2007-06-12 13:07:21 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public
|
|
|
|
* License v2 as published by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
* General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public
|
|
|
|
* License along with this program; if not, write to the
|
|
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
|
* Boston, MA 021110-1307, USA.
|
|
|
|
*/
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
#include <linux/fs.h>
|
2007-06-12 15:36:58 +00:00
|
|
|
#include <linux/sched.h>
|
2007-09-17 14:58:06 +00:00
|
|
|
#include <linux/writeback.h>
|
2007-10-15 20:14:19 +00:00
|
|
|
#include <linux/pagemap.h>
|
2007-03-22 19:59:16 +00:00
|
|
|
#include "ctree.h"
|
|
|
|
#include "disk-io.h"
|
|
|
|
#include "transaction.h"
|
2008-06-25 20:01:30 +00:00
|
|
|
#include "locking.h"
|
2008-07-28 19:32:19 +00:00
|
|
|
#include "ref-cache.h"
|
2007-03-22 19:59:16 +00:00
|
|
|
|
2007-03-25 15:35:08 +00:00
|
|
|
static int total_trans = 0;
|
2007-04-02 14:50:19 +00:00
|
|
|
extern struct kmem_cache *btrfs_trans_handle_cachep;
|
|
|
|
extern struct kmem_cache *btrfs_transaction_cachep;
|
|
|
|
|
2007-04-09 14:42:37 +00:00
|
|
|
#define BTRFS_ROOT_TRANS_TAG 0
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline void put_transaction(struct btrfs_transaction *transaction)
|
2007-03-22 19:59:16 +00:00
|
|
|
{
|
2007-04-02 14:50:19 +00:00
|
|
|
WARN_ON(transaction->use_count == 0);
|
2007-03-22 19:59:16 +00:00
|
|
|
transaction->use_count--;
|
2007-03-25 15:35:08 +00:00
|
|
|
if (transaction->use_count == 0) {
|
|
|
|
WARN_ON(total_trans == 0);
|
|
|
|
total_trans--;
|
2007-04-20 01:01:03 +00:00
|
|
|
list_del_init(&transaction->list);
|
2007-04-02 14:50:19 +00:00
|
|
|
memset(transaction, 0, sizeof(*transaction));
|
|
|
|
kmem_cache_free(btrfs_transaction_cachep, transaction);
|
2007-03-25 15:35:08 +00:00
|
|
|
}
|
2007-03-22 19:59:16 +00:00
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int join_transaction(struct btrfs_root *root)
|
2007-03-22 19:59:16 +00:00
|
|
|
{
|
|
|
|
struct btrfs_transaction *cur_trans;
|
|
|
|
cur_trans = root->fs_info->running_transaction;
|
|
|
|
if (!cur_trans) {
|
2007-04-02 14:50:19 +00:00
|
|
|
cur_trans = kmem_cache_alloc(btrfs_transaction_cachep,
|
|
|
|
GFP_NOFS);
|
2007-03-25 15:35:08 +00:00
|
|
|
total_trans++;
|
2007-03-22 19:59:16 +00:00
|
|
|
BUG_ON(!cur_trans);
|
2007-04-09 14:42:37 +00:00
|
|
|
root->fs_info->generation++;
|
2008-01-18 15:54:22 +00:00
|
|
|
root->fs_info->last_alloc = 0;
|
2008-01-31 21:45:07 +00:00
|
|
|
root->fs_info->last_data_alloc = 0;
|
2007-08-10 20:22:09 +00:00
|
|
|
cur_trans->num_writers = 1;
|
|
|
|
cur_trans->num_joined = 0;
|
2007-04-09 14:42:37 +00:00
|
|
|
cur_trans->transid = root->fs_info->generation;
|
2007-03-22 19:59:16 +00:00
|
|
|
init_waitqueue_head(&cur_trans->writer_wait);
|
|
|
|
init_waitqueue_head(&cur_trans->commit_wait);
|
|
|
|
cur_trans->in_commit = 0;
|
2008-07-17 16:54:14 +00:00
|
|
|
cur_trans->blocked = 0;
|
2007-03-23 14:01:08 +00:00
|
|
|
cur_trans->use_count = 1;
|
2007-03-22 19:59:16 +00:00
|
|
|
cur_trans->commit_done = 0;
|
2007-06-08 19:33:54 +00:00
|
|
|
cur_trans->start_time = get_seconds();
|
2008-01-08 20:46:30 +00:00
|
|
|
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
|
2007-04-20 01:01:03 +00:00
|
|
|
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
|
2008-01-24 21:13:08 +00:00
|
|
|
extent_io_tree_init(&cur_trans->dirty_pages,
|
2007-10-15 20:14:19 +00:00
|
|
|
root->fs_info->btree_inode->i_mapping,
|
|
|
|
GFP_NOFS);
|
2008-06-09 13:35:50 +00:00
|
|
|
spin_lock(&root->fs_info->new_trans_lock);
|
|
|
|
root->fs_info->running_transaction = cur_trans;
|
|
|
|
spin_unlock(&root->fs_info->new_trans_lock);
|
2007-08-10 20:22:09 +00:00
|
|
|
} else {
|
|
|
|
cur_trans->num_writers++;
|
|
|
|
cur_trans->num_joined++;
|
2007-03-22 19:59:16 +00:00
|
|
|
}
|
2007-08-10 20:22:09 +00:00
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int record_root_in_trans(struct btrfs_root *root)
|
2007-08-07 20:15:09 +00:00
|
|
|
{
|
2008-07-30 13:26:11 +00:00
|
|
|
struct btrfs_dirty_root *dirty;
|
2007-08-07 20:15:09 +00:00
|
|
|
u64 running_trans_id = root->fs_info->running_transaction->transid;
|
|
|
|
if (root->ref_cows && root->last_trans < running_trans_id) {
|
|
|
|
WARN_ON(root == root->fs_info->extent_root);
|
|
|
|
if (root->root_item.refs != 0) {
|
|
|
|
radix_tree_tag_set(&root->fs_info->fs_roots_radix,
|
|
|
|
(unsigned long)root->root_key.objectid,
|
|
|
|
BTRFS_ROOT_TRANS_TAG);
|
2008-07-28 19:32:19 +00:00
|
|
|
|
|
|
|
dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
|
|
|
|
BUG_ON(!dirty);
|
|
|
|
dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS);
|
|
|
|
BUG_ON(!dirty->root);
|
|
|
|
dirty->latest_root = root;
|
|
|
|
INIT_LIST_HEAD(&dirty->list);
|
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
root->commit_root = btrfs_root_node(root);
|
2008-07-28 19:32:19 +00:00
|
|
|
|
|
|
|
memcpy(dirty->root, root, sizeof(*root));
|
|
|
|
spin_lock_init(&dirty->root->node_lock);
|
2008-07-30 20:29:20 +00:00
|
|
|
spin_lock_init(&dirty->root->list_lock);
|
2008-07-28 19:32:19 +00:00
|
|
|
mutex_init(&dirty->root->objectid_mutex);
|
2008-07-30 20:29:20 +00:00
|
|
|
INIT_LIST_HEAD(&dirty->root->dead_list);
|
2008-07-28 19:32:19 +00:00
|
|
|
dirty->root->node = root->commit_root;
|
|
|
|
dirty->root->commit_root = NULL;
|
2008-07-30 20:29:20 +00:00
|
|
|
|
|
|
|
spin_lock(&root->list_lock);
|
|
|
|
list_add(&dirty->root->dead_list, &root->dead_list);
|
|
|
|
spin_unlock(&root->list_lock);
|
|
|
|
|
|
|
|
root->dirty_root = dirty;
|
2007-08-07 20:15:09 +00:00
|
|
|
} else {
|
|
|
|
WARN_ON(1);
|
|
|
|
}
|
|
|
|
root->last_trans = running_trans_id;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-07-31 14:48:37 +00:00
|
|
|
static void wait_current_trans(struct btrfs_root *root)
|
2007-03-22 19:59:16 +00:00
|
|
|
{
|
2008-07-17 16:54:14 +00:00
|
|
|
struct btrfs_transaction *cur_trans;
|
2007-03-22 19:59:16 +00:00
|
|
|
|
2008-07-17 16:54:14 +00:00
|
|
|
cur_trans = root->fs_info->running_transaction;
|
2008-07-31 14:48:37 +00:00
|
|
|
if (cur_trans && cur_trans->blocked) {
|
2008-07-17 16:54:14 +00:00
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
cur_trans->use_count++;
|
|
|
|
while(1) {
|
|
|
|
prepare_to_wait(&root->fs_info->transaction_wait, &wait,
|
|
|
|
TASK_UNINTERRUPTIBLE);
|
|
|
|
if (cur_trans->blocked) {
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
schedule();
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
finish_wait(&root->fs_info->transaction_wait,
|
|
|
|
&wait);
|
|
|
|
} else {
|
|
|
|
finish_wait(&root->fs_info->transaction_wait,
|
|
|
|
&wait);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
put_transaction(cur_trans);
|
|
|
|
}
|
2008-07-31 14:48:37 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
|
|
|
|
int num_blocks, int join)
|
|
|
|
{
|
|
|
|
struct btrfs_trans_handle *h =
|
|
|
|
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
if (!join)
|
|
|
|
wait_current_trans(root);
|
2007-03-22 19:59:16 +00:00
|
|
|
ret = join_transaction(root);
|
|
|
|
BUG_ON(ret);
|
2007-04-09 14:42:37 +00:00
|
|
|
|
2007-08-07 20:15:09 +00:00
|
|
|
record_root_in_trans(root);
|
|
|
|
h->transid = root->fs_info->running_transaction->transid;
|
2007-03-22 19:59:16 +00:00
|
|
|
h->transaction = root->fs_info->running_transaction;
|
|
|
|
h->blocks_reserved = num_blocks;
|
|
|
|
h->blocks_used = 0;
|
2007-04-30 19:25:45 +00:00
|
|
|
h->block_group = NULL;
|
2007-08-09 00:17:12 +00:00
|
|
|
h->alloc_exclude_nr = 0;
|
|
|
|
h->alloc_exclude_start = 0;
|
2007-03-22 19:59:16 +00:00
|
|
|
root->fs_info->running_transaction->use_count++;
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
return h;
|
|
|
|
}
|
|
|
|
|
2008-07-17 16:54:14 +00:00
|
|
|
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
|
|
|
|
int num_blocks)
|
|
|
|
{
|
|
|
|
return start_transaction(root, num_blocks, 0);
|
|
|
|
}
|
|
|
|
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
|
|
|
|
int num_blocks)
|
|
|
|
{
|
|
|
|
return start_transaction(root, num_blocks, 1);
|
|
|
|
}
|
|
|
|
|
2008-06-25 20:01:31 +00:00
|
|
|
static noinline int wait_for_commit(struct btrfs_root *root,
|
|
|
|
struct btrfs_transaction *commit)
|
|
|
|
{
|
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
while(!commit->commit_done) {
|
|
|
|
prepare_to_wait(&commit->commit_wait, &wait,
|
|
|
|
TASK_UNINTERRUPTIBLE);
|
|
|
|
if (commit->commit_done)
|
|
|
|
break;
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
schedule();
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
}
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
finish_wait(&commit->commit_wait, &wait);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-07-31 14:48:37 +00:00
|
|
|
static void throttle_on_drops(struct btrfs_root *root)
|
2008-07-29 20:15:18 +00:00
|
|
|
{
|
|
|
|
struct btrfs_fs_info *info = root->fs_info;
|
2008-08-04 12:20:15 +00:00
|
|
|
int harder_count = 0;
|
2008-07-29 20:15:18 +00:00
|
|
|
|
2008-08-04 12:20:15 +00:00
|
|
|
harder:
|
2008-07-29 20:15:18 +00:00
|
|
|
if (atomic_read(&info->throttles)) {
|
