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959ef981 | 1 | // SPDX-License-Identifier: GPL-2.0 |
82c3a179 BD |
2 | /* |
3 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. | |
4 | * All Rights Reserved. | |
82c3a179 BD |
5 | */ |
6 | ||
7 | #include "libxfs.h" | |
8 | #include "libxcmd.h" | |
9 | #ifdef ENABLE_BLKID | |
10 | # include <blkid/blkid.h> | |
11 | #endif /* ENABLE_BLKID */ | |
12 | #include "xfs_multidisk.h" | |
7478c2e3 | 13 | #include "topology.h" |
b658de93 | 14 | #include "platform.h" |
82c3a179 | 15 | |
14f8b681 DW |
16 | #define TERABYTES(count, blog) ((uint64_t)(count) << (40 - (blog))) |
17 | #define GIGABYTES(count, blog) ((uint64_t)(count) << (30 - (blog))) | |
18 | #define MEGABYTES(count, blog) ((uint64_t)(count) << (20 - (blog))) | |
82c3a179 BD |
19 | |
20 | void | |
21 | calc_default_ag_geometry( | |
22 | int blocklog, | |
14f8b681 | 23 | uint64_t dblocks, |
82c3a179 | 24 | int multidisk, |
14f8b681 DW |
25 | uint64_t *agsize, |
26 | uint64_t *agcount) | |
82c3a179 | 27 | { |
14f8b681 | 28 | uint64_t blocks = 0; |
82c3a179 BD |
29 | int shift = 0; |
30 | ||
31 | /* | |
32 | * First handle the high extreme - the point at which we will | |
33 | * always use the maximum AG size. | |
34 | * | |
35 | * This applies regardless of storage configuration. | |
36 | */ | |
37 | if (dblocks >= TERABYTES(32, blocklog)) { | |
38 | blocks = XFS_AG_MAX_BLOCKS(blocklog); | |
39 | goto done; | |
40 | } | |
41 | ||
42 | /* | |
43 | * For a single underlying storage device over 4TB in size | |
44 | * use the maximum AG size. Between 128MB and 4TB, just use | |
45 | * 4 AGs and scale up smoothly between min/max AG sizes. | |
46 | */ | |
47 | if (!multidisk) { | |
48 | if (dblocks >= TERABYTES(4, blocklog)) { | |
49 | blocks = XFS_AG_MAX_BLOCKS(blocklog); | |
50 | goto done; | |
51 | } else if (dblocks >= MEGABYTES(128, blocklog)) { | |
52 | shift = XFS_NOMULTIDISK_AGLOG; | |
53 | goto calc_blocks; | |
54 | } | |
55 | } | |
56 | ||
57 | /* | |
58 | * For the multidisk configs we choose an AG count based on the number | |
59 | * of data blocks available, trying to keep the number of AGs higher | |
60 | * than the single disk configurations. This makes the assumption that | |
61 | * larger filesystems have more parallelism available to them. | |
62 | */ | |
63 | shift = XFS_MULTIDISK_AGLOG; | |
64 | if (dblocks <= GIGABYTES(512, blocklog)) | |
65 | shift--; | |
66 | if (dblocks <= GIGABYTES(8, blocklog)) | |
67 | shift--; | |
68 | if (dblocks < MEGABYTES(128, blocklog)) | |
69 | shift--; | |
70 | if (dblocks < MEGABYTES(64, blocklog)) | |
71 | shift--; | |
72 | if (dblocks < MEGABYTES(32, blocklog)) | |
73 | shift--; | |
74 | ||
75 | /* | |
76 | * If dblocks is not evenly divisible by the number of | |
77 | * desired AGs, round "blocks" up so we don't lose the | |
78 | * last bit of the filesystem. The same principle applies | |
79 | * to the AG count, so we don't lose the last AG! | |
80 | */ | |
81 | calc_blocks: | |
82 | ASSERT(shift >= 0 && shift <= XFS_MULTIDISK_AGLOG); | |
83 | blocks = dblocks >> shift; | |
84 | if (dblocks & xfs_mask32lo(shift)) { | |
85 | if (blocks < XFS_AG_MAX_BLOCKS(blocklog)) | |
86 | blocks++; | |
87 | } | |
88 | done: | |
89 | *agsize = blocks; | |
90 | *agcount = dblocks / blocks + (dblocks % blocks != 0); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Check for existing filesystem or partition table on device. | |
95 | * Returns: | |
96 | * 1 for existing fs or partition | |
97 | * 0 for nothing found | |
98 | * -1 for internal error | |
99 | */ | |
100 | #ifdef ENABLE_BLKID | |
101 | int | |
102 | check_overwrite( | |
