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Commit 6a3891c5 authored by Josef Bacik's avatar Josef Bacik
Browse files

Btrfs: add sanity test for outstanding_extents accounting 



I introduced a regression wrt outstanding_extents accounting.  These are tricky
areas that aren't easily covered by xfstests as we could change MAX_EXTENT_SIZE
at any time.  So add sanity tests to cover the various conditions that are
tricky in order to make sure we don't introduce regressions in the future.
Thanks,

Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
parent bcb7e449

fs/btrfs/ctree.h

+3 −0
Original line number Diff line number Diff line
@@ -3910,6 +3910,9 @@ int btrfs_prealloc_file_range_trans(struct inode *inode, 
				    loff_t actual_len, u64 *alloc_hint);

int btrfs_inode_check_errors(struct inode *inode);

extern const struct dentry_operations btrfs_dentry_operations;

#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS

void btrfs_test_inode_set_ops(struct inode *inode);

#endif



/* ioctl.c */

long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

fs/btrfs/extent-tree.c

+3 −0
Original line number Diff line number Diff line
@@ -5285,6 +5285,9 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) 
	if (dropped > 0)

		to_free += btrfs_calc_trans_metadata_size(root, dropped);



	if (btrfs_test_is_dummy_root(root))

		return;



	trace_btrfs_space_reservation(root->fs_info, "delalloc",

				      btrfs_ino(inode), to_free, 0);

	if (root->fs_info->quota_enabled) {

fs/btrfs/inode.c

+15 −0
Original line number Diff line number Diff line
@@ -108,6 +108,13 @@ static struct extent_map *create_pinned_em(struct inode *inode, u64 start, 


static int btrfs_dirty_inode(struct inode *inode);



#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS

void btrfs_test_inode_set_ops(struct inode *inode)

{

	BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;

}

#endif



static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,

				     struct inode *inode,  struct inode *dir,

				     const struct qstr *qstr)
@@ -1694,6 +1701,10 @@ static void btrfs_set_bit_hook(struct inode *inode, 
			spin_unlock(&BTRFS_I(inode)->lock);

		}



		/* For sanity tests */

		if (btrfs_test_is_dummy_root(root))

			return;



		__percpu_counter_add(&root->fs_info->delalloc_bytes, len,

				     root->fs_info->delalloc_batch);

		spin_lock(&BTRFS_I(inode)->lock);
@@ -1749,6 +1760,10 @@ static void btrfs_clear_bit_hook(struct inode *inode, 
		    root != root->fs_info->tree_root)

			btrfs_delalloc_release_metadata(inode, len);



		/* For sanity tests. */

		if (btrfs_test_is_dummy_root(root))

			return;



		if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID

		    && do_list && !(state->state & EXTENT_NORESERVE))

			btrfs_free_reserved_data_space(inode, len);

fs/btrfs/tests/inode-tests.c

+196 −1
Original line number Diff line number Diff line
@@ -911,6 +911,197 @@ static int test_hole_first(void) 
	return ret;

}



static int test_extent_accounting(void)

{

	struct inode *inode = NULL;

	struct btrfs_root *root = NULL;

	int ret = -ENOMEM;



	inode = btrfs_new_test_inode();

	if (!inode) {

		test_msg("Couldn't allocate inode\n");

		return ret;

	}



	root = btrfs_alloc_dummy_root();

	if (IS_ERR(root)) {

		test_msg("Couldn't allocate root\n");

		goto out;

	}



	root->fs_info = btrfs_alloc_dummy_fs_info();

	if (!root->fs_info) {

		test_msg("Couldn't allocate dummy fs info\n");

		goto out;

	}



	BTRFS_I(inode)->root = root;

	btrfs_test_inode_set_ops(inode);



	/* [BTRFS_MAX_EXTENT_SIZE] */

	BTRFS_I(inode)->outstanding_extents++;

	ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1,

					NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 1) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 1, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* [BTRFS_MAX_EXTENT_SIZE][4k] */

	BTRFS_I(inode)->outstanding_extents++;

	ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,

					BTRFS_MAX_EXTENT_SIZE + 4095, NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 2) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 2, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* [BTRFS_MAX_EXTENT_SIZE/2][4K HOLE][the rest] */

	ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,

			       BTRFS_MAX_EXTENT_SIZE >> 1,

			       (BTRFS_MAX_EXTENT_SIZE >> 1) + 4095,

			       EXTENT_DELALLOC | EXTENT_DIRTY |

			       EXTENT_UPTODATE | EXTENT_DO_ACCOUNTING, 0, 0,

			       NULL, GFP_NOFS);

	if (ret) {

		test_msg("clear_extent_bit returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 2) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 2, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* [BTRFS_MAX_EXTENT_SIZE][4K] */

	BTRFS_I(inode)->outstanding_extents++;

	ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,

					(BTRFS_MAX_EXTENT_SIZE >> 1) + 4095,

					NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 2) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 2, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/*

	 * [BTRFS_MAX_EXTENT_SIZE+4K][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4K]

	 *

	 * I'm artificially adding 2 to outstanding_extents because in the

	 * buffered IO case we'd add things up as we go, but I don't feel like

	 * doing that here, this isn't the interesting case we want to test.

	 */

	BTRFS_I(inode)->outstanding_extents += 2;

	ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE + 8192,

					(BTRFS_MAX_EXTENT_SIZE << 1) + 12287,

					NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 4) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 4, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* [BTRFS_MAX_EXTENT_SIZE+4k][4k][BTRFS_MAX_EXTENT_SIZE+4k] */

	BTRFS_I(inode)->outstanding_extents++;

	ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE+4096,

					BTRFS_MAX_EXTENT_SIZE+8191, NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 3) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 3, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */

	ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,

			       BTRFS_MAX_EXTENT_SIZE+4096,

			       BTRFS_MAX_EXTENT_SIZE+8191,

			       EXTENT_DIRTY | EXTENT_DELALLOC |

			       EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,

			       NULL, GFP_NOFS);

	if (ret) {

		test_msg("clear_extent_bit returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 4) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 4, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/*

	 * Refill the hole again just for good measure, because I thought it

	 * might fail and I'd rather satisfy my paranoia at this point.

	 */

	BTRFS_I(inode)->outstanding_extents++;

	ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE+4096,

					BTRFS_MAX_EXTENT_SIZE+8191, NULL);

	if (ret) {

		test_msg("btrfs_set_extent_delalloc returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents != 3) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 3, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}



	/* Empty */

	ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,

			       EXTENT_DIRTY | EXTENT_DELALLOC |

			       EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,

			       NULL, GFP_NOFS);

	if (ret) {

		test_msg("clear_extent_bit returned %d\n", ret);

		goto out;

	}

	if (BTRFS_I(inode)->outstanding_extents) {

		ret = -EINVAL;

		test_msg("Miscount, wanted 0, got %u\n",

			 BTRFS_I(inode)->outstanding_extents);

		goto out;

	}

	ret = 0;

out:

	if (ret)

		clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,

				 EXTENT_DIRTY | EXTENT_DELALLOC |

				 EXTENT_DO_ACCOUNTING | EXTENT_UPTODATE, 0, 0,

				 NULL, GFP_NOFS);

	iput(inode);

	btrfs_free_dummy_root(root);

	return ret;

}



int btrfs_test_inodes(void)

{

	int ret;
@@ -924,5 +1115,9 @@ int btrfs_test_inodes(void) 
	if (ret)

		return ret;

	test_msg("Running hole first btrfs_get_extent test\n");

	return test_hole_first();

	ret = test_hole_first();

	if (ret)

		return ret;

	test_msg("Running outstanding_extents tests\n");

	return test_extent_accounting();

}