|
|
|
DEFINE_WAIT(wait);
|
|
|
|
int thr;
|
|
|
|
thr = atomic_read(&info->throttle_gen);
|
|
|
|
|
|
|
|
do {
|
|
|
|
prepare_to_wait(&info->transaction_throttle,
|
|
|
|
&wait, TASK_UNINTERRUPTIBLE);
|
|
|
|
if (!atomic_read(&info->throttles)) {
|
|
|
|
finish_wait(&info->transaction_throttle, &wait);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
schedule();
|
|
|
|
finish_wait(&info->transaction_throttle, &wait);
|
|
|
|
} while (thr == atomic_read(&info->throttle_gen));
|
2008-08-04 12:20:15 +00:00
|
|
|
harder_count++;
|
|
|
|
|
|
|
|
if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 &&
|
|
|
|
harder_count < 2)
|
|
|
|
goto harder;
|
|
|
|
|
|
|
|
if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 &&
|
|
|
|
harder_count < 10)
|
|
|
|
goto harder;
|
|
|
|
|
|
|
|
if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 &&
|
|
|
|
harder_count < 20)
|
|
|
|
goto harder;
|
2008-07-29 20:15:18 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-31 14:48:37 +00:00
|
|
|
void btrfs_throttle(struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
wait_current_trans(root);
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
|
|
|
|
throttle_on_drops(root);
|
|
|
|
}
|
|
|
|
|
2008-06-25 20:01:31 +00:00
|
|
|
static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root, int throttle)
|
2007-03-22 19:59:16 +00:00
|
|
|
{
|
|
|
|
struct btrfs_transaction *cur_trans;
|
2008-07-29 20:15:18 +00:00
|
|
|
struct btrfs_fs_info *info = root->fs_info;
|
2007-04-06 19:37:36 +00:00
|
|
|
|
2008-07-29 20:15:18 +00:00
|
|
|
mutex_lock(&info->trans_mutex);
|
|
|
|
cur_trans = info->running_transaction;
|
2007-06-28 19:57:36 +00:00
|
|
|
WARN_ON(cur_trans != trans->transaction);
|
2007-03-23 14:01:08 +00:00
|
|
|
WARN_ON(cur_trans->num_writers < 1);
|
2007-06-28 19:57:36 +00:00
|
|
|
cur_trans->num_writers--;
|
2008-06-25 20:01:31 +00:00
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
if (waitqueue_active(&cur_trans->writer_wait))
|
|
|
|
wake_up(&cur_trans->writer_wait);
|
|
|
|
put_transaction(cur_trans);
|
2008-07-29 20:15:18 +00:00
|
|
|
mutex_unlock(&info->trans_mutex);
|
2007-03-30 18:27:56 +00:00
|
|
|
memset(trans, 0, sizeof(*trans));
|
2007-04-02 14:50:19 +00:00
|
|
|
kmem_cache_free(btrfs_trans_handle_cachep, trans);
|
2008-07-29 20:15:18 +00:00
|
|
|
|
|
|
|
if (throttle)
|
2008-07-31 14:48:37 +00:00
|
|
|
throttle_on_drops(root);
|
2008-07-29 20:15:18 +00:00
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-06-25 20:01:31 +00:00
|
|
|
int btrfs_end_transaction(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
return __btrfs_end_transaction(trans, root, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
return __btrfs_end_transaction(trans, root, 1);
|
|
|
|
}
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
|
|
|
|
int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
|
|
|
{
|
2007-04-28 13:29:35 +00:00
|
|
|
int ret;
|
|
|
|
int err;
|
|
|
|
int werr = 0;
|
2008-01-24 21:13:08 +00:00
|
|
|
struct extent_io_tree *dirty_pages;
|
2007-04-28 13:29:35 +00:00
|
|
|
struct page *page;
|
|
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
2007-10-15 20:14:19 +00:00
|
|
|
u64 start;
|
|
|
|
u64 end;
|
|
|
|
unsigned long index;
|
2007-04-28 13:29:35 +00:00
|
|
|
|
|
|
|
if (!trans || !trans->transaction) {
|
|
|
|
return filemap_write_and_wait(btree_inode->i_mapping);
|
|
|
|
}
|
|
|
|
dirty_pages = &trans->transaction->dirty_pages;
|
|
|
|
while(1) {
|
2007-10-15 20:14:19 +00:00
|
|
|
ret = find_first_extent_bit(dirty_pages, 0, &start, &end,
|
|
|
|
EXTENT_DIRTY);
|
|
|
|
if (ret)
|
2007-04-28 13:29:35 +00:00
|
|
|
break;
|
2007-10-15 20:14:19 +00:00
|
|
|
clear_extent_dirty(dirty_pages, start, end, GFP_NOFS);
|
|
|
|
while(start <= end) {
|
|
|
|
index = start >> PAGE_CACHE_SHIFT;
|
2007-10-30 20:56:53 +00:00
|
|
|
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
|
2007-10-15 20:14:19 +00:00
|
|
|
page = find_lock_page(btree_inode->i_mapping, index);
|
2007-04-28 13:29:35 +00:00
|
|
|
if (!page)
|
|
|
|
continue;
|
2007-08-07 20:15:09 +00:00
|
|
|
if (PageWriteback(page)) {
|
|
|
|
if (PageDirty(page))
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
else {
|
|
|
|
unlock_page(page);
|
|
|
|
page_cache_release(page);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
2007-04-28 13:29:35 +00:00
|
|
|
err = write_one_page(page, 0);
|
|
|
|
if (err)
|
|
|
|
werr = err;
|
|
|
|
page_cache_release(page);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
err = filemap_fdatawait(btree_inode->i_mapping);
|
|
|
|
if (err)
|
|
|
|
werr = err;
