diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 82ee56bba299..a54d354cefcb 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -127,6 +127,14 @@ struct btrfs_inode { */ u64 last_unlink_trans; + /* + * These two counters are for delalloc metadata reservations. We keep + * track of how many extents we've accounted for vs how many extents we + * have. + */ + int delalloc_reserved_extents; + int delalloc_extents; + /* * ordered_data_close is set by truncate when a file that used * to have good data has been truncated to zero. When it is set diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 80599b4e42bd..b3959a150c3b 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -675,18 +675,19 @@ struct btrfs_space_info { current allocations */ u64 bytes_readonly; /* total bytes that are read only */ u64 bytes_super; /* total bytes reserved for the super blocks */ - - /* delalloc accounting */ - u64 bytes_delalloc; /* number of bytes reserved for allocation, - this space is not necessarily reserved yet - by the allocator */ + u64 bytes_root; /* the number of bytes needed to commit a + transaction */ u64 bytes_may_use; /* number of bytes that may be used for - delalloc */ + delalloc/allocations */ + u64 bytes_delalloc; /* number of bytes currently reserved for + delayed allocation */ int full; /* indicates that we cannot allocate any more chunks for this space */ int force_alloc; /* set if we need to force a chunk alloc for this space */ + int force_delalloc; /* make people start doing filemap_flush until + we're under a threshold */ struct list_head list; @@ -695,6 +696,9 @@ struct btrfs_space_info { spinlock_t lock; struct rw_semaphore groups_sem; atomic_t caching_threads; + + int allocating_chunk; + wait_queue_head_t wait; }; /* @@ -2022,7 +2026,12 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); void btrfs_clear_space_info_full(struct btrfs_fs_info *info); -int btrfs_check_metadata_free_space(struct btrfs_root *root); +int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items); +int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items); +int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root, + struct inode *inode, int num_items); +int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root, + struct inode *inode, int num_items); int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, u64 bytes); void btrfs_free_reserved_data_space(struct btrfs_root *root, diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index f1e905f7e701..ece8d1e26b5e 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1629,7 +1629,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, fs_info->sb = sb; fs_info->max_extent = (u64)-1; fs_info->max_inline = 8192 * 1024; - fs_info->metadata_ratio = 8; + fs_info->metadata_ratio = 0; fs_info->thread_pool_size = min_t(unsigned long, num_online_cpus() + 2, 8); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 90d314eeff6d..a4b2b03cd682 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -68,6 +68,8 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans, struct extent_buffer **must_clean); static int find_next_key(struct btrfs_path *path, int level, struct btrfs_key *key); +static void dump_space_info(struct btrfs_space_info *info, u64 bytes, + int dump_block_groups); static noinline int block_group_cache_done(struct btrfs_block_group_cache *cache) @@ -2764,67 +2766,346 @@ void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) alloc_target); } +static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items) +{ + u64 num_bytes; + int level; + + level = BTRFS_MAX_LEVEL - 2; + /* + * NOTE: these calculations are absolutely the worst possible case. + * This assumes that _every_ item we insert will require a new leaf, and + * that the tree has grown to its maximum level size. + */ + + /* + * for every item we insert we could insert both an extent item and a + * extent ref item. Then for ever item we insert, we will need to cow + * both the original leaf, plus the leaf to the left and right of it. + * + * Unless we are talking about the extent root, then we just want the + * number of items * 2, since we just need the extent item plus its ref. + */ + if (root == root->fs_info->extent_root) + num_bytes = num_items * 2; + else + num_bytes = (num_items + (2 * num_items)) * 3; + + /* + * num_bytes is total number of leaves we could need times the leaf + * size, and then for every leaf we could end up cow'ing 2 nodes per + * level, down to the leaf level. + */ + num_bytes = (num_bytes * root->leafsize) + + (num_bytes * (level * 2)) * root->nodesize; + + return num_bytes; +} + /* - * for now this just makes sure we have at least 5% of our metadata space free - * for use. + * Unreserve metadata space for delalloc. If we have less reserved credits than + * we have extents, this function does nothing. */ -int btrfs_check_metadata_free_space(struct btrfs_root *root) +int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root, + struct inode *inode, int num_items) { struct btrfs_fs_info *info = root->fs_info; struct btrfs_space_info *meta_sinfo; - u64 alloc_target, thresh; - int committed = 0, ret; + u64 num_bytes; + u64 alloc_target; + bool bug = false; /* get the space info for where the metadata will live */ alloc_target = btrfs_get_alloc_profile(root, 0); meta_sinfo = __find_space_info(info, alloc_target); - if (!meta_sinfo) - goto alloc; + num_bytes = calculate_bytes_needed(root->fs_info->extent_root, + num_items); + + spin_lock(&meta_sinfo->lock); + if (BTRFS_I(inode)->delalloc_reserved_extents <= + BTRFS_I(inode)->delalloc_extents) { + spin_unlock(&meta_sinfo->lock); + return 0; + } + + BTRFS_I(inode)->delalloc_reserved_extents--; + BUG_ON(BTRFS_I(inode)->delalloc_reserved_extents < 0); + + if (meta_sinfo->bytes_delalloc < num_bytes) { + bug = true; + meta_sinfo->bytes_delalloc = 0; + } else { + meta_sinfo->bytes_delalloc -= num_bytes; + } + spin_unlock(&meta_sinfo->lock); + + BUG_ON(bug); + + return 0; +} + +static void check_force_delalloc(struct btrfs_space_info *meta_sinfo) +{ + u64 thresh; + + thresh = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + + meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + + meta_sinfo->bytes_super + meta_sinfo->bytes_root + + meta_sinfo->bytes_may_use; + + thresh = meta_sinfo->total_bytes - thresh; + thresh *= 80; + do_div(thresh, 100); + if (thresh <= meta_sinfo->bytes_delalloc) + meta_sinfo->force_delalloc = 1; + else + meta_sinfo->force_delalloc = 0; +} + +static int maybe_allocate_chunk(struct btrfs_root *root, + struct btrfs_space_info *info) +{ + struct btrfs_super_block *disk_super = &root->fs_info->super_copy; + struct btrfs_trans_handle *trans; + bool wait = false; + int ret = 0; + u64 min_metadata; + u64 free_space; + + free_space = btrfs_super_total_bytes(disk_super); + /* + * we allow the metadata to grow to a max of either 5gb or 5% of the + * space in the volume. + */ + min_metadata = min((u64)5 * 1024 * 1024 * 1024, + div64_u64(free_space * 5, 100)); + if (info->total_bytes >= min_metadata) { + spin_unlock(&info->lock); + return 0; + } + + if (info->full) { + spin_unlock(&info->lock); + return 0; + } + + if (!info->allocating_chunk) { + info->force_alloc = 1; + info->allocating_chunk = 1; + init_waitqueue_head(&info->wait); + } else { + wait = true; + } + + spin_unlock(&info->lock); + + if (wait) { + wait_event(info->wait, + !info->allocating_chunk); + return 1; + } + + trans = btrfs_start_transaction(root, 1); + if (!trans) { + ret = -ENOMEM; + goto out; + } + + ret = do_chunk_alloc(trans, root->fs_info->extent_root, + 4096 + 2 * 1024 * 1024, + info->flags, 0); + btrfs_end_transaction(trans, root); + if (ret) + goto out; +out: + spin_lock(&info->lock); + info->allocating_chunk = 0; + spin_unlock(&info->lock); + wake_up(&info->wait); + + if (ret) + return 0; + return 1; +} + +/* + * Reserve metadata space for delalloc. + */ +int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root, + struct inode *inode, int num_items) +{ + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_space_info *meta_sinfo; + u64 num_bytes; + u64 used; + u64 alloc_target; + int flushed = 0; + int force_delalloc; + + /* get the space info for where the metadata will live */ + alloc_target = btrfs_get_alloc_profile(root, 0); + meta_sinfo = __find_space_info(info, alloc_target); + + num_bytes = calculate_bytes_needed(root->fs_info->extent_root, + num_items); again: spin_lock(&meta_sinfo->lock); - if (!meta_sinfo->full) - thresh = meta_sinfo->total_bytes * 80; - else - thresh = meta_sinfo->total_bytes * 95; - do_div(thresh, 100); + force_delalloc = meta_sinfo->force_delalloc; - if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + - meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + - meta_sinfo->bytes_super > thresh) { - struct btrfs_trans_handle *trans; - if (!meta_sinfo->full) { - meta_sinfo->force_alloc = 1; + if (unlikely(!meta_sinfo->bytes_root)) + meta_sinfo->bytes_root = calculate_bytes_needed(root, 6); + + if (!flushed) + meta_sinfo->bytes_delalloc += num_bytes; + + used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + + meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + + meta_sinfo->bytes_super + meta_sinfo->bytes_root + + meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc; + + if (used > meta_sinfo->total_bytes) { + flushed++; + + if (flushed == 1) { + if (maybe_allocate_chunk(root, meta_sinfo)) + goto again; + flushed++; + } else { spin_unlock(&meta_sinfo->lock); -alloc: - trans = btrfs_start_transaction(root, 1); - if (!trans) - return -ENOMEM; + } - ret = do_chunk_alloc(trans, root->fs_info->extent_root, - 2 * 1024 * 1024, alloc_target, 0); - btrfs_end_transaction(trans, root); - if (!meta_sinfo) { - meta_sinfo = __find_space_info(info, - alloc_target); - } + if (flushed == 2) { + filemap_flush(inode->i_mapping); + goto again; + } else