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fs: support RWF_NOWAIT for buffered reads

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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 <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-08-29 16:13:20 +02:00 • committed by Al Viro
commit 91f9943e1c
5 changed files with 20 additions and 15 deletions
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6
fs/ext4/file.c
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@ -223,6 +223,8 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (IS_DAX(inode))
return ext4_dax_write_iter(iocb, from);
#endif
if (!o_direct && (iocb->ki_flags & IOCB_NOWAIT))
return -EOPNOTSUPP;
if (!inode_trylock(inode)) {
if (iocb->ki_flags & IOCB_NOWAIT)
@ -448,9 +450,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
return ret;
}
/* Set the flags to support nowait AIO */
filp->f_mode |= FMODE_AIO_NOWAIT;
filp->f_mode |= FMODE_NOWAIT;
return dquot_file_open(inode, filp);
}