Commit 6c41761f authored by David Sterba's avatar David Sterba Committed by Chris Mason
Browse files

btrfs: separate superblock items out of fs_info 



fs_info has now ~9kb, more than fits into one page. This will cause
mount failure when memory is too fragmented. Top space consumers are
super block structures super_copy and super_for_commit, ~2.8kb each.
Allocate them dynamically. fs_info will be ~3.5kb. (measured on x86_64)

Add a wrapper for freeing fs_info and all of it's dynamically allocated
members.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
parent c8174313

fs/btrfs/compression.c

+2 −1
Original line number Diff line number Diff line
@@ -85,7 +85,8 @@ struct compressed_bio { 
static inline int compressed_bio_size(struct btrfs_root *root,

				      unsigned long disk_size)

{

	u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);



	return sizeof(struct compressed_bio) +

		((disk_size + root->sectorsize - 1) / root->sectorsize) *

		csum_size;

fs/btrfs/ctree.h

+14 −2
Original line number Diff line number Diff line
@@ -936,8 +936,8 @@ struct btrfs_fs_info { 
	wait_queue_head_t transaction_blocked_wait;

	wait_queue_head_t async_submit_wait;



	struct btrfs_super_block super_copy;

	struct btrfs_super_block super_for_commit;

	struct btrfs_super_block *super_copy;

	struct btrfs_super_block *super_for_commit;

	struct block_device *__bdev;

	struct super_block *sb;

	struct inode *btree_inode;
@@ -2387,6 +2387,18 @@ static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 
	smp_mb();

	return fs_info->closing;

}

static inline void free_fs_info(struct btrfs_fs_info *fs_info)

{

	kfree(fs_info->delayed_root);

	kfree(fs_info->extent_root);

	kfree(fs_info->tree_root);

	kfree(fs_info->chunk_root);

	kfree(fs_info->dev_root);

	kfree(fs_info->csum_root);

	kfree(fs_info->super_copy);

	kfree(fs_info->super_for_commit);

	kfree(fs_info);

}



/* root-item.c */

int btrfs_find_root_ref(struct btrfs_root *tree_root,

fs/btrfs/disk-io.c

+10 −23
Original line number Diff line number Diff line
@@ -256,8 +256,7 @@ void btrfs_csum_final(u32 crc, char *result) 
static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,

			   int verify)

{

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);

	char *result = NULL;

	unsigned long len;

	unsigned long cur_len;
@@ -1766,14 +1765,14 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
		goto fail_alloc;

	}



	memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));

	memcpy(&fs_info->super_for_commit, &fs_info->super_copy,

	       sizeof(fs_info->super_for_commit));

	memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));

	memcpy(fs_info->super_for_commit, fs_info->super_copy,

	       sizeof(*fs_info->super_for_commit));

	brelse(bh);



	memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);

	memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);



	disk_super = &fs_info->super_copy;

	disk_super = fs_info->super_copy;

	if (!btrfs_super_root(disk_super))

		goto fail_alloc;
@@ -2152,7 +2151,6 @@ fail_sb_buffer: 
	btrfs_stop_workers(&fs_info->delayed_workers);

	btrfs_stop_workers(&fs_info->caching_workers);

fail_alloc:

	kfree(fs_info->delayed_root);

fail_iput:

	invalidate_inode_pages2(fs_info->btree_inode->i_mapping);

	iput(fs_info->btree_inode);
@@ -2164,12 +2162,7 @@ fail_bdi: 
fail_srcu:

	cleanup_srcu_struct(&fs_info->subvol_srcu);

fail:

	kfree(extent_root);

	kfree(tree_root);

	kfree(fs_info);

	kfree(chunk_root);

	kfree(dev_root);

	kfree(csum_root);

	free_fs_info(fs_info);

	return ERR_PTR(err);

}
@@ -2338,10 +2331,10 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) 
	int total_errors = 0;

	u64 flags;



	max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;

	max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1;

	do_barriers = !btrfs_test_opt(root, NOBARRIER);



	sb = &root->fs_info->super_for_commit;

	sb = root->fs_info->super_for_commit;

	dev_item = &sb->dev_item;



	mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
@@ -2603,7 +2596,6 @@ int close_ctree(struct btrfs_root *root) 
	del_fs_roots(fs_info);



	iput(fs_info->btree_inode);

	kfree(fs_info->delayed_root);



	btrfs_stop_workers(&fs_info->generic_worker);

	btrfs_stop_workers(&fs_info->fixup_workers);
@@ -2624,12 +2616,7 @@ int close_ctree(struct btrfs_root *root) 
	bdi_destroy(&fs_info->bdi);

	cleanup_srcu_struct(&fs_info->subvol_srcu);



	kfree(fs_info->extent_root);

	kfree(fs_info->tree_root);

	kfree(fs_info->chunk_root);

	kfree(fs_info->dev_root);

	kfree(fs_info->csum_root);

	kfree(fs_info);

	free_fs_info(fs_info);



	return 0;

}

fs/btrfs/extent-tree.c

+8 −8
Original line number Diff line number Diff line
@@ -3209,7 +3209,7 @@ static int should_alloc_chunk(struct btrfs_root *root, 
	 * about 1% of the FS size.

