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-rw-r--r--src/journal/journal-file.c4153
1 files changed, 0 insertions, 4153 deletions
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
deleted file mode 100644
index cfa4657f84..0000000000
--- a/src/journal/journal-file.c
+++ /dev/null
@@ -1,4153 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <linux/fs.h>
-#include <pthread.h>
-#include <stddef.h>
-#include <sys/mman.h>
-#include <sys/statvfs.h>
-#include <sys/uio.h>
-#include <unistd.h>
-
-#include "sd-event.h"
-
-#include "alloc-util.h"
-#include "btrfs-util.h"
-#include "chattr-util.h"
-#include "compress.h"
-#include "env-util.h"
-#include "fd-util.h"
-#include "format-util.h"
-#include "fs-util.h"
-#include "journal-authenticate.h"
-#include "journal-def.h"
-#include "journal-file.h"
-#include "lookup3.h"
-#include "memory-util.h"
-#include "path-util.h"
-#include "random-util.h"
-#include "set.h"
-#include "sort-util.h"
-#include "stat-util.h"
-#include "string-util.h"
-#include "strv.h"
-#include "xattr-util.h"
-
-#define DEFAULT_DATA_HASH_TABLE_SIZE (2047ULL*sizeof(HashItem))
-#define DEFAULT_FIELD_HASH_TABLE_SIZE (333ULL*sizeof(HashItem))
-
-#define DEFAULT_COMPRESS_THRESHOLD (512ULL)
-#define MIN_COMPRESS_THRESHOLD (8ULL)
-
-/* This is the minimum journal file size */
-#define JOURNAL_FILE_SIZE_MIN (512 * 1024ULL) /* 512 KiB */
-
-/* These are the lower and upper bounds if we deduce the max_use value
- * from the file system size */
-#define MAX_USE_LOWER (1 * 1024 * 1024ULL) /* 1 MiB */
-#define MAX_USE_UPPER (4 * 1024 * 1024 * 1024ULL) /* 4 GiB */
-
-/* Those are the lower and upper bounds for the minimal use limit,
- * i.e. how much we'll use even if keep_free suggests otherwise. */
-#define MIN_USE_LOW (1 * 1024 * 1024ULL) /* 1 MiB */
-#define MIN_USE_HIGH (16 * 1024 * 1024ULL) /* 16 MiB */
-
-/* This is the upper bound if we deduce max_size from max_use */
-#define MAX_SIZE_UPPER (128 * 1024 * 1024ULL) /* 128 MiB */
-
-/* This is the upper bound if we deduce the keep_free value from the
- * file system size */
-#define KEEP_FREE_UPPER (4 * 1024 * 1024 * 1024ULL) /* 4 GiB */
-
-/* This is the keep_free value when we can't determine the system
- * size */
-#define DEFAULT_KEEP_FREE (1024 * 1024ULL) /* 1 MB */
-
-/* This is the default maximum number of journal files to keep around. */
-#define DEFAULT_N_MAX_FILES 100
-
-/* n_data was the first entry we added after the initial file format design */
-#define HEADER_SIZE_MIN ALIGN64(offsetof(Header, n_data))
-
-/* How many entries to keep in the entry array chain cache at max */
-#define CHAIN_CACHE_MAX 20
-
-/* How much to increase the journal file size at once each time we allocate something new. */
-#define FILE_SIZE_INCREASE (8 * 1024 * 1024ULL) /* 8MB */
-
-/* Reread fstat() of the file for detecting deletions at least this often */
-#define LAST_STAT_REFRESH_USEC (5*USEC_PER_SEC)
-
-/* The mmap context to use for the header we pick as one above the last defined typed */
-#define CONTEXT_HEADER _OBJECT_TYPE_MAX
-
-/* Longest hash chain to rotate after */
-#define HASH_CHAIN_DEPTH_MAX 100
-
-#ifdef __clang__
-# pragma GCC diagnostic ignored "-Waddress-of-packed-member"
-#endif
-
-/* This may be called from a separate thread to prevent blocking the caller for the duration of fsync().
- * As a result we use atomic operations on f->offline_state for inter-thread communications with
- * journal_file_set_offline() and journal_file_set_online(). */
-static void journal_file_set_offline_internal(JournalFile *f) {
- assert(f);
- assert(f->fd >= 0);
- assert(f->header);
-
- for (;;) {
- switch (f->offline_state) {
- case OFFLINE_CANCEL:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_CANCEL, OFFLINE_DONE))
- continue;
- return;
-
- case OFFLINE_AGAIN_FROM_SYNCING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_AGAIN_FROM_SYNCING, OFFLINE_SYNCING))
- continue;
- break;
-
- case OFFLINE_AGAIN_FROM_OFFLINING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_AGAIN_FROM_OFFLINING, OFFLINE_SYNCING))
- continue;
- break;
-
- case OFFLINE_SYNCING:
- (void) fsync(f->fd);
-
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_SYNCING, OFFLINE_OFFLINING))
- continue;
-
- f->header->state = f->archive ? STATE_ARCHIVED : STATE_OFFLINE;
- (void) fsync(f->fd);
- break;
-
- case OFFLINE_OFFLINING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_OFFLINING, OFFLINE_DONE))
- continue;
- _fallthrough_;
- case OFFLINE_DONE:
- return;
-
- case OFFLINE_JOINED:
- log_debug("OFFLINE_JOINED unexpected offline state for journal_file_set_offline_internal()");
- return;
- }
- }
-}
-
-static void * journal_file_set_offline_thread(void *arg) {
- JournalFile *f = arg;
-
- (void) pthread_setname_np(pthread_self(), "journal-offline");
-
- journal_file_set_offline_internal(f);
-
- return NULL;
-}
-
-static int journal_file_set_offline_thread_join(JournalFile *f) {
- int r;
-
- assert(f);
-
- if (f->offline_state == OFFLINE_JOINED)
- return 0;
-
- r = pthread_join(f->offline_thread, NULL);
- if (r)
- return -r;
-
- f->offline_state = OFFLINE_JOINED;
-
- if (mmap_cache_got_sigbus(f->mmap, f->cache_fd))
- return -EIO;
-
- return 0;
-}
-
-/* Trigger a restart if the offline thread is mid-flight in a restartable state. */
-static bool journal_file_set_offline_try_restart(JournalFile *f) {
- for (;;) {
- switch (f->offline_state) {
- case OFFLINE_AGAIN_FROM_SYNCING:
- case OFFLINE_AGAIN_FROM_OFFLINING:
- return true;
-
- case OFFLINE_CANCEL:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_CANCEL, OFFLINE_AGAIN_FROM_SYNCING))
- continue;
- return true;
-
- case OFFLINE_SYNCING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_SYNCING, OFFLINE_AGAIN_FROM_SYNCING))
- continue;
- return true;
-
- case OFFLINE_OFFLINING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_OFFLINING, OFFLINE_AGAIN_FROM_OFFLINING))
- continue;
- return true;
-
- default:
- return false;
- }
- }
-}
-
-/* Sets a journal offline.
- *
- * If wait is false then an offline is dispatched in a separate thread for a
- * subsequent journal_file_set_offline() or journal_file_set_online() of the
- * same journal to synchronize with.
- *
- * If wait is true, then either an existing offline thread will be restarted
- * and joined, or if none exists the offline is simply performed in this
- * context without involving another thread.
- */
-int journal_file_set_offline(JournalFile *f, bool wait) {
- bool restarted;
- int r;
-
- assert(f);
-
- if (!f->writable)
- return -EPERM;
-
- if (f->fd < 0 || !f->header)
- return -EINVAL;
-
- /* An offlining journal is implicitly online and may modify f->header->state,
- * we must also join any potentially lingering offline thread when not online. */
- if (!journal_file_is_offlining(f) && f->header->state != STATE_ONLINE)
- return journal_file_set_offline_thread_join(f);
-
- /* Restart an in-flight offline thread and wait if needed, or join a lingering done one. */
- restarted = journal_file_set_offline_try_restart(f);
- if ((restarted && wait) || !restarted) {
- r = journal_file_set_offline_thread_join(f);
- if (r < 0)
- return r;
- }
-
- if (restarted)
- return 0;
-
- /* Initiate a new offline. */
- f->offline_state = OFFLINE_SYNCING;
-
- if (wait) /* Without using a thread if waiting. */
- journal_file_set_offline_internal(f);
- else {
- sigset_t ss, saved_ss;
- int k;
-
- assert_se(sigfillset(&ss) >= 0);
- /* Don't block SIGBUS since the offlining thread accesses a memory mapped file.
- * Asynchronous SIGBUS signals can safely be handled by either thread. */
- assert_se(sigdelset(&ss, SIGBUS) >= 0);
-
- r = pthread_sigmask(SIG_BLOCK, &ss, &saved_ss);
- if (r > 0)
- return -r;
-
- r = pthread_create(&f->offline_thread, NULL, journal_file_set_offline_thread, f);
-
- k = pthread_sigmask(SIG_SETMASK, &saved_ss, NULL);
- if (r > 0) {
- f->offline_state = OFFLINE_JOINED;
- return -r;
- }
- if (k > 0)
- return -k;
- }
-
- return 0;
-}
-
-static int journal_file_set_online(JournalFile *f) {
- bool wait = true;
-
- assert(f);
-
- if (!f->writable)
- return -EPERM;
-
- if (f->fd < 0 || !f->header)
- return -EINVAL;
-
- while (wait) {
- switch (f->offline_state) {
- case OFFLINE_JOINED:
- /* No offline thread, no need to wait. */
- wait = false;
- break;
-
- case OFFLINE_SYNCING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_SYNCING, OFFLINE_CANCEL))
- continue;
- /* Canceled syncing prior to offlining, no need to wait. */
- wait = false;
- break;
-
- case OFFLINE_AGAIN_FROM_SYNCING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_AGAIN_FROM_SYNCING, OFFLINE_CANCEL))
- continue;
- /* Canceled restart from syncing, no need to wait. */
- wait = false;
- break;
-
- case OFFLINE_AGAIN_FROM_OFFLINING:
- if (!__sync_bool_compare_and_swap(&f->offline_state, OFFLINE_AGAIN_FROM_OFFLINING, OFFLINE_CANCEL))
- continue;
- /* Canceled restart from offlining, must wait for offlining to complete however. */
- _fallthrough_;
- default: {
- int r;
-
- r = journal_file_set_offline_thread_join(f);
- if (r < 0)
- return r;
-
- wait = false;
- break;
- }
- }
- }
-
- if (mmap_cache_got_sigbus(f->mmap, f->cache_fd))
- return -EIO;
-
- switch (f->header->state) {
- case STATE_ONLINE:
- return 0;
-
- case STATE_OFFLINE:
- f->header->state = STATE_ONLINE;
- (void) fsync(f->fd);
- return 0;
-
- default:
- return -EINVAL;
- }
-}
-
-bool journal_file_is_offlining(JournalFile *f) {
- assert(f);
-
- __sync_synchronize();
-
- if (IN_SET(f->offline_state, OFFLINE_DONE, OFFLINE_JOINED))
- return false;
-
- return true;
-}
-
-JournalFile* journal_file_close(JournalFile *f) {
- if (!f)
- return NULL;
-
-#if HAVE_GCRYPT
- /* Write the final tag */
- if (f->seal && f->writable) {
- int r;
-
- r = journal_file_append_tag(f);
- if (r < 0)
- log_error_errno(r, "Failed to append tag when closing journal: %m");
- }
-#endif
-
- if (f->post_change_timer) {
- if (sd_event_source_get_enabled(f->post_change_timer, NULL) > 0)
- journal_file_post_change(f);
-
- sd_event_source_disable_unref(f->post_change_timer);
- }
-
- journal_file_set_offline(f, true);
-
- if (f->mmap && f->cache_fd)
- mmap_cache_free_fd(f->mmap, f->cache_fd);
-
- if (f->fd >= 0 && f->defrag_on_close) {
-
- /* Be friendly to btrfs: turn COW back on again now,
- * and defragment the file. We won't write to the file
- * ever again, hence remove all fragmentation, and
- * reenable all the good bits COW usually provides
- * (such as data checksumming). */
-
- (void) chattr_fd(f->fd, 0, FS_NOCOW_FL, NULL);
- (void) btrfs_defrag_fd(f->fd);
- }
-
- if (f->close_fd)
- safe_close(f->fd);
- free(f->path);
-
- mmap_cache_unref(f->mmap);
-
- ordered_hashmap_free_free(f->chain_cache);
-
-#if HAVE_COMPRESSION
- free(f->compress_buffer);
-#endif
-
-#if HAVE_GCRYPT
- if (f->fss_file)
- munmap(f->fss_file, PAGE_ALIGN(f->fss_file_size));
- else
- free(f->fsprg_state);
-
- free(f->fsprg_seed);
-
- if (f->hmac)
- gcry_md_close(f->hmac);
-#endif
-
- return mfree(f);
-}
-
-static int journal_file_init_header(JournalFile *f, JournalFile *template) {
- Header h = {};
- ssize_t k;
- int r;
-
- assert(f);
-
- memcpy(h.signature, HEADER_SIGNATURE, 8);
- h.header_size = htole64(ALIGN64(sizeof(h)));
-
- h.incompatible_flags |= htole32(
- f->compress_xz * HEADER_INCOMPATIBLE_COMPRESSED_XZ |
