Add way to query file attributes via cifs xattr
Add parsing for new pseudo-xattr user.cifs.dosattrib file attribute
so tools can recognize what kind of file it is, and verify if common
SMB3 attributes (system, hidden, archive, sparse, indexed etc.) are
set.
Signed-off-by: Steve French <steve.french@primarydata.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 5e23f64..c4237b8 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -33,6 +33,7 @@
#define MAX_EA_VALUE_SIZE 65535
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
+#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
/* BB need to add server (Samba e.g) support for security and trusted prefix */
@@ -144,6 +145,31 @@
return rc;
}
+static int cifs_attrib_get(struct dentry *dentry,
+ struct inode *inode, void *value,
+ size_t size)
+{
+ ssize_t rc;
+ __u32 *pattribute;
+
+ rc = cifs_revalidate_dentry_attr(dentry);
+
+ if (rc)
+ return rc;
+
+ if ((value == NULL) || (size == 0))
+ return sizeof(__u32);
+ else if (size < sizeof(__u32))
+ return -ERANGE;
+
+ /* return dos attributes as pseudo xattr */
+ pattribute = (__u32 *)value;
+ *pattribute = CIFS_I(inode)->cifsAttrs;
+
+ return sizeof(__u32);
+}
+
+
static int cifs_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
@@ -168,10 +194,16 @@
rc = -ENOMEM;
goto out;
}
- /* return dos attributes as pseudo xattr */
+
/* return alt name if available as pseudo attr */
switch (handler->flags) {
case XATTR_USER:
+ cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
+ if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
+ rc = cifs_attrib_get(dentry, inode, value, size);
+ break;
+ }
+
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
goto out;