FAILED: patch "[PATCH] cifs: add fscache_resize_cookie() to cifs_setsize()" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x fa724e235cfdb0fb0bb427d0f9dfe864ae27403e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026080559-manatee-serpent-797c@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fa724e235cfdb0fb0bb427d0f9dfe864ae27403e Mon Sep 17 00:00:00 2001
From: Frank Sorenson <[email protected]>
Date: Sat, 25 Jul 2026 21:04:44 +0000
Subject: [PATCH] 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]>
Signed-off-by: Steve French <[email protected]>

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,