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 | */ |
32 | void 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, block: blkno, nr_blocks: nblocks, GFP_NOFS, flags: 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 | */ |
65 | int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) |
66 | { |
67 | struct inode *ipbmap = JFS_SBI(sb: ip->i_sb)->ipbmap; |
68 | struct bmap *bmp = JFS_SBI(sb: 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 | |