blob: 244e797dae327a7da95992e23697489397c4bbc1 [file] [log] [blame]
Christoph Hellwiga46db602011-01-07 13:02:04 +00001/*
2 * Copyright (C) 2010 Red Hat, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * 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 the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_sb.h"
20#include "xfs_inum.h"
21#include "xfs_log.h"
22#include "xfs_ag.h"
23#include "xfs_mount.h"
24#include "xfs_quota.h"
25#include "xfs_trans.h"
26#include "xfs_alloc_btree.h"
27#include "xfs_bmap_btree.h"
28#include "xfs_ialloc_btree.h"
29#include "xfs_btree.h"
30#include "xfs_inode.h"
31#include "xfs_alloc.h"
32#include "xfs_error.h"
33#include "xfs_discard.h"
34#include "xfs_trace.h"
35
36STATIC int
37xfs_trim_extents(
38 struct xfs_mount *mp,
39 xfs_agnumber_t agno,
40 xfs_fsblock_t start,
41 xfs_fsblock_t len,
42 xfs_fsblock_t minlen,
43 __uint64_t *blocks_trimmed)
44{
45 struct block_device *bdev = mp->m_ddev_targp->bt_bdev;
46 struct xfs_btree_cur *cur;
47 struct xfs_buf *agbp;
48 struct xfs_perag *pag;
49 int error;
50 int i;
51
52 pag = xfs_perag_get(mp, agno);
53
54 error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
55 if (error || !agbp)
56 goto out_put_perag;
57
58 cur = xfs_allocbt_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_CNT);
59
60 /*
61 * Force out the log. This means any transactions that might have freed
62 * space before we took the AGF buffer lock are now on disk, and the
63 * volatile disk cache is flushed.
64 */
65 xfs_log_force(mp, XFS_LOG_SYNC);
66
67 /*
68 * Look up the longest btree in the AGF and start with it.
69 */
70 error = xfs_alloc_lookup_le(cur, 0,
71 XFS_BUF_TO_AGF(agbp)->agf_longest, &i);
72 if (error)
73 goto out_del_cursor;
74
75 /*
76 * Loop until we are done with all extents that are large
77 * enough to be worth discarding.
78 */
79 while (i) {
80 xfs_agblock_t fbno;
81 xfs_extlen_t flen;
82
83 error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
84 if (error)
85 goto out_del_cursor;
86 XFS_WANT_CORRUPTED_GOTO(i == 1, out_del_cursor);
87 ASSERT(flen <= XFS_BUF_TO_AGF(agbp)->agf_longest);
88
89 /*
90 * Too small? Give up.
91 */
92 if (flen < minlen) {
93 trace_xfs_discard_toosmall(mp, agno, fbno, flen);
94 goto out_del_cursor;
95 }
96
97 /*
98 * If the extent is entirely outside of the range we are
99 * supposed to discard skip it. Do not bother to trim
100 * down partially overlapping ranges for now.
101 */
102 if (XFS_AGB_TO_FSB(mp, agno, fbno) + flen < start ||
103 XFS_AGB_TO_FSB(mp, agno, fbno) >= start + len) {
104 trace_xfs_discard_exclude(mp, agno, fbno, flen);
105 goto next_extent;
106 }
107
108 /*
109 * If any blocks in the range are still busy, skip the
110 * discard and try again the next time.
111 */
112 if (xfs_alloc_busy_search(mp, agno, fbno, flen)) {
113 trace_xfs_discard_busy(mp, agno, fbno, flen);
114 goto next_extent;
115 }
116
117 trace_xfs_discard_extent(mp, agno, fbno, flen);
118 error = -blkdev_issue_discard(bdev,
119 XFS_AGB_TO_DADDR(mp, agno, fbno),
120 XFS_FSB_TO_BB(mp, flen),
121 GFP_NOFS, 0);
122 if (error)
123 goto out_del_cursor;
124 *blocks_trimmed += flen;
125
126next_extent:
127 error = xfs_btree_decrement(cur, 0, &i);
128 if (error)
129 goto out_del_cursor;
130 }
131
132out_del_cursor:
133 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
134 xfs_buf_relse(agbp);
135out_put_perag:
136 xfs_perag_put(pag);
137 return error;
138}
139
140int
141xfs_ioc_trim(
142 struct xfs_mount *mp,
143 struct fstrim_range __user *urange)
144{
145 struct request_queue *q = mp->m_ddev_targp->bt_bdev->bd_disk->queue;
146 unsigned int granularity = q->limits.discard_granularity;
147 struct fstrim_range range;
148 xfs_fsblock_t start, len, minlen;
149 xfs_agnumber_t start_agno, end_agno, agno;
150 __uint64_t blocks_trimmed = 0;
151 int error, last_error = 0;
152
153 if (!capable(CAP_SYS_ADMIN))
154 return -XFS_ERROR(EPERM);
Lukas Czernerbe715142011-02-15 17:07:36 +0000155 if (!blk_queue_discard(q))
156 return -XFS_ERROR(EOPNOTSUPP);
Christoph Hellwiga46db602011-01-07 13:02:04 +0000157 if (copy_from_user(&range, urange, sizeof(range)))
158 return -XFS_ERROR(EFAULT);
159
160 /*
161 * Truncating down the len isn't actually quite correct, but using
162 * XFS_B_TO_FSB would mean we trivially get overflows for values
163 * of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default
164 * used by the fstrim application. In the end it really doesn't
165 * matter as trimming blocks is an advisory interface.
166 */
167 start = XFS_B_TO_FSBT(mp, range.start);
168 len = XFS_B_TO_FSBT(mp, range.len);
169 minlen = XFS_B_TO_FSB(mp, max_t(u64, granularity, range.minlen));
170
171 start_agno = XFS_FSB_TO_AGNO(mp, start);
172 if (start_agno >= mp->m_sb.sb_agcount)
173 return -XFS_ERROR(EINVAL);
174
175 end_agno = XFS_FSB_TO_AGNO(mp, start + len);
176 if (end_agno >= mp->m_sb.sb_agcount)
177 end_agno = mp->m_sb.sb_agcount - 1;
178
179 for (agno = start_agno; agno <= end_agno; agno++) {
180 error = -xfs_trim_extents(mp, agno, start, len, minlen,
181 &blocks_trimmed);
182 if (error)
183 last_error = error;
184 }
185
186 if (last_error)
187 return last_error;
188
189 range.len = XFS_FSB_TO_B(mp, blocks_trimmed);
190 if (copy_to_user(urange, &range, sizeof(range)))
191 return -XFS_ERROR(EFAULT);
192 return 0;
193}
Christoph Hellwige84661a2011-05-20 13:45:32 +0000194
195int
196xfs_discard_extents(
197 struct xfs_mount *mp,
198 struct list_head *list)
199{
200 struct xfs_busy_extent *busyp;
201 int error = 0;
202
203 list_for_each_entry(busyp, list, list) {
204 trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
205 busyp->length);
206
207 error = -blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
208 XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
209 XFS_FSB_TO_BB(mp, busyp->length),
210 GFP_NOFS, 0);
211 if (error && error != EOPNOTSUPP) {
212 xfs_info(mp,
213 "discard failed for extent [0x%llu,%u], error %d",
214 (unsigned long long)busyp->bno,
215 busyp->length,
216 error);
217 return error;
218 }
219 }
220
221 return 0;
222}