if (flushed == 3) { + btrfs_start_delalloc_inodes(root); + btrfs_wait_ordered_extents(root, 0); goto again; } + spin_lock(&meta_sinfo->lock); + meta_sinfo->bytes_delalloc -= num_bytes; spin_unlock(&meta_sinfo->lock); - - if (!committed) { - committed = 1; - trans = btrfs_join_transaction(root, 1); - if (!trans) - return -ENOMEM; - ret = btrfs_commit_transaction(trans, root); - if (ret) - return ret; - goto again; - } + printk(KERN_ERR "enospc, has %d, reserved %d\n", + BTRFS_I(inode)->delalloc_extents, + BTRFS_I(inode)->delalloc_reserved_extents); + dump_space_info(meta_sinfo, 0, 0); return -ENOSPC; } + + BTRFS_I(inode)->delalloc_reserved_extents++; + check_force_delalloc(meta_sinfo); + spin_unlock(&meta_sinfo->lock); + + if (!flushed && force_delalloc) + filemap_flush(inode->i_mapping); + + return 0; +} + +/* + * unreserve num_items number of items worth of metadata space. This needs to + * be paired with btrfs_reserve_metadata_space. + * + * NOTE: if you have the option, run this _AFTER_ you do a + * btrfs_end_transaction, since btrfs_end_transaction will run delayed ref + * oprations which will result in more used metadata, so we want to make sure we + * can do that without issue. + */ +int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items) +{ + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_space_info *meta_sinfo; + u64 num_bytes; + u64 alloc_target; + bool bug = false; + + /* get the space info for where the metadata will live */ + alloc_target = btrfs_get_alloc_profile(root, 0); + meta_sinfo = __find_space_info(info, alloc_target); + + num_bytes = calculate_bytes_needed(root, num_items); + + spin_lock(&meta_sinfo->lock); + if (meta_sinfo->bytes_may_use < num_bytes) { + bug = true; + meta_sinfo->bytes_may_use = 0; + } else { + meta_sinfo->bytes_may_use -= num_bytes; + } + spin_unlock(&meta_sinfo->lock); + + BUG_ON(bug); + + return 0; +} + +/* + * Reserve some metadata space for use. We'll calculate the worste case number + * of bytes that would be needed to modify num_items number of items. If we + * have space, fantastic, if not, you get -ENOSPC. Please call + * btrfs_unreserve_metadata_space when you are done for the _SAME_ number of + * items you reserved, since whatever metadata you needed should have already + * been allocated. + * + * This will commit the transaction to make more space if we don't have enough + * metadata space. THe only time we don't do this is if we're reserving space + * inside of a transaction, then we will just return -ENOSPC and it is the + * callers responsibility to handle it properly. + */ +int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items) +{ + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_space_info *meta_sinfo; + u64 num_bytes; + u64 used; + u64 alloc_target; + int retries = 0; + + /* get the space info for where the metadata will live */ + alloc_target = btrfs_get_alloc_profile(root, 0); + meta_sinfo = __find_space_info(info, alloc_target); + + num_bytes = calculate_bytes_needed(root, num_items); +again: + spin_lock(&meta_sinfo->lock); + + if (unlikely(!meta_sinfo->bytes_root)) + meta_sinfo->bytes_root = calculate_bytes_needed(root, 6); + + if (!retries) + meta_sinfo->bytes_may_use += num_bytes; + + used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved + + meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly + + meta_sinfo->bytes_super + meta_sinfo->bytes_root + + meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc; + + if (used > meta_sinfo->total_bytes) { + retries++; + if (retries == 1) { + if (maybe_allocate_chunk(root, meta_sinfo)) + goto again; + retries++; + } else { + spin_unlock(&meta_sinfo->lock); + } + + if (retries == 2) { + btrfs_start_delalloc_inodes(root); + btrfs_wait_ordered_extents(root, 0); + goto again; + } + spin_lock(&meta_sinfo->lock); + meta_sinfo->bytes_may_use -= num_bytes; + spin_unlock(&meta_sinfo->lock); + + dump_space_info(meta_sinfo, 0, 0); + return -ENOSPC; + } + + check_force_delalloc(meta_sinfo); spin_unlock(&meta_sinfo->lock); return 0; @@ -2915,7 +3196,7 @@ alloc: BTRFS_I(inode)->reserved_bytes += bytes; spin_unlock(&data_sinfo->lock); - return btrfs_check_metadata_free_space(root); + return 0; } /* @@ -3014,17 +3295,15 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans, BUG_ON(!space_info); spin_lock(&space_info->lock); - if (space_info->force_alloc) { + if (space_info->force_alloc) force = 1; - space_info->force_alloc = 0; - } if (space_info->full) { spin_unlock(&space_info->lock); goto out; } thresh = space_info->total_bytes - space_info->bytes_readonly; - thresh = div_factor(thresh, 6); + thresh = div_factor(thresh, 8); if (!force && (space_info->bytes_used + space_info->bytes_pinned + space_info->bytes_reserved + alloc_bytes) < thresh) { @@ -3038,7 +3317,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans, * we keep a reasonable number of metadata chunks allocated in the * FS as well. */ - if (flags & BTRFS_BLOCK_GROUP_DATA) { + if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { fs_info->data_chunk_allocations++; if (!