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Fix btrfs balance/scrub issue (rhbz 1011714)

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This commit is contained in:
Josh Boyer 2013-10-16 13:50:26 -04:00
parent 458031cff9
commit c517fd6ab4
2 changed files with 67 additions and 0 deletions
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60
btrfs-relocate-csums-properly-with-prealloc-ext.patch Normal file
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@ -0,0 +1,60 @@
A user reported a problem where they were getting csum errors when running a
balance and running systemd's journal. This is because systemd is awesome and
fallocate()'s its log space and writes into it. Unfortunately we assume that
when we read in all the csums for an extent that they are sequential starting at
the bytenr we care about. This obviously isn't the case for prealloc extents,
where we could have written to the middle of the prealloc extent only, which
means the csum would be for the bytenr in the middle of our range and not the
front of our range. Fix this by offsetting the new bytenr we are logging to
based on the original bytenr the csum was for. With this patch I no longer see
the csum errors I was seeing. Thanks,
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
---
fs/btrfs/relocation.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 5ca7ea9..b7afeaa 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4472,6 +4472,7 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
u64 disk_bytenr;
+ u64 new_bytenr;
LIST_HEAD(list);
ordered = btrfs_lookup_ordered_extent(inode, file_pos);
@@ -4483,13 +4484,24 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
if (ret)
goto out;
- disk_bytenr = ordered->start;
while (!list_empty(&list)) {
sums = list_entry(list.next, struct btrfs_ordered_sum, list);
list_del_init(&sums->list);
- sums->bytenr = disk_bytenr;
- disk_bytenr += sums->len;
+ /*
+ * We need to offset the new_bytenr based on where the csum is.
+ * We need to do this because we will read in entire prealloc
+ * extents but we may have written to say the middle of the
+ * prealloc extent, so we need to make sure the csum goes with
+ * the right disk offset.
+ *
+ * We can do this because the data reloc inode refers strictly
+ * to the on disk bytes, so we don't have to worry about
+ * disk_len vs real len like with real inodes since it's all
+ * disk length.
+ */
+ new_bytenr = ordered->start + (sums->bytenr - disk_bytenr);
+ sums->bytenr = new_bytenr;
btrfs_add_ordered_sum(inode, ordered, sums);
}
--
1.8.3.1

7
kernel.spec
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@ -742,6 +742,9 @@ Patch25128: dm-cache-policy-mq_fix-large-scale-table-allocation-bug.patch
#rhbz 1000439
Patch25129: cpupower-Fix-segfault-due-to-incorrect-getopt_long-a.patch
#rhbz 1011714
Patch25131: btrfs-relocate-csums-properly-with-prealloc-ext.patch
# END OF PATCH DEFINITIONS
%endif
@ -1441,6 +1444,9 @@ ApplyPatch dm-cache-policy-mq_fix-large-scale-table-allocation-bug.patch
#rhbz 1000439
ApplyPatch cpupower-Fix-segfault-due-to-incorrect-getopt_long-a.patch
#rhbz 1011714
ApplyPatch btrfs-relocate-csums-properly-with-prealloc-ext.patch
# END OF PATCH APPLICATIONS
%endif
@ -2245,6 +2251,7 @@ fi
# || ||
%changelog
* Wed Oct 16 2013 Josh Boyer <jwboyer@fedoraproject.org>
- Fix btrfs balance/scrub issue (rhbz 1011714)
- Clean up a bunch of stale patches
* Wed Oct 16 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc5.git2.1