Skip to content
This repository has been archived by the owner on Dec 20, 2023. It is now read-only.

Commit

Permalink
Btrfs: make sure logged extents complete in the current transaction V3
Browse files Browse the repository at this point in the history
Liu Bo pointed out that my previous fix would lose the generation update in the
scenario I described.  It is actually much worse than that, we could lose the
entire extent if we lose power right after the transaction commits.  Consider
the following

write extent 0-4k
log extent in log tree
commit transaction
	< power fail happens here
ordered extent completes

We would lose the 0-4k extent because it hasn't updated the actual fs tree, and
the transaction commit will reset the log so it isn't replayed.  If we lose
power before the transaction commit we are save, otherwise we are not.

Fix this by keeping track of all extents we logged in this transaction.  Then
when we go to commit the transaction make sure we wait for all of those ordered
extents to complete before proceeding.  This will make sure that if we lose
power after the transaction commit we still have our data.  This also fixes the
problem of the improperly updated extent generation.  Thanks,

cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
  • Loading branch information
Josef Bacik authored and masoncl committed Nov 21, 2014
1 parent 9dba8cf commit 50d9aa9
Show file tree
Hide file tree
Showing 6 changed files with 72 additions and 6 deletions.
20 changes: 20 additions & 0 deletions fs/btrfs/disk-io.c
Original file line number Diff line number Diff line change
Expand Up @@ -4129,6 +4129,25 @@ static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
return 0;
}

static void btrfs_free_pending_ordered(struct btrfs_transaction *cur_trans,
struct btrfs_fs_info *fs_info)
{
struct btrfs_ordered_extent *ordered;

spin_lock(&fs_info->trans_lock);
while (!list_empty(&cur_trans->pending_ordered)) {
ordered = list_first_entry(&cur_trans->pending_ordered,
struct btrfs_ordered_extent,
trans_list);
list_del_init(&ordered->trans_list);
spin_unlock(&fs_info->trans_lock);

btrfs_put_ordered_extent(ordered);
spin_lock(&fs_info->trans_lock);
}
spin_unlock(&fs_info->trans_lock);
}

void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
struct btrfs_root *root)
{
Expand All @@ -4140,6 +4159,7 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
cur_trans->state = TRANS_STATE_UNBLOCKED;
wake_up(&root->fs_info->transaction_wait);

btrfs_free_pending_ordered(cur_trans, root->fs_info);
btrfs_destroy_delayed_inodes(root);
btrfs_assert_delayed_root_empty(root);

Expand Down
9 changes: 7 additions & 2 deletions fs/btrfs/ordered-data.c
Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,7 @@ static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
INIT_LIST_HEAD(&entry->work_list);
init_completion(&entry->completion);
INIT_LIST_HEAD(&entry->log_list);
INIT_LIST_HEAD(&entry->trans_list);

trace_btrfs_ordered_extent_add(inode, entry);

Expand Down Expand Up @@ -443,6 +444,8 @@ void btrfs_get_logged_extents(struct inode *inode,
ordered = rb_entry(n, struct btrfs_ordered_extent, rb_node);
if (!list_empty(&ordered->log_list))
continue;
if (test_bit(BTRFS_ORDERED_LOGGED, &ordered->flags))
continue;
list_add_tail(&ordered->log_list, logged_list);
atomic_inc(&ordered->refs);
}
Expand Down Expand Up @@ -472,7 +475,8 @@ void btrfs_submit_logged_extents(struct list_head *logged_list,
spin_unlock_irq(&log->log_extents_lock[index]);
}

void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid)
void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *log, u64 transid)
{
struct btrfs_ordered_extent *ordered;
int index = transid % 2;
Expand All @@ -497,7 +501,8 @@ void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid)
wait_event(ordered->wait, test_bit(BTRFS_ORDERED_IO_DONE,
&ordered->flags));

btrfs_put_ordered_extent(ordered);
if (!test_and_set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags))
list_add_tail(&ordered->trans_list, &trans->ordered);
spin_lock_irq(&log->log_extents_lock[index]);
}
spin_unlock_irq(&log->log_extents_lock[index]);
Expand Down
8 changes: 7 additions & 1 deletion fs/btrfs/ordered-data.h
Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,8 @@ struct btrfs_ordered_sum {
ordered extent */
#define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */

#define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
* in the logging code. */
struct btrfs_ordered_extent {
/* logical offset in the file */
u64 file_offset;
Expand Down Expand Up @@ -121,6 +123,9 @@ struct btrfs_ordered_extent {
/* If we need to wait on this to be done */
struct list_head log_list;

/* If the transaction needs to wait on this ordered extent */
struct list_head trans_list;

/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
wait_queue_head_t wait;

