From 3e43c279e824889dacd5321505a88506e8c772e3 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Thu, 20 Jun 2019 15:38:06 -0400 Subject: [PATCH] btrfs: migrate the block group cleanup code This can now be easily migrated as well. Signed-off-by: Josef Bacik Reviewed-by: David Sterba [ refresh on top of sysfs cleanups ] Signed-off-by: David Sterba --- fs/btrfs/block-group.c | 127 ++++++++++++++++++++++++++++++++++++++++ fs/btrfs/block-group.h | 2 + fs/btrfs/ctree.h | 2 - fs/btrfs/extent-tree.c | 128 ----------------------------------------- 4 files changed, 129 insertions(+), 130 deletions(-) diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index 2608f91a00ef..9c9f5a1bcdcb 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -3045,3 +3045,130 @@ void check_system_chunk(struct btrfs_trans_handle *trans, u64 type) } } +void btrfs_put_block_group_cache(struct btrfs_fs_info *info) +{ + struct btrfs_block_group_cache *block_group; + u64 last = 0; + + while (1) { + struct inode *inode; + + block_group = btrfs_lookup_first_block_group(info, last); + while (block_group) { + btrfs_wait_block_group_cache_done(block_group); + spin_lock(&block_group->lock); + if (block_group->iref) + break; + spin_unlock(&block_group->lock); + block_group = btrfs_next_block_group(block_group); + } + if (!block_group) { + if (last == 0) + break; + last = 0; + continue; + } + + inode = block_group->inode; + block_group->iref = 0; + block_group->inode = NULL; + spin_unlock(&block_group->lock); + ASSERT(block_group->io_ctl.inode == NULL); + iput(inode); + last = block_group->key.objectid + block_group->key.offset; + btrfs_put_block_group(block_group); + } +} + +/* + * Must be called only after stopping all workers, since we could have block + * group caching kthreads running, and therefore they could race with us if we + * freed the block groups before stopping them. + */ +int btrfs_free_block_groups(struct btrfs_fs_info *info) +{ + struct btrfs_block_group_cache *block_group; + struct btrfs_space_info *space_info; + struct btrfs_caching_control *caching_ctl; + struct rb_node *n; + + down_write(&info->commit_root_sem); + while (!list_empty(&info->caching_block_groups)) { + caching_ctl = list_entry(info->caching_block_groups.next, + struct btrfs_caching_control, list); + list_del(&caching_ctl->list); + btrfs_put_caching_control(caching_ctl); + } + up_write(&info->commit_root_sem); + + spin_lock(&info->unused_bgs_lock); + while (!list_empty(&info->unused_bgs)) { + block_group = list_first_entry(&info->unused_bgs, + struct btrfs_block_group_cache, + bg_list); + list_del_init(&block_group->bg_list); + btrfs_put_block_group(block_group); + } + spin_unlock(&info->unused_bgs_lock); + + spin_lock(&info->block_group_cache_lock); + while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { + block_group = rb_entry(n, struct btrfs_block_group_cache, + cache_node); + rb_erase(&block_group->cache_node, + &info->block_group_cache_tree); + RB_CLEAR_NODE(&block_group->cache_node); + spin_unlock(&info->block_group_cache_lock); + + down_write(&block_group->space_info->groups_sem); + list_del(&block_group->list); + up_write(&block_group->space_info->groups_sem); + + /* + * We haven't cached this block group, which means we could + * possibly have excluded extents on this block group. + */ + if (block_group->cached == BTRFS_CACHE_NO || + block_group->cached == BTRFS_CACHE_ERROR) + btrfs_free_excluded_extents(block_group); + + btrfs_remove_free_space_cache(block_group); + ASSERT(block_group->cached != BTRFS_CACHE_STARTED); + ASSERT(list_empty(&block_group->dirty_list)); + ASSERT(list_empty(&block_group->io_list)); + ASSERT(list_empty(&block_group->bg_list)); + ASSERT(atomic_read(&block_group->count) == 1); + btrfs_put_block_group(block_group); + + spin_lock(&info->block_group_cache_lock); + } + spin_unlock(&info->block_group_cache_lock); + + /* + * Now that all the block groups are freed, go through and free all the + * space_info structs. This is only called during the final stages of + * unmount, and so we know nobody is using them. We call + * synchronize_rcu() once before we start, just to be on the safe side. + */ + synchronize_rcu(); + + btrfs_release_global_block_rsv(info); + + while (!list_empty(&info->space_info)) { + space_info = list_entry(info->space_info.next, + struct btrfs_space_info, + list); + + /* + * Do not hide this behind enospc_debug, this is actually + * important and indicates a real bug if this happens. + */ + if (WARN_ON(space_info->bytes_pinned > 0 || + space_info->bytes_reserved > 0 || + space_info->bytes_may_use > 0)) + btrfs_dump_space_info(info, space_info, 0, 0); + list_del(&space_info->list); + btrfs_sysfs_remove_space_info(space_info); + } + return 0; +} diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h index 34a0098eadfc..55e68a8d2c44 100644 --- a/fs/btrfs/block-group.h +++ b/fs/btrfs/block-group.h @@ -220,6 +220,8 @@ int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type); void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type); u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags); +void btrfs_put_block_group_cache(struct