[RFC 1/7] iomap: Don't fall back to bufferred write if the write is atomic

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Currently, iomap only supports atomic writes for direct IOs and there is
no guarantees that a bufferred IO will be atomic. Hence, if the user has
explicitly requested the direct write to be atomic and there's a
failure, return -EIO instead of falling back to bufferred IO.

Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
---
 fs/iomap/direct-io.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 6ef25e26f1a1..d7e6c6eacbf7 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -662,7 +662,13 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
 			if (ret != -EAGAIN) {
 				trace_iomap_dio_invalidate_fail(inode, iomi.pos,
 								iomi.len);
-				ret = -ENOTBLK;
+				/*
+				 * if this write was supposed to be atomic,
+				 * return the err rather than trying to fall
+				 * back to bufferred IO.
+				 */
+				if (!atomic_write)
+					ret = -ENOTBLK;
 			}
 			goto out_free_dio;
 		}
-- 
2.39.3





[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux