![Elena Reshetova](/assets/img/avatar_default.png)
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
972 lines
26 KiB
C
972 lines
26 KiB
C
/*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include "ctree.h"
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#include "delayed-ref.h"
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#include "transaction.h"
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#include "qgroup.h"
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struct kmem_cache *btrfs_delayed_ref_head_cachep;
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struct kmem_cache *btrfs_delayed_tree_ref_cachep;
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struct kmem_cache *btrfs_delayed_data_ref_cachep;
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struct kmem_cache *btrfs_delayed_extent_op_cachep;
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/*
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* delayed back reference update tracking. For subvolume trees
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* we queue up extent allocations and backref maintenance for
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* delayed processing. This avoids deep call chains where we
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* add extents in the middle of btrfs_search_slot, and it allows
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* us to buffer up frequently modified backrefs in an rb tree instead
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* of hammering updates on the extent allocation tree.
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*/
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/*
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* compare two delayed tree backrefs with same bytenr and type
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*/
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static int comp_tree_refs(struct btrfs_delayed_tree_ref *ref2,
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struct btrfs_delayed_tree_ref *ref1, int type)
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{
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if (type == BTRFS_TREE_BLOCK_REF_KEY) {
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if (ref1->root < ref2->root)
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return -1;
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if (ref1->root > ref2->root)
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return 1;
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} else {
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if (ref1->parent < ref2->parent)
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return -1;
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if (ref1->parent > ref2->parent)
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return 1;
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}
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return 0;
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}
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/*
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* compare two delayed data backrefs with same bytenr and type
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*/
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static int comp_data_refs(struct btrfs_delayed_data_ref *ref2,
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struct btrfs_delayed_data_ref *ref1)
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{
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if (ref1->node.type == BTRFS_EXTENT_DATA_REF_KEY) {
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if (ref1->root < ref2->root)
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return -1;
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if (ref1->root > ref2->root)
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return 1;
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if (ref1->objectid < ref2->objectid)
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return -1;
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if (ref1->objectid > ref2->objectid)
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return 1;
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if (ref1->offset < ref2->offset)
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return -1;
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if (ref1->offset > ref2->offset)
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return 1;
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} else {
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if (ref1->parent < ref2->parent)
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return -1;
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if (ref1->parent > ref2->parent)
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return 1;
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}
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return 0;
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}
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/* insert a new ref to head ref rbtree */
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static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
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struct rb_node *node)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent_node = NULL;
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struct btrfs_delayed_ref_head *entry;
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struct btrfs_delayed_ref_head *ins;
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u64 bytenr;
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ins = rb_entry(node, struct btrfs_delayed_ref_head, href_node);
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bytenr = ins->node.bytenr;
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while (*p) {
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parent_node = *p;
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entry = rb_entry(parent_node, struct btrfs_delayed_ref_head,
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href_node);
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if (bytenr < entry->node.bytenr)
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p = &(*p)->rb_left;
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else if (bytenr > entry->node.bytenr)
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p = &(*p)->rb_right;
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else
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return entry;
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}
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rb_link_node(node, parent_node, p);
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rb_insert_color(node, root);
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return NULL;
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}
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/*
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* find an head entry based on bytenr. This returns the delayed ref
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* head if it was able to find one, or NULL if nothing was in that spot.
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* If return_bigger is given, the next bigger entry is returned if no exact
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* match is found.
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*/
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static struct btrfs_delayed_ref_head *
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find_ref_head(struct rb_root *root, u64 bytenr,
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int return_bigger)
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{
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struct rb_node *n;
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struct btrfs_delayed_ref_head *entry;
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n = root->rb_node;
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entry = NULL;
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while (n) {
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entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node);
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if (bytenr < entry->node.bytenr)
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n = n->rb_left;
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else if (bytenr > entry->node.bytenr)
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n = n->rb_right;
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else
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return entry;
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}
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if (entry && return_bigger) {
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if (bytenr > entry->node.bytenr) {
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n = rb_next(&entry->href_node);
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if (!n)
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n = rb_first(root);
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entry = rb_entry(n, struct btrfs_delayed_ref_head,
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href_node);
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return entry;
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}
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return entry;
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}
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return NULL;
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}
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int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
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struct btrfs_delayed_ref_head *head)
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{
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struct btrfs_delayed_ref_root *delayed_refs;
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delayed_refs = &trans->transaction->delayed_refs;
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assert_spin_locked(&delayed_refs->lock);
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if (mutex_trylock(&head->mutex))
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return 0;
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refcount_inc(&head->node.refs);
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spin_unlock(&delayed_refs->lock);
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mutex_lock(&head->mutex);
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spin_lock(&delayed_refs->lock);
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if (!head->node.in_tree) {
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mutex_unlock(&head->mutex);
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btrfs_put_delayed_ref(&head->node);
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return -EAGAIN;
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}
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btrfs_put_delayed_ref(&head->node);
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return 0;
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}
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static inline void drop_delayed_ref(struct btrfs_trans_handle *trans,
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struct btrfs_delayed_ref_root *delayed_refs,
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struct btrfs_delayed_ref_head *head,
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struct btrfs_delayed_ref_node *ref)
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{
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if (btrfs_delayed_ref_is_head(ref)) {
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head = btrfs_delayed_node_to_head(ref);
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rb_erase(&head->href_node, &delayed_refs->href_root);
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} else {
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assert_spin_locked(&head->lock);
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list_del(&ref->list);
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if (!list_empty(&ref->add_list))
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list_del(&ref->add_list);
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}
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ref->in_tree = 0;
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btrfs_put_delayed_ref(ref);
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atomic_dec(&delayed_refs->num_entries);
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if (trans->delayed_ref_updates)
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trans->delayed_ref_updates--;
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}
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static bool merge_ref(struct btrfs_trans_handle *trans,
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struct btrfs_delayed_ref_root *delayed_refs,
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struct btrfs_delayed_ref_head *head,
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struct btrfs_delayed_ref_node *ref,
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u64 seq)
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{
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struct btrfs_delayed_ref_node *next;
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bool done = false;
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next = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
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list);
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while (!done && &next->list != &head->ref_list) {
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int mod;
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struct btrfs_delayed_ref_node *next2;
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next2 = list_next_entry(next, list);
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if (next == ref)
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goto next;
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if (seq && next->seq >= seq)
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goto next;
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if (next->type != ref->type)
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goto next;
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if ((ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
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ref->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
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comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref),
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btrfs_delayed_node_to_tree_ref(next),
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ref->type))
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goto next;
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if ((ref->type == BTRFS_EXTENT_DATA_REF_KEY ||
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ref->type == BTRFS_SHARED_DATA_REF_KEY) &&
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comp_data_refs(btrfs_delayed_node_to_data_ref(ref),
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btrfs_delayed_node_to_data_ref(next)))
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goto next;
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if (ref->action == next->action) {
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mod = next->ref_mod;
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} else {
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if (ref->ref_mod < next->ref_mod) {
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swap(ref, next);
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done = true;
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}
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mod = -next->ref_mod;
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}
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drop_delayed_ref(trans, delayed_refs, head, next);
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ref->ref_mod += mod;
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if (ref->ref_mod == 0) {
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drop_delayed_ref(trans, delayed_refs, head, ref);
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done = true;
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} else {
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/*
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* Can't have multiples of the same ref on a tree block.