|
|
|
|
return werr;
|
2007-03-22 19:59:16 +00:00
|
|
|
}
|
|
|
|
|
2008-03-24 19:01:56 +00:00
|
|
|
static int update_cowonly_root(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
2007-03-22 19:59:16 +00:00
|
|
|
{
|
|
|
|
int ret;
|
2008-03-24 19:01:56 +00:00
|
|
|
u64 old_root_bytenr;
|
|
|
|
struct btrfs_root *tree_root = root->fs_info->tree_root;
|
2007-03-22 19:59:16 +00:00
|
|
|
|
2008-03-24 19:01:56 +00:00
|
|
|
btrfs_write_dirty_block_groups(trans, root);
|
2007-03-22 19:59:16 +00:00
|
|
|
while(1) {
|
2008-03-24 19:01:56 +00:00
|
|
|
old_root_bytenr = btrfs_root_bytenr(&root->root_item);
|
|
|
|
if (old_root_bytenr == root->node->start)
|
2007-03-22 19:59:16 +00:00
|
|
|
break;
|
2008-03-24 19:01:56 +00:00
|
|
|
btrfs_set_root_bytenr(&root->root_item,
|
|
|
|
root->node->start);
|
|
|
|
btrfs_set_root_level(&root->root_item,
|
|
|
|
btrfs_header_level(root->node));
|
2007-03-22 19:59:16 +00:00
|
|
|
ret = btrfs_update_root(trans, tree_root,
|
2008-03-24 19:01:56 +00:00
|
|
|
&root->root_key,
|
|
|
|
&root->root_item);
|
2007-03-22 19:59:16 +00:00
|
|
|
BUG_ON(ret);
|
2008-03-24 19:01:56 +00:00
|
|
|
btrfs_write_dirty_block_groups(trans, root);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
struct list_head *next;
|
|
|
|
|
|
|
|
while(!list_empty(&fs_info->dirty_cowonly_roots)) {
|
|
|
|
next = fs_info->dirty_cowonly_roots.next;
|
|
|
|
list_del_init(next);
|
|
|
|
root = list_entry(next, struct btrfs_root, dirty_list);
|
|
|
|
update_cowonly_root(trans, root);
|
2007-03-22 19:59:16 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-09-11 15:15:39 +00:00
|
|
|
int btrfs_add_dead_root(struct btrfs_root *root,
|
|
|
|
struct btrfs_root *latest,
|
|
|
|
struct list_head *dead_list)
|
2007-06-22 18:16:25 +00:00
|
|
|
{
|
2008-07-30 13:26:11 +00:00
|
|
|
struct btrfs_dirty_root *dirty;
|
2007-06-22 18:16:25 +00:00
|
|
|
|
|
|
|
dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
|
|
|
|
if (!dirty)
|
|
|
|
return -ENOMEM;
|
|
|
|
dirty->root = root;
|
2007-09-11 15:15:39 +00:00
|
|
|
dirty->latest_root = latest;
|
2007-06-22 18:16:25 +00:00
|
|
|
list_add(&dirty->list, dead_list);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int add_dirty_roots(struct btrfs_trans_handle *trans,
|
|
|
|
struct radix_tree_root *radix,
|
|
|
|
struct list_head *list)
|
2007-04-09 14:42:37 +00:00
|
|
|
{
|
2008-07-30 13:26:11 +00:00
|
|
|
struct btrfs_dirty_root *dirty;
|
2007-04-09 14:42:37 +00:00
|
|
|
struct btrfs_root *gang[8];
|
|
|
|
struct btrfs_root *root;
|
|
|
|
int i;
|
|
|
|
int ret;
|
2007-06-22 18:16:25 +00:00
|
|
|
int err = 0;
|
2007-06-22 18:16:25 +00:00
|
|
|
u32 refs;
|
2007-06-22 18:16:25 +00:00
|
|
|
|
2007-04-09 14:42:37 +00:00
|
|
|
while(1) {
|
|
|
|
ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0,
|
|
|
|
ARRAY_SIZE(gang),
|
|
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
|
|
if (ret == 0)
|
|
|
|
break;
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
|
|
root = gang[i];
|
2007-04-10 20:58:11 +00:00
|
|
|
radix_tree_tag_clear(radix,
|
|
|
|
(unsigned long)root->root_key.objectid,
|
|
|
|
BTRFS_ROOT_TRANS_TAG);
|
2008-07-28 19:32:19 +00:00
|
|
|
|
|
|
|
BUG_ON(!root->ref_tree);
|
2008-07-28 19:32:51 +00:00
|
|
|
dirty = root->dirty_root;
|
2008-07-28 19:32:19 +00:00
|
|
|
|
2007-04-09 14:42:37 +00:00
|
|
|
if (root->commit_root == root->node) {
|
2007-10-15 20:15:53 +00:00
|
|
|
WARN_ON(root->node->start !=
|
|
|
|
btrfs_root_bytenr(&root->root_item));
|
2008-07-28 19:32:19 +00:00
|
|
|
|
2007-10-15 20:14:19 +00:00
|
|
|
free_extent_buffer(root->commit_root);
|
2007-04-09 14:42:37 +00:00
|
|
|
root->commit_root = NULL;
|
2008-07-30 20:29:20 +00:00
|
|
|
|
|
|
|
spin_lock(&root->list_lock);
|
|
|
|
list_del_init(&dirty->root->dead_list);
|
|
|
|
spin_unlock(&root->list_lock);
|
|
|
|
|
2008-07-28 19:32:19 +00:00
|
|
|
kfree(dirty->root);
|
|
|
|
kfree(dirty);
|
2007-08-29 19:47:34 +00:00
|
|
|
|
|
|
|
/* make sure to update the root on disk
|
|
|
|
* so we get any updates to the block used
|
|
|
|
* counts
|
|
|
|
*/
|
|
|
|
err = btrfs_update_root(trans,
|
|
|
|
root->fs_info->tree_root,
|
|
|
|
&root->root_key,
|
|
|
|
&root->root_item);
|
2007-04-09 14:42:37 +00:00
|
|
|
continue;
|
|
|
|
}
|
2007-08-07 19:52:19 +00:00
|
|
|
|
|
|
|
memset(&root->root_item.drop_progress, 0,
|
|
|
|
sizeof(struct btrfs_disk_key));
|
|
|
|
root->root_item.drop_level = 0;
|
2007-04-09 14:42:37 +00:00
|
|
|
root->commit_root = NULL;
|
|
|
|
root->root_key.offset = root->fs_info->generation;
|
2007-10-15 20:15:53 +00:00
|
|
|
btrfs_set_root_bytenr(&root->root_item,
