Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| 2 | |
| 3 | /*** |
| 4 | This file is part of systemd. |
| 5 | |
| 6 | Copyright 2010 Lennart Poettering |
| 7 | |
| 8 | systemd is free software; you can redistribute it and/or modify it |
Lennart Poettering | 5430f7f | 2012-04-12 00:20:58 +0200 | [diff] [blame] | 9 | under the terms of the GNU Lesser General Public License as published by |
| 10 | the Free Software Foundation; either version 2.1 of the License, or |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 11 | (at your option) any later version. |
| 12 | |
| 13 | systemd is distributed in the hope that it will be useful, but |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
Lennart Poettering | 5430f7f | 2012-04-12 00:20:58 +0200 | [diff] [blame] | 16 | Lesser General Public License for more details. |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 17 | |
Lennart Poettering | 5430f7f | 2012-04-12 00:20:58 +0200 | [diff] [blame] | 18 | You should have received a copy of the GNU Lesser General Public License |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| 20 | ***/ |
| 21 | |
| 22 | #include <errno.h> |
| 23 | #include <inttypes.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <linux/limits.h> |
| 26 | #include <stdbool.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <sys/select.h> |
| 31 | #include <sys/time.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <unistd.h> |
Lennart Poettering | 8260358 | 2010-09-25 15:39:38 +0200 | [diff] [blame] | 35 | #include <getopt.h> |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 36 | #include <sys/inotify.h> |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 37 | |
Lennart Poettering | 81527be | 2012-01-05 16:01:58 +0100 | [diff] [blame] | 38 | #include <systemd/sd-daemon.h> |
| 39 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 40 | #include "missing.h" |
| 41 | #include "util.h" |
| 42 | #include "set.h" |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 43 | #include "ioprio.h" |
| 44 | #include "readahead-common.h" |
Lennart Poettering | b52aae1 | 2011-09-23 17:00:33 +0200 | [diff] [blame] | 45 | #include "virt.h" |
Lennart Poettering | 8260358 | 2010-09-25 15:39:38 +0200 | [diff] [blame] | 46 | |
Lennart Poettering | d9c7a87 | 2010-09-28 21:46:14 +0200 | [diff] [blame] | 47 | static ReadaheadShared *shared = NULL; |
| 48 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 49 | static int unpack_file(FILE *pack) { |
| 50 | char fn[PATH_MAX]; |
| 51 | int r = 0, fd = -1; |
| 52 | bool any = false; |
| 53 | struct stat st; |
Lennart Poettering | 189455a | 2012-05-04 00:34:12 +0200 | [diff] [blame] | 54 | uint64_t inode; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 55 | |
| 56 | assert(pack); |
| 57 | |
| 58 | if (!fgets(fn, sizeof(fn), pack)) |
| 59 | return 0; |
| 60 | |
| 61 | char_array_0(fn); |
| 62 | truncate_nl(fn); |
| 63 | |
Lennart Poettering | 189455a | 2012-05-04 00:34:12 +0200 | [diff] [blame] | 64 | fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW); |
| 65 | if (fd < 0) { |
Lennart Poettering | a78899f | 2011-01-04 23:42:58 +0100 | [diff] [blame] | 66 | |
Lennart Poettering | 1c981ff | 2013-01-03 22:37:38 +0100 | [diff] [blame] | 67 | if (errno != ENOENT && errno != EPERM && errno != EACCES && errno != ELOOP) |
Lennart Poettering | a78899f | 2011-01-04 23:42:58 +0100 | [diff] [blame] | 68 | log_warning("open(%s) failed: %m", fn); |
| 69 | |
Lennart Poettering | 03e334a | 2014-03-18 19:22:43 +0100 | [diff] [blame] | 70 | } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) |
| 71 | fd = safe_close(fd); |
Lennart Poettering | 189455a | 2012-05-04 00:34:12 +0200 | [diff] [blame] | 72 | |
| 73 | if (fread(&inode, sizeof(inode), 1, pack) != 1) { |
| 74 | log_error("Premature end of pack file."); |
| 75 | r = -EIO; |
| 76 | goto finish; |
| 77 | } |
| 78 | |
| 79 | if (fd >= 0) { |
| 80 | /* If the inode changed the file got deleted, so just |
| 81 | * ignore this entry */ |
Lennart Poettering | 03e334a | 2014-03-18 19:22:43 +0100 | [diff] [blame] | 82 | if (st.st_ino != (uint64_t) inode) |
| 83 | fd = safe_close(fd); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | for (;;) { |
| 87 | uint32_t b, c; |
| 88 | |
| 89 | if (fread(&b, sizeof(b), 1, pack) != 1 || |
| 90 | fread(&c, sizeof(c), 1, pack) != 1) { |
| 91 | log_error("Premature end of pack file."); |
| 92 | r = -EIO; |
| 93 | goto finish; |
| 94 | } |
| 95 | |
| 96 | if (b == 0 && c == 0) |
| 97 | break; |
| 98 | |
| 99 | if (c <= b) { |
| 100 | log_error("Invalid pack file."); |
| 101 | r = -EIO; |
| 102 | goto finish; |
| 103 | } |
| 104 | |
| 105 | log_debug("%s: page %u to %u", fn, b, c); |
| 106 | |
