From: Jeff Layton Date: Fri, 15 Oct 2010 19:34:07 +0000 (-0400) Subject: cifs: wait for writeback to complete in cifs_flush X-Git-Tag: firefly_0821_release~7613^2~3562^2~11 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d3f1322af8f866be54ea79a4002fc30c98290411;p=firefly-linux-kernel-4.4.55.git 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 Reviewed-by: Suresh Jayaraman Reviewed-by: David Kleikamp Signed-off-by: Steve French --- diff --git a/fs/cifs/file.c b/fs/cifs/file.c index baf4b5067ff9..128e07b85d6c 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -1688,20 +1688,13 @@ int cifs_flush(struct file *file, fl_owner_t id) 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);