From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [RFC][PATCH 09/15] nilfs2: implement listxattr and getxattr functionality
This patch adds functionality listxattr and getxattr operations.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/xafile.c | 167 ++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/xafile.h | 20 +++++++
fs/nilfs2/xattr.c | 64 ++++++++++++++++++++
fs/nilfs2/xattr.h | 44 ++++++++++++++
4 files changed, 295 insertions(+)
create mode 100644 fs/nilfs2/xattr.c
create mode 100644 fs/nilfs2/xattr.h
diff --git a/fs/nilfs2/xafile.c b/fs/nilfs2/xafile.c
index 6511da7..e89e95b 100644
--- a/fs/nilfs2/xafile.c
+++ b/fs/nilfs2/xafile.c
@@ -220,6 +220,19 @@ struct nilfs_xattr_search {
(!IS_SEARCH_KEY_EMPTY(data) && \
IS_SEARCH_RESULT_EMPTY(data))
+/* Map of xattr handlers */
+static const struct xattr_handler *nilfs_xattr_handler_map[] = {
+ [NILFS_USER_XATTR_ID] = &nilfs_xattr_user_handler,
+#ifdef CONFIG_NILFS2_FS_POSIX_ACL
+ [NILFS_POSIX_ACL_ACCESS_XATTR_ID] = &nilfs_xattr_acl_access_handler,
+ [NILFS_POSIX_ACL_DEFAULT_XATTR_ID] = &nilfs_xattr_acl_default_handler,
+#endif
+ [NILFS_TRUSTED_XATTR_ID] = &nilfs_xattr_trusted_handler,
+#ifdef CONFIG_NILFS2_FS_SECURITY
+ [NILFS_SECURITY_XATTR_ID] = &nilfs_xattr_security_handler,
+#endif
+};
+
/*
* NILFS_XAFILE_I - convert inode info into xafile inode info
*/
@@ -230,6 +243,19 @@ struct nilfs_xafile_info *NILFS_XAFILE_I(struct inode *xafile)
}
/*
+ * nilfs_xattr_handler - get xattr handler by name index
+ */
+static inline
+const struct xattr_handler *nilfs_xattr_handler(int name_index)
+{
+ const struct xattr_handler *handler = NULL;
+
+ if (name_index > 0 && name_index < ARRAY_SIZE(nilfs_xattr_handler_map))
+ handler = nilfs_xattr_handler_map[name_index];
+ return handler;
+}
+
+/*
* nilfs_xafile_get_node - get xafile node
* @xafile: xafile inode
* @node_id: node number
@@ -1300,3 +1326,144 @@ void nilfs_xafile_abort_new_node(struct inode *inode,
nilfs_xafile_abort_node_creation(xafile, &data->node.req);
nilfs_xafile_abort_node_change(data);
}
+
+/*
+ * nilfs_xattr_list_entries - list inode's xattrs from one xanode
+ * @dentry: dentry object
+ * @bh: xanode's buffer
+ * @buf: buffer for getting xattrs' list [out]
+ * @size: buffer size
+ */
+static
+int nilfs_xattr_list_entries(struct dentry *dentry, struct buffer_head *bh,
+ char *buf, size_t buf_size)
+{
+ union nilfs_xanode_header *hdr = NILFS_XANODE_HDR(BH_DATA(bh));
+ union nilfs_xattr_key *key;
+ size_t rest = buf_size;
+
+ key = NILFS_XANODE_FIRST_NOT_INDEX_KEY(hdr);
+
+ for (; !IS_END_KEY(key); key = NEXT_KEY(key, 1)) {
+ u8 name_index = NILFS_XANODE_NAME_HASH(key)->name_index;
+ const struct nilfs_xanode_entry *entry =
+ NILFS_XANODE_ENTRY(key, BH_DATA(bh));
+ const struct xattr_handler *handler =
+ nilfs_xattr_handler(name_index);
+ __u8 name_len = NILFS_XANODE_NAME_HASH(key)->name_len;
+
+ if (handler) {
+ size_t size = handler->list(dentry, buf, rest,
+ entry->name, name_len,
+ handler->flags);
+ if (buf) {
