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Commit | Line | Data |
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30a4f2a8 | 1 | /* |
bde978a6 | 2 | * Copyright (C) 1996-2015 The Squid Software Foundation and contributors |
e25c139f | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
30a4f2a8 | 7 | */ |
ed43818f | 8 | |
bbc27441 AJ |
9 | /* DEBUG: section 06 Disk I/O Routines */ |
10 | ||
582c2af2 | 11 | #include "squid.h" |
d841c88d | 12 | #include "comm/Loops.h" |
c4ad1349 | 13 | #include "fd.h" |
528b2c61 | 14 | #include "fde.h" |
b3f7fd88 | 15 | #include "fs_io.h" |
67679543 | 16 | #include "globals.h" |
0eb49b6d | 17 | #include "MemBuf.h" |
582c2af2 | 18 | #include "profiler/Profiler.h" |
e4f1fdae | 19 | #include "StatCounters.h" |
090089c4 | 20 | |
1a30fdf5 | 21 | #include <cerrno> |
21d845b1 | 22 | |
95d15928 | 23 | static PF diskHandleRead; |
24 | static PF diskHandleWrite; | |
24382924 | 25 | |
be266cb2 | 26 | #if _SQUID_WINDOWS_ || _SQUID_OS2_ |
1a94f598 | 27 | static int |
28 | diskWriteIsComplete(int fd) | |
29 | { | |
30 | return fd_table[fd].disk.write_q ? 0 : 1; | |
31 | } | |
62e76326 | 32 | |
1a94f598 | 33 | #endif |
34 | ||
59a09b98 FC |
35 | /* hack needed on SunStudio to avoid linkage convention mismatch */ |
36 | static void cxx_xfree(void *ptr) | |
37 | { | |
f673997d | 38 | xfree(ptr); |
59a09b98 FC |
39 | } |
40 | ||
1a94f598 | 41 | /* |
42 | * opens a disk file specified by 'path'. This function always | |
43 | * blocks! There is no callback. | |
44 | */ | |
684c2720 | 45 | int |
1a94f598 | 46 | file_open(const char *path, int mode) |
090089c4 | 47 | { |
090089c4 | 48 | int fd; |
88bfe092 | 49 | PROF_start(file_open); |
62e76326 | 50 | |
5d1a7121 | 51 | if (FILE_MODE(mode) == O_WRONLY) |
62e76326 | 52 | mode |= O_APPEND; |
53 | ||
b870e0b4 | 54 | errno = 0; |
62e76326 | 55 | |
0a0bf5db | 56 | fd = open(path, mode, 0644); |
62e76326 | 57 | |
95dc7ff4 | 58 | ++ statCounter.syscalls.disk.opens; |
62e76326 | 59 | |
0a0bf5db | 60 | if (fd < 0) { |
bf8fe701 | 61 | debugs(50, 3, "file_open: error opening file " << path << ": " << xstrerror()); |
62e76326 | 62 | fd = DISK_ERROR; |
2391a162 | 63 | } else { |
bf8fe701 | 64 | debugs(6, 5, "file_open: FD " << fd); |
62e76326 | 65 | commSetCloseOnExec(fd); |
66 | fd_open(fd, FD_FILE, path); | |
090089c4 | 67 | } |
62e76326 | 68 | |
88bfe092 | 69 | PROF_stop(file_open); |
2391a162 | 70 | return fd; |
0a0bf5db | 71 | } |
72 | ||
090089c4 | 73 | /* close a disk file. */ |
95d15928 | 74 | void |
b8d8561b | 75 | file_close(int fd) |
090089c4 | 76 | { |
76f87348 | 77 | fde *F = &fd_table[fd]; |
2391a162 | 78 | PF *read_callback; |
88bfe092 | 79 | PROF_start(file_close); |
25354045 | 80 | assert(fd >= 0); |
60c0b5a2 | 81 | assert(F->flags.open); |
62e76326 | 82 | |
2391a162 | 83 | if ((read_callback = F->read_handler)) { |
62e76326 | 84 | F->read_handler = NULL; |
85 | read_callback(-1, F->read_data); | |
