Btrfs: separate out tests into their own directory

The plan is to have a bunch of unit tests that run when btrfs is loaded when you
build with the appropriate config option.  My ultimate goal is to have a test
for every non-static function we have, but at first I'm going to focus on the
things that cause us the most problems.  To start out with this just adds a
tests/ directory and moves the existing free space cache tests into that
directory and sets up all of the infrastructure.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 58 insertions, 430 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 25f906fd0221..34ecc651c9ab 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2972,33 +2972,68 @@ int btrfs_write_out_ino_cache(struct btrfs_root *root,
 }
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-static struct btrfs_block_group_cache *init_test_block_group(void)
+/*
+ * Use this if you need to make a bitmap or extent entry specifically, it
+ * doesn't do any of the merging that add_free_space does, this acts a lot like
+ * how the free space cache loading stuff works, so you can get really weird
+ * configurations.
+ */
+int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
+                              u64 offset, u64 bytes, bool bitmap)
 {
-        struct btrfs_block_group_cache *cache;
+        struct btrfs_free_space_ctl *ctl = cache->free_space_ctl;
+        struct btrfs_free_space *info = NULL, *bitmap_info;
+        void *map = NULL;
+        u64 bytes_added;
+        int ret;
 
-        cache = kzalloc(sizeof(*cache), GFP_NOFS);
-        if (!cache)
-                return NULL;
-        cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
-                                        GFP_NOFS);
-        if (!cache->free_space_ctl) {
-                kfree(cache);
-                return NULL;
+again:
+        if (!info) {
+                info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS);
+                if (!info)
+                        return -ENOMEM;
         }
 
-        cache->key.objectid = 0;
-        cache->key.offset = 1024 * 1024 * 1024;
-        cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
-        cache->sectorsize = 4096;
+        if (!bitmap) {
+                spin_lock(&ctl->tree_lock);
+                info->offset = offset;
+                info->bytes = bytes;
+                ret = link_free_space(ctl, info);
+                spin_unlock(&ctl->tree_lock);
+                if (ret)
+                        kmem_cache_free(btrfs_free_space_cachep, info);
+                return ret;
+        }
+
+        if (!map) {
+                map = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
+                if (!map) {
+                        kmem_cache_free(btrfs_free_space_cachep, info);
+                        return -ENOMEM;
+                }
+        }
+
+        spin_lock(&ctl->tree_lock);
+        bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
+                                         1, 0);
+        if (!bitmap_info) {
+                info->bitmap = map;
+                map = NULL;
+                add_new_bitmap(ctl, info, offset);
+                bitmap_info = info;
+        }
 
-        spin_lock_init(&cache->lock);
-        INIT_LIST_HEAD(&cache->list);
-        INIT_LIST_HEAD(&cache->cluster_list);
-        INIT_LIST_HEAD(&cache->new_bg_list);
+        bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes);
+        bytes -= bytes_added;
+        offset += bytes_added;
+        spin_unlock(&ctl->tree_lock);
 
-        btrfs_init_free_space_ctl(cache);
+        if (bytes)
+                goto again;
 
-        return cache;
+        if (map)
+                kfree(map);
+        return 0;
 }
 
