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0284adc6 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
0284adc6 LP |
22 | #include <fcntl.h> |
23 | #include <sys/stat.h> | |
0284adc6 | 24 | #include <unistd.h> |
fb0951b0 | 25 | |
07630cea LP |
26 | #include "sd-id128.h" |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
a0956174 | 29 | #include "dirent-util.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
0284adc6 LP |
31 | #include "journal-def.h" |
32 | #include "journal-file.h" | |
3ffd4af2 | 33 | #include "journal-vacuum.h" |
6bedfcbb | 34 | #include "parse-util.h" |
07630cea | 35 | #include "string-util.h" |
0284adc6 | 36 | #include "util.h" |
89a5a90c | 37 | #include "xattr-util.h" |
0284adc6 LP |
38 | |
39 | struct vacuum_info { | |
6c142648 | 40 | uint64_t usage; |
0284adc6 LP |
41 | char *filename; |
42 | ||
43 | uint64_t realtime; | |
2e14c544 | 44 | |
0284adc6 LP |
45 | sd_id128_t seqnum_id; |
46 | uint64_t seqnum; | |
0284adc6 LP |
47 | bool have_seqnum; |
48 | }; | |
49 | ||
50 | static int vacuum_compare(const void *_a, const void *_b) { | |
51 | const struct vacuum_info *a, *b; | |
52 | ||
53 | a = _a; | |
54 | b = _b; | |
55 | ||
56 | if (a->have_seqnum && b->have_seqnum && | |
57 | sd_id128_equal(a->seqnum_id, b->seqnum_id)) { | |
58 | if (a->seqnum < b->seqnum) | |
59 | return -1; | |
60 | else if (a->seqnum > b->seqnum) | |
61 | return 1; | |
62 | else | |
63 | return 0; | |
64 | } | |
65 | ||
66 | if (a->realtime < b->realtime) | |
67 | return -1; | |
68 | else if (a->realtime > b->realtime) | |
69 | return 1; | |
70 | else if (a->have_seqnum && b->have_seqnum) | |
71 | return memcmp(&a->seqnum_id, &b->seqnum_id, 16); | |
72 | else | |
73 | return strcmp(a->filename, b->filename); | |
74 | } | |
75 | ||
fb0951b0 | 76 | static void patch_realtime( |
2e14c544 | 77 | int fd, |
fb0951b0 LP |
78 | const char *fn, |
79 | const struct stat *st, | |
80 | unsigned long long *realtime) { | |
81 | ||
a7f7d1bd | 82 | usec_t x, crtime = 0; |
fb0951b0 LP |
83 | |
84 | /* The timestamp was determined by the file name, but let's | |
85 | * see if the file might actually be older than the file name | |
86 | * suggested... */ | |
87 | ||
2e14c544 | 88 | assert(fd >= 0); |
fb0951b0 LP |
89 | assert(fn); |
90 | assert(st); | |
91 | assert(realtime); | |
92 | ||
93 | x = timespec_load(&st->st_ctim); | |
3a43da28 | 94 | if (x > 0 && x != USEC_INFINITY && x < *realtime) |
fb0951b0 LP |
95 | *realtime = x; |
96 | ||
97 | x = timespec_load(&st->st_atim); | |
3a43da28 | 98 | if (x > 0 && x != USEC_INFINITY && x < *realtime) |
fb0951b0 LP |
99 | *realtime = x; |
100 | ||
101 | x = timespec_load(&st->st_mtim); | |
3a43da28 | 102 | if (x > 0 && x != USEC_INFINITY && x < *realtime) |
fb0951b0 LP |
103 | *realtime = x; |
104 | ||
fb0951b0 LP |
105 | /* Let's read the original creation time, if possible. Ideally |
106 | * we'd just query the creation time the FS might provide, but | |
107 | * unfortunately there's currently no sane API to query | |