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*/
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WARN_ON(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
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ref->type == BTRFS_SHARED_BLOCK_REF_KEY);
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}
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next:
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next = next2;
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}
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return done;
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}
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void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_delayed_ref_root *delayed_refs,
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struct btrfs_delayed_ref_head *head)
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{
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struct btrfs_delayed_ref_node *ref;
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u64 seq = 0;
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assert_spin_locked(&head->lock);
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if (list_empty(&head->ref_list))
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return;
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/* We don't have too many refs to merge for data. */
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if (head->is_data)
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return;
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spin_lock(&fs_info->tree_mod_seq_lock);
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if (!list_empty(&fs_info->tree_mod_seq_list)) {
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struct seq_list *elem;
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elem = list_first_entry(&fs_info->tree_mod_seq_list,
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struct seq_list, list);
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seq = elem->seq;
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}
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spin_unlock(&fs_info->tree_mod_seq_lock);
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ref = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
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list);
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while (&ref->list != &head->ref_list) {
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if (seq && ref->seq >= seq)
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goto next;
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if (merge_ref(trans, delayed_refs, head, ref, seq)) {
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if (list_empty(&head->ref_list))
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break;
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ref = list_first_entry(&head->ref_list,
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struct btrfs_delayed_ref_node,
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list);
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continue;
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}
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next:
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ref = list_next_entry(ref, list);
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}
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}
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int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
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struct btrfs_delayed_ref_root *delayed_refs,
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u64 seq)
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{
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struct seq_list *elem;
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int ret = 0;
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spin_lock(&fs_info->tree_mod_seq_lock);
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if (!list_empty(&fs_info->tree_mod_seq_list)) {
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elem = list_first_entry(&fs_info->tree_mod_seq_list,
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struct seq_list, list);
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if (seq >= elem->seq) {
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btrfs_debug(fs_info,
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"holding back delayed_ref %#x.%x, lowest is %#x.%x (%p)",
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(u32)(seq >> 32), (u32)seq,
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(u32)(elem->seq >> 32), (u32)elem->seq,
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delayed_refs);
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ret = 1;
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}
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}
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spin_unlock(&fs_info->tree_mod_seq_lock);
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return ret;
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}
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struct btrfs_delayed_ref_head *
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btrfs_select_ref_head(struct btrfs_trans_handle *trans)
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{
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struct btrfs_delayed_ref_root *delayed_refs;
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struct btrfs_delayed_ref_head *head;
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u64 start;
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bool loop = false;
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delayed_refs = &trans->transaction->delayed_refs;
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again:
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start = delayed_refs->run_delayed_start;
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head = find_ref_head(&delayed_refs->href_root, start, 1);
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if (!head && !loop) {
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delayed_refs->run_delayed_start = 0;
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start = 0;
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loop = true;
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head = find_ref_head(&delayed_refs->href_root, start, 1);
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if (!head)
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return NULL;
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} else if (!head && loop) {
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return NULL;
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}
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while (head->processing) {
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struct rb_node *node;
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node = rb_next(&head->href_node);
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if (!node) {
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if (loop)
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return NULL;
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delayed_refs->run_delayed_start = 0;
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start = 0;
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loop = true;
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goto again;
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}
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head = rb_entry(node, struct btrfs_delayed_ref_head,
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href_node);
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}
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head->processing = 1;
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WARN_ON(delayed_refs->num_heads_ready == 0);
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delayed_refs->num_heads_ready--;
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delayed_refs->run_delayed_start = head->node.bytenr +
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head->node.num_bytes;
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return head;
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}
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/*
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* Helper to insert the ref_node to the tail or merge with tail.
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*
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* Return 0 for insert.
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* Return >0 for merge.