+ if (size > rest)
+ return -ERANGE;
+ buf += size;
+ }
+ rest -= size;
+ }
+ }
+
+ return buf_size - rest;
+}
+
+/*
+ * nilfs_xafile_listxattr - list all inode's xattrs
+ * @dentry: dentry object
+ * @buffer: buffer for getting xattrs' list [out]
+ * @size: buffer size
+ */
+ssize_t nilfs_xafile_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+ ssize_t ret = 0, err = 0;
+ struct inode *inode = dentry->d_inode;
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct buffer_head *bh = NULL;
+ __u64 node = NILFS_I(inode)->i_xattr;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (node == NILFS_INVALID_XANODE)
+ return 0;
+
+ err = nilfs_xafile_get_checked_node(inode, node, &bh);
+ if (unlikely(err))
+ goto failed_xafile_listxattr;
+
+ err = nilfs_xattr_list_entries(dentry, bh, buffer, size);
+ if (unlikely(err < 0))
+ goto cleanup_after_failure;
+ else
+ ret += err;
+
+ brelse(bh);
+ return ret;
+
+cleanup_after_failure:
+ brelse(bh);
+
+failed_xafile_listxattr:
+ return err;
+}
+
+/*
+ * nilfs_xafile_getxattr - get xattr
+ * @inode: inode pointer
+ * @name: xattr's name
+ * @value: buffer for xattr's value [out]
+ * @size: buffer size
+ */
+ssize_t nilfs_xafile_getxattr(struct inode *inode,
+ int name_index, const char *name,
+ void *value, size_t size)
+{
+ ssize_t ret, err;
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+ struct nilfs_xattr_search data;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (NILFS_I(inode)->i_xattr == NILFS_INVALID_XANODE)
+ return -ENODATA;
+
+ err = nilfs_xattr_search_init(inode, name_index, (char *)name, &data);
+ if (unlikely(err))
+ return err;
+
+ err = nilfs_xafile_find_node(inode, &data);
+ if (unlikely(err)) {
+ ret = err;
+ goto failed_xafile_getxattr;
+ }
+
+ if (!data.result.found) {
+ ret = -ENODATA;
+ goto cleanup_after_failure;
+ }
+
+ ret = NILFS_XANODE_ENTRY_SIZE(data.result.key) -
+ NILFS_XANODE_NAME_HASH(data.result.key)->name_len;
+
+ if (value) {
+ char *xattr_value;
+
+ if (ret > size) {
+ ret = -ERANGE;
+ goto cleanup_after_failure;
+ }
+
+ xattr_value = NILFS_XATTR_VALUE(data.result.entry,
+ data.result.key);
+ memcpy(value, xattr_value, ret);
+ }
+
+cleanup_after_failure:
+ brelse(NODE_BH(&data.node));
+
+failed_xafile_getxattr:
+ nilfs_xattr_search_release(&data);
+ return ret;
+}
diff --git a/fs/nilfs2/xafile.h b/fs/nilfs2/xafile.h
index 846ea3a..50c4735 100644
--- a/fs/nilfs2/xafile.h
+++ b/fs/nilfs2/xafile.h
@@ -29,6 +29,20 @@
/* Magic number of xafile node */
#define NILFS_XANODE_MAGIC 0x5841 /* XA */
+/* Name indexes */
+#define NILFS_USER_XATTR_ID 1
+#define NILFS_POSIX_ACL_ACCESS_XATTR_ID 2
+#define NILFS_POSIX_ACL_DEFAULT_XATTR_ID 3
+#define NILFS_TRUSTED_XATTR_ID 4
+#define NILFS_SECURITY_XATTR_ID 5
+#define NILFS_SYSTEM_XATTR_ID 6
+#define NILFS_RICHACL_XATTR_ID 7
+#define NILFS_XATTR_MAX_ID 255
+
+#define IS_NAME_ID_VALID(name_index) \
+ (name_index < NILFS_USER_XATTR_ID || \
+ name_index > NILFS_RICHACL_XATTR_ID)
+
/* Xanode types */