103 | const char *device) | |
104 | { | |
105 | const char *type; | |
106 | blkid_probe pr = NULL; | |
107 | int ret; | |
108 | int fd; | |
109 | long long size; | |
110 | int bsz; | |
111 | ||
112 | if (!device || !*device) | |
113 | return 0; | |
114 | ||
115 | ret = -1; /* will reset on success of all setup calls */ | |
116 | ||
117 | fd = open(device, O_RDONLY); | |
118 | if (fd < 0) | |
119 | goto out; | |
120 | platform_findsizes((char *)device, fd, &size, &bsz); | |
121 | close(fd); | |
122 | ||
123 | /* nothing to overwrite on a 0-length device */ | |
124 | if (size == 0) { | |
125 | ret = 0; | |
126 | goto out; | |
127 | } | |
128 | ||
129 | pr = blkid_new_probe_from_filename(device); | |
130 | if (!pr) | |
131 | goto out; | |
132 | ||
133 | ret = blkid_probe_enable_partitions(pr, 1); | |
134 | if (ret < 0) | |
135 | goto out; | |
136 | ||
137 | ret = blkid_do_fullprobe(pr); | |
138 | if (ret < 0) | |
139 | goto out; | |
140 | ||
141 | /* | |
142 | * Blkid returns 1 for nothing found and 0 when it finds a signature, | |
143 | * but we want the exact opposite, so reverse the return value here. | |
144 | * | |
145 | * In addition print some useful diagnostics about what actually is | |
146 | * on the device. | |
147 | */ | |
148 | if (ret) { | |
149 | ret = 0; | |
150 | goto out; | |
151 | } | |
152 | ||
153 | if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) { | |
154 | fprintf(stderr, | |
155 | _("%s: %s appears to contain an existing " | |
156 | "filesystem (%s).\n"), progname, device, type); | |
157 | } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) { | |
158 | fprintf(stderr, | |
159 | _("%s: %s appears to contain a partition " | |
160 | "table (%s).\n"), progname, device, type); | |
161 | } else { | |
162 | fprintf(stderr, | |
163 | _("%s: %s appears to contain something weird " | |
164 | "according to blkid\n"), progname, device); | |
165 | } | |
166 | ret = 1; | |
167 | out: | |
168 | if (pr) | |
169 | blkid_free_probe(pr); | |
170 | if (ret == -1) | |
171 | fprintf(stderr, | |
172 | _("%s: probe of %s failed, cannot detect " | |
173 | "existing filesystem.\n"), progname, device); | |
174 | return ret; | |
175 | } | |
176 | ||
177 | static void blkid_get_topology( | |
178 | const char *device, | |
179 | int *sunit, | |
180 | int *swidth, | |
181 | int *lsectorsize, | |
182 | int *psectorsize, | |
183 | int force_overwrite) | |
184 | { | |
185 | ||
186 | blkid_topology tp; | |
187 | blkid_probe pr; | |
188 | unsigned long val; | |
189 | struct stat statbuf; | |
190 | ||
191 | /* can't get topology info from a file */ | |
192 | if (!stat(device, &statbuf) && S_ISREG(statbuf.st_mode)) { | |
193 | fprintf(stderr, | |
194 | _("%s: Warning: trying to probe topology of a file %s!\n"), | |
195 | progname, device); | |
196 | return; | |
197 | } | |
198 | ||
199 | pr = blkid_new_probe_from_filename(device); | |
200 | if (!pr) | |
201 | return; | |
202 | ||
203 | tp = blkid_probe_get_topology(pr); | |
204 | if (!tp) | |
205 | goto out_free_probe; | |
206 | ||
207 | val = blkid_topology_get_logical_sector_size(tp); | |
208 | *lsectorsize = val; | |
209 | val = blkid_topology_get_physical_sector_size(tp); | |
210 | *psectorsize = val; | |
211 | val = blkid_topology_get_minimum_io_size(tp); | |
212 | *sunit = val; | |
213 | val = blkid_topology_get_optimal_io_size(tp); | |
214 | *swidth = val; | |
215 | ||
216 | /* | |
217 | * If the reported values are the same as the physical sector size | |
218 | * do not bother to report anything. It will only cause warnings | |
219 | * if people specify larger stripe units or widths manually. | |