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*/
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static int
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add_delayed_ref_tail_merge(struct btrfs_trans_handle *trans,
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struct btrfs_delayed_ref_root *root,
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struct btrfs_delayed_ref_head *href,
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struct btrfs_delayed_ref_node *ref)
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{
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struct btrfs_delayed_ref_node *exist;
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int mod;
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int ret = 0;
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spin_lock(&href->lock);
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/* Check whether we can merge the tail node with ref */
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if (list_empty(&href->ref_list))
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goto add_tail;
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exist = list_entry(href->ref_list.prev, struct btrfs_delayed_ref_node,
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list);
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/* No need to compare bytenr nor is_head */
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if (exist->type != ref->type || exist->seq != ref->seq)
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goto add_tail;
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if ((exist->type == BTRFS_TREE_BLOCK_REF_KEY ||
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exist->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
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comp_tree_refs(btrfs_delayed_node_to_tree_ref(exist),
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btrfs_delayed_node_to_tree_ref(ref),
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ref->type))
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goto add_tail;
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if ((exist->type == BTRFS_EXTENT_DATA_REF_KEY ||
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exist->type == BTRFS_SHARED_DATA_REF_KEY) &&
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comp_data_refs(btrfs_delayed_node_to_data_ref(exist),
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btrfs_delayed_node_to_data_ref(ref)))
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goto add_tail;
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/* Now we are sure we can merge */
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ret = 1;
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if (exist->action == ref->action) {
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mod = ref->ref_mod;
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} else {
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/* Need to change action */
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if (exist->ref_mod < ref->ref_mod) {
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exist->action = ref->action;
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mod = -exist->ref_mod;
|
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exist->ref_mod = ref->ref_mod;
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if (ref->action == BTRFS_ADD_DELAYED_REF)
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list_add_tail(&exist->add_list,
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&href->ref_add_list);
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else if (ref->action == BTRFS_DROP_DELAYED_REF) {
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ASSERT(!list_empty(&exist->add_list));
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list_del(&exist->add_list);
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} else {
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ASSERT(0);
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}
|
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} else
|
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mod = -ref->ref_mod;
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}
|
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exist->ref_mod += mod;
|
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|
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/* remove existing tail if its ref_mod is zero */
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if (exist->ref_mod == 0)
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drop_delayed_ref(trans, root, href, exist);
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spin_unlock(&href->lock);
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return ret;
|
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|
|
add_tail:
|
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list_add_tail(&ref->list, &href->ref_list);
|
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if (ref->action == BTRFS_ADD_DELAYED_REF)
|
|
list_add_tail(&ref->add_list, &href->ref_add_list);
|
|
atomic_inc(&root->num_entries);
|
|
trans->delayed_ref_updates++;
|
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spin_unlock(&href->lock);
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return ret;
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}
|
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|
|
/*
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|
* helper function to update the accounting in the head ref
|
|
* existing and update must have the same bytenr
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*/
|
|
static noinline void
|
|
update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
|
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struct btrfs_delayed_ref_node *existing,
|
|
struct btrfs_delayed_ref_node *update)
|
|
{
|
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struct btrfs_delayed_ref_head *existing_ref;
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struct btrfs_delayed_ref_head *ref;
|
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int old_ref_mod;
|
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|
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existing_ref = btrfs_delayed_node_to_head(existing);
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ref = btrfs_delayed_node_to_head(update);
|
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BUG_ON(existing_ref->is_data != ref->is_data);
|
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|
|
spin_lock(&existing_ref->lock);
|
|
if (ref->must_insert_reserved) {
|
|
/* if the extent was freed and then
|
|
* reallocated before the delayed ref
|
|
* entries were processed, we can end up
|
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* with an existing head ref without
|
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* the must_insert_reserved flag set.
|
|
* Set it again here
|
|
*/
|
|
existing_ref->must_insert_reserved = ref->must_insert_reserved;
|
|
|
|
/*
|
|
* update the num_bytes so we make sure the accounting
|
|
* is done correctly
|
|
*/
|
|
existing->num_bytes = update->num_bytes;
|
|
|
|
}
|
|
|
|
if (ref->extent_op) {
|
|
if (!existing_ref->extent_op) {
|
|
existing_ref->extent_op = ref->extent_op;
|
|
} else {
|
|
if (ref->extent_op->update_key) {
|
|
memcpy(&existing_ref->extent_op->key,
|
|
&ref->extent_op->key,
|
|
sizeof(ref->extent_op->key));
|
|
existing_ref->extent_op->update_key = true;
|
|
}
|
|
if (ref->extent_op->update_flags) {
|
|
existing_ref->extent_op->flags_to_set |=
|
|
ref->extent_op->flags_to_set;
|
|
existing_ref->extent_op->update_flags = true;
|
|
}
|
|
btrfs_free_delayed_extent_op(ref->extent_op);
|
|
}
|
|
}
|
|
/*
|
|
* update the reference mod on the head to reflect this new operation,
|
|
* only need the lock for this case cause we could be processing it
|
|
* currently, for refs we just added we know we're a-ok.
