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-rw-r--r--fs/9p/xattr.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
new file mode 100644
index 0000000000..3c4572ef3a
--- /dev/null
+++ b/fs/9p/xattr.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/uio.h>
+#include <linux/posix_acl_xattr.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
+
+#include "fid.h"
+#include "xattr.h"
+
+ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
+ void *buffer, size_t buffer_size)
+{
+ ssize_t retval;
+ u64 attr_size;
+ struct p9_fid *attr_fid;
+ struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
+ struct iov_iter to;
+ int err;
+
+ iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buffer_size);
+
+ attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
+ if (IS_ERR(attr_fid)) {
+ retval = PTR_ERR(attr_fid);
+ p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
+ retval);
+ return retval;
+ }
+ if (attr_size > buffer_size) {
+ if (buffer_size)
+ retval = -ERANGE;
+ else if (attr_size > SSIZE_MAX)
+ retval = -EOVERFLOW;
+ else /* request to get the attr_size */
+ retval = attr_size;
+ } else {
+ iov_iter_truncate(&to, attr_size);
+ retval = p9_client_read(attr_fid, 0, &to, &err);
+ if (err)
+ retval = err;
+ }
+ p9_fid_put(attr_fid);
+ return retval;
+}
+
+
+/*
+ * v9fs_xattr_get()
+ *
+ * Copy an extended attribute into the buffer
+ * provided, or compute the buffer size required.
+ * Buffer is NULL to compute the size of the buffer required.
+ *
+ * Returns a negative error number on failure, or the number of bytes
+ * used / required on success.
+ */
+ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
+ void *buffer, size_t buffer_size)
+{
+ struct p9_fid *fid;
+ int ret;
+
+ p9_debug(P9_DEBUG_VFS, "name = '%s' value_len = %zu\n",
+ name, buffer_size);
+ fid = v9fs_fid_lookup(dentry);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+ ret = v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
+ p9_fid_put(fid);
+
+ return ret;
+}
+
+/*
+ * v9fs_xattr_set()
+ *
+ * Create, replace or remove an extended attribute for this inode. Buffer
+ * is NULL to remove an existing extended attribute, and non-NULL to
+ * either replace an existing extended attribute, or create a new extended
+ * attribute. The flags XATTR_REPLACE and XATTR_CREATE
+ * specify that an extended attribute must exist and must not exist
+ * previous to the call, respectively.
+ *
+ * Returns 0, or a negative error number on failure.
+ */
+int v9fs_xattr_set(struct dentry *dentry, const char *name,
+ const void *value, size_t value_len, int flags)
+{
+ int ret;
+ struct p9_fid *fid;
+
+ fid = v9fs_fid_lookup(dentry);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+ ret = v9fs_fid_xattr_set(fid, name, value, value_len, flags);
+ p9_fid_put(fid);
+ return ret;
+}
+
+int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
+ const void *value, size_t value_len, int flags)
+{
+ struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
+ struct iov_iter from;
+ int retval, err;
+
+ iov_iter_kvec(&from, ITER_SOURCE, &kvec, 1, value_len);
+
+ p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
+ name, value_len, flags);
+
+ /* Clone it */
+ fid = clone_fid(fid);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+
+ /*
+ * On success fid points to xattr
+ */
+ retval = p9_client_xattrcreate(fid, name, value_len, flags);
+ if (retval < 0)
+ p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
+ retval);
+ else
+ p9_client_write(fid, 0, &from, &retval);
+ err = p9_fid_put(fid);
+ if (!retval && err)
+ retval = err;
+ return retval;
+}
+
+ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
+{
+ /* Txattrwalk with an empty string lists xattrs instead */
+ return v9fs_xattr_get(dentry, "", buffer, buffer_size);
+}
+
+static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *inode,
+ const char *name, void *buffer, size_t size)
+{
+ const char *full_name = xattr_full_name(handler, name);
+
+ return v9fs_xattr_get(dentry, full_name, buffer, size);
+}
+
+static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
+ struct mnt_idmap *idmap,
+ struct dentry *dentry, struct inode *inode,
+ const char *name, const void *value,
+ size_t size, int flags)
+{
+ const char *full_name = xattr_full_name(handler, name);
+
+ return v9fs_xattr_set(dentry, full_name, value, size, flags);
+}
+
+static struct xattr_handler v9fs_xattr_user_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .get = v9fs_xattr_handler_get,
+ .set = v9fs_xattr_handler_set,
+};
+
+static struct xattr_handler v9fs_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .get = v9fs_xattr_handler_get,
+ .set = v9fs_xattr_handler_set,
+};
+
+#ifdef CONFIG_9P_FS_SECURITY
+static struct xattr_handler v9fs_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .get = v9fs_xattr_handler_get,
+ .set = v9fs_xattr_handler_set,
+};
+#endif
+
+const struct xattr_handler *v9fs_xattr_handlers[] = {
+ &v9fs_xattr_user_handler,
+ &v9fs_xattr_trusted_handler,
+#ifdef CONFIG_9P_FS_SECURITY
+ &v9fs_xattr_security_handler,
+#endif
+ NULL
+};