65d548bf | 86 | } |
62e76326 | 87 | |
0cd30ba5 | 88 | if (F->flags.write_daemon) { |
be266cb2 | 89 | #if _SQUID_WINDOWS_ || _SQUID_OS2_ |
62e76326 | 90 | /* |
91 | * on some operating systems, you can not delete or rename | |
92 | * open files, so we won't allow delayed close. | |
93 | */ | |
62e76326 | 94 | while (!diskWriteIsComplete(fd)) |
95 | diskHandleWrite(fd, NULL); | |
cd377065 | 96 | #else |
be4d35dc | 97 | F->flags.close_request = true; |
bf8fe701 | 98 | debugs(6, 2, "file_close: FD " << fd << ", delaying close"); |
62e76326 | 99 | PROF_stop(file_close); |
62e76326 | 100 | return; |
cd377065 | 101 | #endif |
62e76326 | 102 | |
fb247d78 | 103 | } |
62e76326 | 104 | |
65d548bf | 105 | /* |
106 | * Assert there is no write callback. Otherwise we might be | |
107 | * leaking write state data by closing the descriptor | |
108 | */ | |
109 | assert(F->write_handler == NULL); | |
62e76326 | 110 | |
42f99d0d | 111 | #if CALL_FSYNC_BEFORE_CLOSE |
62e76326 | 112 | |
42f99d0d | 113 | fsync(fd); |
62e76326 | 114 | |
42f99d0d | 115 | #endif |
62e76326 | 116 | |
95d15928 | 117 | close(fd); |
62e76326 | 118 | |
bf8fe701 | 119 | debugs(6, F->flags.close_request ? 2 : 5, "file_close: FD " << fd << " really closing\n"); |
62e76326 | 120 | |
6cf028ab | 121 | fd_close(fd); |
62e76326 | 122 | |
95dc7ff4 | 123 | ++ statCounter.syscalls.disk.closes; |
62e76326 | 124 | |
88bfe092 | 125 | PROF_stop(file_close); |
090089c4 | 126 | } |
127 | ||
f02b8498 | 128 | /* |
129 | * This function has the purpose of combining multiple writes. This is | |
130 | * to facilitate the ASYNC_IO option since it can only guarantee 1 | |
131 | * write to a file per trip around the comm.c select() loop. That's bad | |
132 | * because more than 1 write can be made to the access.log file per | |
133 | * trip, and so this code is purely designed to help batch multiple | |
134 | * sequential writes to the access.log file. Squid will never issue | |
135 | * multiple writes for any other file type during 1 trip around the | |
136 | * select() loop. --SLF | |
137 | */ | |
582b6456 | 138 | static void |
5fed1735 | 139 | diskCombineWrites(_fde_disk *fdd) |
090089c4 | 140 | { |
f02b8498 | 141 | /* |
142 | * We need to combine multiple write requests on an FD's write | |
143 | * queue But only if we don't need to seek() in between them, ugh! | |
144 | * XXX This currently ignores any seeks (file_offset) | |
145 | */ | |
62e76326 | 146 | |
26ac0430 | 147 | if (fdd->write_q != NULL && fdd->write_q->next != NULL) { |
b115733c | 148 | int len = 0; |
62e76326 | 149 | |
b115733c | 150 | for (dwrite_q *q = fdd->write_q; q != NULL; q = q->next) |
62e76326 | 151 | len += q->len - q->buf_offset; |
152 | ||
b115733c | 153 | dwrite_q *wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
62e76326 | 154 | |
155 | wq->buf = (char *)xmalloc(len); | |
156 | ||
157 | wq->len = 0; | |
158 | ||
159 | wq->buf_offset = 0; | |
160 | ||
