diff options
Diffstat (limited to 'fs/btrfs/transaction.h')
| -rw-r--r-- | fs/btrfs/transaction.h | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index c55e44560103..b6c94ce33503 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -58,6 +58,7 @@ struct btrfs_transaction { /* Be protected by fs_info->trans_lock when we want to change it. */ enum btrfs_trans_state state; + int aborted; struct list_head list; struct extent_io_tree dirty_pages; unsigned long start_time; @@ -68,9 +69,24 @@ struct btrfs_transaction { struct list_head pending_chunks; struct list_head switch_commits; struct list_head dirty_bgs; + + /* + * There is no explicit lock which protects io_bgs, rather its + * consistency is implied by the fact that all the sites which modify + * it do so under some form of transaction critical section, namely: + * + * - btrfs_start_dirty_block_groups - This function can only ever be + * run by one of the transaction committers. Refer to + * BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction + * + * - btrfs_write_dirty_blockgroups - this is called by + * commit_cowonly_roots from transaction critical section + * (TRANS_STATE_COMMIT_DOING) + * + * - btrfs_cleanup_dirty_bgs - called on transaction abort + */ struct list_head io_bgs; struct list_head dropped_roots; - u64 num_dirty_bgs; /* * we need to make sure block group deletion doesn't race with @@ -79,31 +95,28 @@ struct btrfs_transaction { */ struct mutex cache_write_mutex; spinlock_t dirty_bgs_lock; + unsigned int num_dirty_bgs; /* Protected by spin lock fs_info->unused_bgs_lock. */ struct list_head deleted_bgs; spinlock_t dropped_roots_lock; struct btrfs_delayed_ref_root delayed_refs; - int aborted; struct btrfs_fs_info *fs_info; }; #define __TRANS_FREEZABLE (1U << 0) -#define __TRANS_USERSPACE (1U << 8) #define __TRANS_START (1U << 9) #define __TRANS_ATTACH (1U << 10) #define __TRANS_JOIN (1U << 11) #define __TRANS_JOIN_NOLOCK (1U << 12) #define __TRANS_DUMMY (1U << 13) -#define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) #define TRANS_ATTACH (__TRANS_ATTACH) #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) -#define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ - __TRANS_ATTACH) +#define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH) #define BTRFS_SEND_TRANS_STUB ((void *)1) @@ -111,20 +124,19 @@ struct btrfs_trans_handle { u64 transid; u64 bytes_reserved; u64 chunk_bytes_reserved; - unsigned long use_count; - unsigned long blocks_reserved; unsigned long delayed_ref_updates; struct btrfs_transaction *transaction; struct btrfs_block_rsv *block_rsv; struct btrfs_block_rsv *orig_rsv; + refcount_t use_count; + unsigned int type; short aborted; - short adding_csums; + bool adding_csums; bool allocating_chunk; bool can_flush_pending_bgs; bool reloc_reserved; bool sync; bool dirty; - unsigned int type; struct btrfs_root *root; struct btrfs_fs_info *fs_info; struct list_head new_bgs; @@ -187,15 +199,11 @@ struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( struct btrfs_root *root, unsigned int num_items, int min_factor); -struct btrfs_trans_handle *btrfs_start_transaction_lflush( - struct btrfs_root *root, - unsigned int num_items); struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); struct btrfs_trans_handle *btrfs_attach_transaction_barrier( struct btrfs_root *root); -struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid); void btrfs_add_dead_root(struct btrfs_root *root); |