|
|
*/
|
|
old_ref_mod = existing_ref->total_ref_mod;
|
|
existing->ref_mod += update->ref_mod;
|
|
existing_ref->total_ref_mod += update->ref_mod;
|
|
|
|
/*
|
|
* If we are going to from a positive ref mod to a negative or vice
|
|
* versa we need to make sure to adjust pending_csums accordingly.
|
|
*/
|
|
if (existing_ref->is_data) {
|
|
if (existing_ref->total_ref_mod >= 0 && old_ref_mod < 0)
|
|
delayed_refs->pending_csums -= existing->num_bytes;
|
|
if (existing_ref->total_ref_mod < 0 && old_ref_mod >= 0)
|
|
delayed_refs->pending_csums += existing->num_bytes;
|
|
}
|
|
spin_unlock(&existing_ref->lock);
|
|
}
|
|
|
|
/*
|
|
* helper function to actually insert a head node into the rbtree.
|
|
* this does all the dirty work in terms of maintaining the correct
|
|
* overall modification count.
|
|
*/
|
|
static noinline struct btrfs_delayed_ref_head *
|
|
add_delayed_ref_head(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_delayed_ref_node *ref,
|
|
struct btrfs_qgroup_extent_record *qrecord,
|
|
u64 bytenr, u64 num_bytes, u64 ref_root, u64 reserved,
|
|
int action, int is_data, int *qrecord_inserted_ret)
|
|
{
|
|
struct btrfs_delayed_ref_head *existing;
|
|
struct btrfs_delayed_ref_head *head_ref = NULL;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
int count_mod = 1;
|
|
int must_insert_reserved = 0;
|
|
int qrecord_inserted = 0;
|
|
|
|
/* If reserved is provided, it must be a data extent. */
|
|
BUG_ON(!is_data && reserved);
|
|
|
|
/*
|
|
* the head node stores the sum of all the mods, so dropping a ref
|
|
* should drop the sum in the head node by one.
|
|
*/
|
|
if (action == BTRFS_UPDATE_DELAYED_HEAD)
|
|
count_mod = 0;
|
|
else if (action == BTRFS_DROP_DELAYED_REF)
|
|
count_mod = -1;
|
|
|
|
/*
|
|
* BTRFS_ADD_DELAYED_EXTENT means that we need to update
|
|
* the reserved accounting when the extent is finally added, or
|
|
* if a later modification deletes the delayed ref without ever
|
|
* inserting the extent into the extent allocation tree.
|
|
* ref->must_insert_reserved is the flag used to record
|
|
* that accounting mods are required.
|
|
*
|
|
* Once we record must_insert_reserved, switch the action to
|
|
* BTRFS_ADD_DELAYED_REF because other special casing is not required.
|
|
*/
|
|
if (action == BTRFS_ADD_DELAYED_EXTENT)
|
|
must_insert_reserved = 1;
|
|
else
|
|
must_insert_reserved = 0;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
|
|
/* first set the basic ref node struct up */
|
|
refcount_set(&ref->refs, 1);
|
|
ref->bytenr = bytenr;
|
|
ref->num_bytes = num_bytes;
|
|
ref->ref_mod = count_mod;
|
|
ref->type = 0;
|
|
ref->action = 0;
|
|
ref->is_head = 1;
|
|
ref->in_tree = 1;
|
|
ref->seq = 0;
|
|
|
|
head_ref = btrfs_delayed_node_to_head(ref);
|
|
head_ref->must_insert_reserved = must_insert_reserved;
|
|
head_ref->is_data = is_data;
|
|
INIT_LIST_HEAD(&head_ref->ref_list);
|
|
INIT_LIST_HEAD(&head_ref->ref_add_list);
|
|
head_ref->processing = 0;
|
|
head_ref->total_ref_mod = count_mod;
|
|
head_ref->qgroup_reserved = 0;
|
|
head_ref->qgroup_ref_root = 0;