161 | wq->next = NULL; | |
162 | ||
59a09b98 | 163 | wq->free_func = cxx_xfree; |
62e76326 | 164 | |
b115733c AJ |
165 | while (fdd->write_q != NULL) { |
166 | dwrite_q *q = fdd->write_q; | |
167 | ||
62e76326 | 168 | len = q->len - q->buf_offset; |
41d00cd3 | 169 | memcpy(wq->buf + wq->len, q->buf + q->buf_offset, len); |
62e76326 | 170 | wq->len += len; |
171 | fdd->write_q = q->next; | |
172 | ||
173 | if (q->free_func) | |
6ca34f6f | 174 | q->free_func(q->buf); |
62e76326 | 175 | |
b115733c AJ |
176 | memFree(q, MEM_DWRITE_Q); |
177 | }; | |
62e76326 | 178 | |
179 | fdd->write_q_tail = wq; | |
180 | ||
181 | fdd->write_q = wq; | |
0a0bf5db | 182 | } |
f02b8498 | 183 | } |
184 | ||
185 | /* write handler */ | |
186 | static void | |
ced8def3 | 187 | diskHandleWrite(int fd, void *) |
f02b8498 | 188 | { |
189 | int len = 0; | |
f02b8498 | 190 | fde *F = &fd_table[fd]; |
62e76326 | 191 | |
5fed1735 | 192 | _fde_disk *fdd = &F->disk; |
2391a162 | 193 | dwrite_q *q = fdd->write_q; |
194 | int status = DISK_OK; | |
be4d35dc | 195 | bool do_close; |
62e76326 | 196 | |
2391a162 | 197 | if (NULL == q) |
62e76326 | 198 | return; |
199 | ||
88bfe092 | 200 | PROF_start(diskHandleWrite); |
62e76326 | 201 | |
bf8fe701 | 202 | debugs(6, 3, "diskHandleWrite: FD " << fd); |
62e76326 | 203 | |
be4d35dc | 204 | F->flags.write_daemon = false; |
62e76326 | 205 | |
8350fe9b | 206 | assert(fdd->write_q != NULL); |
62e76326 | 207 | |
d377699f | 208 | assert(fdd->write_q->len > fdd->write_q->buf_offset); |
62e76326 | 209 | |
e2851fe7 AR |
210 | debugs(6, 3, "diskHandleWrite: FD " << fd << " writing " << |
211 | (fdd->write_q->len - fdd->write_q->buf_offset) << " bytes at " << | |
212 | fdd->write_q->file_offset); | |
62e76326 | 213 | |
b870e0b4 | 214 | errno = 0; |
62e76326 | 215 | |
914fbbba FC |
216 | if (fdd->write_q->file_offset != -1) { |
217 | errno = 0; | |
218 | if (lseek(fd, fdd->write_q->file_offset, SEEK_SET) == -1) { | |
3211fedb | 219 | debugs(50, DBG_IMPORTANT, "error in seek for fd " << fd << ": " << xstrerror()); |
914fbbba FC |
220 | // XXX: handle error? |
221 | } | |
222 | } | |
62e76326 | 223 | |
1f7c9178 | 224 | len = FD_WRITE_METHOD(fd, |
62e76326 | 225 | fdd->write_q->buf + fdd->write_q->buf_offset, |
226 | fdd->write_q->len - fdd->write_q->buf_offset); | |
227 | ||
bf8fe701 | 228 | debugs(6, 3, "diskHandleWrite: FD " << fd << " len = " << len); |
62e76326 | 229 | |
95dc7ff4 | 230 | ++ statCounter.syscalls.disk.writes; |
62e76326 | 231 | |
6cf028ab | 232 | fd_bytes(fd, len, FD_WRITE); |
62e76326 | 233 | |
0a0bf5db | 234 | if (len < 0) { |
62e76326 | 235 | if (!ignoreErrno(errno)) { |
236 | status = errno == ENOSPC ? DISK_NO_SPACE_LEFT : DISK_ERROR; | |
e0236918 | 237 | debugs(50, DBG_IMPORTANT, "diskHandleWrite: FD " << fd << ": disk write error: " << xstrerror()); |
bf8fe701 | 238 | |
62e76326 | 239 | /* |
240 | * If there is no write callback, then this file is | |