|
|
|
|
root->node->start);
|
|
|
|
btrfs_set_root_level(&root->root_item,
|
|
|
|
btrfs_header_level(root->node));
|
2007-04-09 14:42:37 +00:00
|
|
|
err = btrfs_insert_root(trans, root->fs_info->tree_root,
|
|
|
|
&root->root_key,
|
|
|
|
&root->root_item);
|
2007-06-22 18:16:25 +00:00
|
|
|
if (err)
|
|
|
|
break;
|
2007-08-07 19:52:19 +00:00
|
|
|
|
|
|
|
refs = btrfs_root_refs(&dirty->root->root_item);
|
|
|
|
btrfs_set_root_refs(&dirty->root->root_item, refs - 1);
|
2007-06-22 18:16:25 +00:00
|
|
|
err = btrfs_update_root(trans, root->fs_info->tree_root,
|
2007-08-07 19:52:19 +00:00
|
|
|
&dirty->root->root_key,
|
|
|
|
&dirty->root->root_item);
|
2007-06-22 18:16:25 +00:00
|
|
|
|
|
|
|
BUG_ON(err);
|
2007-08-07 19:52:19 +00:00
|
|
|
if (refs == 1) {
|
2007-06-22 18:16:25 +00:00
|
|
|
list_add(&dirty->list, list);
|
2007-08-07 19:52:19 +00:00
|
|
|
} else {
|
|
|
|
WARN_ON(1);
|
2008-07-28 19:32:19 +00:00
|
|
|
free_extent_buffer(dirty->root->node);
|
2007-08-07 19:52:19 +00:00
|
|
|
kfree(dirty->root);
|
2007-06-22 18:16:25 +00:00
|
|
|
kfree(dirty);
|
2007-08-07 19:52:19 +00:00
|
|
|
}
|
2007-04-09 14:42:37 +00:00
|
|
|
}
|
|
|
|
}
|
2007-06-22 18:16:25 +00:00
|
|
|
return err;
|
2007-04-09 14:42:37 +00:00
|
|
|
}
|
|
|
|
|
2007-08-10 18:06:19 +00:00
|
|
|
int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
|
|
|
|
{
|
|
|
|
struct btrfs_fs_info *info = root->fs_info;
|
|
|
|
int ret;
|
|
|
|
struct btrfs_trans_handle *trans;
|
2007-09-17 14:58:06 +00:00
|
|
|
unsigned long nr;
|
2007-08-10 18:06:19 +00:00
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
smp_mb();
|
2007-08-10 18:06:19 +00:00
|
|
|
if (root->defrag_running)
|
|
|
|
return 0;
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
2007-10-15 20:17:34 +00:00
|
|
|
while (1) {
|
2007-08-10 18:06:19 +00:00
|
|
|
root->defrag_running = 1;
|
|
|
|
ret = btrfs_defrag_leaves(trans, root, cacheonly);
|
2007-09-17 14:58:06 +00:00
|
|
|
nr = trans->blocks_used;
|
2007-08-10 18:06:19 +00:00
|
|
|
btrfs_end_transaction(trans, root);
|
2007-09-17 14:58:06 +00:00
|
|
|
btrfs_btree_balance_dirty(info->tree_root, nr);
|
2007-08-10 18:06:19 +00:00
|
|
|
cond_resched();
|
|
|
|
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
2008-06-25 20:01:31 +00:00
|
|
|
if (root->fs_info->closing || ret != -EAGAIN)
|
2007-08-10 18:06:19 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
root->defrag_running = 0;
|
2008-06-25 20:01:30 +00:00
|
|
|
smp_mb();
|
2007-08-10 18:06:19 +00:00
|
|
|
btrfs_end_transaction(trans, root);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
|
|
|
|
struct list_head *list)
|
2007-04-09 14:42:37 +00:00
|
|
|
{
|
2008-07-30 13:26:11 +00:00
|
|
|
struct btrfs_dirty_root *dirty;
|
2007-04-09 14:42:37 +00:00
|
|
|
struct btrfs_trans_handle *trans;
|
2007-09-17 14:58:06 +00:00
|
|
|
unsigned long nr;
|
2007-10-15 20:15:53 +00:00
|
|
|
u64 num_bytes;
|
|
|
|
u64 bytes_used;
|
2008-07-30 20:29:20 +00:00
|
|
|
u64 max_useless;
|
2007-06-22 18:16:25 +00:00
|
|
|
int ret = 0;
|
2007-08-07 19:52:19 +00:00
|
|
|
int err;
|
|
|
|
|
2007-04-09 14:42:37 +00:00
|
|
|
while(!list_empty(list)) {
|
2007-08-29 19:47:34 +00:00
|
|
|
struct btrfs_root *root;
|
|
|
|
|
2008-07-30 13:26:11 +00:00
|
|
|
dirty = list_entry(list->prev, struct btrfs_dirty_root, list);
|
2007-04-09 14:42:37 +00:00
|
|
|
list_del_init(&dirty->list);
|
2007-06-22 18:16:25 +00:00
|
|
|
|
2007-10-15 20:15:53 +00:00
|
|
|
num_bytes = btrfs_root_used(&dirty->root->root_item);
|
2007-08-29 19:47:34 +00:00
|
|
|
root = dirty->latest_root;
|
2008-06-25 20:01:30 +00:00
|
|
|
atomic_inc(&root->fs_info->throttles);
|
2007-08-29 19:47:34 +00:00
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
mutex_lock(&root->fs_info->drop_mutex);
|
2007-08-07 19:52:19 +00:00
|
|
|
while(1) {
|
|
|
|
trans = btrfs_start_transaction(tree_root, 1);
|
|
|
|
ret = btrfs_drop_snapshot(trans, dirty->root);
|
|
|
|
if (ret != -EAGAIN) {
|
|
|
|
break;
|
|
|
|
}
|
2007-08-29 19:47:34 +00:00
|
|
|
|
2007-08-07 19:52:19 +00:00
|
|
|
err = btrfs_update_root(trans,
|
|
|
|
tree_root,
|
|
|
|
&dirty->root->root_key,
|
|
|
|
&dirty->root->root_item);
|
|
|
|
if (err)
|
|
|
|
ret = err;
|
2007-09-17 14:58:06 +00:00
|
|
|
nr = trans->blocks_used;
|
2008-07-28 19:32:51 +00:00
|
|
|
ret = btrfs_end_transaction(trans, tree_root);
|
2007-08-07 19:52:19 +00:00
|
|
|
BUG_ON(ret);
|
2008-06-25 20:01:30 +00:00
|
|
|
|
|
|
|
mutex_unlock(&root->fs_info->drop_mutex);
|
2007-09-17 14:58:06 +00:00
|
|
|
btrfs_btree_balance_dirty(tree_root, nr);
|
2007-10-15 20:18:14 +00:00
|
|
|
