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fs: Introduce RWF_NOWAIT and FMODE_AIO_NOWAIT

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RWF_NOWAIT informs kernel to bail out if an AIO request will block
for reasons such as file allocations, or a writeback triggered,
or would block while allocating requests while performing
direct I/O.

RWF_NOWAIT is translated to IOCB_NOWAIT for iocb->ki_flags.

FMODE_AIO_NOWAIT is a flag which identifies the file opened is capable
of returning -EAGAIN if the AIO call will block. This must be set by
supporting filesystems in the ->open() call.

Filesystems xfs, btrfs and ext4 would be supported in the following patches.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Goldwyn Rodrigues
2017-06-20 07:05:43 -05:00
committed by Jens Axboe
parent 9830f4be15
commit b745fafaf7
3 changed files with 18 additions and 1 deletions
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4
include/uapi/linux/fs.h
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@@ -360,7 +360,9 @@ struct fscrypt_key {
#define RWF_HIPRI 0x00000001 /* high priority request, poll if possible */
#define RWF_DSYNC 0x00000002 /* per-IO O_DSYNC */
#define RWF_SYNC 0x00000004 /* per-IO O_SYNC */
#define RWF_NOWAIT 0x00000008 /* per-IO, return -EAGAIN if operation would block */
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC)
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC |\
RWF_NOWAIT)
#endif /* _UAPI_LINUX_FS_H */