| 107 | any = true; |
| 108 | |
| 109 | if (fd >= 0) |
cee1 | 37f85e6 | 2011-03-18 10:03:41 +0800 | [diff] [blame] | 110 | if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) { |
Harald Hoyer | 6e66797 | 2010-09-24 12:54:05 +0200 | [diff] [blame] | 111 | log_warning("posix_fadvise() failed: %m"); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 112 | goto finish; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | if (!any && fd >= 0) { |
| 117 | /* if no range is encoded in the pack file this is |
| 118 | * intended to mean that the whole file shall be |
| 119 | * read */ |
| 120 | |
Harald Hoyer | 6e66797 | 2010-09-24 12:54:05 +0200 | [diff] [blame] | 121 | if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) { |
| 122 | log_warning("posix_fadvise() failed: %m"); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 123 | goto finish; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | finish: |
Lennart Poettering | 03e334a | 2014-03-18 19:22:43 +0100 | [diff] [blame] | 128 | safe_close(fd); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 129 | |
| 130 | return r; |
| 131 | } |
| 132 | |
| 133 | static int replay(const char *root) { |
Lennart Poettering | 858209c | 2010-09-27 03:24:39 +0200 | [diff] [blame] | 134 | FILE *pack = NULL; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 135 | char line[LINE_MAX]; |
| 136 | int r = 0; |
Lennart Poettering | da19d5c | 2011-03-31 15:35:40 +0200 | [diff] [blame] | 137 | char *pack_fn = NULL; |
| 138 | int c; |
Lennart Poettering | 902a339 | 2010-09-25 13:47:31 +0200 | [diff] [blame] | 139 | bool on_ssd, ready = false; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 140 | int prio; |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 141 | int inotify_fd = -1; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 142 | |
| 143 | assert(root); |
| 144 | |
Lennart Poettering | 6de338a | 2012-05-04 00:13:20 +0200 | [diff] [blame] | 145 | block_bump_request_nr(root); |
Lennart Poettering | 75a010e | 2010-09-25 14:35:34 +0200 | [diff] [blame] | 146 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 147 | if (asprintf(&pack_fn, "%s/.readahead", root) < 0) { |
Shawn Landden | 0d0f0c5 | 2012-07-25 14:55:59 -0700 | [diff] [blame] | 148 | r = log_oom(); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 149 | goto finish; |
| 150 | } |
| 151 | |
Lennart Poettering | ebfb750 | 2012-06-22 00:03:25 +0200 | [diff] [blame] | 152 | pack = fopen(pack_fn, "re"); |
| 153 | if (!pack) { |
Lennart Poettering | a78899f | 2011-01-04 23:42:58 +0100 | [diff] [blame] | 154 | if (errno == ENOENT) |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 155 | log_debug("No pack file found."); |
| 156 | else { |
| 157 | log_error("Failed to open pack file: %m"); |
| 158 | r = -errno; |
| 159 | } |
| 160 | |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 161 | goto finish; |
| 162 | } |
| 163 | |
Lennart Poettering | bdb0e14 | 2010-09-29 03:11:35 +0200 | [diff] [blame] | 164 | posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED); |
| 165 | |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 166 | if ((inotify_fd = open_inotify()) < 0) { |
| 167 | r = inotify_fd; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 168 | goto finish; |
| 169 | } |
| 170 | |
| 171 | if (!(fgets(line, sizeof(line), pack))) { |
| 172 | log_error("Premature end of pack file."); |
| 173 | r = -EIO; |
| 174 | goto finish; |
| 175 | } |
| 176 | |
| 177 | char_array_0(line); |
| 178 | |
Auke Kok | cae544b | 2012-06-05 13:32:20 -0700 | [diff] [blame] | 179 | if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) { |
Lennart Poettering | 189455a | 2012-05-04 00:34:12 +0200 | [diff] [blame] | 180 | log_debug("Pack file host or version type mismatch."); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 181 | goto finish; |
| 182 | } |
| 183 | |
| 184 | if ((c = getc(pack)) == EOF) { |
| 185 | log_debug("Premature end of pack file."); |
| 186 | r = -EIO; |
| 187 | goto finish; |
| 188 | } |
| 189 | |
| 190 | /* We do not retest SSD here, so that we can start replaying |
| 191 | * before udev is up.*/ |
| 192 | on_ssd = c == 'S'; |
| 193 | log_debug("On SSD: %s", yes_no(on_ssd)); |
| 194 | |
| 195 | if (on_ssd) |
| 196 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0); |
| 197 | else |
Lennart Poettering | 05aa9ed | 2012-01-21 02:51:13 +0100 | [diff] [blame] | 198 | /* We are not using RT here, since we'd starve IO that |
| 199 | we didn't record (which is for example blkid, since |
| 200 | its disk accesses go directly to the block device and |
| 201 | are thus not visible in fallocate) to death. However, |
| 202 | we do ask for an IO prio that is slightly higher than |