cond_resched();
|
2008-06-25 20:01:30 +00:00
|
|
|
mutex_lock(&root->fs_info->drop_mutex);
|
2007-08-07 19:52:19 +00:00
|
|
|
}
|
2007-04-09 14:42:37 +00:00
|
|
|
BUG_ON(ret);
|
2008-06-25 20:01:30 +00:00
|
|
|
atomic_dec(&root->fs_info->throttles);
|
2008-07-28 19:32:51 +00:00
|
|
|
wake_up(&root->fs_info->transaction_throttle);
|
2007-08-29 19:47:34 +00:00
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
mutex_lock(&root->fs_info->alloc_mutex);
|
2007-10-15 20:15:53 +00:00
|
|
|
num_bytes -= btrfs_root_used(&dirty->root->root_item);
|
|
|
|
bytes_used = btrfs_root_used(&root->root_item);
|
|
|
|
if (num_bytes) {
|
2007-08-29 19:47:34 +00:00
|
|
|
record_root_in_trans(root);
|
2007-10-15 20:14:19 +00:00
|
|
|
btrfs_set_root_used(&root->root_item,
|
2007-10-15 20:15:53 +00:00
|
|
|
bytes_used - num_bytes);
|
2007-08-29 19:47:34 +00:00
|
|
|
}
|
2008-06-25 20:01:30 +00:00
|
|
|
mutex_unlock(&root->fs_info->alloc_mutex);
|
|
|
|
|
2007-08-07 19:52:19 +00:00
|
|
|
ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key);
|
2007-08-29 19:47:34 +00:00
|
|
|
if (ret) {
|
|
|
|
BUG();
|
2007-06-22 18:16:25 +00:00
|
|
|
break;
|
2007-08-29 19:47:34 +00:00
|
|
|
}
|
2008-06-25 20:01:30 +00:00
|
|
|
mutex_unlock(&root->fs_info->drop_mutex);
|
|
|
|
|
2008-07-30 20:29:20 +00:00
|
|
|
spin_lock(&root->list_lock);
|
|
|
|
list_del_init(&dirty->root->dead_list);
|
|
|
|
if (!list_empty(&root->dead_list)) {
|
|
|
|
struct btrfs_root *oldest;
|
|
|
|
oldest = list_entry(root->dead_list.prev,
|
|
|
|
struct btrfs_root, dead_list);
|
|
|
|
max_useless = oldest->root_key.offset - 1;
|
|
|
|
} else {
|
|
|
|
max_useless = root->root_key.offset - 1;
|
|
|
|
}
|
|
|
|
spin_unlock(&root->list_lock);
|
|
|
|
|
2007-09-17 14:58:06 +00:00
|
|
|
nr = trans->blocks_used;
|
2007-04-09 14:42:37 +00:00
|
|
|
ret = btrfs_end_transaction(trans, tree_root);
|
|
|
|
BUG_ON(ret);
|
2007-06-22 18:16:25 +00:00
|
|
|
|
2008-07-30 20:29:20 +00:00
|
|
|
ret = btrfs_remove_leaf_refs(root, max_useless);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-10-15 20:14:48 +00:00
|
|
|
free_extent_buffer(dirty->root->node);
|
2007-08-07 19:52:19 +00:00
|
|
|
kfree(dirty->root);
|
2007-04-09 14:42:37 +00:00
|
|
|
kfree(dirty);
|
2007-09-17 14:58:06 +00:00
|
|
|
|
|
|
|
btrfs_btree_balance_dirty(tree_root, nr);
|
2007-10-15 20:18:14 +00:00
|
|
|
cond_resched();
|
2007-04-09 14:42:37 +00:00
|
|
|
}
|
2007-06-22 18:16:25 +00:00
|
|
|
return ret;
|
2007-04-09 14:42:37 +00:00
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
|
2008-01-08 20:46:30 +00:00
|
|
|
struct btrfs_fs_info *fs_info,
|
|
|
|
struct btrfs_pending_snapshot *pending)
|
|
|
|
{
|
|
|
|
struct btrfs_key key;
|
2008-02-01 21:35:04 +00:00
|
|
|
struct btrfs_root_item *new_root_item;
|
2008-01-08 20:46:30 +00:00
|
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
|
|
struct btrfs_root *root = pending->root;
|
|
|
|
struct extent_buffer *tmp;
|
2008-06-25 20:01:30 +00:00
|
|
|
struct extent_buffer *old;
|
2008-01-08 20:46:30 +00:00
|
|
|
int ret;
|
2008-06-10 01:57:42 +00:00
|
|
|
int namelen;
|
2008-01-08 20:46:30 +00:00
|
|
|
u64 objectid;
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
|
|
|
|
if (!new_root_item) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
2008-01-08 20:46:30 +00:00
|
|
|
ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid);
|
|
|
|
if (ret)
|
|
|
|
goto fail;
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
|
2008-01-08 20:46:30 +00:00
|
|
|
|
|
|
|
key.objectid = objectid;
|
|
|
|
key.offset = 1;
|
|
|
|
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
|
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
old = btrfs_lock_root_node(root);
|
2008-08-01 19:11:20 +00:00
|
|
|
btrfs_cow_block(trans, root, old, NULL, 0, &old, 0);
|
2008-01-08 20:46:30 +00:00
|
|
|
|
2008-06-25 20:01:30 +00:00
|
|
|
btrfs_copy_root(trans, root, old, &tmp, objectid);
|
|
|
|
btrfs_tree_unlock(old);
|
|
|
|
free_extent_buffer(old);
|
2008-01-08 20:46:30 +00:00
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
btrfs_set_root_bytenr(new_root_item, tmp->start);
|
|
|
|
btrfs_set_root_level(new_root_item, btrfs_header_level(tmp));
|
2008-01-08 20:46:30 +00:00
|
|
|
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
|
2008-02-01 21:35:04 +00:00
|
|
|
new_root_item);
|
2008-06-25 20:01:30 +00:00
|
|
|
btrfs_tree_unlock(tmp);
|
2008-01-08 20:46:30 +00:00
|
|
|
free_extent_buffer(tmp);
|
|
|
|
if (ret)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* insert the directory item
|
|
|
|
*/
|
|
|
|
key.offset = (u64)-1;
|
2008-06-10 01:57:42 +00:00
