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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 | ||
22 | #include <sys/types.h> | |
23 | #include <fcntl.h> | |
24 | #include <sys/stat.h> | |
25 | #include <sys/statvfs.h> | |
26 | #include <unistd.h> | |
d2edfae0 | 27 | #include <sys/xattr.h> |
fb0951b0 | 28 | |
0284adc6 LP |
29 | #include "journal-def.h" |
30 | #include "journal-file.h" | |
31 | #include "journal-vacuum.h" | |
32 | #include "sd-id128.h" | |
33 | #include "util.h" | |
34 | ||
35 | struct vacuum_info { | |
6c142648 | 36 | uint64_t usage; |
0284adc6 LP |
37 | char *filename; |
38 | ||
39 | uint64_t realtime; | |
40 | sd_id128_t seqnum_id; | |
41 | uint64_t seqnum; | |
42 | ||
43 | bool have_seqnum; | |
44 | }; | |
45 | ||
46 | static int vacuum_compare(const void *_a, const void *_b) { | |
47 | const struct vacuum_info *a, *b; | |
48 | ||
49 | a = _a; | |
50 | b = _b; | |
51 | ||
52 | if (a->have_seqnum && b->have_seqnum && | |
53 | sd_id128_equal(a->seqnum_id, b->seqnum_id)) { | |
54 | if (a->seqnum < b->seqnum) | |
55 | return -1; | |
56 | else if (a->seqnum > b->seqnum) | |
57 | return 1; | |
58 | else | |
59 | return 0; | |
60 | } | |
61 | ||
62 | if (a->realtime < b->realtime) | |
63 | return -1; | |
64 | else if (a->realtime > b->realtime) | |
65 | return 1; | |
66 | else if (a->have_seqnum && b->have_seqnum) | |
67 | return memcmp(&a->seqnum_id, &b->seqnum_id, 16); | |
68 | else | |
69 | return strcmp(a->filename, b->filename); | |
70 | } | |
71 | ||
fb0951b0 LP |
72 | static void patch_realtime( |
73 | const char *dir, | |
74 | const char *fn, | |
75 | const struct stat *st, | |
76 | unsigned long long *realtime) { | |
77 | ||
78 | usec_t x; | |
fb0951b0 LP |
79 | uint64_t crtime; |
80 | _cleanup_free_ const char *path = NULL; | |
fb0951b0 LP |
81 | |
82 | /* The timestamp was determined by the file name, but let's | |
83 | * see if the file might actually be older than the file name | |
84 | * suggested... */ | |
85 | ||
86 | assert(dir); | |
87 | assert(fn); | |
88 | assert(st); | |
89 | assert(realtime); | |
90 | ||
91 | x = timespec_load(&st->st_ctim); | |
92 | if (x > 0 && x != (usec_t) -1 && x < *realtime) | |
93 | *realtime = x; | |
94 | ||
95 | x = timespec_load(&st->st_atim); | |
96 | if (x > 0 && x != (usec_t) -1 && x < *realtime) | |
97 | *realtime = x; | |
98 | ||
99 | x = timespec_load(&st->st_mtim); | |
100 | if (x > 0 && x != (usec_t) -1 && x < *realtime) | |
101 | *realtime = x; | |
102 | ||
fb0951b0 LP |
103 | /* Let's read the original creation time, if possible. Ideally |
104 | * we'd just query the creation time the FS might provide, but | |
105 | * unfortunately there's currently no sane API to query | |
106 | * it. Hence let's implement this manually... */ | |
107 | ||
108 | /* Unfortunately there is is not fgetxattrat(), so we need to | |
109 | * go via path here. :-( */ | |
110 | ||
111 | path = strjoin(dir, "/", fn, NULL); | |
112 | if (!path) | |
113 | return; | |
114 | ||
115 | if (getxattr(path, "user.crtime_usec", &crtime, sizeof(crtime)) == sizeof(crtime)) { | |
116 | crtime = le64toh(crtime); | |
117 | ||
118 | if (crtime > 0 && crtime != (uint64_t) -1 && crtime < *realtime) | |
119 | *realtime = crtime; | |
120 | } | |
fb0951b0 LP |
121 | } |
122 | ||