(fs_info->data_chunk_allocations % fs_info->metadata_ratio)) @@ -3046,8 +3325,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans, } ret = btrfs_alloc_chunk(trans, extent_root, flags); + spin_lock(&space_info->lock); if (ret) space_info->full = 1; + space_info->force_alloc = 0; + spin_unlock(&space_info->lock); out: mutex_unlock(&extent_root->fs_info->chunk_mutex); return ret; @@ -4062,21 +4344,32 @@ loop: return ret; } -static void dump_space_info(struct btrfs_space_info *info, u64 bytes) +static void dump_space_info(struct btrfs_space_info *info, u64 bytes, + int dump_block_groups) { struct btrfs_block_group_cache *cache; + spin_lock(&info->lock); printk(KERN_INFO "space_info has %llu free, is %sfull\n", (unsigned long long)(info->total_bytes - info->bytes_used - - info->bytes_pinned - info->bytes_reserved), + info->bytes_pinned - info->bytes_reserved - + info->bytes_super), (info->full) ? "" : "not "); printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu," - " may_use=%llu, used=%llu\n", + " may_use=%llu, used=%llu, root=%llu, super=%llu, reserved=%llu" + "\n", (unsigned long long)info->total_bytes, (unsigned long long)info->bytes_pinned, (unsigned long long)info->bytes_delalloc, (unsigned long long)info->bytes_may_use, - (unsigned long long)info->bytes_used); + (unsigned long long)info->bytes_used, + (unsigned long long)info->bytes_root, + (unsigned long long)info->bytes_super, + (unsigned long long)info->bytes_reserved); + spin_unlock(&info->lock); + + if (!dump_block_groups) + return; down_read(&info->groups_sem); list_for_each_entry(cache, &info->block_groups, list) { @@ -4144,7 +4437,7 @@ again: printk(KERN_ERR "btrfs allocation failed flags %llu, " "wanted %llu\n", (unsigned long long)data, (unsigned long long)num_bytes); - dump_space_info(sinfo, num_bytes); + dump_space_info(sinfo, num_bytes, 1); } return ret; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 0cb88f8146ea..de1793ba004a 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -280,6 +280,14 @@ static struct extent_buffer *buffer_search(struct extent_io_tree *tree, return NULL; } +static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, + struct extent_state *other) +{ + if (tree->ops && tree->ops->merge_extent_hook) + tree->ops->merge_extent_hook(tree->mapping->host, new, + other); +} + /* * utility function to look for merge candidates inside a given range. * Any extents with matching state are merged together into a single @@ -303,6 +311,7 @@ static int merge_state(struct extent_io_tree *tree, other = rb_entry(other_node, struct extent_state, rb_node); if (other->end == state->start - 1 && other->state == state->state) { + merge_cb(tree, state, other); state->start = other->start; other->tree = NULL; rb_erase(&other->rb_node, &tree->state); @@ -314,33 +323,37 @@ static int merge_state(struct extent_io_tree *tree, other = rb_entry(other_node, struct extent_state, rb_node); if (other->start == state->end + 1 && other->state == state->state) { + merge_cb(tree, state, other); other->start = state->start; state->tree = NULL; rb_erase(&state->rb_node, &tree->state); free_extent_state(state); + state = NULL; } } + return 0; } -static void set_state_cb(struct extent_io_tree *tree, +static int set_state_cb(struct extent_io_tree *tree, struct extent_state *state, unsigned long bits) { if (tree->ops && tree->ops->set_bit_hook) { - tree->ops->set_bit_hook(tree->mapping->host, state->start, - state->end, state->state, bits); + return tree->ops->set_bit_hook(tree->mapping->host, + state->start, state->end, + state->state, bits); } + + return 0; } static void clear_state_cb(struct extent_io_tree *tree, struct extent_state *state, unsigned long bits) { - if (tree->ops && tree->ops->clear_bit_hook) { - tree->ops->clear_bit_hook(tree->mapping->host, state->start, - state->end, state->state, bits); - } + if (tree->ops && tree->ops->clear_bit_hook) + tree->ops->clear_bit_hook(tree->mapping->host, state, bits); } /* @@ -358,6 +371,7 @@ static int insert_state(struct extent_io_tree *tree, int bits) { struct rb_node *node; + int ret; if (end < start) { printk(KERN_ERR "btrfs end < start %llu %llu\n", @@ -365,11 +379,14 @@ static int insert_state(struct extent_io_tree *tree, (unsigned long long)start); WARN_ON(1); } - if (bits & EXTENT_DIRTY) - tree->dirty_bytes += end - start + 1; state->start = start; state->end = end; - set_state_cb(tree, state, bits); + ret = set_state_cb(tree, state, bits); + if (ret) + return ret; + + if (bits & EXTENT_DIRTY) + tree->dirty_bytes += end - start + 1; state->state |= bits; node = tree_insert(&tree->state, end, &state->rb_node); if (node) { @@ -387,6 +404,15 @@ static int insert_state(struct extent_io_tree *tree, return 0; } +static int split_cb(struct extent_io_tree *tree, struct extent_state *orig, + u64 split) +{ + if (tree->ops && tree->ops->split_extent_hook) + return tree->ops->split_extent_hook(tree->mapping->host, + orig, split); + return 0; +} + /* * split a given extent state struct in two, inserting the preallocated * struct 'prealloc' as the newly created second half. 