241 | * most likely something important like a log file, or | |
242 | * an interprocess pipe. Its not a swapfile. We feel | |
243 | * that a write failure on a log file is rather important, | |
244 | * and Squid doesn't otherwise deal with this condition. | |
245 | * So to get the administrators attention, we exit with | |
246 | * a fatal message. | |
247 | */ | |
248 | ||
249 | if (fdd->wrt_handle == NULL) | |
250 | fatal("Write failure -- check your disk space and cache.log"); | |
251 | ||
252 | /* | |
253 | * If there is a write failure, then we notify the | |
254 | * upper layer via the callback, at the end of this | |
255 | * function. Meanwhile, flush all pending buffers | |
256 | * here. Let the upper layer decide how to handle the | |
257 | * failure. This will prevent experiencing multiple, | |
258 | * repeated write failures for the same FD because of | |
259 | * the queued data. | |
260 | */ | |
261 | do { | |
262 | fdd->write_q = q->next; | |
263 | ||
264 | if (q->free_func) | |
6ca34f6f | 265 | q->free_func(q->buf); |
62e76326 | 266 | |
267 | if (q) { | |
268 | memFree(q, MEM_DWRITE_Q); | |
269 | q = NULL; | |
270 | } | |
271 | } while ((q = fdd->write_q)); | |
272 | } | |
273 | ||
274 | len = 0; | |
0a0bf5db | 275 | } |
62e76326 | 276 | |
8350fe9b | 277 | if (q != NULL) { |
62e76326 | 278 | /* q might become NULL from write failure above */ |
279 | q->buf_offset += len; | |
280 | ||
281 | if (q->buf_offset > q->len) | |
e0236918 | 282 | debugs(50, DBG_IMPORTANT, "diskHandleWriteComplete: q->buf_offset > q->len (" << |
bf8fe701 | 283 | q << "," << (int) q->buf_offset << ", " << q->len << ", " << |
284 | len << " FD " << fd << ")"); | |
285 | ||
62e76326 | 286 | assert(q->buf_offset <= q->len); |
287 | ||
288 | if (q->buf_offset == q->len) { | |
289 | /* complete write */ | |
290 | fdd->write_q = q->next; | |
291 | ||
292 | if (q->free_func) | |
6ca34f6f | 293 | q->free_func(q->buf); |
62e76326 | 294 | |
295 | if (q) { | |
296 | memFree(q, MEM_DWRITE_Q); | |
297 | q = NULL; | |
298 | } | |
299 | } | |
090089c4 | 300 | } |
62e76326 | 301 | |
de866d20 | 302 | if (fdd->write_q == NULL) { |
62e76326 | 303 | /* no more data */ |
304 | fdd->write_q_tail = NULL; | |
de866d20 | 305 | } else { |
62e76326 | 306 | /* another block is queued */ |
307 | diskCombineWrites(fdd); | |
d841c88d | 308 | Comm::SetSelect(fd, COMM_SELECT_WRITE, diskHandleWrite, NULL, 0); |
be4d35dc | 309 | F->flags.write_daemon = true; |
4a86108c | 310 | } |
62e76326 | 311 | |
0cd30ba5 | 312 | do_close = F->flags.close_request; |
62e76326 | 313 | |
25354045 | 314 | if (fdd->wrt_handle) { |
62e76326 | 315 | DWCB *callback = fdd->wrt_handle; |
316 | void *cbdata; | |
317 | fdd->wrt_handle = NULL; | |
318 | ||
319 | if (cbdataReferenceValidDone(fdd->wrt_handle_data, &cbdata)) { | |
320 | callback(fd, status, len, cbdata); | |
321 | /* | |
322 | * NOTE, this callback can close the FD, so we must | |