|
|
|
|
/* Record qgroup extent info if provided */
|
|
if (qrecord) {
|
|
if (ref_root && reserved) {
|
|
head_ref->qgroup_ref_root = ref_root;
|
|
head_ref->qgroup_reserved = reserved;
|
|
}
|
|
|
|
qrecord->bytenr = bytenr;
|
|
qrecord->num_bytes = num_bytes;
|
|
qrecord->old_roots = NULL;
|
|
|
|
if(btrfs_qgroup_trace_extent_nolock(fs_info,
|
|
delayed_refs, qrecord))
|
|
kfree(qrecord);
|
|
else
|
|
qrecord_inserted = 1;
|
|
}
|
|
|
|
spin_lock_init(&head_ref->lock);
|
|
mutex_init(&head_ref->mutex);
|
|
|
|
trace_add_delayed_ref_head(fs_info, ref, head_ref, action);
|
|
|
|
existing = htree_insert(&delayed_refs->href_root,
|
|
&head_ref->href_node);
|
|
if (existing) {
|
|
WARN_ON(ref_root && reserved && existing->qgroup_ref_root
|
|
&& existing->qgroup_reserved);
|
|
update_existing_head_ref(delayed_refs, &existing->node, ref);
|
|
/*
|
|
* we've updated the existing ref, free the newly
|
|
* allocated ref
|
|
*/
|
|
kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
|
|
head_ref = existing;
|
|
} else {
|
|
if (is_data && count_mod < 0)
|
|
delayed_refs->pending_csums += num_bytes;
|
|
delayed_refs->num_heads++;
|
|
delayed_refs->num_heads_ready++;
|
|
atomic_inc(&delayed_refs->num_entries);
|
|
trans->delayed_ref_updates++;
|
|
}
|
|
if (qrecord_inserted_ret)
|
|
*qrecord_inserted_ret = qrecord_inserted;
|
|
return head_ref;
|
|
}
|
|
|
|
/*
|
|
* helper to insert a delayed tree ref into the rbtree.
|
|
*/
|
|
static noinline void
|
|
add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_delayed_ref_head *head_ref,
|
|
struct btrfs_delayed_ref_node *ref, u64 bytenr,
|
|
u64 num_bytes, u64 parent, u64 ref_root, int level,
|
|
int action)
|
|
{
|
|
struct btrfs_delayed_tree_ref *full_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
u64 seq = 0;
|
|
int ret;
|
|
|
|
if (action == BTRFS_ADD_DELAYED_EXTENT)
|
|
action = BTRFS_ADD_DELAYED_REF;
|
|
|
|
if (is_fstree(ref_root))
|
|
seq = atomic64_read(&fs_info->tree_mod_seq);
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
|
|
/* first set the basic ref node struct up */
|
|
refcount_set(&ref->refs, 1);
|
|
ref->bytenr = bytenr;
|
|
ref->num_bytes = num_bytes;
|
|
ref->ref_mod = 1;
|
|
ref->action = action;
|
|
ref->is_head = 0;
|
|
ref->in_tree = 1;
|
|
ref->seq = seq;
|
|
INIT_LIST_HEAD(&ref->list);
|
|
INIT_LIST_HEAD(&ref->add_list);
|
|
|
|
full_ref = btrfs_delayed_node_to_tree_ref(ref);
|
|
full_ref->parent = parent;
|
|
full_ref->root = ref_root;
|
|
if (parent)
|
|
ref->type = BTRFS_SHARED_BLOCK_REF_KEY;
|
|
else
|
|
ref->type = BTRFS_TREE_BLOCK_REF_KEY;
|
|
full_ref->level = level;
|
|
|
|
trace_add_delayed_tree_ref(fs_info, ref, full_ref, action);
|
|
|
|
ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);
|
|
|
|
/*
|
|
* XXX: memory should be freed at the same level allocated.
|
|
* But bad practice is anywhere... Follow it now. Need cleanup.
|
|
*/
|
|
if (ret > 0)
|
|
kmem_cache_free(btrfs_delayed_tree_ref_cachep, full_ref);
|
|
}
|
|
|
|
/*
|
|
* helper to insert a delayed data ref into the rbtree.
