[to-be-updated] ext4-nowait-aio-support.patch removed from -mm tree

[to-be-updated] ext4-nowait-aio-support.patch removed from -mm tree

[akpm]

The patch titled
     Subject: ext4: nowait aio support
has been removed from the -mm tree.  Its filename was
     ext4-nowait-aio-support.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: ext4: nowait aio support

Return EAGAIN if any of the following checks fail for direct I/O:
  + i_rwsem is lockable
  + Writing beyond end of file (will trigger allocation)
  + Blocks are not allocated at the write location

Link: http://lkml.kernel.org/r/20170615160002.17233-9-rgoldwyn@suse.de
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Chris Mason <clm@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Josef Bacik <jbacik@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ext4/file.c |   24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff -puN fs/ext4/file.c~ext4-nowait-aio-support fs/ext4/file.c
--- a/fs/ext4/file.c~ext4-nowait-aio-support
+++ a/fs/ext4/file.c
@@ -216,7 +216,13 @@ ext4_file_write_iter(struct kiocb *iocb,
 		return ext4_dax_write_iter(iocb, from);
 #endif
 
-	inode_lock(inode);
+	if (iocb->ki_flags & IOCB_NOWAIT) {
+		if (!inode_trylock(inode))
+			return -EAGAIN;
+	} else {
+		inode_lock(inode);
+	}
+
 	ret = ext4_write_checks(iocb, from);
 	if (ret <= 0)
 		goto out;
@@ -235,9 +241,15 @@ ext4_file_write_iter(struct kiocb *iocb,
 
 	iocb->private = &overwrite;
 	/* Check whether we do a DIO overwrite or not */
-	if (o_direct && ext4_should_dioread_nolock(inode) && !unaligned_aio &&
-	    ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from)))
-		overwrite = 1;
+	if (o_direct && !unaligned_aio) {
+		if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) {
+			if (ext4_should_dioread_nolock(inode))
+				overwrite = 1;
+		} else if (iocb->ki_flags & IOCB_NOWAIT) {
+			ret = -EAGAIN;
+			goto out;
+		}
+	}
 
 	ret = __generic_file_write_iter(iocb, from);
 	inode_unlock(inode);
@@ -435,6 +447,10 @@ static int ext4_file_open(struct inode *
 		if (ret < 0)
 			return ret;
 	}
+
+	/* Set the flags to support nowait AIO */
+	filp->f_mode |= FMODE_NOWAIT_AIO;
+
 	return dquot_file_open(inode, filp);
 }
 
_

Patches currently in -mm which might be from rgoldwyn@suse.com are

xfs-nowait-aio-support.patch
btrfs-nowait-aio-support.patch