From 1bb91902dc90e25449893e693ad45605cb08fbe5 Mon Sep 17 00:00:00 2001 From: Alexandre Oliva Date: Fri, 14 Oct 2011 12:10:36 -0300 Subject: Btrfs: revamp clustered allocation logic Parameterize clusters on minimum total size, minimum chunk size and minimum contiguous size for at least one chunk, without limits on cluster, window or gap sizes. Don't tolerate any fragmentation for SSD_SPREAD; accept it for metadata, but try to keep data dense. Signed-off-by: Alexandre Oliva Signed-off-by: Chris Mason --- fs/btrfs/free-space-cache.c | 112 +++++++++++++++++++------------------------- 1 file changed, 49 insertions(+), 63 deletions(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index ec23d43d0c3..ce40db59c70 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -2283,23 +2283,23 @@ out: static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, struct btrfs_free_space *entry, struct btrfs_free_cluster *cluster, - u64 offset, u64 bytes, u64 min_bytes) + u64 offset, u64 bytes, + u64 cont1_bytes, u64 min_bytes) { struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; unsigned long next_zero; unsigned long i; - unsigned long search_bits; - unsigned long total_bits; + unsigned long want_bits; + unsigned long min_bits; unsigned long found_bits; unsigned long start = 0; unsigned long total_found = 0; int ret; - bool found = false; i = offset_to_bit(entry->offset, block_group->sectorsize, max_t(u64, offset, entry->offset)); - search_bits = bytes_to_bits(bytes, block_group->sectorsize); - total_bits = bytes_to_bits(min_bytes, block_group->sectorsize); + want_bits = bytes_to_bits(bytes, block_group->sectorsize); + min_bits = bytes_to_bits(min_bytes, block_group->sectorsize); again: found_bits = 0; @@ -2308,7 +2308,7 @@ again: i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { next_zero = find_next_zero_bit(entry->bitmap, BITS_PER_BITMAP, i); - if (next_zero - i >= search_bits) { + if (next_zero - i >= min_bits) { found_bits = next_zero - i; break; } @@ -2318,10 +2318,9 @@ again: if (!found_bits) return -ENOSPC; - if (!found) { + if (!total_found) { start = i; cluster->max_size = 0; - found = true; } total_found += found_bits; @@ -2329,13 +2328,8 @@ again: if (cluster->max_size < found_bits * block_group->sectorsize) cluster->max_size = found_bits * block_group->sectorsize; - if (total_found < total_bits) { - i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, next_zero); - if (i - start > total_bits * 2) { - total_found = 0; - cluster->max_size = 0; - found = false; - } + if (total_found < want_bits || cluster->max_size < cont1_bytes) { + i = next_zero + 1; goto again; } @@ -2351,23 +2345,23 @@ again: /* * This searches the block group for just extents to fill the cluster with. + * Try to find a cluster with at least bytes total bytes, at least one + * extent of cont1_bytes, and other clusters of at least min_bytes. */ static noinline int setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, struct btrfs_free_cluster *cluster, struct list_head *bitmaps, u64 offset, u64 bytes, - u64 min_bytes) + u64 cont1_bytes, u64 min_bytes) { struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; struct btrfs_free_space *first = NULL; struct btrfs_free_space *entry = NULL; - struct btrfs_free_space *prev = NULL; struct btrfs_free_space *last; struct rb_node *node; u64 window_start; u64 window_free; u64 max_extent; - u64 max_gap = 128 * 1024; entry = tree_search_offset(ctl, offset, 0, 1); if (!entry) @@ -2377,8 +2371,8 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, * We don't want bitmaps, so just move along until we find a normal * extent entry. */ - while (entry->bitmap) { - if (list_empty(&entry->list)) + while (entry->bitmap || entry->bytes < min_bytes) { + if (entry->bitmap && list_empty(&entry->list)) list_add_tail(&entry->list, bitmaps); node = rb_next(&entry->offset_index); if (!node) @@ -2391,12 +2385,9 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, max_extent = entry->bytes; first = entry; last = entry; - prev = entry; - while (window_free <= min_bytes) { - node = rb_next(&entry->offset_index); - if (!node) - return -ENOSPC; + for (node = rb_next(&entry->offset_index); node; + node = rb_next(&entry->offset_index)) { entry = rb_entry(node, struct btrfs_free_space, offset_index); if (entry->bitmap) { @@ -2405,26 +2396,18 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, continue; } - /* - * we haven't filled the empty size and the window is - * very large. reset and try again - */ - if (entry->offset - (prev->offset + prev->bytes) > max_gap || - entry->offset - window_start > (min_bytes * 2)) { - first = entry; - window_start = entry->offset; - window_free = entry->bytes; - last = entry; + if (entry->bytes < min_bytes) + continue; + + last = entry; + window_free += entry->bytes; + if (entry->bytes > max_extent) max_extent = entry->bytes; - } else { - last = entry; - window_free += entry->bytes; - if (entry->bytes > max_extent) - max_extent = entry->bytes; - } - prev = entry; } + if (window_free < bytes || max_extent < cont1_bytes) + return -ENOSPC; + cluster->window_start = first->offset; node = &first->offset_index; @@ -2438,7 +2421,7 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, entry = rb_entry(node, struct btrfs_free_space, offset_index); node = rb_next(&entry->offset_index); - if (entry->bitmap) + if (entry->bitmap || entry->bytes < min_bytes) continue; rb_erase(&entry->offset_index, &ctl->free_space_offset); @@ -2460,7 +2443,7 @@ static noinline int setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, struct btrfs_free_cluster *cluster, struct list_head *bitmaps, u64 offset, u64 bytes, - u64 min_bytes) + u64 cont1_bytes, u64 min_bytes) { struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; struct btrfs_free_space *entry; @@ -2485,7 +2468,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, if (entry->bytes < min_bytes) continue; ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, - bytes, min_bytes); + bytes, cont1_bytes, min_bytes); if (!ret) return 0; } @@ -2499,7 +2482,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, /* * here we try to find a cluster of blocks in a block group. The goal - * is to find at least bytes free and up to empty_size + bytes free. + * is to find at least bytes+empty_size. * We might not find them all in one contiguous area. * * returns zero and sets up cluster if things worked out, otherwise @@ -2515,23 +2498,24 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, struct btrfs_free_space *entry, *tmp; LIST_HEAD(bitmaps); u64 min_bytes; + u64 cont1_bytes; int ret; - /* for metadata, allow allocates with more holes */ + /* + * Choose the minimum extent size we'll require for this + * cluster. For SSD_SPREAD, don't allow any fragmentation. + * For metadata, allow allocates with smaller extents. For + * data, keep it dense. + */ if (btrfs_test_opt(root, SSD_SPREAD)) { - min_bytes = bytes + empty_size; + cont1_bytes = min_bytes = bytes + empty_size; } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { - /* - * we want to do larger allocations when we are - * flushing out the delayed refs, it helps prevent - * making more work as we go along. - */ - if (trans->transaction->delayed_refs.flushing) - min_bytes = max(bytes, (bytes + empty_size) >> 1); - else - min_bytes = max(bytes, (bytes + empty_size) >> 4); - } else - min_bytes = max(bytes, (bytes + empty_size) >> 2); + cont1_bytes = bytes; + min_bytes = block_group->sectorsize; + } else { + cont1_bytes = max(bytes, (bytes + empty_size) >> 2); + min_bytes = block_group->sectorsize; + } spin_lock(&ctl->tree_lock); @@ -2539,7 +2523,7 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, * If we know we don't have enough space to make a cluster don't even * bother doing