|
|
|
namelen = strlen(pending->name);
|
2008-01-08 20:46:30 +00:00
|
|
|
ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
|
2008-06-10 01:57:42 +00:00
|
|
|
pending->name, namelen,
|
2008-01-08 20:46:30 +00:00
|
|
|
root->fs_info->sb->s_root->d_inode->i_ino,
|
2008-07-24 16:12:38 +00:00
|
|
|
&key, BTRFS_FT_DIR, 0);
|
2008-01-08 20:46:30 +00:00
|
|
|
|
|
|
|
if (ret)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
|
|
|
|
pending->name, strlen(pending->name), objectid,
|
2008-07-24 16:12:38 +00:00
|
|
|
root->fs_info->sb->s_root->d_inode->i_ino, 0);
|
2008-06-10 01:57:42 +00:00
|
|
|
|
|
|
|
/* Invalidate existing dcache entry for new snapshot. */
|
|
|
|
btrfs_invalidate_dcache_root(root, pending->name, namelen);
|
|
|
|
|
2008-01-08 20:46:30 +00:00
|
|
|
fail:
|
2008-02-01 21:35:04 +00:00
|
|
|
kfree(new_root_item);
|
2008-01-08 20:46:30 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-02-01 21:35:04 +00:00
|
|
|
static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_fs_info *fs_info)
|
2008-01-08 20:46:30 +00:00
|
|
|
{
|
|
|
|
struct btrfs_pending_snapshot *pending;
|
|
|
|
struct list_head *head = &trans->transaction->pending_snapshots;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
while(!list_empty(head)) {
|
|
|
|
pending = list_entry(head->next,
|
|
|
|
struct btrfs_pending_snapshot, list);
|
|
|
|
ret = create_pending_snapshot(trans, fs_info, pending);
|
|
|
|
BUG_ON(ret);
|
|
|
|
list_del(&pending->list);
|
|
|
|
kfree(pending->name);
|
|
|
|
kfree(pending);
|
|
|
|
}
|
2008-01-08 20:46:30 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root)
|
|
|
|
{
|
2007-08-10 20:22:09 +00:00
|
|
|
unsigned long joined = 0;
|
|
|
|
unsigned long timeout = 1;
|
2007-03-22 19:59:16 +00:00
|
|
|
struct btrfs_transaction *cur_trans;
|
2007-04-20 01:01:03 +00:00
|
|
|
struct btrfs_transaction *prev_trans = NULL;
|
2008-03-24 19:01:56 +00:00
|
|
|
struct btrfs_root *chunk_root = root->fs_info->chunk_root;
|
2007-04-09 14:42:37 +00:00
|
|
|
struct list_head dirty_fs_roots;
|
2008-01-24 21:13:08 +00:00
|
|
|
struct extent_io_tree *pinned_copy;
|
2007-03-22 19:59:16 +00:00
|
|
|
DEFINE_WAIT(wait);
|
2007-08-10 20:22:09 +00:00
|
|
|
int ret;
|
2007-03-22 19:59:16 +00:00
|
|
|
|
2007-04-09 14:42:37 +00:00
|
|
|
INIT_LIST_HEAD(&dirty_fs_roots);
|
2007-04-06 19:37:36 +00:00
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
if (trans->transaction->in_commit) {
|
|
|
|
cur_trans = trans->transaction;
|
|
|
|
trans->transaction->use_count++;
|
2007-06-28 19:57:36 +00:00
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
2007-03-22 19:59:16 +00:00
|
|
|
btrfs_end_transaction(trans, root);
|
2007-06-28 19:57:36 +00:00
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
ret = wait_for_commit(root, cur_trans);
|
|
|
|
BUG_ON(ret);
|
2007-08-10 20:22:09 +00:00
|
|
|
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
2007-03-22 19:59:16 +00:00
|
|
|
put_transaction(cur_trans);
|
2007-08-10 20:22:09 +00:00
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2008-01-03 14:08:48 +00:00
|
|
|
|
|
|
|
pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS);
|
|
|
|
if (!pinned_copy)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2008-01-24 21:13:08 +00:00
|
|
|
extent_io_tree_init(pinned_copy,
|
2008-01-03 14:08:48 +00:00
|
|
|
root->fs_info->btree_inode->i_mapping, GFP_NOFS);
|
|
|
|
|
2007-04-02 14:50:19 +00:00
|
|
|
trans->transaction->in_commit = 1;
|
2008-07-17 16:54:14 +00:00
|
|
|
trans->transaction->blocked = 1;
|
2007-06-28 19:57:36 +00:00
|
|
|
cur_trans = trans->transaction;
|
|
|
|
if (cur_trans->list.prev != &root->fs_info->trans_list) {
|
|
|
|
prev_trans = list_entry(cur_trans->list.prev,
|
|
|
|
struct btrfs_transaction, list);
|
|
|
|
if (!prev_trans->commit_done) {
|
|
|
|
prev_trans->use_count++;
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
|
|
|
|
wait_for_commit(root, prev_trans);
|
|
|
|
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
2007-08-10 20:22:09 +00:00
|
|
|
put_transaction(prev_trans);
|
2007-06-28 19:57:36 +00:00
|
|
|
}
|
|
|
|
}
|
2007-08-10 20:22:09 +00:00
|
|
|
|
|
|
|
do {
|
|
|
|
joined = cur_trans->num_joined;
|
2007-04-02 14:50:19 +00:00
|
|
|
WARN_ON(cur_trans != trans->transaction);
|
2007-08-10 20:22:09 +00:00
|
|
|
prepare_to_wait(&cur_trans->writer_wait, &wait,
|
2007-03-22 19:59:16 +00:00
|
|
|
TASK_UNINTERRUPTIBLE);
|
2007-08-10 20:22:09 +00:00
|
|
|
|
|
|
|
if (cur_trans->num_writers > 1)
|
|
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
|
|
else
|
|
|
|
timeout = 1;
