forked from luck/tmp_suning_uos_patched
462045928b
START_SYNC will start a sync/commit, but not wait for it to complete. Any modification started after the ioctl returns is guaranteed not to be included in the commit. If a non-NULL pointer is passed, the transaction id will be returned to userspace. WAIT_SYNC will wait for any in-progress commit to complete. If a transaction id is specified, the ioctl will block and then return (success) when the specified transaction has committed. If it has already committed when we call the ioctl, it returns immediately. If the specified transaction doesn't exist, it returns EINVAL. If no transaction id is specified, WAIT_SYNC will wait for the currently committing transaction to finish it's commit to disk. If there is no currently committing transaction, it returns success. These ioctls are useful for applications which want to impose an ordering on when fs modifications reach disk, but do not want to wait for the full (slow) commit process to do so. Picky callers can take the transid returned by START_SYNC and feed it to WAIT_SYNC, and be certain to wait only as long as necessary for the transaction _they_ started to reach disk. Sloppy callers can START_SYNC and WAIT_SYNC without a transid, and provided they didn't wait too long between the calls, they will get the same result. However, if a second commit starts before they call WAIT_SYNC, they may end up waiting longer for it to commit as well. Even so, a START_SYNC+WAIT_SYNC still guarantees that any operation completed before the START_SYNC reaches disk. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
1410 lines
36 KiB
C
1410 lines
36 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/blkdev.h>
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
#include "transaction.h"
|
|
#include "locking.h"
|
|
#include "tree-log.h"
|
|
|
|
#define BTRFS_ROOT_TRANS_TAG 0
|
|
|
|
static noinline void put_transaction(struct btrfs_transaction *transaction)
|
|
{
|
|
WARN_ON(transaction->use_count == 0);
|
|
transaction->use_count--;
|
|
if (transaction->use_count == 0) {
|
|
list_del_init(&transaction->list);
|
|
memset(transaction, 0, sizeof(*transaction));
|
|
kmem_cache_free(btrfs_transaction_cachep, transaction);
|
|
}
|
|
}
|
|
|
|
static noinline void switch_commit_root(struct btrfs_root *root)
|
|
{
|
|
free_extent_buffer(root->commit_root);
|
|
root->commit_root = btrfs_root_node(root);
|
|
}
|
|
|
|
/*
|
|
* either allocate a new transaction or hop into the existing one
|
|
*/
|
|
static noinline int join_transaction(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_transaction *cur_trans;
|
|
cur_trans = root->fs_info->running_transaction;
|
|
if (!cur_trans) {
|
|
cur_trans = kmem_cache_alloc(btrfs_transaction_cachep,
|
|
GFP_NOFS);
|
|
BUG_ON(!cur_trans);
|
|
root->fs_info->generation++;
|
|
cur_trans->num_writers = 1;
|
|
cur_trans->num_joined = 0;
|
|
cur_trans->transid = root->fs_info->generation;
|
|
init_waitqueue_head(&cur_trans->writer_wait);
|
|
init_waitqueue_head(&cur_trans->commit_wait);
|
|
cur_trans->in_commit = 0;
|
|
cur_trans->blocked = 0;
|
|
cur_trans->use_count = 1;
|
|
cur_trans->commit_done = 0;
|
|
cur_trans->start_time = get_seconds();
|
|
|
|
cur_trans->delayed_refs.root = RB_ROOT;
|
|
cur_trans->delayed_refs.num_entries = 0;
|
|
cur_trans->delayed_refs.num_heads_ready = 0;
|
|
cur_trans->delayed_refs.num_heads = 0;
|
|
cur_trans->delayed_refs.flushing = 0;
|
|
cur_trans->delayed_refs.run_delayed_start = 0;
|
|
spin_lock_init(&cur_trans->delayed_refs.lock);
|
|
|
|
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
|
|
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
|
|
extent_io_tree_init(&cur_trans->dirty_pages,
|
|
root->fs_info->btree_inode->i_mapping,
|
|
GFP_NOFS);
|
|
spin_lock(&root->fs_info->new_trans_lock);
|
|
root->fs_info->running_transaction = cur_trans;
|
|
spin_unlock(&root->fs_info->new_trans_lock);
|
|
} else {
|
|
cur_trans->num_writers++;
|
|
cur_trans->num_joined++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this does all the record keeping required to make sure that a reference
|
|
* counted root is properly recorded in a given transaction. This is required
|
|
* to make sure the old root from before we joined the transaction is deleted
|
|
* when the transaction commits
|
|
*/
|
|
static noinline int record_root_in_trans(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
if (root->ref_cows && root->last_trans < trans->transid) {
|
|
WARN_ON(root == root->fs_info->extent_root);
|
|
WARN_ON(root->commit_root != root->node);
|
|
|
|
radix_tree_tag_set(&root->fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid,
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
root->last_trans = trans->transid;
|
|
btrfs_init_reloc_root(trans, root);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
if (!root->ref_cows)
|
|
return 0;
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (root->last_trans == trans->transid) {
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
return 0;
|
|
}
|
|
|
|
record_root_in_trans(trans, root);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/* wait for commit against the current transaction to become unblocked
|
|
* when this is done, it is safe to start a new transaction, but the current
|
|
* transaction might not be fully on disk.