9d647740 | 123 | static int journal_file_empty(int dir_fd, const char *name) { |
48979861 | 124 | int r; |
9d647740 | 125 | le64_t n_entries; |
48979861 | 126 | _cleanup_close_ int fd; |
9d647740 ZJS |
127 | |
128 | fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
129 | if (fd < 0) | |
130 | return -errno; | |
131 | ||
132 | if (lseek(fd, offsetof(Header, n_entries), SEEK_SET) < 0) | |
133 | return -errno; | |
134 | ||
135 | r = read(fd, &n_entries, sizeof(n_entries)); | |
136 | if (r != sizeof(n_entries)) | |
137 | return r == 0 ? -EINVAL : -errno; | |
138 | ||
139 | return le64toh(n_entries) == 0; | |
140 | } | |
141 | ||
fb0951b0 LP |
142 | int journal_directory_vacuum( |
143 | const char *directory, | |
144 | uint64_t max_use, | |
fb0951b0 LP |
145 | usec_t max_retention_usec, |
146 | usec_t *oldest_usec) { | |
147 | ||
30cb029b | 148 | _cleanup_closedir_ DIR *d = NULL; |
0284adc6 LP |
149 | int r = 0; |
150 | struct vacuum_info *list = NULL; | |
30cb029b ZJS |
151 | unsigned n_list = 0, i; |
152 | size_t n_allocated = 0; | |
289f910e | 153 | uint64_t sum = 0, freed = 0; |
fb0951b0 | 154 | usec_t retention_limit = 0; |
0284adc6 LP |
155 | |
156 | assert(directory); | |
157 | ||
348ced90 | 158 | if (max_use <= 0 && max_retention_usec <= 0) |
0284adc6 LP |
159 | return 0; |
160 | ||
fb0951b0 LP |
161 | if (max_retention_usec > 0) { |
162 | retention_limit = now(CLOCK_REALTIME); | |
163 | if (retention_limit > max_retention_usec) | |
164 | retention_limit -= max_retention_usec; | |
165 | else | |
166 | max_retention_usec = retention_limit = 0; | |
167 | } | |
168 | ||
0284adc6 LP |
169 | d = opendir(directory); |
170 | if (!d) | |
171 | return -errno; | |
172 | ||
173 | for (;;) { | |
7d5e9c0f | 174 | struct dirent *de; |
0284adc6 LP |
175 | size_t q; |
176 | struct stat st; | |
177 | char *p; | |
178 | unsigned long long seqnum = 0, realtime; | |
179 | sd_id128_t seqnum_id; | |
180 | bool have_seqnum; | |
181 | ||
78a5d04d FW |
182 | errno = 0; |
183 | de = readdir(d); | |
184 | if (!de && errno != 0) { | |
185 | r = -errno; | |
0284adc6 LP |
186 | goto finish; |
187 | } | |
188 | ||
189 | if (!de) | |
190 | break; | |
191 | ||
192 | if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) | |
193 | continue; | |
194 | ||
195 | if (!S_ISREG(st.st_mode)) | |
196 | continue; | |
197 | ||
198 | q = strlen(de->d_name); | |
199 | ||
200 | if (endswith(de->d_name, ".journal")) { | |
201 | ||
202 | /* Vacuum archived files */ | |
203 | ||
204 | if (q < 1 + 32 + 1 + 16 + 1 + 16 + 8) | |
205 | continue; | |
206 | ||
207 | if (de->d_name[q-8-16-1] != '-' || | |
208 | de->d_name[q-8-16-1-16-1] != '-' || | |
209 | de->d_name[q-8-16-1-16-1-32-1] != '@') | |
210 | continue; | |
211 | ||
212 | p = strdup(de->d_name); | |
213 | if (!p) { | |
214 | r = -ENOMEM; | |
215 | goto finish; | |
216 | } | |
217 | ||
218 | de->d_name[q-8-16-1-16-1] = 0; | |
219 | if (sd_id128_from_string(de->d_name + q-8-16-1-16-1-32, &seqnum_id) < 0) { | |
220 | free(p); | |
221 | continue; | |
222 | } | |
223 | ||
224 | if (sscanf(de->d_name + q-8-16-1-16, "%16llx-%16llx.journal", &seqnum, &realtime) != 2) { | |
225 | free(p); | |
226 | continue; | |
227 | } | |
228 | ||
229 | have_seqnum = true; | |
230 | ||
231 | } else if (endswith(de->d_name, ".journal~")) { | |
232 | unsigned long long tmp; | |
233 | ||
