/*
|
/*
|
* linux/fs/ext2/fsync.c
|
* linux/fs/ext2/fsync.c
|
*
|
*
|
* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
|
* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
|
* from
|
* from
|
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
|
* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
|
* Laboratoire MASI - Institut Blaise Pascal
|
* Laboratoire MASI - Institut Blaise Pascal
|
* Universite Pierre et Marie Curie (Paris VI)
|
* Universite Pierre et Marie Curie (Paris VI)
|
* from
|
* from
|
* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
|
* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
|
*
|
*
|
* ext2fs fsync primitive
|
* ext2fs fsync primitive
|
*
|
*
|
* Big-endian to little-endian byte-swapping/bitmaps by
|
* Big-endian to little-endian byte-swapping/bitmaps by
|
* David S. Miller (davem@caip.rutgers.edu), 1995
|
* David S. Miller (davem@caip.rutgers.edu), 1995
|
*
|
*
|
* Fast 'fsync' on large files (Scott Laird <laird@pacificrim.net>)
|
* Fast 'fsync' on large files (Scott Laird <laird@pacificrim.net>)
|
*/
|
*/
|
|
|
#include <asm/segment.h>
|
#include <asm/segment.h>
|
#include <asm/system.h>
|
#include <asm/system.h>
|
|
|
#include <linux/errno.h>
|
#include <linux/errno.h>
|
#include <linux/fs.h>
|
#include <linux/fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/ext2_fs.h>
|
#include <linux/fcntl.h>
|
#include <linux/fcntl.h>
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/stat.h>
|
#include <linux/stat.h>
|
#include <linux/locks.h>
|
#include <linux/locks.h>
|
|
|
|
|
#define blocksize (EXT2_BLOCK_SIZE(inode->i_sb))
|
#define blocksize (EXT2_BLOCK_SIZE(inode->i_sb))
|
#define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb))
|
#define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb))
|
|
|
static __inline__ int sync_block (struct inode * inode, u32 * block, int wait)
|
static __inline__ int sync_block (struct inode * inode, u32 * block, int wait)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
int tmp;
|
int tmp;
|
|
|
if (!*block)
|
if (!*block)
|
return 0;
|
return 0;
|
tmp = *block;
|
tmp = *block;
|
bh = get_hash_table (inode->i_dev, *block, blocksize);
|
bh = get_hash_table (inode->i_dev, *block, blocksize);
|
if (!bh)
|
if (!bh)
|
return 0;
|
return 0;
|
if (*block != tmp) {
|
if (*block != tmp) {
|
brelse (bh);
|
brelse (bh);
|
return 1;
|
return 1;
|
}
|
}
|
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
|
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
|
brelse (bh);
|
brelse (bh);
|
return -1;
|
return -1;
|
}
|
}
|
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
|
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
|
brelse (bh);
|
brelse (bh);
|
return 0;
|
return 0;
|
}
|
}
|
ll_rw_block (WRITE, 1, &bh);
|
ll_rw_block (WRITE, 1, &bh);
|
bh->b_count--;
|
bh->b_count--;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static __inline__ int sync_block_swab32 (struct inode * inode, u32 * block, int wait)
|
static __inline__ int sync_block_swab32 (struct inode * inode, u32 * block, int wait)
|
{
|
{
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
int tmp;
|
int tmp;
|
|
|
if (!swab32(*block))
|
if (!swab32(*block))
|
return 0;
|
return 0;
|
tmp = swab32(*block);
|
tmp = swab32(*block);
|
bh = get_hash_table (inode->i_dev, swab32(*block), blocksize);
|
bh = get_hash_table (inode->i_dev, swab32(*block), blocksize);
|
if (!bh)
|
if (!bh)
|
return 0;
|
return 0;
|
if (swab32(*block) != tmp) {
|
if (swab32(*block) != tmp) {
|
brelse (bh);
|
brelse (bh);
|
return 1;
|
return 1;
|
}
|
}
|
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
|
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
|
brelse (bh);
|
brelse (bh);
|
return -1;
|
return -1;
|
}
|
}
|
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
|
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
|
brelse (bh);
|
brelse (bh);
|
return 0;
|
return 0;
|
}
|
}
|
ll_rw_block (WRITE, 1, &bh);
|
ll_rw_block (WRITE, 1, &bh);
|
bh->b_count--;
|