|
|
*/
|
|
static void wait_current_trans(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_transaction *cur_trans;
|
|
|
|
cur_trans = root->fs_info->running_transaction;
|
|
if (cur_trans && cur_trans->blocked) {
|
|
DEFINE_WAIT(wait);
|
|
cur_trans->use_count++;
|
|
while (1) {
|
|
prepare_to_wait(&root->fs_info->transaction_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (!cur_trans->blocked)
|
|
break;
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
schedule();
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
}
|
|
finish_wait(&root->fs_info->transaction_wait, &wait);
|
|
put_transaction(cur_trans);
|
|
}
|
|
}
|
|
|
|
enum btrfs_trans_type {
|
|
TRANS_START,
|
|
TRANS_JOIN,
|
|
TRANS_USERSPACE,
|
|
TRANS_JOIN_NOLOCK,
|
|
};
|
|
|
|
static int may_wait_transaction(struct btrfs_root *root, int type)
|
|
{
|
|
if (!root->fs_info->log_root_recovering &&
|
|
((type == TRANS_START && !root->fs_info->open_ioctl_trans) ||
|
|
type == TRANS_USERSPACE))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
|
|
u64 num_items, int type)
|
|
{
|
|
struct btrfs_trans_handle *h;
|
|
struct btrfs_transaction *cur_trans;
|
|
int ret;
|
|
again:
|
|
h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
|
|
if (!h)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (type != TRANS_JOIN_NOLOCK)
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (may_wait_transaction(root, type))
|
|
wait_current_trans(root);
|
|
|
|
ret = join_transaction(root);
|
|
BUG_ON(ret);
|
|
|
|
cur_trans = root->fs_info->running_transaction;
|
|
cur_trans->use_count++;
|
|
if (type != TRANS_JOIN_NOLOCK)
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
h->transid = cur_trans->transid;
|
|
h->transaction = cur_trans;
|
|
h->blocks_used = 0;
|
|
h->block_group = 0;
|
|
h->bytes_reserved = 0;
|
|
h->delayed_ref_updates = 0;
|
|
h->block_rsv = NULL;
|
|
|
|
smp_mb();
|
|
if (cur_trans->blocked && may_wait_transaction(root, type)) {
|
|
btrfs_commit_transaction(h, root);
|
|
goto again;
|
|
}
|
|
|
|
if (num_items > 0) {
|
|
ret = btrfs_trans_reserve_metadata(h, root, num_items);
|
|
if (ret == -EAGAIN) {
|
|
btrfs_commit_transaction(h, root);
|
|
goto again;
|
|
}
|
|
if (ret < 0) {
|
|
btrfs_end_transaction(h, root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
if (type != TRANS_JOIN_NOLOCK)
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
record_root_in_trans(h, root);
|
|
if (type != TRANS_JOIN_NOLOCK)
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
if (!current->journal_info && type != TRANS_USERSPACE)
|
|
current->journal_info = h;
|
|
return h;
|
|
}
|
|
|
|
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
|
|
int num_items)
|
|
{
|
|
return start_transaction(root, num_items, TRANS_START);
|
|
}
|
|
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
|
|
int num_blocks)
|
|
{
|
|
return start_transaction(root, 0, TRANS_JOIN);
|
|
}
|
|
|
|
struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root,
|
|
int num_blocks)
|
|
{
|
|
return start_transaction(root, 0, TRANS_JOIN_NOLOCK);
|
|
}
|
|
|
|
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
|
|
int num_blocks)
|
|
{
|
|
return start_transaction(r, 0, TRANS_USERSPACE);
|
|
}
|
|
|
|
/* wait for a transaction commit to be fully complete */
|
|
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;
|
|
}
|
|
|
|
int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid)
|
|
{
|
|
struct btrfs_transaction *cur_trans = NULL, *t;
|
|
int ret;
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
ret = 0;
|
|
if (transid) {
|
|
if (transid <= root->fs_info->last_trans_committed)
|
|
goto out_unlock;
|
|
|
|
/* find specified transaction */
|
|
list_for_each_entry(t, &root->fs_info->trans_list, list) {
|
|
if (t->transid == transid) {
|
|
cur_trans = t;
|
|
break;
|
|
}
|
|
if (t->transid > transid)
|
|
break;
|
|
}
|
|
ret = -EINVAL;
|
|
if (!cur_trans)
|
|
goto out_unlock; /* bad transid */
|
|
} else {
|
|
/* find newest transaction that is committing | committed */
|
|
list_for_each_entry_reverse(t, &root->fs_info->trans_list,
|
|
list) {
|
|
if (t->in_commit) {
|
|
if (t->commit_done)
|
|
goto out_unlock;
|
|
cur_trans = t;
|
|
break;
|
|
}
|
|
}
|
|
if (!cur_trans)
|
|
goto out_unlock; /* nothing committing|committed */
|
|
}
|
|
|
|
cur_trans->use_count++;
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
wait_for_commit(root, cur_trans);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
put_transaction(cur_trans);
|
|
ret = 0;
|
|
out_unlock:
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* rate limit against the drop_snapshot code. This helps to slow down new
|
|
* operations if the drop_snapshot code isn't able to keep up.