- f->compress_lz4 * HEADER_INCOMPATIBLE_COMPRESSED_LZ4 |
- f->compress_zstd * HEADER_INCOMPATIBLE_COMPRESSED_ZSTD |
- f->keyed_hash * HEADER_INCOMPATIBLE_KEYED_HASH);
-
- h.compatible_flags = htole32(
- f->seal * HEADER_COMPATIBLE_SEALED);
-
- r = sd_id128_randomize(&h.file_id);
- if (r < 0)
- return r;
-
- if (template) {
- h.seqnum_id = template->header->seqnum_id;
- h.tail_entry_seqnum = template->header->tail_entry_seqnum;
- } else
- h.seqnum_id = h.file_id;
-
- k = pwrite(f->fd, &h, sizeof(h), 0);
- if (k < 0)
- return -errno;
-
- if (k != sizeof(h))
- return -EIO;
-
- return 0;
-}
-
-static int journal_file_refresh_header(JournalFile *f) {
- int r;
-
- assert(f);
- assert(f->header);
-
- r = sd_id128_get_machine(&f->header->machine_id);
- if (IN_SET(r, -ENOENT, -ENOMEDIUM))
- /* We don't have a machine-id, let's continue without */
- zero(f->header->machine_id);
- else if (r < 0)
- return r;
-
- r = sd_id128_get_boot(&f->header->boot_id);
- if (r < 0)
- return r;
-
- r = journal_file_set_online(f);
-
- /* Sync the online state to disk */
- (void) fsync(f->fd);
-
- /* We likely just created a new file, also sync the directory this file is located in. */
- (void) fsync_directory_of_file(f->fd);
-
- return r;
-}
-
-static bool warn_wrong_flags(const JournalFile *f, bool compatible) {
- const uint32_t any = compatible ? HEADER_COMPATIBLE_ANY : HEADER_INCOMPATIBLE_ANY,
- supported = compatible ? HEADER_COMPATIBLE_SUPPORTED : HEADER_INCOMPATIBLE_SUPPORTED;
- const char *type = compatible ? "compatible" : "incompatible";
- uint32_t flags;
-
- flags = le32toh(compatible ? f->header->compatible_flags : f->header->incompatible_flags);
-
- if (flags & ~supported) {
- if (flags & ~any)
- log_debug("Journal file %s has unknown %s flags 0x%"PRIx32,
- f->path, type, flags & ~any);
- flags = (flags & any) & ~supported;
- if (flags) {
- const char* strv[5];
- unsigned n = 0;
- _cleanup_free_ char *t = NULL;
-
- if (compatible) {
- if (flags & HEADER_COMPATIBLE_SEALED)
- strv[n++] = "sealed";
- } else {
- if (flags & HEADER_INCOMPATIBLE_COMPRESSED_XZ)
- strv[n++] = "xz-compressed";
- if (flags & HEADER_INCOMPATIBLE_COMPRESSED_LZ4)
- strv[n++] = "lz4-compressed";
- if (flags & HEADER_INCOMPATIBLE_COMPRESSED_ZSTD)
- strv[n++] = "zstd-compressed";
- if (flags & HEADER_INCOMPATIBLE_KEYED_HASH)
- strv[n++] = "keyed-hash";
- }
- strv[n] = NULL;
- assert(n < ELEMENTSOF(strv));
-
- t = strv_join((char**) strv, ", ");
- log_debug("Journal file %s uses %s %s %s disabled at compilation time.",
- f->path, type, n > 1 ? "flags" : "flag", strnull(t));
- }
- return true;
- }
-
- return false;
-}
-
-static int journal_file_verify_header(JournalFile *f) {
- uint64_t arena_size, header_size;
-
- assert(f);
- assert(f->header);
-
- if (memcmp(f->header->signature, HEADER_SIGNATURE, 8))
- return -EBADMSG;
-
- /* In both read and write mode we refuse to open files with incompatible
- * flags we don't know. */
- if (warn_wrong_flags(f, false))
- return -EPROTONOSUPPORT;
-
- /* When open for writing we refuse to open files with compatible flags, too. */
- if (f->writable && warn_wrong_flags(f, true))
- return -EPROTONOSUPPORT;
-
- if (f->header->state >= _STATE_MAX)
- return -EBADMSG;
-
- header_size = le64toh(READ_NOW(f->header->header_size));
-
- /* The first addition was n_data, so check that we are at least this large */
- if (header_size < HEADER_SIZE_MIN)
- return -EBADMSG;
-
- if (JOURNAL_HEADER_SEALED(f->header) && !JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays))
- return -EBADMSG;
-
- arena_size = le64toh(READ_NOW(f->header->arena_size));
-
- if (UINT64_MAX - header_size < arena_size || header_size + arena_size > (uint64_t) f->last_stat.st_size)
- return -ENODATA;
-
- if (le64toh(f->header->tail_object_offset) > header_size + arena_size)
- return -ENODATA;
-
- if (!VALID64(le64toh(f->header->data_hash_table_offset)) ||
- !VALID64(le64toh(f->header->field_hash_table_offset)) ||
- !VALID64(le64toh(f->header->tail_object_offset)) ||
- !VALID64(le64toh(f->header->entry_array_offset)))
- return -ENODATA;
-
- if (f->writable) {
- sd_id128_t machine_id;
- uint8_t state;
- int r;
-
- r = sd_id128_get_machine(&machine_id);
- if (r < 0)
- return r;
-
- if (!sd_id128_equal(machine_id, f->header->machine_id))
- return -EHOSTDOWN;
-
- state = f->header->state;
-
- if (state == STATE_ARCHIVED)
- return -ESHUTDOWN; /* Already archived */
- else if (state == STATE_ONLINE)
- return log_debug_errno(SYNTHETIC_ERRNO(EBUSY),
- "Journal file %s is already online. Assuming unclean closing.",
- f->path);
- else if (state != STATE_OFFLINE)
- return log_debug_errno(SYNTHETIC_ERRNO(EBUSY),
- "Journal file %s has unknown state %i.",
- f->path, state);
-
- if (f->header->field_hash_table_size == 0 || f->header->data_hash_table_size == 0)
- return -EBADMSG;
-
- /* Don't permit appending to files from the future. Because otherwise the realtime timestamps wouldn't
- * be strictly ordered in the entries in the file anymore, and we can't have that since it breaks
- * bisection. */
- if (le64toh(f->header->tail_entry_realtime) > now(CLOCK_REALTIME))
- return log_debug_errno(SYNTHETIC_ERRNO(ETXTBSY),
- "Journal file %s is from the future, refusing to append new data to it that'd be older.",
- f->path);
- }
-
- f->compress_xz = JOURNAL_HEADER_COMPRESSED_XZ(f->header);
- f->compress_lz4 = JOURNAL_HEADER_COMPRESSED_LZ4(f->header);
- f->compress_zstd = JOURNAL_HEADER_COMPRESSED_ZSTD(f->header);
-
- f->seal = JOURNAL_HEADER_SEALED(f->header);
-
- f->keyed_hash = JOURNAL_HEADER_KEYED_HASH(f->header);
-
- return 0;
-}
-
-int journal_file_fstat(JournalFile *f) {
- int r;
-
- assert(f);
- assert(f->fd >= 0);
-
- if (fstat(f->fd, &f->last_stat) < 0)
- return -errno;
-
- f->last_stat_usec = now(CLOCK_MONOTONIC);
-
- /* Refuse dealing with files that aren't regular */
- r = stat_verify_regular(&f->last_stat);
- if (r < 0)
- return r;
-
- /* Refuse appending to files that are already deleted */
- if (f->last_stat.st_nlink <= 0)
- return -EIDRM;
-
- return 0;
-}
-
-static int journal_file_allocate(JournalFile *f, uint64_t offset, uint64_t size) {
- uint64_t old_size, new_size, old_header_size, old_arena_size;
- int r;
-
- assert(f);
- assert(f->header);
-
- /* We assume that this file is not sparse, and we know that for sure, since we always call
- * posix_fallocate() ourselves */
-
- if (size > PAGE_ALIGN_DOWN(UINT64_MAX) - offset)
- return -EINVAL;
-
- if (mmap_cache_got_sigbus(f->mmap, f->cache_fd))
- return -EIO;
-
- old_header_size = le64toh(READ_NOW(f->header->header_size));
- old_arena_size = le64toh(READ_NOW(f->header->arena_size));
- if (old_arena_size > PAGE_ALIGN_DOWN(UINT64_MAX) - old_header_size)
- return -EBADMSG;
-
- old_size = old_header_size + old_arena_size;
-
- new_size = MAX(PAGE_ALIGN(offset + size), old_header_size);
-
- if (new_size <= old_size) {
-
- /* We already pre-allocated enough space, but before
- * we write to it, let's check with fstat() if the
- * file got deleted, in order make sure we don't throw
- * away the data immediately. Don't check fstat() for
- * all writes though, but only once ever 10s. */
-
- if (f->last_stat_usec + LAST_STAT_REFRESH_USEC > now(CLOCK_MONOTONIC))
- return 0;
-
- return journal_file_fstat(f);
- }
-
- /* Allocate more space. */
-
- if (f->metrics.max_size > 0 && new_size > f->metrics.max_size)
- return -E2BIG;
-
- if (new_size > f->metrics.min_size && f->metrics.keep_free > 0) {
- struct statvfs svfs;
-
- if (fstatvfs(f->fd, &svfs) >= 0) {
- uint64_t available;
-
- available = LESS_BY((uint64_t) svfs.f_bfree * (uint64_t) svfs.f_bsize, f->metrics.keep_free);
-
- if (new_size - old_size > available)
- return -E2BIG;
- }
- }
-
- /* Increase by larger blocks at once */
- new_size = DIV_ROUND_UP(new_size, FILE_SIZE_INCREASE) * FILE_SIZE_INCREASE;
- if (f->metrics.max_size > 0 && new_size > f->metrics.max_size)
- new_size = f->metrics.max_size;
-
- /* Note that the glibc fallocate() fallback is very
- inefficient, hence we try to minimize the allocation area
- as we can. */
- r = posix_fallocate(f->fd, old_size, new_size - old_size);
- if (r != 0)
- return -r;
-
- f->header->arena_size = htole64(new_size - old_header_size);
-
- return journal_file_fstat(f);
-}
-
-static unsigned type_to_context(ObjectType type) {
- /* One context for each type, plus one catch-all for the rest */
- assert_cc(_OBJECT_TYPE_MAX <= MMAP_CACHE_MAX_CONTEXTS);
- assert_cc(CONTEXT_HEADER < MMAP_CACHE_MAX_CONTEXTS);
- return type > OBJECT_UNUSED && type < _OBJECT_TYPE_MAX ? type : 0;
-}
-
-static int journal_file_move_to(
- JournalFile *f,
- ObjectType type,
- bool keep_always,
- uint64_t offset,
- uint64_t size,
- void **ret) {
-
- int r;
-
- assert(f);
- assert(ret);
-
- if (size <= 0)
- return -EINVAL;
-
- if (size > UINT64_MAX - offset)
- return -EBADMSG;
-
- /* Avoid SIGBUS on invalid accesses */
- if (offset + size > (uint64_t) f->last_stat.st_size) {
- /* Hmm, out of range? Let's refresh the fstat() data
- * first, before we trust that check. */
-
- r = journal_file_fstat(f);
- if (r < 0)
- return r;
-
- if (offset + size > (uint64_t) f->last_stat.st_size)
- return -EADDRNOTAVAIL;
- }
-
- return mmap_cache_get(f->mmap, f->cache_fd, type_to_context(type), keep_always, offset, size, &f->last_stat, ret);
-}
-
-static uint64_t minimum_header_size(Object *o) {
-
- static const uint64_t table[] = {
- [OBJECT_DATA] = sizeof(DataObject),
- [OBJECT_FIELD] = sizeof(FieldObject),
- [OBJECT_ENTRY] = sizeof(EntryObject),
- [OBJECT_DATA_HASH_TABLE] = sizeof(HashTableObject),
- [OBJECT_FIELD_HASH_TABLE] = sizeof(HashTableObject),
- [OBJECT_ENTRY_ARRAY] = sizeof(EntryArrayObject),
- [OBJECT_TAG] = sizeof(TagObject),
- };
-
- if (o->object.type >= ELEMENTSOF(table) || table[o->object.type] <= 0)
- return sizeof(ObjectHeader);
-
- return table[o->object.type];
-}
-
-/* Lightweight object checks. We want this to be fast, so that we won't
- * slowdown every journal_file_move_to_object() call too much. */
-static int journal_file_check_object(JournalFile *f, uint64_t offset, Object *o) {
- assert(f);
- assert(o);
-
- switch (o->object.type) {
-
- case OBJECT_DATA:
- if ((le64toh(o->data.entry_offset) == 0) ^ (le64toh(o->data.n_entries) == 0))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Bad n_entries: %" PRIu64 ": %" PRIu64,
- le64toh(o->data.n_entries),
- offset);
-
- if (le64toh(o->object.size) <= offsetof(DataObject, payload))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Bad object size (<= %zu): %" PRIu64 ": %" PRIu64,
- offsetof(DataObject, payload),
- le64toh(o->object.size),
- offset);
-
- if (!VALID64(le64toh(o->data.next_hash_offset)) ||
- !VALID64(le64toh(o->data.next_field_offset)) ||
- !VALID64(le64toh(o->data.entry_offset)) ||
- !VALID64(le64toh(o->data.entry_array_offset)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid offset, next_hash_offset=" OFSfmt ", next_field_offset=" OFSfmt ", entry_offset=" OFSfmt ", entry_array_offset=" OFSfmt ": %" PRIu64,
- le64toh(o->data.next_hash_offset),
- le64toh(o->data.next_field_offset),
- le64toh(o->data.entry_offset),
- le64toh(o->data.entry_array_offset),
- offset);
-
- break;
-
- case OBJECT_FIELD:
- if (le64toh(o->object.size) <= offsetof(FieldObject, payload))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Bad field size (<= %zu): %" PRIu64 ": %" PRIu64,
