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| author | Yan, Zheng <zheng.yan@oracle.com> | 2010-05-16 16:46:25 +0200 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-05-25 16:34:50 +0200 |
| commit | f0486c68e4bd9a06a5904d3eeb3a0d73a83befb8 (patch) | |
| tree | 509428ef400ef45e875a3c448b63b86cbea36aea /fs/btrfs/relocation.c | |
| parent | Btrfs: Kill init_btrfs_i() (diff) | |
| download | linux-f0486c68e4bd9a06a5904d3eeb3a0d73a83befb8.tar.xz linux-f0486c68e4bd9a06a5904d3eeb3a0d73a83befb8.zip | |
Btrfs: Introduce contexts for metadata reservation
Introducing metadata reseravtion contexts has two major advantages.
First, it makes metadata reseravtion more traceable. Second, it can
reclaim freed space and re-add them to the itself after transaction
committed.
Besides add btrfs_block_rsv structure and related helper functions,
This patch contains following changes:
Move code that decides if freed tree block should be pinned into
btrfs_free_tree_block().
Make space accounting more accurate, mainly for handling read only
block groups.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/relocation.c')
| -rw-r--r-- | fs/btrfs/relocation.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index e558dd941ded..d565b45a6352 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -3514,6 +3514,7 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) struct btrfs_fs_info *fs_info = extent_root->fs_info; struct reloc_control *rc; int ret; + int rw = 0; int err = 0; rc = kzalloc(sizeof(*rc), GFP_NOFS); @@ -3524,15 +3525,22 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) extent_io_tree_init(&rc->processed_blocks, NULL, GFP_NOFS); INIT_LIST_HEAD(&rc->reloc_roots); + rc->extent_root = extent_root; rc->block_group = btrfs_lookup_block_group(fs_info, group_start); BUG_ON(!rc->block_group); + if (!rc->block_group->ro) { + ret = btrfs_set_block_group_ro(extent_root, rc->block_group); + if (ret) { + err = ret; + goto out; + } + rw = 1; + } + btrfs_init_workers(&rc->workers, "relocate", fs_info->thread_pool_size, NULL); - rc->extent_root = extent_root; - btrfs_prepare_block_group_relocation(extent_root, rc->block_group); - rc->data_inode = create_reloc_inode(fs_info, rc->block_group); if (IS_ERR(rc->data_inode)) { err = PTR_ERR(rc->data_inode); @@ -3597,6 +3605,8 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) WARN_ON(rc->block_group->reserved > 0); WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); out: + if (err && rw) + btrfs_set_block_group_rw(extent_root, rc->block_group); iput(rc->data_inode); btrfs_stop_workers(&rc->workers); btrfs_put_block_group(rc->block_group); |