Add way to query file attributes via cifs xattr (a958fff2) · Commits · 戴 / test

fs/cifs/xattr.c

+33 −1

Original line number	Diff line number	Diff line
		@@ -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 @@ out:
		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 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
		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;