[PATCH v2] cifs: add fscache_resize_cookie() to cifs_setsize()

Several code paths update the VFS inode size by calling
netfs_resize_file() and cifs_setsize(), but omit the corresponding
fscache_resize_cookie() call, leaving the fscache cookie out of sync
with the actual file size:

  - cifs_file_set_size() in inode.c: server-side truncation via setattr
  - cifs_do_truncate() in file.c: truncates to zero on O_TRUNC open
  - smb2_duplicate_extents() in smb2ops.c: file clone extending EOF
  - smb3_simple_falloc() in smb2ops.c: two branches that extend EOF
    via write-range and SMB2_set_eof respectively

Since every caller of cifs_setsize() must resize the fscache cookie,
add the call to cifs_setsize() itself, consistent with how
truncate_pagecache() is already consolidated there.

Fixes: 70431bfd825d ("cifs: Support fscache indexing rewrite")
Fixes: 93a43155127f ("cifs: Fix missing set of remote_i_size")
Fixes: 110fee6b9bb5 ("smb: client: fix missing timestamp updates with O_TRUNC")
Fixes: 7a06d3b816d7 ("smb/client: emulate small EOF-extending mode 0 fallocate ranges")
Cc: [email protected]
Cc: David Howells <[email protected]>
Cc: Paulo Alcantara <[email protected]>
Cc: Huiwen He <[email protected]>
Signed-off-by: Frank Sorenson <[email protected]>
Reviewed-by: Paulo Alcantara <[email protected]>
---
 fs/smb/client/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index 808085eb0cdc..0afff761aab9 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -3059,6 +3059,7 @@ void cifs_setsize(struct inode *inode, loff_t offset)
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 	truncate_pagecache(inode, offset);
 	netfs_wait_for_outstanding_io(inode);
+	fscache_resize_cookie(cifs_inode_cookie(inode), offset);
 }
 
 int cifs_file_set_size(const unsigned int xid, struct dentry *dentry,
-- 
2.55.0