@@ -800,6 +800,7 @@ struct btrfs_fs_info {
struct mutex cleaner_mutex;
struct mutex chunk_mutex;
struct mutex volume_mutex;
+ struct rw_semaphore bg_delete_sem;
/*
* this is taken to make sure we don't set block groups ro after
@@ -1079,7 +1080,6 @@ struct btrfs_fs_info {
spinlock_t unused_bgs_lock;
struct list_head unused_bgs;
struct mutex unused_bg_unpin_mutex;
- struct mutex delete_unused_bgs_mutex;
/* For btrfs to record security options */
struct security_mnt_opts security_opts;
@@ -1839,12 +1839,11 @@ static int cleaner_kthread(void *arg)
btrfs_run_defrag_inodes(root->fs_info);
/*
- * Acquires fs_info->delete_unused_bgs_mutex to avoid racing
- * with relocation (btrfs_relocate_chunk) and relocation
- * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
- * after acquiring fs_info->delete_unused_bgs_mutex. So we
- * can't hold, nor need to, fs_info->cleaner_mutex when deleting
- * unused block groups.
+ * Acquires fs_info->bg_delete_sem to avoid racing with
+ * relocation (btrfs_relocate_chunk) and relocation acquires
+ * fs_info->cleaner_mutex (btrfs_relocate_block_group) after
+ * acquiring fs_info->bg_delete_sem. So we can't hold, nor need
+ * to, fs_info->cleaner_mutex when deleting unused block groups.
*/
btrfs_delete_unused_bgs(root->fs_info);
sleep:
@@ -2595,7 +2594,6 @@ int open_ctree(struct super_block *sb,
spin_lock_init(&fs_info->unused_bgs_lock);
rwlock_init(&fs_info->tree_mod_log_lock);
mutex_init(&fs_info->unused_bg_unpin_mutex);
- mutex_init(&fs_info->delete_unused_bgs_mutex);
mutex_init(&fs_info->reloc_mutex);
mutex_init(&fs_info->delalloc_root_mutex);
mutex_init(&fs_info->cleaner_delayed_iput_mutex);
@@ -2683,6 +2681,7 @@ int open_ctree(struct super_block *sb,
init_rwsem(&fs_info->commit_root_sem);
init_rwsem(&fs_info->cleanup_work_sem);
init_rwsem(&fs_info->subvol_sem);
+ init_rwsem(&fs_info->bg_delete_sem);
sema_init(&fs_info->uuid_tree_rescan_sem, 1);
btrfs_init_dev_replace_locks(fs_info);
@@ -4111,6 +4111,7 @@ int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes)
int ret = 0;
int need_commit = 2;
int have_pinned_space;
+ int have_bg_delete_sem = 0;
/* make sure bytes are sectorsize aligned */
bytes = ALIGN(bytes, root->sectorsize);
@@ -4121,8 +4122,11 @@ int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes)
}
data_sinfo = fs_info->data_sinfo;
- if (!data_sinfo)
+ if (!data_sinfo) {
+ down_read(&root->fs_info->bg_delete_sem);
+ have_bg_delete_sem = 1;
goto alloc;
+ }
again:
/* make sure we have enough space to handle the data first */
@@ -4135,6 +4139,17 @@ again:
struct btrfs_trans_handle *trans;
/*
+ * We may need to allocate new chunk, so we should block
+ * btrfs_delete_unused_bgs()
+ */
+ if (!have_bg_delete_sem) {
+ spin_unlock(&data_sinfo->lock);
+ down_read(&root->fs_info->bg_delete_sem);
+ have_bg_delete_sem = 1;
+ goto again;
+ }
+
+ /*
* if we don't have enough free bytes in this space then we need
* to alloc a new chunk.
*/
@@ -4156,17 +4171,20 @@ alloc:
* the fs.