|
|
*/
|
|
static void throttle_on_drops(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *info = root->fs_info;
|
|
int harder_count = 0;
|
|
|
|
harder:
|
|
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));
|
|
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;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void btrfs_throttle(struct btrfs_root *root)
|
|
{
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (!root->fs_info->open_ioctl_trans)
|
|
wait_current_trans(root);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
}
|
|
|
|
static int should_end_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
ret = btrfs_block_rsv_check(trans, root,
|
|
&root->fs_info->global_block_rsv, 0, 5);
|
|
return ret ? 1 : 0;
|
|
}
|
|
|
|
int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_transaction *cur_trans = trans->transaction;
|
|
int updates;
|
|
|
|
if (cur_trans->blocked || cur_trans->delayed_refs.flushing)
|
|
return 1;
|
|
|
|
updates = trans->delayed_ref_updates;
|
|
trans->delayed_ref_updates = 0;
|
|
if (updates)
|
|
btrfs_run_delayed_refs(trans, root, updates);
|
|
|
|
return should_end_transaction(trans, root);
|
|
}
|
|
|
|
static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int throttle, int lock)
|
|
{
|
|
struct btrfs_transaction *cur_trans = trans->transaction;
|
|
struct btrfs_fs_info *info = root->fs_info;
|
|
int count = 0;
|
|
|
|
while (count < 4) {
|
|
unsigned long cur = trans->delayed_ref_updates;
|
|
trans->delayed_ref_updates = 0;
|
|
if (cur &&
|
|
trans->transaction->delayed_refs.num_heads_ready > 64) {
|
|
trans->delayed_ref_updates = 0;
|
|
|
|
/*
|
|
* do a full flush if the transaction is trying
|
|
* to close
|
|
*/
|
|
if (trans->transaction->delayed_refs.flushing)
|
|
cur = 0;
|
|
btrfs_run_delayed_refs(trans, root, cur);
|
|
} else {
|
|
break;
|
|
}
|
|
count++;
|
|
}
|
|
|
|
btrfs_trans_release_metadata(trans, root);
|
|
|
|
if (lock && !root->fs_info->open_ioctl_trans &&
|
|
should_end_transaction(trans, root))
|
|
trans->transaction->blocked = 1;
|
|
|
|
if (lock && cur_trans->blocked && !cur_trans->in_commit) {
|
|
if (throttle)
|
|
return btrfs_commit_transaction(trans, root);
|
|
else
|
|
wake_up_process(info->transaction_kthread);
|
|
}
|
|
|
|
if (lock)
|
|
mutex_lock(&info->trans_mutex);
|
|
WARN_ON(cur_trans != info->running_transaction);
|
|
WARN_ON(cur_trans->num_writers < 1);
|
|
cur_trans->num_writers--;
|
|
|
|
smp_mb();
|
|
if (waitqueue_active(&cur_trans->writer_wait))
|
|
wake_up(&cur_trans->writer_wait);
|
|
put_transaction(cur_trans);
|
|
if (lock)
|
|
mutex_unlock(&info->trans_mutex);
|
|
|
|
if (current->journal_info == trans)
|
|
current->journal_info = NULL;
|
|
memset(trans, 0, sizeof(*trans));
|
|
kmem_cache_free(btrfs_trans_handle_cachep, trans);
|
|
|
|
if (throttle)
|
|
btrfs_run_delayed_iputs(root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_end_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
return __btrfs_end_transaction(trans, root, 0, 1);
|
|
}
|
|
|
|
int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
return __btrfs_end_transaction(trans, root, 1, 1);
|
|
}
|
|
|
|
int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
return __btrfs_end_transaction(trans, root, 0, 0);
|
|
}
|
|
|
|
/*
|
|
* when btree blocks are allocated, they have some corresponding bits set for
|
|
* them in one of two extent_io trees. This is used to make sure all of
|
|
* those extents are sent to disk but does not wait on them
|
|
*/
|
|
int btrfs_write_marked_extents(struct btrfs_root *root,
|
|
struct extent_io_tree *dirty_pages, int mark)
|
|
{
|
|
int ret;
|
|
int err = 0;
|
|
int werr = 0;
|
|
struct page *page;
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
u64 start = 0;
|
|
u64 end;
|
|
unsigned long index;
|
|
|
|
while (1) {
|
|
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
|
|
mark);
|
|
if (ret)
|
|
break;
|
|
while (start <= end) {
|
|
cond_resched();
|
|
|
|
index = start >> PAGE_CACHE_SHIFT;
|
|
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
|
|
page = find_get_page(btree_inode->i_mapping, index);
|
|
if (!page)
|
|
continue;
|
|
|
|
btree_lock_page_hook(page);
|
|
if (!page->mapping) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
continue;
|
|
}
|
|
|
|
if (PageWriteback(page)) {
|
|
if (PageDirty(page))
|
|
wait_on_page_writeback(page);
|
|
else {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
continue;
|
|
}
|
|
}
|
|
err = write_one_page(page, 0);
|
|
if (err)
|
|
werr = err;
|
|
page_cache_release(page);
|
|
}
|
|
}
|
|
if (err)
|
|
werr = err;
|
|
return werr;
|
|
}
|
|
|
|
/*
|
|
* when btree blocks are allocated, they have some corresponding bits set for
|
|
* them in one of two extent_io trees. This is used to make sure all of
|
|
* those extents are on disk for transaction or log commit. We wait
|
|
* on all the pages and clear them from the dirty pages state tree
|
|
*/
|
|
int btrfs_wait_marked_extents(struct btrfs_root *root,
|
|
struct extent_io_tree *dirty_pages, int mark)
|
|
{
|
|
int ret;
|
|
int err = 0;
|
|
int werr = 0;
|
|
struct page *page;
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
u64 start = 0;
|
|
u64 end;
|
|
unsigned long index;
|
|
|
|
while (1) {
|
|
