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Btrfs: don't mix the ordered extents of all files together during logging the inodes

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There was a problem in the old code:
If we failed to log the csum, we would free all the ordered extents in the log list
including those ordered extents that were logged successfully, it would make the
log committer not to wait for the completion of the ordered extents.

This patch doesn't insert the ordered extents that is about to be logged into
a global list, instead, we insert them into a local list. If we log the ordered
extents successfully, we splice them with the global list, or we will throw them
away, then do full sync. It can also reduce the lock contention and the traverse
time of list.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Miao Xie 2014-01-14 20:31:51 +08:00 • committed by Josef Bacik
parent 93de4ba864
commit 827463c49f
3 changed files with 49 additions and 35 deletions
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37
fs/btrfs/ordered-data.c
View file

@ -424,27 +424,48 @@ out:
}
/* Needs to either be called under a log transaction or the log_mutex */
void btrfs_get_logged_extents(struct btrfs_root *log, struct inode *inode)
void btrfs_get_logged_extents(struct inode *inode,
struct list_head *logged_list)
{
struct btrfs_ordered_inode_tree *tree;
struct btrfs_ordered_extent *ordered;
struct rb_node *n;
int index = log->log_transid % 2;
tree = &BTRFS_I(inode)->ordered_tree;
spin_lock_irq(&tree->lock);
for (n = rb_first(&tree->tree); n; n = rb_next(n)) {
ordered = rb_entry(n, struct btrfs_ordered_extent, rb_node);
spin_lock(&log->log_extents_lock[index]);
if (list_empty(&ordered->log_list)) {
list_add_tail(&ordered->log_list, &log->logged_list[index]);
atomic_inc(&ordered->refs);
}
spin_unlock(&log->log_extents_lock[index]);
if (!list_empty(&ordered->log_list))
continue;
list_add_tail(&ordered->log_list, logged_list);
atomic_inc(&ordered->refs);
}
spin_unlock_irq(&tree->lock);
}
void btrfs_put_logged_extents(struct list_head *logged_list)
{
struct btrfs_ordered_extent *ordered;
while (!list_empty(logged_list)) {
ordered = list_first_entry(logged_list,
struct btrfs_ordered_extent,
log_list);
list_del_init(&ordered->log_list);
btrfs_put_ordered_extent(ordered);
}
}
void btrfs_submit_logged_extents(struct list_head *logged_list,
struct btrfs_root *log)
{
int index = log->log_transid % 2;
spin_lock_irq(&log->log_extents_lock[index]);
list_splice_tail(logged_list, &log->logged_list[index]);
spin_unlock_irq(&log->log_extents_lock[index]);
}
void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid)
{
struct btrfs_ordered_extent *ordered;