From d0bd456074dca089579818312da7cbe726ad2ff9 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Wed, 23 Sep 2015 14:54:14 -0400 Subject: Btrfs: add fragment=* debug mount option In tracking down these weird bitmap problems it was helpful to artificially create an extremely fragmented file system. These mount options let us either fragment data or metadata or both. With these options I could reproduce all sorts of weird latencies and hangs that occur under extreme fragmentation and get them fixed. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/tests/free-space-tests.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/tests') diff --git a/fs/btrfs/tests/free-space-tests.c b/fs/btrfs/tests/free-space-tests.c index 2299bfde39ee..c8c3d70c31ff 100644 --- a/fs/btrfs/tests/free-space-tests.c +++ b/fs/btrfs/tests/free-space-tests.c @@ -19,6 +19,7 @@ #include #include "btrfs-tests.h" #include "../ctree.h" +#include "../disk-io.h" #include "../free-space-cache.h" #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) @@ -35,6 +36,12 @@ static struct btrfs_block_group_cache *init_test_block_group(void) kfree(cache); return NULL; } + cache->fs_info = btrfs_alloc_dummy_fs_info(); + if (!cache->fs_info) { + kfree(cache->free_space_ctl); + kfree(cache); + return NULL; + } cache->key.objectid = 0; cache->key.offset = 1024 * 1024 * 1024; @@ -879,7 +886,8 @@ test_steal_space_from_bitmap_to_extent(struct btrfs_block_group_cache *cache) int btrfs_test_free_space_cache(void) { struct btrfs_block_group_cache *cache; - int ret; + struct btrfs_root *root = NULL; + int ret = -ENOMEM; test_msg("Running btrfs free space cache tests\n"); @@ -889,6 +897,17 @@ int btrfs_test_free_space_cache(void) return 0; } + root = btrfs_alloc_dummy_root(); + if (!root) + goto out; + + root->fs_info = btrfs_alloc_dummy_fs_info(); + if (!root->fs_info) + goto out; + + root->fs_info->extent_root = root; + cache->fs_info = root->fs_info; + ret = test_extents(cache); if (ret) goto out; @@ -904,6 +923,7 @@ out: __btrfs_remove_free_space_cache(cache->free_space_ctl); kfree(cache->free_space_ctl); kfree(cache); + btrfs_free_dummy_root(root); test_msg("Free space cache tests finished\n"); return ret; } -- cgit v1.2.3