450 строки
10 KiB
C
450 строки
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
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*/
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#include <linux/hashtable.h>
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#include "props.h"
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#include "btrfs_inode.h"
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#include "transaction.h"
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#include "ctree.h"
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#include "xattr.h"
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#include "compression.h"
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#define BTRFS_PROP_HANDLERS_HT_BITS 8
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static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS);
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struct prop_handler {
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struct hlist_node node;
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const char *xattr_name;
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int (*validate)(const char *value, size_t len);
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int (*apply)(struct inode *inode, const char *value, size_t len);
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const char *(*extract)(struct inode *inode);
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int inheritable;
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};
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static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
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{
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struct hlist_head *h;
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h = &prop_handlers_ht[hash_min(hash, BTRFS_PROP_HANDLERS_HT_BITS)];
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if (hlist_empty(h))
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return NULL;
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return h;
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}
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static const struct prop_handler *
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find_prop_handler(const char *name,
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const struct hlist_head *handlers)
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{
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struct prop_handler *h;
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if (!handlers) {
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u64 hash = btrfs_name_hash(name, strlen(name));
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handlers = find_prop_handlers_by_hash(hash);
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if (!handlers)
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return NULL;
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}
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hlist_for_each_entry(h, handlers, node)
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if (!strcmp(h->xattr_name, name))
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return h;
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return NULL;
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}
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int btrfs_validate_prop(const char *name, const char *value, size_t value_len)
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{
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const struct prop_handler *handler;
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if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
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return -EINVAL;
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handler = find_prop_handler(name, NULL);
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if (!handler)
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return -EINVAL;
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if (value_len == 0)
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return 0;
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return handler->validate(value, value_len);
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}
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int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
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const char *name, const char *value, size_t value_len,
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int flags)
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{
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const struct prop_handler *handler;
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int ret;
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handler = find_prop_handler(name, NULL);
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if (!handler)
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return -EINVAL;
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if (value_len == 0) {
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ret = btrfs_setxattr(trans, inode, handler->xattr_name,
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NULL, 0, flags);
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if (ret)
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return ret;
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ret = handler->apply(inode, NULL, 0);
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ASSERT(ret == 0);
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return ret;
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}
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ret = btrfs_setxattr(trans, inode, handler->xattr_name, value,
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value_len, flags);
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if (ret)
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return ret;
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ret = handler->apply(inode, value, value_len);
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if (ret) {
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btrfs_setxattr(trans, inode, handler->xattr_name, NULL,
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0, flags);
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return ret;
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}
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set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
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return 0;
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}
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static int iterate_object_props(struct btrfs_root *root,
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struct btrfs_path *path,
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u64 objectid,
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void (*iterator)(void *,
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const struct prop_handler *,
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const char *,
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size_t),
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void *ctx)
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{
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int ret;
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char *name_buf = NULL;
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char *value_buf = NULL;
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int name_buf_len = 0;
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int value_buf_len = 0;
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while (1) {
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struct btrfs_key key;
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struct btrfs_dir_item *di;
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struct extent_buffer *leaf;
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u32 total_len, cur, this_len;
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int slot;
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const struct hlist_head *handlers;
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slot = path->slots[0];
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leaf = path->nodes[0];
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if (slot >= btrfs_header_nritems(leaf)) {
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ret = btrfs_next_leaf(root, path);
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if (ret < 0)
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goto out;
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else if (ret > 0)
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break;
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continue;
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}
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btrfs_item_key_to_cpu(leaf, &key, slot);
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if (key.objectid != objectid)
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break;
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if (key.type != BTRFS_XATTR_ITEM_KEY)
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break;
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handlers = find_prop_handlers_by_hash(key.offset);
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if (!handlers)
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goto next_slot;
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di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
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cur = 0;
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total_len = btrfs_item_size_nr(leaf, slot);
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while (cur < total_len) {
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u32 name_len = btrfs_dir_name_len(leaf, di);
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u32 data_len = btrfs_dir_data_len(leaf, di);
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unsigned long name_ptr, data_ptr;
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const struct prop_handler *handler;
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this_len = sizeof(*di) + name_len + data_len;
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name_ptr = (unsigned long)(di + 1);
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data_ptr = name_ptr + name_len;
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if (name_len <= XATTR_BTRFS_PREFIX_LEN ||
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memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
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name_ptr,
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XATTR_BTRFS_PREFIX_LEN))
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goto next_dir_item;
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if (name_len >= name_buf_len) {
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kfree(name_buf);
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name_buf_len = name_len + 1;
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name_buf = kmalloc(name_buf_len, GFP_NOFS);
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if (!name_buf) {
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ret = -ENOMEM;
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goto out;
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}
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}
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read_extent_buffer(leaf, name_buf, name_ptr, name_len);
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name_buf[name_len] = '\0';
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handler = find_prop_handler(name_buf, handlers);
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if (!handler)
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goto next_dir_item;
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if (data_len > value_buf_len) {
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kfree(value_buf);
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value_buf_len = data_len;
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value_buf = kmalloc(data_len, GFP_NOFS);
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if (!value_buf) {
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ret = -ENOMEM;
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goto out;
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}
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}
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read_extent_buffer(leaf, value_buf, data_ptr, data_len);
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iterator(ctx, handler, value_buf, data_len);
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next_dir_item:
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cur += this_len;
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di = (struct btrfs_dir_item *)((char *) di + this_len);
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}
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next_slot:
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path->slots[0]++;
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}
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ret = 0;
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out:
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btrfs_release_path(path);
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kfree(name_buf);
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kfree(value_buf);
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return ret;
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}