*/
trans = btrfs_join_transaction(root);
- if (IS_ERR(trans))
+ if (IS_ERR(trans)) {
+ up_read(&root->fs_info->bg_delete_sem);
return PTR_ERR(trans);
+ }
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
alloc_target,
CHUNK_ALLOC_NO_FORCE);
btrfs_end_transaction(trans, root);
if (ret < 0) {
- if (ret != -ENOSPC)
+ if (ret != -ENOSPC) {
+ up_read(&root->fs_info->bg_delete_sem);
return ret;
- else {
+ } else {
have_pinned_space = 1;
goto commit_trans;
}
@@ -4200,15 +4218,19 @@ commit_trans:
}
trans = btrfs_join_transaction(root);
- if (IS_ERR(trans))
+ if (IS_ERR(trans)) {
+ up_read(&root->fs_info->bg_delete_sem);
return PTR_ERR(trans);
+ }
if (have_pinned_space >= 0 ||
test_bit(BTRFS_TRANS_HAVE_FREE_BGS,
&trans->transaction->flags) ||
need_commit > 0) {
ret = btrfs_commit_transaction(trans, root);
- if (ret)
+ if (ret) {
+ up_read(&root->fs_info->bg_delete_sem);
return ret;
+ }
/*
* The cleaner kthread might still be doing iput
* operations. Wait for it to finish so that
@@ -4225,6 +4247,7 @@ commit_trans:
trace_btrfs_space_reservation(root->fs_info,
"space_info:enospc",
data_sinfo->flags, bytes, 1);
+ up_read(&root->fs_info->bg_delete_sem);
return -ENOSPC;
}
data_sinfo->bytes_may_use += bytes;
@@ -4232,6 +4255,9 @@ commit_trans:
data_sinfo->flags, bytes, 1);
spin_unlock(&data_sinfo->lock);
+ if (have_bg_delete_sem)
+ up_read(&root->fs_info->bg_delete_sem);
+
return ret;
}
@@ -10593,7 +10619,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
}
spin_unlock(&fs_info->unused_bgs_lock);
- mutex_lock(&fs_info->delete_unused_bgs_mutex);
+ down_write(&root->fs_info->bg_delete_sem);
/* Don't want to race with allocators so take the groups_sem */
down_write(&space_info->groups_sem);
@@ -10721,7 +10747,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
end_trans:
btrfs_end_transaction(trans, root);
next:
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_write(&root->fs_info->bg_delete_sem);
btrfs_put_block_group(block_group);
spin_lock(&fs_info->unused_bgs_lock);
}
@@ -2876,7 +2876,7 @@ static int btrfs_relocate_chunk(struct btrfs_root *root, u64 chunk_offset)
* we release the path used to search the chunk/dev tree and before
* the current task acquires this mutex and calls us.
*/
- ASSERT(mutex_is_locked(&root->fs_info->delete_unused_bgs_mutex));
+ ASSERT(rwsem_is_locked(&root->fs_info->bg_delete_sem));
ret = btrfs_can_relocate(extent_root, chunk_offset);
if (ret)
@@ -2929,10 +2929,10 @@ again:
key.type = BTRFS_CHUNK_ITEM_KEY;
while (1) {
- mutex_lock(&root->fs_info->delete_unused_bgs_mutex);
+ down_read(&root->fs_info->bg_delete_sem);
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
if (ret < 0) {
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
goto error;
}
BUG_ON(ret == 0); /* Corruption */
@@ -2940,7 +2940,7 @@ again:
ret = btrfs_previous_item(chunk_root, path, key.objectid,
key.type);
if (ret)
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
if (ret < 0)
goto error;
if (ret > 0)
@@ -2962,7 +2962,7 @@ again:
else
BUG_ON(ret);
}
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
if (found_key.offset == 0)
break;
@@ -3498,10 +3498,10 @@ again:
goto error;
}
- mutex_lock(&fs_info->delete_unused_bgs_mutex);
+ down_read(&fs_info->bg_delete_sem);
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
if (ret < 0) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
goto error;
}
@@ -3515,7 +3515,7 @@ again:
ret = btrfs_previous_item(chunk_root, path, 0,
BTRFS_CHUNK_ITEM_KEY);
if (ret) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
ret = 0;
break;
}
@@ -3525,7 +3525,7 @@ again:
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid != key.objectid) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
break;
}
@@ -3543,12 +3543,12 @@ again:
btrfs_release_path(path);
if (!ret) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
goto loop;
}
if (counting) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