	 */

	if (force == CHUNK_ALLOC_LIMITED) {

		thresh = btrfs_super_total_bytes(&root->fs_info->super_copy);

		thresh = btrfs_super_total_bytes(root->fs_info->super_copy);

		thresh = max_t(u64, 64 * 1024 * 1024,

			       div_factor_fine(thresh, 1));
@@ -3231,7 +3231,7 @@ static int should_alloc_chunk(struct btrfs_root *root, 
	if (num_allocated + alloc_bytes < div_factor(num_bytes, 8))

		return 0;



	thresh = btrfs_super_total_bytes(&root->fs_info->super_copy);

	thresh = btrfs_super_total_bytes(root->fs_info->super_copy);



	/* 256MB or 5% of the FS */

	thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5));
@@ -3843,7 +3843,7 @@ static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) 
	u64 num_bytes;

	u64 meta_used;

	u64 data_used;

	int csum_size = btrfs_super_csum_size(&fs_info->super_copy);

	int csum_size = btrfs_super_csum_size(fs_info->super_copy);



	sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA);

	spin_lock(&sinfo->lock);
@@ -4222,12 +4222,12 @@ static int update_block_group(struct btrfs_trans_handle *trans, 


	/* block accounting for super block */

	spin_lock(&info->delalloc_lock);

	old_val = btrfs_super_bytes_used(&info->super_copy);

	old_val = btrfs_super_bytes_used(info->super_copy);

	if (alloc)

		old_val += num_bytes;

	else

		old_val -= num_bytes;

	btrfs_set_super_bytes_used(&info->super_copy, old_val);

	btrfs_set_super_bytes_used(info->super_copy, old_val);

	spin_unlock(&info->delalloc_lock);



	while (total) {
@@ -7127,9 +7127,9 @@ int btrfs_read_block_groups(struct btrfs_root *root) 
		return -ENOMEM;

	path->reada = 1;



	cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy);

	cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);

	if (btrfs_test_opt(root, SPACE_CACHE) &&

	    btrfs_super_generation(&root->fs_info->super_copy) != cache_gen)

	    btrfs_super_generation(root->fs_info->super_copy) != cache_gen)

		need_clear = 1;

	if (btrfs_test_opt(root, CLEAR_CACHE))

		need_clear = 1;
@@ -7458,7 +7458,7 @@ int btrfs_init_space_info(struct btrfs_fs_info *fs_info) 
	int mixed = 0;

	int ret;



	disk_super = &fs_info->super_copy;

	disk_super = fs_info->super_copy;

	if (!btrfs_super_root(disk_super))

		return 1;

fs/btrfs/file-item.c

+6 −11
Original line number Diff line number Diff line
@@ -91,8 +91,7 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, 
	struct btrfs_csum_item *item;

	struct extent_buffer *leaf;

	u64 csum_offset = 0;

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);

	int csums_in_item;



	file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
@@ -162,8 +161,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root, 
	u64 item_last_offset = 0;

	u64 disk_bytenr;

	u32 diff;

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);

	int ret;

	struct btrfs_path *path;

	struct btrfs_csum_item *item = NULL;
@@ -290,7 +288,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 
	int ret;

	size_t size;

	u64 csum_end;

	u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);



	path = btrfs_alloc_path();

	if (!path)
@@ -492,8 +490,7 @@ static noinline int truncate_one_csum(struct btrfs_trans_handle *trans, 
				      u64 bytenr, u64 len)

{

	struct extent_buffer *leaf;

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);

	u64 csum_end;

	u64 end_byte = bytenr + len;

	u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
@@ -549,8 +546,7 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, 
	u64 csum_end;

	struct extent_buffer *leaf;

	int ret;

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);

	int blocksize_bits = root->fs_info->sb->s_blocksize_bits;



	root = root->fs_info->csum_root;
@@ -676,8 +672,7 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 
	struct btrfs_sector_sum *sector_sum;

	u32 nritems;

	u32 ins_size;

	u16 csum_size =

		btrfs_super_csum_size(&root->fs_info->super_copy);

	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);



	path = btrfs_alloc_path();

	if (!path)

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