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a46db608 CH |
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" | |
6ca1c906 | 19 | #include "xfs_format.h" |
a46db608 | 20 | #include "xfs_sb.h" |
a46db608 CH |
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" | |
efc27b52 | 33 | #include "xfs_extent_busy.h" |
a46db608 CH |
34 | #include "xfs_discard.h" |
35 | #include "xfs_trace.h" | |
36 | ||
37 | STATIC int | |
38 | xfs_trim_extents( | |
39 | struct xfs_mount *mp, | |
40 | xfs_agnumber_t agno, | |
a66d6363 DC |
41 | xfs_daddr_t start, |
42 | xfs_daddr_t end, | |
43 | xfs_daddr_t minlen, | |
a46db608 CH |
44 | __uint64_t *blocks_trimmed) |
45 | { | |
46 | struct block_device *bdev = mp->m_ddev_targp->bt_bdev; | |
47 | struct xfs_btree_cur *cur; | |
48 | struct xfs_buf *agbp; | |
49 | struct xfs_perag *pag; | |
50 | int error; | |
51 | int i; | |
52 | ||
53 | pag = xfs_perag_get(mp, agno); | |
54 | ||
55 | error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); | |
56 | if (error || !agbp) | |
57 | goto out_put_perag; | |
58 | ||
59 | cur = xfs_allocbt_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_CNT); | |
60 | ||
61 | /* | |
62 | * Force out the log. This means any transactions that might have freed | |
63 | * space before we took the AGF buffer lock are now on disk, and the | |
64 | * volatile disk cache is flushed. | |
65 | */ | |
66 | xfs_log_force(mp, XFS_LOG_SYNC); | |
67 | ||
68 | /* | |
69 | * Look up the longest btree in the AGF and start with it. | |
70 | */ | |
a66d6363 | 71 | error = xfs_alloc_lookup_ge(cur, 0, |
b1c770c2 | 72 | be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i); |
a46db608 CH |
73 | if (error) |
74 | goto out_del_cursor; | |
75 | ||
76 | /* | |
77 | * Loop until we are done with all extents that are large | |
78 | * enough to be worth discarding. | |
79 | */ | |
80 | while (i) { | |
a66d6363 DC |
81 | xfs_agblock_t fbno; |
82 | xfs_extlen_t flen; | |
83 | xfs_daddr_t dbno; | |
84 | xfs_extlen_t dlen; | |
a46db608 CH |
85 | |
86 | error = xfs_alloc_get_rec(cur, &fbno, &flen, &i); | |
87 | if (error) | |
88 | goto out_del_cursor; | |
89 | XFS_WANT_CORRUPTED_GOTO(i == 1, out_del_cursor); | |
b1c770c2 | 90 | ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest)); |
a46db608 | 91 | |
a66d6363 DC |
92 | /* |
93 | * use daddr format for all range/len calculations as that is | |
94 | * the format the range/len variables are supplied in by | |
95 | * userspace. | |
96 | */ | |
97 | dbno = XFS_AGB_TO_DADDR(mp, agno, fbno); | |
98 | dlen = XFS_FSB_TO_BB(mp, flen); | |
99 | ||
a46db608 CH |
100 | /* |
101 | * Too small? Give up. | |
102 | */ | |
a66d6363 | 103 | if (dlen < minlen) { |
a46db608 CH |
104 | trace_xfs_discard_toosmall(mp, agno, fbno, flen); |
105 | goto out_del_cursor; | |
106 | } | |
107 | ||
108 | /* | |
109 | * If the extent is entirely outside of the range we are | |
110 | * supposed to discard skip it. Do not bother to trim | |
111 | * down partially overlapping ranges for now. | |
112 | */ | |
a66d6363 | 113 | if (dbno + dlen < start || dbno > end) { |
a46db608 CH |
114 | trace_xfs_discard_exclude(mp, agno, fbno, flen); |
115 | goto next_extent; | |
116 | } | |
117 | ||
118 | /* | |
119 | * If any blocks in the range are still busy, skip the | |
120 | * discard and try again the next time. | |
121 | */ | |
4ecbfe63 | 122 | if (xfs_extent_busy_search(mp, agno, fbno, flen)) { |
a46db608 CH |
123 | trace_xfs_discard_busy(mp, agno, fbno, flen); |
124 | goto next_extent; | |
125 | } | |
126 | ||
127 | trace_xfs_discard_extent(mp, agno, fbno, flen); | |
a66d6363 | 128 | error = -blkdev_issue_discard(bdev, dbno, dlen, GFP_NOFS, 0); |
a46db608 CH |
129 | if (error) |
130 | goto out_del_cursor; | |
131 | *blocks_trimmed += flen; | |
132 | ||
133 | next_extent: | |
134 | error = xfs_btree_decrement(cur, 0, &i); | |
135 | if (error) | |
136 | goto out_del_cursor; | |
137 | } | |
138 | ||
139 | out_del_cursor: | |