- offsetof(FieldObject, payload),
- le64toh(o->object.size),
- offset);
-
- if (!VALID64(le64toh(o->field.next_hash_offset)) ||
- !VALID64(le64toh(o->field.head_data_offset)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid offset, next_hash_offset=" OFSfmt ", head_data_offset=" OFSfmt ": %" PRIu64,
- le64toh(o->field.next_hash_offset),
- le64toh(o->field.head_data_offset),
- offset);
- break;
-
- case OBJECT_ENTRY: {
- uint64_t sz;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(EntryObject, items) ||
- (sz - offsetof(EntryObject, items)) % sizeof(EntryItem) != 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Bad entry size (<= %zu): %" PRIu64 ": %" PRIu64,
- offsetof(EntryObject, items),
- sz,
- offset);
-
- if ((sz - offsetof(EntryObject, items)) / sizeof(EntryItem) <= 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid number items in entry: %" PRIu64 ": %" PRIu64,
- (sz - offsetof(EntryObject, items)) / sizeof(EntryItem),
- offset);
-
- if (le64toh(o->entry.seqnum) <= 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid entry seqnum: %" PRIx64 ": %" PRIu64,
- le64toh(o->entry.seqnum),
- offset);
-
- if (!VALID_REALTIME(le64toh(o->entry.realtime)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid entry realtime timestamp: %" PRIu64 ": %" PRIu64,
- le64toh(o->entry.realtime),
- offset);
-
- if (!VALID_MONOTONIC(le64toh(o->entry.monotonic)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid entry monotonic timestamp: %" PRIu64 ": %" PRIu64,
- le64toh(o->entry.monotonic),
- offset);
-
- break;
- }
-
- case OBJECT_DATA_HASH_TABLE:
- case OBJECT_FIELD_HASH_TABLE: {
- uint64_t sz;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(HashTableObject, items) ||
- (sz - offsetof(HashTableObject, items)) % sizeof(HashItem) != 0 ||
- (sz - offsetof(HashTableObject, items)) / sizeof(HashItem) <= 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid %s hash table size: %" PRIu64 ": %" PRIu64,
- o->object.type == OBJECT_DATA_HASH_TABLE ? "data" : "field",
- sz,
- offset);
-
- break;
- }
-
- case OBJECT_ENTRY_ARRAY: {
- uint64_t sz;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(EntryArrayObject, items) ||
- (sz - offsetof(EntryArrayObject, items)) % sizeof(le64_t) != 0 ||
- (sz - offsetof(EntryArrayObject, items)) / sizeof(le64_t) <= 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid object entry array size: %" PRIu64 ": %" PRIu64,
- sz,
- offset);
-
- if (!VALID64(le64toh(o->entry_array.next_entry_array_offset)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid object entry array next_entry_array_offset: " OFSfmt ": %" PRIu64,
- le64toh(o->entry_array.next_entry_array_offset),
- offset);
-
- break;
- }
-
- case OBJECT_TAG:
- if (le64toh(o->object.size) != sizeof(TagObject))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid object tag size: %" PRIu64 ": %" PRIu64,
- le64toh(o->object.size),
- offset);
-
- if (!VALID_EPOCH(le64toh(o->tag.epoch)))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid object tag epoch: %" PRIu64 ": %" PRIu64,
- le64toh(o->tag.epoch), offset);
-
- break;
- }
-
- return 0;
-}
-
-int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset, Object **ret) {
- int r;
- void *t;
- Object *o;
- uint64_t s;
-
- assert(f);
- assert(ret);
-
- /* Objects may only be located at multiple of 64 bit */
- if (!VALID64(offset))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to object at non-64bit boundary: %" PRIu64,
- offset);
-
- /* Object may not be located in the file header */
- if (offset < le64toh(f->header->header_size))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to object located in file header: %" PRIu64,
- offset);
-
- r = journal_file_move_to(f, type, false, offset, sizeof(ObjectHeader), &t);
- if (r < 0)
- return r;
-
- o = (Object*) t;
- s = le64toh(READ_NOW(o->object.size));
-
- if (s == 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to uninitialized object: %" PRIu64,
- offset);
- if (s < sizeof(ObjectHeader))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to overly short object: %" PRIu64,
- offset);
-
- if (o->object.type <= OBJECT_UNUSED)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to object with invalid type: %" PRIu64,
- offset);
-
- if (s < minimum_header_size(o))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to truncated object: %" PRIu64,
- offset);
-
- if (type > OBJECT_UNUSED && o->object.type != type)
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Attempt to move to object of unexpected type: %" PRIu64,
- offset);
-
- r = journal_file_move_to(f, type, false, offset, s, &t);
- if (r < 0)
- return r;
-
- o = (Object*) t;
-
- r = journal_file_check_object(f, offset, o);
- if (r < 0)
- return r;
-
- *ret = o;
- return 0;
-}
-
-static uint64_t journal_file_entry_seqnum(JournalFile *f, uint64_t *seqnum) {
- uint64_t r;
-
- assert(f);
- assert(f->header);
-
- r = le64toh(f->header->tail_entry_seqnum) + 1;
-
- if (seqnum) {
- /* If an external seqnum counter was passed, we update
- * both the local and the external one, and set it to
- * the maximum of both */
-
- if (*seqnum + 1 > r)
- r = *seqnum + 1;
-
- *seqnum = r;
- }
-
- f->header->tail_entry_seqnum = htole64(r);
-
- if (f->header->head_entry_seqnum == 0)
- f->header->head_entry_seqnum = htole64(r);
-
- return r;
-}
-
-int journal_file_append_object(
- JournalFile *f,
- ObjectType type,
- uint64_t size,
- Object **ret,
- uint64_t *ret_offset) {
-
- int r;
- uint64_t p;
- Object *tail, *o;
- void *t;
-
- assert(f);
- assert(f->header);
- assert(type > OBJECT_UNUSED && type < _OBJECT_TYPE_MAX);
- assert(size >= sizeof(ObjectHeader));
-
- r = journal_file_set_online(f);
- if (r < 0)
- return r;
-
- p = le64toh(f->header->tail_object_offset);
- if (p == 0)
- p = le64toh(f->header->header_size);
- else {
- uint64_t sz;
-
- r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &tail);
- if (r < 0)
- return r;
-
- sz = le64toh(READ_NOW(tail->object.size));
- if (sz > UINT64_MAX - sizeof(uint64_t) + 1)
- return -EBADMSG;
-
- sz = ALIGN64(sz);
- if (p > UINT64_MAX - sz)
- return -EBADMSG;
-
- p += sz;
- }
-
- r = journal_file_allocate(f, p, size);
- if (r < 0)
- return r;
-
- r = journal_file_move_to(f, type, false, p, size, &t);
- if (r < 0)
- return r;
-
- o = (Object*) t;
- o->object = (ObjectHeader) {
- .type = type,
- .size = htole64(size),
- };
-
- f->header->tail_object_offset = htole64(p);
- f->header->n_objects = htole64(le64toh(f->header->n_objects) + 1);
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 0;
-}
-
-static int journal_file_setup_data_hash_table(JournalFile *f) {
- uint64_t s, p;
- Object *o;
- int r;
-
- assert(f);
- assert(f->header);
-
- /* We estimate that we need 1 hash table entry per 768 bytes
- of journal file and we want to make sure we never get
- beyond 75% fill level. Calculate the hash table size for
- the maximum file size based on these metrics. */
-
- s = (f->metrics.max_size * 4 / 768 / 3) * sizeof(HashItem);
- if (s < DEFAULT_DATA_HASH_TABLE_SIZE)
- s = DEFAULT_DATA_HASH_TABLE_SIZE;
-
- log_debug("Reserving %"PRIu64" entries in data hash table.", s / sizeof(HashItem));
-
- r = journal_file_append_object(f,
- OBJECT_DATA_HASH_TABLE,
- offsetof(Object, hash_table.items) + s,
- &o, &p);
- if (r < 0)
- return r;
-
- memzero(o->hash_table.items, s);
-
- f->header->data_hash_table_offset = htole64(p + offsetof(Object, hash_table.items));
- f->header->data_hash_table_size = htole64(s);
-
- return 0;
-}
-
-static int journal_file_setup_field_hash_table(JournalFile *f) {
- uint64_t s, p;
- Object *o;
- int r;
-
- assert(f);
- assert(f->header);
-
- /* We use a fixed size hash table for the fields as this
- * number should grow very slowly only */
-
- s = DEFAULT_FIELD_HASH_TABLE_SIZE;
- log_debug("Reserving %"PRIu64" entries in field hash table.", s / sizeof(HashItem));
-
- r = journal_file_append_object(f,
- OBJECT_FIELD_HASH_TABLE,
- offsetof(Object, hash_table.items) + s,
- &o, &p);
- if (r < 0)
- return r;
-
- memzero(o->hash_table.items, s);
-
- f->header->field_hash_table_offset = htole64(p + offsetof(Object, hash_table.items));
- f->header->field_hash_table_size = htole64(s);
-
- return 0;
-}
-
-int journal_file_map_data_hash_table(JournalFile *f) {
- uint64_t s, p;
- void *t;
- int r;
-
- assert(f);
- assert(f->header);
-
- if (f->data_hash_table)
- return 0;
-
- p = le64toh(f->header->data_hash_table_offset);
- s = le64toh(f->header->data_hash_table_size);
-
- r = journal_file_move_to(f,
- OBJECT_DATA_HASH_TABLE,
- true,
- p, s,
- &t);
- if (r < 0)
- return r;
-
- f->data_hash_table = t;
- return 0;
-}
-
-int journal_file_map_field_hash_table(JournalFile *f) {
- uint64_t s, p;
- void *t;
- int r;
-
- assert(f);
- assert(f->header);
-
- if (f->field_hash_table)
- return 0;
-
- p = le64toh(f->header->field_hash_table_offset);
- s = le64toh(f->header->field_hash_table_size);
-
- r = journal_file_move_to(f,
- OBJECT_FIELD_HASH_TABLE,
- true,
- p, s,
- &t);
- if (r < 0)
- return r;
-
- f->field_hash_table = t;
- return 0;
-}
-
-static int journal_file_link_field(
- JournalFile *f,
- Object *o,
- uint64_t offset,
- uint64_t hash) {
-
- uint64_t p, h, m;
- int r;
-
- assert(f);
- assert(f->header);
- assert(f->field_hash_table);
- assert(o);
- assert(offset > 0);
-
- if (o->object.type != OBJECT_FIELD)
- return -EINVAL;
-
- m = le64toh(READ_NOW(f->header->field_hash_table_size)) / sizeof(HashItem);
- if (m <= 0)
- return -EBADMSG;
-
- /* This might alter the window we are looking at */
- o->field.next_hash_offset = o->field.head_data_offset = 0;
-
- h = hash % m;
- p = le64toh(f->field_hash_table[h].tail_hash_offset);
- if (p == 0)
- f->field_hash_table[h].head_hash_offset = htole64(offset);
- else {
- r = journal_file_move_to_object(f, OBJECT_FIELD, p, &o);
- if (r < 0)
- return r;
-
- o->field.next_hash_offset = htole64(offset);
- }
-
- f->field_hash_table[h].tail_hash_offset = htole64(offset);
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_fields))
- f->header->n_fields = htole64(le64toh(f->header->n_fields) + 1);
-
- return 0;
-}
-
-static int journal_file_link_data(
- JournalFile *f,
- Object *o,
- uint64_t offset,
- uint64_t hash) {
-
- uint64_t p, h, m;
- int r;
-
- assert(f);
- assert(f->header);
- assert(f->data_hash_table);
- assert(o);
- assert(offset > 0);
-
- if (o->object.type != OBJECT_DATA)
- return -EINVAL;
-
- m = le64toh(READ_NOW(f->header->data_hash_table_size)) / sizeof(HashItem);
- if (m <= 0)
- return -EBADMSG;
-
- /* This might alter the window we are looking at */
- o->data.next_hash_offset = o->data.next_field_offset = 0;
- o->data.entry_offset = o->data.entry_array_offset = 0;
- o->data.n_entries = 0;
-
- h = hash % m;
- p = le64toh(f->data_hash_table[h].tail_hash_offset);
- if (p == 0)
- /* Only entry in the hash table is easy */
- f->data_hash_table[h].head_hash_offset = htole64(offset);
- else {
- /* Move back to the previous data object, to patch in
- * pointer */
-
- r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
- if (r < 0)
- return r;
-
- o->data.next_hash_offset = htole64(offset);
- }
-
- f->data_hash_table[h].tail_hash_offset = htole64(offset);
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_data))