all the work to try and find one. */ - if (ctl->free_space < min_bytes) { + if (ctl->free_space < bytes) { spin_unlock(&ctl->tree_lock); return -ENOSPC; } @@ -2553,10 +2537,12 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, } ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, - bytes, min_bytes); + bytes + empty_size, + cont1_bytes, min_bytes); if (ret) ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, - offset, bytes, min_bytes); + offset, bytes + empty_size, + cont1_bytes, min_bytes); /* Clear our temporary list */ list_for_each_entry_safe(entry, tmp, &bitmaps, list) -- cgit v1.2.3 From db804f23a72bada58f083dfad6a65d019ddb3bd4 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 10 Jan 2012 16:41:01 +0800 Subject: Btrfs: add pinned extents to on-disk free space cache correctly I got this while running xfstests: [24256.836098] block group 317849600 has an wrong amount of free space [24256.836100] btrfs: failed to load free space cache for block group 317849600 We should clamp the extent returned by find_first_extent_bit(), so the start of the extent won't smaller than the start of the block group. Signed-off-by: Li Zefan --- fs/btrfs/free-space-cache.c | 41 ++++++++++++++++++++--------------------- 1 file changed, 20 insertions(+), 21 deletions(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index ec23d43d0c3..01840ef95a3 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -838,7 +838,7 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, struct io_ctl io_ctl; struct list_head bitmap_list; struct btrfs_key key; - u64 start, end, len; + u64 start, extent_start, extent_end, len; int entries = 0; int bitmaps = 0; int ret; @@ -857,25 +857,12 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, struct btrfs_free_cluster, block_group_list); - /* - * We shouldn't have switched the pinned extents yet so this is the - * right one - */ - unpin = root->fs_info->pinned_extents; - /* Lock all pages first so we can lock the extent safely. */ io_ctl_prepare_pages(&io_ctl, inode, 0); lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, 0, &cached_state, GFP_NOFS); - /* - * When searching for pinned extents, we need to start at our start - * offset. - */ - if (block_group) - start = block_group->key.objectid; - node = rb_first(&ctl->free_space_offset); if (!node && cluster) { node = rb_first(&cluster->root); @@ -918,9 +905,20 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, * We want to add any pinned extents to our free space cache * so we don't leak the space */ + + /* + * We shouldn't have switched the pinned extents yet so this is the + * right one + */ + unpin = root->fs_info->pinned_extents; + + if (block_group) + start = block_group->key.objectid; + while (block_group && (start < block_group->key.objectid + block_group->key.offset)) { - ret = find_first_extent_bit(unpin, start, &start, &end, + ret = find_first_extent_bit(unpin, start, + &extent_start, &extent_end, EXTENT_DIRTY); if (ret) { ret = 0; @@ -928,20 +926,21 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, } /* This pinned extent is out of our range */ - if (start >= block_group->key.objectid + + if (extent_start >= block_group->key.objectid + block_group->key.offset) break; - len = block_group->key.objectid + - block_group->key.offset - start; - len = min(len, end + 1 - start); + extent_start = max(extent_start, start); + extent_end = min(block_group->key.objectid + + block_group->key.offset, extent_end + 1); + len = extent_end - extent_start; entries++; - ret = io_ctl_add_entry(&io_ctl, start, len, NULL); + ret = io_ctl_add_entry(&io_ctl, extent_start, len, NULL); if (ret) goto out_nospc; - start = end + 1; + start = extent_end; } /* Write out the bitmaps */ -- cgit v1.2.3 From a1ee5a45818acc7f9c13e560827cf3e8735ac919 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Mon, 9 Jan 2012 14:27:42 +0800 Subject: Btrfs: avoid possible NULL deref in io_ctl_drop_pages() If we run into some failure path in io_ctl_prepare_pages(), io_ctl->pages[] array may have some NULL pointers. Signed-off-by: Li Zefan --- fs/btrfs/free-space-cache.