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Commit e253d98f authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull nowait read support from Al Viro:
 "Support IOCB_NOWAIT for buffered reads and block devices"

* 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  block_dev: support RFW_NOWAIT on block device nodes
  fs: support RWF_NOWAIT for buffered reads
  fs: support IOCB_NOWAIT in generic_file_buffered_read
  fs: pass iocb to do_generic_file_read
parents 0f0d1272 c35fc7a5

fs/aio.c

+0 −6
Original line number Diff line number Diff line
@@ -1606,12 +1606,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, 
		goto out_put_req;

	}



	if ((req->common.ki_flags & IOCB_NOWAIT) &&

			!(req->common.ki_flags & IOCB_DIRECT)) {

		ret = -EOPNOTSUPP;

		goto out_put_req;

	}



	ret = put_user(KIOCB_KEY, &user_iocb->aio_key);

	if (unlikely(ret)) {

		pr_debug("EFAULT: aio_key\n");

fs/block_dev.c

+5 −0
Original line number Diff line number Diff line
@@ -1740,6 +1740,8 @@ static int blkdev_open(struct inode * inode, struct file * filp) 
	 */

	filp->f_flags |= O_LARGEFILE;



	filp->f_mode |= FMODE_NOWAIT;



	if (filp->f_flags & O_NDELAY)

		filp->f_mode |= FMODE_NDELAY;

	if (filp->f_flags & O_EXCL)
@@ -1892,6 +1894,9 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) 
	if (iocb->ki_pos >= size)

		return -ENOSPC;



	if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT)

		return -EOPNOTSUPP;



	iov_iter_truncate(from, size - iocb->ki_pos);



	blk_start_plug(&plug);

fs/btrfs/file.c

+5 −1
Original line number Diff line number Diff line
@@ -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;
@@ -3112,7 +3116,7 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) 


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);

}

fs/ext4/file.c

+3 −3
Original line number Diff line number Diff line
@@ -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)
@@ -431,9 +433,7 @@ 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);

}

fs/xfs/xfs_file.c

+9 −2
Original line number Diff line number Diff line
@@ -259,7 +259,11 @@ xfs_file_buffered_aio_read( 


	trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos);



	if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) {

		if (iocb->ki_flags & IOCB_NOWAIT)

			return -EAGAIN;

		xfs_ilock(ip, XFS_IOLOCK_SHARED);

	}

	ret = generic_file_read_iter(iocb, to);

	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
@@ -636,6 +640,9 @@ xfs_file_buffered_aio_write( 
	int			enospc = 0;

	int			iolock;



	if (iocb->ki_flags & IOCB_NOWAIT)

		return -EOPNOTSUPP;



write_retry:

	iolock = XFS_IOLOCK_EXCL;

	xfs_ilock(ip, iolock);
@@ -912,7 +919,7 @@ xfs_file_open( 
		return -EFBIG;

	if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb)))

		return -EIO;

	file->f_mode |= FMODE_AIO_NOWAIT;

	file->f_mode |= FMODE_NOWAIT;

	return 0;

}