| 203 | the default (which is BE. 4) */ |
| 204 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 205 | |
| 206 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0) |
| 207 | log_warning("Failed to set IDLE IO priority class: %m"); |
| 208 | |
Lennart Poettering | 902a339 | 2010-09-25 13:47:31 +0200 | [diff] [blame] | 209 | sd_notify(0, "STATUS=Replaying readahead data"); |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 210 | |
| 211 | log_debug("Replaying..."); |
| 212 | |
Kay Sievers | 2b583ce | 2011-03-25 05:07:20 +0100 | [diff] [blame] | 213 | if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) { |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 214 | log_debug("Got termination request"); |
| 215 | goto done; |
| 216 | } |
| 217 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 218 | while (!feof(pack) && !ferror(pack)) { |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 219 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 220 | int k; |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 221 | ssize_t n; |
| 222 | |
| 223 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { |
| 224 | if (errno != EINTR && errno != EAGAIN) { |
| 225 | log_error("Failed to read inotify event: %m"); |
| 226 | r = -errno; |
| 227 | goto finish; |
| 228 | } |
| 229 | } else { |
| 230 | struct inotify_event *e = (struct inotify_event*) inotify_buffer; |
| 231 | |
| 232 | while (n > 0) { |
| 233 | size_t step; |
| 234 | |
| 235 | if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) { |
| 236 | log_debug("Got termination request"); |
| 237 | goto done; |
| 238 | } |
| 239 | |
| 240 | step = sizeof(struct inotify_event) + e->len; |
| 241 | assert(step <= (size_t) n); |
| 242 | |
| 243 | e = (struct inotify_event*) ((uint8_t*) e + step); |
| 244 | n -= step; |
| 245 | } |
| 246 | } |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 247 | |
| 248 | if ((k = unpack_file(pack)) < 0) { |
| 249 | r = k; |
| 250 | goto finish; |
| 251 | } |
Lennart Poettering | 902a339 | 2010-09-25 13:47:31 +0200 | [diff] [blame] | 252 | |
| 253 | if (!ready) { |
| 254 | /* We delay the ready notification until we |
| 255 | * queued at least one read */ |
| 256 | sd_notify(0, "READY=1"); |
| 257 | ready = true; |
| 258 | } |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 259 | } |
| 260 | |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 261 | done: |
Lennart Poettering | 902a339 | 2010-09-25 13:47:31 +0200 | [diff] [blame] | 262 | if (!ready) |
| 263 | sd_notify(0, "READY=1"); |
| 264 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 265 | if (ferror(pack)) { |
| 266 | log_error("Failed to read pack file."); |
| 267 | r = -EIO; |
| 268 | goto finish; |
| 269 | } |
| 270 | |
| 271 | log_debug("Done."); |
| 272 | |
| 273 | finish: |
| 274 | if (pack) |
| 275 | fclose(pack); |
| 276 | |
Lennart Poettering | 03e334a | 2014-03-18 19:22:43 +0100 | [diff] [blame] | 277 | safe_close(inotify_fd); |
Lennart Poettering | 6624768 | 2010-09-26 15:50:14 +0200 | [diff] [blame] | 278 | |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 279 | free(pack_fn); |
| 280 | |
| 281 | return r; |
| 282 | } |
| 283 | |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 284 | int main_replay(const char *root) { |
Lennart Poettering | 8260358 | 2010-09-25 15:39:38 +0200 | [diff] [blame] | 285 | |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 286 | if (!root) |
| 287 | root = "/"; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 288 | |
Lennart Poettering | 41a598e | 2010-09-25 13:32:54 +0200 | [diff] [blame] | 289 | if (!enough_ram()) { |
| 290 | log_info("Disabling readahead replay due to low memory."); |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 291 | return EXIT_SUCCESS; |
Lennart Poettering | 41a598e | 2010-09-25 13:32:54 +0200 | [diff] [blame] | 292 | } |
| 293 | |
Lennart Poettering | 3b2d5b0 | 2012-04-24 13:12:29 +0200 | [diff] [blame] | 294 | shared = shared_get(); |
| 295 | if (!shared) |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 296 | return EXIT_FAILURE; |
Lennart Poettering | d9c7a87 | 2010-09-28 21:46:14 +0200 | [diff] [blame] | 297 | |
| 298 | shared->replay = getpid(); |
| 299 | __sync_synchronize(); |
| 300 | |
Lennart Poettering | 2b590e1 | 2011-03-03 23:03:26 +0100 | [diff] [blame] | 301 | if (replay(root) < 0) |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 302 | return EXIT_FAILURE; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 303 | |
Lennart Poettering | 87ce22c | 2012-06-21 23:53:20 +0200 | [diff] [blame] | 304 | return EXIT_SUCCESS; |
Lennart Poettering | 22be093 | 2010-09-23 15:01:41 +0200 | [diff] [blame] | 305 | } |