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authorJosef Bacik <jbacik@fb.com>2015-09-23 14:54:14 -0400
committerChris Mason <clm@fb.com>2015-10-21 18:51:43 -0700
commitd0bd456074dca089579818312da7cbe726ad2ff9 (patch)
tree6dcb3498d7b964a19562dccf8322483359ede3ef /fs/btrfs/tests
parentd9ee522ba3ab51b7e3c6dfcf3743216371bc810f (diff)
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 <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/tests')
-rw-r--r--fs/btrfs/tests/free-space-tests.c22
1 files changed, 21 insertions, 1 deletions
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 <linux/slab.h>
#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;
}