On Tue, Mar 29, 2022 at 12:57:23PM -0700, Omar Sandoval wrote:
On Mon, Mar 28, 2022 at 03:41:47PM -0400, Sasha Levin wrote:
From: Omar Sandoval <osandov@xxxxxx>
[ Upstream commit e331f6b19f8adde2307588bb325ae5de78617c20 ]
btrfs_csum_one_bio() loops over each filesystem block in the bio while
keeping a cursor of its current logical position in the file in order to
look up the ordered extent to add the checksums to. However, this
doesn't make much sense for compressed extents, as a sector on disk does
not correspond to a sector of decompressed file data. It happens to work
because:
1) the compressed bio always covers one ordered extent
2) the size of the bio is always less than the size of the ordered
extent
However, the second point will not always be true for encoded writes.
Let's add a boolean parameter to btrfs_csum_one_bio() to indicate that
it can assume that the bio only covers one ordered extent. Since we're
already changing the signature, let's get rid of the contig parameter
and make it implied by the offset parameter, similar to the change we
recently made to btrfs_lookup_bio_sums(). Additionally, let's rename
nr_sectors to blockcount to make it clear that it's the number of
filesystem blocks, not the number of 512-byte sectors.
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/btrfs/compression.c | 2 +-
fs/btrfs/ctree.h | 2 +-
fs/btrfs/file-item.c | 37 +++++++++++++++++--------------------
fs/btrfs/inode.c | 8 ++++----
4 files changed, 23 insertions(+), 26 deletions(-)
Hi, Sasha,
This patch doesn't fix a real bug, so it should be dropped from both
5.16 and 5.17.
I'll drop it, thanks.
--
Thanks,
Sasha