108 | * it. Hence let's implement this manually... */ | |
109 | ||
2e14c544 | 110 | if (fd_getcrtime_at(fd, fn, &crtime, 0) >= 0) { |
4a4d89b6 | 111 | if (crtime < *realtime) |
fb0951b0 LP |
112 | *realtime = crtime; |
113 | } | |
fb0951b0 LP |
114 | } |
115 | ||
9d647740 | 116 | static int journal_file_empty(int dir_fd, const char *name) { |
48979861 | 117 | _cleanup_close_ int fd; |
332076b4 LP |
118 | struct stat st; |
119 | le64_t n_entries; | |
120 | ssize_t n; | |
9d647740 | 121 | |
7b5195e2 LP |
122 | fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK|O_NOATIME); |
123 | if (fd < 0) { | |
124 | /* Maybe failed due to O_NOATIME and lack of privileges? */ | |
125 | fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
126 | if (fd < 0) | |
127 | return -errno; | |
128 | } | |
9d647740 | 129 | |
332076b4 | 130 | if (fstat(fd, &st) < 0) |
9d647740 ZJS |
131 | return -errno; |
132 | ||
332076b4 LP |
133 | /* If an offline file doesn't even have a header we consider it empty */ |
134 | if (st.st_size < (off_t) sizeof(Header)) | |
135 | return 1; | |
136 | ||
137 | /* If the number of entries is empty, we consider it empty, too */ | |
138 | n = pread(fd, &n_entries, sizeof(n_entries), offsetof(Header, n_entries)); | |
139 | if (n < 0) | |
140 | return -errno; | |
141 | if (n != sizeof(n_entries)) | |
142 | return -EIO; | |
9d647740 | 143 | |
332076b4 | 144 | return le64toh(n_entries) <= 0; |
9d647740 ZJS |
145 | } |
146 | ||
fb0951b0 LP |
147 | int journal_directory_vacuum( |
148 | const char *directory, | |
149 | uint64_t max_use, | |
8580d1f7 | 150 | uint64_t n_max_files, |
fb0951b0 | 151 | usec_t max_retention_usec, |
dbd2a83f LP |
152 | usec_t *oldest_usec, |
153 | bool verbose) { | |
fb0951b0 | 154 | |
30cb029b | 155 | _cleanup_closedir_ DIR *d = NULL; |
0284adc6 | 156 | struct vacuum_info *list = NULL; |
8580d1f7 | 157 | unsigned n_list = 0, i, n_active_files = 0; |
30cb029b | 158 | size_t n_allocated = 0; |
289f910e | 159 | uint64_t sum = 0, freed = 0; |
fb0951b0 | 160 | usec_t retention_limit = 0; |
dbd2a83f | 161 | char sbytes[FORMAT_BYTES_MAX]; |
8580d1f7 LP |
162 | struct dirent *de; |
163 | int r; | |
0284adc6 LP |
164 | |
165 | assert(directory); | |
166 | ||
8580d1f7 | 167 | if (max_use <= 0 && max_retention_usec <= 0 && n_max_files <= 0) |
0284adc6 LP |
168 | return 0; |
169 | ||
fb0951b0 LP |
170 | if (max_retention_usec > 0) { |
171 | retention_limit = now(CLOCK_REALTIME); | |
172 | if (retention_limit > max_retention_usec) | |
173 | retention_limit -= max_retention_usec; | |
174 | else | |
175 | max_retention_usec = retention_limit = 0; | |
176 | } | |
177 | ||
0284adc6 LP |
178 | d = opendir(directory); |
179 | if (!d) | |
180 | return -errno; | |
181 | ||
8580d1f7 LP |
182 | FOREACH_DIRENT_ALL(de, d, r = -errno; goto finish) { |
183 | ||
0284adc6 | 184 | unsigned long long seqnum = 0, realtime; |
8580d1f7 | 185 | _cleanup_free_ char *p = NULL; |
0284adc6 LP |