323 | * not touch 'F', 'fdd', etc. after this. | |
324 | */ | |
325 | PROF_stop(diskHandleWrite); | |
326 | return; | |
327 | /* XXX But what about close_request??? */ | |
328 | } | |
25354045 | 329 | } |
62e76326 | 330 | |
68c21f71 | 331 | if (do_close) |
62e76326 | 332 | file_close(fd); |
333 | ||
88bfe092 | 334 | PROF_stop(diskHandleWrite); |
090089c4 | 335 | } |
336 | ||
090089c4 | 337 | /* write block to a file */ |
338 | /* write back queue. Only one writer at a time. */ | |
339 | /* call a handle when writing is complete. */ | |
e3ef2b09 | 340 | void |
3ebcfaa1 | 341 | file_write(int fd, |
62e76326 | 342 | off_t file_offset, |
343 | void const *ptr_to_buf, | |
344 | int len, | |
345 | DWCB * handle, | |
346 | void *handle_data, | |
347 | FREE * free_func) | |
090089c4 | 348 | { |
c6ac7aae | 349 | dwrite_q *wq = NULL; |
48cc3fcf | 350 | fde *F = &fd_table[fd]; |
88bfe092 | 351 | PROF_start(file_write); |
48cc3fcf | 352 | assert(fd >= 0); |
60c0b5a2 | 353 | assert(F->flags.open); |
090089c4 | 354 | /* if we got here. Caller is eligible to write. */ |
e6ccf245 | 355 | wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
d377699f | 356 | wq->file_offset = file_offset; |
e6ccf245 | 357 | wq->buf = (char *)ptr_to_buf; |
090089c4 | 358 | wq->len = len; |
d377699f | 359 | wq->buf_offset = 0; |
090089c4 | 360 | wq->next = NULL; |
ed7f0b6a | 361 | wq->free_func = free_func; |
62e76326 | 362 | |
fa80a8ef | 363 | if (!F->disk.wrt_handle_data) { |
62e76326 | 364 | F->disk.wrt_handle = handle; |
365 | F->disk.wrt_handle_data = cbdataReference(handle_data); | |
fa80a8ef | 366 | } else { |
62e76326 | 367 | /* Detect if there is multiple concurrent users of this fd.. we only support one callback */ |
368 | assert(F->disk.wrt_handle_data == handle_data && F->disk.wrt_handle == handle); | |
fa80a8ef | 369 | } |
62e76326 | 370 | |
090089c4 | 371 | /* add to queue */ |
48cc3fcf | 372 | if (F->disk.write_q == NULL) { |
62e76326 | 373 | /* empty queue */ |
374 | F->disk.write_q = F->disk.write_q_tail = wq; | |
090089c4 | 375 | } else { |
62e76326 | 376 | F->disk.write_q_tail->next = wq; |
377 | F->disk.write_q_tail = wq; | |
090089c4 | 378 | } |
62e76326 | 379 | |
0cd30ba5 | 380 | if (!F->flags.write_daemon) { |
62e76326 | 381 | diskHandleWrite(fd, NULL); |
429fdbec | 382 | } |
62e76326 | 383 | |
88bfe092 | 384 | PROF_stop(file_write); |
090089c4 | 385 | } |
386 | ||
23b2b404 | 387 | /* |
388 | * a wrapper around file_write to allow for MemBuf to be file_written | |
389 | * in a snap | |
390 | */ | |
137ee196 | 391 | void |
392 | file_write_mbuf(int fd, off_t off, MemBuf mb, DWCB * handler, void *handler_data) | |
393 | { | |
2fe7eff9 | 394 | file_write(fd, off, mb.buf, mb.size, handler, handler_data, mb.freeFunc()); |
137ee196 | 395 | } |
090089c4 | 396 | |
397 | /* Read from FD */ | |
582b6456 | 398 | static void |
399 | diskHandleRead(int fd, void *data) | |
090089c4 | 400 | { |
