1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2001 Silicon Graphics, Inc.
18 /*---------------------------------------------------------------------------
20 Test program used to test the DMAPI function dm_get_allocinfo(). The
23 get_allocinfo [-D] [-n nelem] [-o offp] [-s sid] pathname
25 where pathname is the name of a file, 'offp' is a byte offset from the
26 beginning of the file where you want to start dumping, and 'nelem' allows
27 you to specify how many extent structures to use in each dm_get_allocinfo
30 The code checks the returned extents as much as possible for errors.
31 It detects bad ex_type values, verifies that there is always a trailing
32 hole at the end of the file, that the ex_offset of each extent matches the
33 ex_offset+ex_length of the previous extent, and that ex_offset+ex_length
34 is always an even multiple of 512. It verifies that all ex_offset values
35 after the first fall on a 512-byte boundary. It verifies that the '*offp'
36 value returned by dm_get_allocinfo() is 0 at the end of the file, and
37 equals ex_offset+ex_length of the last extent if not at the end of the file.
38 Any error is reported to stderr, and the program then terminates with a
41 The program produces output similar to xfs_bmap in order to make comparison
42 easier. Here is some sample output.
46 0: [0..127]: resv [1..511]
48 Line 1 gives the name of the file and the byte offset within the file where
49 the dump started. Line 2 appears once for each dm_get_allocinfo() call,
50 giving the return value (rc) and the number of extents which were returned.
51 Line 3 is repeated once for each extent. The first field "0:" is the extent
52 number. The second field "[0..127]:" give the starting and ending block for
53 the extent in 512-byte units. The third field is either "resv" to indicate
54 allocated space or "hole" if the extent is a hole. The fourth field
55 "[1..511]" only appears if the dump did not start with byte zero of the
56 first block. In that case, the first number shows the actual byte offset
57 within the block (1 in this case). The second number should always be
58 511 since we always dump to the end of a block.
63 Dump some holey files and compare the output of this program with xfs_bmap.
65 Produce a file with holes, and perform the following tests using just one
67 Dump extents from beginning of the file.
68 Dump from byte 1 of the file.
69 Dump from the last byte of the first extent.
70 Dump from the first byte of the second extent.
71 Dump from the middle of the second extent.
72 Dump the first byte of the last extent.
73 Dump the last byte of the last extent.
74 Dump the first byte after the last extent.
75 Dump starting at an offset way past the end of the file.
77 Produce a fragmented file with many adjacent DM_EXTENT_RES extents.
78 Repeat the above tests.
80 Produce a GRIO file with holes.
81 Repeat the above tests.
83 Run the following shell script.
87 # Dump the same holey file $max times, each time using one less extent
88 # structure than the previous time. The grep and diff code
89 # checks to make sure that you get the same answer each time, no matter
90 # how many extents you use. If all is okay, The only messages you will
91 # see are the "trial $num" messages.