spin_lock(&fs_info->balance_lock);
bctl->stat.expected++;
spin_unlock(&fs_info->balance_lock);
@@ -3573,7 +3573,7 @@ again:
count_meta < bctl->meta.limit_min)
|| ((chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) &&
count_sys < bctl->sys.limit_min)) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
goto loop;
}
@@ -3586,7 +3586,7 @@ again:
!chunk_reserved && !bytes_used) {
trans = btrfs_start_transaction(chunk_root, 0);
if (IS_ERR(trans)) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
ret = PTR_ERR(trans);
goto error;
}
@@ -3595,7 +3595,7 @@ again:
BTRFS_BLOCK_GROUP_DATA);
btrfs_end_transaction(trans, chunk_root);
if (ret < 0) {
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
goto error;
}
chunk_reserved = 1;
@@ -3603,7 +3603,7 @@ again:
ret = btrfs_relocate_chunk(chunk_root,
found_key.offset);
- mutex_unlock(&fs_info->delete_unused_bgs_mutex);
+ up_read(&fs_info->bg_delete_sem);
if (ret && ret != -ENOSPC)
goto error;
if (ret == -ENOSPC) {
@@ -4330,16 +4330,16 @@ again:
key.type = BTRFS_DEV_EXTENT_KEY;
do {
- mutex_lock(&root->fs_info->delete_unused_bgs_mutex);
+ down_read(&root->fs_info->bg_delete_sem);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
goto done;
}
ret = btrfs_previous_item(root, path, 0, key.type);
if (ret)
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
if (ret < 0)
goto done;
if (ret) {
@@ -4353,7 +4353,7 @@ again:
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
if (key.objectid != device->devid) {
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
btrfs_release_path(path);
break;
}
@@ -4362,7 +4362,7 @@ again:
length = btrfs_dev_extent_length(l, dev_extent);
if (key.offset + length <= new_size) {
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
btrfs_release_path(path);
break;
}
@@ -4371,7 +4371,7 @@ again:
btrfs_release_path(path);
ret = btrfs_relocate_chunk(root, chunk_offset);
- mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
+ up_read(&root->fs_info->bg_delete_sem);
if (ret && ret != -ENOSPC)
goto done;
if (ret == -ENOSPC)
cleaner_kthread() may run at any time, in which it'll call btrfs_delete_unused_bgs() to delete unused block groups. Because this work is asynchronous, it may also result in false ENOSPC error. Please see below race window: CPU1 | CPU2 | |-> btrfs_alloc_data_chunk_ondemand() |-> cleaner_kthread() |-> do_chunk_alloc() | | | assume it returns ENOSPC, which means | | | btrfs_space_info is full and have free| | | space to satisfy data request. | | | | |- > btrfs_delete_unused_bgs() | | | it will decrease btrfs_space_info | | | total_bytes and make | | | btrfs_space_info is not full. | | | In this case, we may get ENOSPC error, but btrfs_space_info is not full. To fix this issue, in btrfs_alloc_data_chunk_ondemand(), if we need to call do_chunk_alloc() to allocating new chunk, we should block btrfs_delete_unused_bgs(). Here we introduce a new struct rw_semaphore bg_delete_sem to do this job. Indeed there is already a "struct mutex delete_unused_bgs_mutex", but it's mutex, we can not use it for this purpose. Of course, we can re-define it to be struct rw_semaphore, then use it in btrfs_alloc_data_chunk_ondemand(). Either method will work. But given that delete_unused_bgs_mutex's name length is longer than bg_delete_sem, I choose the first method, to create a new struct rw_semaphore bg_delete_sem and delete delete_unused_bgs_mutex :) Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> --- v3: improve one code logic suggested by Josef, thanks. v4: replace delete_unused_bgs_mutex with our new bg_delete_sem, also suggested by Josef. --- fs/btrfs/ctree.h | 2 +- fs/btrfs/disk-io.c | 13 ++++++------- fs/btrfs/extent-tree.c | 42 ++++++++++++++++++++++++++++++++++-------- fs/btrfs/volumes.c | 42 +++++++++++++++++++++--------------------- 4 files changed, 62 insertions(+), 37 deletions(-)