[PATCH] cifs: fix missing fscache_resize_cookie() calls in size-changing paths

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

  - 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

Add the missing fscache_resize_cookie() calls immediately after
cifs_setsize() in each of these paths, consistent with the pattern
used in the existing smb3_zero_range() and smb3_collapse_range() paths.

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]>
---
 fs/smb/client/file.c    | 1 +
 fs/smb/client/smb2ops.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index ac89c1ba56b1..e329d1d87ec6 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -1016,6 +1016,7 @@ static int cifs_do_truncate(const unsigned int xid, struct dentry *dentry)
 		if (!rc) {
 			netfs_resize_file(&cinode->netfs, 0, true);
 			cifs_setsize(inode, 0);
+			fscache_resize_cookie(cifs_inode_cookie(inode), 0);
 		}
 	}
 	if (cfile)
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index cbd51a08e97e..bee51f776cd8 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2224,6 +2224,7 @@ smb2_duplicate_extents(const unsigned int xid,
 			goto duplicate_extents_out;
 		netfs_resize_file(netfs_inode(inode), dest_off + len, true);
 		cifs_setsize(inode, dest_off + len);
+		fscache_resize_cookie(cifs_inode_cookie(inode), dest_off + len);
 	}
 	rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 			trgtfile->fid.volatile_fid,
@@ -3778,6 +3779,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 			new_eof = off + len;
 			netfs_resize_file(&cifsi->netfs, new_eof, true);
 			cifs_setsize(inode, new_eof);
+			fscache_resize_cookie(cifs_inode_cookie(inode), new_eof);
 
 			qrc = SMB2_query_info(xid, tcon,
 					      cfile->fid.persistent_fid,
@@ -3827,6 +3829,7 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
 
 		netfs_resize_file(&cifsi->netfs, new_eof, true);
 		cifs_setsize(inode, new_eof);
+		fscache_resize_cookie(cifs_inode_cookie(inode), new_eof);
 
 		qrc = SMB2_query_info(xid, tcon,
 				      cfile->fid.persistent_fid,
-- 
2.55.0