|
|
*/
|
|
static noinline void
|
|
add_delayed_data_ref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_delayed_ref_head *head_ref,
|
|
struct btrfs_delayed_ref_node *ref, u64 bytenr,
|
|
u64 num_bytes, u64 parent, u64 ref_root, u64 owner,
|
|
u64 offset, int action)
|
|
{
|
|
struct btrfs_delayed_data_ref *full_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
u64 seq = 0;
|
|
int ret;
|
|
|
|
if (action == BTRFS_ADD_DELAYED_EXTENT)
|
|
action = BTRFS_ADD_DELAYED_REF;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
|
|
if (is_fstree(ref_root))
|
|
seq = atomic64_read(&fs_info->tree_mod_seq);
|
|
|
|
/* first set the basic ref node struct up */
|
|
refcount_set(&ref->refs, 1);
|
|
ref->bytenr = bytenr;
|
|
ref->num_bytes = num_bytes;
|
|
ref->ref_mod = 1;
|
|
ref->action = action;
|
|
ref->is_head = 0;
|
|
ref->in_tree = 1;
|
|
ref->seq = seq;
|
|
INIT_LIST_HEAD(&ref->list);
|
|
INIT_LIST_HEAD(&ref->add_list);
|
|
|
|
full_ref = btrfs_delayed_node_to_data_ref(ref);
|
|
full_ref->parent = parent;
|
|
full_ref->root = ref_root;
|
|
if (parent)
|
|
ref->type = BTRFS_SHARED_DATA_REF_KEY;
|
|
else
|
|
ref->type = BTRFS_EXTENT_DATA_REF_KEY;
|
|
|
|
full_ref->objectid = owner;
|
|
full_ref->offset = offset;
|
|
|
|
trace_add_delayed_data_ref(fs_info, ref, full_ref, action);
|
|
|
|
ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);
|
|
|
|
if (ret > 0)
|
|
kmem_cache_free(btrfs_delayed_data_ref_cachep, full_ref);
|
|
}
|
|
|
|
/*
|
|
* add a delayed tree ref. This does all of the accounting required
|
|
* to make sure the delayed ref is eventually processed before this
|
|
* transaction commits.
|
|
*/
|
|
int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
u64 bytenr, u64 num_bytes, u64 parent,
|
|
u64 ref_root, int level, int action,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_delayed_tree_ref *ref;
|
|
struct btrfs_delayed_ref_head *head_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_qgroup_extent_record *record = NULL;
|
|
int qrecord_inserted;
|
|
|
|
BUG_ON(extent_op && extent_op->is_data);
|
|
ref = kmem_cache_alloc(btrfs_delayed_tree_ref_cachep, GFP_NOFS);
|
|
if (!ref)
|
|
return -ENOMEM;
|
|
|
|
head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
|
|
if (!head_ref)
|
|
goto free_ref;
|
|
|
|
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
|
|
is_fstree(ref_root)) {
|
|
record = kmalloc(sizeof(*record), GFP_NOFS);
|
|
if (!record)
|
|
goto free_head_ref;
|
|
}
|
|
|
|
head_ref->extent_op = extent_op;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
|
|
/*
|
|
* insert both the head node and the new ref without dropping
|
|
* the spin lock
|
|
*/
|
|
head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
|
|
bytenr, num_bytes, 0, 0, action, 0,
|
|
&qrecord_inserted);
|
|
|
|
add_delayed_tree_ref(fs_info, trans, head_ref, &ref->node, bytenr,
|
|
num_bytes, parent, ref_root, level, action);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
if (qrecord_inserted)
|
|
return btrfs_qgroup_trace_extent_post(fs_info, record);
|
|
return 0;
|
|
|
|
free_head_ref:
|
|
kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
|
|
free_ref:
|
|
kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* add a delayed data ref. it's similar to btrfs_add_delayed_tree_ref.
