linux/fs/jfs/jfs_discard.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *   Copyright (C) Tino Reichardt, 2012
   4 */
   5
   6#include <linux/fs.h>
   7#include <linux/slab.h>
   8#include <linux/blkdev.h>
   9
  10#include "jfs_incore.h"
  11#include "jfs_superblock.h"
  12#include "jfs_discard.h"
  13#include "jfs_dmap.h"
  14#include "jfs_debug.h"
  15
  16
  17/*
  18 * NAME:        jfs_issue_discard()
  19 *
  20 * FUNCTION:    TRIM the specified block range on device, if supported
  21 *
  22 * PARAMETERS:
  23 *      ip      - pointer to in-core inode
  24 *      blkno   - starting block number to be trimmed (0..N)
  25 *      nblocks - number of blocks to be trimmed
  26 *
  27 * RETURN VALUES:
  28 *      none
  29 *
  30 * serialization: IREAD_LOCK(ipbmap) held on entry/exit;
  31 */
  32void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
  33{
  34        struct super_block *sb = ip->i_sb;
  35        int r = 0;
  36
  37        r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
  38        if (unlikely(r != 0)) {
  39                jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!",
  40                        sb, (unsigned long long)blkno,
  41                        (unsigned long long)nblocks, r);
  42        }
  43
  44        jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d",
  45                sb, (unsigned long long)blkno,
  46                (unsigned long long)nblocks, r);
  47
  48        return;
  49}
  50
  51/*
  52 * NAME:        jfs_ioc_trim()
  53 *
  54 * FUNCTION:    attempt to discard (TRIM) all free blocks from the
  55 *              filesystem.
  56 *
  57 * PARAMETERS:
  58 *      ip      - pointer to in-core inode;
  59 *      range   - the range, given by user space
  60 *
  61 * RETURN VALUES:
  62 *      0       - success
  63 *      -EIO    - i/o error
  64 */
  65int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
  66{
  67        struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
  68        struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
  69        struct super_block *sb = ipbmap->i_sb;
  70        int agno, agno_end;
  71        u64 start, end, minlen;
  72        u64 trimmed = 0;
  73
  74        /**
  75         * convert byte values to block size of filesystem:
  76         * start:       First Byte to trim
  77         * len:         number of Bytes to trim from start
  78         * minlen:      minimum extent length in Bytes
  79         */
  80        start = range->start >> sb->s_blocksize_bits;
  81        end = start + (range->len >> sb->s_blocksize_bits) - 1;
  82        minlen = range->minlen >> sb->s_blocksize_bits;
  83        if (minlen == 0)
  84                minlen = 1;
  85
  86        if (minlen > bmp->db_agsize ||
  87            start >= bmp->db_mapsize ||
  88            range->len < sb->s_blocksize)
  89                return -EINVAL;
  90
  91        if (end >= bmp->db_mapsize)
  92                end = bmp->db_mapsize - 1;
  93
  94        /**
  95         * we trim all ag's within the range
  96         */
  97        agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
  98        agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
  99        while (agno <= agno_end) {
 100                trimmed += dbDiscardAG(ip, agno, minlen);
 101                agno++;
 102        }
 103        range->len = trimmed << sb->s_blocksize_bits;
 104
 105        return 0;
 106}
 107