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
|
|
mark);
|
|
if (ret)
|
|
break;
|
|
|
|
clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
|
|
while (start <= end) {
|
|
index = start >> PAGE_CACHE_SHIFT;
|
|
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
|
|
page = find_get_page(btree_inode->i_mapping, index);
|
|
if (!page)
|
|
continue;
|
|
if (PageDirty(page)) {
|
|
btree_lock_page_hook(page);
|
|
wait_on_page_writeback(page);
|
|
err = write_one_page(page, 0);
|
|
if (err)
|
|
werr = err;
|
|
}
|
|
wait_on_page_writeback(page);
|
|
page_cache_release(page);
|
|
cond_resched();
|
|
}
|
|
}
|
|
if (err)
|
|
werr = err;
|
|
return werr;
|
|
}
|
|
|
|
/*
|
|
* when btree blocks are allocated, they have some corresponding bits set for
|
|
* them in one of two extent_io trees. This is used to make sure all of
|
|
* those extents are on disk for transaction or log commit
|
|
*/
|
|
int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
|
|
struct extent_io_tree *dirty_pages, int mark)
|
|
{
|
|
int ret;
|
|
int ret2;
|
|
|
|
ret = btrfs_write_marked_extents(root, dirty_pages, mark);
|
|
ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark);
|
|
return ret || ret2;
|
|
}
|
|
|
|
int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
if (!trans || !trans->transaction) {
|
|
struct inode *btree_inode;
|
|
btree_inode = root->fs_info->btree_inode;
|
|
return filemap_write_and_wait(btree_inode->i_mapping);
|
|
}
|
|
return btrfs_write_and_wait_marked_extents(root,
|
|
&trans->transaction->dirty_pages,
|
|
EXTENT_DIRTY);
|
|
}
|
|
|
|
/*
|
|
* this is used to update the root pointer in the tree of tree roots.
|
|
*
|
|
* But, in the case of the extent allocation tree, updating the root
|
|
* pointer may allocate blocks which may change the root of the extent
|
|
* allocation tree.
|
|
*
|
|
* So, this loops and repeats and makes sure the cowonly root didn't
|
|
* change while the root pointer was being updated in the metadata.
|
|
*/
|
|
static int update_cowonly_root(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
u64 old_root_bytenr;
|
|
u64 old_root_used;
|
|
struct btrfs_root *tree_root = root->fs_info->tree_root;
|
|
|
|
old_root_used = btrfs_root_used(&root->root_item);
|
|
btrfs_write_dirty_block_groups(trans, root);
|
|
|
|
while (1) {
|
|
old_root_bytenr = btrfs_root_bytenr(&root->root_item);
|
|
if (old_root_bytenr == root->node->start &&
|
|
old_root_used == btrfs_root_used(&root->root_item))
|
|
break;
|
|
|
|
btrfs_set_root_node(&root->root_item, root->node);
|
|
ret = btrfs_update_root(trans, tree_root,
|
|
&root->root_key,
|
|
&root->root_item);
|
|
BUG_ON(ret);
|
|
|
|
old_root_used = btrfs_root_used(&root->root_item);
|
|
ret = btrfs_write_dirty_block_groups(trans, root);
|
|
BUG_ON(ret);
|
|
}
|
|
|
|
if (root != root->fs_info->extent_root)
|
|
switch_commit_root(root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* update all the cowonly tree roots on disk
|
|
*/
|
|
static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct list_head *next;
|
|
struct extent_buffer *eb;
|
|
int ret;
|
|
|
|
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
|
|
BUG_ON(ret);
|
|
|
|
eb = btrfs_lock_root_node(fs_info->tree_root);
|
|
btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
|
|
btrfs_tree_unlock(eb);
|
|
free_extent_buffer(eb);
|
|
|
|
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
|
|
BUG_ON(ret);
|
|
|
|
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);
|
|
}
|
|
|
|
down_write(&fs_info->extent_commit_sem);
|
|
switch_commit_root(fs_info->extent_root);
|
|
up_write(&fs_info->extent_commit_sem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dead roots are old snapshots that need to be deleted. This allocates
|
|
* a dirty root struct and adds it into the list of dead roots that need to
|
|
* be deleted
|
|
*/
|
|
int btrfs_add_dead_root(struct btrfs_root *root)
|
|
{
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
list_add(&root->root_list, &root->fs_info->dead_roots);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* update all the cowonly tree roots on disk
|
|
*/
|
|
static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_root *gang[8];
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int i;
|
|
int ret;
|
|
int err = 0;
|
|
|
|
while (1) {
|
|
ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix,
|
|
(void **)gang, 0,
|
|
ARRAY_SIZE(gang),
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
if (ret == 0)
|
|
break;
|
|
for (i = 0; i < ret; i++) {
|
|
root = gang[i];
|
|
radix_tree_tag_clear(&fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid,
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
|
|
btrfs_free_log(trans, root);
|
|
btrfs_update_reloc_root(trans, root);
|
|
btrfs_orphan_commit_root(trans, root);
|
|
|
|
if (root->commit_root != root->node) {
|
|
switch_commit_root(root);
|
|
btrfs_set_root_node(&root->root_item,
|
|
root->node);
|
|
}
|
|
|
|
err = btrfs_update_root(trans, fs_info->tree_root,
|
|
&root->root_key,
|
|
&root->root_item);
|
|
if (err)
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* defrag a given btree. If cacheonly == 1, this won't read from the disk,
|
|
* otherwise every leaf in the btree is read and defragged.