- f->header->n_data = htole64(le64toh(f->header->n_data) + 1);
-
- return 0;
-}
-
-static int next_hash_offset(
- JournalFile *f,
- uint64_t *p,
- le64_t *next_hash_offset,
- uint64_t *depth,
- le64_t *header_max_depth) {
-
- uint64_t nextp;
-
- nextp = le64toh(READ_NOW(*next_hash_offset));
- if (nextp > 0) {
- if (nextp <= *p) /* Refuse going in loops */
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Detected hash item loop in %s, refusing.", f->path);
-
- (*depth)++;
-
- /* If the depth of this hash chain is larger than all others we have seen so far, record it */
- if (header_max_depth && f->writable)
- *header_max_depth = htole64(MAX(*depth, le64toh(*header_max_depth)));
- }
-
- *p = nextp;
- return 0;
-}
-
-int journal_file_find_field_object_with_hash(
- JournalFile *f,
- const void *field, uint64_t size, uint64_t hash,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t p, osize, h, m, depth = 0;
- int r;
-
- assert(f);
- assert(f->header);
- assert(field && size > 0);
-
- /* If the field hash table is empty, we can't find anything */
- if (le64toh(f->header->field_hash_table_size) <= 0)
- return 0;
-
- /* Map the field hash table, if it isn't mapped yet. */
- r = journal_file_map_field_hash_table(f);
- if (r < 0)
- return r;
-
- osize = offsetof(Object, field.payload) + size;
-
- m = le64toh(READ_NOW(f->header->field_hash_table_size)) / sizeof(HashItem);
- if (m <= 0)
- return -EBADMSG;
-
- h = hash % m;
- p = le64toh(f->field_hash_table[h].head_hash_offset);
- while (p > 0) {
- Object *o;
-
- r = journal_file_move_to_object(f, OBJECT_FIELD, p, &o);
- if (r < 0)
- return r;
-
- if (le64toh(o->field.hash) == hash &&
- le64toh(o->object.size) == osize &&
- memcmp(o->field.payload, field, size) == 0) {
-
- if (ret)
- *ret = o;
- if (ret_offset)
- *ret_offset = p;
-
- return 1;
- }
-
- r = next_hash_offset(
- f,
- &p,
- &o->field.next_hash_offset,
- &depth,
- JOURNAL_HEADER_CONTAINS(f->header, field_hash_chain_depth) ? &f->header->field_hash_chain_depth : NULL);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-uint64_t journal_file_hash_data(
- JournalFile *f,
- const void *data,
- size_t sz) {
-
- assert(f);
- assert(data || sz == 0);
-
- /* We try to unify our codebase on siphash, hence new-styled journal files utilizing the keyed hash
- * function use siphash. Old journal files use the Jenkins hash. */
-
- if (JOURNAL_HEADER_KEYED_HASH(f->header))
- return siphash24(data, sz, f->header->file_id.bytes);
-
- return jenkins_hash64(data, sz);
-}
-
-int journal_file_find_field_object(
- JournalFile *f,
- const void *field, uint64_t size,
- Object **ret, uint64_t *ret_offset) {
-
- assert(f);
- assert(field && size > 0);
-
- return journal_file_find_field_object_with_hash(
- f,
- field, size,
- journal_file_hash_data(f, field, size),
- ret, ret_offset);
-}
-
-int journal_file_find_data_object_with_hash(
- JournalFile *f,
- const void *data, uint64_t size, uint64_t hash,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t p, osize, h, m, depth = 0;
- int r;
-
- assert(f);
- assert(f->header);
- assert(data || size == 0);
-
- /* If there's no data hash table, then there's no entry. */
- if (le64toh(f->header->data_hash_table_size) <= 0)
- return 0;
-
- /* Map the data hash table, if it isn't mapped yet. */
- r = journal_file_map_data_hash_table(f);
- if (r < 0)
- return r;
-
- osize = offsetof(Object, data.payload) + size;
-
- m = le64toh(READ_NOW(f->header->data_hash_table_size)) / sizeof(HashItem);
- if (m <= 0)
- return -EBADMSG;
-
- h = hash % m;
- p = le64toh(f->data_hash_table[h].head_hash_offset);
-
- while (p > 0) {
- Object *o;
-
- r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
- if (r < 0)
- return r;
-
- if (le64toh(o->data.hash) != hash)
- goto next;
-
- if (o->object.flags & OBJECT_COMPRESSION_MASK) {
-#if HAVE_COMPRESSION
- uint64_t l;
- size_t rsize = 0;
-
- l = le64toh(READ_NOW(o->object.size));
- if (l <= offsetof(Object, data.payload))
- return -EBADMSG;
-
- l -= offsetof(Object, data.payload);
-
- r = decompress_blob(o->object.flags & OBJECT_COMPRESSION_MASK,
- o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize, 0);
- if (r < 0)
- return r;
-
- if (rsize == size &&
- memcmp(f->compress_buffer, data, size) == 0) {
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 1;
- }
-#else
- return -EPROTONOSUPPORT;
-#endif
- } else if (le64toh(o->object.size) == osize &&
- memcmp(o->data.payload, data, size) == 0) {
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 1;
- }
-
- next:
- r = next_hash_offset(
- f,
- &p,
- &o->data.next_hash_offset,
- &depth,
- JOURNAL_HEADER_CONTAINS(f->header, data_hash_chain_depth) ? &f->header->data_hash_chain_depth : NULL);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-int journal_file_find_data_object(
- JournalFile *f,
- const void *data, uint64_t size,
- Object **ret, uint64_t *ret_offset) {
-
- assert(f);
- assert(data || size == 0);
-
- return journal_file_find_data_object_with_hash(
- f,
- data, size,
- journal_file_hash_data(f, data, size),
- ret, ret_offset);
-}
-
-bool journal_field_valid(const char *p, size_t l, bool allow_protected) {
- /* We kinda enforce POSIX syntax recommendations for
- environment variables here, but make a couple of additional
- requirements.
-
- http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
-
- if (l == (size_t) -1)
- l = strlen(p);
-
- /* No empty field names */
- if (l <= 0)
- return false;
-
- /* Don't allow names longer than 64 chars */
- if (l > 64)
- return false;
-
- /* Variables starting with an underscore are protected */
- if (!allow_protected && p[0] == '_')
- return false;
-
- /* Don't allow digits as first character */
- if (p[0] >= '0' && p[0] <= '9')
- return false;
-
- /* Only allow A-Z0-9 and '_' */
- for (const char *a = p; a < p + l; a++)
- if ((*a < 'A' || *a > 'Z') &&
- (*a < '0' || *a > '9') &&
- *a != '_')
- return false;
-
- return true;
-}
-
-static int journal_file_append_field(
- JournalFile *f,
- const void *field, uint64_t size,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t hash, p;
- uint64_t osize;
- Object *o;
- int r;
-
- assert(f);
- assert(field && size > 0);
-
- if (!journal_field_valid(field, size, true))
- return -EBADMSG;
-
- hash = journal_file_hash_data(f, field, size);
-
- r = journal_file_find_field_object_with_hash(f, field, size, hash, &o, &p);
- if (r < 0)
- return r;
- else if (r > 0) {
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 0;
- }
-
- osize = offsetof(Object, field.payload) + size;
- r = journal_file_append_object(f, OBJECT_FIELD, osize, &o, &p);
- if (r < 0)
- return r;
-
- o->field.hash = htole64(hash);
- memcpy(o->field.payload, field, size);
-
- r = journal_file_link_field(f, o, p, hash);
- if (r < 0)
- return r;
-
- /* The linking might have altered the window, so let's
- * refresh our pointer */
- r = journal_file_move_to_object(f, OBJECT_FIELD, p, &o);
- if (r < 0)
- return r;
-
-#if HAVE_GCRYPT
- r = journal_file_hmac_put_object(f, OBJECT_FIELD, o, p);
- if (r < 0)
- return r;
-#endif
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 0;
-}
-
-static int journal_file_append_data(
- JournalFile *f,
- const void *data, uint64_t size,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t hash, p;
- uint64_t osize;
- Object *o;
- int r, compression = 0;
- const void *eq;
-
- assert(f);
- assert(data || size == 0);
-
- hash = journal_file_hash_data(f, data, size);
-
- r = journal_file_find_data_object_with_hash(f, data, size, hash, &o, &p);
- if (r < 0)
- return r;
- if (r > 0) {
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 0;
- }
-
- osize = offsetof(Object, data.payload) + size;
- r = journal_file_append_object(f, OBJECT_DATA, osize, &o, &p);
- if (r < 0)
- return r;
-
- o->data.hash = htole64(hash);
-
-#if HAVE_COMPRESSION
- if (JOURNAL_FILE_COMPRESS(f) && size >= f->compress_threshold_bytes) {
- size_t rsize = 0;
-
- compression = compress_blob(data, size, o->data.payload, size - 1, &rsize);
-
- if (compression >= 0) {
- o->object.size = htole64(offsetof(Object, data.payload) + rsize);
- o->object.flags |= compression;
-
- log_debug("Compressed data object %"PRIu64" -> %zu using %s",
- size, rsize, object_compressed_to_string(compression));
- } else
- /* Compression didn't work, we don't really care why, let's continue without compression */
- compression = 0;
- }
-#endif
-
- if (compression == 0)
- memcpy_safe(o->data.payload, data, size);
-
- r = journal_file_link_data(f, o, p, hash);
- if (r < 0)
- return r;
-
-#if HAVE_GCRYPT
- r = journal_file_hmac_put_object(f, OBJECT_DATA, o, p);
- if (r < 0)
- return r;
-#endif
-
- /* The linking might have altered the window, so let's
- * refresh our pointer */
- r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
- if (r < 0)
- return r;
-
- if (!data)
- eq = NULL;
- else
- eq = memchr(data, '=', size);
- if (eq && eq > data) {
- Object *fo = NULL;
- uint64_t fp;
-
- /* Create field object ... */
- r = journal_file_append_field(f, data, (uint8_t*) eq - (uint8_t*) data, &fo, &fp);
- if (r < 0)
- return r;
-
- /* ... and link it in. */
- o->data.next_field_offset = fo->field.head_data_offset;
- fo->field.head_data_offset = le64toh(p);
- }
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 0;
-}
-
-uint64_t journal_file_entry_n_items(Object *o) {
- uint64_t sz;
- assert(o);
-
- if (o->object.type != OBJECT_ENTRY)
- return 0;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(Object, entry.items))
- return 0;
-
- return (sz - offsetof(Object, entry.items)) / sizeof(EntryItem);
-}
-
-uint64_t journal_file_entry_array_n_items(Object *o) {
- uint64_t sz;
-
- assert(o);
-
- if (o->object.type != OBJECT_ENTRY_ARRAY)
- return 0;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(Object, entry_array.items))
- return 0;
-
- return (sz - offsetof(Object, entry_array.items)) / sizeof(uint64_t);
-}
-
-uint64_t journal_file_hash_table_n_items(Object *o) {
- uint64_t sz;
-
- assert(o);
-
- if (!IN_SET(o->object.type, OBJECT_DATA_HASH_TABLE, OBJECT_FIELD_HASH_TABLE))
- return 0;
-
- sz = le64toh(READ_NOW(o->object.size));
- if (sz < offsetof(Object, hash_table.items))
- return 0;
-
- return (sz - offsetof(Object, hash_table.items)) / sizeof(HashItem);
-}
-
-static int link_entry_into_array(JournalFile *f,
- le64_t *first,
- le64_t *idx,
- uint64_t p) {
- int r;
- uint64_t n = 0, ap = 0, q, i, a, hidx;
- Object *o;
-
- assert(f);
- assert(f->header);
- assert(first);
- assert(idx);
- assert(p > 0);
-
- a = le64toh(*first);
- i = hidx = le64toh(READ_NOW(*idx));
- while (a > 0) {
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
- if (r < 0)
- return r;
-
- n = journal_file_entry_array_n_items(o);
- if (i < n) {
- o->entry_array.items[i] = htole64(p);
- *idx = htole64(hidx + 1);
- return 0;
- }
-
- i -= n;
- ap = a;
- a = le64toh(o->entry_array.next_entry_array_offset);
- }
-
- if (hidx > n)
- n = (hidx+1) * 2;
- else
- n = n * 2;
-
- if (n < 4)
- n = 4;
-
- r = journal_file_append_object(f, OBJECT_ENTRY_ARRAY,
- offsetof(Object, entry_array.items) + n * sizeof(uint64_t),
- &o, &q);
- if (r < 0)
- return r;
-
-#if HAVE_GCRYPT
- r = journal_file_hmac_put_object(f, OBJECT_ENTRY_ARRAY, o, q);
- if (r < 0)
- return r;
-#endif
-
- o->entry_array.items[i] = htole64(p);
-
- if (ap == 0)
- *first = htole64(q);