 /*
@@ -3006,8 +3041,8 @@ static struct btrfs_block_group_cache *init_test_block_group(void)
  * just used to check the absence of space, so if there is free space in the
  * range at all we will return 1.
  */
-static int check_exists(struct btrfs_block_group_cache *cache, u64 offset,
-                        u64 bytes)
+int test_check_exists(struct btrfs_block_group_cache *cache,
+                      u64 offset, u64 bytes)
 {
         struct btrfs_free_space_ctl *ctl = cache->free_space_ctl;
         struct btrfs_free_space *info;
@@ -3084,411 +3119,4 @@ out:
         spin_unlock(&ctl->tree_lock);
         return ret;
 }
-
-/*
- * Use this if you need to make a bitmap or extent entry specifically, it
- * doesn't do any of the merging that add_free_space does, this acts a lot like
- * how the free space cache loading stuff works, so you can get really weird
- * configurations.
- */
-static int add_free_space_entry(struct btrfs_block_group_cache *cache,
-                                u64 offset, u64 bytes, bool bitmap)
-{
-        struct btrfs_free_space_ctl *ctl = cache->free_space_ctl;
-        struct btrfs_free_space *info = NULL, *bitmap_info;
-        void *map = NULL;
-        u64 bytes_added;
-        int ret;
-
-again:
-        if (!info) {
-                info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS);
-                if (!info)
-                        return -ENOMEM;
-        }
-
-        if (!bitmap) {
-                spin_lock(&ctl->tree_lock);
-                info->offset = offset;
-                info->bytes = bytes;
-                ret = link_free_space(ctl, info);
-                spin_unlock(&ctl->tree_lock);
-                if (ret)
-                        kmem_cache_free(btrfs_free_space_cachep, info);
-                return ret;
-        }
-
-        if (!map) {
-                map = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
-                if (!map) {
-                        kmem_cache_free(btrfs_free_space_cachep, info);
-                        return -ENOMEM;
-                }
-        }
-
-        spin_lock(&ctl->tree_lock);
-        bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
-                                         1, 0);
-        if (!bitmap_info) {
-                info->bitmap = map;
-                map = NULL;
-                add_new_bitmap(ctl, info, offset);
-                bitmap_info = info;
-        }
-
-        bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes);
-        bytes -= bytes_added;
-        offset += bytes_added;
-        spin_unlock(&ctl->tree_lock);
-
-        if (bytes)
-                goto again;
-
-        if (map)
-                kfree(map);
-        return 0;
-}
-
-#define test_msg(fmt, ...) printk(KERN_INFO "btrfs: selftest: " fmt, ##__VA_ARGS__)
-
-/*
- * This test just does basic sanity checking, making sure we can add an exten
- * entry and remove space from either end and the middle, and make sure we can
- * remove space that covers adjacent extent entries.
- */
-static int test_extents(struct btrfs_block_group_cache *cache)
-{
-        int ret = 0;
-
-        test_msg("Running extent only tests\n");
-
-        /* First just make sure we can remove an entire entry */
-        ret = btrfs_add_free_space(cache, 0, 4 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error adding initial extents %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 0, 4 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error removing extent %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 0, 4 * 1024 * 1024)) {
-                test_msg("Full remove left some lingering space\n");
-                return -1;
-        }
-
-        /* Ok edge and middle cases now */
-        ret = btrfs_add_free_space(cache, 0, 4 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error adding half extent %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 3 * 1024 * 1024, 1 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error removing tail end %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 0, 1 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error removing front end %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 2 * 1024 * 1024, 4096);
-        if (ret) {
-                test_msg("Error removing middle piece %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 0, 1 * 1024 * 1024)) {
-                test_msg("Still have space at the front\n");
-                return -1;
-        }
-
-        if (check_exists(cache, 2 * 1024 * 1024, 4096)) {
-                test_msg("Still have space in the middle\n");
-                return -1;
-        }
-
-        if (check_exists(cache, 3 * 1024 * 1024, 1 * 1024 * 1024)) {
-                test_msg("Still have space at the end\n");
-                return -1;
-        }
-
-        /* Cleanup */
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-
-        return 0;
-}
-
-static int test_bitmaps(struct btrfs_block_group_cache *cache)
-{
-        u64 next_bitmap_offset;
-        int ret;
-
-        test_msg("Running bitmap only tests\n");
-
-        ret = add_free_space_entry(cache, 0, 4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't create a bitmap entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 0, 4 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error removing bitmap full range %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 0, 4 * 1024 * 1024)) {
-                test_msg("Left some space in bitmap\n");
-                return -1;
-        }
-
-        ret = add_free_space_entry(cache, 0, 4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add to our bitmap entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 1 * 1024 * 1024, 2 * 1024 * 1024);
-        if (ret) {
-                test_msg("Couldn't remove middle chunk %d\n", ret);
-                return ret;
-        }
-
-        /*
-         * The first bitmap we have starts at offset 0 so the next one is just
-         * at the end of the first bitmap.
-         */
-        next_bitmap_offset = (u64)(BITS_PER_BITMAP * 4096);
-
-        /* Test a bit straddling two bitmaps */
-        ret = add_free_space_entry(cache, next_bitmap_offset -
-                                   (2 * 1024 * 1024), 4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add space that straddles two bitmaps %d\n",
-                                ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, next_bitmap_offset -
-                                      (1 * 1024 * 1024), 2 * 1024 * 1024);
-        if (ret) {
-                test_msg("Couldn't remove overlapping space %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, next_bitmap_offset - (1 * 1024 * 1024),
-                         2 * 1024 * 1024)) {