|
|
*/
|
|
int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
|
|
{
|
|
struct btrfs_fs_info *info = root->fs_info;
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
unsigned long nr;
|
|
|
|
if (xchg(&root->defrag_running, 1))
|
|
return 0;
|
|
|
|
while (1) {
|
|
trans = btrfs_start_transaction(root, 0);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = btrfs_defrag_leaves(trans, root, cacheonly);
|
|
|
|
nr = trans->blocks_used;
|
|
btrfs_end_transaction(trans, root);
|
|
btrfs_btree_balance_dirty(info->tree_root, nr);
|
|
cond_resched();
|
|
|
|
if (root->fs_info->closing || ret != -EAGAIN)
|
|
break;
|
|
}
|
|
root->defrag_running = 0;
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* when dropping snapshots, we generate a ton of delayed refs, and it makes
|
|
* sense not to join the transaction while it is trying to flush the current
|
|
* queue of delayed refs out.
|
|
*
|
|
* This is used by the drop snapshot code only
|
|
*/
|
|
static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
mutex_lock(&info->trans_mutex);
|
|
while (info->running_transaction &&
|
|
info->running_transaction->delayed_refs.flushing) {
|
|
prepare_to_wait(&info->transaction_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
mutex_unlock(&info->trans_mutex);
|
|
|
|
schedule();
|
|
|
|
mutex_lock(&info->trans_mutex);
|
|
finish_wait(&info->transaction_wait, &wait);
|
|
}
|
|
mutex_unlock(&info->trans_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Given a list of roots that need to be deleted, call btrfs_drop_snapshot on
|
|
* all of them
|
|
*/
|
|
int btrfs_drop_dead_root(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *tree_root = root->fs_info->tree_root;
|
|
unsigned long nr;
|
|
int ret;
|
|
|
|
while (1) {
|
|
/*
|
|
* we don't want to jump in and create a bunch of
|
|
* delayed refs if the transaction is starting to close
|
|
*/
|
|
wait_transaction_pre_flush(tree_root->fs_info);
|
|
trans = btrfs_start_transaction(tree_root, 1);
|
|
|
|
/*
|
|
* we've joined a transaction, make sure it isn't
|
|
* closing right now
|
|
*/
|
|
if (trans->transaction->delayed_refs.flushing) {
|
|
btrfs_end_transaction(trans, tree_root);
|
|
continue;
|
|
}
|
|
|
|
ret = btrfs_drop_snapshot(trans, root);
|
|
if (ret != -EAGAIN)
|
|
break;
|
|
|
|
ret = btrfs_update_root(trans, tree_root,
|
|
&root->root_key,
|
|
&root->root_item);
|
|
if (ret)
|
|
break;
|
|
|
|
nr = trans->blocks_used;
|
|
ret = btrfs_end_transaction(trans, tree_root);
|
|
BUG_ON(ret);
|
|
|
|
btrfs_btree_balance_dirty(tree_root, nr);
|
|
cond_resched();
|
|
}
|
|
BUG_ON(ret);
|
|
|
|
ret = btrfs_del_root(trans, tree_root, &root->root_key);
|
|
BUG_ON(ret);
|
|
|
|
nr = trans->blocks_used;
|
|
ret = btrfs_end_transaction(trans, tree_root);
|
|
BUG_ON(ret);
|
|
|
|
free_extent_buffer(root->node);
|
|
free_extent_buffer(root->commit_root);
|
|
kfree(root);
|
|
|
|
btrfs_btree_balance_dirty(tree_root, nr);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* new snapshots need to be created at a very specific time in the
|
|
* transaction commit. This does the actual creation
|
|
*/
|
|
static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_pending_snapshot *pending)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_root_item *new_root_item;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root = pending->root;
|
|
struct btrfs_root *parent_root;
|
|
struct inode *parent_inode;
|
|
struct dentry *dentry;
|
|
struct extent_buffer *tmp;
|
|
struct extent_buffer *old;
|
|
int ret;
|
|
u64 to_reserve = 0;
|
|
u64 index = 0;
|
|
u64 objectid;
|
|
|
|
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
|
|
if (!new_root_item) {
|
|
pending->error = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid);
|
|
if (ret) {
|
|
pending->error = ret;
|
|
goto fail;
|
|
}
|
|
|
|
btrfs_reloc_pre_snapshot(trans, pending, &to_reserve);
|
|
btrfs_orphan_pre_snapshot(trans, pending, &to_reserve);
|
|
|
|
if (to_reserve > 0) {
|
|
ret = btrfs_block_rsv_add(trans, root, &pending->block_rsv,
|
|
to_reserve);
|
|
if (ret) {
|
|
pending->error = ret;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
key.objectid = objectid;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
|
|
trans->block_rsv = &pending->block_rsv;
|
|
|
|
dentry = pending->dentry;
|
|
parent_inode = dentry->d_parent->d_inode;
|
|
