[linux-2.6-block.git] / fs / jfs / jfs_discard.c

/*
 *   Copyright (C) Tino Reichardt, 2012
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/blkdev.h>

#include "jfs_incore.h"
#include "jfs_superblock.h"
#include "jfs_discard.h"
#include "jfs_dmap.h"
#include "jfs_debug.h"


/*
 * NAME:	jfs_issue_discard()
 *
 * FUNCTION:	TRIM the specified block range on device, if supported
 *
 * PARAMETERS:
 *	ip	- pointer to in-core inode
 *	blkno	- starting block number to be trimmed (0..N)
 *	nblocks	- number of blocks to be trimmed
 *
 * RETURN VALUES:
 *	none
 *
 * serialization: IREAD_LOCK(ipbmap) held on entry/exit;
 */
void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
{
	struct super_block *sb = ip->i_sb;
	int r = 0;

	r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
	if (unlikely(r != 0)) {
		jfs_err("JFS: sb_issue_discard" \
			"(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!\n",
			sb, (unsigned long long)blkno,
			(unsigned long long)nblocks, r);
	}

	jfs_info("JFS: sb_issue_discard" \
		"(%p, %llu, %llu, GFP_NOFS, 0) = %d\n",
		sb, (unsigned long long)blkno,
		(unsigned long long)nblocks, r);

	return;
}

/*
 * NAME:	jfs_ioc_trim()
 *
 * FUNCTION:	attempt to discard (TRIM) all free blocks from the
 *              filesystem.
 *
 * PARAMETERS:
 *	ip	- pointer to in-core inode;
 *	range	- the range, given by user space
 *
 * RETURN VALUES:
 *	0	- success
 *	-EIO	- i/o error
 */
int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
{
	struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
	struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
	struct super_block *sb = ipbmap->i_sb;
	int agno, agno_end;
	u64 start, end, minlen;
	u64 trimmed = 0;

	/**
	 * convert byte values to block size of filesystem:
	 * start:	First Byte to trim
	 * len:		number of Bytes to trim from start
	 * minlen:	minimum extent length in Bytes
	 */
	start = range->start >> sb->s_blocksize_bits;
	end = start + (range->len >> sb->s_blocksize_bits) - 1;
	minlen = range->minlen >> sb->s_blocksize_bits;
	if (minlen == 0)
		minlen = 1;

	if (minlen > bmp->db_agsize ||
	    start >= bmp->db_mapsize ||
	    range->len < sb->s_blocksize)
		return -EINVAL;

	if (end >= bmp->db_mapsize)
		end = bmp->db_mapsize - 1;

	/**
	 * we trim all ag's within the range
	 */
	agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
	agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
	while (agno <= agno_end) {
		trimmed += dbDiscardAG(ip, agno, minlen);
		agno++;
	}
	range->len = trimmed << sb->s_blocksize_bits;

	return 0;
}
Commit	Line	Data
b40c2e66 TR	1	/*
	2	* Copyright (C) Tino Reichardt, 2012
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	12	* the GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18
	19	#include <linux/fs.h>
	20	#include <linux/slab.h>
	21	#include <linux/blkdev.h>
	22
	23	#include "jfs_incore.h"
	24	#include "jfs_superblock.h"
	25	#include "jfs_discard.h"
	26	#include "jfs_dmap.h"
	27	#include "jfs_debug.h"
	28
	29
	30	/*
	31	* NAME: jfs_issue_discard()
	32	*
	33	* FUNCTION: TRIM the specified block range on device, if supported
	34	*
	35	* PARAMETERS:
	36	* ip - pointer to in-core inode
	37	* blkno - starting block number to be trimmed (0..N)
	38	* nblocks - number of blocks to be trimmed
	39	*
	40	* RETURN VALUES:
	41	* none
	42	*
	43	* serialization: IREAD_LOCK(ipbmap) held on entry/exit;
	44	*/
	45	void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
	46	{
	47	struct super_block *sb = ip->i_sb;
	48	int r = 0;
	49
	50	r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
	51	if (unlikely(r != 0)) {
	52	jfs_err("JFS: sb_issue_discard" \
	53	"(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!\n",
	54	sb, (unsigned long long)blkno,
	55	(unsigned long long)nblocks, r);
	56	}
	57
	58	jfs_info("JFS: sb_issue_discard" \
	59	"(%p, %llu, %llu, GFP_NOFS, 0) = %d\n",
	60	sb, (unsigned long long)blkno,
	61	(unsigned long long)nblocks, r);
	62
	63	return;
	64	}
65
66	/*
67	* NAME: jfs_ioc_trim()
68	*
69	* FUNCTION: attempt to discard (TRIM) all free blocks from the
70	* filesystem.
71	*
72	* PARAMETERS:
73	* ip - pointer to in-core inode;
74	* range - the range, given by user space
75	*
76	* RETURN VALUES:
77	* 0 - success
78	* -EIO - i/o error
79	*/
80	int jfs_ioc_trim(struct inode ip, struct fstrim_range range)
81	{
82	struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
83	struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
84	struct super_block *sb = ipbmap->i_sb;
85	int agno, agno_end;
4e7a4b01	86	u64 start, end, minlen;
b40c2e66 TR	87	u64 trimmed = 0;
	88
	89	/**
	90	* convert byte values to block size of filesystem:
	91	* start: First Byte to trim
	92	* len: number of Bytes to trim from start
	93	* minlen: minimum extent length in Bytes
	94	*/
	95	start = range->start >> sb->s_blocksize_bits;
b40c2e66	96	end = start + (range->len >> sb->s_blocksize_bits) - 1;
b40c2e66	97	minlen = range->minlen >> sb->s_blocksize_bits;
4e7a4b01	98	if (minlen == 0)
b40c2e66 TR	99	minlen = 1;
b40c2e66 TR	100
4e7a4b01 LC	101	if (minlen > bmp->db_agsize \|\|
	102	start >= bmp->db_mapsize \|\|
	103	range->len < sb->s_blocksize)
	104	return -EINVAL;
	105
	106	if (end >= bmp->db_mapsize)
	107	end = bmp->db_mapsize - 1;
	108
b40c2e66 TR	109	/**
	110	* we trim all ag's within the range
	111	*/
	112	agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
	113	agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
	114	while (agno <= agno_end) {
	115	trimmed += dbDiscardAG(ip, agno, minlen);
	116	agno++;
	117	}
	118	range->len = trimmed << sb->s_blocksize_bits;
	119
	120	return 0;
	121	}