We already have fs_info->chunk_mutex to avoid concurrent
chunk creation.
Signed-off-by: Yan Zheng <zheng....@oracle.com>
---
diff -urp 2/fs/btrfs/ctree.h 3/fs/btrfs/ctree.h
--- 2/fs/btrfs/ctree.h 2010-04-18 08:12:22.086699485 +0800
+++ 3/fs/btrfs/ctree.h 2010-04-18 08:13:15.457699211 +0800
@@ -700,9 +700,7 @@ struct btrfs_space_info {
struct list_head list;
/* for controlling how we free up space for allocations */
- wait_queue_head_t allocate_wait;
wait_queue_head_t flush_wait;
- int allocating_chunk;
int flushing;
/* for block groups in our same type */
diff -urp 2/fs/btrfs/extent-tree.c 3/fs/btrfs/extent-tree.c
--- 2/fs/btrfs/extent-tree.c 2010-04-18 08:12:22.092698714 +0800
+++ 3/fs/btrfs/extent-tree.c 2010-04-18 08:13:15.463699138 +0800
@@ -70,6 +70,9 @@ static int find_next_key(struct btrfs_pa
struct btrfs_key *key);
static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
int dump_block_groups);
+static int maybe_allocate_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_space_info *sinfo, u64 num_bytes);
static noinline int
block_group_cache_done(struct btrfs_block_group_cache *cache)
@@ -2687,7 +2690,6 @@ static int update_space_info(struct btrf
INIT_LIST_HEAD(&found->block_groups[i]);
init_rwsem(&found->groups_sem);
init_waitqueue_head(&found->flush_wait);
- init_waitqueue_head(&found->allocate_wait);
spin_lock_init(&found->lock);
found->flags = flags & (BTRFS_BLOCK_GROUP_DATA |
BTRFS_BLOCK_GROUP_SYSTEM |
@@ -3000,71 +3002,6 @@ flush:
wake_up(&info->flush_wait);
}
-static int maybe_allocate_chunk(struct btrfs_root *root,
- struct btrfs_space_info *info)
-{
- struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
- struct btrfs_trans_handle *trans;
- bool wait = false;
- int ret = 0;
- u64 min_metadata;
- u64 free_space;
-
- free_space = btrfs_super_total_bytes(disk_super);
- /*
- * we allow the metadata to grow to a max of either 10gb or 5% of the
- * space in the volume.
- */
- min_metadata = min((u64)10 * 1024 * 1024 * 1024,
- div64_u64(free_space * 5, 100));
- if (info->total_bytes >= min_metadata) {
- spin_unlock(&info->lock);
- return 0;
- }
-
- if (info->full) {
- spin_unlock(&info->lock);
- return 0;
- }
-
- if (!info->allocating_chunk) {
- info->force_alloc = 1;
- info->allocating_chunk = 1;
- } else {
- wait = true;
- }
-
- spin_unlock(&info->lock);
-
- if (wait) {
- wait_event(info->allocate_wait,
- !info->allocating_chunk);
- return 1;
- }
-
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- ret = -ENOMEM;
- goto out;
- }
-
- ret = do_chunk_alloc(trans, root->fs_info->extent_root,
- 4096 + 2 * 1024 * 1024,
- info->flags, 0);
- btrfs_end_transaction(trans, root);
- if (ret)
- goto out;
-out:
- spin_lock(&info->lock);
- info->allocating_chunk = 0;
- spin_unlock(&info->lock);
- wake_up(&info->allocate_wait);
-
- if (ret)
- return 0;
- return 1;
-}
-
/*
* Reserve metadata space for delalloc.
*/
@@ -3105,7 +3042,8 @@ again:
flushed++;
if (flushed == 1) {
- if (maybe_allocate_chunk(root, meta_sinfo))
+ if (maybe_allocate_chunk(NULL, root, meta_sinfo,
+ num_bytes))
goto again;
flushed++;
} else {
@@ -3220,7 +3158,8 @@ again:
if (used > meta_sinfo->total_bytes) {
retries++;
if (retries == 1) {
- if (maybe_allocate_chunk(root, meta_sinfo))
+ if (maybe_allocate_chunk(NULL, root, meta_sinfo,
+ num_bytes))
goto again;
retries++;
} else {
@@ -3417,13 +3356,28 @@ static void force_metadata_allocation(st
rcu_read_unlock();
}
+static int should_alloc_chunk(struct btrfs_space_info *sinfo,
+ u64 alloc_bytes)
+{
+ u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly;
+
+ if (sinfo->bytes_used + sinfo->bytes_reserved +
+ alloc_bytes + 256 * 1024 * 1024 < num_bytes)
+ return 0;
+
+ if (sinfo->bytes_used + sinfo->bytes_reserved +
+ alloc_bytes < div_factor(num_bytes, 8))
+ return 0;
+
+ return 1;
+}
+
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags, int force)
{
struct btrfs_space_info *space_info;
struct btrfs_fs_info *fs_info = extent_root->fs_info;
- u64 thresh;
int ret = 0;
mutex_lock(&fs_info->chunk_mutex);
@@ -3446,11 +3400,7 @@ static int do_chunk_alloc(struct btrfs_t
goto out;
}
- thresh = space_info->total_bytes - space_info->bytes_readonly;
- thresh = div_factor(thresh, 8);
- if (!force &&
- (space_info->bytes_used + space_info->bytes_pinned +
- space_info->bytes_reserved + alloc_bytes) < thresh) {
+ if (!force && !should_alloc_chunk(space_info, alloc_bytes)) {
spin_unlock(&space_info->lock);
goto out;
}
@@ -3472,6 +3422,8 @@ static int do_chunk_alloc(struct btrfs_t
spin_lock(&space_info->lock);
if (ret)
space_info->full = 1;
+ else
+ ret = 1;
space_info->force_alloc = 0;
spin_unlock(&space_info->lock);
out:
@@ -3479,6 +3431,38 @@ out:
return ret;
}
+static int maybe_allocate_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_space_info *sinfo, u64 num_bytes)
+{
+ int ret;
+ int end_trans = 0;
+
+ if (sinfo->full)
+ return 0;
+
+ spin_lock(&sinfo->lock);
+ ret = should_alloc_chunk(sinfo, num_bytes + 2 * 1024 * 1024);
+ spin_unlock(&sinfo->lock);
+ if (!ret)
+ return 0;
+
+ if (!trans) {
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
+ end_trans = 1;
+ }
+
+ ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+ num_bytes + 2 * 1024 * 1024,
+ get_alloc_profile(root, sinfo->flags), 0);
+
+ if (end_trans)
+ btrfs_end_transaction(trans, root);
+
+ return ret == 1 ? 1 : 0;
+}
+
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,
--
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