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/*
* linux/fs/ext2/fsync.c
*
* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
* from
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
* from
* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
*
* ext2fs fsync primitive
*
* Big-endian to little-endian byte-swapping/bitmaps by
* David S. Miller (davem@caip.rutgers.edu), 1995
*
* Removed unnecessary code duplication for little endian machines
* and excessive __inline__s.
* Andi Kleen, 1997
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/fcntl.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/locks.h>
#define blocksize (EXT2_BLOCK_SIZE(inode->i_sb))
#define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb))
static int sync_block (struct inode * inode, u32 * block, int wait)
{
struct buffer_head * bh;
if (!*block)
return 0;
bh = get_hash_table (inode->i_dev, *block, blocksize);
if (!bh)
return 0;
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse (bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
brelse (bh);
return 0;
}
ll_rw_block (WRITE, 1, &bh);
bh->b_count--;
return 0;
}
#ifndef __LITTLE_ENDIAN
static int sync_block_swab32 (struct inode * inode, u32 * block, int wait)
{
struct buffer_head * bh;
if (!le32_to_cpu(*block))
return 0;
bh = get_hash_table (inode->i_dev, le32_to_cpu(*block), blocksize);
if (!bh)
return 0;
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse (bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
brelse (bh);
return 0;
}
ll_rw_block (WRITE, 1, &bh);
bh->b_count--;
return 0;
}
#else
#define sync_block_swab32 sync_block
#endif
static int sync_iblock (struct inode * inode, u32 * iblock,
struct buffer_head ** bh, int wait)
{
int rc, tmp;
*bh = NULL;
tmp = *iblock;
if (!tmp)
return 0;
rc = sync_block (inode, iblock, wait);
if (rc)
return rc;
*bh = bread (inode->i_dev, tmp, blocksize);
if (!*bh)
return -1;
return 0;
}
#ifndef __LITTLE_ENDIAN
static int sync_iblock_swab32 (struct inode * inode, u32 * iblock,
struct buffer_head ** bh, int wait)
{
int rc, tmp;
*bh = NULL;
tmp = le32_to_cpu(*iblock);
if (!tmp)
return 0;
rc = sync_block_swab32 (inode, iblock, wait);
if (rc)
return rc;
*bh = bread (inode->i_dev, tmp, blocksize);
if (!*bh)
return -1;
return 0;
}
#else
#define sync_iblock_swab32 sync_iblock
#endif
static int sync_direct (struct inode * inode, int wait)
{
int i;
int rc, err = 0;
for (i = 0; i < EXT2_NDIR_BLOCKS; i++) {
rc = sync_block (inode, inode->u.ext2_i.i_data + i, wait);
if (rc)
err = rc;
}
return err;
}
static int sync_indirect (struct inode * inode, u32 * iblock, int wait)
{
int i;
struct buffer_head * ind_bh;
int rc, err = 0;
rc = sync_iblock (inode, iblock, &ind_bh, wait);
if (rc || !ind_bh)
return rc;
for (i = 0; i < addr_per_block; i++) {
rc = sync_block_swab32 (inode,
((u32 *) ind_bh->b_data) + i,
wait);
if (rc)
err = rc;
}
brelse (ind_bh);
return err;
}
#ifndef __LITTLE_ENDIAN
static __inline__ int sync_indirect_swab32 (struct inode * inode, u32 * iblock, int wait)
{
int i;
struct buffer_head * ind_bh;
int rc, err = 0;
rc = sync_iblock_swab32 (inode, iblock, &ind_bh, wait);
if (rc || !ind_bh)
return rc;
for (i = 0; i < addr_per_block; i++) {
rc = sync_block_swab32 (inode,
((u32 *) ind_bh->b_data) + i,
wait);
if (rc)
err = rc;
}
brelse (ind_bh);
return err;
}
#else
#define sync_indirect_swab32 sync_indirect
#endif
static int sync_dindirect (struct inode * inode, u32 * diblock, int wait)
{
int i;
struct buffer_head * dind_bh;
int rc, err = 0;
rc = sync_iblock (inode, diblock, &dind_bh, wait);
if (rc || !dind_bh)
return rc;
for (i = 0; i < addr_per_block; i++) {
rc = sync_indirect_swab32 (inode,
((u32 *) dind_bh->b_data) + i,
wait);
if (rc)
err = rc;
}
brelse (dind_bh);
return err;
}
#ifndef __LITTLE_ENDIAN
static __inline__ int sync_dindirect_swab32 (struct inode * inode, u32 * diblock, int wait)
{
int i;
struct buffer_head * dind_bh;
int rc, err = 0;
rc = sync_iblock_swab32 (inode, diblock, &dind_bh, wait);
if (rc || !dind_bh)
return rc;
for (i = 0; i < addr_per_block; i++) {
rc = sync_indirect_swab32 (inode,
((u32 *) dind_bh->b_data) + i,
wait);
if (rc)
err = rc;
}
brelse (dind_bh);
return err;
}
#else
#define sync_dindirect_swab32 sync_dindirect
#endif
static int sync_tindirect (struct inode * inode, u32 * tiblock, int wait)
{
int i;
struct buffer_head * tind_bh;
int rc, err = 0;
rc = sync_iblock (inode, tiblock, &tind_bh, wait);
if (rc || !tind_bh)
return rc;
for (i = 0; i < addr_per_block; i++) {
rc = sync_dindirect_swab32 (inode,
((u32 *) tind_bh->b_data) + i,
wait);
if (rc)
err = rc;
}
brelse (tind_bh);
return err;
}
/*
* File may be NULL when we are called. Perhaps we shouldn't
* even pass file to fsync ?
*/
int ext2_sync_file(struct file * file, struct dentry *dentry)
{
int wait, err = 0;
struct inode *inode = dentry->d_inode;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return -EINVAL;
if (S_ISLNK(inode->i_mode) && !(inode->i_blocks))
/*
* Don't sync fast links!
*/
goto skip;
for (wait=0; wait<=1; wait++)
{
err |= sync_direct (inode, wait);
err |= sync_indirect (inode,
inode->u.ext2_i.i_data+EXT2_IND_BLOCK,
wait);
err |= sync_dindirect (inode,
inode->u.ext2_i.i_data+EXT2_DIND_BLOCK,
wait);
err |= sync_tindirect (inode,
inode->u.ext2_i.i_data+EXT2_TIND_BLOCK,
wait);
}
skip:
err |= ext2_sync_inode (inode);
return err ? -EIO : 0;
}
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