btrfs_fs_info *info); +int btrfs_free_block_groups(struct btrfs_fs_info *info); static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info) { diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index e1ad681b9e1a..85b808e3ea42 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2524,7 +2524,6 @@ 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); -int btrfs_free_block_groups(struct btrfs_fs_info *info); void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache); void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache); void btrfs_clear_space_info_full(struct btrfs_fs_info *info); @@ -2561,7 +2560,6 @@ void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes, bool qgroup_free); int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes); -void btrfs_put_block_group_cache(struct btrfs_fs_info *info); u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, u64 start, u64 end); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 402199248549..cd210550a349 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5515,134 +5515,6 @@ u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) return free_bytes; } -void btrfs_put_block_group_cache(struct btrfs_fs_info *info) -{ - struct btrfs_block_group_cache *block_group; - u64 last = 0; - - while (1) { - struct inode *inode; - - block_group = btrfs_lookup_first_block_group(info, last); - while (block_group) { - btrfs_wait_block_group_cache_done(block_group); - spin_lock(&block_group->lock); - if (block_group->iref) - break; - spin_unlock(&block_group->lock); - block_group = btrfs_next_block_group(block_group); - } - if (!block_group) { - if (last == 0) - break; - last = 0; - continue; - } - - inode = block_group->inode; - block_group->iref = 0; - block_group->inode = NULL; - spin_unlock(&block_group->lock); - ASSERT(block_group->io_ctl.inode == NULL); - iput(inode); - last = block_group->key.objectid + block_group->key.offset; - btrfs_put_block_group(block_group); - } -} - -/* - * Must be called only after stopping all workers, since we could have block - * group caching kthreads running, and therefore they could race with us if we - * freed the block groups before stopping them. - */ -int btrfs_free_block_groups(struct btrfs_fs_info *info) -{ - struct btrfs_block_group_cache *block_group; - struct btrfs_space_info *space_info; - struct btrfs_caching_control *caching_ctl; - struct rb_node *n; - - down_write(&info->commit_root_sem); - while (!list_empty(&info->caching_block_groups)) { - caching_ctl = list_entry(info->caching_block_groups.next, - struct btrfs_caching_control, list); - list_del(&caching_ctl->list); - btrfs_put_caching_control(caching_ctl); - } - up_write(&info->commit_root_sem); - - spin_lock(&info->unused_bgs_lock); - while (!list_empty(&info->unused_bgs)) { - block_group = list_first_entry(&info->unused_bgs, - struct btrfs_block_group_cache, - bg_list); - list_del_init(&block_group->bg_list); - btrfs_put_block_group(block_group); - } - spin_unlock(&info->unused_bgs_lock); - - spin_lock(&info->block_group_cache_lock); - while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { - block_group = rb_entry(n, struct btrfs_block_group_cache, - cache_node); - rb_erase(&block_group->cache_node, - &info->block_group_cache_tree); - RB_CLEAR_NODE(&block_group->cache_node); - spin_unlock(&info->block_group_cache_lock); - - down_write(&block_group->space_info->groups_sem); - list_del(&block_group->list); - up_write(&block_group->space_info->groups_sem); - - /* - * We haven't cached this block group, which means we could - * possibly have excluded extents on this block group. - */ - if (block_group->cached == BTRFS_CACHE_NO || - block_group->cached == BTRFS_CACHE_ERROR) - btrfs_free_excluded_extents(block_group); - - btrfs_remove_free_space_cache(block_group); - ASSERT(block_group->cached != BTRFS_CACHE_STARTED); - ASSERT(list_empty(&block_group->dirty_list)); - ASSERT(list_empty(&block_group->io_list)); - ASSERT(list_empty(&block_group->bg_list)); - ASSERT(atomic_read(&block_group->count) == 1); - btrfs_put_block_group(block_group); - - spin_lock(&info->block_group_cache_lock); - } - spin_unlock(&info->block_group_cache_lock); - - /* now that all the block groups are freed, go through and - * free all the space_info structs. This is only called during - * the final stages of unmount, and so we know nobody is - * using them. We call synchronize_rcu() once before we start, - * just to be on the safe side. - */ - synchronize_rcu(); - - btrfs_release_global_block_rsv(info); - - while (!list_empty(&info->space_info)) { - space_info = list_entry(info->space_info.next, - struct btrfs_space_info, - list); - - /* - * Do not hide this behind enospc_debug, this is actually - * important and indicates a real bug if this happens. - */ - if (WARN_ON(space_info->bytes_pinned > 0 || - space_info->bytes_reserved > 0 || - space_info->bytes_may_use > 0)) - btrfs_dump_space_info(info, space_info, 0, 0); - list_del(&space_info->list); - btrfs_sysfs_remove_space_info(space_info); - } - return 0; -} - int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, u64 start, u64 end) { -- 2.45.2