bh->b_count--;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static __inline__ int sync_iblock (struct inode * inode, u32 * iblock,
|
static __inline__ int sync_iblock (struct inode * inode, u32 * iblock,
|
struct buffer_head ** bh, int wait)
|
struct buffer_head ** bh, int wait)
|
{
|
{
|
int rc, tmp;
|
int rc, tmp;
|
|
|
*bh = NULL;
|
*bh = NULL;
|
tmp = *iblock;
|
tmp = *iblock;
|
if (!tmp)
|
if (!tmp)
|
return 0;
|
return 0;
|
rc = sync_block (inode, iblock, wait);
|
rc = sync_block (inode, iblock, wait);
|
if (rc)
|
if (rc)
|
return rc;
|
return rc;
|
*bh = bread (inode->i_dev, tmp, blocksize);
|
*bh = bread (inode->i_dev, tmp, blocksize);
|
if (tmp != *iblock) {
|
if (tmp != *iblock) {
|
brelse (*bh);
|
brelse (*bh);
|
*bh = NULL;
|
*bh = NULL;
|
return 1;
|
return 1;
|
}
|
}
|
if (!*bh)
|
if (!*bh)
|
return -1;
|
return -1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static __inline__ int sync_iblock_swab32 (struct inode * inode, u32 * iblock,
|
static __inline__ int sync_iblock_swab32 (struct inode * inode, u32 * iblock,
|
struct buffer_head ** bh, int wait)
|
struct buffer_head ** bh, int wait)
|
{
|
{
|
int rc, tmp;
|
int rc, tmp;
|
|
|
*bh = NULL;
|
*bh = NULL;
|
tmp = swab32(*iblock);
|
tmp = swab32(*iblock);
|
if (!tmp)
|
if (!tmp)
|
return 0;
|
return 0;
|
rc = sync_block_swab32 (inode, iblock, wait);
|
rc = sync_block_swab32 (inode, iblock, wait);
|
if (rc)
|
if (rc)
|
return rc;
|
return rc;
|
*bh = bread (inode->i_dev, tmp, blocksize);
|
*bh = bread (inode->i_dev, tmp, blocksize);
|
if (tmp != swab32(*iblock)) {
|
if (tmp != swab32(*iblock)) {
|
brelse (*bh);
|
brelse (*bh);
|
*bh = NULL;
|
*bh = NULL;
|
return 1;
|
return 1;
|
}
|
}
|
if (!*bh)
|
if (!*bh)
|
return -1;
|
return -1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
static __inline__ int sync_direct (struct inode * inode, int wait)
|
static __inline__ int sync_direct (struct inode * inode, int wait)
|
{
|
{
|
int i;
|
int i;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
for (i = 0; i < EXT2_NDIR_BLOCKS; i++) {
|
for (i = 0; i < EXT2_NDIR_BLOCKS; i++) {
|
rc = sync_block (inode, inode->u.ext2_i.i_data + i, wait);
|
rc = sync_block (inode, inode->u.ext2_i.i_data + i, wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
return err;
|
return err;
|
}
|
}
|
|
|
static __inline__ int sync_indirect (struct inode * inode, u32 * iblock, int wait)
|
static __inline__ int sync_indirect (struct inode * inode, u32 * iblock, int wait)
|
{
|
{
|
int i;
|
int i;
|
struct buffer_head * ind_bh;
|
struct buffer_head * ind_bh;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
rc = sync_iblock (inode, iblock, &ind_bh, wait);
|
rc = sync_iblock (inode, iblock, &ind_bh, wait);
|
if (rc || !ind_bh)
|
if (rc || !ind_bh)
|
return rc;
|
return rc;
|
|
|
for (i = 0; i < addr_per_block; i++) {
|
for (i = 0; i < addr_per_block; i++) {
|
rc = sync_block_swab32 (inode,
|
rc = sync_block_swab32 (inode,
|
((u32 *) ind_bh->b_data) + i,
|
((u32 *) ind_bh->b_data) + i,
|
wait);
|
wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
brelse (ind_bh);
|
brelse (ind_bh);
|
return err;
|
return err;
|
}
|
}
|
|
|
static __inline__ int sync_indirect_swab32 (struct inode * inode, u32 * iblock, int wait)
|
static __inline__ int sync_indirect_swab32 (struct inode * inode, u32 * iblock, int wait)
|
{
|
{
|
int i;
|
int i;
|
struct buffer_head * ind_bh;
|
struct buffer_head * ind_bh;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
rc = sync_iblock_swab32 (inode, iblock, &ind_bh, wait);
|
rc = sync_iblock_swab32 (inode, iblock, &ind_bh, wait);
|
if (rc || !ind_bh)
|
if (rc || !ind_bh)
|
return rc;
|
return rc;
|
|
|
for (i = 0; i < addr_per_block; i++) {
|
for (i = 0; i < addr_per_block; i++) {
|
rc = sync_block_swab32 (inode,
|
rc = sync_block_swab32 (inode,
|
((u32 *) ind_bh->b_data) + i,
|
((u32 *) ind_bh->b_data) + i,
|
wait);
|
wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
brelse (ind_bh);
|
brelse (ind_bh);
|
return err;
|
return err;
|
}
|
}
|
|
|
static __inline__ int sync_dindirect (struct inode * inode, u32 * diblock, int wait)
|
