From: Filipe Manana Date: Fri, 8 May 2020 10:01:47 +0000 (+0100) Subject: btrfs: rename member 'trimming' of block group to a more generic name X-Git-Tag: v5.15~3340^2~82 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6b7304af62d02d77d740defd4cfddf2ef3188067;p=platform%2Fkernel%2Flinux-starfive.git btrfs: rename member 'trimming' of block group to a more generic name Back in 2014, commit 04216820fe83d5 ("Btrfs: fix race between fs trimming and block group remove/allocation"), I added the 'trimming' member to the block group structure. Its purpose was to prevent races between trimming and block group deletion/allocation by pinning the block group in a way that prevents its logical address and device extents from being reused while trimming is in progress for a block group, so that if another task deletes the block group and then another task allocates a new block group that gets the same logical address and device extents while the trimming task is still in progress. After the previous fix for scrub (patch "btrfs: fix a race between scrub and block group removal/allocation"), scrub now also has the same needs that trimming has, so the member name 'trimming' no longer makes sense. Since there is already a 'pinned' member in the block group that refers to space reservations (pinned bytes), rename the member to 'frozen', add a comment on top of it to describe its general purpose and rename the helpers to increment and decrement the counter as well, to match the new member name. The next patch in the series will move the helpers into a more suitable file (from free-space-cache.c to block-group.c). Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index 5627f53..3ceaacd 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -1073,18 +1073,21 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, spin_lock(&block_group->lock); block_group->removed = 1; /* - * At this point trimming can't start on this block group, because we - * removed the block group from the tree fs_info->block_group_cache_tree - * so no one can't find it anymore and even if someone already got this - * block group before we removed it from the rbtree, they have already - * incremented block_group->trimming - if they didn't, they won't find - * any free space entries because we already removed them all when we - * called btrfs_remove_free_space_cache(). + * At this point trimming or scrub can't start on this block group, + * because we removed the block group from the rbtree + * fs_info->block_group_cache_tree so no one can't find it anymore and + * even if someone already got this block group before we removed it + * from the rbtree, they have already incremented block_group->frozen - + * if they didn't, for the trimming case they won't find any free space + * entries because we already removed them all when we called + * btrfs_remove_free_space_cache(). * * And we must not remove the extent map from the fs_info->mapping_tree * to prevent the same logical address range and physical device space - * ranges from being reused for a new block group. This is because our - * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is + * ranges from being reused for a new block group. This is needed to + * avoid races with trimming and scrub. + * + * An fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is * completely transactionless, so while it is trimming a range the * currently running transaction might finish and a new one start, * allowing for new block groups to be created that can reuse the same @@ -1095,7 +1098,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, * in place until the extents have been discarded completely when * the transaction commit has completed. */ - remove_em = (atomic_read(&block_group->trimming) == 0); + remove_em = (atomic_read(&block_group->frozen) == 0); spin_unlock(&block_group->lock); mutex_unlock(&fs_info->chunk_mutex); @@ -1444,7 +1447,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) /* Implicit trim during transaction commit. */ if (trimming) - btrfs_get_block_group_trimming(block_group); + btrfs_freeze_block_group(block_group); /* * Btrfs_remove_chunk will abort the transaction if things go @@ -1454,7 +1457,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) if (ret) { if (trimming) - btrfs_put_block_group_trimming(block_group); + btrfs_unfreeze_block_group(block_group); goto end_trans; } @@ -1803,7 +1806,7 @@ static struct btrfs_block_group *btrfs_create_block_group_cache( INIT_LIST_HEAD(&cache->dirty_list); INIT_LIST_HEAD(&cache->io_list); btrfs_init_free_space_ctl(cache); - atomic_set(&cache->trimming, 0); + atomic_set(&cache->frozen, 0); mutex_init(&cache->free_space_lock); btrfs_init_full_stripe_locks_tree(&cache->full_stripe_locks_root); diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index 107bb55..04967ea 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -129,8 +129,17 @@ struct btrfs_block_group { /* For read-only block groups */ struct list_head ro_list; + /* + * When non-zero it means the block group's logical address and its + * device extents can not be reused for future block group allocations + * until the counter goes down to 0. This is to prevent them from being + * reused while some task is still using the block group after it was + * deleted - we want to make sure they can only be reused for new block + * groups after that task is done with the deleted block group. + */ + atomic_t frozen; + /* For discard operations */ - atomic_t trimming; struct list_head discard_list; int discard_index; u64 discard_eligible_time; diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 86ec252..242f974 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2481,8 +2481,8 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, struct btrfs_ref *generic_ref); int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr); -void btrfs_get_block_group_trimming(struct btrfs_block_group *cache); -void btrfs_put_block_group_trimming(struct btrfs_block_group *cache); +void btrfs_freeze_block_group(struct btrfs_block_group *cache); +void btrfs_unfreeze_block_group(struct btrfs_block_group *cache); void btrfs_clear_space_info_full(struct btrfs_fs_info *info); enum btrfs_reserve_flush_enum { diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 3593f8c..140011e 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2916,7 +2916,7 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans) &trimmed); list_del_init(&block_group->bg_list); - btrfs_put_block_group_trimming(block_group); + btrfs_unfreeze_block_group(block_group); btrfs_put_block_group(block_group); if (ret) { diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 3613da0..e9cfe9d 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -3762,12 +3762,12 @@ out: return ret; } -void btrfs_get_block_group_trimming(struct btrfs_block_group *cache) +void btrfs_freeze_block_group(struct btrfs_block_group *cache) { - atomic_inc(&cache->trimming); + atomic_inc(&cache->frozen); } -void btrfs_put_block_group_trimming(struct btrfs_block_group *block_group) +void btrfs_unfreeze_block_group(struct btrfs_block_group *block_group) { struct btrfs_fs_info *fs_info = block_group->fs_info; struct extent_map_tree *em_tree; @@ -3775,7 +3775,7 @@ void btrfs_put_block_group_trimming(struct btrfs_block_group *block_group) bool cleanup; spin_lock(&block_group->lock); - cleanup = (atomic_dec_and_test(&block_group->trimming) && + cleanup = (atomic_dec_and_test(&block_group->frozen) && block_group->removed); spin_unlock(&block_group->lock); @@ -3795,8 +3795,9 @@ void btrfs_put_block_group_trimming(struct btrfs_block_group *block_group) free_extent_map(em); /* - * We've left one free space entry and other tasks trimming - * this block group have left 1 entry each one. Free them. + * We may have left one free space entry and other possible + * tasks trimming this block group have left 1 entry each one. + * Free them if any. */ __btrfs_remove_free_space_cache(block_group->free_space_ctl); } @@ -3816,7 +3817,7 @@ int btrfs_trim_block_group(struct btrfs_block_group *block_group, spin_unlock(&block_group->lock); return 0; } - btrfs_get_block_group_trimming(block_group); + btrfs_freeze_block_group(block_group); spin_unlock(&block_group->lock); ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, false); @@ -3829,7 +3830,7 @@ int btrfs_trim_block_group(struct btrfs_block_group *block_group, if (rem) reset_trimming_bitmap(ctl, offset_to_bitmap(ctl, end)); out: - btrfs_put_block_group_trimming(block_group); + btrfs_unfreeze_block_group(block_group); return ret; } @@ -3846,11 +3847,11 @@ int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group, spin_unlock(&block_group->lock); return 0; } - btrfs_get_block_group_trimming(block_group); + btrfs_freeze_block_group(block_group); spin_unlock(&block_group->lock); ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, async); - btrfs_put_block_group_trimming(block_group); + btrfs_unfreeze_block_group(block_group); return ret; } @@ -3868,13 +3869,13 @@ int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group, spin_unlock(&block_group->lock); return 0; } - btrfs_get_block_group_trimming(block_group); + btrfs_freeze_block_group(block_group); spin_unlock(&block_group->lock); ret = trim_bitmaps(block_group, trimmed, start, end, minlen, maxlen, async); - btrfs_put_block_group_trimming(block_group); + btrfs_unfreeze_block_group(block_group); return ret; } diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 7c50ac5..2486f58 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -3583,7 +3583,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, btrfs_put_block_group(cache); goto skip; } - btrfs_get_block_group_trimming(cache); + btrfs_freeze_block_group(cache); spin_unlock(&cache->lock); /* @@ -3641,7 +3641,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, } else { btrfs_warn(fs_info, "failed setting block group ro: %d", ret); - btrfs_put_block_group_trimming(cache); + btrfs_unfreeze_block_group(cache); btrfs_put_block_group(cache); scrub_pause_off(fs_info); break; @@ -3728,7 +3728,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, spin_unlock(&cache->lock); } - btrfs_put_block_group_trimming(cache); + btrfs_unfreeze_block_group(cache); btrfs_put_block_group(cache); if (ret) break; diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 96eb313..f58d0fd 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -142,7 +142,7 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction) struct btrfs_block_group, bg_list); list_del_init(&cache->bg_list); - btrfs_put_block_group_trimming(cache); + btrfs_unfreeze_block_group(cache); btrfs_put_block_group(cache); } WARN_ON(!list_empty(&transaction->dev_update_list));