Goldwyn Rodrigues b745fafaf7
fs: Introduce RWF_NOWAIT and FMODE_AIO_NOWAIT ...
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 >
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