186 | sd_id128_t seqnum_id; |
187 | bool have_seqnum; | |
8580d1f7 LP |
188 | uint64_t size; |
189 | struct stat st; | |
190 | size_t q; | |
0284adc6 | 191 | |
8580d1f7 LP |
192 | if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { |
193 | log_debug_errno(errno, "Failed to stat file %s while vacuuming, ignoring: %m", de->d_name); | |
0284adc6 | 194 | continue; |
8580d1f7 | 195 | } |
0284adc6 LP |
196 | |
197 | if (!S_ISREG(st.st_mode)) | |
198 | continue; | |
199 | ||
200 | q = strlen(de->d_name); | |
201 | ||
202 | if (endswith(de->d_name, ".journal")) { | |
203 | ||
8580d1f7 LP |
204 | /* Vacuum archived files. Active files are |
205 | * left around */ | |
0284adc6 | 206 | |
8580d1f7 LP |
207 | if (q < 1 + 32 + 1 + 16 + 1 + 16 + 8) { |
208 | n_active_files++; | |
0284adc6 | 209 | continue; |
8580d1f7 | 210 | } |
0284adc6 LP |
211 | |
212 | if (de->d_name[q-8-16-1] != '-' || | |
213 | de->d_name[q-8-16-1-16-1] != '-' || | |
8580d1f7 LP |
214 | de->d_name[q-8-16-1-16-1-32-1] != '@') { |
215 | n_active_files++; | |
0284adc6 | 216 | continue; |
8580d1f7 | 217 | } |
0284adc6 LP |
218 | |
219 | p = strdup(de->d_name); | |
220 | if (!p) { | |
221 | r = -ENOMEM; | |
222 | goto finish; | |
223 | } | |
224 | ||
225 | de->d_name[q-8-16-1-16-1] = 0; | |
226 | if (sd_id128_from_string(de->d_name + q-8-16-1-16-1-32, &seqnum_id) < 0) { | |
8580d1f7 | 227 | n_active_files++; |
0284adc6 LP |
228 | continue; |
229 | } | |
230 | ||
231 | if (sscanf(de->d_name + q-8-16-1-16, "%16llx-%16llx.journal", &seqnum, &realtime) != 2) { | |
8580d1f7 | 232 | n_active_files++; |
0284adc6 LP |
233 | continue; |
234 | } | |
235 | ||
236 | have_seqnum = true; | |
237 | ||
238 | } else if (endswith(de->d_name, ".journal~")) { | |
239 | unsigned long long tmp; | |
240 | ||
241 | /* Vacuum corrupted files */ | |
242 | ||
8580d1f7 LP |
243 | if (q < 1 + 16 + 1 + 16 + 8 + 1) { |
244 | n_active_files ++; | |
0284adc6 | 245 | continue; |
8580d1f7 | 246 | } |
0284adc6 LP |
247 | |
248 | if (de->d_name[q-1-8-16-1] != '-' || | |
8580d1f7 LP |
249 | de->d_name[q-1-8-16-1-16-1] != '@') { |
250 | n_active_files ++; | |
0284adc6 | 251 | continue; |
8580d1f7 | 252 | } |
0284adc6 LP |
253 | |
254 | p = strdup(de->d_name); | |
255 | if (!p) { | |
256 | r = -ENOMEM; | |
257 | goto finish; | |
258 | } | |
259 | ||
260 | if (sscanf(de->d_name + q-1-8-16-1-16, "%16llx-%16llx.journal~", &realtime, &tmp) != 2) { | |
8580d1f7 | 261 | n_active_files ++; |
0284adc6 LP |
262 | continue; |
263 | } | |
264 | ||
265 | have_seqnum = false; | |
8580d1f7 LP |
266 | } else { |
267 | /* We do not vacuum unknown files! */ | |
268 | log_debug("Not vacuuming unknown file %s.", de->d_name); | |
0284adc6 | 269 | continue; |
8580d1f7 | 270 | } |
0284adc6 | 271 | |
8580d1f7 | 272 | size = 512UL * (uint64_t) st.st_blocks; |
9d647740 | 273 | |
8580d1f7 LP |
274 | r = journal_file_empty(dirfd(d), p); |
275 | if (r < 0) { | |
276 | log_debug_errno(r, "Failed check if %s is empty, ignoring: %m", p); | |
277 | continue; | |
