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Btrfs: add a sanity test for a vacant extent at the front of a file

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Btrfs_get_extent was not handling this case properly, add a test to make sure we
don't regress.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Josef Bacik 2013-10-14 13:15:02 -04:00 committed by Chris Mason
parent 25a50341b6
commit 0e30db86a4
1 changed files with 128 additions and 5 deletions
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133
fs/btrfs/tests/inode-tests.c
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@ -86,6 +86,26 @@ static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
btrfs_set_file_extent_other_encoding(leaf, fi, 0);
}
static void insert_inode_item_key(struct btrfs_root *root)
{
struct btrfs_path path;
struct extent_buffer *leaf = root->node;
struct btrfs_key key;
u32 value_len = 0;
memset(&path, 0, sizeof(path));
path.nodes[0] = leaf;
path.slots[0] = 0;
key.objectid = BTRFS_INODE_ITEM_KEY;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
setup_items_for_insert(root, &path, &key, &value_len, value_len,
value_len + sizeof(struct btrfs_item), 1);
}
/*
* Build the most complicated map of extents the earth has ever seen. We want
* this so we can test all of the corner cases of btrfs_get_extent. Here is a
@ -236,10 +256,6 @@ static noinline int test_btrfs_get_extent(void)
u64 offset;
int ret = -ENOMEM;
set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Couldn't allocate inode\n");
@ -825,8 +841,115 @@ out:
return ret;
}
static int test_hole_first(void)
{
struct inode *inode = NULL;
struct btrfs_root *root = NULL;
struct extent_map *em = NULL;
int ret = -ENOMEM;
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Couldn't allocate inode\n");
return ret;
}
BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
BTRFS_I(inode)->location.offset = 0;
root = btrfs_alloc_dummy_root();
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
root->fs_info = alloc_dummy_fs_info();
if (!root->fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root->node = alloc_dummy_extent_buffer(0, 4096);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
goto out;
}
extent_buffer_get(root->node);
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
BTRFS_I(inode)->root = root;
ret = -EINVAL;
/*
* Need a blank inode item here just so we don't confuse
* btrfs_get_extent.
*/
insert_inode_item_key(root);
insert_extent(root, 4096, 4096, 4096, 0, 4096, 4096,
BTRFS_FILE_EXTENT_REG, 0, 1);
em = btrfs_get_extent(inode, NULL, 0, 0, 8192, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (em->start != 0 || em->len != 4096) {
test_msg("Unexpected extent wanted start 0 len 4096, got start "
"%llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != vacancy_only) {
test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,
em->flags);
goto out;
}
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, 4096, 8192, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != 4096) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != 4096 || em->len != 4096) {
test_msg("Unexpected extent wanted start 4096 len 4096, got "
"start %llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, wanted 0 got %lu\n",
em->flags);
goto out;
}
ret = 0;
out:
if (!IS_ERR(em))
free_extent_map(em);
iput(inode);
free_dummy_root(root);
return ret;
}
int btrfs_test_inodes(void)
{
int ret;
set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
test_msg("Running btrfs_get_extent tests\n");
return test_btrfs_get_extent();
ret = test_btrfs_get_extent();
if (ret)
return ret;
test_msg("Running hole first btrfs_get_extent test\n");
return test_hole_first();
}