1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) Tino Reichardt, 2012
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/fs.h>
7*4882a593Smuzhiyun #include <linux/slab.h>
8*4882a593Smuzhiyun #include <linux/blkdev.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "jfs_incore.h"
11*4882a593Smuzhiyun #include "jfs_superblock.h"
12*4882a593Smuzhiyun #include "jfs_discard.h"
13*4882a593Smuzhiyun #include "jfs_dmap.h"
14*4882a593Smuzhiyun #include "jfs_debug.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /*
18*4882a593Smuzhiyun * NAME: jfs_issue_discard()
19*4882a593Smuzhiyun *
20*4882a593Smuzhiyun * FUNCTION: TRIM the specified block range on device, if supported
21*4882a593Smuzhiyun *
22*4882a593Smuzhiyun * PARAMETERS:
23*4882a593Smuzhiyun * ip - pointer to in-core inode
24*4882a593Smuzhiyun * blkno - starting block number to be trimmed (0..N)
25*4882a593Smuzhiyun * nblocks - number of blocks to be trimmed
26*4882a593Smuzhiyun *
27*4882a593Smuzhiyun * RETURN VALUES:
28*4882a593Smuzhiyun * none
29*4882a593Smuzhiyun *
30*4882a593Smuzhiyun * serialization: IREAD_LOCK(ipbmap) held on entry/exit;
31*4882a593Smuzhiyun */
jfs_issue_discard(struct inode * ip,u64 blkno,u64 nblocks)32*4882a593Smuzhiyun void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct super_block *sb = ip->i_sb;
35*4882a593Smuzhiyun int r = 0;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
38*4882a593Smuzhiyun if (unlikely(r != 0)) {
39*4882a593Smuzhiyun jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!",
40*4882a593Smuzhiyun sb, (unsigned long long)blkno,
41*4882a593Smuzhiyun (unsigned long long)nblocks, r);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d",
45*4882a593Smuzhiyun sb, (unsigned long long)blkno,
46*4882a593Smuzhiyun (unsigned long long)nblocks, r);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun /*
52*4882a593Smuzhiyun * NAME: jfs_ioc_trim()
53*4882a593Smuzhiyun *
54*4882a593Smuzhiyun * FUNCTION: attempt to discard (TRIM) all free blocks from the
55*4882a593Smuzhiyun * filesystem.
56*4882a593Smuzhiyun *
57*4882a593Smuzhiyun * PARAMETERS:
58*4882a593Smuzhiyun * ip - pointer to in-core inode;
59*4882a593Smuzhiyun * range - the range, given by user space
60*4882a593Smuzhiyun *
61*4882a593Smuzhiyun * RETURN VALUES:
62*4882a593Smuzhiyun * 0 - success
63*4882a593Smuzhiyun * -EIO - i/o error
64*4882a593Smuzhiyun */
jfs_ioc_trim(struct inode * ip,struct fstrim_range * range)65*4882a593Smuzhiyun int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
68*4882a593Smuzhiyun struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
69*4882a593Smuzhiyun struct super_block *sb = ipbmap->i_sb;
70*4882a593Smuzhiyun int agno, agno_end;
71*4882a593Smuzhiyun u64 start, end, minlen;
72*4882a593Smuzhiyun u64 trimmed = 0;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun /**
75*4882a593Smuzhiyun * convert byte values to block size of filesystem:
76*4882a593Smuzhiyun * start: First Byte to trim
77*4882a593Smuzhiyun * len: number of Bytes to trim from start
78*4882a593Smuzhiyun * minlen: minimum extent length in Bytes
79*4882a593Smuzhiyun */
80*4882a593Smuzhiyun start = range->start >> sb->s_blocksize_bits;
81*4882a593Smuzhiyun end = start + (range->len >> sb->s_blocksize_bits) - 1;
82*4882a593Smuzhiyun minlen = range->minlen >> sb->s_blocksize_bits;
83*4882a593Smuzhiyun if (minlen == 0)
84*4882a593Smuzhiyun minlen = 1;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun if (minlen > bmp->db_agsize ||
87*4882a593Smuzhiyun start >= bmp->db_mapsize ||
88*4882a593Smuzhiyun range->len < sb->s_blocksize)
89*4882a593Smuzhiyun return -EINVAL;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun if (end >= bmp->db_mapsize)
92*4882a593Smuzhiyun end = bmp->db_mapsize - 1;
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun /**
95*4882a593Smuzhiyun * we trim all ag's within the range
96*4882a593Smuzhiyun */
97*4882a593Smuzhiyun agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
98*4882a593Smuzhiyun agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
99*4882a593Smuzhiyun while (agno <= agno_end) {
100*4882a593Smuzhiyun trimmed += dbDiscardAG(ip, agno, minlen);
101*4882a593Smuzhiyun agno++;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun range->len = trimmed << sb->s_blocksize_bits;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun return 0;
106*4882a593Smuzhiyun }
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