'split' indicates an @@ -405,6 +431,9 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig, struct extent_state *prealloc, u64 split) { struct rb_node *node; + + split_cb(tree, orig, split); + prealloc->start = orig->start; prealloc->end = split - 1; prealloc->state = orig->state; @@ -542,8 +571,8 @@ hit_next: if (err) goto out; if (state->end <= end) { - set |= clear_state_bit(tree, state, bits, - wake, delete); + set |= clear_state_bit(tree, state, bits, wake, + delete); if (last_end == (u64)-1) goto out; start = last_end + 1; @@ -561,12 +590,11 @@ hit_next: prealloc = alloc_extent_state(GFP_ATOMIC); err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); - if (wake) wake_up(&state->wq); - set |= clear_state_bit(tree, prealloc, bits, - wake, delete); + set |= clear_state_bit(tree, prealloc, bits, wake, delete); + prealloc = NULL; goto out; } @@ -667,16 +695,23 @@ out: return 0; } -static void set_state_bits(struct extent_io_tree *tree, +static int set_state_bits(struct extent_io_tree *tree, struct extent_state *state, int bits) { + int ret; + + ret = set_state_cb(tree, state, bits); + if (ret) + return ret; + if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { u64 range = state->end - state->start + 1; tree->dirty_bytes += range; } - set_state_cb(tree, state, bits); state->state |= bits; + + return 0; } static void cache_state(struct extent_state *state, @@ -758,7 +793,10 @@ hit_next: goto out; } - set_state_bits(tree, state, bits); + err = set_state_bits(tree, state, bits); + if (err) + goto out; + cache_state(state, cached_state); merge_state(tree, state); if (last_end == (u64)-1) @@ -805,7 +843,9 @@ hit_next: if (err) goto out; if (state->end <= end) { - set_state_bits(tree, state, bits); + err = set_state_bits(tree, state, bits); + if (err) + goto out; cache_state(state, cached_state); merge_state(tree, state); if (last_end == (u64)-1) @@ -829,11 +869,13 @@ hit_next: this_end = last_start - 1; err = insert_state(tree, prealloc, start, this_end, bits); + BUG_ON(err == -EEXIST); + if (err) { + prealloc = NULL; + goto out; + } cache_state(prealloc, cached_state); prealloc = NULL; - BUG_ON(err == -EEXIST); - if (err) - goto out; start = this_end + 1; goto search_again; } @@ -852,7 +894,11 @@ hit_next: err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); - set_state_bits(tree, prealloc, bits); + err = set_state_bits(tree, prealloc, bits); + if (err) { + prealloc = NULL; + goto out; + } cache_state(prealloc, cached_state); merge_state(tree, prealloc); prealloc = NULL; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 14ed16fd862d..4794ec891fed 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -60,8 +60,13 @@ struct extent_io_ops { struct extent_state *state, int uptodate); int (*set_bit_hook)(struct inode *inode, u64 start, u64 end, unsigned long old, unsigned long bits); - int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end, - unsigned long old, unsigned long bits); + int (*clear_bit_hook)(struct inode *inode, struct extent_state *state, + unsigned long bits); + int (*merge_extent_hook)(struct inode *inode, + struct extent_state *new, + struct extent_state *other); + int (*split_extent_hook)(struct inode *inode, + struct extent_state *orig, u64 split); int (*write_cache_pages_lock_hook)(struct page *page); }; @@ -79,10 +84,14 @@ struct extent_state { u64 start; u64 end; /* inclusive */ struct rb_node rb_node; + + /* ADD NEW ELEMENTS AFTER THIS */ struct extent_io_tree *tree; wait_queue_head_t wq; atomic_t refs; unsigned long state; + u64 split_start; + u64 split_end; /* for use by the FS */ u64 private; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 571ad3c13b47..1be96ba6f6bb 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -123,7 +123,10 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans, root->sectorsize - 1) & ~((u64)root->sectorsize - 1); end_of_last_block = start_pos + num_bytes - 1; - btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block); + err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block); + if (err) + return err; + for (i = 0; i < num_pages; i++) { struct page *p = pages[i]; SetPageUptodate(p); @@ -927,6 +930,11 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, err = file_remove_suid(file); if (err) goto out_nolock; + + err = btrfs_reserve_metadata_for_delalloc(root, inode, 1); + if (err) + goto out_nolock; + file_update_time(file); pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); @@ -1028,6 +1036,7 @@ out: mutex_unlock(&inode->i_mutex); if (ret) err = ret; + btrfs_unreserve_metadata_for_delalloc(root, inode, 1); out_nolock: kfree(pages); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 01c5f8b5a34e..3cc5677f5440 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1159,6 +1159,83 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, return ret; } +static int btrfs_split_extent_hook(struct inode *inode, + struct extent_state *orig, u64 split) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + u64 size; + + if (!