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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"
Christoph Hellwiga46db602011-01-07 13:02:04 +000020#include "xfs_log.h"
21#include "xfs_ag.h"
22#include "xfs_mount.h"
23#include "xfs_quota.h"
24#include "xfs_trans.h"
25#include "xfs_alloc_btree.h"
26#include "xfs_bmap_btree.h"
27#include "xfs_ialloc_btree.h"
28#include "xfs_btree.h"
29#include "xfs_inode.h"
30#include "xfs_alloc.h"
31#include "xfs_error.h"
Dave Chinnerefc27b52012-04-29 10:39:43 +000032#include "xfs_extent_busy.h"
Christoph Hellwiga46db602011-01-07 13:02:04 +000033#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,
Dave Chinnera66d6362012-03-22 05:15:12 +000040 xfs_daddr_t start,
41 xfs_daddr_t end,
42 xfs_daddr_t minlen,
Christoph Hellwiga46db602011-01-07 13:02:04 +000043 __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 */
Dave Chinnera66d6362012-03-22 05:15:12 +000070 error = xfs_alloc_lookup_ge(cur, 0,
Dave Chinnerb1c770c2011-12-21 00:07:42 +000071 be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i);
Christoph Hellwiga46db602011-01-07 13:02:04 +000072 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) {
Dave Chinnera66d6362012-03-22 05:15:12 +000080 xfs_agblock_t fbno;
81 xfs_extlen_t flen;
82 xfs_daddr_t dbno;
83 xfs_extlen_t dlen;
Christoph Hellwiga46db602011-01-07 13:02:04 +000084
85 error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
86 if (error)
87 goto out_del_cursor;
88 XFS_WANT_CORRUPTED_GOTO(i == 1, out_del_cursor);
Dave Chinnerb1c770c2011-12-21 00:07:42 +000089 ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest));
Christoph Hellwiga46db602011-01-07 13:02:04 +000090
91 /*
Dave Chinnera66d6362012-03-22 05:15:12 +000092 * use daddr format for all range/len calculations as that is
93 * the format the range/len variables are supplied in by
94 * userspace.
95 */
96 dbno = XFS_AGB_TO_DADDR(mp, agno, fbno);
97 dlen = XFS_FSB_TO_BB(mp, flen);
98
99 /*
Christoph Hellwiga46db602011-01-07 13:02:04 +0000100 * Too small? Give up.
101 */
Dave Chinnera66d6362012-03-22 05:15:12 +0000102 if (dlen < minlen) {
Christoph Hellwiga46db602011-01-07 13:02:04 +0000103 trace_xfs_discard_toosmall(mp, agno, fbno, flen);
104 goto out_del_cursor;
105 }
106
107 /*
108 * If the extent is entirely outside of the range we are
109 * supposed to discard skip it. Do not bother to trim
110 * down partially overlapping ranges for now.
111 */
Dave Chinnera66d6362012-03-22 05:15:12 +0000112 if (dbno + dlen < start || dbno > end) {
Christoph Hellwiga46db602011-01-07 13:02:04 +0000113 trace_xfs_discard_exclude(mp, agno, fbno, flen);
114 goto next_extent;
115 }
116
117 /*
118 * If any blocks in the range are still busy, skip the
119 * discard and try again the next time.
120 */
Dave Chinner4ecbfe62012-04-29 10:41:10 +0000121 if (xfs_extent_busy_search(mp, agno, fbno, flen)) {
Christoph Hellwiga46db602011-01-07 13:02:04 +0000122 trace_xfs_discard_busy(mp, agno, fbno, flen);
123 goto next_extent;
124 }
125
126 trace_xfs_discard_extent(mp, agno, fbno, flen);
Dave Chinnera66d6362012-03-22 05:15:12 +0000127 error = -blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS, 0);
Christoph Hellwiga46db602011-01-07 13:02:04 +0000128 if (error)
129 goto out_del_cursor;
130 *blocks_trimmed += flen;
131
132next_extent:
133 error = xfs_btree_decrement(cur, 0, &i);
134 if (error)
135 goto out_del_cursor;
136 }
137
138out_del_cursor:
139 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
140 xfs_buf_relse(agbp);
141out_put_perag:
142 xfs_perag_put(pag);
143 return error;
144}
145
Dave Chinnera66d6362012-03-22 05:15:12 +0000146/*
147 * trim a range of the filesystem.
