/* * Copyright (C) 2007 Red Hat. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * 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., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/init.h> #include <linux/fs.h> #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" #include "xattr.h" #include "disk-io.h" ssize_t __btrfs_getxattr(struct inode *inode, const char *name, void *buffer, size_t size) { struct btrfs_dir_item *di; struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_path *path; struct extent_buffer *leaf; int ret = 0; unsigned long data_ptr; path = btrfs_alloc_path(); if (!path) return -ENOMEM; /* lookup the xattr by name */ di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name, strlen(name), 0); if (!di) { ret = -ENODATA; goto out; } else if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } leaf = path->nodes[0]; /* if size is 0, that means we want the size of the attr */ if (!size) { ret = btrfs_dir_data_len(leaf, di); goto out; } /* now get the data out of our dir_item */ if (btrfs_dir_data_len(leaf, di) > size) { 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, btrfs_dir_data_len(leaf, di)); ret = btrfs_dir_data_len(leaf, di); out: btrfs_free_path(path); return ret; } 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_path *path; 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; /* first lets see if we already have this xattr */ di = btrfs_lookup_xattr(trans, root, path, inode->i_ino, name, strlen(name), -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } /* ok we already have this xattr, lets remove it */ if (di) { /* if we want create only exit */ if (flags & XATTR_CREATE) { ret = -EEXIST; goto out; } ret = btrfs_delete_one_dir_name(trans, root, path, di); BUG_ON(ret); btrfs_release_path(root, path); /* if we don't have a value then we are removing the xattr */ if (!value) goto out; } else { btrfs_release_path(root, path); if (flags & XATTR_REPLACE) { /* we couldn't find the attr to replace */ ret = -ENODATA; goto out; } } /* ok we have to create a completely new xattr */ 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) return ret; trans = btrfs_start_transaction(root, 1); if (!trans) { ret = -ENOMEM; goto out; } btrfs_set_trans_block_group(trans, inode); 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; } ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size) { struct btrfs_key key, found_key; struct inode *inode = dentry->d_inode; struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_path *path; struct btrfs_item *item; struct extent_buffer *leaf; struct btrfs_dir_item *di; int ret = 0, slot, advance; size_t total_size = 0, size_left = size; unsigned long name_ptr; size_t name_len; u32 nritems; /* * ok we want all objects associated with this id. * NOTE: we set key.offset = 0; because we want to start with the * first xattr that we find and walk forward */ key.objectid = inode->i_ino; btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); key.offset = 0; path = btrfs_alloc_path(); if (!path) return -ENOMEM; path->reada = 2; /* search for our xattrs */ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto err; advance = 0; while (1) { leaf = path->nodes[0]; nritems = btrfs_header_nritems(leaf); slot = path->slots[0]; /* this is where we start walking through the path */ if (advance || slot >= nritems) { /* * if we've reached the last slot in this leaf we need * to go to the next leaf and reset everything */ if (slot >= nritems-1) { ret = btrfs_next_leaf(root, path); if (ret) break; leaf = path->nodes[0]; nritems = btrfs_header_nritems(leaf); slot = path->slots[0]; } else { /* * just walking through the slots on this leaf */ slot++; path->slots[0]++; } } advance = 1; item = btrfs_item_nr(leaf, slot); btrfs_item_key_to_cpu(leaf, &found_key, slot); /* check to make sure this item is what we want */ if (found_key.objectid != key.objectid) break; if (btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY) break; di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); name_len = btrfs_dir_name_len(leaf, di); total_size += name_len + 1; /* we are just looking for how big our buffer needs to be */ if (!size) continue; if (!buffer || (name_len + 1) > size_left) { ret = -ERANGE; goto err; } name_ptr = (unsigned long)(di + 1); read_extent_buffer(leaf, buffer, name_ptr, name_len); buffer[name_len] = '\0'; size_left -= name_len + 1; buffer += name_len + 1; } ret = total_size; err: btrfs_free_path(path); return ret; } /* * List of handlers for synthetic system.* attributes. All real ondisk * attributes are handled directly. */ struct xattr_handler *btrfs_xattr_handlers[] = { #ifdef CONFIG_BTRFS_FS_POSIX_ACL &btrfs_xattr_acl_access_handler, &btrfs_xattr_acl_default_handler, #endif NULL, }; /* * Check if the attribute is in a supported namespace. * * This applied after the check for the synthetic attributes in the system * namespace. */ static bool btrfs_is_valid_xattr(const char *name) { return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) || !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); } ssize_t btrfs_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size) { /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_getxattr(dentry, name, buffer, size); if (!btrfs_is_valid_xattr(name)) return -EOPNOTSUPP; return __btrfs_getxattr(dentry->d_inode, name, buffer, size); } int btrfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_setxattr(dentry, name, value, size, flags); if (!btrfs_is_valid_xattr(name)) return -EOPNOTSUPP; if (size == 0) value = ""; /* empty EA, do not remove */ return __btrfs_setxattr(NULL, dentry->d_inode, name, value, size, flags); } int btrfs_removexattr(struct dentry *dentry, const char *name) { /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_removexattr(dentry, name); if (!btrfs_is_valid_xattr(name)) return -EOPNOTSUPP; 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; }