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btrfs: qgroup: Introduce new functions to reserve/free metadata

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Introduce new functions btrfs_qgroup_reserve/free_meta() to reserve/free
metadata reserved space.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-09-08 17:08:38 +08:00 committed by Chris Mason
parent 297d750b9f
commit 55eeaf0578
4 changed files with 48 additions and 0 deletions
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3
fs/btrfs/ctree.h
View File

@ -1943,6 +1943,9 @@ struct btrfs_root {
int send_in_progress;
struct btrfs_subvolume_writers *subv_writers;
atomic_t will_be_snapshoted;
/* For qgroup metadata space reserve */
atomic_t qgroup_meta_rsv;
};
struct btrfs_ioctl_defrag_range_args {

1
fs/btrfs/disk-io.c
View File

@ -1267,6 +1267,7 @@ static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize,
atomic_set(&root->orphan_inodes, 0);
atomic_set(&root->refs, 1);
atomic_set(&root->will_be_snapshoted, 0);
atomic_set(&root->qgroup_meta_rsv, 0);
root->log_transid = 0;
root->log_transid_committed = -1;
root->last_log_commit = 0;

40
fs/btrfs/qgroup.c
View File

@ -2594,3 +2594,43 @@ int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len)
{
return __btrfs_qgroup_release_data(inode, start, len, 0);
}
int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes)
{
int ret;
if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) ||
num_bytes == 0)
return 0;
BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
ret = btrfs_qgroup_reserve(root, num_bytes);
if (ret < 0)
return ret;
atomic_add(num_bytes, &root->qgroup_meta_rsv);
return ret;
}
void btrfs_qgroup_free_meta_all(struct btrfs_root *root)
{
int reserved;
if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))
return;
reserved = atomic_xchg(&root->qgroup_meta_rsv, 0);
if (reserved == 0)
return;
btrfs_qgroup_free(root, reserved);
}
void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes)
{
if (!root->fs_info->quota_enabled || !is_fstree(root->objectid))
return;
BUG_ON(num_bytes != round_down(num_bytes, root->nodesize));
WARN_ON(atomic_read(&root->qgroup_meta_rsv) < num_bytes);
atomic_sub(num_bytes, &root->qgroup_meta_rsv);
btrfs_qgroup_free(root, num_bytes);
}

4
fs/btrfs/qgroup.h
View File

@ -101,4 +101,8 @@ int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len);
int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);
int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len);
int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes);
void btrfs_qgroup_free_meta_all(struct btrfs_root *root);
void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes);
#endif /* __BTRFS_QGROUP__ */