diff options
Diffstat (limited to 'src/journal/journal-vacuum.c')
| -rw-r--r-- | src/journal/journal-vacuum.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/src/journal/journal-vacuum.c b/src/journal/journal-vacuum.c new file mode 100644 index 0000000000..731f6c770f --- /dev/null +++ b/src/journal/journal-vacuum.c @@ -0,0 +1,318 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + 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 <sys/types.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/statvfs.h> +#include <unistd.h> + +#ifdef HAVE_XATTR +#include <attr/xattr.h> +#endif + +#include "journal-def.h" +#include "journal-file.h" +#include "journal-vacuum.h" +#include "sd-id128.h" +#include "util.h" + +struct vacuum_info { + off_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( + const char *dir, + const char *fn, + const struct stat *st, + unsigned long long *realtime) { + + usec_t x; + +#ifdef HAVE_XATTR + uint64_t crtime; + _cleanup_free_ const char *path = NULL; +#endif + + /* 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(dir); + assert(fn); + assert(st); + assert(realtime); + + x = timespec_load(&st->st_ctim); + if (x > 0 && x != (usec_t) -1 && x < *realtime) + *realtime = x; + + x = timespec_load(&st->st_atim); + if (x > 0 && x != (usec_t) -1 && x < *realtime) + *realtime = x; + + x = timespec_load(&st->st_mtim); + if (x > 0 && x != (usec_t) -1 && x < *realtime) + *realtime = x; + +#ifdef HAVE_XATTR + /* 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... */ + + /* Unfortunately there is is not fgetxattrat(), so we need to + * go via path here. :-( */ + + path = strjoin(dir, "/", fn, NULL); + if (!path) + return; + + if (getxattr(path, "user.crtime_usec", &crtime, sizeof(crtime)) == sizeof(crtime)) { + crtime = le64toh(crtime); + + if (crtime > 0 && crtime != (uint64_t) -1 && crtime < *realtime) + *realtime = crtime; + } +#endif +} + +int journal_directory_vacuum( + const char *directory, + uint64_t max_use, + uint64_t min_free, + usec_t max_retention_usec, + usec_t *oldest_usec) { + + DIR *d; + int r = 0; + struct vacuum_info *list = NULL; + unsigned n_list = 0, n_allocated = 0, i; + uint64_t sum = 0; + usec_t retention_limit = 0; + + assert(directory); + + if (max_use <= 0 && min_free <= 0 && max_retention_usec <= 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; + + for (;;) { + int k; + struct dirent *de; + union dirent_storage buf; + size_t q; + struct stat st; + char *p; + unsigned long long seqnum = 0, realtime; + sd_id128_t seqnum_id; + bool have_seqnum; + + k = readdir_r(d, &buf.de, &de); + if (k != 0) { + r = -k; + goto finish; + } + + if (!de) + break; + + if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) + continue; + + if (!S_ISREG(st.st_mode)) + continue; + + q = strlen(de->d_name); + + if (endswith(de->d_name, ".journal")) { + + /* Vacuum archived files */ + + if (q < 1 + 32 + 1 + 16 + 1 + 16 + 8) + 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] != '@') + 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) { + free(p); + continue; + } + + if (sscanf(de->d_name + q-8-16-1-16, "%16llx-%16llx.journal", &seqnum, &realtime) != 2) { + free(p); + 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) + continue; + + if (de->d_name[q-1-8-16-1] != '-' || + de->d_name[q-1-8-16-1-16-1] != '@') + 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) { + free(p); + continue; + } + + have_seqnum = false; + } else + /* We do not vacuum active files or unknown files! */ + continue; + + patch_realtime(directory, de->d_name, &st, &realtime); + + if (n_list >= n_allocated) { + struct vacuum_info *j; + + n_allocated = MAX(n_allocated * 2U, 8U); + j = realloc(list, n_allocated * sizeof(struct vacuum_info)); + if (!j) { + free(p); + r = -ENOMEM; + goto finish; + } + + list = j; + } + + list[n_list].filename = p; + list[n_list].usage = 512UL * (uint64_t) st.st_blocks; + list[n_list].seqnum = seqnum; + list[n_list].realtime = realtime; + list[n_list].seqnum_id = seqnum_id; + list[n_list].have_seqnum = have_seqnum; + + sum += list[n_list].usage; + + n_list ++; + } + + if (n_list > 0) + qsort(list, n_list, sizeof(struct vacuum_info), vacuum_compare); + + for (i = 0; i < n_list; i++) { + struct statvfs ss; + + if (fstatvfs(dirfd(d), &ss) < 0) { + r = -errno; + goto finish; + } + + if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) && + (max_use <= 0 || sum <= max_use) && + (min_free <= 0 || (uint64_t) ss.f_bavail * (uint64_t) ss.f_bsize >= min_free)) + break; + + if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) { + log_debug("Deleted archived journal %s/%s.", directory, list[i].filename); + + if ((uint64_t) list[i].usage > sum) + sum -= list[i].usage; + else + sum = 0; + + } else if (errno != ENOENT) + log_warning("Failed to delete %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; + +finish: + for (i = 0; i < n_list; i++) + free(list[i].filename); + + free(list); + + if (d) + closedir(d); + + return r; +} |