234 | /* Vacuum corrupted files */ | |
235 | ||
236 | if (q < 1 + 16 + 1 + 16 + 8 + 1) | |
237 | continue; | |
238 | ||
239 | if (de->d_name[q-1-8-16-1] != '-' || | |
240 | de->d_name[q-1-8-16-1-16-1] != '@') | |
241 | continue; | |
242 | ||
243 | p = strdup(de->d_name); | |
244 | if (!p) { | |
245 | r = -ENOMEM; | |
246 | goto finish; | |
247 | } | |
248 | ||
249 | if (sscanf(de->d_name + q-1-8-16-1-16, "%16llx-%16llx.journal~", &realtime, &tmp) != 2) { | |
250 | free(p); | |
251 | continue; | |
252 | } | |
253 | ||
254 | have_seqnum = false; | |
255 | } else | |
4fa25d62 | 256 | /* We do not vacuum active files or unknown files! */ |
0284adc6 LP |
257 | continue; |
258 | ||
629bfc5a | 259 | if (journal_file_empty(dirfd(d), p)) { |
9d647740 ZJS |
260 | /* Always vacuum empty non-online files. */ |
261 | ||
289f910e ZJS |
262 | uint64_t size = 512UL * (uint64_t) st.st_blocks; |
263 | ||
264 | if (unlinkat(dirfd(d), p, 0) >= 0) { | |
265 | log_info("Deleted empty journal %s/%s (%"PRIu64" bytes).", | |
266 | directory, p, size); | |
267 | freed += size; | |
268 | } else if (errno != ENOENT) | |
629bfc5a | 269 | log_warning("Failed to delete %s/%s: %m", directory, p); |
289f910e | 270 | |
2ee0591d LP |
271 | free(p); |
272 | ||
9d647740 ZJS |
273 | continue; |
274 | } | |
275 | ||
629bfc5a | 276 | patch_realtime(directory, p, &st, &realtime); |
fb0951b0 | 277 | |
30cb029b | 278 | GREEDY_REALLOC(list, n_allocated, n_list + 1); |
0284adc6 LP |
279 | |
280 | list[n_list].filename = p; | |
281 | list[n_list].usage = 512UL * (uint64_t) st.st_blocks; | |
282 | list[n_list].seqnum = seqnum; | |
283 | list[n_list].realtime = realtime; | |
284 | list[n_list].seqnum_id = seqnum_id; | |
285 | list[n_list].have_seqnum = have_seqnum; | |
286 | ||
287 | sum += list[n_list].usage; | |
288 | ||
289 | n_list ++; | |
290 | } | |
291 | ||
7ff7394d | 292 | qsort_safe(list, n_list, sizeof(struct vacuum_info), vacuum_compare); |
0284adc6 | 293 | |
fb0951b0 | 294 | for (i = 0; i < n_list; i++) { |
0284adc6 LP |
295 | struct statvfs ss; |
296 | ||
297 | if (fstatvfs(dirfd(d), &ss) < 0) { | |
298 | r = -errno; | |
299 | goto finish; | |
300 | } | |
301 | ||
fb0951b0 | 302 | if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) && |
348ced90 | 303 | (max_use <= 0 || sum <= max_use)) |
0284adc6 LP |
304 | break; |
305 | ||
306 | if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) { | |
289f910e ZJS |
307 | log_debug("Deleted archived journal %s/%s (%"PRIu64" bytes).", |
308 | directory, list[i].filename, list[i].usage); | |
309 | freed += list[i].usage; | |
4fa25d62 | 310 | |
6c142648 | 311 | if (list[i].usage < sum) |
4fa25d62 LP |
312 | sum -= list[i].usage; |
313 | else | |
314 | sum = 0; | |
315 | ||
0284adc6 LP |
316 | } else if (errno != ENOENT) |
317 | log_warning("Failed to delete %s/%s: %m", directory, list[i].filename); | |
318 | } | |
319 | ||
fb0951b0 LP |
320 | if (oldest_usec && i < n_list && (*oldest_usec == 0 || list[i].realtime < *oldest_usec)) |
321 | *oldest_usec = list[i].realtime; | |
322 | ||
0284adc6 LP |
323 | finish: |
324 | for (i = 0; i < n_list; i++) | |
325 | free(list[i].filename); | |
0284adc6 LP |
326 | free(list); |
327 | ||
3bb621e1 | 328 | log_debug("Vacuuming done, freed %"PRIu64" bytes", freed); |
289f910e | 329 | |
0284adc6 LP |
330 | return r; |
331 | } |