Commit 1ada3a62 authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: extent-tree: Add new version of btrfs_delalloc_reserve/release_space 



Add new version of btrfs_delalloc_reserve_space() and
btrfs_delalloc_release_space() functions, which supports accurate qgroup
reserve.

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent d9d8b2a5

fs/btrfs/ctree.h

+2 −0
Original line number Diff line number Diff line
@@ -3473,7 +3473,9 @@ void btrfs_subvolume_release_metadata(struct btrfs_root *root, 
int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);

void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);

int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);

int __btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len);

void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);

void __btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len);

void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);

struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,

					      unsigned short type);

fs/btrfs/extent-tree.c

+59 −0
Original line number Diff line number Diff line
@@ -5714,6 +5714,44 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) 
				to_free);

}



/**

 * __btrfs_delalloc_reserve_space - reserve data and metadata space for

 * delalloc

 * @inode: inode we're writing to

 * @start: start range we are writing to

 * @len: how long the range we are writing to

 *

 * TODO: This function will finally replace old btrfs_delalloc_reserve_space()

 *

 * This will do the following things

 *

 * o reserve space in data space info for num bytes

 *   and reserve precious corresponding qgroup space

 *   (Done in check_data_free_space)

 *

 * o reserve space for metadata space, based on the number of outstanding

 *   extents and how much csums will be needed

 *   also reserve metadata space in a per root over-reserve method.

 * o add to the inodes->delalloc_bytes

 * o add it to the fs_info's delalloc inodes list.

 *   (Above 3 all done in delalloc_reserve_metadata)

 *

 * Return 0 for success

 * Return <0 for error(-ENOSPC or -EQUOT)

 */

int __btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len)

{

	int ret;



	ret = __btrfs_check_data_free_space(inode, start, len);

	if (ret < 0)

		return ret;

	ret = btrfs_delalloc_reserve_metadata(inode, len);

	if (ret < 0)

		__btrfs_free_reserved_data_space(inode, start, len);

	return ret;

}



/**

 * btrfs_delalloc_reserve_space - reserve data and metadata space for delalloc

 * @inode: inode we're writing to
@@ -5746,6 +5784,27 @@ int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes) 
	return 0;

}



/**

 * __btrfs_delalloc_release_space - release data and metadata space for delalloc

 * @inode: inode we're releasing space for

 * @start: start position of the space already reserved

 * @len: the len of the space already reserved

 *

 * This must be matched with a call to btrfs_delalloc_reserve_space.  This is

 * called in the case that we don't need the metadata AND data reservations

 * anymore.  So if there is an error or we insert an inline extent.

 *

 * This function will release the metadata space that was not used and will

 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes

 * list if there are no delalloc bytes left.

 * Also it will handle the qgroup reserved space.

 */

void __btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len)

{

	btrfs_delalloc_release_metadata(inode, len);

	__btrfs_free_reserved_data_space(inode, start, len);

}



/**

 * btrfs_delalloc_release_space - release data and metadata space for delalloc

 * @inode: inode we're releasing space for