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-rw-r--r--src/libsystemd/libsystemd-journal-internal/journal-vacuum.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/src/libsystemd/libsystemd-journal-internal/journal-vacuum.c b/src/libsystemd/libsystemd-journal-internal/journal-vacuum.c
new file mode 100644
index 0000000000..3650ab3865
--- /dev/null
+++ b/src/libsystemd/libsystemd-journal-internal/journal-vacuum.c
@@ -0,0 +1,349 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2011 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <systemd/sd-id128.h>
+
+#include "alloc-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "journal-def.h"
+#include "journal-file.h"
+#include "journal-vacuum.h"
+#include "parse-util.h"
+#include "string-util.h"
+#include "util.h"
+#include "xattr-util.h"
+
+struct vacuum_info {
+ uint64_t usage;
+ char *filename;
+
+ uint64_t realtime;
+
+ sd_id128_t seqnum_id;
+ uint64_t seqnum;
+ bool have_seqnum;
+};
+
+static int vacuum_compare(const void *_a, const void *_b) {
+ const struct vacuum_info *a, *b;
+
+ a = _a;
+ b = _b;
+
+ if (a->have_seqnum && b->have_seqnum &&
+ sd_id128_equal(a->seqnum_id, b->seqnum_id)) {
+ if (a->seqnum < b->seqnum)
+ return -1;
+ else if (a->seqnum > b->seqnum)
+ return 1;
+ else
+ return 0;
+ }
+
+ if (a->realtime < b->realtime)
+ return -1;
+ else if (a->realtime > b->realtime)
+ return 1;
+ else if (a->have_seqnum && b->have_seqnum)
+ return memcmp(&a->seqnum_id, &b->seqnum_id, 16);
+ else
+ return strcmp(a->filename, b->filename);
+}
+
+static void patch_realtime(
+ int fd,
+ const char *fn,
+ const struct stat *st,
+ unsigned long long *realtime) {
+
+ usec_t x, crtime = 0;
+
+ /* The timestamp was determined by the file name, but let's
+ * see if the file might actually be older than the file name
+ * suggested... */
+
+ assert(fd >= 0);
+ assert(fn);
+ assert(st);
+ assert(realtime);
+
+ x = timespec_load(&st->st_ctim);
+ if (x > 0 && x != USEC_INFINITY && x < *realtime)
+ *realtime = x;
+
+ x = timespec_load(&st->st_atim);
+ if (x > 0 && x != USEC_INFINITY && x < *realtime)
+ *realtime = x;
+
+ x = timespec_load(&st->st_mtim);
+ if (x > 0 && x != USEC_INFINITY && x < *realtime)
+ *realtime = x;
+
+ /* Let's read the original creation time, if possible. Ideally
+ * we'd just query the creation time the FS might provide, but
+ * unfortunately there's currently no sane API to query
+ * it. Hence let's implement this manually... */
+
+ if (fd_getcrtime_at(fd, fn, &crtime, 0) >= 0) {
+ if (crtime < *realtime)
+ *realtime = crtime;
+ }
+}
+
+static int journal_file_empty(int dir_fd, const char *name) {
+ _cleanup_close_ int fd;
+ struct stat st;
+ le64_t n_entries;
+ ssize_t n;
+
+ fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK|O_NOATIME);
+ if (fd < 0) {
+ /* Maybe failed due to O_NOATIME and lack of privileges? */
+ fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
+ if (fd < 0)
+ return -errno;
+ }
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ /* If an offline file doesn't even have a header we consider it empty */
+ if (st.st_size < (off_t) sizeof(Header))
+ return 1;
+
+ /* If the number of entries is empty, we consider it empty, too */
+ n = pread(fd, &n_entries, sizeof(n_entries), offsetof(Header, n_entries));
+ if (n < 0)
+ return -errno;
+ if (n != sizeof(n_entries))
+ return -EIO;
+
+ return le64toh(n_entries) <= 0;
+}
+
+int journal_directory_vacuum(
+ const char *directory,
+ uint64_t max_use,
+ uint64_t n_max_files,
+ usec_t max_retention_usec,
+ usec_t *oldest_usec,
+ bool verbose) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ struct vacuum_info *list = NULL;
+ unsigned n_list = 0, i, n_active_files = 0;
+ size_t n_allocated = 0;
+ uint64_t sum = 0, freed = 0;
+ usec_t retention_limit = 0;
+ char sbytes[FORMAT_BYTES_MAX];
+ struct dirent *de;
+ int r;
+
+ assert(directory);
+
+ if (max_use <= 0 && max_retention_usec <= 0 && n_max_files <= 0)
+ return 0;
+
+ if (max_retention_usec > 0) {
+ retention_limit = now(CLOCK_REALTIME);
+ if (retention_limit > max_retention_usec)
+ retention_limit -= max_retention_usec;
+ else
+ max_retention_usec = retention_limit = 0;
+ }
+
+ d = opendir(directory);
+ if (!d)
+ return -errno;
+
+ FOREACH_DIRENT_ALL(de, d, r = -errno; goto finish) {
+
+ unsigned long long seqnum = 0, realtime;
+ _cleanup_free_ char *p = NULL;
+ sd_id128_t seqnum_id;
+ bool have_seqnum;
+ uint64_t size;
+ struct stat st;
+ size_t q;
+
+ if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
+ log_debug_errno(errno, "Failed to stat file %s while vacuuming, ignoring: %m", de->d_name);
+ continue;
+ }
+
+ if (!S_ISREG(st.st_mode))
+ continue;
+
+ q = strlen(de->d_name);
+
+ if (endswith(de->d_name, ".journal")) {
+
+ /* Vacuum archived files. Active files are
+ * left around */
+
+ if (q < 1 + 32 + 1 + 16 + 1 + 16 + 8) {
+ n_active_files++;
+ continue;
+ }
+
+ if (de->d_name[q-8-16-1] != '-' ||
+ de->d_name[q-8-16-1-16-1] != '-' ||
+ de->d_name[q-8-16-1-16-1-32-1] != '@') {
+ n_active_files++;
+ continue;
+ }
+
+ p = strdup(de->d_name);
+ if (!p) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ de->d_name[q-8-16-1-16-1] = 0;
+ if (sd_id128_from_string(de->d_name + q-8-16-1-16-1-32, &seqnum_id) < 0) {
+ n_active_files++;
+ continue;
+ }
+
+ if (sscanf(de->d_name + q-8-16-1-16, "%16llx-%16llx.journal", &seqnum, &realtime) != 2) {
+ n_active_files++;
+ continue;
+ }
+
+ have_seqnum = true;
+
+ } else if (endswith(de->d_name, ".journal~")) {
+ unsigned long long tmp;
+
+ /* Vacuum corrupted files */
+
+ if (q < 1 + 16 + 1 + 16 + 8 + 1) {
+ n_active_files ++;
+ continue;
+ }
+
+ if (de->d_name[q-1-8-16-1] != '-' ||
+ de->d_name[q-1-8-16-1-16-1] != '@') {
+ n_active_files ++;
+ continue;
+ }
+
+ p = strdup(de->d_name);
+ if (!p) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (sscanf(de->d_name + q-1-8-16-1-16, "%16llx-%16llx.journal~", &realtime, &tmp) != 2) {
+ n_active_files ++;
+ continue;
+ }
+
+ have_seqnum = false;
+ } else {
+ /* We do not vacuum unknown files! */
+ log_debug("Not vacuuming unknown file %s.", de->d_name);
+ continue;
+ }
+
+ size = 512UL * (uint64_t) st.st_blocks;
+
+ r = journal_file_empty(dirfd(d), p);
+ if (r < 0) {
+ log_debug_errno(r, "Failed check if %s is empty, ignoring: %m", p);
+ continue;
+ }
+ if (r > 0) {
+ /* Always vacuum empty non-online files. */
+
+ if (unlinkat(dirfd(d), p, 0) >= 0) {
+
+ log_full(verbose ? LOG_INFO : LOG_DEBUG,
+ "Deleted empty archived journal %s/%s (%s).", directory, p, format_bytes(sbytes, sizeof(sbytes), size));
+
+ freed += size;
+ } else if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to delete empty archived journal %s/%s: %m", directory, p);
+
+ continue;
+ }
+
+ patch_realtime(dirfd(d), p, &st, &realtime);
+
+ if (!GREEDY_REALLOC(list, n_allocated, n_list + 1)) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ list[n_list].filename = p;
+ list[n_list].usage = size;
+ list[n_list].seqnum = seqnum;
+ list[n_list].realtime = realtime;
+ list[n_list].seqnum_id = seqnum_id;
+ list[n_list].have_seqnum = have_seqnum;
+ n_list ++;
+
+ p = NULL;
+ sum += size;
+ }
+
+ qsort_safe(list, n_list, sizeof(struct vacuum_info), vacuum_compare);
+
+ for (i = 0; i < n_list; i++) {
+ unsigned left;
+
+ left = n_active_files + n_list - i;
+
+ if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) &&
+ (max_use <= 0 || sum <= max_use) &&
+ (n_max_files <= 0 || left <= n_max_files))
+ break;
+
+ if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) {
+ 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));
+ freed += list[i].usage;
+
+ if (list[i].usage < sum)
+ sum -= list[i].usage;
+ else
+ sum = 0;
+
+ } else if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to delete archived journal %s/%s: %m", directory, list[i].filename);
+ }
+
+ if (oldest_usec && i < n_list && (*oldest_usec == 0 || list[i].realtime < *oldest_usec))
+ *oldest_usec = list[i].realtime;
+
+ r = 0;
+
+finish:
+ for (i = 0; i < n_list; i++)
+ free(list[i].filename);
+ free(list);
+
+ log_full(verbose ? LOG_INFO : LOG_DEBUG, "Vacuuming done, freed %s of archived journals on disk.", format_bytes(sbytes, sizeof(sbytes), freed));
+
+ return r;
+}
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