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dir_index: error out instead of BUG on corrupt dx dirs

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Convert asserts (BUGs) in dx_probe from bad on-disk data to recoverable
errors with helpful warnings.  With help catching other asserts from Duane
Griffin <duaneg@dghda.com>

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Duane Griffin <duaneg@dghda.com>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Sandeen 2007-09-18 22:46:38 -07:00 committed by Linus Torvalds
parent e67aa27a61
commit 3d82abae95
2 changed files with 60 additions and 8 deletions
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34
fs/ext3/namei.c
View file

@ -379,13 +379,28 @@ dx_probe(struct dentry *dentry, struct inode *dir,
entries = (struct dx_entry *) (((char *)&root->info) +
root->info.info_length);
assert(dx_get_limit(entries) == dx_root_limit(dir,
root->info.info_length));
if (dx_get_limit(entries) != dx_root_limit(dir,
root->info.info_length)) {
ext3_warning(dir->i_sb, __FUNCTION__,
"dx entry: limit != root limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail;
}
dxtrace (printk("Look up %x", hash));
while (1)
{
count = dx_get_count(entries);
assert (count && count <= dx_get_limit(entries));
if (!count || count > dx_get_limit(entries)) {
ext3_warning(dir->i_sb, __FUNCTION__,
"dx entry: no count or count > limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail2;
}
p = entries + 1;
q = entries + count - 1;
while (p <= q)
@ -423,8 +438,15 @@ dx_probe(struct dentry *dentry, struct inode *dir,
if (!(bh = ext3_bread (NULL,dir, dx_get_block(at), 0, err)))
goto fail2;
at = entries = ((struct dx_node *) bh->b_data)->entries;
assert (dx_get_limit(entries) == dx_node_limit (dir));
if (dx_get_limit(entries) != dx_node_limit (dir)) {
ext3_warning(dir->i_sb, __FUNCTION__,
"dx entry: limit != node limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail2;
}
frame++;
frame->bh = NULL;
}
fail2:
while (frame >= frame_in) {
@ -432,6 +454,10 @@ dx_probe(struct dentry *dentry, struct inode *dir,
frame--;
}
fail:
if (*err == ERR_BAD_DX_DIR)
ext3_warning(dir->i_sb, __FUNCTION__,
"Corrupt dir inode %ld, running e2fsck is "
"recommended.", dir->i_ino);
return NULL;
}

34
fs/ext4/namei.c
View file

@ -379,13 +379,28 @@ dx_probe(struct dentry *dentry, struct inode *dir,
entries = (struct dx_entry *) (((char *)&root->info) +
root->info.info_length);
assert(dx_get_limit(entries) == dx_root_limit(dir,
root->info.info_length));
if (dx_get_limit(entries) != dx_root_limit(dir,
root->info.info_length)) {
ext4_warning(dir->i_sb, __FUNCTION__,
"dx entry: limit != root limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail;
}
dxtrace (printk("Look up %x", hash));
while (1)
{
count = dx_get_count(entries);
assert (count && count <= dx_get_limit(entries));
if (!count || count > dx_get_limit(entries)) {
ext4_warning(dir->i_sb, __FUNCTION__,
"dx entry: no count or count > limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail2;
}
p = entries + 1;
q = entries + count - 1;
while (p <= q)
@ -423,8 +438,15 @@ dx_probe(struct dentry *dentry, struct inode *dir,
if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err)))
goto fail2;
at = entries = ((struct dx_node *) bh->b_data)->entries;
assert (dx_get_limit(entries) == dx_node_limit (dir));
if (dx_get_limit(entries) != dx_node_limit (dir)) {
ext4_warning(dir->i_sb, __FUNCTION__,
"dx entry: limit != node limit");
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto fail2;
}
frame++;
frame->bh = NULL;
}
fail2:
while (frame >= frame_in) {
@ -432,6 +454,10 @@ dx_probe(struct dentry *dentry, struct inode *dir,
frame--;
}
fail:
if (*err == ERR_BAD_DX_DIR)
ext4_warning(dir->i_sb, __FUNCTION__,
"Corrupt dir inode %ld, running e2fsck is "
"recommended.", dir->i_ino);
return NULL;
}