static __inline__ int sync_dindirect (struct inode * inode, u32 * diblock, int wait)
|
{
|
{
|
int i;
|
int i;
|
struct buffer_head * dind_bh;
|
struct buffer_head * dind_bh;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
rc = sync_iblock (inode, diblock, &dind_bh, wait);
|
rc = sync_iblock (inode, diblock, &dind_bh, wait);
|
if (rc || !dind_bh)
|
if (rc || !dind_bh)
|
return rc;
|
return rc;
|
|
|
for (i = 0; i < addr_per_block; i++) {
|
for (i = 0; i < addr_per_block; i++) {
|
rc = sync_indirect_swab32 (inode,
|
rc = sync_indirect_swab32 (inode,
|
((u32 *) dind_bh->b_data) + i,
|
((u32 *) dind_bh->b_data) + i,
|
wait);
|
wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
brelse (dind_bh);
|
brelse (dind_bh);
|
return err;
|
return err;
|
}
|
}
|
|
|
static __inline__ int sync_dindirect_swab32 (struct inode * inode, u32 * diblock, int wait)
|
static __inline__ int sync_dindirect_swab32 (struct inode * inode, u32 * diblock, int wait)
|
{
|
{
|
int i;
|
int i;
|
struct buffer_head * dind_bh;
|
struct buffer_head * dind_bh;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
rc = sync_iblock_swab32 (inode, diblock, &dind_bh, wait);
|
rc = sync_iblock_swab32 (inode, diblock, &dind_bh, wait);
|
if (rc || !dind_bh)
|
if (rc || !dind_bh)
|
return rc;
|
return rc;
|
|
|
for (i = 0; i < addr_per_block; i++) {
|
for (i = 0; i < addr_per_block; i++) {
|
rc = sync_indirect_swab32 (inode,
|
rc = sync_indirect_swab32 (inode,
|
((u32 *) dind_bh->b_data) + i,
|
((u32 *) dind_bh->b_data) + i,
|
wait);
|
wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
brelse (dind_bh);
|
brelse (dind_bh);
|
return err;
|
return err;
|
}
|
}
|
|
|
static __inline__ int sync_tindirect (struct inode * inode, u32 * tiblock, int wait)
|
static __inline__ int sync_tindirect (struct inode * inode, u32 * tiblock, int wait)
|
{
|
{
|
int i;
|
int i;
|
struct buffer_head * tind_bh;
|
struct buffer_head * tind_bh;
|
int rc, err = 0;
|
int rc, err = 0;
|
|
|
rc = sync_iblock (inode, tiblock, &tind_bh, wait);
|
rc = sync_iblock (inode, tiblock, &tind_bh, wait);
|
if (rc || !tind_bh)
|
if (rc || !tind_bh)
|
return rc;
|
return rc;
|
|
|
for (i = 0; i < addr_per_block; i++) {
|
for (i = 0; i < addr_per_block; i++) {
|
rc = sync_dindirect_swab32 (inode,
|
rc = sync_dindirect_swab32 (inode,
|
((u32 *) tind_bh->b_data) + i,
|
((u32 *) tind_bh->b_data) + i,
|
wait);
|
wait);
|
if (rc > 0)
|
if (rc > 0)
|
break;
|
break;
|
if (rc)
|
if (rc)
|
err = rc;
|
err = rc;
|
}
|
}
|
brelse (tind_bh);
|
brelse (tind_bh);
|
return err;
|
return err;
|
}
|
}
|
|
|
int ext2_sync_file (struct inode * inode, struct file * file)
|
int ext2_sync_file (struct inode * inode, struct file * file)
|
{
|
{
|
int wait, err = 0;
|
int wait, err = 0;
|
|
|
if (S_ISLNK(inode->i_mode) && !(inode->i_blocks))
|
if (S_ISLNK(inode->i_mode) && !(inode->i_blocks))
|
/*
|
/*
|
* Don't sync fast links!
|
* Don't sync fast links!
|
*/
|
*/
|
goto skip;
|
goto skip;
|
|
|
/* fsync on large files is *slow*, so fall back to sync() if
|
/* fsync on large files is *slow*, so fall back to sync() if
|
* the file's over 10M */
|
* the file's over 10M */
|
if (inode->i_size>10000000) {
|
if (inode->i_size>10000000) {
|
file_fsync(inode,file);
|
file_fsync(inode,file);
|
goto skip;
|
goto skip;
|
}
|
}
|
|
|
for (wait=0; wait<=1; wait++)
|
for (wait=0; wait<=1; wait++)
|
{
|
{
|
err |= sync_direct (inode, wait);
|
err |= sync_direct (inode, wait);
|
err |= sync_indirect (inode,
|
err |= sync_indirect (inode,
|
inode->u.ext2_i.i_data+EXT2_IND_BLOCK,
|
inode->u.ext2_i.i_data+EXT2_IND_BLOCK,
|
wait);
|
wait);
|
err |= sync_dindirect (inode,
|
err |= sync_dindirect (inode,
|
inode->u.ext2_i.i_data+EXT2_DIND_BLOCK,
|
inode->u.ext2_i.i_data+EXT2_DIND_BLOCK,
|
wait);
|
wait);
|
err |= sync_tindirect (inode,
|
err |= sync_tindirect (inode,
|
inode->u.ext2_i.i_data+EXT2_TIND_BLOCK,
|
inode->u.ext2_i.i_data+EXT2_TIND_BLOCK,
|
wait);
|
wait);
|
}
|
}
|
skip:
|
skip:
|
err |= ext2_sync_inode (inode);
|
err |= ext2_sync_inode (inode);
|
return (err < 0) ? -EIO : 0;
|
return (err < 0) ? -EIO : 0;
|
}
|
}
|
|
|
