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, btrfs_ino(inode), 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(path); /* if we don't have a value then we are removing the xattr */ if (!value) goto out; } else { btrfs_release_path(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, btrfs_ino(inode), name, name_len, value, size); BUG_ON(ret); out: btrfs_free_path(path); return ret; }
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, btrfs_ino(inode), 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; }
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; /* */ di = btrfs_lookup_xattr(NULL, root, path, btrfs_ino(inode), 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) { ret = btrfs_dir_data_len(leaf, di); goto out; } /* */ if (btrfs_dir_data_len(leaf, di) > size) { ret = -ERANGE; goto out; } /* */ 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; if (flags & XATTR_REPLACE) { di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { ret = -ENODATA; goto out; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; btrfs_release_path(path); /* * remove the attribute */ if (!value) goto out; } again: ret = btrfs_insert_xattr_item(trans, root, path, btrfs_ino(inode), name, name_len, value, size); if (ret == -EEXIST) { if (flags & XATTR_CREATE) goto out; /* * We can't use the path we already have since we won't have the * proper locking for a delete, so release the path and * re-lookup to delete the thing. */ btrfs_release_path(path); di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { /* Shouldn't happen but just in case... */ btrfs_release_path(path); goto again; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; /* * We have a value to set, so go back and try to insert it now. */ if (value) { btrfs_release_path(path); goto again; } } 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 = NULL; 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; path->skip_release_on_error = 1; if (!value) { di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (!di && (flags & XATTR_REPLACE)) ret = -ENODATA; else if (IS_ERR(di)) ret = PTR_ERR(di); else if (di) ret = btrfs_delete_one_dir_name(trans, root, path, di); goto out; } /* * For a replace we can't just do the insert blindly. * Do a lookup first (read-only btrfs_search_slot), and return if xattr * doesn't exist. If it exists, fall down below to the insert/replace * path - we can't race with a concurrent xattr delete, because the VFS * locks the inode's i_mutex before calling setxattr or removexattr. */ if (flags & XATTR_REPLACE) { ASSERT(inode_is_locked(inode)); di = btrfs_lookup_xattr(NULL, root, path, btrfs_ino(inode), name, name_len, 0); if (!di) ret = -ENODATA; else if (IS_ERR(di)) ret = PTR_ERR(di); if (ret) goto out; btrfs_release_path(path); di = NULL; } ret = btrfs_insert_xattr_item(trans, root, path, btrfs_ino(inode), name, name_len, value, size); if (ret == -EOVERFLOW) { /* * We have an existing item in a leaf, split_leaf couldn't * expand it. That item might have or not a dir_item that * matches our target xattr, so lets check. */ ret = 0; btrfs_assert_tree_locked(path->nodes[0]); di = btrfs_match_dir_item_name(root, path, name, name_len); if (!di && !(flags & XATTR_REPLACE)) { ret = -ENOSPC; goto out; } } else if (ret == -EEXIST) { ret = 0; di = btrfs_match_dir_item_name(root, path, name, name_len); ASSERT(di); /* logic error */ } else if (ret) { goto out; } if (di && (flags & XATTR_CREATE)) { ret = -EEXIST; goto out; } if (di) { /* * We're doing a replace, and it must be atomic, that is, at * any point in time we have either the old or the new xattr * value in the tree. We don't want readers (getxattr and * listxattrs) to miss a value, this is specially important * for ACLs. */ const int slot = path->slots[0]; struct extent_buffer *leaf = path->nodes[0]; const u16 old_data_len = btrfs_dir_data_len(leaf, di); const u32 item_size = btrfs_item_size_nr(leaf, slot); const u32 data_size = sizeof(*di) + name_len + size; struct btrfs_item *item; unsigned long data_ptr; char *ptr; if (size > old_data_len) { if (btrfs_leaf_free_space(root, leaf) < (size - old_data_len)) { ret = -ENOSPC; goto out; } } if (old_data_len + name_len + sizeof(*di) == item_size) { /* No other xattrs packed in the same leaf item. */ if (size > old_data_len) btrfs_extend_item(root, path, size - old_data_len); else if (size < old_data_len) btrfs_truncate_item(root, path, data_size, 1); } else { /* There are other xattrs packed in the same item. */ ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; btrfs_extend_item(root, path, data_size); } item = btrfs_item_nr(slot); ptr = btrfs_item_ptr(leaf, slot, char); ptr += btrfs_item_size(leaf, item) - data_size; di = (struct btrfs_dir_item *)ptr; btrfs_set_dir_data_len(leaf, di, size); data_ptr = ((unsigned long)(di + 1)) + name_len; write_extent_buffer(leaf, value, data_ptr, size); btrfs_mark_buffer_dirty(leaf); } else { /* * Insert, and we had space for the xattr, so path->slots[0] is * where our xattr dir_item is and btrfs_insert_xattr_item() * filled it. */ }
int __btrfs_setxattr(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; path = btrfs_alloc_path(); if (!path) return -ENOMEM; trans = btrfs_join_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); 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); if (ret) goto out; btrfs_release_path(root, path); /* if we don't have a value then we are removing the xattr */ if (!value) { mod = 1; 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, name, strlen(name), value, size, inode->i_ino); if (ret) goto out; mod = 1; out: if (mod) { inode->i_ctime = CURRENT_TIME; ret = btrfs_update_inode(trans, root, inode); } btrfs_end_transaction(trans, root); 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; if (flags & XATTR_REPLACE) { di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { ret = -ENODATA; goto out; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; btrfs_release_path(path); /* */ if (!value) goto out; } again: ret = btrfs_insert_xattr_item(trans, root, path, btrfs_ino(inode), name, name_len, value, size); /* */ if (ret == -EOVERFLOW) ret = -EEXIST; if (ret == -EEXIST) { if (flags & XATTR_CREATE) goto out; /* */ btrfs_release_path(path); di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { /* */ btrfs_release_path(path); goto again; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; /* */ if (value) { btrfs_release_path(path); goto again; } } 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; if (flags & XATTR_REPLACE) { di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { ret = -ENODATA; goto out; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; btrfs_release_path(path); /* * remove the attribute */ if (!value) goto out; } else { di = btrfs_lookup_xattr(NULL, root, path, btrfs_ino(inode), name, name_len, 0); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } if (!di && !value) goto out; btrfs_release_path(path); } again: ret = btrfs_insert_xattr_item(trans, root, path, btrfs_ino(inode), name, name_len, value, size); /* * If we're setting an xattr to a new value but the new value is say * exactly BTRFS_MAX_XATTR_SIZE, we could end up with EOVERFLOW getting * back from split_leaf. This is because it thinks we'll be extending * the existing item size, but we're asking for enough space to add the * item itself. So if we get EOVERFLOW just set ret to EEXIST and let * the rest of the function figure it out. */ if (ret == -EOVERFLOW) ret = -EEXIST; if (ret == -EEXIST) { if (flags & XATTR_CREATE) goto out; /* * We can't use the path we already have since we won't have the * proper locking for a delete, so release the path and * re-lookup to delete the thing. */ btrfs_release_path(path); di = btrfs_lookup_xattr(trans, root, path, btrfs_ino(inode), name, name_len, -1); if (IS_ERR(di)) { ret = PTR_ERR(di); goto out; } else if (!di) { /* Shouldn't happen but just in case... */ btrfs_release_path(path); goto again; } ret = btrfs_delete_one_dir_name(trans, root, path, di); if (ret) goto out; /* * We have a value to set, so go back and try to insert it now. */ if (value) { btrfs_release_path(path); goto again; } } out: btrfs_free_path(path); return ret; }