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author | Wang Shilong <wangsl-fnst@cn.fujitsu.com> | 2013-04-07 10:50:17 (GMT) |
---|---|---|
committer | Josef Bacik <jbacik@fusionio.com> | 2013-05-06 19:54:39 (GMT) |
commit | 58400fce5ac5939aadac8ce682edc192c6172f80 (patch) | |
tree | e50f657851833043afaf1ece49bc5e2b348c58a5 /fs/btrfs/qgroup.c | |
parent | f2f6ed3d54648ec19dcdeec30f66843cf7a38487 (diff) | |
download | linux-fsl-qoriq-58400fce5ac5939aadac8ce682edc192c6172f80.tar.xz |
Btrfs: remove some unnecessary spin_lock usages
We use mutex lock to protect all the user change operations.
So when we are calling find_qgroup_rb() to check whether qgroup
exists, we don't have to hold spin_lock.
Besides, when enabling/disabling quota, it must be single thread
when operations come here. spin lock must be firstly used to
clear quota_root when disabling quota, while enabling quota, spin
lock must be used to complete the last assign work.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r-- | fs/btrfs/qgroup.c | 27 |
1 files changed, 6 insertions, 21 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 0a1f686..49c4e63 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -98,7 +98,7 @@ struct btrfs_qgroup_list { struct btrfs_qgroup *member; }; -/* must be called with qgroup_lock held */ +/* must be called with qgroup_ioctl_lock held */ static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid) { @@ -792,13 +792,10 @@ int btrfs_quota_enable(struct btrfs_trans_handle *trans, int slot; mutex_lock(&fs_info->qgroup_ioctl_lock); - spin_lock(&fs_info->qgroup_lock); if (fs_info->quota_root) { fs_info->pending_quota_state = 1; - spin_unlock(&fs_info->qgroup_lock); goto out; } - spin_unlock(&fs_info->qgroup_lock); /* * initially create the quota tree @@ -860,14 +857,11 @@ int btrfs_quota_enable(struct btrfs_trans_handle *trans, if (ret) goto out_free_path; - spin_lock(&fs_info->qgroup_lock); qgroup = add_qgroup_rb(fs_info, found_key.offset); if (IS_ERR(qgroup)) { - spin_unlock(&fs_info->qgroup_lock); ret = PTR_ERR(qgroup); goto out_free_path; } - spin_unlock(&fs_info->qgroup_lock); } ret = btrfs_next_item(tree_root, path); if (ret < 0) @@ -882,13 +876,12 @@ out_add_root: if (ret) goto out_free_path; - spin_lock(&fs_info->qgroup_lock); qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID); if (IS_ERR(qgroup)) { - spin_unlock(&fs_info->qgroup_lock); ret = PTR_ERR(qgroup); goto out_free_path; } + spin_lock(&fs_info->qgroup_lock); fs_info->quota_root = quota_root; fs_info->pending_quota_state = 1; spin_unlock(&fs_info->qgroup_lock); @@ -913,11 +906,9 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans, int ret = 0; mutex_lock(&fs_info->qgroup_ioctl_lock); - spin_lock(&fs_info->qgroup_lock); - if (!fs_info->quota_root) { - spin_unlock(&fs_info->qgroup_lock); + if (!fs_info->quota_root) goto out; - } + spin_lock(&fs_info->qgroup_lock); fs_info->quota_enabled = 0; fs_info->pending_quota_state = 0; quota_root = fs_info->quota_root; @@ -1060,16 +1051,13 @@ int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, } /* check if there are no relations to this qgroup */ - spin_lock(&fs_info->qgroup_lock); qgroup = find_qgroup_rb(fs_info, qgroupid); if (qgroup) { if (!list_empty(&qgroup->groups) || !list_empty(&qgroup->members)) { - spin_unlock(&fs_info->qgroup_lock); ret = -EBUSY; goto out; } } - spin_unlock(&fs_info->qgroup_lock); ret = del_qgroup_item(trans, quota_root, qgroupid); @@ -1106,20 +1094,17 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, (unsigned long long)qgroupid); } - spin_lock(&fs_info->qgroup_lock); - qgroup = find_qgroup_rb(fs_info, qgroupid); if (!qgroup) { ret = -ENOENT; - goto unlock; + goto out; } + spin_lock(&fs_info->qgroup_lock); qgroup->lim_flags = limit->flags; qgroup->max_rfer = limit->max_rfer; qgroup->max_excl = limit->max_excl; qgroup->rsv_rfer = limit->rsv_rfer; qgroup->rsv_excl = limit->rsv_excl; - -unlock: spin_unlock(&fs_info->qgroup_lock); out: mutex_unlock(&fs_info->qgroup_ioctl_lock); |