93 max=20 # should be bigger than the number extents in the file
99 ./test_alloc -e $num f1 | grep '\[' > x.$num
107 ----------------------------------------------------------------------------*/
110 extern char *sys_errlist[];
115 static int print_alloc(dm_sessid_t sid, void* hanp, size_t hlen,
116 char *pathname, dm_off_t startoff, u_int nelem);
125 fprintf(stderr, "usage:\t%s [-D] [-n nelem] [-o off] [-s sid] "
126 "pathname\n", Progname);
136 dm_sessid_t sid = DM_NO_SESSION;
137 dm_off_t startoff = 0; /* starting offset */
146 Progname = strrchr(argv[0], '/');
153 /* Crack and validate the command line options. */
155 while ((opt = getopt(argc, argv, "Dn:o:s:")) != EOF) {
161 nelem = atol(optarg);
164 startoff = atoll(optarg);
173 if (optind + 1 != argc)
175 pathname = argv[optind];
177 if (dm_init_service(&name)) {
178 fprintf(stderr, "dm_init_service failed, %s\n",
183 if (sid == DM_NO_SESSION)
184 find_test_session(&sid);
186 /* Get the file's handle and verify that it is a regular file. */
188 if (dm_path_to_handle(pathname, &hanp, &hlen)) {
189 fprintf(stderr, "can't get handle for %s\n", pathname);
192 if (dm_get_fileattr(sid, hanp, hlen, DM_NO_TOKEN, DM_AT_STAT, &sbuf)) {
193 fprintf(stderr, "dm_get_fileattr failed\n");
196 if (!S_ISREG(sbuf.dt_mode)) {
197 fprintf(stderr, "%s is not a regular file\n", pathname);
201 /* Print the allocation. */
203 if (print_alloc(sid, hanp, hlen, pathname, startoff, nelem))
206 dm_handle_free(hanp, hlen);
228 fprintf(stdout, "%s: starting offset %lld\n", pathname,
229 (long long) startoff);
231 /* Allocate space for the number of extents requested by the user. */
233 if ((extent = malloc(nelem * sizeof(*extent))) == NULL) {
234 fprintf(stderr, "can't malloc extent structures\n");
242 rc = dm_get_allocinfo(sid, hanp, hlen, DM_NO_TOKEN, &startoff,
243 nelem, extent, &nelemp);
246 fprintf(stderr, "dm_get_allocinfo failed, %s\n",
251 fprintf(stdout, "\treturned %d, nelemp %d\n", rc, nelemp);
253 fprintf(stdout, " ex_type ex_offset ex_length\n");
255 /* Note: it is possible for nelemp to be zero! */
257 for (i = 0; i < nelemp; i++) {
258 /* The extent must either be reserved space or a hole.
261 switch (extent[i].ex_type) {
269 fprintf(stderr, "invalid extent type %d\n",
275 fprintf(stdout, "\t%d: [%lld..%lld]: %s", num,
276 (long long) extent[i].ex_offset / 512,
277 (long long) (extent[i].ex_offset +
278 extent[i].ex_length - 1) / 512, type);
279 if ((extent[i].ex_offset % 512 != 0) ||
280 (endoff % 512 != 0)) {
281 fprintf(stdout, "\t[%lld..%lld]\n",
282 (long long) extent[i].ex_offset % 512,
283 (long long) (endoff-1) % 512);
285 fprintf(stdout, "\n");
288 fprintf(stdout, "%5s %13lld %13lld\n",
289 type, (long long) extent[i].ex_offset,
290 (long long) extent[i].ex_length);
293 /* The ex_offset of the first extent should match the
294 'startoff' specified by the caller. The ex_offset
295 in subsequent extents should always match
296 (ex_offset + ex_length) of the previous extent,
297 and should always start on a 512 byte boundary.
300 if (extent[i].ex_offset != endoff) {
301 fprintf(stderr, "new extent (%lld)is not "
302 "adjacent to previous one (%lld)\n",
303 (long long) extent[i].ex_offset,
307 if (num && (extent[i].ex_offset % 512) != 0) {
308 fprintf(stderr, "non-initial ex_offset (%lld) "
309 "is not a 512-byte multiple\n",
310 (long long) extent[i].ex_offset);
314 /* Non-initial extents should have ex_length values
315 that are an even multiple of 512. The initial
316 extent should be a multiple of 512 less the offset
317 into the starting 512-byte block.
320 if (((extent[i].ex_offset % 512) + extent[i].ex_length) % 512 != 0) {
321 fprintf(stderr, "ex_length is incorrect based "
322 "upon the ex_offset\n");
326 endoff = extent[i].ex_offset + extent[i].ex_length;
327 num++; /* count of extents printed */
330 /* If not yet at end of file, the startoff parameter should
331 match the ex_offset plus ex_length of the last extent
335 if (rc && startoff != endoff) {
336 fprintf(stderr, "startoff is %lld, should be %lld\n",
337 (long long) startoff, (long long) endoff);
341 /* If we are at end of file, the last extent should be a
345 if (!rc && type && strcmp(type, "hole")) {
346 fprintf(stderr, "file didn't end with a hole\n");
351 /* At end of file, startoff should always equal zero. */
354 fprintf(stderr, "ERROR: startoff was not zero at end of file\n");