(orig->state & EXTENT_DELALLOC)) + return 0; + + size = orig->end - orig->start + 1; + if (size > root->fs_info->max_extent) { + u64 num_extents; + u64 new_size; + + new_size = orig->end - split + 1; + num_extents = div64_u64(size + root->fs_info->max_extent - 1, + root->fs_info->max_extent); + + /* + * if we break a large extent up then leave delalloc_extents be, + * since we've already accounted for the large extent. + */ + if (div64_u64(new_size + root->fs_info->max_extent - 1, + root->fs_info->max_extent) < num_extents) + return 0; + } + + BTRFS_I(inode)->delalloc_extents++; + + return 0; +} + +/* + * extent_io.c merge_extent_hook, used to track merged delayed allocation + * extents so we can keep track of new extents that are just merged onto old + * extents, such as when we are doing sequential writes, so we can properly + * account for the metadata space we'll need. + */ +static int btrfs_merge_extent_hook(struct inode *inode, + struct extent_state *new, + struct extent_state *other) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + u64 new_size, old_size; + u64 num_extents; + + /* not delalloc, ignore it */ + if (!(other->state & EXTENT_DELALLOC)) + return 0; + + old_size = other->end - other->start + 1; + if (new->start < other->start) + new_size = other->end - new->start + 1; + else + new_size = new->end - other->start + 1; + + /* we're not bigger than the max, unreserve the space and go */ + if (new_size <= root->fs_info->max_extent) { + BTRFS_I(inode)->delalloc_extents--; + return 0; + } + + /* + * If we grew by another max_extent, just return, we want to keep that + * reserved amount. + */ + num_extents = div64_u64(old_size + root->fs_info->max_extent - 1, + root->fs_info->max_extent); + if (div64_u64(new_size + root->fs_info->max_extent - 1, + root->fs_info->max_extent) > num_extents) + return 0; + + BTRFS_I(inode)->delalloc_extents--; + + return 0; +} + /* * extent_io.c set_bit_hook, used to track delayed allocation * bytes in this file, and to maintain the list of inodes that @@ -1167,6 +1244,7 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, unsigned long old, unsigned long bits) { + /* * set_bit and clear bit hooks normally require _irqsave/restore * but in this case, we are only testeing for the DELALLOC @@ -1174,6 +1252,8 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, */ if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { struct btrfs_root *root = BTRFS_I(inode)->root; + + BTRFS_I(inode)->delalloc_extents++; btrfs_delalloc_reserve_space(root, inode, end - start + 1); spin_lock(&root->fs_info->delalloc_lock); BTRFS_I(inode)->delalloc_bytes += end - start + 1; @@ -1190,22 +1270,27 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, /* * extent_io.c clear_bit_hook, see set_bit_hook for why */ -static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, - unsigned long old, unsigned long bits) +static int btrfs_clear_bit_hook(struct inode *inode, + struct extent_state *state, unsigned long bits) { /* * set_bit and clear bit hooks normally require _irqsave/restore * but in this case, we are only testeing for the DELALLOC * bit, which is only set or cleared with irqs on */ - if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { + if ((state->state & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { struct btrfs_root *root = BTRFS_I(inode)->root; + BTRFS_I(inode)->delalloc_extents--; + btrfs_unreserve_metadata_for_delalloc(root, inode, 1); + spin_lock(&root->fs_info->delalloc_lock); - if (end - start + 1 > root->fs_info->delalloc_bytes) { + if (state->end - state->start + 1 > + root->fs_info->delalloc_bytes) { printk(KERN_INFO "btrfs warning: delalloc account " "%llu %llu\n", - (unsigned long long)end - start + 1, + (unsigned long long) + state->end - state->start + 1, (unsigned long long) root->fs_info->delalloc_bytes); btrfs_delalloc_free_space(root, inode, (u64)-1); @@ -1213,9 +1298,12 @@ static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, BTRFS_I(inode)->delalloc_bytes = 0; } else { btrfs_delalloc_free_space(root, inode, - end - start + 1); - root->fs_info->delalloc_bytes -= end - start + 1; - BTRFS_I(inode)->delalloc_bytes -= end - start + 1; + state->end - + state->start + 1); + root->fs_info->delalloc_bytes -= state->end - + state->start + 1; + BTRFS_I(inode)->delalloc_bytes -= state->end - + state->start + 1; } if (BTRFS_I(inode)->delalloc_bytes == 0 && !