- else {
- r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, ap, &o);
- if (r < 0)
- return r;
-
- o->entry_array.next_entry_array_offset = htole64(q);
- }
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays))
- f->header->n_entry_arrays = htole64(le64toh(f->header->n_entry_arrays) + 1);
-
- *idx = htole64(hidx + 1);
-
- return 0;
-}
-
-static int link_entry_into_array_plus_one(JournalFile *f,
- le64_t *extra,
- le64_t *first,
- le64_t *idx,
- uint64_t p) {
-
- uint64_t hidx;
- int r;
-
- assert(f);
- assert(extra);
- assert(first);
- assert(idx);
- assert(p > 0);
-
- hidx = le64toh(READ_NOW(*idx));
- if (hidx == UINT64_MAX)
- return -EBADMSG;
- if (hidx == 0)
- *extra = htole64(p);
- else {
- le64_t i;
-
- i = htole64(hidx - 1);
- r = link_entry_into_array(f, first, &i, p);
- if (r < 0)
- return r;
- }
-
- *idx = htole64(hidx + 1);
- return 0;
-}
-
-static int journal_file_link_entry_item(JournalFile *f, Object *o, uint64_t offset, uint64_t i) {
- uint64_t p;
- int r;
-
- assert(f);
- assert(o);
- assert(offset > 0);
-
- p = le64toh(o->entry.items[i].object_offset);
- r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
- if (r < 0)
- return r;
-
- return link_entry_into_array_plus_one(f,
- &o->data.entry_offset,
- &o->data.entry_array_offset,
- &o->data.n_entries,
- offset);
-}
-
-static int journal_file_link_entry(JournalFile *f, Object *o, uint64_t offset) {
- uint64_t n;
- int r;
-
- assert(f);
- assert(f->header);
- assert(o);
- assert(offset > 0);
-
- if (o->object.type != OBJECT_ENTRY)
- return -EINVAL;
-
- __sync_synchronize();
-
- /* Link up the entry itself */
- r = link_entry_into_array(f,
- &f->header->entry_array_offset,
- &f->header->n_entries,
- offset);
- if (r < 0)
- return r;
-
- /* log_debug("=> %s seqnr=%"PRIu64" n_entries=%"PRIu64, f->path, o->entry.seqnum, f->header->n_entries); */
-
- if (f->header->head_entry_realtime == 0)
- f->header->head_entry_realtime = o->entry.realtime;
-
- f->header->tail_entry_realtime = o->entry.realtime;
- f->header->tail_entry_monotonic = o->entry.monotonic;
-
- /* Link up the items */
- n = journal_file_entry_n_items(o);
- for (uint64_t i = 0; i < n; i++) {
- r = journal_file_link_entry_item(f, o, offset, i);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static int journal_file_append_entry_internal(
- JournalFile *f,
- const dual_timestamp *ts,
- const sd_id128_t *boot_id,
- uint64_t xor_hash,
- const EntryItem items[], unsigned n_items,
- uint64_t *seqnum,
- Object **ret, uint64_t *ret_offset) {
- uint64_t np;
- uint64_t osize;
- Object *o;
- int r;
-
- assert(f);
- assert(f->header);
- assert(items || n_items == 0);
- assert(ts);
-
- osize = offsetof(Object, entry.items) + (n_items * sizeof(EntryItem));
-
- r = journal_file_append_object(f, OBJECT_ENTRY, osize, &o, &np);
- if (r < 0)
- return r;
-
- o->entry.seqnum = htole64(journal_file_entry_seqnum(f, seqnum));
- memcpy_safe(o->entry.items, items, n_items * sizeof(EntryItem));
- o->entry.realtime = htole64(ts->realtime);
- o->entry.monotonic = htole64(ts->monotonic);
- o->entry.xor_hash = htole64(xor_hash);
- if (boot_id)
- f->header->boot_id = *boot_id;
- o->entry.boot_id = f->header->boot_id;
-
-#if HAVE_GCRYPT
- r = journal_file_hmac_put_object(f, OBJECT_ENTRY, o, np);
- if (r < 0)
- return r;
-#endif
-
- r = journal_file_link_entry(f, o, np);
- if (r < 0)
- return r;
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = np;
-
- return 0;
-}
-
-void journal_file_post_change(JournalFile *f) {
- assert(f);
-
- if (f->fd < 0)
- return;
-
- /* inotify() does not receive IN_MODIFY events from file
- * accesses done via mmap(). After each access we hence
- * trigger IN_MODIFY by truncating the journal file to its
- * current size which triggers IN_MODIFY. */
-
- __sync_synchronize();
-
- if (ftruncate(f->fd, f->last_stat.st_size) < 0)
- log_debug_errno(errno, "Failed to truncate file to its own size: %m");
-}
-
-static int post_change_thunk(sd_event_source *timer, uint64_t usec, void *userdata) {
- assert(userdata);
-
- journal_file_post_change(userdata);
-
- return 1;
-}
-
-static void schedule_post_change(JournalFile *f) {
- int r;
-
- assert(f);
- assert(f->post_change_timer);
-
- r = sd_event_source_get_enabled(f->post_change_timer, NULL);
- if (r < 0) {
- log_debug_errno(r, "Failed to get ftruncate timer state: %m");
- goto fail;
- }
- if (r > 0)
- return;
-
- r = sd_event_source_set_time_relative(f->post_change_timer, f->post_change_timer_period);
- if (r < 0) {
- log_debug_errno(r, "Failed to set time for scheduling ftruncate: %m");
- goto fail;
- }
-
- r = sd_event_source_set_enabled(f->post_change_timer, SD_EVENT_ONESHOT);
- if (r < 0) {
- log_debug_errno(r, "Failed to enable scheduled ftruncate: %m");
- goto fail;
- }
-
- return;
-
-fail:
- /* On failure, let's simply post the change immediately. */
- journal_file_post_change(f);
-}
-
-/* Enable coalesced change posting in a timer on the provided sd_event instance */
-int journal_file_enable_post_change_timer(JournalFile *f, sd_event *e, usec_t t) {
- _cleanup_(sd_event_source_unrefp) sd_event_source *timer = NULL;
- int r;
-
- assert(f);
- assert_return(!f->post_change_timer, -EINVAL);
- assert(e);
- assert(t);
-
- r = sd_event_add_time(e, &timer, CLOCK_MONOTONIC, 0, 0, post_change_thunk, f);
- if (r < 0)
- return r;
-
- r = sd_event_source_set_enabled(timer, SD_EVENT_OFF);
- if (r < 0)
- return r;
-
- f->post_change_timer = TAKE_PTR(timer);
- f->post_change_timer_period = t;
-
- return r;
-}
-
-static int entry_item_cmp(const EntryItem *a, const EntryItem *b) {
- return CMP(le64toh(a->object_offset), le64toh(b->object_offset));
-}
-
-int journal_file_append_entry(
- JournalFile *f,
- const dual_timestamp *ts,
- const sd_id128_t *boot_id,
- const struct iovec iovec[], unsigned n_iovec,
- uint64_t *seqnum,
- Object **ret, uint64_t *ret_offset) {
-
- EntryItem *items;
- int r;
- uint64_t xor_hash = 0;
- struct dual_timestamp _ts;
-
- assert(f);
- assert(f->header);
- assert(iovec || n_iovec == 0);
-
- if (ts) {
- if (!VALID_REALTIME(ts->realtime))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid realtime timestamp %" PRIu64 ", refusing entry.",
- ts->realtime);
- if (!VALID_MONOTONIC(ts->monotonic))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "Invalid monotomic timestamp %" PRIu64 ", refusing entry.",
- ts->monotonic);
- } else {
- dual_timestamp_get(&_ts);
- ts = &_ts;
- }
-
-#if HAVE_GCRYPT
- r = journal_file_maybe_append_tag(f, ts->realtime);
- if (r < 0)
- return r;
-#endif
-
- /* alloca() can't take 0, hence let's allocate at least one */
- items = newa(EntryItem, MAX(1u, n_iovec));
-
- for (unsigned i = 0; i < n_iovec; i++) {
- uint64_t p;
- Object *o;
-
- r = journal_file_append_data(f, iovec[i].iov_base, iovec[i].iov_len, &o, &p);
- if (r < 0)
- return r;
-
- /* When calculating the XOR hash field, we need to take special care if the "keyed-hash"
- * journal file flag is on. We use the XOR hash field to quickly determine the identity of a
- * specific record, and give records with otherwise identical position (i.e. match in seqno,
- * timestamp, …) a stable ordering. But for that we can't have it that the hash of the
- * objects in each file is different since they are keyed. Hence let's calculate the Jenkins
- * hash here for that. This also has the benefit that cursors for old and new journal files
- * are completely identical (they include the XOR hash after all). For classic Jenkins-hash
- * files things are easier, we can just take the value from the stored record directly. */
-
- if (JOURNAL_HEADER_KEYED_HASH(f->header))
- xor_hash ^= jenkins_hash64(iovec[i].iov_base, iovec[i].iov_len);
- else
- xor_hash ^= le64toh(o->data.hash);
-
- items[i].object_offset = htole64(p);
- items[i].hash = o->data.hash;
- }
-
- /* Order by the position on disk, in order to improve seek
- * times for rotating media. */
- typesafe_qsort(items, n_iovec, entry_item_cmp);
-
- r = journal_file_append_entry_internal(f, ts, boot_id, xor_hash, items, n_iovec, seqnum, ret, ret_offset);
-
- /* If the memory mapping triggered a SIGBUS then we return an
- * IO error and ignore the error code passed down to us, since
- * it is very likely just an effect of a nullified replacement
- * mapping page */
-
- if (mmap_cache_got_sigbus(f->mmap, f->cache_fd))
- r = -EIO;
-
- if (f->post_change_timer)
- schedule_post_change(f);
- else
- journal_file_post_change(f);
-
- return r;
-}
-
-typedef struct ChainCacheItem {
- uint64_t first; /* the array at the beginning of the chain */
- uint64_t array; /* the cached array */
- uint64_t begin; /* the first item in the cached array */
- uint64_t total; /* the total number of items in all arrays before this one in the chain */
- uint64_t last_index; /* the last index we looked at, to optimize locality when bisecting */
-} ChainCacheItem;
-
-static void chain_cache_put(
- OrderedHashmap *h,
- ChainCacheItem *ci,
- uint64_t first,
- uint64_t array,
- uint64_t begin,
- uint64_t total,
- uint64_t last_index) {
-
- if (!ci) {
- /* If the chain item to cache for this chain is the
- * first one it's not worth caching anything */
- if (array == first)
- return;
-
- if (ordered_hashmap_size(h) >= CHAIN_CACHE_MAX) {
- ci = ordered_hashmap_steal_first(h);
- assert(ci);
- } else {
- ci = new(ChainCacheItem, 1);
- if (!ci)
- return;
- }
-
- ci->first = first;
-
- if (ordered_hashmap_put(h, &ci->first, ci) < 0) {
- free(ci);
- return;
- }
- } else
- assert(ci->first == first);
-
- ci->array = array;
- ci->begin = begin;
- ci->total = total;
- ci->last_index = last_index;
-}
-
-static int generic_array_get(
- JournalFile *f,
- uint64_t first,
- uint64_t i,
- Object **ret, uint64_t *ret_offset) {
-
- Object *o;
- uint64_t p = 0, a, t = 0;
- int r;
- ChainCacheItem *ci;
-
- assert(f);
-
- a = first;
-
- /* Try the chain cache first */
- ci = ordered_hashmap_get(f->chain_cache, &first);
- if (ci && i > ci->total) {
- a = ci->array;
- i -= ci->total;
- t = ci->total;
- }
-
- while (a > 0) {
- uint64_t k;
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
- if (r < 0)
- return r;
-
- k = journal_file_entry_array_n_items(o);
- if (i < k) {
- p = le64toh(o->entry_array.items[i]);
- goto found;
- }
-
- i -= k;
- t += k;
- a = le64toh(o->entry_array.next_entry_array_offset);
- }
-
- return 0;
-
-found:
- /* Let's cache this item for the next invocation */
- chain_cache_put(f->chain_cache, ci, first, a, le64toh(o->entry_array.items[0]), t, i);
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- return 1;
-}
-
-static int generic_array_get_plus_one(
- JournalFile *f,
- uint64_t extra,
- uint64_t first,
- uint64_t i,
- Object **ret, uint64_t *ret_offset) {
-
- Object *o;
-
- assert(f);
-
- if (i == 0) {
- int r;
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, extra, &o);
- if (r < 0)
- return r;
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = extra;
-
- return 1;
- }
-
- return generic_array_get(f, first, i-1, ret, ret_offset);
-}
-
-enum {
- TEST_FOUND,
- TEST_LEFT,
- TEST_RIGHT
-};
-
-static int generic_array_bisect(
- JournalFile *f,
- uint64_t first,
- uint64_t n,
- uint64_t needle,
- int (*test_object)(JournalFile *f, uint64_t p, uint64_t needle),
- direction_t direction,
- Object **ret,
- uint64_t *ret_offset,
- uint64_t *ret_idx) {
-
- uint64_t a, p, t = 0, i = 0, last_p = 0, last_index = (uint64_t) -1;
- bool subtract_one = false;
- Object *o, *array = NULL;
- int r;
- ChainCacheItem *ci;
-
- assert(f);
- assert(test_object);
-
- /* Start with the first array in the chain */
- a = first;
-
- ci = ordered_hashmap_get(f->chain_cache, &first);
- if (ci && n > ci->total && ci->begin != 0) {
- /* Ah, we have iterated this bisection array chain
- * previously! Let's see if we can skip ahead in the
- * chain, as far as the last time. But we can't jump
- * backwards in the chain, so let's check that
- * first. */
-
- r = test_object(f, ci->begin, needle);
- if (r < 0)
- return r;
-
- if (r == TEST_LEFT) {
- /* OK, what we are looking for is right of the
- * begin of this EntryArray, so let's jump
- * straight to previously cached array in the
- * chain */
-
- a = ci->array;
- n -= ci->total;
- t = ci->total;
- last_index = ci->last_index;
- }
- }
-
- while (a > 0) {
- uint64_t left, right, k, lp;
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &array);
- if (r < 0)
- return r;
-
- k = journal_file_entry_array_n_items(array);
- right = MIN(k, n);
- if (right <= 0)
- return 0;
-
- i = right - 1;
- lp = p = le64toh(array->entry_array.items[i]);
- if (p <= 0)
- r = -EBADMSG;
- else
- r = test_object(f, p, needle);
- if (r == -EBADMSG) {
- log_debug_errno(r, "Encountered invalid entry while bisecting, cutting algorithm short. (1)");
- n = i;
- continue;
- }
- if (r < 0)
- return r;
-
- if (r == TEST_FOUND)
- r = direction == DIRECTION_DOWN ? TEST_RIGHT : TEST_LEFT;
-
- if (r == TEST_RIGHT) {
- left = 0;
- right -= 1;
-
- if (last_index != (uint64_t) -1) {
- assert(last_index <= right);
-
- /* If we cached the last index we
- * looked at, let's try to not to jump
- * too wildly around and see if we can
- * limit the range to look at early to
- * the immediate neighbors of the last
- * index we looked at. */
-
- if (last_index > 0) {
- uint64_t x = last_index - 1;
-
- p = le64toh(array->entry_array.items[x]);
- if (p <= 0)
- return -EBADMSG;
-
- r = test_object(f, p, needle);
- if (r < 0)
- return r;
-
- if (r == TEST_FOUND)
- r = direction == DIRECTION_DOWN ? TEST_RIGHT : TEST_LEFT;
-
- if (r == TEST_RIGHT)
- right = x;
- else
- left = x + 1;
- }
-
- if (last_index < right) {
- uint64_t y = last_index + 1;
-
- p = le64toh(array->entry_array.items[y]);
- if (p <= 0)
- return -EBADMSG;
-
- r = test_object(f, p, needle);
- if (r < 0)
- return r;
-
- if (r == TEST_FOUND)
- r = direction == DIRECTION_DOWN ? TEST_RIGHT : TEST_LEFT;
-
- if (r == TEST_RIGHT)
- right = y;
- else
- left = y + 1;
- }
- }
-
- for (;;) {
- if (left == right) {
- if (direction == DIRECTION_UP)
- subtract_one = true;
-
- i = left;
- goto found;
- }
-
- assert(left < right);
- i = (left + right) / 2;
-
- p = le64toh(array->entry_array.items[i]);
- if (p <= 0)
- r = -EBADMSG;
- else
- r = test_object(f, p, needle);
- if (r == -EBADMSG) {
- log_debug_errno(r, "Encountered invalid entry while bisecting, cutting algorithm short. (2)");
- right = n = i;
- continue;
- }
- if (r < 0)
- return r;
-
- if (r == TEST_FOUND)
- r = direction == DIRECTION_DOWN ? TEST_RIGHT : TEST_LEFT;
-
- if (r == TEST_RIGHT)
- right = i;
- else
- left = i + 1;
- }
- }
-
- if (k >= n) {
- if (direction == DIRECTION_UP) {
- i = n;
- subtract_one = true;
- goto found;
- }
-
- return 0;
- }
-
- last_p = lp;
-
- n -= k;
- t += k;
- last_index = (uint64_t) -1;
- a = le64toh(array->entry_array.next_entry_array_offset);
- }
-
- return 0;
-
-found:
- if (subtract_one && t == 0 && i == 0)
- return 0;
-
- /* Let's cache this item for the next invocation */
- chain_cache_put(f->chain_cache, ci, first, a, le64toh(array->entry_array.items[0]), t, subtract_one ? (i > 0 ? i-1 : (uint64_t) -1) : i);
-
- if (subtract_one && i == 0)
- p = last_p;
- else if (subtract_one)
- p = le64toh(array->entry_array.items[i-1]);
- else
- p = le64toh(array->entry_array.items[i]);
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = p;
-
- if (ret_idx)
- *ret_idx = t + i + (subtract_one ? -1 : 0);
-
- return 1;
-}
-
-static int generic_array_bisect_plus_one(
- JournalFile *f,
- uint64_t extra,
- uint64_t first,
- uint64_t n,
- uint64_t needle,
- int (*test_object)(JournalFile *f, uint64_t p, uint64_t needle),
- direction_t direction,
- Object **ret,
- uint64_t *ret_offset,
- uint64_t *ret_idx) {
-
- int r;
- bool step_back = false;
- Object *o;
-
- assert(f);
- assert(test_object);
-
- if (n <= 0)
- return 0;
-
- /* This bisects the array in object 'first', but first checks
- * an extra */
- r = test_object(f, extra, needle);
- if (r < 0)
- return r;
-
- if (r == TEST_FOUND)
- r = direction == DIRECTION_DOWN ? TEST_RIGHT : TEST_LEFT;
-
- /* if we are looking with DIRECTION_UP then we need to first
- see if in the actual array there is a matching entry, and
- return the last one of that. But if there isn't any we need
- to return this one. Hence remember this, and return it
- below. */
- if (r == TEST_LEFT)
- step_back = direction == DIRECTION_UP;
-
- if (r == TEST_RIGHT) {
- if (direction == DIRECTION_DOWN)
- goto found;
- else
- return 0;
- }
-
- r = generic_array_bisect(f, first, n-1, needle, test_object, direction, ret, ret_offset, ret_idx);
-
- if (r == 0 && step_back)
- goto found;
-
- if (r > 0 && ret_idx)
- (*ret_idx)++;
-
- return r;
-
-found:
- r = journal_file_move_to_object(f, OBJECT_ENTRY, extra, &o);
- if (r < 0)
- return r;
-
- if (ret)
- *ret = o;
-
- if (ret_offset)
- *ret_offset = extra;
-
- if (ret_idx)
- *ret_idx = 0;
-
- return 1;
-}
-
-_pure_ static int test_object_offset(JournalFile *f, uint64_t p, uint64_t needle) {
- assert(f);
- assert(p > 0);
-
- if (p == needle)
- return TEST_FOUND;
- else if (p < needle)
- return TEST_LEFT;
- else
- return TEST_RIGHT;
-}
-
-static int test_object_seqnum(JournalFile *f, uint64_t p, uint64_t needle) {
- uint64_t sq;
- Object *o;
- int r;
-
- assert(f);
- assert(p > 0);
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
-
- sq = le64toh(READ_NOW(o->entry.seqnum));
- if (sq == needle)
- return TEST_FOUND;
- else if (sq < needle)
- return TEST_LEFT;
- else
- return TEST_RIGHT;
-}
-
-int journal_file_move_to_entry_by_seqnum(
- JournalFile *f,
- uint64_t seqnum,
- direction_t direction,
- Object **ret,
- uint64_t *ret_offset) {
- assert(f);
- assert(f->header);
-
- return generic_array_bisect(
- f,
- le64toh(f->header->entry_array_offset),
- le64toh(f->header->n_entries),
- seqnum,
- test_object_seqnum,
- direction,
- ret, ret_offset, NULL);
-}
-
-static int test_object_realtime(JournalFile *f, uint64_t p, uint64_t needle) {
- Object *o;
- uint64_t rt;
- int r;
-
- assert(f);
- assert(p > 0);
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
-
- rt = le64toh(READ_NOW(o->entry.realtime));
- if (rt == needle)
- return TEST_FOUND;
- else if (rt < needle)
- return TEST_LEFT;
- else
- return TEST_RIGHT;
-}
-
-int journal_file_move_to_entry_by_realtime(
- JournalFile *f,
- uint64_t realtime,
- direction_t direction,
- Object **ret,
- uint64_t *ret_offset) {
- assert(f);
- assert(f->header);
-
- return generic_array_bisect(
- f,
- le64toh(f->header->entry_array_offset),
- le64toh(f->header->n_entries),
- realtime,
- test_object_realtime,
- direction,
- ret, ret_offset, NULL);
-}
-
-static int test_object_monotonic(JournalFile *f, uint64_t p, uint64_t needle) {
- Object *o;
- uint64_t m;
- int r;
-
- assert(f);
- assert(p > 0);
-
- r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
-
- m = le64toh(READ_NOW(o->entry.monotonic));
- if (m == needle)
- return TEST_FOUND;
- else if (m < needle)
- return TEST_LEFT;
- else
- return TEST_RIGHT;
-}
-
-static int find_data_object_by_boot_id(
- JournalFile *f,
- sd_id128_t boot_id,
- Object **o,
- uint64_t *b) {
-
- char t[STRLEN("_BOOT_ID=") + 32 + 1] = "_BOOT_ID=";
-
- sd_id128_to_string(boot_id, t + 9);
- return journal_file_find_data_object(f, t, sizeof(t) - 1, o, b);
-}
-
-int journal_file_move_to_entry_by_monotonic(
- JournalFile *f,
- sd_id128_t boot_id,
- uint64_t monotonic,
- direction_t direction,
- Object **ret,
- uint64_t *ret_offset) {
-
- Object *o;
- int r;
-
- assert(f);
-
- r = find_data_object_by_boot_id(f, boot_id, &o, NULL);
- if (r < 0)
- return r;
- if (r == 0)
- return -ENOENT;
-
- return generic_array_bisect_plus_one(
- f,
- le64toh(o->data.entry_offset),
- le64toh(o->data.entry_array_offset),
- le64toh(o->data.n_entries),
- monotonic,
- test_object_monotonic,
- direction,
- ret, ret_offset, NULL);
-}
-
-void journal_file_reset_location(JournalFile *f) {
- f->location_type = LOCATION_HEAD;
- f->current_offset = 0;
- f->current_seqnum = 0;
- f->current_realtime = 0;
- f->current_monotonic = 0;
- zero(f->current_boot_id);
- f->current_xor_hash = 0;
-}
-
-void journal_file_save_location(JournalFile *f, Object *o, uint64_t offset) {
- f->location_type = LOCATION_SEEK;
- f->current_offset = offset;
- f->current_seqnum = le64toh(o->entry.seqnum);
- f->current_realtime = le64toh(o->entry.realtime);
- f->current_monotonic = le64toh(o->entry.monotonic);
- f->current_boot_id = o->entry.boot_id;
- f->current_xor_hash = le64toh(o->entry.xor_hash);
-}
-
-int journal_file_compare_locations(JournalFile *af, JournalFile *bf) {
- int r;
-
- assert(af);
- assert(af->header);
- assert(bf);
- assert(bf->header);
- assert(af->location_type == LOCATION_SEEK);
- assert(bf->location_type == LOCATION_SEEK);
-
- /* If contents, timestamps and seqnum match, these entries are
- * identical*/
- if (sd_id128_equal(af->current_boot_id, bf->current_boot_id) &&
- af->current_monotonic == bf->current_monotonic &&
- af->current_realtime == bf->current_realtime &&
- af->current_xor_hash == bf->current_xor_hash &&
- sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id) &&
- af->current_seqnum == bf->current_seqnum)
- return 0;
-
- if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
-
- /* If this is from the same seqnum source, compare
- * seqnums */
- r = CMP(af->current_seqnum, bf->current_seqnum);
- if (r != 0)
- return r;
-
- /* Wow! This is weird, different data but the same
- * seqnums? Something is borked, but let's make the
- * best of it and compare by time. */
- }
-
- if (sd_id128_equal(af->current_boot_id, bf->current_boot_id)) {
-
- /* If the boot id matches, compare monotonic time */
- r = CMP(af->current_monotonic, bf->current_monotonic);
- if (r != 0)
- return r;
- }
-
- /* Otherwise, compare UTC time */
- r = CMP(af->current_realtime, bf->current_realtime);
- if (r != 0)
- return r;
-
- /* Finally, compare by contents */
- return CMP(af->current_xor_hash, bf->current_xor_hash);
-}
-
-static int bump_array_index(uint64_t *i, direction_t direction, uint64_t n) {
-
- /* Increase or decrease the specified index, in the right direction. */
-
- if (direction == DIRECTION_DOWN) {
- if (*i >= n - 1)
- return 0;
-
- (*i) ++;
- } else {
- if (*i <= 0)
- return 0;
-
- (*i) --;
- }
-
- return 1;
-}
-
-static bool check_properly_ordered(uint64_t new_offset, uint64_t old_offset, direction_t direction) {
-
- /* Consider it an error if any of the two offsets is uninitialized */
- if (old_offset == 0 || new_offset == 0)
- return false;
-
- /* If we go down, the new offset must be larger than the old one. */
- return direction == DIRECTION_DOWN ?
