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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b40c2e66 TR |
2 | /* |
3 | * Copyright (C) Tino Reichardt, 2012 | |
b40c2e66 TR |
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, blkno, nblocks, GFP_NOFS, 0); | |
38 | if (unlikely(r != 0)) { | |
aa575749 | 39 | jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!", |
b40c2e66 TR |
40 | sb, (unsigned long long)blkno, |
41 | (unsigned long long)nblocks, r); | |
42 | } | |
43 | ||
aa575749 | 44 | jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d", |
b40c2e66 TR |
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(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; | |
4e7a4b01 | 71 | u64 start, end, minlen; |
b40c2e66 TR |
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; | |
b40c2e66 | 81 | end = start + (range->len >> sb->s_blocksize_bits) - 1; |
b40c2e66 | 82 | minlen = range->minlen >> sb->s_blocksize_bits; |
4e7a4b01 | 83 | if (minlen == 0) |
b40c2e66 TR |
84 | minlen = 1; |
85 | ||
4e7a4b01 LC |
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 | ||
b40c2e66 TR |
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 | } |