|
|
*/
|
|
int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
u64 bytenr, u64 num_bytes,
|
|
u64 parent, u64 ref_root,
|
|
u64 owner, u64 offset, u64 reserved, int action)
|
|
{
|
|
struct btrfs_delayed_data_ref *ref;
|
|
struct btrfs_delayed_ref_head *head_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_qgroup_extent_record *record = NULL;
|
|
int qrecord_inserted;
|
|
|
|
ref = kmem_cache_alloc(btrfs_delayed_data_ref_cachep, GFP_NOFS);
|
|
if (!ref)
|
|
return -ENOMEM;
|
|
|
|
head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
|
|
if (!head_ref) {
|
|
kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) &&
|
|
is_fstree(ref_root)) {
|
|
record = kmalloc(sizeof(*record), GFP_NOFS);
|
|
if (!record) {
|
|
kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
|
|
kmem_cache_free(btrfs_delayed_ref_head_cachep,
|
|
head_ref);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
head_ref->extent_op = NULL;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
|
|
/*
|
|
* insert both the head node and the new ref without dropping
|
|
* the spin lock
|
|
*/
|
|
head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
|
|
bytenr, num_bytes, ref_root, reserved,
|
|
action, 1, &qrecord_inserted);
|
|
|
|
add_delayed_data_ref(fs_info, trans, head_ref, &ref->node, bytenr,
|
|
num_bytes, parent, ref_root, owner, offset,
|
|
action);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
if (qrecord_inserted)
|
|
return btrfs_qgroup_trace_extent_post(fs_info, record);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans,
|
|
u64 bytenr, u64 num_bytes,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_delayed_ref_head *head_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
|
|
head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
|
|
if (!head_ref)
|
|
return -ENOMEM;
|
|
|
|
head_ref->extent_op = extent_op;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
|
|
add_delayed_ref_head(fs_info, trans, &head_ref->node, NULL, bytenr,
|
|
num_bytes, 0, 0, BTRFS_UPDATE_DELAYED_HEAD,
|
|
extent_op->is_data, NULL);
|
|
|
|
spin_unlock(&delayed_refs->lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this does a simple search for the head node for a given extent.
|
|
* It must be called with the delayed ref spinlock held, and it returns
|
|
* the head node if any where found, or NULL if not.
|
|
*/
|
|
struct btrfs_delayed_ref_head *
|
|
btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
|
|
{
|
|
return find_ref_head(&delayed_refs->href_root, bytenr, 0);
|
|
}
|
|
|
|
void btrfs_delayed_ref_exit(void)
|
|
{
|
|
kmem_cache_destroy(btrfs_delayed_ref_head_cachep);
|
|
kmem_cache_destroy(btrfs_delayed_tree_ref_cachep);
|
|
kmem_cache_destroy(btrfs_delayed_data_ref_cachep);
|
|
kmem_cache_destroy(btrfs_delayed_extent_op_cachep);
|
|
}
|
|
|
|
int btrfs_delayed_ref_init(void)
|
|
{
|
|
btrfs_delayed_ref_head_cachep = kmem_cache_create(
|
|
"btrfs_delayed_ref_head",
|
|
sizeof(struct btrfs_delayed_ref_head), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_delayed_ref_head_cachep)
|
|
goto fail;
|
|
|
|
btrfs_delayed_tree_ref_cachep = kmem_cache_create(
|
|
"btrfs_delayed_tree_ref",
|
|
sizeof(struct btrfs_delayed_tree_ref), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_delayed_tree_ref_cachep)
|
|
goto fail;
|
|
|
|
btrfs_delayed_data_ref_cachep = kmem_cache_create(
|
|
"btrfs_delayed_data_ref",
|
|
sizeof(struct btrfs_delayed_data_ref), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_delayed_data_ref_cachep)
|
|
goto fail;
|
|
|
|
btrfs_delayed_extent_op_cachep = kmem_cache_create(
|
|
"btrfs_delayed_extent_op",
|
|
sizeof(struct btrfs_delayed_extent_op), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_delayed_extent_op_cachep)
|
|
goto fail;
|
|
|
|
return 0;
|
|
fail:
|
|
btrfs_delayed_ref_exit();
|
|
return -ENOMEM;
|
|
}
|