[PATCH 6.12.y 3/3] cifs: add fscache_resize_cookie() to cifs_setsize()

From: Frank Sorenson <[email protected]>

[ Upstream commit fa724e235cfdb0fb0bb427d0f9dfe864ae27403e ]

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]>
Signed-off-by: Steve French <[email protected]>
Signed-off-by: Sasha Levin <[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 453a5df20f8cc..b67b316538b83 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -2966,6 +2966,7 @@ void cifs_setsize(struct inode *inode, loff_t offset)
 	cifs_i->time = 0;
 	truncate_pagecache(inode, offset);
 	netfs_wait_for_outstanding_io(inode);
+	fscache_resize_cookie(cifs_inode_cookie(inode), offset);
 }
 
 static int
-- 
2.53.0