parent_root = BTRFS_I(parent_inode)->root;
|
|
record_root_in_trans(trans, parent_root);
|
|
|
|
/*
|
|
* insert the directory item
|
|
*/
|
|
ret = btrfs_set_inode_index(parent_inode, &index);
|
|
BUG_ON(ret);
|
|
ret = btrfs_insert_dir_item(trans, parent_root,
|
|
dentry->d_name.name, dentry->d_name.len,
|
|
parent_inode->i_ino, &key,
|
|
BTRFS_FT_DIR, index);
|
|
BUG_ON(ret);
|
|
|
|
btrfs_i_size_write(parent_inode, parent_inode->i_size +
|
|
dentry->d_name.len * 2);
|
|
ret = btrfs_update_inode(trans, parent_root, parent_inode);
|
|
BUG_ON(ret);
|
|
|
|
record_root_in_trans(trans, root);
|
|
btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
|
|
memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
|
|
|
|
old = btrfs_lock_root_node(root);
|
|
btrfs_cow_block(trans, root, old, NULL, 0, &old);
|
|
btrfs_set_lock_blocking(old);
|
|
|
|
btrfs_copy_root(trans, root, old, &tmp, objectid);
|
|
btrfs_tree_unlock(old);
|
|
free_extent_buffer(old);
|
|
|
|
btrfs_set_root_node(new_root_item, tmp);
|
|
/* record when the snapshot was created in key.offset */
|
|
key.offset = trans->transid;
|
|
ret = btrfs_insert_root(trans, tree_root, &key, new_root_item);
|
|
btrfs_tree_unlock(tmp);
|
|
free_extent_buffer(tmp);
|
|
BUG_ON(ret);
|
|
|
|
/*
|
|
* insert root back/forward references
|
|
*/
|
|
ret = btrfs_add_root_ref(trans, tree_root, objectid,
|
|
parent_root->root_key.objectid,
|
|
parent_inode->i_ino, index,
|
|
dentry->d_name.name, dentry->d_name.len);
|
|
BUG_ON(ret);
|
|
|
|
key.offset = (u64)-1;
|
|
pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key);
|
|
BUG_ON(IS_ERR(pending->snap));
|
|
|
|
btrfs_reloc_post_snapshot(trans, pending);
|
|
btrfs_orphan_post_snapshot(trans, pending);
|
|
fail:
|
|
kfree(new_root_item);
|
|
btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* create all the snapshots we've scheduled for creation
|
|
*/
|
|
static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_pending_snapshot *pending;
|
|
struct list_head *head = &trans->transaction->pending_snapshots;
|
|
int ret;
|
|
|
|
list_for_each_entry(pending, head, list) {
|
|
ret = create_pending_snapshot(trans, fs_info, pending);
|
|
BUG_ON(ret);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void update_super_roots(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_root_item *root_item;
|
|
struct btrfs_super_block *super;
|
|
|
|
super = &root->fs_info->super_copy;
|
|
|
|
root_item = &root->fs_info->chunk_root->root_item;
|
|
super->chunk_root = root_item->bytenr;
|
|
super->chunk_root_generation = root_item->generation;
|
|
super->chunk_root_level = root_item->level;
|
|
|
|
root_item = &root->fs_info->tree_root->root_item;
|
|
super->root = root_item->bytenr;
|
|
super->generation = root_item->generation;
|
|
super->root_level = root_item->level;
|
|
if (super->cache_generation != 0 || btrfs_test_opt(root, SPACE_CACHE))
|
|
super->cache_generation = root_item->generation;
|
|
}
|
|
|
|
int btrfs_transaction_in_commit(struct btrfs_fs_info *info)
|
|
{
|
|
int ret = 0;
|
|
spin_lock(&info->new_trans_lock);
|
|
if (info->running_transaction)
|
|
ret = info->running_transaction->in_commit;
|
|
spin_unlock(&info->new_trans_lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_transaction_blocked(struct btrfs_fs_info *info)
|
|
{
|
|
int ret = 0;
|
|
spin_lock(&info->new_trans_lock);
|
|
if (info->running_transaction)
|
|
ret = info->running_transaction->blocked;
|
|
spin_unlock(&info->new_trans_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* wait for the current transaction commit to start and block subsequent
|
|
* transaction joins
|
|
*/
|
|
static void wait_current_trans_commit_start(struct btrfs_root *root,
|
|
struct btrfs_transaction *trans)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (trans->in_commit)
|
|
return;
|
|
|
|
while (1) {
|
|
prepare_to_wait(&root->fs_info->transaction_blocked_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (trans->in_commit) {
|
|
finish_wait(&root->fs_info->transaction_blocked_wait,
|
|
&wait);
|
|
break;
|
|
}
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
schedule();
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
finish_wait(&root->fs_info->transaction_blocked_wait, &wait);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* wait for the current transaction to start and then become unblocked.
