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authorChristoph Hellwig <hch@lst.de>2017-08-29 16:13:20 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2017-09-04 19:04:23 -0400
commit91f9943e1c7b6638f27312d03fe71fcc67b23571 (patch)
treebf9c2212d93f4fbf9af6f5fafc2e667fa3d29de1 /fs/btrfs/file.c
parent3239d834847627b6634a4139cf1dc58f6f137a46 (diff)
fs: support RWF_NOWAIT for buffered reads
This is based on the old idea and code from Milosz Tanski. With the aio nowait code it becomes mostly trivial now. Buffered writes continue to return -EOPNOTSUPP if RWF_NOWAIT is passed. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 9e75d8a39aac..e62dd55b4079 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1886,6 +1886,10 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
loff_t oldsize;
int clean_page = 0;
+ if (!(iocb->ki_flags & IOCB_DIRECT) &&
+ (iocb->ki_flags & IOCB_NOWAIT))
+ return -EOPNOTSUPP;
+
if (!inode_trylock(inode)) {
if (iocb->ki_flags & IOCB_NOWAIT)
return -EAGAIN;
@@ -3105,7 +3109,7 @@ out:
static int btrfs_file_open(struct inode *inode, struct file *filp)
{
- filp->f_mode |= FMODE_AIO_NOWAIT;
+ filp->f_mode |= FMODE_NOWAIT;
return generic_file_open(inode, filp);
}