474 lines
11 KiB
C
474 lines
11 KiB
C
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// 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 "messages.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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#include "space-info.h"
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#include "fs.h"
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#include "accessors.h"
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#include "super.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 struct btrfs_inode *inode, const char *value,
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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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bool (*ignore)(const struct btrfs_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 struct btrfs_inode *inode, const char *name,
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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(inode, value, value_len);
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}
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/*
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* Check if a property should be ignored (not set) for an inode.
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*
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* @inode: The target inode.
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* @name: The property's name.
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*
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* The caller must be sure the given property name is valid, for example by
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* having previously called btrfs_validate_prop().
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*
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* Returns: true if the property should be ignored for the given inode
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* false if the property must not be ignored for the given inode
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*/
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bool btrfs_ignore_prop(const struct btrfs_inode *inode, const char *name)
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{
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const struct prop_handler *handler;
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handler = find_prop_handler(name, NULL);
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ASSERT(handler != NULL);
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return handler->ignore(inode);
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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(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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return iterate_object_props(root, path, ino, inode_prop_iterator, inode);
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}
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static int prop_compression_validate(const struct btrfs_inode *inode,
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const char *value, size_t len)
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{
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if (!btrfs_inode_can_compress(inode))
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return -EINVAL;
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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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if ((len == 2 && strncmp("no", value, 2) == 0) ||
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(len == 4 && strncmp("none", value, 4) == 0))
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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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/* Reset to defaults */
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if (len == 0) {
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BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
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BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
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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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/* Set NOCOMPRESS flag */
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if ((len == 2 && strncmp("no", value, 2) == 0) ||
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(len == 4 && strncmp("none", value, 4) == 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 bool prop_compression_ignore(const struct btrfs_inode *inode)
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{
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/*
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* Compression only has effect for regular files, and for directories
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* we set it just to propagate it to new files created inside them.
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* Everything else (symlinks, devices, sockets, fifos) is pointless as
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* it will do nothing, so don't waste metadata space on a compression
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* xattr for anything that is neither a file nor a directory.
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*/
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if (!S_ISREG(inode->vfs_inode.i_mode) &&
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!S_ISDIR(inode->vfs_inode.i_mode))
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return true;
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return false;
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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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.ignore = prop_compression_ignore,
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.inheritable = 1
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},
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|
};
|
||
|
|
|
||
|
|
int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
|
||
|
|
struct inode *inode, struct inode *parent)
|
||
|
|
{
|
||
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
||
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
||
|
|
int ret;
|
||
|
|
int i;
|
||
|
|
bool need_reserve = false;
|
||
|
|
|
||
|
|
if (!test_bit(BTRFS_INODE_HAS_PROPS,
|
||
|
|
&BTRFS_I(parent)->runtime_flags))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
|
||
|
|
const struct prop_handler *h = &prop_handlers[i];
|
||
|
|
const char *value;
|
||
|
|
u64 num_bytes = 0;
|
||
|
|
|
||
|
|
if (!h->inheritable)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (h->ignore(BTRFS_I(inode)))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
value = h->extract(parent);
|
||
|
|
if (!value)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is not strictly necessary as the property should be
|
||
|
|
* valid, but in case it isn't, don't propagate it further.
|
||
|
|
*/
|
||
|
|
ret = h->validate(BTRFS_I(inode), value, strlen(value));
|
||
|
|
if (ret)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Currently callers should be reserving 1 item for properties,
|
||
|
|
* since we only have 1 property that we currently support. If
|
||
|
|
* we add more in the future we need to try and reserve more
|
||
|
|
* space for them. But we should also revisit how we do space
|
||
|
|
* reservations if we do add more properties in the future.
|
||
|
|
*/
|
||
|
|
if (need_reserve) {
|
||
|
|
num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
|
||
|
|
ret = btrfs_block_rsv_add(fs_info, trans->block_rsv,
|
||
|
|
num_bytes,
|
||
|
|
BTRFS_RESERVE_NO_FLUSH);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = btrfs_setxattr(trans, inode, h->xattr_name, value,
|
||
|
|
strlen(value), 0);
|
||
|
|
if (!ret) {
|
||
|
|
ret = h->apply(inode, value, strlen(value));
|
||
|
|
if (ret)
|
||
|
|
btrfs_setxattr(trans, inode, h->xattr_name,
|
||
|
|
NULL, 0, 0);
|
||
|
|
else
|
||
|
|
set_bit(BTRFS_INODE_HAS_PROPS,
|
||
|
|
&BTRFS_I(inode)->runtime_flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (need_reserve) {
|
||
|
|
btrfs_block_rsv_release(fs_info, trans->block_rsv,
|
||
|
|
num_bytes, NULL);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
need_reserve = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int __init btrfs_props_init(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
|
||
|
|
struct prop_handler *p = &prop_handlers[i];
|
||
|
|
u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
|
||
|
|
|
||
|
|
hash_add(prop_handlers_ht, &p->node, h);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|