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 <mi...@cn.fujitsu.com>
---
Changelog v1 -> v2:
- New patch.
---
fs/btrfs/ctree.h | 2 ++
fs/btrfs/disk-io.c | 1 +
fs/btrfs/ordered-data.c | 17 ++++-------------
3 files changed, 7 insertions(+), 13 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2f3949b..7bae97e 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1806,6 +1806,8 @@ 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
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index de6a48f..65fe26e 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1197,6 +1197,7 @@ 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]);
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 067e129..2849485 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -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) {
@@ -634,17 +635,7 @@ 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;
}
@@ -669,7 +660,7 @@ 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);
--
1.8.1.4
--
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