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 01840ef95a3..4e55af333e1 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -319,9 +319,11 @@ static void io_ctl_drop_pages(struct io_ctl *io_ctl) io_ctl_unmap_page(io_ctl); for (i = 0; i < io_ctl->num_pages; i++) { - ClearPageChecked(io_ctl->pages[i]); - unlock_page(io_ctl->pages[i]); - page_cache_release(io_ctl->pages[i]); + if (io_ctl->pages[i]) { + ClearPageChecked(io_ctl->pages[i]); + unlock_page(io_ctl->pages[i]); + page_cache_release(io_ctl->pages[i]); + } } } -- cgit v1.2.3 From 706efc6630c2722602541a6a2fc5900a4e38456a Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Mon, 9 Jan 2012 14:36:28 +0800 Subject: Btrfs: check the return value of io_ctl_init() It can return -ENOMEM. Signed-off-by: Li Zefan --- fs/btrfs/free-space-cache.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 4e55af333e1..e4eb222147c 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -637,7 +637,10 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, if (!num_entries) return 0; - io_ctl_init(&io_ctl, inode, root); + ret = io_ctl_init(&io_ctl, inode, root); + if (ret) + return ret; + ret = readahead_cache(inode); if (ret) goto out; @@ -851,7 +854,9 @@ int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, if (!i_size_read(inode)) return -1; - io_ctl_init(&io_ctl, inode, root); + ret = io_ctl_init(&io_ctl, inode, root); + if (ret) + return -1; /* Get the cluster for this block_group if it exists */ if (block_group && !list_empty(&block_group->cluster_list)) -- cgit v1.2.3 From 7fe1e641502616220437079258506196bc4d8cbf Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 29 Dec 2011 14:47:27 +0800 Subject: Btrfs: rewrite btrfs_trim_block_group() There are various bugs in block group trimming: - It may trim from offset smaller than user-specified offset. - It may trim beyond user-specified range. - It may leak free space for extents smaller than specified minlen. - It may truncate the last trimmed extent thus leak free space. - With mixed extents+bitmaps, some extents may not be trimmed. - With mixed extents+bitmaps, some bitmaps may not be trimmed (even none will be trimmed). Even for those trimmed, not all the free space in the bitmaps will be trimmed. I rewrite btrfs_trim_block_group() and break it into two functions. One is to trim extents only, and the other is to trim bitmaps only. Before patching: # fstrim -v /mnt/ /mnt/: 1496465408 bytes were trimmed After patching: # fstrim -v /mnt/ /mnt/: 2193768448 bytes were trimmed And this matches the total free space: # btrfs fi df /mnt Data: total=3.58GB, used=1.79GB System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=205.12MB, used=97.14MB Metadata: total=8.00MB, used=0.00 Signed-off-by: Li Zefan --- fs/btrfs/free-space-cache.c | 235 +++++++++++++++++++++++++++++++------------- 1 file changed, 164 insertions(+), 71 deletions(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index e4eb222147c..b3cbb8939fa 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -2594,17 +2594,57 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) cluster->block_group = NULL; } -int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, - u64 *trimmed, u64 start, u64 end, u64 minlen) +static int do_trimming(struct btrfs_block_group_cache *block_group, + u64 *total_trimmed, u64 start, u64 bytes, + u64 reserved_start, u64 reserved_bytes) { - struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; - struct btrfs_free_space *entry = NULL; + struct btrfs_space_info *space_info = block_group->space_info; struct btrfs_fs_info *fs_info = block_group->fs_info; - u64 bytes = 0; - u64 actually_trimmed; - int ret = 