *iblockp;
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block = tmp = *iblockp;
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if (convert)
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if (convert)
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block = from_coh_ulong(block);
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block = from_coh_ulong(block);
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if (!block)
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if (!block)
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return 0;
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return 0;
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rc = sync_block (inode, iblockp, convert, wait);
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rc = sync_block (inode, iblockp, convert, wait);
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if (rc)
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if (rc)
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return rc;
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return rc;
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*bh = sv_bread(inode->i_sb, inode->i_dev, block);
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*bh = sv_bread(inode->i_sb, inode->i_dev, block);
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if (tmp != *iblockp) {
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if (tmp != *iblockp) {
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brelse(*bh);
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brelse(*bh);
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*bh = NULL;
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*bh = NULL;
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return 1;
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return 1;
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}
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}
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if (!*bh)
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if (!*bh)
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return -1;
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return -1;
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return 0;
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return 0;
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}
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}
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static int sync_direct(struct inode *inode, int wait)
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static int sync_direct(struct inode *inode, int wait)
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{
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{
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int i;
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int i;
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int rc, err = 0;
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int rc, err = 0;
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for (i = 0; i < 10; i++) {
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for (i = 0; i < 10; i++) {
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rc = sync_block (inode, inode->u.sysv_i.i_data + i, 0, wait);
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rc = sync_block (inode, inode->u.sysv_i.i_data + i, 0, wait);
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if (rc > 0)
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if (rc > 0)
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break;
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break;
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if (rc)
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if (rc)
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err = rc;
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err = rc;
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}
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}
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return err;
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return err;
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}
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}
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static int sync_indirect(struct inode *inode, unsigned long *iblockp, int convert, int wait)
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static int sync_indirect(struct inode *inode, unsigned long *iblockp, int convert, int wait)
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{
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{
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int i;
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int i;
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struct buffer_head * ind_bh;
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struct buffer_head * ind_bh;
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int rc, err = 0;
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int rc, err = 0;
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struct super_block * sb;
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struct super_block * sb;
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rc = sync_iblock (inode, iblockp, convert, &ind_bh, wait);
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rc = sync_iblock (inode, iblockp, convert, &ind_bh, wait);
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if (rc || !ind_bh)
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if (rc || !ind_bh)
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return rc;
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return rc;
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sb = inode->i_sb;
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sb = inode->i_sb;
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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rc = sync_block (inode,
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rc = sync_block (inode,
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((unsigned long *) ind_bh->b_data) + i, sb->sv_convert,
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((unsigned long *) ind_bh->b_data) + i, sb->sv_convert,
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wait);
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wait);
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if (rc > 0)
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if (rc > 0)
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break;
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break;
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if (rc)
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if (rc)
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err = rc;
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err = rc;
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}
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}
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brelse(ind_bh);
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brelse(ind_bh);
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return err;
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return err;
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}
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}
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static int sync_dindirect(struct inode *inode, unsigned long *diblockp, int convert,
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static int sync_dindirect(struct inode *inode, unsigned long *diblockp, int convert,
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int wait)
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int wait)
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{
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{
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int i;
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int i;
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struct buffer_head * dind_bh;
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struct buffer_head * dind_bh;
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int rc, err = 0;
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int rc, err = 0;
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struct super_block * sb;
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struct super_block * sb;
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rc = sync_iblock (inode, diblockp, convert, &dind_bh, wait);
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rc = sync_iblock (inode, diblockp, convert, &dind_bh, wait);
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if (rc || !dind_bh)
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if (rc || !dind_bh)
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return rc;
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return rc;
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sb = inode->i_sb;
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sb = inode->i_sb;
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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rc = sync_indirect (inode,
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rc = sync_indirect (inode,
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((unsigned long *) dind_bh->b_data) + i, sb->sv_convert,
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((unsigned long *) dind_bh->b_data) + i, sb->sv_convert,
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wait);
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wait);
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if (rc > 0)
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if (rc > 0)
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break;
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break;
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if (rc)
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if (rc)
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err = rc;
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err = rc;
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}
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}
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brelse(dind_bh);
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brelse(dind_bh);
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return err;
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return err;
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}
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}
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static int sync_tindirect(struct inode *inode, unsigned long *tiblockp, int convert,
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static int sync_tindirect(struct inode *inode, unsigned long *tiblockp, int convert,
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int wait)
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int wait)
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{
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{
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int i;
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int i;
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struct buffer_head * tind_bh;
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struct buffer_head * tind_bh;
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int rc, err = 0;
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int rc, err = 0;
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struct super_block * sb;
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struct super_block * sb;
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rc = sync_iblock (inode, tiblockp, convert, &tind_bh, wait);
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rc = sync_iblock (inode, tiblockp, convert, &tind_bh, wait);
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if (rc || !tind_bh)
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if (rc || !tind_bh)
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return rc;
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return rc;
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sb = inode->i_sb;
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sb = inode->i_sb;
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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for (i = 0; i < sb->sv_ind_per_block; i++) {
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rc = sync_dindirect (inode,
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rc = sync_dindirect (inode,
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((unsigned long *) tind_bh->b_data) + i, sb->sv_convert,
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((unsigned long *) tind_bh->b_data) + i, sb->sv_convert,
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wait);
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wait);
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if (rc > 0)
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if (rc > 0)
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break;
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break;
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if (rc)
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if (rc)
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err = rc;
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err = rc;
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}
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}
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brelse(tind_bh);
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brelse(tind_bh);
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return err;
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return err;
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}
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}
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int sysv_sync_file(struct inode * inode, struct file * file)
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int sysv_sync_file(struct inode * inode, struct file * file)
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{
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{
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int wait, err = 0;
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int wait, err = 0;
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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S_ISLNK(inode->i_mode)))
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return -EINVAL;
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return -EINVAL;
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for (wait=0; wait<=1; wait++) {
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for (wait=0; wait<=1; wait++) {
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err |= sync_direct(inode, wait);
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err |= sync_direct(inode, wait);
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err |= sync_indirect(inode, inode->u.sysv_i.i_data+10, 0, wait);
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err |= sync_indirect(inode, inode->u.sysv_i.i_data+10, 0, wait);
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err |= sync_dindirect(inode, inode->u.sysv_i.i_data+11, 0, wait);
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err |= sync_dindirect(inode, inode->u.sysv_i.i_data+11, 0, wait);
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err |= sync_tindirect(inode, inode->u.sysv_i.i_data+12, 0, wait);
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err |= sync_tindirect(inode, inode->u.sysv_i.i_data+12, 0, wait);
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}
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}
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err |= sysv_sync_inode (inode);
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err |= sysv_sync_inode (inode);
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return (err < 0) ? -EIO : 0;
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return (err < 0) ? -EIO : 0;
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}
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}
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