140 | xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); | |
141 | xfs_buf_relse(agbp); | |
142 | out_put_perag: | |
143 | xfs_perag_put(pag); | |
144 | return error; | |
145 | } | |
146 | ||
a66d6363 DC |
147 | /* |
148 | * trim a range of the filesystem. | |
149 | * | |
150 | * Note: the parameters passed from userspace are byte ranges into the | |
151 | * filesystem which does not match to the format we use for filesystem block | |
152 | * addressing. FSB addressing is sparse (AGNO|AGBNO), while the incoming format | |
153 | * is a linear address range. Hence we need to use DADDR based conversions and | |
154 | * comparisons for determining the correct offset and regions to trim. | |
155 | */ | |
a46db608 CH |
156 | int |
157 | xfs_ioc_trim( | |
158 | struct xfs_mount *mp, | |
159 | struct fstrim_range __user *urange) | |
160 | { | |
161 | struct request_queue *q = mp->m_ddev_targp->bt_bdev->bd_disk->queue; | |
162 | unsigned int granularity = q->limits.discard_granularity; | |
163 | struct fstrim_range range; | |
a66d6363 | 164 | xfs_daddr_t start, end, minlen; |
a46db608 CH |
165 | xfs_agnumber_t start_agno, end_agno, agno; |
166 | __uint64_t blocks_trimmed = 0; | |
167 | int error, last_error = 0; | |
168 | ||
169 | if (!capable(CAP_SYS_ADMIN)) | |
170 | return -XFS_ERROR(EPERM); | |
be715140 LC |
171 | if (!blk_queue_discard(q)) |
172 | return -XFS_ERROR(EOPNOTSUPP); | |
a46db608 CH |
173 | if (copy_from_user(&range, urange, sizeof(range))) |
174 | return -XFS_ERROR(EFAULT); | |
175 | ||
176 | /* | |
177 | * Truncating down the len isn't actually quite correct, but using | |
a66d6363 | 178 | * BBTOB would mean we trivially get overflows for values |
a46db608 CH |
179 | * of ULLONG_MAX or slightly lower. And ULLONG_MAX is the default |
180 | * used by the fstrim application. In the end it really doesn't | |
181 | * matter as trimming blocks is an advisory interface. | |
182 | */ | |
a672e1be TR |
183 | if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) || |
184 | range.minlen > XFS_FSB_TO_B(mp, XFS_ALLOC_AG_MAX_USABLE(mp))) | |
185 | return -XFS_ERROR(EINVAL); | |
186 | ||
a66d6363 DC |
187 | start = BTOBB(range.start); |
188 | end = start + BTOBBT(range.len) - 1; | |
189 | minlen = BTOBB(max_t(u64, granularity, range.minlen)); | |
a46db608 | 190 | |
a66d6363 DC |
191 | if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1) |
192 | end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1; | |
a46db608 | 193 | |
a66d6363 DC |
194 | start_agno = xfs_daddr_to_agno(mp, start); |
195 | end_agno = xfs_daddr_to_agno(mp, end); | |
a46db608 CH |
196 | |
197 | for (agno = start_agno; agno <= end_agno; agno++) { | |
c029a50d | 198 | error = -xfs_trim_extents(mp, agno, start, end, minlen, |
a46db608 CH |
199 | &blocks_trimmed); |
200 | if (error) | |
201 | last_error = error; | |
202 | } | |
203 | ||
204 | if (last_error) | |
205 | return last_error; | |
206 | ||
207 | range.len = XFS_FSB_TO_B(mp, blocks_trimmed); | |
208 | if (copy_to_user(urange, &range, sizeof(range))) | |
209 | return -XFS_ERROR(EFAULT); | |
210 | return 0; | |
211 | } | |
e84661aa CH |
212 | |
213 | int | |
214 | xfs_discard_extents( | |
215 | struct xfs_mount *mp, | |
216 | struct list_head *list) | |
217 | { | |
4ecbfe63 | 218 | struct xfs_extent_busy *busyp; |
e84661aa CH |
219 | int error = 0; |
220 | ||
221 | list_for_each_entry(busyp, list, list) { | |
222 | trace_xfs_discard_extent(mp, busyp->agno, busyp->bno, | |
223 | busyp->length); | |
224 | ||
225 | error = -blkdev_issue_discard(mp->m_ddev_targp->bt_bdev, | |
226 | XFS_AGB_TO_DADDR(mp, busyp->agno, busyp->bno), | |
227 | XFS_FSB_TO_BB(mp, busyp->length), | |
228 | GFP_NOFS, 0); | |
229 | if (error && error != EOPNOTSUPP) { | |
230 | xfs_info(mp, | |
231 | "discard failed for extent [0x%llu,%u], error %d", | |
232 | (unsigned long long)busyp->bno, | |
233 | busyp->length, | |
234 | error); | |
235 | return error; | |
236 | } | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } |