linux-imx

/*

 *   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!",

            sb, (unsigned long long)blkno,

            (unsigned long long)nblocks, r);

    }

​

    jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d",

        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

     */