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cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC

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cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it
cannot use cifs_resize_file_locked() to perform a proper fscache cookie
resize.  Instead, add cifs_invalidate_cache() after cifs_setsize().

cifs_invalidate_cache() calls fscache_invalidate(), which works without
holding i_rwsem: it unconditionally increments inval_counter and sets
FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not
served once the cookie is later activated by fscache_use_cookie().
Truncation to zero leaves no valid cached data, making invalidation the
correct semantic here.

Fixes: fa724e235c ("cifs: add fscache_resize_cookie() to cifs_setsize()")
Cc: stable@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
Cc: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
This commit is contained in:
Frank Sorenson 2026-07-31 12:12:28 -05:00 committed by Paulo Alcantara
parent b1b741cf8e
commit 364b183230
1 changed files with 1 additions and 0 deletions
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fs/smb/client/file.c
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@ -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);
cifs_invalidate_cache(inode, 0);
}
}
if (cfile)