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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>
This commit is contained in:
Jeff Layton 2010-10-15 15:34:07 -04:00 committed by Steve French
parent 5f6dbc9e4a
commit d3f1322af8
1 changed files with 7 additions and 14 deletions
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21
fs/cifs/file.c
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@ -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);