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authorOmar Sandoval <osandov@fb.com>2019-08-15 14:04:03 -0700
committerDavid Sterba <dsterba@suse.com>2019-09-09 14:59:17 +0200
commitf50cb7aff9645998b3269eac903a5e01cd6ba689 (patch)
tree34d4341ea2465a68e03ffe87c5ae6597b5c70be2 /fs/btrfs
parentc09767a8960ca0500fb636bf73686723337debf4 (diff)
downloadlinux-f50cb7aff9645998b3269eac903a5e01cd6ba689.tar.bz2
btrfs: treat RWF_{,D}SYNC writes as sync for CRCs
The VFS indicates a synchronous write to ->write_iter() via iocb->ki_flags. The IOCB_{,D}SYNC flags may be set based on the file (see iocb_flags()) or the RWF_* flags passed to a syscall like pwritev2() (see kiocb_set_rw_flags()). However, in btrfs_file_write_iter(), we're checking if a write is synchronous based only on the file; we use this to decide when to bump the sync_writers counter and thus do CRCs synchronously. Make sure we do this for all synchronous writes as determined by the VFS. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> [ add const ] Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 25df5b03b591..702c30a28a43 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1882,7 +1882,7 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
u64 start_pos;
u64 end_pos;
ssize_t num_written = 0;
- bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host);
+ const bool sync = iocb->ki_flags & IOCB_DSYNC;
ssize_t err;
loff_t pos;
size_t count;