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/*
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/*
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* linux/fs/ext/fsync.c
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* linux/fs/ext/fsync.c
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*
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*
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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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* from
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* from
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* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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* from
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* from
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* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
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* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
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*
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*
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* extfs fsync primitive
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* extfs fsync primitive
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*/
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*/
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <linux/locks.h>
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#include <linux/locks.h>
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/ext_fs.h>
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#include <linux/ext_fs.h>
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#define blocksize BLOCK_SIZE
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#define blocksize BLOCK_SIZE
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#define addr_per_block 256
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#define addr_per_block 256
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static int sync_block (struct inode * inode, unsigned long * block, int wait)
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static int sync_block (struct inode * inode, unsigned long * block, 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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int tmp;
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int tmp;
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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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tmp = *block;
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tmp = *block;
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bh = get_hash_table(inode->i_dev, *block, blocksize);
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bh = get_hash_table(inode->i_dev, *block, blocksize);
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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 (*block != tmp) {
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if (*block != 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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{
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{
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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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static int sync_iblock (struct inode * inode, unsigned long * iblock,
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static int sync_iblock (struct inode * inode, unsigned long * iblock,
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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, tmp;
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int rc, tmp;
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*bh = NULL;
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*bh = NULL;
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tmp = *iblock;
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tmp = *iblock;
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if (!tmp)
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if (!tmp)
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return 0;
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return 0;
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rc = sync_block (inode, iblock, wait);
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rc = sync_block (inode, iblock, 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 = bread(inode->i_dev, tmp, blocksize);
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*bh = bread(inode->i_dev, tmp, blocksize);
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if (tmp != *iblock) {
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if (tmp != *iblock) {
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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 < 9; i++) {
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for (i = 0; i < 9; i++) {
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rc = sync_block (inode, inode->u.ext_i.i_data + i, wait);
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rc = sync_block (inode, inode->u.ext_i.i_data + i, 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 *iblock, int wait)
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static int sync_indirect(struct inode *inode, unsigned long *iblock, 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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rc = sync_iblock (inode, iblock, &ind_bh, wait);
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rc = sync_iblock (inode, iblock, &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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for (i = 0; i < addr_per_block; i++) {
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for (i = 0; i < addr_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,
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((unsigned long *) ind_bh->b_data) + i,
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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 *diblock,
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static int sync_dindirect(struct inode *inode, unsigned long *diblock,
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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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rc = sync_iblock (inode, diblock, &dind_bh, wait);
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rc = sync_iblock (inode, diblock, &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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for (i = 0; i < addr_per_block; i++) {
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for (i = 0; i < addr_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,
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((unsigned long *) dind_bh->b_data) + i,
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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 *tiblock,
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static int sync_tindirect(struct inode *inode, unsigned long *tiblock,
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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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rc = sync_iblock (inode, tiblock, &tind_bh, wait);
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rc = sync_iblock (inode, tiblock, &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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for (i = 0; i < addr_per_block; i++) {
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for (i = 0; i < addr_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,
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((unsigned long *) tind_bh->b_data) + i,
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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 ext_sync_file(struct inode * inode, struct file *file)
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int ext_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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{
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{
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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.ext_i.i_data+9, wait);
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err |= sync_indirect(inode, inode->u.ext_i.i_data+9, wait);
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err |= sync_dindirect(inode, inode->u.ext_i.i_data+10, wait);
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err |= sync_dindirect(inode, inode->u.ext_i.i_data+10, wait);
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err |= sync_tindirect(inode, inode->u.ext_i.i_data+11, wait);
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err |= sync_tindirect(inode, inode->u.ext_i.i_data+11, wait);
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}
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}
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err |= ext_sync_inode (inode);
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err |= ext_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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