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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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8
fs/btrfs/transaction.h
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@@ -45,13 +45,13 @@ struct btrfs_transaction {
struct btrfs_trans_handle {
u64 transid;
u64 block_group;
u64 bytes_reserved;
unsigned long blocks_reserved;
unsigned long blocks_used;
struct btrfs_transaction *transaction;
u64 block_group;
u64 alloc_exclude_start;
u64 alloc_exclude_nr;
unsigned long delayed_ref_updates;
struct btrfs_transaction *transaction;
struct btrfs_block_rsv *block_rsv;
};
struct btrfs_pending_snapshot {