From 64cfaef6362fc756972f477372997fbe117d79cb Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Tue, 12 Dec 2017 15:34:31 +0800 Subject: [PATCH] btrfs: qgroup: Introduce function to convert META_PREALLOC into META_PERTRANS For meta_prealloc reservation users, after btrfs_join_transaction() caller will modify tree so part (or even all) meta_prealloc reservation should be converted to meta_pertrans until transaction commit time. This patch introduces a new function, btrfs_qgroup_convert_reserved_meta() to do this for META_PREALLOC reservation user. Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/qgroup.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/qgroup.h | 8 +++++++ 2 files changed, 64 insertions(+) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index a7ca464cdbf7..9ce626579c81 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -3134,6 +3134,62 @@ void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes, btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes, type); } +static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root, + int num_bytes) +{ + struct btrfs_root *quota_root = fs_info->quota_root; + struct btrfs_qgroup *qgroup; + struct ulist_node *unode; + struct ulist_iterator uiter; + int ret = 0; + + if (num_bytes == 0) + return; + if (!quota_root) + return; + + spin_lock(&fs_info->qgroup_lock); + qgroup = find_qgroup_rb(fs_info, ref_root); + if (!qgroup) + goto out; + ulist_reinit(fs_info->qgroup_ulist); + ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, + (uintptr_t)qgroup, GFP_ATOMIC); + if (ret < 0) + goto out; + ULIST_ITER_INIT(&uiter); + while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { + struct btrfs_qgroup *qg; + struct btrfs_qgroup_list *glist; + + qg = unode_aux_to_qgroup(unode); + + qgroup_rsv_release(fs_info, qg, num_bytes, + BTRFS_QGROUP_RSV_META_PREALLOC); + qgroup_rsv_add(fs_info, qg, num_bytes, + BTRFS_QGROUP_RSV_META_PERTRANS); + list_for_each_entry(glist, &qg->groups, next_group) { + ret = ulist_add(fs_info->qgroup_ulist, + glist->group->qgroupid, + (uintptr_t)glist->group, GFP_ATOMIC); + if (ret < 0) + goto out; + } + } +out: + spin_unlock(&fs_info->qgroup_lock); +} + +void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + + if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || + !is_fstree(root->objectid)) + return; + qgroup_convert_meta(fs_info, root->objectid, num_bytes); +} + /* * Check qgroup reserved space leaking, normally at destroy inode * time diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index 987a5a49deb8..e63e2d497a8e 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -332,5 +332,13 @@ static inline void btrfs_qgroup_free_meta_prealloc(struct btrfs_root *root, */ void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root); +/* + * Convert @num_bytes of META_PREALLOCATED reservation to META_PERTRANS. + * + * This is called when preallocated meta reservation needs to be used. + * Normally after btrfs_join_transaction() call. + */ +void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes); + void btrfs_qgroup_check_reserved_leak(struct inode *inode); #endif /* __BTRFS_QGROUP__ */