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1/*
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);
155 if (!blk_queue_discard(q))
156 return -XFS_ERROR(EOPNOTSUPP);
157 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}
194
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}
1/*
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_format.h"
20#include "xfs_log_format.h"
21#include "xfs_trans_resv.h"
22#include "xfs_sb.h"
23#include "xfs_mount.h"
24#include "xfs_quota.h"
25#include "xfs_inode.h"
26#include "xfs_btree.h"
27#include "xfs_alloc_btree.h"
28#include "xfs_alloc.h"
29#include "xfs_error.h"
30#include "xfs_extent_busy.h"
31#include "xfs_discard.h"
32#include "xfs_trace.h"
33#include "xfs_log.h"
34
35STATIC int
36xfs_trim_extents(
37 struct xfs_mount *mp,
38 xfs_agnumber_t agno,
39 xfs_daddr_t start,
40 xfs_daddr_t end,
41 xfs_daddr_t minlen,
42 __uint64_t *blocks_trimmed)
43{
44 struct block_device *bdev = mp->m_ddev_targp->bt_bdev;
45 struct xfs_btree_cur *cur;
46 struct xfs_buf *agbp;
47 struct xfs_perag *pag;
48 int error;
49 int i;
50
51 pag = xfs_perag_get(mp, agno);
52
53 error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
54 if (error || !agbp)
55 goto out_put_perag;
56
57 cur = xfs_allocbt_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_CNT);
58
59 /*
60 * Force out the log. This means any transactions that might have freed
61 * space before we took the AGF buffer lock are now on disk, and the
62 * volatile disk cache is flushed.
63 */
64 xfs_log_force(mp, XFS_LOG_SYNC);
65
66 /*
67 * Look up the longest btree in the AGF and start with it.
68 */
69 error = xfs_alloc_lookup_ge(cur, 0,
70 be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i);
71 if (error)
72 goto out_del_cursor;
73
74 /*
75 * Loop until we are done with all extents that are large
76 * enough to be worth discarding.
77 */
78 while (i) {
79 xfs_agblock_t fbno;
80 xfs_extlen_t flen;
81 xfs_daddr_t dbno;
82 xfs_extlen_t dlen;
83
84 error = xfs_alloc_get_rec(cur, &fbno, &flen, &i);
85 if (error)
86 goto out_del_cursor;
87 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_del_cursor);
88 ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest));
89
90 /*
91 * use daddr format for all range/len calculations as that is
92 * the format the range/len variables are supplied in by
93 * userspace.
94 */
95 dbno = XFS_AGB_TO_DADDR(mp, agno, fbno);
96 dlen = XFS_FSB_TO_BB(mp, flen);
97
98 /*
99 * Too small? Give up.
100 */
101 if (dlen < minlen) {
102 trace_xfs_discard_toosmall(mp, agno, fbno, flen);
103 goto out_del_cursor;
104 }
105
106 /*
107 * If the extent is entirely outside of the range we are
108 * supposed to discard skip it. Do not bother to trim
109 * down partially overlapping ranges for now.
110 */
111 if (dbno + dlen < start || dbno > end) {
112 trace_xfs_discard_exclude(mp, agno, fbno, flen);
113 goto next_extent;
114 }
115
116 /*
117 * If any blocks in the range are still busy, skip the
118 * discard and try again the next time.
119 */
120 if (xfs_extent_busy_search(mp, agno, fbno, flen)) {
121 trace_xfs_discard_busy(mp, agno, fbno, flen);
122 goto next_extent;
123 }
124
125 trace_xfs_discard_extent(mp, agno, fbno, flen);
126 error = blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS, 0);
127 if (error)
128 goto out_del_cursor;
129 *blocks_trimmed += flen;
130
131next_extent:
132 error = xfs_btree_decrement(cur, 0, &i);
133 if (error)
134 goto out_del_cursor;
135 }
136
137out_del_cursor:
138 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
139 xfs_buf_relse(agbp);
140out_put_perag:
141 xfs_perag_put(pag);
142 return error;
143}
144
145/*
146 * trim a range of the filesystem.
147 *
148 * Note: the parameters passed from userspace are byte ranges into the
149 * filesystem which does not match to the format we use for filesystem block
150 * addressing. FSB addressing is sparse (AGNO|AGBNO), while the incoming format
151 * is a linear address range. Hence we need to use DADDR based conversions and
152 * comparisons for determining the correct offset and regions to trim.
153 */
154int
155xfs_ioc_trim(
156 struct xfs_mount *mp,
157 struct fstrim_range __user *urange)
158{
159 struct request_queue *q = bdev_get_queue(mp->m_ddev_targp->bt_bdev);
160 unsigned int granularity = q->limits.discard_granularity;
161 struct fstrim_range range;
162 xfs_daddr_t start, end, minlen;
163 xfs_agnumber_t start_agno, end_agno, agno;
164 __uint64_t blocks_trimmed = 0;
165 int error, last_error = 0;
166
167 if (!capable(CAP_SYS_ADMIN))
168 return -EPERM;
169 if (!blk_queue_discard(q))
170 return -EOPNOTSUPP;
171 if (copy_from_user(&range, urange, sizeof(range)))
172 return -EFAULT;
173
174 /*
175 * Truncating down the len isn't actually quite correct, but using
176 * BBTOB would mean we trivially get overflows for values
177 * of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default
178 * used by the fstrim application. In the end it really doesn't
179 * matter as trimming blocks is an advisory interface.
180 */
181 if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) ||
182 range.minlen > XFS_FSB_TO_B(mp, mp->m_ag_max_usable) ||
183 range.len < mp->m_sb.sb_blocksize)
184 return -EINVAL;
185
186 start = BTOBB(range.start);
187 end = start + BTOBBT(range.len) - 1;
188 minlen = BTOBB(max_t(u64, granularity, range.minlen));
189
190 if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
191 end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;
192
193 start_agno = xfs_daddr_to_agno(mp, start);
194 end_agno = xfs_daddr_to_agno(mp, end);
195
196 for (agno = start_agno; agno <= end_agno; agno++) {
197 error = xfs_trim_extents(mp, agno, start, end, minlen,
198 &blocks_trimmed);
199 if (error)
200 last_error = error;
201 }
202
203 if (last_error)
204 return last_error;
205
206 range.len = XFS_FSB_TO_B(mp, blocks_trimmed);
207 if (copy_to_user(urange, &range, sizeof(range)))
208 return -EFAULT;
209 return 0;
210}
211
212int
213xfs_discard_extents(
214 struct xfs_mount *mp,
215 struct list_head *list)
216{
217 struct xfs_extent_busy *busyp;
218 int error = 0;
219
220 list_for_each_entry(busyp, list, list) {
221 trace_xfs_discard_extent(mp, busyp->agno, busyp->bno,
222 busyp->length);
223
224 error = blkdev_issue_discard(mp->m_ddev_targp->bt_bdev,
225 XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno),
226 XFS_FSB_TO_BB(mp, busyp->length),
227 GFP_NOFS, 0);
228 if (error && error != -EOPNOTSUPP) {
229 xfs_info(mp,
230 "discard failed for extent [0x%llx,%u], error %d",
231 (unsigned long long)busyp->bno,
232 busyp->length,
233 error);
234 return error;
235 }
236 }
237
238 return 0;
239}