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authorChristoph Hellwig <hch@lst.de>2020-02-21 15:37:23 +0100
committerDamien Le Moal <damien.lemoal@wdc.com>2020-02-26 08:57:35 +0100
commit7c69eb84d98a28c428f902318c20c53cf29c9084 (patch)
tree674f4411f5b60f68a8604e9fbf7192ff286382e7 /fs/zonefs
parentzonefs: fix documentation typos etc. (diff)
downloadlinux-7c69eb84d98a28c428f902318c20c53cf29c9084.tar.xz
linux-7c69eb84d98a28c428f902318c20c53cf29c9084.zip
zonefs: fix IOCB_NOWAIT handling
IOCB_NOWAIT can't just be ignored as it breaks applications expecting it not to block. Just refuse the operation as applications must handle that (e.g. by falling back to a thread pool). Fixes: 8dcc1a9d90c1 ("fs: New zonefs file system") Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Diffstat (limited to 'fs/zonefs')
-rw-r--r--fs/zonefs/super.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 8bc6ef82d693..69aee3dfb660 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -601,13 +601,13 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret;
/*
- * For async direct IOs to sequential zone files, ignore IOCB_NOWAIT
+ * For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
* as this can cause write reordering (e.g. the first aio gets EAGAIN
* on the inode lock but the second goes through but is now unaligned).
*/
- if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !is_sync_kiocb(iocb)
- && (iocb->ki_flags & IOCB_NOWAIT))
- iocb->ki_flags &= ~IOCB_NOWAIT;
+ if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !is_sync_kiocb(iocb) &&
+ (iocb->ki_flags & IOCB_NOWAIT))
+ return -EOPNOTSUPP;
if (iocb->ki_flags & IOCB_NOWAIT) {
if (!inode_trylock(inode))