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { @@ -2950,7 +3038,12 @@ again: goto again; } - btrfs_set_extent_delalloc(inode, page_start, page_end); + ret = btrfs_set_extent_delalloc(inode, page_start, page_end); + if (ret) { + unlock_extent(io_tree, page_start, page_end, GFP_NOFS); + goto out_unlock; + } + ret = 0; if (offset != PAGE_CACHE_SIZE) { kaddr = kmap(page); @@ -2981,15 +3074,11 @@ int btrfs_cont_expand(struct inode *inode, loff_t size) u64 last_byte; u64 cur_offset; u64 hole_size; - int err; + int err = 0; if (size <= hole_start) return 0; - err = btrfs_check_metadata_free_space(root); - if (err) - return err; - btrfs_truncate_page(inode->i_mapping, inode->i_size); while (1) { @@ -3024,12 +3113,18 @@ int btrfs_cont_expand(struct inode *inode, loff_t size) cur_offset, &hint_byte, 1); if (err) break; + + err = btrfs_reserve_metadata_space(root, 1); + if (err) + break; + err = btrfs_insert_file_extent(trans, root, inode->i_ino, cur_offset, 0, 0, hole_size, 0, hole_size, 0, 0, 0); btrfs_drop_extent_cache(inode, hole_start, last_byte - 1, 0); + btrfs_unreserve_metadata_space(root, 1); } free_extent_map(em); cur_offset = last_byte; @@ -3990,11 +4085,18 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry, if (!new_valid_dev(rdev)) return -EINVAL; - err = btrfs_check_metadata_free_space(root); + /* + * 2 for inode item and ref + * 2 for dir items + * 1 for xattr if selinux is on + */ + err = btrfs_reserve_metadata_space(root, 5); if (err) - goto fail; + return err; trans = btrfs_start_transaction(root, 1); + if (!trans) + goto fail; btrfs_set_trans_block_group(trans, dir); err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); @@ -4032,6 +4134,7 @@ out_unlock: nr = trans->blocks_used; btrfs_end_transaction_throttle(trans, root); fail: + btrfs_unreserve_metadata_space(root, 5); if (drop_inode) { inode_dec_link_count(inode); iput(inode); @@ -4052,10 +4155,18 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry, u64 objectid; u64 index = 0; - err = btrfs_check_metadata_free_space(root); + /* + * 2 for inode item and ref + * 2 for dir items + * 1 for xattr if selinux is on + */ + err = btrfs_reserve_metadata_space(root, 5); if (err) - goto fail; + return err; + trans = btrfs_start_transaction(root, 1); + if (!trans) + goto fail; btrfs_set_trans_block_group(trans, dir); err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); @@ -4096,6 +4207,7 @@ out_unlock: nr = trans->blocks_used; btrfs_end_transaction_throttle(trans, root); fail: + btrfs_unreserve_metadata_space(root, 5); if (drop_inode) { inode_dec_link_count(inode); iput(inode); @@ -4118,10 +4230,16 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, if (inode->i_nlink == 0) return -ENOENT; - btrfs_inc_nlink(inode); - err = btrfs_check_metadata_free_space(root); + /* + * 1 item for inode ref + * 2 items for dir items + */ + err = btrfs_reserve_metadata_space(root, 3); if (err) - goto fail; + return err; + + btrfs_inc_nlink(inode); + err = btrfs_set_inode_index(dir, &index); if (err) goto fail; @@ -4145,6 +4263,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, nr = trans->blocks_used; btrfs_end_transaction_throttle(trans, root); fail: + btrfs_unreserve_metadata_space(root, 3); if (drop_inode) { inode_dec_link_count(inode); iput(inode); @@ -4164,17 +4283,21 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) u64 index = 0; unsigned long nr = 1; - err = btrfs_check_metadata_free_space(root); + /* + * 2 items for inode and ref + * 2 items for dir items + * 1 for xattr if selinux is on + */ + err = btrfs_reserve_metadata_space(root, 5); if (err) - goto out_unlock; + return err; trans = btrfs_start_transaction(root, 1); - btrfs_set_trans_block_group(trans, dir); - - if (IS_ERR(trans)) { - err = PTR_ERR(trans); + if (!trans) { + err = -ENOMEM; goto out_unlock; } + btrfs_set_trans_block_group(trans, dir); err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); if (err) { @@ -4223,6 +4346,7 @@ out_fail: btrfs_end_transaction_throttle(trans, root); out_unlock: + btrfs_unreserve_metadata_space(root, 5); if (drop_on_err) iput(inode); btrfs_btree_balance_dirty(root, nr); @@ -4747,6 +4871,13 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) goto out; } + ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); + if (ret) { + btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); + ret = VM_FAULT_SIGBUS; + goto out; + } + ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ again: lock_page(page); @@ -4778,7 +4909,12 @@ again: goto again; } - btrfs_set_extent_delalloc(inode, page_start, page_end); + ret = btrfs_set_extent_delalloc(inode, page_start, page_end); + if (ret) { + unlock_extent(io_tree, page_start, page_end, GFP_NOFS); + ret = VM_FAULT_SIGBUS; + goto out_unlock; + } ret = 0; /* page is wholly or partially inside EOF */ @@ -4801,6 +4937,7 @@ again: unlock_extent(io_tree, page_start, page_end, GFP_NOFS); out_unlock: + btrfs_unreserve_metadata_for_delalloc(root, inode, 1); if (!ret) return VM_FAULT_LOCKED; unlock_page(page); @@ -4917,6 +5054,8 @@ struct inode *btrfs_alloc_inode(struct