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Commit b6a758ec authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
Browse files

ext4: move ext4_mb_init_group() function earlier in the mballoc.c 



This moves the function around so that it can be called from
ext4_mb_load_buddy().

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 91ac6f43

fs/ext4/mballoc.c

+91 −91
Original line number Diff line number Diff line
@@ -910,6 +910,97 @@ static int ext4_mb_init_cache(struct page *page, char *incore) 
	return err;

}



static noinline_for_stack

int ext4_mb_init_group(struct super_block *sb, ext4_group_t group)

{



	int ret = 0;

	void *bitmap;

	int blocks_per_page;

	int block, pnum, poff;

	int num_grp_locked = 0;

	struct ext4_group_info *this_grp;

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	struct inode *inode = sbi->s_buddy_cache;

	struct page *page = NULL, *bitmap_page = NULL;



	mb_debug(1, "init group %u\n", group);

	blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;

	this_grp = ext4_get_group_info(sb, group);

	/*

	 * This ensures we don't add group

	 * to this buddy cache via resize

	 */

	num_grp_locked =  ext4_mb_get_buddy_cache_lock(sb, group);

	if (!EXT4_MB_GRP_NEED_INIT(this_grp)) {

		/*

		 * somebody initialized the group

		 * return without doing anything

		 */

		ret = 0;

		goto err;

	}

	/*

	 * the buddy cache inode stores the block bitmap

	 * and buddy information in consecutive blocks.

	 * So for each group we need two blocks.

	 */

	block = group * 2;

	pnum = block / blocks_per_page;

	poff = block % blocks_per_page;

	page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);

	if (page) {

		BUG_ON(page->mapping != inode->i_mapping);

		ret = ext4_mb_init_cache(page, NULL);

		if (ret) {

			unlock_page(page);

			goto err;

		}

		unlock_page(page);

	}

	if (page == NULL || !PageUptodate(page)) {

		ret = -EIO;

		goto err;

	}

	mark_page_accessed(page);

	bitmap_page = page;

	bitmap = page_address(page) + (poff * sb->s_blocksize);



	/* init buddy cache */

	block++;

	pnum = block / blocks_per_page;

	poff = block % blocks_per_page;

	page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);

	if (page == bitmap_page) {

		/*

		 * If both the bitmap and buddy are in

		 * the same page we don't need to force

		 * init the buddy

		 */

		unlock_page(page);

	} else if (page) {

		BUG_ON(page->mapping != inode->i_mapping);

		ret = ext4_mb_init_cache(page, bitmap);

		if (ret) {

			unlock_page(page);

			goto err;

		}

		unlock_page(page);

	}

	if (page == NULL || !PageUptodate(page)) {

		ret = -EIO;

		goto err;

	}

	mark_page_accessed(page);

err:

	ext4_mb_put_buddy_cache_lock(sb, group, num_grp_locked);

	if (bitmap_page)

		page_cache_release(bitmap_page);

	if (page)

		page_cache_release(page);

	return ret;

}



static noinline_for_stack int

ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,

					struct ext4_buddy *e4b)
@@ -1839,97 +1930,6 @@ void ext4_mb_put_buddy_cache_lock(struct super_block *sb, 


}



static noinline_for_stack

int ext4_mb_init_group(struct super_block *sb, ext4_group_t group)

{



	int ret;

	void *bitmap;

	int blocks_per_page;

	int block, pnum, poff;

	int num_grp_locked = 0;

	struct ext4_group_info *this_grp;

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	struct inode *inode = sbi->s_buddy_cache;

	struct page *page = NULL, *bitmap_page = NULL;



	mb_debug(1, "init group %u\n", group);

	blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;

	this_grp = ext4_get_group_info(sb, group);

	/*

	 * This ensures we don't add group

	 * to this buddy cache via resize

	 */

	num_grp_locked =  ext4_mb_get_buddy_cache_lock(sb, group);

	if (!EXT4_MB_GRP_NEED_INIT(this_grp)) {

		/*

		 * somebody initialized the group

		 * return without doing anything

		 */

		ret = 0;

		goto err;

	}

	/*

	 * the buddy cache inode stores the block bitmap

	 * and buddy information in consecutive blocks.

	 * So for each group we need two blocks.

	 */

	block = group * 2;

	pnum = block / blocks_per_page;

	poff = block % blocks_per_page;

	page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);

	if (page) {

		BUG_ON(page->mapping != inode->i_mapping);

		ret = ext4_mb_init_cache(page, NULL);

		if (ret) {

			unlock_page(page);

			goto err;

		}

		unlock_page(page);

	}

	if (page == NULL || !PageUptodate(page)) {

		ret = -EIO;

		goto err;

	}

	mark_page_accessed(page);

	bitmap_page = page;

	bitmap = page_address(page) + (poff * sb->s_blocksize);



	/* init buddy cache */

	block++;

	pnum = block / blocks_per_page;

	poff = block % blocks_per_page;

	page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);

	if (page == bitmap_page) {

		/*

		 * If both the bitmap and buddy are in

		 * the same page we don't need to force

		 * init the buddy

		 */

		unlock_page(page);

	} else if (page) {

		BUG_ON(page->mapping != inode->i_mapping);

		ret = ext4_mb_init_cache(page, bitmap);

		if (ret) {

			unlock_page(page);

			goto err;

		}

		unlock_page(page);

	}

	if (page == NULL || !PageUptodate(page)) {

		ret = -EIO;

		goto err;

	}

	mark_page_accessed(page);

err:

	ext4_mb_put_buddy_cache_lock(sb, group, num_grp_locked);

	if (bitmap_page)

		page_cache_release(bitmap_page);

	if (page)

		page_cache_release(page);

	return ret;

}



static noinline_for_stack int

ext4_mb_regular_allocator(struct ext4_allocation_context *ac)

{