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ext4: Validate extent details only when read from the disk

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Make sure we validate extent details only when read from the disk.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Thiemo Nagel <thiemo.nagel@ph.tum.de>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V
2009-03-27 16:39:58 -04:00
committed by Theodore Ts'o
parent 56b19868ac
commit 7a262f7c69
3 changed files with 29 additions and 7 deletions
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25
fs/ext4/extents.c
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@@ -429,6 +429,11 @@ corrupted:
#define ext4_ext_check(inode, eh, depth) \
__ext4_ext_check(__func__, inode, eh, depth)
int ext4_ext_check_inode(struct inode *inode)
{
return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode));
}
#ifdef EXT_DEBUG
static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
{
@@ -631,9 +636,6 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
eh = ext_inode_hdr(inode);
depth = ext_depth(inode);
if (ext4_ext_check(inode, eh, depth))
return ERR_PTR(-EIO);
/* account possible depth increase */
if (!path) {
@@ -649,6 +651,8 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
i = depth;
/* walk through the tree */
while (i) {
int need_to_validate = 0;
ext_debug("depth %d: num %d, max %d\n",
ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
@@ -657,10 +661,17 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
path[ppos].p_depth = i;
path[ppos].p_ext = NULL;
bh = sb_bread(inode->i_sb, path[ppos].p_block);
if (!bh)
bh = sb_getblk(inode->i_sb, path[ppos].p_block);
if (unlikely(!bh))
goto err;
if (!bh_uptodate_or_lock(bh)) {
if (bh_submit_read(bh) < 0) {
put_bh(bh);
goto err;
}
/* validate the extent entries */
need_to_validate = 1;
}
eh = ext_block_hdr(bh);
ppos++;
BUG_ON(ppos > depth);
@@ -668,7 +679,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
path[ppos].p_hdr = eh;
i--;
if (ext4_ext_check(inode, eh, i))
if (need_to_validate && ext4_ext_check(inode, eh, i))
goto err;
}