- new_offset > old_offset :
- new_offset < old_offset;
-}
-
-int journal_file_next_entry(
- JournalFile *f,
- uint64_t p,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t i, n, ofs;
- int r;
-
- assert(f);
- assert(f->header);
-
- n = le64toh(READ_NOW(f->header->n_entries));
- if (n <= 0)
- return 0;
-
- if (p == 0)
- i = direction == DIRECTION_DOWN ? 0 : n - 1;
- else {
- r = generic_array_bisect(f,
- le64toh(f->header->entry_array_offset),
- le64toh(f->header->n_entries),
- p,
- test_object_offset,
- DIRECTION_DOWN,
- NULL, NULL,
- &i);
- if (r <= 0)
- return r;
-
- r = bump_array_index(&i, direction, n);
- if (r <= 0)
- return r;
- }
-
- /* And jump to it */
- for (;;) {
- r = generic_array_get(f,
- le64toh(f->header->entry_array_offset),
- i,
- ret, &ofs);
- if (r > 0)
- break;
- if (r != -EBADMSG)
- return r;
-
- /* OK, so this entry is borked. Most likely some entry didn't get synced to disk properly, let's see if
- * the next one might work for us instead. */
- log_debug_errno(r, "Entry item %" PRIu64 " is bad, skipping over it.", i);
-
- r = bump_array_index(&i, direction, n);
- if (r <= 0)
- return r;
- }
-
- /* Ensure our array is properly ordered. */
- if (p > 0 && !check_properly_ordered(ofs, p, direction))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "%s: entry array not properly ordered at entry %" PRIu64,
- f->path, i);
-
- if (ret_offset)
- *ret_offset = ofs;
-
- return 1;
-}
-
-int journal_file_next_entry_for_data(
- JournalFile *f,
- Object *o, uint64_t p,
- uint64_t data_offset,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- uint64_t i, n, ofs;
- Object *d;
- int r;
-
- assert(f);
- assert(p > 0 || !o);
-
- r = journal_file_move_to_object(f, OBJECT_DATA, data_offset, &d);
- if (r < 0)
- return r;
-
- n = le64toh(READ_NOW(d->data.n_entries));
- if (n <= 0)
- return n;
-
- if (!o)
- i = direction == DIRECTION_DOWN ? 0 : n - 1;
- else {
- if (o->object.type != OBJECT_ENTRY)
- return -EINVAL;
-
- r = generic_array_bisect_plus_one(f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- le64toh(d->data.n_entries),
- p,
- test_object_offset,
- DIRECTION_DOWN,
- NULL, NULL,
- &i);
-
- if (r <= 0)
- return r;
-
- r = bump_array_index(&i, direction, n);
- if (r <= 0)
- return r;
- }
-
- for (;;) {
- r = generic_array_get_plus_one(f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- i,
- ret, &ofs);
- if (r > 0)
- break;
- if (r != -EBADMSG)
- return r;
-
- log_debug_errno(r, "Data entry item %" PRIu64 " is bad, skipping over it.", i);
-
- r = bump_array_index(&i, direction, n);
- if (r <= 0)
- return r;
- }
-
- /* Ensure our array is properly ordered. */
- if (p > 0 && check_properly_ordered(ofs, p, direction))
- return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG),
- "%s data entry array not properly ordered at entry %" PRIu64,
- f->path, i);
-
- if (ret_offset)
- *ret_offset = ofs;
-
- return 1;
-}
-
-int journal_file_move_to_entry_by_offset_for_data(
- JournalFile *f,
- uint64_t data_offset,
- uint64_t p,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- int r;
- Object *d;
-
- assert(f);
-
- r = journal_file_move_to_object(f, OBJECT_DATA, data_offset, &d);
- if (r < 0)
- return r;
-
- return generic_array_bisect_plus_one(
- f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- le64toh(d->data.n_entries),
- p,
- test_object_offset,
- direction,
- ret, ret_offset, NULL);
-}
-
-int journal_file_move_to_entry_by_monotonic_for_data(
- JournalFile *f,
- uint64_t data_offset,
- sd_id128_t boot_id,
- uint64_t monotonic,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- Object *o, *d;
- int r;
- uint64_t b, z;
-
- assert(f);
-
- /* First, seek by time */
- r = find_data_object_by_boot_id(f, boot_id, &o, &b);
- if (r < 0)
- return r;
- if (r == 0)
- return -ENOENT;
-
- r = generic_array_bisect_plus_one(f,
- le64toh(o->data.entry_offset),
- le64toh(o->data.entry_array_offset),
- le64toh(o->data.n_entries),
- monotonic,
- test_object_monotonic,
- direction,
- NULL, &z, NULL);
- if (r <= 0)
- return r;
-
- /* And now, continue seeking until we find an entry that
- * exists in both bisection arrays */
-
- for (;;) {
- Object *qo;
- uint64_t p, q;
-
- r = journal_file_move_to_object(f, OBJECT_DATA, data_offset, &d);
- if (r < 0)
- return r;
-
- r = generic_array_bisect_plus_one(f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- le64toh(d->data.n_entries),
- z,
- test_object_offset,
- direction,
- NULL, &p, NULL);
- if (r <= 0)
- return r;
-
- r = journal_file_move_to_object(f, OBJECT_DATA, b, &o);
- if (r < 0)
- return r;
-
- r = generic_array_bisect_plus_one(f,
- le64toh(o->data.entry_offset),
- le64toh(o->data.entry_array_offset),
- le64toh(o->data.n_entries),
- p,
- test_object_offset,
- direction,
- &qo, &q, NULL);
-
- if (r <= 0)
- return r;
-
- if (p == q) {
- if (ret)
- *ret = qo;
- if (ret_offset)
- *ret_offset = q;
-
- return 1;
- }
-
- z = q;
- }
-}
-
-int journal_file_move_to_entry_by_seqnum_for_data(
- JournalFile *f,
- uint64_t data_offset,
- uint64_t seqnum,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- Object *d;
- int r;
-
- assert(f);
-
- r = journal_file_move_to_object(f, OBJECT_DATA, data_offset, &d);
- if (r < 0)
- return r;
-
- return generic_array_bisect_plus_one(
- f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- le64toh(d->data.n_entries),
- seqnum,
- test_object_seqnum,
- direction,
- ret, ret_offset, NULL);
-}
-
-int journal_file_move_to_entry_by_realtime_for_data(
- JournalFile *f,
- uint64_t data_offset,
- uint64_t realtime,
- direction_t direction,
- Object **ret, uint64_t *ret_offset) {
-
- Object *d;
- int r;
-
- assert(f);
-
- r = journal_file_move_to_object(f, OBJECT_DATA, data_offset, &d);
- if (r < 0)
- return r;
-
- return generic_array_bisect_plus_one(
- f,
- le64toh(d->data.entry_offset),
- le64toh(d->data.entry_array_offset),
- le64toh(d->data.n_entries),
- realtime,
- test_object_realtime,
- direction,
- ret, ret_offset, NULL);
-}
-
-void journal_file_dump(JournalFile *f) {
- Object *o;
- int r;
- uint64_t p;
-
- assert(f);
- assert(f->header);
-
- journal_file_print_header(f);
-
- p = le64toh(READ_NOW(f->header->header_size));
- while (p != 0) {
- r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &o);
- if (r < 0)
- goto fail;
-
- switch (o->object.type) {
-
- case OBJECT_UNUSED:
- printf("Type: OBJECT_UNUSED\n");
- break;
-
- case OBJECT_DATA:
- printf("Type: OBJECT_DATA\n");
- break;
-
- case OBJECT_FIELD:
- printf("Type: OBJECT_FIELD\n");
- break;
-
- case OBJECT_ENTRY:
- printf("Type: OBJECT_ENTRY seqnum=%"PRIu64" monotonic=%"PRIu64" realtime=%"PRIu64"\n",
- le64toh(o->entry.seqnum),
- le64toh(o->entry.monotonic),
- le64toh(o->entry.realtime));
- break;
-
- case OBJECT_FIELD_HASH_TABLE:
- printf("Type: OBJECT_FIELD_HASH_TABLE\n");
- break;
-
- case OBJECT_DATA_HASH_TABLE:
- printf("Type: OBJECT_DATA_HASH_TABLE\n");
- break;
-
- case OBJECT_ENTRY_ARRAY:
- printf("Type: OBJECT_ENTRY_ARRAY\n");
- break;
-
- case OBJECT_TAG:
- printf("Type: OBJECT_TAG seqnum=%"PRIu64" epoch=%"PRIu64"\n",
- le64toh(o->tag.seqnum),
- le64toh(o->tag.epoch));
- break;
-
- default:
- printf("Type: unknown (%i)\n", o->object.type);
- break;
- }
-
- if (o->object.flags & OBJECT_COMPRESSION_MASK)
- printf("Flags: %s\n",
- object_compressed_to_string(o->object.flags & OBJECT_COMPRESSION_MASK));
-
- if (p == le64toh(f->header->tail_object_offset))
- p = 0;
- else
- p += ALIGN64(le64toh(o->object.size));
- }
-
- return;
-fail:
- log_error("File corrupt");
-}
-
-static const char* format_timestamp_safe(char *buf, size_t l, usec_t t) {
- const char *x;
-
- x = format_timestamp(buf, l, t);
- if (x)
- return x;
- return " --- ";
-}
-
-void journal_file_print_header(JournalFile *f) {
- char a[SD_ID128_STRING_MAX], b[SD_ID128_STRING_MAX], c[SD_ID128_STRING_MAX], d[SD_ID128_STRING_MAX];
- char x[FORMAT_TIMESTAMP_MAX], y[FORMAT_TIMESTAMP_MAX], z[FORMAT_TIMESTAMP_MAX];
- struct stat st;
- char bytes[FORMAT_BYTES_MAX];
-
- assert(f);
- assert(f->header);
-
- printf("File path: %s\n"
- "File ID: %s\n"
- "Machine ID: %s\n"
- "Boot ID: %s\n"
- "Sequential number ID: %s\n"
- "State: %s\n"
- "Compatible flags:%s%s\n"
- "Incompatible flags:%s%s%s%s%s\n"
- "Header size: %"PRIu64"\n"
- "Arena size: %"PRIu64"\n"
- "Data hash table size: %"PRIu64"\n"
- "Field hash table size: %"PRIu64"\n"
- "Rotate suggested: %s\n"
- "Head sequential number: %"PRIu64" (%"PRIx64")\n"
- "Tail sequential number: %"PRIu64" (%"PRIx64")\n"
- "Head realtime timestamp: %s (%"PRIx64")\n"
- "Tail realtime timestamp: %s (%"PRIx64")\n"
- "Tail monotonic timestamp: %s (%"PRIx64")\n"
- "Objects: %"PRIu64"\n"
- "Entry objects: %"PRIu64"\n",
- f->path,
- sd_id128_to_string(f->header->file_id, a),
