cifs: wait for writeback to complete in cifs_flush
The f_op->flush operation is the last chance to return a writeback
related error when closing a file. Ensure that we don't miss reporting
any errors by waiting for writeback to complete in cifs_flush before
proceeding.
There's no reason to do this when the file isn't open for write
however.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Reviewed-by: David Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index baf4b506..128e07b 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1688,20 +1688,13 @@
struct inode *inode = file->f_path.dentry->d_inode;
int rc = 0;
- /* Rather than do the steps manually:
- lock the inode for writing
- loop through pages looking for write behind data (dirty pages)
- coalesce into contiguous 16K (or smaller) chunks to write to server
- send to server (prefer in parallel)
- deal with writebehind errors
- unlock inode for writing
- filemapfdatawrite appears easier for the time being */
-
- rc = filemap_fdatawrite(inode->i_mapping);
- /* reset wb rc if we were able to write out dirty pages */
- if (!rc) {
- rc = CIFS_I(inode)->write_behind_rc;
- CIFS_I(inode)->write_behind_rc = 0;
+ if (file->f_mode & FMODE_WRITE) {
+ rc = filemap_write_and_wait(inode->i_mapping);
+ /* reset wb rc if we were able to write out dirty pages */
+ if (!rc) {
+ rc = CIFS_I(inode)->write_behind_rc;
+ CIFS_I(inode)->write_behind_rc = 0;
+ }
}
cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);