#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/xattr.h>
+#include <linux/security.h>
#include "ctree.h"
#include "btrfs_inode.h"
#include "transaction.h"
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
strlen(name), 0);
- if (!di || IS_ERR(di)) {
+ if (!di) {
ret = -ENODATA;
goto out;
+ } else if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out;
}
leaf = path->nodes[0];
ret = -ERANGE;
goto out;
}
+
+ /*
+ * The way things are packed into the leaf is like this
+ * |struct btrfs_dir_item|name|data|
+ * where name is the xattr name, so security.foo, and data is the
+ * content of the xattr. data_ptr points to the location in memory
+ * where the data starts in the in memory leaf
+ */
data_ptr = (unsigned long)((char *)(di + 1) +
btrfs_dir_name_len(leaf, di));
read_extent_buffer(leaf, buffer, data_ptr,
return ret;
}
-int __btrfs_setxattr(struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
+static int do_setxattr(struct btrfs_trans_handle *trans,
+ struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans;
struct btrfs_path *path;
- int ret = 0, mod = 0;
+ size_t name_len = strlen(name);
+ int ret = 0;
+
+ if (name_len + size > BTRFS_MAX_XATTR_SIZE(root))
+ return -ENOSPC;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
/* first lets see if we already have this xattr */
di = btrfs_lookup_xattr(trans, root, path, inode->i_ino, name,
strlen(name), -1);
}
ret = btrfs_delete_one_dir_name(trans, root, path, di);
- if (ret)
- goto out;
+ BUG_ON(ret);
btrfs_release_path(root, path);
/* if we don't have a value then we are removing the xattr */
- if (!value) {
- mod = 1;
+ if (!value)
goto out;
- }
} else {
btrfs_release_path(root, path);
}
/* ok we have to create a completely new xattr */
- ret = btrfs_insert_xattr_item(trans, root, name, strlen(name),
- value, size, inode->i_ino);
+ ret = btrfs_insert_xattr_item(trans, root, path, inode->i_ino,
+ name, name_len, value, size);
+ BUG_ON(ret);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int __btrfs_setxattr(struct btrfs_trans_handle *trans,
+ struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+
+ if (trans)
+ return do_setxattr(trans, inode, name, value, size, flags);
+
+ ret = btrfs_reserve_metadata_space(root, 2);
if (ret)
- goto out;
- mod = 1;
+ return ret;
-out:
- if (mod) {
- inode->i_ctime = CURRENT_TIME;
- ret = btrfs_update_inode(trans, root, inode);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ ret = -ENOMEM;
+ goto out;
}
+ btrfs_set_trans_block_group(trans, inode);
- btrfs_end_transaction(trans, root);
- btrfs_free_path(path);
+ ret = do_setxattr(trans, inode, name, value, size, flags);
+ if (ret)
+ goto out;
+
+ inode->i_ctime = CURRENT_TIME;
+ ret = btrfs_update_inode(trans, root, inode);
+ BUG_ON(ret);
+out:
+ btrfs_end_transaction_throttle(trans, root);
+ btrfs_unreserve_metadata_space(root, 2);
return ret;
}
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto err;
- ret = 0;
advance = 0;
while (1) {
leaf = path->nodes[0];
* attributes are handled directly.
*/
struct xattr_handler *btrfs_xattr_handlers[] = {
-#ifdef CONFIG_FS_POSIX_ACL
+#ifdef CONFIG_BTRFS_FS_POSIX_ACL
&btrfs_xattr_acl_access_handler,
&btrfs_xattr_acl_default_handler,
#endif
if (size == 0)
value = ""; /* empty EA, do not remove */
- return __btrfs_setxattr(dentry->d_inode, name, value, size, flags);
+
+ return __btrfs_setxattr(NULL, dentry->d_inode, name, value, size,
+ flags);
}
int btrfs_removexattr(struct dentry *dentry, const char *name)
if (!btrfs_is_valid_xattr(name))
return -EOPNOTSUPP;
- return __btrfs_setxattr(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
+
+ return __btrfs_setxattr(NULL, dentry->d_inode, name, NULL, 0,
+ XATTR_REPLACE);
+}
+
+int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
+ struct inode *inode, struct inode *dir)
+{
+ int err;
+ size_t len;
+ void *value;
+ char *suffix;
+ char *name;
+
+ err = security_inode_init_security(inode, dir, &suffix, &value, &len);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ name = kmalloc(XATTR_SECURITY_PREFIX_LEN + strlen(suffix) + 1,
+ GFP_NOFS);
+ if (!name) {
+ err = -ENOMEM;
+ } else {
+ strcpy(name, XATTR_SECURITY_PREFIX);
+ strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
+ err = __btrfs_setxattr(trans, inode, name, value, len, 0);
+ kfree(name);
+ }
+
+ kfree(suffix);
+ kfree(value);
+ return err;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff