330 lines
11 KiB
C
330 lines
11 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "journal-def.h"
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#include "journal-file.h"
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#include "journal-vacuum.h"
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#include "sd-id128.h"
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#include "util.h"
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struct vacuum_info {
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uint64_t usage;
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char *filename;
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uint64_t realtime;
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sd_id128_t seqnum_id;
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uint64_t seqnum;
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bool have_seqnum;
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};
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static int vacuum_compare(const void *_a, const void *_b) {
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const struct vacuum_info *a, *b;
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a = _a;
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b = _b;
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if (a->have_seqnum && b->have_seqnum &&
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sd_id128_equal(a->seqnum_id, b->seqnum_id)) {
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if (a->seqnum < b->seqnum)
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return -1;
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else if (a->seqnum > b->seqnum)
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return 1;
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else
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return 0;
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}
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if (a->realtime < b->realtime)
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return -1;
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else if (a->realtime > b->realtime)
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return 1;
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else if (a->have_seqnum && b->have_seqnum)
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return memcmp(&a->seqnum_id, &b->seqnum_id, 16);
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else
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return strcmp(a->filename, b->filename);
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}
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static void patch_realtime(
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const char *dir,
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const char *fn,
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const struct stat *st,
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unsigned long long *realtime) {
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_cleanup_free_ const char *path = NULL;
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usec_t x, crtime = 0;
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/* The timestamp was determined by the file name, but let's
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* see if the file might actually be older than the file name
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* suggested... */
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assert(dir);
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assert(fn);
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assert(st);
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assert(realtime);
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x = timespec_load(&st->st_ctim);
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if (x > 0 && x != USEC_INFINITY && x < *realtime)
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*realtime = x;
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x = timespec_load(&st->st_atim);
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if (x > 0 && x != USEC_INFINITY && x < *realtime)
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*realtime = x;
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x = timespec_load(&st->st_mtim);
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if (x > 0 && x != USEC_INFINITY && x < *realtime)
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*realtime = x;
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/* Let's read the original creation time, if possible. Ideally
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* we'd just query the creation time the FS might provide, but
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* unfortunately there's currently no sane API to query
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* it. Hence let's implement this manually... */
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/* Unfortunately there is is not fgetxattrat(), so we need to
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* go via path here. :-( */
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path = strjoin(dir, "/", fn, NULL);
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if (!path)
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return;
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if (path_getcrtime(path, &crtime) >= 0) {
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if (crtime < *realtime)
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*realtime = crtime;
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}
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}
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static int journal_file_empty(int dir_fd, const char *name) {
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_cleanup_close_ int fd;
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struct stat st;
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le64_t n_entries;
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ssize_t n;
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fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
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if (fd < 0)
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return -errno;
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if (fstat(fd, &st) < 0)
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return -errno;
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/* If an offline file doesn't even have a header we consider it empty */
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if (st.st_size < (off_t) sizeof(Header))
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return 1;
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/* If the number of entries is empty, we consider it empty, too */
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n = pread(fd, &n_entries, sizeof(n_entries), offsetof(Header, n_entries));
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if (n < 0)
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return -errno;
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if (n != sizeof(n_entries))
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return -EIO;
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return le64toh(n_entries) <= 0;
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}
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int journal_directory_vacuum(
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const char *directory,
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uint64_t max_use,
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usec_t max_retention_usec,
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usec_t *oldest_usec,
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bool verbose) {
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_cleanup_closedir_ DIR *d = NULL;
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int r = 0;
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struct vacuum_info *list = NULL;
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unsigned n_list = 0, i;
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size_t n_allocated = 0;
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uint64_t sum = 0, freed = 0;
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usec_t retention_limit = 0;
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char sbytes[FORMAT_BYTES_MAX];
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assert(directory);
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if (max_use <= 0 && max_retention_usec <= 0)
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return 0;
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if (max_retention_usec > 0) {
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retention_limit = now(CLOCK_REALTIME);
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if (retention_limit > max_retention_usec)
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retention_limit -= max_retention_usec;
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else
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max_retention_usec = retention_limit = 0;
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}
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d = opendir(directory);
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if (!d)
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return -errno;
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for (;;) {
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struct dirent *de;
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size_t q;
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struct stat st;
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char *p;
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unsigned long long seqnum = 0, realtime;
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sd_id128_t seqnum_id;
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bool have_seqnum;
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errno = 0;
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de = readdir(d);
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if (!de && errno != 0) {
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r = -errno;
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goto finish;
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}
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if (!de)
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break;
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if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
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continue;
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if (!S_ISREG(st.st_mode))
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continue;
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q = strlen(de->d_name);
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if (endswith(de->d_name, ".journal")) {
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/* Vacuum archived files */
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if (q < 1 + 32 + 1 + 16 + 1 + 16 + 8)
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continue;
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if (de->d_name[q-8-16-1] != '-' ||
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de->d_name[q-8-16-1-16-1] != '-' ||
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de->d_name[q-8-16-1-16-1-32-1] != '@')
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continue;
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p = strdup(de->d_name);
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if (!p) {
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r = -ENOMEM;
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goto finish;
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}
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de->d_name[q-8-16-1-16-1] = 0;
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if (sd_id128_from_string(de->d_name + q-8-16-1-16-1-32, &seqnum_id) < 0) {
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free(p);
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continue;
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}
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if (sscanf(de->d_name + q-8-16-1-16, "%16llx-%16llx.journal", &seqnum, &realtime) != 2) {
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free(p);
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continue;
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}
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have_seqnum = true;
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} else if (endswith(de->d_name, ".journal~")) {
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unsigned long long tmp;
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/* Vacuum corrupted files */
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if (q < 1 + 16 + 1 + 16 + 8 + 1)
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continue;
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if (de->d_name[q-1-8-16-1] != '-' ||
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de->d_name[q-1-8-16-1-16-1] != '@')
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continue;
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p = strdup(de->d_name);
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if (!p) {
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r = -ENOMEM;
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goto finish;
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}
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if (sscanf(de->d_name + q-1-8-16-1-16, "%16llx-%16llx.journal~", &realtime, &tmp) != 2) {
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free(p);
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continue;
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}
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have_seqnum = false;
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} else
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/* We do not vacuum active files or unknown files! */
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continue;
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if (journal_file_empty(dirfd(d), p)) {
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/* Always vacuum empty non-online files. */
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uint64_t size = 512UL * (uint64_t) st.st_blocks;
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if (unlinkat(dirfd(d), p, 0) >= 0) {
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log_full(verbose ? LOG_INFO : LOG_DEBUG, "Deleted empty archived journal %s/%s (%s).", directory, p, format_bytes(sbytes, sizeof(sbytes), size));
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freed += size;
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} else if (errno != ENOENT)
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log_warning_errno(errno, "Failed to delete empty archived journal %s/%s: %m", directory, p);
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free(p);
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continue;
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}
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patch_realtime(directory, p, &st, &realtime);
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if (!GREEDY_REALLOC(list, n_allocated, n_list + 1)) {
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free(p);
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r = -ENOMEM;
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goto finish;
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}
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list[n_list].filename = p;
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list[n_list].usage = 512UL * (uint64_t) st.st_blocks;
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list[n_list].seqnum = seqnum;
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list[n_list].realtime = realtime;
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list[n_list].seqnum_id = seqnum_id;
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list[n_list].have_seqnum = have_seqnum;
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sum += list[n_list].usage;
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n_list ++;
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}
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qsort_safe(list, n_list, sizeof(struct vacuum_info), vacuum_compare);
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for (i = 0; i < n_list; i++) {
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if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) &&
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(max_use <= 0 || sum <= max_use))
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break;
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if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) {
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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));
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freed += list[i].usage;
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if (list[i].usage < sum)
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sum -= list[i].usage;
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else
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sum = 0;
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} else if (errno != ENOENT)
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log_warning_errno(errno, "Failed to delete archived journal %s/%s: %m", directory, list[i].filename);
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}
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if (oldest_usec && i < n_list && (*oldest_usec == 0 || list[i].realtime < *oldest_usec))
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*oldest_usec = list[i].realtime;
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finish:
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for (i = 0; i < n_list; i++)
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free(list[i].filename);
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free(list);
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log_full(verbose ? LOG_INFO : LOG_DEBUG, "Vacuuming done, freed %s of archived journals on disk.", format_bytes(sbytes, sizeof(sbytes), freed));
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return r;
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}
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