e6ccf245 | 401 | dread_ctrl *ctrl_dat = (dread_ctrl *)data; |
edd2eb63 | 402 | fde *F = &fd_table[fd]; |
090089c4 | 403 | int len; |
2391a162 | 404 | int rc = DISK_OK; |
65d548bf | 405 | /* |
406 | * FD < 0 indicates premature close; we just have to free | |
407 | * the state data. | |
408 | */ | |
62e76326 | 409 | |
65d548bf | 410 | if (fd < 0) { |
62e76326 | 411 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
412 | return; | |
65d548bf | 413 | } |
62e76326 | 414 | |
88bfe092 | 415 | PROF_start(diskHandleRead); |
62e76326 | 416 | |
034b5ea4 | 417 | #if WRITES_MAINTAIN_DISK_OFFSET |
711982d8 | 418 | if (F->disk.offset != ctrl_dat->offset) { |
034b5ea4 AR |
419 | #else |
420 | { | |
421 | #endif | |
4a7a3d56 | 422 | debugs(6, 3, "diskHandleRead: FD " << fd << " seeking to offset " << ctrl_dat->offset); |
4ab1af1f FC |
423 | errno = 0; |
424 | if (lseek(fd, ctrl_dat->offset, SEEK_SET) == -1) { | |
425 | // shouldn't happen, let's detect that | |
3211fedb | 426 | debugs(50, DBG_IMPORTANT, "error in seek for fd " << fd << ": " << xstrerror()); |
4ab1af1f FC |
427 | // XXX handle failures? |
428 | } | |
95dc7ff4 | 429 | ++ statCounter.syscalls.disk.seeks; |
62e76326 | 430 | F->disk.offset = ctrl_dat->offset; |
711982d8 | 431 | } |
62e76326 | 432 | |
b870e0b4 | 433 | errno = 0; |
1f7c9178 | 434 | len = FD_READ_METHOD(fd, ctrl_dat->buf, ctrl_dat->req_len); |
62e76326 | 435 | |
015b507a | 436 | if (len > 0) |
62e76326 | 437 | F->disk.offset += len; |
438 | ||
95dc7ff4 | 439 | ++ statCounter.syscalls.disk.reads; |
62e76326 | 440 | |
4f92c80c | 441 | fd_bytes(fd, len, FD_READ); |
62e76326 | 442 | |
0a0bf5db | 443 | if (len < 0) { |
62e76326 | 444 | if (ignoreErrno(errno)) { |
d841c88d | 445 | Comm::SetSelect(fd, COMM_SELECT_READ, diskHandleRead, ctrl_dat, 0); |
62e76326 | 446 | PROF_stop(diskHandleRead); |
447 | return; | |
448 | } | |
449 | ||
e0236918 | 450 | debugs(50, DBG_IMPORTANT, "diskHandleRead: FD " << fd << ": " << xstrerror()); |
62e76326 | 451 | len = 0; |
452 | rc = DISK_ERROR; | |
090089c4 | 453 | } else if (len == 0) { |
62e76326 | 454 | rc = DISK_EOF; |
090089c4 | 455 | } |
62e76326 | 456 | |
fa80a8ef | 457 | if (cbdataReferenceValid(ctrl_dat->client_data)) |
62e76326 | 458 | ctrl_dat->handler(fd, ctrl_dat->buf, len, rc, ctrl_dat->client_data); |
459 | ||
fa80a8ef | 460 | cbdataReferenceDone(ctrl_dat->client_data); |
62e76326 | 461 | |
db1cd23c | 462 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
62e76326 | 463 | |
88bfe092 | 464 | PROF_stop(diskHandleRead); |
090089c4 | 465 | } |
466 | ||
090089c4 | 467 | /* start read operation */ |
62e76326 | 468 | /* buffer must be allocated from the caller. |
26ac0430 | 469 | * It must have at least req_len space in there. |
090089c4 | 470 | * call handler when a reading is complete. */ |
2391a162 | 471 | void |
d377699f | 472 | file_read(int fd, char *buf, int req_len, off_t offset, DRCB * handler, void *client_data) |
090089c4 | 473 | { |
474 | dread_ctrl *ctrl_dat; | |
88bfe092 | 475 | PROF_start(file_read); |
711982d8 | 476 | assert(fd >= 0); |
e6ccf245 | 477 | ctrl_dat = (dread_ctrl *)memAllocate(MEM_DREAD_CTRL); |
090089c4 | 478 | ctrl_dat->fd = fd; |
479 | ctrl_dat->offset = offset; | |
480 | ctrl_dat->req_len = req_len; | |
481 | ctrl_dat->buf = buf; | |
090089c4 | 482 | ctrl_dat->end_of_file = 0; |
483 | ctrl_dat->handler = handler; | |
fa80a8ef | 484 | ctrl_dat->client_data = cbdataReference(client_data); |
0a0bf5db | 485 | diskHandleRead(fd, ctrl_dat); |
88bfe092 | 486 | PROF_stop(file_read); |
090089c4 | 487 | } |
c8f4eac4 | 488 | |
489 | void | |
490 | safeunlink(const char *s, int quiet) | |
491 | { | |
95dc7ff4 | 492 | ++ statCounter.syscalls.disk.unlinks; |
c8f4eac4 | 493 | |
494 | if (unlink(s) < 0 && !quiet) | |
e0236918 | 495 | debugs(50, DBG_IMPORTANT, "safeunlink: Couldn't delete " << s << ": " << xstrerror()); |
c8f4eac4 | 496 | } |
497 | ||
498 | /* | |
499 | * Same as rename(2) but complains if something goes wrong; | |
26ac0430 | 500 | * the caller is responsible for handing and explaining the |
c8f4eac4 | 501 | * consequences of errors. |
502 | */ | |
503 | int | |
504 | xrename(const char *from, const char *to) | |
505 | { | |
bf8fe701 | 506 | debugs(21, 2, "xrename: renaming " << from << " to " << to); |
be266cb2 | 507 | #if _SQUID_OS2_ || _SQUID_WINDOWS_ |
6ca34f6f | 508 | remove(to); |
c8f4eac4 | 509 | #endif |
510 | ||
511 | if (0 == rename(from, to)) | |
512 | return 0; | |
513 | ||
bf8fe701 | 514 | debugs(21, errno == ENOENT ? 2 : 1, "xrename: Cannot rename " << from << " to " << to << ": " << xstrerror()); |
c8f4eac4 | 515 | |
516 | return -1; | |
517 | } | |
518 | ||
2745fea5 AR |
519 | int |
520 | fsBlockSize(const char *path, int *blksize) | |
521 | { | |
522 | struct statvfs sfs; | |
523 | ||
524 | if (xstatvfs(path, &sfs)) { | |
525 | debugs(50, DBG_IMPORTANT, "" << path << ": " << xstrerror()); | |
526 | *blksize = 2048; | |
527 | return 1; | |
528 | } | |
529 | ||
530 | *blksize = (int) sfs.f_frsize; | |
531 | ||
532 | // Sanity check; make sure we have a meaningful value. | |
533 | if (*blksize < 512) | |
534 | *blksize = 2048; | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | #define fsbtoblk(num, fsbs, bs) \ | |
540 | (((fsbs) != 0 && (fsbs) < (bs)) ? \ | |
541 | (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs))) | |
542 | int | |
543 | fsStats(const char *path, int *totl_kb, int *free_kb, int *totl_in, int *free_in) | |
544 | { | |
545 | struct statvfs sfs; | |
546 | ||
547 | if (xstatvfs(path, &sfs)) { | |
548 | debugs(50, DBG_IMPORTANT, "" << path << ": " << xstrerror()); | |
549 | return 1; | |
550 | } | |
551 | ||
552 | *totl_kb = (int) fsbtoblk(sfs.f_blocks, sfs.f_frsize, 1024); | |
553 | *free_kb = (int) fsbtoblk(sfs.f_bfree, sfs.f_frsize, 1024); | |
554 | *totl_in = (int) sfs.f_files; | |
555 | *free_in = (int) sfs.f_ffree; | |
556 | return 0; | |
557 | } |