-                test_msg("Left some space when removing overlapping\n");
-                return -1;
-        }
-
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-
-        return 0;
-}
-
-/* This is the high grade jackassery */
-static int test_bitmaps_and_extents(struct btrfs_block_group_cache *cache)
-{
-        u64 bitmap_offset = (u64)(BITS_PER_BITMAP * 4096);
-        int ret;
-
-        test_msg("Running bitmap and extent tests\n");
-
-        /*
-         * First let's do something simple, an extent at the same offset as the
-         * bitmap, but the free space completely in the extent and then
-         * completely in the bitmap.
-         */
-        ret = add_free_space_entry(cache, 4 * 1024 * 1024, 1 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't create bitmap entry %d\n", ret);
-                return ret;
-        }
-
-        ret = add_free_space_entry(cache, 0, 1 * 1024 * 1024, 0);
-        if (ret) {
-                test_msg("Couldn't add extent entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 0, 1 * 1024 * 1024);
-        if (ret) {
-                test_msg("Couldn't remove extent entry %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 0, 1 * 1024 * 1024)) {
-                test_msg("Left remnants after our remove\n");
-                return -1;
-        }
-
-        /* Now to add back the extent entry and remove from the bitmap */
-        ret = add_free_space_entry(cache, 0, 1 * 1024 * 1024, 0);
-        if (ret) {
-                test_msg("Couldn't re-add extent entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 4 * 1024 * 1024, 1 * 1024 * 1024);
-        if (ret) {
-                test_msg("Couldn't remove from bitmap %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 4 * 1024 * 1024, 1 * 1024 * 1024)) {
-                test_msg("Left remnants in the bitmap\n");
-                return -1;
-        }
-
-        /*
-         * Ok so a little more evil, extent entry and bitmap at the same offset,
-         * removing an overlapping chunk.
-         */
-        ret = add_free_space_entry(cache, 1 * 1024 * 1024, 4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add to a bitmap %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 512 * 1024, 3 * 1024 * 1024);
-        if (ret) {
-                test_msg("Couldn't remove overlapping space %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 512 * 1024, 3 * 1024 * 1024)) {
-                test_msg("Left over peices after removing overlapping\n");
-                return -1;
-        }
-
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-
-        /* Now with the extent entry offset into the bitmap */
-        ret = add_free_space_entry(cache, 4 * 1024 * 1024, 4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add space to the bitmap %d\n", ret);
-                return ret;
-        }
-
-        ret = add_free_space_entry(cache, 2 * 1024 * 1024, 2 * 1024 * 1024, 0);
-        if (ret) {
-                test_msg("Couldn't add extent to the cache %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 3 * 1024 * 1024, 4 * 1024 * 1024);
-        if (ret) {
-                test_msg("Problem removing overlapping space %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, 3 * 1024 * 1024, 4 * 1024 * 1024)) {
-                test_msg("Left something behind when removing space");
-                return -1;
-        }
-
-        /*
-         * This has blown up in the past, the extent entry starts before the
-         * bitmap entry, but we're trying to remove an offset that falls
-         * completely within the bitmap range and is in both the extent entry
-         * and the bitmap entry, looks like this
-         *
-         *   [ extent ]
-         *      [ bitmap ]
-         *        [ del ]
-         */
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-        ret = add_free_space_entry(cache, bitmap_offset + 4 * 1024 * 1024,
-                                   4 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add bitmap %d\n", ret);
-                return ret;
-        }
-
-        ret = add_free_space_entry(cache, bitmap_offset - 1 * 1024 * 1024,
-                                   5 * 1024 * 1024, 0);
-        if (ret) {
-                test_msg("Couldn't add extent entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, bitmap_offset + 1 * 1024 * 1024,
-                                      5 * 1024 * 1024);
-        if (ret) {
-                test_msg("Failed to free our space %d\n", ret);
-                return ret;
-        }
-
-        if (check_exists(cache, bitmap_offset + 1 * 1024 * 1024,
-                         5 * 1024 * 1024)) {
-                test_msg("Left stuff over\n");
-                return -1;
-        }
-
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-
-        /*
-         * This blew up before, we have part of the free space in a bitmap and
-         * then the entirety of the rest of the space in an extent.  This used
-         * to return -EAGAIN back from btrfs_remove_extent, make sure this
-         * doesn't happen.
-         */
-        ret = add_free_space_entry(cache, 1 * 1024 * 1024, 2 * 1024 * 1024, 1);
-        if (ret) {
-                test_msg("Couldn't add bitmap entry %d\n", ret);
-                return ret;
-        }
-
-        ret = add_free_space_entry(cache, 3 * 1024 * 1024, 1 * 1024 * 1024, 0);
-        if (ret) {
-                test_msg("Couldn't add extent entry %d\n", ret);
-                return ret;
-        }
-
-        ret = btrfs_remove_free_space(cache, 1 * 1024 * 1024, 3 * 1024 * 1024);
-        if (ret) {
-                test_msg("Error removing bitmap and extent overlapping %d\n", ret);
-                return ret;
-        }
-
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-        return 0;
-}
-
-void btrfs_test_free_space_cache(void)
-{
-        struct btrfs_block_group_cache *cache;
-
-        test_msg("Running btrfs free space cache tests\n");
-
-        cache = init_test_block_group();
-        if (!cache) {
-                test_msg("Couldn't run the tests\n");
-                return;
-        }
-
-        if (test_extents(cache))
-                goto out;
-        if (test_bitmaps(cache))
-                goto out;
-        if (test_bitmaps_and_extents(cache))
-                goto out;
-out:
-        __btrfs_remove_free_space_cache(cache->free_space_ctl);
-        kfree(cache->free_space_ctl);
-        kfree(cache);
-        test_msg("Free space cache tests finished\n");
-}
-#undef test_msg
-#else /* !CONFIG_BTRFS_FS_RUN_SANITY_TESTS */
-void btrfs_test_free_space_cache(void) {}
-#endif /* !CONFIG_BTRFS_FS_RUN_SANITY_TESTS */
+#endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */