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| author | Christoph Hellwig | 2017-08-29 16:13:20 +0200 |
|---|---|---|
| committer | Al Viro | 2017-09-05 01:04:23 +0200 |
| commit | 91f9943e1c7b6638f27312d03fe71fcc67b23571 (patch) | |
| tree | bf9c2212d93f4fbf9af6f5fafc2e667fa3d29de1 /fs/btrfs/file.c | |
| parent | fs: support IOCB_NOWAIT in generic_file_buffered_read (diff) | |
| download | kernel-qcow2-linux-91f9943e1c7b6638f27312d03fe71fcc67b23571.tar.gz kernel-qcow2-linux-91f9943e1c7b6638f27312d03fe71fcc67b23571.tar.xz kernel-qcow2-linux-91f9943e1c7b6638f27312d03fe71fcc67b23571.zip | |
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.c | 6 |
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); } |