This is a note to let you know that I've just added the patch titled
btrfs: fix error handling in btrfs_del_csums
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-fix-error-handling-in-btrfs_del_csums.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b86652be7c83f70bf406bed18ecf55adb9bfb91b Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@xxxxxxxxxxxxxx>
Date: Wed, 19 May 2021 10:52:45 -0400
Subject: btrfs: fix error handling in btrfs_del_csums
From: Josef Bacik <josef@xxxxxxxxxxxxxx>
commit b86652be7c83f70bf406bed18ecf55adb9bfb91b upstream.
Error injection stress would sometimes fail with checksums on disk that
did not have a corresponding extent. This occurred because the pattern
in btrfs_del_csums was
while (1) {
ret = btrfs_search_slot();
if (ret < 0)
break;
}
ret = 0;
out:
btrfs_free_path(path);
return ret;
If we got an error from btrfs_search_slot we'd clear the error because
we were breaking instead of goto out. Instead of using goto out, simply
handle the cases where we may leave a random value in ret, and get rid
of the
ret = 0;
out:
pattern and simply allow break to have the proper error reporting. With
this fix we properly abort the transaction and do not commit thinking we
successfully deleted the csum.
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 4.4+
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/file-item.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -599,7 +599,7 @@ int btrfs_del_csums(struct btrfs_trans_h
u64 end_byte = bytenr + len;
u64 csum_end;
struct extent_buffer *leaf;
- int ret;
+ int ret = 0;
u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
int blocksize_bits = fs_info->sb->s_blocksize_bits;
@@ -618,6 +618,7 @@ int btrfs_del_csums(struct btrfs_trans_h
path->leave_spinning = 1;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0) {
+ ret = 0;
if (path->slots[0] == 0)
break;
path->slots[0]--;
@@ -674,7 +675,7 @@ int btrfs_del_csums(struct btrfs_trans_h
ret = btrfs_del_items(trans, root, path,
path->slots[0], del_nr);
if (ret)
- goto out;
+ break;
if (key.offset == bytenr)
break;
} else if (key.offset < bytenr && csum_end > end_byte) {
@@ -718,8 +719,9 @@ int btrfs_del_csums(struct btrfs_trans_h
ret = btrfs_split_item(trans, root, path, &key, offset);
if (ret && ret != -EAGAIN) {
btrfs_abort_transaction(trans, ret);
- goto out;
+ break;
}
+ ret = 0;
key.offset = end_byte - 1;
} else {
@@ -729,8 +731,6 @@ int btrfs_del_csums(struct btrfs_trans_h
}
btrfs_release_path(path);
}
- ret = 0;
-out:
btrfs_free_path(path);
return ret;
}
Patches currently in stable-queue which might be from josef@xxxxxxxxxxxxxx are
queue-5.4/btrfs-fixup-error-handling-in-fixup_inode_link_counts.patch
queue-5.4/btrfs-tree-checker-do-not-error-out-if-extent-ref-ha.patch
queue-5.4/btrfs-mark-ordered-extent-and-inode-with-error-if-we-fail-to-finish.patch
queue-5.4/btrfs-fix-error-handling-in-btrfs_del_csums.patch
queue-5.4/btrfs-return-errors-from-btrfs_del_csums-in-cleanup_ref_head.patch