Expand Down Expand Up @@ -197,7 +202,8 @@ void btrfs_get_logged_extents(struct inode *inode,
void btrfs_put_logged_extents(struct list_head *logged_list);
void btrfs_submit_logged_extents(struct list_head *logged_list,
struct btrfs_root *log);
void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid);
void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *log, u64 transid);
void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
int __init ordered_data_init(void);
void ordered_data_exit(void);
Expand Down
33 changes: 33 additions & 0 deletions fs/btrfs/transaction.c
Original file line number Diff line number Diff line change
Expand Up @@ -247,6 +247,7 @@ static noinline int join_transaction(struct btrfs_root *root, unsigned int type)
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
INIT_LIST_HEAD(&cur_trans->pending_chunks);
INIT_LIST_HEAD(&cur_trans->switch_commits);
INIT_LIST_HEAD(&cur_trans->pending_ordered);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(&cur_trans->dirty_pages,
fs_info->btree_inode->i_mapping);
Expand Down Expand Up @@ -515,6 +516,7 @@ start_transaction(struct btrfs_root *root, u64 num_items, unsigned int type,
h->sync = false;
INIT_LIST_HEAD(&h->qgroup_ref_list);
INIT_LIST_HEAD(&h->new_bgs);
INIT_LIST_HEAD(&h->ordered);

smp_mb();
if (cur_trans->state >= TRANS_STATE_BLOCKED &&
Expand Down Expand Up @@ -746,6 +748,12 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
if (!list_empty(&trans->new_bgs))
btrfs_create_pending_block_groups(trans, root);

if (!list_empty(&trans->ordered)) {
spin_lock(&info->trans_lock);
list_splice(&trans->ordered, &cur_trans->pending_ordered);
spin_unlock(&info->trans_lock);
}

trans->delayed_ref_updates = 0;
if (!trans->sync) {
must_run_delayed_refs =
Expand Down Expand Up @@ -1715,6 +1723,28 @@ static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info)
btrfs_wait_ordered_roots(fs_info, -1);
}

static inline void
btrfs_wait_pending_ordered(struct btrfs_transaction *cur_trans,
struct btrfs_fs_info *fs_info)
{
struct btrfs_ordered_extent *ordered;

spin_lock(&fs_info->trans_lock);
while (!list_empty(&cur_trans->pending_ordered)) {
ordered = list_first_entry(&cur_trans->pending_ordered,
struct btrfs_ordered_extent,
trans_list);
list_del_init(&ordered->trans_list);
spin_unlock(&fs_info->trans_lock);

wait_event(ordered->wait, test_bit(BTRFS_ORDERED_COMPLETE,
&ordered->flags));
btrfs_put_ordered_extent(ordered);
spin_lock(&fs_info->trans_lock);
}
spin_unlock(&fs_info->trans_lock);
}

int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
Expand Down Expand Up @@ -1765,6 +1795,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
}

spin_lock(&root->fs_info->trans_lock);
list_splice(&trans->ordered, &cur_trans->pending_ordered);
if (cur_trans->state >= TRANS_STATE_COMMIT_START) {
spin_unlock(&root->fs_info->trans_lock);
atomic_inc(&cur_trans->use_count);
Expand Down Expand Up @@ -1817,6 +1848,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,

btrfs_wait_delalloc_flush(root->fs_info);

btrfs_wait_pending_ordered(cur_trans, root->fs_info);

btrfs_scrub_pause(root);
/*
* Ok now we need to make sure to block out any other joins while we
Expand Down
2 changes: 2 additions & 0 deletions fs/btrfs/transaction.h
Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,7 @@ struct btrfs_transaction {
wait_queue_head_t commit_wait;
struct list_head pending_snapshots;
struct list_head pending_chunks;
struct list_head pending_ordered;
struct list_head switch_commits;
struct btrfs_delayed_ref_root delayed_refs;
int aborted;
Expand Down Expand Up @@ -105,6 +106,7 @@ struct btrfs_trans_handle {
*/
struct btrfs_root *root;
struct seq_list delayed_ref_elem;
struct list_head ordered;
struct list_head qgroup_ref_list;
struct list_head new_bgs;
};
Expand Down
6 changes: 3 additions & 3 deletions fs/btrfs/tree-log.c
Original file line number Diff line number Diff line change
Expand Up @@ -2600,7 +2600,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
if (atomic_read(&log_root_tree->log_commit[index2])) {
blk_finish_plug(&plug);
btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark);
btrfs_wait_logged_extents(log, log_transid);
btrfs_wait_logged_extents(trans, log, log_transid);
wait_log_commit(trans, log_root_tree,
root_log_ctx.log_transid);
mutex_unlock(&log_root_tree->log_mutex);
Expand Down Expand Up @@ -2645,7 +2645,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
btrfs_wait_marked_extents(log_root_tree,
&log_root_tree->dirty_log_pages,
EXTENT_NEW | EXTENT_DIRTY);
btrfs_wait_logged_extents(log, log_transid);
btrfs_wait_logged_extents(trans, log, log_transid);

btrfs_set_super_log_root(root->fs_info->super_for_commit,
log_root_tree->node->start);
Expand Down Expand Up @@ -3766,7 +3766,7 @@ static int log_one_extent(struct btrfs_trans_handle *trans,
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);

btrfs_set_token_file_extent_generation(leaf, fi, em->generation,
btrfs_set_token_file_extent_generation(leaf, fi, trans->transid,
&token);
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
btrfs_set_token_file_extent_type(leaf, fi,
Expand Down

0 comments on commit 50d9aa9

Please sign in to comment.