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b40c2e66 TR |
1 | /* |
2 | * Copyright (C) Tino Reichardt, 2012 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
19 | #include <linux/fs.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/blkdev.h> | |
22 | ||
23 | #include "jfs_incore.h" | |
24 | #include "jfs_superblock.h" | |
25 | #include "jfs_discard.h" | |
26 | #include "jfs_dmap.h" | |
27 | #include "jfs_debug.h" | |
28 | ||
29 | ||
30 | /* | |
31 | * NAME: jfs_issue_discard() | |
32 | * | |
33 | * FUNCTION: TRIM the specified block range on device, if supported | |
34 | * | |
35 | * PARAMETERS: | |
36 | * ip - pointer to in-core inode | |
37 | * blkno - starting block number to be trimmed (0..N) | |
38 | * nblocks - number of blocks to be trimmed | |
39 | * | |
40 | * RETURN VALUES: | |
41 | * none | |
42 | * | |
43 | * serialization: IREAD_LOCK(ipbmap) held on entry/exit; | |
44 | */ | |
45 | void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks) | |
46 | { | |
47 | struct super_block *sb = ip->i_sb; | |
48 | int r = 0; | |
49 | ||
50 | r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0); | |
51 | if (unlikely(r != 0)) { | |
52 | jfs_err("JFS: sb_issue_discard" \ | |
53 | "(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!\n", | |
54 | sb, (unsigned long long)blkno, | |
55 | (unsigned long long)nblocks, r); | |
56 | } | |
57 | ||
58 | jfs_info("JFS: sb_issue_discard" \ | |
59 | "(%p, %llu, %llu, GFP_NOFS, 0) = %d\n", | |
60 | sb, (unsigned long long)blkno, | |
61 | (unsigned long long)nblocks, r); | |
62 | ||
63 | return; | |
64 | } | |
65 | ||
66 | /* | |
67 | * NAME: jfs_ioc_trim() | |
68 | * | |
69 | * FUNCTION: attempt to discard (TRIM) all free blocks from the | |
70 | * filesystem. | |
71 | * | |
72 | * PARAMETERS: | |
73 | * ip - pointer to in-core inode; | |
74 | * range - the range, given by user space | |
75 | * | |
76 | * RETURN VALUES: | |
77 | * 0 - success | |
78 | * -EIO - i/o error | |
79 | */ | |
80 | int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) | |
81 | { | |
82 | struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; | |
83 | struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap; | |
84 | struct super_block *sb = ipbmap->i_sb; | |
85 | int agno, agno_end; | |
4e7a4b01 | 86 | u64 start, end, minlen; |
b40c2e66 TR |
87 | u64 trimmed = 0; |
88 | ||
89 | /** | |
90 | * convert byte values to block size of filesystem: | |
91 | * start: First Byte to trim | |
92 | * len: number of Bytes to trim from start | |
93 | * minlen: minimum extent length in Bytes | |
94 | */ | |
95 | start = range->start >> sb->s_blocksize_bits; | |
b40c2e66 | 96 | end = start + (range->len >> sb->s_blocksize_bits) - 1; |
b40c2e66 | 97 | minlen = range->minlen >> sb->s_blocksize_bits; |
4e7a4b01 | 98 | if (minlen == 0) |
b40c2e66 TR |
99 | minlen = 1; |
100 | ||
4e7a4b01 LC |
101 | if (minlen > bmp->db_agsize || |
102 | start >= bmp->db_mapsize || | |
103 | range->len < sb->s_blocksize) | |
104 | return -EINVAL; | |
105 | ||
106 | if (end >= bmp->db_mapsize) | |
107 | end = bmp->db_mapsize - 1; | |
108 | ||
b40c2e66 TR |
109 | /** |
110 | * we trim all ag's within the range | |
111 | */ | |
112 | agno = BLKTOAG(start, JFS_SBI(ip->i_sb)); | |
113 | agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb)); | |
114 | while (agno <= agno_end) { | |
115 | trimmed += dbDiscardAG(ip, agno, minlen); | |
116 | agno++; | |
117 | } | |
118 | range->len = trimmed << sb->s_blocksize_bits; | |
119 | ||
120 | return 0; | |
121 | } |