|
|
* caller holds ref.
|
|
*/
|
|
static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root,
|
|
struct btrfs_transaction *trans)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (trans->commit_done || (trans->in_commit && !trans->blocked))
|
|
return;
|
|
|
|
while (1) {
|
|
prepare_to_wait(&root->fs_info->transaction_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (trans->commit_done ||
|
|
(trans->in_commit && !trans->blocked)) {
|
|
finish_wait(&root->fs_info->transaction_wait,
|
|
&wait);
|
|
break;
|
|
}
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
schedule();
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
finish_wait(&root->fs_info->transaction_wait,
|
|
&wait);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* commit transactions asynchronously. once btrfs_commit_transaction_async
|
|
* returns, any subsequent transaction will not be allowed to join.
|
|
*/
|
|
struct btrfs_async_commit {
|
|
struct btrfs_trans_handle *newtrans;
|
|
struct btrfs_root *root;
|
|
struct delayed_work work;
|
|
};
|
|
|
|
static void do_async_commit(struct work_struct *work)
|
|
{
|
|
struct btrfs_async_commit *ac =
|
|
container_of(work, struct btrfs_async_commit, work.work);
|
|
|
|
btrfs_commit_transaction(ac->newtrans, ac->root);
|
|
kfree(ac);
|
|
}
|
|
|
|
int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
int wait_for_unblock)
|
|
{
|
|
struct btrfs_async_commit *ac;
|
|
struct btrfs_transaction *cur_trans;
|
|
|
|
ac = kmalloc(sizeof(*ac), GFP_NOFS);
|
|
BUG_ON(!ac);
|
|
|
|
INIT_DELAYED_WORK(&ac->work, do_async_commit);
|
|
ac->root = root;
|
|
ac->newtrans = btrfs_join_transaction(root, 0);
|
|
|
|
/* take transaction reference */
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
cur_trans = trans->transaction;
|
|
cur_trans->use_count++;
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
btrfs_end_transaction(trans, root);
|
|
schedule_delayed_work(&ac->work, 0);
|
|
|
|
/* wait for transaction to start and unblock */
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (wait_for_unblock)
|
|
wait_current_trans_commit_start_and_unblock(root, cur_trans);
|
|
else
|
|
wait_current_trans_commit_start(root, cur_trans);
|
|
put_transaction(cur_trans);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* btrfs_transaction state sequence:
|
|
* in_commit = 0, blocked = 0 (initial)
|
|
* in_commit = 1, blocked = 1
|
|
* blocked = 0
|
|
* commit_done = 1
|
|
*/
|
|
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
unsigned long joined = 0;
|
|
struct btrfs_transaction *cur_trans;
|
|
struct btrfs_transaction *prev_trans = NULL;
|
|
DEFINE_WAIT(wait);
|
|
int ret;
|
|
int should_grow = 0;
|
|
unsigned long now = get_seconds();
|
|
int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT);
|
|
|
|
btrfs_run_ordered_operations(root, 0);
|
|
|
|
/* make a pass through all the delayed refs we have so far
|
|
* any runnings procs may add more while we are here
|
|
*/
|
|
ret = btrfs_run_delayed_refs(trans, root, 0);
|
|
BUG_ON(ret);
|
|
|
|
btrfs_trans_release_metadata(trans, root);
|
|
|
|
cur_trans = trans->transaction;
|
|
/*
|
|
* set the flushing flag so procs in this transaction have to
|
|
* start sending their work down.
|
|
*/
|
|
cur_trans->delayed_refs.flushing = 1;
|
|
|
|
ret = btrfs_run_delayed_refs(trans, root, 0);
|
|
BUG_ON(ret);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (cur_trans->in_commit) {
|
|
cur_trans->use_count++;
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
btrfs_end_transaction(trans, root);
|
|
|
|
ret = wait_for_commit(root, cur_trans);
|
|
BUG_ON(ret);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
put_transaction(cur_trans);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
trans->transaction->in_commit = 1;
|
|
trans->transaction->blocked = 1;
|
|
wake_up(&root->fs_info->transaction_blocked_wait);
|
|
|
|
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);
|
|
put_transaction(prev_trans);
|
|
}
|
|
}
|
|
|
|
if (now < cur_trans->start_time || now - cur_trans->start_time < 1)
|
|
should_grow = 1;
|
|
|
|
do {
|
|
int snap_pending = 0;
|
|
joined = cur_trans->num_joined;
|
|
if (!list_empty(&trans->transaction->pending_snapshots))
|
|
snap_pending = 1;
|
|
|
|
WARN_ON(cur_trans != trans->transaction);
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
if (flush_on_commit || snap_pending) {
|
|
btrfs_start_delalloc_inodes(root, 1);
|
|
ret = btrfs_wait_ordered_extents(root, 0, 1);
|
|
BUG_ON(ret);
|
|
}
|
|
|
|
/*
|
|
* rename don't use btrfs_join_transaction, so, once we
|
|
* set the transaction to blocked above, we aren't going
|
|
* to get any new ordered operations. We can safely run
|
|
* it here and no for sure that nothing new will be added
|
|
* to the list
|
|
*/
|
|
btrfs_run_ordered_operations(root, 1);
|
|
|
|
prepare_to_wait(&cur_trans->writer_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
|
|
smp_mb();
|
|
if (cur_trans->num_writers > 1)
|
|
schedule_timeout(MAX_SCHEDULE_TIMEOUT);
|
|
else if (should_grow)
|
|
schedule_timeout(1);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
finish_wait(&cur_trans->writer_wait, &wait);
|
|
} while (cur_trans->num_writers > 1 ||
|
|
(should_grow && cur_trans->num_joined != joined));
|
|
|
|
ret = create_pending_snapshots(trans, root->fs_info);
|
|
BUG_ON(ret);
|
|
|
|
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
|
|
BUG_ON(ret);
|
|
|
|
WARN_ON(cur_trans != trans->transaction);
|
|
|
|
/* btrfs_commit_tree_roots is responsible for getting the
|
|
* various roots consistent with each other. Every pointer
|
|
* in the tree of tree roots has to point to the most up to date
|
|
* root for every subvolume and other tree. So, we have to keep
|
|
* the tree logging code from jumping in and changing any
|
|
* of the trees.