278 | } | |
279 | if (r > 0) { | |
280 | /* Always vacuum empty non-online files. */ | |
289f910e ZJS |
281 | |
282 | if (unlinkat(dirfd(d), p, 0) >= 0) { | |
8580d1f7 LP |
283 | |
284 | log_full(verbose ? LOG_INFO : LOG_DEBUG, | |
285 | "Deleted empty archived journal %s/%s (%s).", directory, p, format_bytes(sbytes, sizeof(sbytes), size)); | |
286 | ||
289f910e ZJS |
287 | freed += size; |
288 | } else if (errno != ENOENT) | |
56f64d95 | 289 | log_warning_errno(errno, "Failed to delete empty archived journal %s/%s: %m", directory, p); |
289f910e | 290 | |
9d647740 ZJS |
291 | continue; |
292 | } | |
293 | ||
8580d1f7 | 294 | patch_realtime(dirfd(d), p, &st, &realtime); |
fb0951b0 | 295 | |
26d8ff04 | 296 | if (!GREEDY_REALLOC(list, n_allocated, n_list + 1)) { |
26d8ff04 LP |
297 | r = -ENOMEM; |
298 | goto finish; | |
299 | } | |
0284adc6 LP |
300 | |
301 | list[n_list].filename = p; | |
8580d1f7 | 302 | list[n_list].usage = size; |
0284adc6 LP |
303 | list[n_list].seqnum = seqnum; |
304 | list[n_list].realtime = realtime; | |
305 | list[n_list].seqnum_id = seqnum_id; | |
306 | list[n_list].have_seqnum = have_seqnum; | |
0284adc6 | 307 | n_list ++; |
8580d1f7 LP |
308 | |
309 | p = NULL; | |
310 | sum += size; | |
0284adc6 LP |
311 | } |
312 | ||
7ff7394d | 313 | qsort_safe(list, n_list, sizeof(struct vacuum_info), vacuum_compare); |
0284adc6 | 314 | |
fb0951b0 | 315 | for (i = 0; i < n_list; i++) { |
8580d1f7 LP |
316 | unsigned left; |
317 | ||
318 | left = n_active_files + n_list - i; | |
319 | ||
fb0951b0 | 320 | if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) && |
8580d1f7 LP |
321 | (max_use <= 0 || sum <= max_use) && |
322 | (n_max_files <= 0 || left <= n_max_files)) | |
0284adc6 LP |
323 | break; |
324 | ||
325 | if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) { | |
dbd2a83f | 326 | log_full(verbose ? LOG_INFO : LOG_DEBUG, "Deleted archived journal %s/%s (%s).", directory, list[i].filename, format_bytes(sbytes, sizeof(sbytes), list[i].usage)); |
289f910e | 327 | freed += list[i].usage; |
4fa25d62 | 328 | |
6c142648 | 329 | if (list[i].usage < sum) |
4fa25d62 LP |
330 | sum -= list[i].usage; |
331 | else | |
332 | sum = 0; | |
333 | ||
0284adc6 | 334 | } else if (errno != ENOENT) |
56f64d95 | 335 | log_warning_errno(errno, "Failed to delete archived journal %s/%s: %m", directory, list[i].filename); |
0284adc6 LP |
336 | } |
337 | ||
fb0951b0 LP |
338 | if (oldest_usec && i < n_list && (*oldest_usec == 0 || list[i].realtime < *oldest_usec)) |
339 | *oldest_usec = list[i].realtime; | |
340 | ||
8580d1f7 LP |
341 | r = 0; |
342 | ||
0284adc6 LP |
343 | finish: |
344 | for (i = 0; i < n_list; i++) | |
345 | free(list[i].filename); | |
0284adc6 LP |
346 | free(list); |
347 | ||
dbd2a83f | 348 | log_full(verbose ? LOG_INFO : LOG_DEBUG, "Vacuuming done, freed %s of archived journals on disk.", format_bytes(sbytes, sizeof(sbytes), freed)); |
289f910e | 349 | |
0284adc6 LP |
350 | return r; |
351 | } |