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static void inode_prop_iterator(void *ctx,
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const struct prop_handler *handler,
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const char *value,
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size_t len)
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{
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struct inode *inode = ctx;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret;
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ret = handler->apply(inode, value, len);
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if (unlikely(ret))
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btrfs_warn(root->fs_info,
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"error applying prop %s to ino %llu (root %llu): %d",
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handler->xattr_name, btrfs_ino(BTRFS_I(inode)),
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root->root_key.objectid, ret);
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else
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set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
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}
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int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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u64 ino = btrfs_ino(BTRFS_I(inode));
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int ret;
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ret = iterate_object_props(root, path, ino, inode_prop_iterator, inode);
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return ret;
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}
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static int prop_compression_validate(const char *value, size_t len)
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{
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if (!value)
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return 0;
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if (btrfs_compress_is_valid_type(value, len))
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return 0;
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return -EINVAL;
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}
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static int prop_compression_apply(struct inode *inode, const char *value,
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size_t len)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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int type;
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if (len == 0) {
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BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
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BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
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BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
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return 0;
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}
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if (!strncmp("lzo", value, 3)) {
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type = BTRFS_COMPRESS_LZO;
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btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
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} else if (!strncmp("zlib", value, 4)) {
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type = BTRFS_COMPRESS_ZLIB;
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} else if (!strncmp("zstd", value, 4)) {
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type = BTRFS_COMPRESS_ZSTD;
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btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
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} else {
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return -EINVAL;
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}
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BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
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BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
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BTRFS_I(inode)->prop_compress = type;
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return 0;
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}
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static const char *prop_compression_extract(struct inode *inode)
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{
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switch (BTRFS_I(inode)->prop_compress) {
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case BTRFS_COMPRESS_ZLIB:
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case BTRFS_COMPRESS_LZO:
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case BTRFS_COMPRESS_ZSTD:
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return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress);
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default:
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break;
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}
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return NULL;
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}
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static struct prop_handler prop_handlers[] = {
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{
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.xattr_name = XATTR_BTRFS_PREFIX "compression",
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.validate = prop_compression_validate,
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.apply = prop_compression_apply,
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.extract = prop_compression_extract,
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.inheritable = 1
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},
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};
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static int inherit_props(struct btrfs_trans_handle *trans,
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struct inode *inode,
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struct inode *parent)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct btrfs_fs_info *fs_info = root->fs_info;
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int ret;
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int i;
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bool need_reserve = false;
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if (!test_bit(BTRFS_INODE_HAS_PROPS,
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&BTRFS_I(parent)->runtime_flags))
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return 0;
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for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
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const struct prop_handler *h = &prop_handlers[i];
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const char *value;
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u64 num_bytes = 0;
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if (!h->inheritable)
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continue;
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value = h->extract(parent);
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if (!value)
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continue;
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/*
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* This is not strictly necessary as the property should be
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* valid, but in case it isn't, don't propagate it futher.
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*/
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ret = h->validate(value, strlen(value));
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if (ret)
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continue;
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/*
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* Currently callers should be reserving 1 item for properties,
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* since we only have 1 property that we currently support. If
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* we add more in the future we need to try and reserve more
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* space for them. But we should also revisit how we do space
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* reservations if we do add more properties in the future.
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*/
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if (need_reserve) {
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num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
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ret = btrfs_block_rsv_add(root, trans->block_rsv,
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num_bytes, BTRFS_RESERVE_NO_FLUSH);
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if (ret)
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return ret;
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}
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ret = btrfs_setxattr(trans, inode, h->xattr_name, value,
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strlen(value), 0);
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if (!ret) {
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ret = h->apply(inode, value, strlen(value));
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if (ret)
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btrfs_setxattr(trans, inode, h->xattr_name,
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NULL, 0, 0);
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else
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set_bit(BTRFS_INODE_HAS_PROPS,
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&BTRFS_I(inode)->runtime_flags);
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}
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if (need_reserve) {
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btrfs_block_rsv_release(fs_info, trans->block_rsv,
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num_bytes);
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if (ret)
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return ret;
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}
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need_reserve = true;
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}
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return 0;
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}
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int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
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struct inode *inode,
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struct inode *dir)
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{
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if (!dir)
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return 0;
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return inherit_props(trans, inode, dir);
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}
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int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_root *parent_root)
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{
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struct super_block *sb = root->fs_info->sb;
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struct btrfs_key key;
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struct inode *parent_inode, *child_inode;
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int ret;
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key.objectid = BTRFS_FIRST_FREE_OBJECTID;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
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if (IS_ERR(parent_inode))
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return PTR_ERR(parent_inode);
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child_inode = btrfs_iget(sb, &key, root, NULL);
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if (IS_ERR(child_inode)) {
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iput(parent_inode);
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return PTR_ERR(child_inode);
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}
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ret = inherit_props(trans, child_inode, parent_inode);
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iput(child_inode);
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iput(parent_inode);
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return ret;
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}
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void __init btrfs_props_init(void)
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{
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int i;
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hash_init(prop_handlers_ht);
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for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
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struct prop_handler *p = &prop_handlers[i];
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u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
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hash_add(prop_handlers_ht, &p->node, h);
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}
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}
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