|
|
*
|
|
* At this point in the commit, there can't be any tree-log
|
|
* writers, but a little lower down we drop the trans mutex
|
|
* and let new people in. By holding the tree_log_mutex
|
|
* from now until after the super is written, we avoid races
|
|
* with the tree-log code.
|
|
*/
|
|
mutex_lock(&root->fs_info->tree_log_mutex);
|
|
|
|
ret = commit_fs_roots(trans, root);
|
|
BUG_ON(ret);
|
|
|
|
/* commit_fs_roots gets rid of all the tree log roots, it is now
|
|
* safe to free the root of tree log roots
|
|
*/
|
|
btrfs_free_log_root_tree(trans, root->fs_info);
|
|
|
|
ret = commit_cowonly_roots(trans, root);
|
|
BUG_ON(ret);
|
|
|
|
btrfs_prepare_extent_commit(trans, root);
|
|
|
|
cur_trans = root->fs_info->running_transaction;
|
|
spin_lock(&root->fs_info->new_trans_lock);
|
|
root->fs_info->running_transaction = NULL;
|
|
spin_unlock(&root->fs_info->new_trans_lock);
|
|
|
|
btrfs_set_root_node(&root->fs_info->tree_root->root_item,
|
|
root->fs_info->tree_root->node);
|
|
switch_commit_root(root->fs_info->tree_root);
|
|
|
|
btrfs_set_root_node(&root->fs_info->chunk_root->root_item,
|
|
root->fs_info->chunk_root->node);
|
|
switch_commit_root(root->fs_info->chunk_root);
|
|
|
|
update_super_roots(root);
|
|
|
|
if (!root->fs_info->log_root_recovering) {
|
|
btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
|
|
btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0);
|
|
}
|
|
|
|
memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
|
|
sizeof(root->fs_info->super_copy));
|
|
|
|
trans->transaction->blocked = 0;
|
|
|
|
wake_up(&root->fs_info->transaction_wait);
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
ret = btrfs_write_and_wait_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
write_ctree_super(trans, root, 0);
|
|
|
|
/*
|
|
* the super is written, we can safely allow the tree-loggers
|
|
* to go about their business
|
|
*/
|
|
mutex_unlock(&root->fs_info->tree_log_mutex);
|
|
|
|
btrfs_finish_extent_commit(trans, root);
|
|
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
|
|
cur_trans->commit_done = 1;
|
|
|
|
root->fs_info->last_trans_committed = cur_trans->transid;
|
|
|
|
wake_up(&cur_trans->commit_wait);
|
|
|
|
put_transaction(cur_trans);
|
|
put_transaction(cur_trans);
|
|
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
if (current->journal_info == trans)
|
|
current->journal_info = NULL;
|
|
|
|
kmem_cache_free(btrfs_trans_handle_cachep, trans);
|
|
|
|
if (current != root->fs_info->transaction_kthread)
|
|
btrfs_run_delayed_iputs(root);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* interface function to delete all the snapshots we have scheduled for deletion
|
|
*/
|
|
int btrfs_clean_old_snapshots(struct btrfs_root *root)
|
|
{
|
|
LIST_HEAD(list);
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
mutex_lock(&fs_info->trans_mutex);
|
|
list_splice_init(&fs_info->dead_roots, &list);
|
|
mutex_unlock(&fs_info->trans_mutex);
|
|
|
|
while (!list_empty(&list)) {
|
|
root = list_entry(list.next, struct btrfs_root, root_list);
|
|
list_del(&root->root_list);
|
|
|
|
if (btrfs_header_backref_rev(root->node) <
|
|
BTRFS_MIXED_BACKREF_REV)
|
|
btrfs_drop_snapshot(root, NULL, 0);
|
|
else
|
|
btrfs_drop_snapshot(root, NULL, 1);
|
|
}
|
|
return 0;
|
|
}
|