148 *
149 * Note: the parameters passed from userspace are byte ranges into the
150 * filesystem which does not match to the format we use for filesystem block
151 * addressing. FSB addressing is sparse (AGNO|AGBNO), while the incoming format
152 * is a linear address range. Hence we need to use DADDR based conversions and
153 * comparisons for determining the correct offset and regions to trim.
154 */
Christoph Hellwiga46db602011-01-07 13:02:04 +0000155int
156xfs_ioc_trim(
157 struct xfs_mount *mp,
158 struct fstrim_range __user *urange)
159{
160 struct request_queue *q = mp->m_ddev_targp->bt_bdev->bd_disk->queue;
161 unsigned int granularity = q->limits.discard_granularity;
162 struct fstrim_range range;
Dave Chinnera66d6362012-03-22 05:15:12 +0000163 xfs_daddr_t start, end, minlen;
Christoph Hellwiga46db602011-01-07 13:02:04 +0000164 xfs_agnumber_t start_agno, end_agno, agno;
165 __uint64_t blocks_trimmed = 0;
166 int error, last_error = 0;
167
168 if (!capable(CAP_SYS_ADMIN))
169 return -XFS_ERROR(EPERM);
Lukas Czernerbe715142011-02-15 17:07:36 +0000170 if (!blk_queue_discard(q))
171 return -XFS_ERROR(EOPNOTSUPP);
Christoph Hellwiga46db602011-01-07 13:02:04 +0000172 if (copy_from_user(&range, urange, sizeof(range)))
173 return -XFS_ERROR(EFAULT);
174
175 /*
176 * Truncating down the len isn't actually quite correct, but using
Dave Chinnera66d6362012-03-22 05:15:12 +0000177 * BBTOB would mean we trivially get overflows for values
Christoph Hellwiga46db602011-01-07 13:02:04 +0000178 * of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default
179 * used by the fstrim application. In the end it really doesn't
180 * matter as trimming blocks is an advisory interface.
181 */
Dave Chinnera66d6362012-03-22 05:15:12 +0000182 start = BTOBB(range.start);
183 end = start + BTOBBT(range.len) - 1;
184 minlen = BTOBB(max_t(u64, granularity, range.minlen));
Christoph Hellwiga46db602011-01-07 13:02:04 +0000185
Dave Chinnera66d6362012-03-22 05:15:12 +0000186 if (XFS_BB_TO_FSB(mp, start) >= mp->m_sb.sb_dblocks)
Christoph Hellwiga46db602011-01-07 13:02:04 +0000187 return -XFS_ERROR(EINVAL);
Dave Chinnera66d6362012-03-22 05:15:12 +0000188 if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
189 end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;
Christoph Hellwiga46db602011-01-07 13:02:04 +0000190
Dave Chinnera66d6362012-03-22 05:15:12 +0000191 start_agno = xfs_daddr_to_agno(mp, start);
192 end_agno = xfs_daddr_to_agno(mp, end);
Christoph Hellwiga46db602011-01-07 13:02:04 +0000193
194 for (agno = start_agno; agno <= end_agno; agno++) {
Lukas Czernerc029a502011-09-21 09:42:30 +0000195 error = -xfs_trim_extents(mp, agno, start, end, minlen,
Christoph Hellwiga46db602011-01-07 13:02:04 +0000196 &blocks_trimmed);
197 if (error)
198 last_error = error;
199 }
200
201 if (last_error)
202 return last_error;
203
204 range.len = XFS_FSB_TO_B(mp, blocks_trimmed);
205 if (copy_to_user(urange, &range, sizeof(range)))
206 return -XFS_ERROR(EFAULT);
207 return 0;
208}
Christoph Hellwige84661a2011-05-20 13:45:32 +0000209
210int
211xfs_discard_extents(
212 struct xfs_mount *mp,
213 struct list_head *list)
214{
Dave Chinner4ecbfe62012-04-29 10:41:10 +0000215 struct xfs_extent_busy *busyp;
Christoph Hellwige84661a2011-05-20 13:45:32 +0000216 int error = 0;
217
218 list_for_each_entry(busyp, list, list) {
219 trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
220 busyp->length);
221
222 error = -blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
223 XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
224 XFS_FSB_TO_BB(mp, busyp->length),
225 GFP_NOFS, 0);
226 if (error && error != EOPNOTSUPP) {
227 xfs_info(mp,
228 "discard failed for extent [0x%llu,%u], error %d",
229 (unsigned long long)busyp->bno,
230 busyp->length,
231 error);
232 return error;
233 }
234 }
235
236 return 0;
237}