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Btrfs: split the global ordered extents mutex 

When we create a snapshot, we just need wait the ordered extents in
the source fs/file root, but because we use the global mutex to protect
this ordered extents list of the source fs/file root to avoid accessing
a empty list, if someone got the mutex to access the ordered extents list
of the other fs/file root, we had to wait.

This patch splits the above global mutex, now every fs/file root has
its own mutex to protect its own 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 2014-03-06 13:55:02 +08:00 committed by Josef Bacik
parent 6c255e67ce
commit 31f3d255c6
3 changed files with 7 additions and 13 deletions
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2
fs/btrfs/ctree.h
View File

@ -1814,6 +1814,8 @@ struct btrfs_root {
struct list_head delalloc_inodes;
struct list_head delalloc_root;
u64 nr_delalloc_inodes;
struct mutex ordered_extent_mutex;
/*
* this is used by the balancing code to wait for all the pending
* ordered extents

1
fs/btrfs/disk-io.c
View File

@ -1220,6 +1220,7 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
spin_lock_init(&root->log_extents_lock[1]);
mutex_init(&root->objectid_mutex);
mutex_init(&root->log_mutex);
mutex_init(&root->ordered_extent_mutex);
init_waitqueue_head(&root->log_writer_wait);
init_waitqueue_head(&root->log_commit_wait[0]);
init_waitqueue_head(&root->log_commit_wait[1]);

17
fs/btrfs/ordered-data.c
View File

@ -595,7 +595,7 @@ static void btrfs_run_ordered_extent_work(struct btrfs_work *work)
* wait for all the ordered extents in a root. This is done when balancing
* space between drives.
*/
static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)
int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)
{
struct list_head splice, works;
struct btrfs_ordered_extent *ordered, *next;
@ -604,6 +604,7 @@ static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)
INIT_LIST_HEAD(&splice);
INIT_LIST_HEAD(&works);
mutex_lock(&root->ordered_extent_mutex);
spin_lock(&root->ordered_extent_lock);
list_splice_init(&root->ordered_extents, &splice);
while (!list_empty(&splice) && nr) {
@ -635,17 +636,7 @@ static int __btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)
btrfs_put_ordered_extent(ordered);
cond_resched();
}
return count;
}
int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr)
{
int count;
mutex_lock(&root->fs_info->ordered_operations_mutex);
count = __btrfs_wait_ordered_extents(root, nr);
mutex_unlock(&root->fs_info->ordered_operations_mutex);
mutex_unlock(&root->ordered_extent_mutex);
return count;
}
@ -670,7 +661,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr)
&fs_info->ordered_roots);
spin_unlock(&fs_info->ordered_root_lock);
done = __btrfs_wait_ordered_extents(root, nr);
done = btrfs_wait_ordered_extents(root, nr);
btrfs_put_fs_root(root);
spin_lock(&fs_info->ordered_root_lock);