220 | */ | |
221 | if (*sunit == *psectorsize || *swidth == *psectorsize) { | |
222 | *sunit = 0; | |
223 | *swidth = 0; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Blkid reports the information in terms of bytes, but we want it in | |
228 | * terms of 512 bytes blocks (only to convert it to bytes later..) | |
229 | */ | |
230 | *sunit = *sunit >> 9; | |
231 | *swidth = *swidth >> 9; | |
232 | ||
233 | if (blkid_topology_get_alignment_offset(tp) != 0) { | |
234 | fprintf(stderr, | |
235 | _("warning: device is not properly aligned %s\n"), | |
236 | device); | |
237 | ||
238 | if (!force_overwrite) { | |
239 | fprintf(stderr, | |
240 | _("Use -f to force usage of a misaligned device\n")); | |
241 | ||
242 | exit(EXIT_FAILURE); | |
243 | } | |
244 | /* Do not use physical sector size if the device is misaligned */ | |
245 | *psectorsize = *lsectorsize; | |
246 | } | |
247 | ||
248 | blkid_free_probe(pr); | |
249 | return; | |
250 | ||
251 | out_free_probe: | |
252 | blkid_free_probe(pr); | |
253 | fprintf(stderr, | |
254 | _("warning: unable to probe device topology for device %s\n"), | |
255 | device); | |
256 | } | |
257 | #else /* ifdef ENABLE_BLKID */ | |
258 | /* | |
259 | * Without blkid, we can't do a good check for signatures. | |
260 | * So instead of some messy attempts, just disable any checks | |
261 | * and always return 'nothing found'. | |
262 | */ | |
263 | # warning BLKID is disabled, so signature detection and block device\ | |
264 | access are not working! | |
265 | int | |
266 | check_overwrite( | |
267 | const char *device) | |
268 | { | |
269 | return 1; | |
270 | } | |
271 | ||
272 | static void blkid_get_topology( | |
273 | const char *device, | |
274 | int *sunit, | |
275 | int *swidth, | |
276 | int *lsectorsize, | |
277 | int *psectorsize, | |
278 | int force_overwrite) | |
279 | { | |
280 | /* | |
281 | * Shouldn't make any difference (no blkid = no block device access), | |
282 | * but make sure this dummy replacement returns with at least some | |
283 | * sanity. | |
284 | */ | |
285 | *lsectorsize = *psectorsize = 512; | |
286 | } | |
287 | ||
288 | #endif /* ENABLE_BLKID */ | |
289 | ||
290 | void get_topology( | |
291 | libxfs_init_t *xi, | |
292 | struct fs_topology *ft, | |
293 | int force_overwrite) | |
294 | { | |
295 | struct stat statbuf; | |
296 | char *dfile = xi->volname ? xi->volname : xi->dname; | |
297 | ||
298 | /* | |
299 | * If our target is a regular file, use platform_findsizes | |
300 | * to try to obtain the underlying filesystem's requirements | |
301 | * for direct IO; we'll set our sector size to that if possible. | |
302 | */ | |
303 | if (xi->disfile || | |
304 | (!stat(dfile, &statbuf) && S_ISREG(statbuf.st_mode))) { | |
305 | int fd; | |
306 | int flags = O_RDONLY; | |
307 | long long dummy; | |
308 | ||
309 | /* with xi->disfile we may not have the file yet! */ | |
310 | if (xi->disfile) | |
311 | flags |= O_CREAT; | |
312 | ||
313 | fd = open(dfile, flags, 0666); | |
314 | if (fd >= 0) { | |
315 | platform_findsizes(dfile, fd, &dummy, &ft->lsectorsize); | |
316 | close(fd); | |
317 | ft->psectorsize = ft->lsectorsize; | |
318 | } else | |
319 | ft->psectorsize = ft->lsectorsize = BBSIZE; | |
320 | } else { | |
321 | blkid_get_topology(dfile, &ft->dsunit, &ft->dswidth, | |
322 | &ft->lsectorsize, &ft->psectorsize, | |
323 | force_overwrite); | |
324 | } | |
325 | ||
326 | if (xi->rtname && !xi->risfile) { | |
327 | int sunit, lsectorsize, psectorsize; | |
328 | ||
329 | blkid_get_topology(xi->rtname, &sunit, &ft->rtswidth, | |
330 | &lsectorsize, &psectorsize, force_overwrite); | |
331 | } | |
332 | } |