super_block *sb) return NULL; ei->last_trans = 0; ei->logged_trans = 0; + ei->delalloc_extents = 0; + ei->delalloc_reserved_extents = 0; btrfs_ordered_inode_tree_init(&ei->ordered_tree); INIT_LIST_HEAD(&ei->i_orphan); INIT_LIST_HEAD(&ei->ordered_operations); @@ -5070,7 +5209,12 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) return -ENOTEMPTY; - ret = btrfs_check_metadata_free_space(root); + /* + * 2 items for dir items + * 1 item for orphan entry + * 1 item for ref + */ + ret = btrfs_reserve_metadata_space(root, 4); if (ret) return ret; @@ -5185,6 +5329,8 @@ out_fail: if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) up_read(&root->fs_info->subvol_sem); + + btrfs_unreserve_metadata_space(root, 4); return ret; } @@ -5256,11 +5402,18 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) return -ENAMETOOLONG; - err = btrfs_check_metadata_free_space(root); + /* + * 2 items for inode item and ref + * 2 items for dir items + * 1 item for xattr if selinux is on + */ + err = btrfs_reserve_metadata_space(root, 5); if (err) - goto out_fail; + return err; trans = btrfs_start_transaction(root, 1); + if (!trans) + goto out_fail; btrfs_set_trans_block_group(trans, dir); err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); @@ -5341,6 +5494,7 @@ out_unlock: nr = trans->blocks_used; btrfs_end_transaction_throttle(trans, root); out_fail: + btrfs_unreserve_metadata_space(root, 5); if (drop_inode) { inode_dec_link_count(inode); iput(inode); @@ -5362,6 +5516,11 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans, while (num_bytes > 0) { alloc_size = min(num_bytes, root->fs_info->max_extent); + + ret = btrfs_reserve_metadata_space(root, 1); + if (ret) + goto out; + ret = btrfs_reserve_extent(trans, root, alloc_size, root->sectorsize, 0, alloc_hint, (u64)-1, &ins, 1); @@ -5381,6 +5540,7 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans, num_bytes -= ins.offset; cur_offset += ins.offset; alloc_hint = ins.objectid + ins.offset; + btrfs_unreserve_metadata_space(root, 1); } out: if (cur_offset > start) { @@ -5566,6 +5726,8 @@ static struct extent_io_ops btrfs_extent_io_ops = { .readpage_io_failed_hook = btrfs_io_failed_hook, .set_bit_hook = btrfs_set_bit_hook, .clear_bit_hook = btrfs_clear_bit_hook, + .merge_extent_hook = btrfs_merge_extent_hook, + .split_extent_hook = btrfs_split_extent_hook, }; /* diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index a8577a7f26ab..4de7ef6f8603 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -239,7 +239,13 @@ static noinline int create_subvol(struct btrfs_root *root, u64 index = 0; unsigned long nr = 1; - ret = btrfs_check_metadata_free_space(root); + /* + * 1 - inode item + * 2 - refs + * 1 - root item + * 2 - dir items + */ + ret = btrfs_reserve_metadata_space(root, 6); if (ret) return ret; @@ -340,6 +346,9 @@ fail: err = btrfs_commit_transaction(trans, root); if (err && !ret) ret = err; + + btrfs_unreserve_metadata_space(root, 6); + btrfs_btree_balance_dirty(root, nr); return ret; } @@ -355,19 +364,27 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, if (!root->ref_cows) return -EINVAL; - ret = btrfs_check_metadata_free_space(root); + /* + * 1 - inode item + * 2 - refs + * 1 - root item + * 2 - dir items + */ + ret = btrfs_reserve_metadata_space(root, 6); if (ret) goto fail_unlock; pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); if (!pending_snapshot) { ret = -ENOMEM; + btrfs_unreserve_metadata_space(root, 6); goto fail_unlock; } pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); if (!pending_snapshot->name) { ret = -ENOMEM; kfree(pending_snapshot); + btrfs_unreserve_metadata_space(root, 6); goto fail_unlock; } memcpy(pending_snapshot->name, name, namelen); diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 88f866f85e7a..0b8f36d4400a 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -186,6 +186,9 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, h->alloc_exclude_start = 0; h->delayed_ref_updates = 0; + if (!current->journal_info) + current->journal_info = h; + root->fs_info->running_transaction->use_count++; record_root_in_trans(h, root); mutex_unlock(&root->fs_info->trans_mutex); @@ -317,6 +320,9 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, wake_up(&cur_trans->writer_wait); put_transaction(cur_trans); mutex_unlock(&info->trans_mutex); + + if (current->journal_info == trans) + current->journal_info = NULL; memset(trans, 0, sizeof(*trans)); kmem_cache_free(btrfs_trans_handle_cachep, trans); @@ -743,6 +749,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, memcpy(&pending->root_key, &key, sizeof(key)); fail: kfree(new_root_item); + btrfs_unreserve_metadata_space(root, 6); return ret; } @@ -1059,6 +1066,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, mutex_unlock(&root->fs_info->trans_mutex); + if (current->journal_info == trans) + current->journal_info = NULL; + kmem_cache_free(btrfs_trans_handle_cachep, trans); return ret; }