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Btrfs: Metadata reservation for orphan inodes

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reserve metadata space for handling orphan inodes

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2010-05-16 10:49:58 -04:00
committed by Chris Mason
parent 8929ecfa50
commit d68fc57b7e
9 changed files with 367 additions and 68 deletions
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28
fs/btrfs/extent-tree.c
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@@ -3626,6 +3626,34 @@ void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
trans->bytes_reserved = 0;
}
int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root);
struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;
/*
* one for deleting orphan item, one for updating inode and
* two for calling btrfs_truncate_inode_items.
*
* btrfs_truncate_inode_items is a delete operation, it frees
* more space than it uses in most cases. So two units of
* metadata space should be enough for calling it many times.
* If all of the metadata space is used, we can commit
* transaction and use space it freed.
*/
u64 num_bytes = calc_trans_metadata_size(root, 4);
return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
}
void btrfs_orphan_release_metadata(struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 num_bytes = calc_trans_metadata_size(root, 4);
btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes);
}
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending)
{