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
2007-08-10 20:22:09 +00:00
|
|
|
|
|
|
|
schedule_timeout(timeout);
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
2007-08-10 20:22:09 +00:00
|
|
|
finish_wait(&cur_trans->writer_wait, &wait);
|
|
|
|
} while (cur_trans->num_writers > 1 ||
|
|
|
|
(cur_trans->num_joined != joined));
|
|
|
|
|
2008-01-08 20:46:30 +00:00
|
|
|
ret = create_pending_snapshots(trans, root->fs_info);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-04-02 14:50:19 +00:00
|
|
|
WARN_ON(cur_trans != trans->transaction);
|
2008-01-08 20:46:30 +00:00
|
|
|
|
2007-06-22 18:16:25 +00:00
|
|
|
ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix,
|
|
|
|
&dirty_fs_roots);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
2007-03-22 19:59:16 +00:00
|
|
|
ret = btrfs_commit_tree_roots(trans, root);
|
|
|
|
BUG_ON(ret);
|
2007-06-22 18:16:25 +00:00
|
|
|
|
2007-03-25 15:35:08 +00:00
|
|
|
cur_trans = root->fs_info->running_transaction;
|
2008-01-15 13:40:48 +00:00
|
|
|
spin_lock(&root->fs_info->new_trans_lock);
|
2007-03-25 15:35:08 +00:00
|
|
|
root->fs_info->running_transaction = NULL;
|
2008-01-15 13:40:48 +00:00
|
|
|
spin_unlock(&root->fs_info->new_trans_lock);
|
2007-06-26 14:06:50 +00:00
|
|
|
btrfs_set_super_generation(&root->fs_info->super_copy,
|
|
|
|
cur_trans->transid);
|
|
|
|
btrfs_set_super_root(&root->fs_info->super_copy,
|
2007-10-15 20:15:53 +00:00
|
|
|
root->fs_info->tree_root->node->start);
|
|
|
|
btrfs_set_super_root_level(&root->fs_info->super_copy,
|
|
|
|
btrfs_header_level(root->fs_info->tree_root->node));
|
2007-10-15 20:14:19 +00:00
|
|
|
|
2008-03-24 19:01:56 +00:00
|
|
|
btrfs_set_super_chunk_root(&root->fs_info->super_copy,
|
|
|
|
chunk_root->node->start);
|
|
|
|
btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
|
|
|
|
btrfs_header_level(chunk_root->node));
|
2008-05-07 15:43:44 +00:00
|
|
|
memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
|
|
|
|
sizeof(root->fs_info->super_copy));
|
2007-06-28 19:57:36 +00:00
|
|
|
|
2008-01-03 14:08:48 +00:00
|
|
|
btrfs_copy_pinned(root, pinned_copy);
|
2007-06-28 19:57:36 +00:00
|
|
|
|
2008-07-17 16:54:14 +00:00
|
|
|
trans->transaction->blocked = 0;
|
2008-07-17 16:53:50 +00:00
|
|
|
wake_up(&root->fs_info->transaction_throttle);
|
2008-07-17 16:54:14 +00:00
|
|
|
wake_up(&root->fs_info->transaction_wait);
|
2008-07-17 16:53:50 +00:00
|
|
|
|
2007-03-25 15:35:08 +00:00
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
2007-03-22 19:59:16 +00:00
|
|
|
ret = btrfs_write_and_wait_transaction(trans, root);
|
|
|
|
BUG_ON(ret);
|
|
|
|
write_ctree_super(trans, root);
|
2008-01-03 14:08:48 +00:00
|
|
|
|
|
|
|
btrfs_finish_extent_commit(trans, root, pinned_copy);
|
2007-03-25 15:35:08 +00:00
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
2008-01-03 14:08:48 +00:00
|
|
|
|
|
|
|
kfree(pinned_copy);
|
|
|
|
|
2007-04-02 14:50:19 +00:00
|
|
|
cur_trans->commit_done = 1;
|
2007-08-10 20:22:09 +00:00
|
|
|
root->fs_info->last_trans_committed = cur_trans->transid;
|
2007-04-02 14:50:19 +00:00
|
|
|
wake_up(&cur_trans->commit_wait);
|
2007-03-25 15:35:08 +00:00
|
|
|
put_transaction(cur_trans);
|
2007-03-22 19:59:16 +00:00
|
|
|
put_transaction(cur_trans);
|
2007-08-29 19:47:34 +00:00
|
|
|
|
2008-07-30 20:29:20 +00:00
|
|
|
list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots);
|
2007-06-08 22:11:48 +00:00
|
|
|
if (root->fs_info->closing)
|
|
|
|
list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots);
|
2007-08-29 19:47:34 +00:00
|
|
|
|
2007-03-25 15:35:08 +00:00
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
2007-04-02 14:50:19 +00:00
|
|
|
kmem_cache_free(btrfs_trans_handle_cachep, trans);
|
2007-03-22 19:59:16 +00:00
|
|
|
|
2007-06-08 22:11:48 +00:00
|
|
|
if (root->fs_info->closing) {
|
|
|
|
drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
|
|
|
|
}
|
2007-03-22 19:59:16 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-08-10 18:06:19 +00:00
|
|
|
int btrfs_clean_old_snapshots(struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
struct list_head dirty_roots;
|
|
|
|
INIT_LIST_HEAD(&dirty_roots);
|
2008-06-25 20:01:31 +00:00
|
|
|
again:
|
2007-08-10 18:06:19 +00:00
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
list_splice_init(&root->fs_info->dead_roots, &dirty_roots);
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
|
|
|
|
if (!list_empty(&dirty_roots)) {
|
|
|
|
drop_dirty_roots(root, &dirty_roots);
|
2008-06-25 20:01:31 +00:00
|
|
|
goto again;
|
2007-08-10 18:06:19 +00:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|