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Btrfs: Introduce contexts for metadata reservation

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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>
This commit is contained in:
Yan, Zheng
2010-05-16 10:46:25 -04:00
committed by Chris Mason
parent 2ead6ae770
commit f0486c68e4
7 changed files with 861 additions and 393 deletions
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16
fs/btrfs/relocation.c
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@@ -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);