blob: 494a54d33b16d761ccdf93573c0d1d858cd84f94 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-id128.h"
#include "alloc-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "journal-def.h"
#include "journal-file.h"
#include "journal-vacuum.h"
#include "sort-util.h"
#include "string-util.h"
#include "time-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 struct vacuum_info *a, const struct vacuum_info *b) {
int r;
if (a->have_seqnum && b->have_seqnum &&
sd_id128_equal(a->seqnum_id, b->seqnum_id))
return CMP(a->seqnum, b->seqnum);
r = CMP(a->realtime, b->realtime);
if (r != 0)
return r;
if (a->have_seqnum && b->have_seqnum)
return memcmp(&a->seqnum_id, &b->seqnum_id, 16);
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 = -1;
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) {
uint64_t sum = 0, freed = 0, n_active_files = 0;
size_t n_list = 0, i;
_cleanup_closedir_ DIR *d = NULL;
struct vacuum_info *list = NULL;
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 = usec_sub_unsigned(now(CLOCK_REALTIME), max_retention_usec);
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;
/* seqnum_id won't be initialised before use below, so set to 0 */
seqnum_id = SD_ID128_NULL;
/* 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. */
r = unlinkat_deallocate(dirfd(d), p, 0);
if (r >= 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 (r != -ENOENT)
log_warning_errno(r, "Failed to delete empty archived journal %s/%s: %m", directory, p);
continue;
}
patch_realtime(dirfd(d), p, &st, &realtime);
if (!GREEDY_REALLOC(list, n_list + 1)) {
r = -ENOMEM;
goto finish;
}
list[n_list++] = (struct vacuum_info) {
.filename = TAKE_PTR(p),
.usage = size,
.seqnum = seqnum,
.realtime = realtime,
.seqnum_id = seqnum_id,
.have_seqnum = have_seqnum,
};
sum += size;
}
typesafe_qsort(list, n_list, vacuum_compare);
for (i = 0; i < n_list; i++) {
uint64_t 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;
r = unlinkat_deallocate(dirfd(d), list[i].filename, 0);
if (r >= 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 (r != -ENOENT)
log_warning_errno(r, "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 from %s.", format_bytes(sbytes, sizeof(sbytes), freed), directory);
return r;
}