#define NILFS_UNKNOWN_XANODE_TYPE 0
/* Temporary, numbers from 1 till 6 are simply reserved */
@@ -417,6 +431,12 @@ NILFS_XANODE_LAST_ENTRY(union nilfs_xanode_header *hdr)
#define NILFS_XATTR_VALUE(entry, key) \
((char *)(entry) + NILFS_XANODE_NAME_HASH(key)->name_len)
+extern const struct xattr_handler nilfs_xattr_user_handler;
+extern const struct xattr_handler nilfs_xattr_trusted_handler;
+extern const struct xattr_handler nilfs_xattr_acl_access_handler;
+extern const struct xattr_handler nilfs_xattr_acl_default_handler;
+extern const struct xattr_handler nilfs_xattr_security_handler;
+
/* Xafile API */
ssize_t nilfs_xafile_listxattr(struct dentry *dentry, char *buf, size_t size);
ssize_t nilfs_xafile_getxattr(struct inode *inode,
diff --git a/fs/nilfs2/xattr.c b/fs/nilfs2/xattr.c
new file mode 100644
index 0000000..7be523a
--- /dev/null
+++ b/fs/nilfs2/xattr.c
@@ -0,0 +1,64 @@
+/*
+ * xattr.c - NILFS extended attributes support implementation.
+ *
+ * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2013 Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ */
+
+#include "nilfs.h"
+#include "xafile.h"
+#include "xattr.h"
+
+const struct xattr_handler *nilfs_xattr_handlers[] = {
+ &nilfs_xattr_user_handler,
+ &nilfs_xattr_trusted_handler,
+#ifdef CONFIG_NILFS2_FS_POSIX_ACL
+ &nilfs_xattr_acl_access_handler,
+ &nilfs_xattr_acl_default_handler,
+#endif
+#ifdef CONFIG_NILFS2_FS_SECURITY
+ &nilfs_xattr_security_handler,
+#endif
+ NULL
+};
+
+ssize_t nilfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+ ssize_t ret;
+ struct inode *inode = dentry->d_inode;
+
+ down_read(&NILFS_I(inode)->xattr_sem);
+ ret = nilfs_xafile_listxattr(dentry, buffer, size);
+ up_read(&NILFS_I(inode)->xattr_sem);
+
+ return ret;
+}
+
+ssize_t __nilfs_getxattr(struct inode *inode,
+ int name_index, const char *name,
+ void *value, size_t size)
+{
+ ssize_t ret;
+
+ down_read(&NILFS_I(inode)->xattr_sem);
+ ret = nilfs_xafile_getxattr(inode, name_index, name, value, size);
+ up_read(&NILFS_I(inode)->xattr_sem);
+
+ return ret;
+}
diff --git a/fs/nilfs2/xattr.h b/fs/nilfs2/xattr.h
new file mode 100644
index 0000000..0736086
--- /dev/null
+++ b/fs/nilfs2/xattr.h
@@ -0,0 +1,44 @@
+/*
+ * xattr.h - NILFS extended attributes declarations.
+ *
+ * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2013 Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ */
+
+#ifndef _NILFS_XATTR_H
+#define _NILFS_XATTR_H
+
+#include <linux/xattr.h>
+
+extern const struct xattr_handler *nilfs_xattr_handlers[];
+
+ssize_t __nilfs_getxattr(struct inode *inode,
+ int name_index, const char *name,
+ void *value, size_t size);
+
+static inline ssize_t nilfs_getxattr(struct dentry *dentry,
+ int name_index, const char *name,
+ void *value, size_t size)
+{
+ return __nilfs_getxattr(dentry->d_inode, name_index, name, value, size);
+}
+
+ssize_t nilfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
+
+#endif /* _NILFS_XATTR_H */
--
1.7.9.5
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