0; + int ret; + int update = 0; + u64 trimmed = 0; - *trimmed = 0; + spin_lock(&space_info->lock); + spin_lock(&block_group->lock); + if (!block_group->ro) { + block_group->reserved += reserved_bytes; + space_info->bytes_reserved += reserved_bytes; + update = 1; + } + spin_unlock(&block_group->lock); + spin_unlock(&space_info->lock); + + ret = btrfs_error_discard_extent(fs_info->extent_root, + start, bytes, &trimmed); + if (!ret) + *total_trimmed += trimmed; + + btrfs_add_free_space(block_group, reserved_start, reserved_bytes); + + if (update) { + spin_lock(&space_info->lock); + spin_lock(&block_group->lock); + if (block_group->ro) + space_info->bytes_readonly += reserved_bytes; + block_group->reserved -= reserved_bytes; + space_info->bytes_reserved -= reserved_bytes; + spin_unlock(&space_info->lock); + spin_unlock(&block_group->lock); + } + + return ret; +} + +static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, + u64 *total_trimmed, u64 start, u64 end, u64 minlen) +{ + struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; + struct btrfs_free_space *entry; + struct rb_node *node; + int ret = 0; + u64 extent_start; + u64 extent_bytes; + u64 bytes; while (start < end) { spin_lock(&ctl->tree_lock); @@ -2615,81 +2655,118 @@ int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, } entry = tree_search_offset(ctl, start, 0, 1); - if (!entry) - entry = tree_search_offset(ctl, - offset_to_bitmap(ctl, start), - 1, 1); - - if (!entry || entry->offset >= end) { + if (!entry) { spin_unlock(&ctl->tree_lock); break; } - if (entry->bitmap) { - ret = search_bitmap(ctl, entry, &start, &bytes); - if (!ret) { - if (start >= end) { - spin_unlock(&ctl->tree_lock); - break; - } - bytes = min(bytes, end - start); - bitmap_clear_bits(ctl, entry, start, bytes); - if (entry->bytes == 0) - free_bitmap(ctl, entry); - } else { - start = entry->offset + BITS_PER_BITMAP * - block_group->sectorsize; + /* skip bitmaps */ + while (entry->bitmap) { + node = rb_next(&entry->offset_index); + if (!node) { spin_unlock(&ctl->tree_lock); - ret = 0; - continue; + goto out; } - } else { - start = entry->offset; - bytes = min(entry->bytes, end - start); - unlink_free_space(ctl, entry); - kmem_cache_free(btrfs_free_space_cachep, entry); + entry = rb_entry(node, struct btrfs_free_space, + offset_index); + } + + if (entry->offset >= end) { + spin_unlock(&ctl->tree_lock); + break; + } + + extent_start = entry->offset; + extent_bytes = entry->bytes; + start = max(start, extent_start); + bytes = min(extent_start + extent_bytes, end) - start; + if (bytes < minlen) { + spin_unlock(&ctl->tree_lock); + goto next; } + unlink_free_space(ctl, entry); + kmem_cache_free(btrfs_free_space_cachep, entry); + spin_unlock(&ctl->tree_lock); - if (bytes >= minlen) { - struct btrfs_space_info *space_info; - int update = 0; - - space_info = block_group->space_info; - spin_lock(&space_info->lock); - spin_lock(&block_group->lock); - if (!block_group->ro) { - block_group->reserved += bytes; - space_info->bytes_reserved += bytes; - update = 1; - } - spin_unlock(&block_group->lock); - spin_unlock(&space_info->lock); - - ret = btrfs_error_discard_extent(fs_info->extent_root, - start, - bytes, - &actually_trimmed); - - btrfs_add_free_space(block_group, start, bytes); - if (update) { - spin_lock(&space_info->lock); - spin_lock(&block_group->lock); - if (block_group->ro) - space_info->bytes_readonly += bytes; - block_group->reserved -= bytes; - space_info->bytes_reserved -= bytes; - spin_unlock(&space_info->lock); - spin_unlock(&block_group->lock); - } + ret = do_trimming(block_group, total_trimmed, start, bytes, + extent_start, extent_bytes); + if (ret) + break; +next: + start += bytes; - if (ret) - break; - *trimmed += actually_trimmed; + if (fatal_signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + + cond_resched(); + } +out: + return ret; +} + +static int trim_bitmaps(struct btrfs_block_group_cache *block_group, + u64 *total_trimmed, u64 start, u64 end, u64 minlen) +{ + struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; + struct btrfs_free_space *entry; + int ret = 0; + int ret2; + u64 bytes; + u64 offset = offset_to_bitmap(ctl, start); + + while (offset < end) { + bool next_bitmap = false; + + spin_lock(&ctl->tree_lock); + + if (ctl->free_space < minlen) { + spin_unlock(&ctl->tree_lock); + break; + } + + entry = tree_search_offset(ctl, offset, 1, 0); + if (!entry) { + spin_unlock(&ctl->tree_lock); + next_bitmap = true; + goto next; + } + + bytes = minlen; + ret2 = search_bitmap(ctl, entry, &start, &bytes); + if (ret2 || start >= end) { + spin_unlock(&ctl->tree_lock); + next_bitmap = true; + goto next; + } + + bytes = min(bytes, end - start); + if (bytes < minlen) { + spin_unlock(&ctl->tree_lock); + goto next; + } + + bitmap_clear_bits(ctl, entry, start, bytes); + if (entry->bytes == 0) + free_bitmap(ctl, entry); + + spin_unlock(&ctl->tree_lock); + + ret = do_trimming(block_group, total_trimmed, start, bytes, + start, bytes); + if (ret) + break; +next: + if (next_bitmap) { + offset += BITS_PER_BITMAP * ctl->unit; + } else { + start += bytes; + if (start >= offset + BITS_PER_BITMAP * ctl->unit) + offset += BITS_PER_BITMAP * ctl->unit; } - start += bytes; - bytes = 0; if (fatal_signal_pending(current)) { ret = -ERESTARTSYS; @@ -2702,6 +2779,22 @@ int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, return ret; } +int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, + u64 *trimmed, u64 start, u64 end, u64 minlen) +{ + int ret; + + *trimmed = 0; + + ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); + if (ret) + return ret; + + ret = trim_bitmaps(block_group, trimmed, start, end, minlen); + + return ret; +} + /* * Find the left-most item in the cache tree, and then return the * smallest inode number in the item. -- cgit v1.2.3 From 3f7de037fb3727b20bc27332cdcf2488b702394c Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Thu, 10 Nov 2011 08:29:20 -0500 Subject: Btrfs: add allocator tracepoints I used these tracepoints when figuring out what the cluster stuff was doing, so add them to mainline in case we need to profile this stuff again. Thanks, Signed-off-by: Josef Bacik --- fs/btrfs/free-space-cache.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/free-space-cache.c') diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 6c7887a7770..efe20032e4a 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -2346,6 +2346,8 @@ again: &entry->offset_index, 1); BUG_ON(ret); + trace_btrfs_setup_cluster(block_group, cluster, + total_found * block_group->sectorsize, 1); return 0; } @@ -2368,6 +2370,7 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, u64 window_start; u64 window_free; u64 max_extent; + u64 total_size = 0; entry = tree_search_offset(ctl, offset, 0, 1); if (!entry) @@ -2433,11 +2436,12 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, rb_erase(&entry->offset_index, &ctl->free_space_offset); ret = tree_insert_offset(&cluster->root, entry->offset, &entry->offset_index, 0); + total_size += entry->bytes; BUG_ON(ret); } while (node && entry != last); cluster->max_size = max_extent; - + trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); return 0; } @@ -2542,6 +2546,10 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, goto out; } + trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, + min_bytes); + + INIT_LIST_HEAD(&bitmaps); ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, bytes + empty_size, cont1_bytes, min_bytes); @@ -2559,6 +2567,8 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, list_add_tail(&cluster->block_group_list, &block_group->cluster_list); cluster->block_group = block_group; + } else { + trace_btrfs_failed_cluster_setup(block_group); } out: spin_unlock(&cluster->lock); -- cgit v1.2.3