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| author | Liu Bo <bo.li.liu@oracle.com> | 2016-12-22 17:13:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-06 19:19:46 -0700 |
| commit | 786fd31f6001c0f429797b10e8ff16838794fce2 (patch) | |
| tree | 5806bd80b10c20b0086fe91b68c13ef3a4ee21c1 /fs/btrfs | |
| parent | 7ea3cc440ec9f3c53fdc54f59248d19f2d29106c (diff) | |
| download | linux-stable-786fd31f6001c0f429797b10e8ff16838794fce2.tar.gz linux-stable-786fd31f6001c0f429797b10e8ff16838794fce2.tar.bz2 linux-stable-786fd31f6001c0f429797b10e8ff16838794fce2.zip | |
Btrfs: adjust outstanding_extents counter properly when dio write is split
[ Upstream commit c2931667c83ded6504b3857e99cc45b21fa496fb ]
Currently how btrfs dio deals with split dio write is not good
enough if dio write is split into several segments due to the
lack of contiguous space, a large dio write like 'dd bs=1G count=1'
can end up with incorrect outstanding_extents counter and endio
would complain loudly with an assertion.
This fixes the problem by compensating the outstanding_extents
counter in inode if a large dio write gets split.
Reported-by: Anand Jain <anand.jain@oracle.com>
Tested-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/inode.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a61926cb01c0..bebd6517355d 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7521,11 +7521,18 @@ static void adjust_dio_outstanding_extents(struct inode *inode, * within our reservation, otherwise we need to adjust our inode * counter appropriately. */ - if (dio_data->outstanding_extents) { + if (dio_data->outstanding_extents >= num_extents) { dio_data->outstanding_extents -= num_extents; } else { + /* + * If dio write length has been split due to no large enough + * contiguous space, we need to compensate our inode counter + * appropriately. + */ + u64 num_needed = num_extents - dio_data->outstanding_extents; + spin_lock(&BTRFS_I(inode)->lock); - BTRFS_I(inode)->outstanding_extents += num_extents; + BTRFS_I(inode)->outstanding_extents += num_needed; spin_unlock(&BTRFS_I(inode)->lock); } } |