- sd_id128_to_string(f->header->machine_id, b),
- sd_id128_to_string(f->header->boot_id, c),
- sd_id128_to_string(f->header->seqnum_id, d),
- f->header->state == STATE_OFFLINE ? "OFFLINE" :
- f->header->state == STATE_ONLINE ? "ONLINE" :
- f->header->state == STATE_ARCHIVED ? "ARCHIVED" : "UNKNOWN",
- JOURNAL_HEADER_SEALED(f->header) ? " SEALED" : "",
- (le32toh(f->header->compatible_flags) & ~HEADER_COMPATIBLE_ANY) ? " ???" : "",
- JOURNAL_HEADER_COMPRESSED_XZ(f->header) ? " COMPRESSED-XZ" : "",
- JOURNAL_HEADER_COMPRESSED_LZ4(f->header) ? " COMPRESSED-LZ4" : "",
- JOURNAL_HEADER_COMPRESSED_ZSTD(f->header) ? " COMPRESSED-ZSTD" : "",
- JOURNAL_HEADER_KEYED_HASH(f->header) ? " KEYED-HASH" : "",
- (le32toh(f->header->incompatible_flags) & ~HEADER_INCOMPATIBLE_ANY) ? " ???" : "",
- le64toh(f->header->header_size),
- le64toh(f->header->arena_size),
- le64toh(f->header->data_hash_table_size) / sizeof(HashItem),
- le64toh(f->header->field_hash_table_size) / sizeof(HashItem),
- yes_no(journal_file_rotate_suggested(f, 0)),
- le64toh(f->header->head_entry_seqnum), le64toh(f->header->head_entry_seqnum),
- le64toh(f->header->tail_entry_seqnum), le64toh(f->header->tail_entry_seqnum),
- format_timestamp_safe(x, sizeof(x), le64toh(f->header->head_entry_realtime)), le64toh(f->header->head_entry_realtime),
- format_timestamp_safe(y, sizeof(y), le64toh(f->header->tail_entry_realtime)), le64toh(f->header->tail_entry_realtime),
- format_timespan(z, sizeof(z), le64toh(f->header->tail_entry_monotonic), USEC_PER_MSEC), le64toh(f->header->tail_entry_monotonic),
- le64toh(f->header->n_objects),
- le64toh(f->header->n_entries));
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_data))
- printf("Data objects: %"PRIu64"\n"
- "Data hash table fill: %.1f%%\n",
- le64toh(f->header->n_data),
- 100.0 * (double) le64toh(f->header->n_data) / ((double) (le64toh(f->header->data_hash_table_size) / sizeof(HashItem))));
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_fields))
- printf("Field objects: %"PRIu64"\n"
- "Field hash table fill: %.1f%%\n",
- le64toh(f->header->n_fields),
- 100.0 * (double) le64toh(f->header->n_fields) / ((double) (le64toh(f->header->field_hash_table_size) / sizeof(HashItem))));
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_tags))
- printf("Tag objects: %"PRIu64"\n",
- le64toh(f->header->n_tags));
- if (JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays))
- printf("Entry array objects: %"PRIu64"\n",
- le64toh(f->header->n_entry_arrays));
-
- if (JOURNAL_HEADER_CONTAINS(f->header, field_hash_chain_depth))
- printf("Deepest field hash chain: %" PRIu64"\n",
- f->header->field_hash_chain_depth);
-
- if (JOURNAL_HEADER_CONTAINS(f->header, data_hash_chain_depth))
- printf("Deepest data hash chain: %" PRIu64"\n",
- f->header->data_hash_chain_depth);
-
- if (fstat(f->fd, &st) >= 0)
- printf("Disk usage: %s\n", format_bytes(bytes, sizeof(bytes), (uint64_t) st.st_blocks * 512ULL));
-}
-
-static int journal_file_warn_btrfs(JournalFile *f) {
- unsigned attrs;
- int r;
-
- assert(f);
-
- /* Before we write anything, check if the COW logic is turned
- * off on btrfs. Given our write pattern that is quite
- * unfriendly to COW file systems this should greatly improve
- * performance on COW file systems, such as btrfs, at the
- * expense of data integrity features (which shouldn't be too
- * bad, given that we do our own checksumming). */
-
- r = btrfs_is_filesystem(f->fd);
- if (r < 0)
- return log_warning_errno(r, "Failed to determine if journal is on btrfs: %m");
- if (!r)
- return 0;
-
- r = read_attr_fd(f->fd, &attrs);
- if (r < 0)
- return log_warning_errno(r, "Failed to read file attributes: %m");
-
- if (attrs & FS_NOCOW_FL) {
- log_debug("Detected btrfs file system with copy-on-write disabled, all is good.");
- return 0;
- }
-
- log_notice("Creating journal file %s on a btrfs file system, and copy-on-write is enabled. "
- "This is likely to slow down journal access substantially, please consider turning "
- "off the copy-on-write file attribute on the journal directory, using chattr +C.", f->path);
-
- return 1;
-}
-
-int journal_file_open(
- int fd,
- const char *fname,
- int flags,
- mode_t mode,
- bool compress,
- uint64_t compress_threshold_bytes,
- bool seal,
- JournalMetrics *metrics,
- MMapCache *mmap_cache,
- Set *deferred_closes,
- JournalFile *template,
- JournalFile **ret) {
-
- bool newly_created = false;
- JournalFile *f;
- void *h;
- int r;
-
- assert(ret);
- assert(fd >= 0 || fname);
-
- if (!IN_SET((flags & O_ACCMODE), O_RDONLY, O_RDWR))
- return -EINVAL;
-
- if (fname && (flags & O_CREAT) && !endswith(fname, ".journal"))
- return -EINVAL;
-
- f = new(JournalFile, 1);
- if (!f)
- return -ENOMEM;
-
- *f = (JournalFile) {
- .fd = fd,
- .mode = mode,
-
- .flags = flags,
- .writable = (flags & O_ACCMODE) != O_RDONLY,
-
-#if HAVE_ZSTD
- .compress_zstd = compress,
-#elif HAVE_LZ4
- .compress_lz4 = compress,
-#elif HAVE_XZ
- .compress_xz = compress,
-#endif
- .compress_threshold_bytes = compress_threshold_bytes == (uint64_t) -1 ?
- DEFAULT_COMPRESS_THRESHOLD :
- MAX(MIN_COMPRESS_THRESHOLD, compress_threshold_bytes),
-#if HAVE_GCRYPT
- .seal = seal,
-#endif
- };
-
- /* We turn on keyed hashes by default, but provide an environment variable to turn them off, if
- * people really want that */
- r = getenv_bool("SYSTEMD_JOURNAL_KEYED_HASH");
- if (r < 0) {
- if (r != -ENXIO)
- log_debug_errno(r, "Failed to parse $SYSTEMD_JOURNAL_KEYED_HASH environment variable, ignoring.");
- f->keyed_hash = true;
- } else
- f->keyed_hash = r;
-
- if (DEBUG_LOGGING) {
- static int last_seal = -1, last_compress = -1, last_keyed_hash = -1;
- static uint64_t last_bytes = UINT64_MAX;
- char bytes[FORMAT_BYTES_MAX];
-
- if (last_seal != f->seal ||
- last_keyed_hash != f->keyed_hash ||
- last_compress != JOURNAL_FILE_COMPRESS(f) ||
- last_bytes != f->compress_threshold_bytes) {
-
- log_debug("Journal effective settings seal=%s keyed_hash=%s compress=%s compress_threshold_bytes=%s",
- yes_no(f->seal), yes_no(f->keyed_hash), yes_no(JOURNAL_FILE_COMPRESS(f)),
- format_bytes(bytes, sizeof bytes, f->compress_threshold_bytes));
- last_seal = f->seal;
- last_keyed_hash = f->keyed_hash;
- last_compress = JOURNAL_FILE_COMPRESS(f);
- last_bytes = f->compress_threshold_bytes;
- }
- }
-
- if (mmap_cache)
- f->mmap = mmap_cache_ref(mmap_cache);
- else {
- f->mmap = mmap_cache_new();
- if (!f->mmap) {
- r = -ENOMEM;
- goto fail;
- }
- }
-
- if (fname) {
- f->path = strdup(fname);
- if (!f->path) {
- r = -ENOMEM;
- goto fail;
- }
- } else {
- assert(fd >= 0);
-
- /* If we don't know the path, fill in something explanatory and vaguely useful */
- if (asprintf(&f->path, "/proc/self/%i", fd) < 0) {
- r = -ENOMEM;
- goto fail;
- }
- }
-
- f->chain_cache = ordered_hashmap_new(&uint64_hash_ops);
- if (!f->chain_cache) {
- r = -ENOMEM;
- goto fail;
- }
-
- if (f->fd < 0) {
- /* We pass O_NONBLOCK here, so that in case somebody pointed us to some character device node or FIFO
- * or so, we likely fail quickly than block for long. For regular files O_NONBLOCK has no effect, hence
- * it doesn't hurt in that case. */
-
- f->fd = open(f->path, f->flags|O_CLOEXEC|O_NONBLOCK, f->mode);
- if (f->fd < 0) {
- r = -errno;
- goto fail;
- }
-
- /* fds we opened here by us should also be closed by us. */
- f->close_fd = true;
-
- r = fd_nonblock(f->fd, false);
- if (r < 0)
- goto fail;
- }
-
- f->cache_fd = mmap_cache_add_fd(f->mmap, f->fd, prot_from_flags(flags));
- if (!f->cache_fd) {
- r = -ENOMEM;
- goto fail;
- }
-
- r = journal_file_fstat(f);
- if (r < 0)
- goto fail;
-
- if (f->last_stat.st_size == 0 && f->writable) {
-
- (void) journal_file_warn_btrfs(f);
-
- /* Let's attach the creation time to the journal file, so that the vacuuming code knows the age of this
- * file even if the file might end up corrupted one day... Ideally we'd just use the creation time many
- * file systems maintain for each file, but the API to query this is very new, hence let's emulate this
- * via extended attributes. If extended attributes are not supported we'll just skip this, and rely
- * solely on mtime/atime/ctime of the file. */
- (void) fd_setcrtime(f->fd, 0);
-
-#if HAVE_GCRYPT
- /* Try to load the FSPRG state, and if we can't, then
- * just don't do sealing */
- if (f->seal) {
- r = journal_file_fss_load(f);
- if (r < 0)
- f->seal = false;
- }
-#endif
-
- r = journal_file_init_header(f, template);
- if (r < 0)
- goto fail;
-
- r = journal_file_fstat(f);
- if (r < 0)
- goto fail;
-
- newly_created = true;
- }
-
- if (f->last_stat.st_size < (off_t) HEADER_SIZE_MIN) {
- r = -ENODATA;
- goto fail;
- }
-
- r = mmap_cache_get(f->mmap, f->cache_fd, CONTEXT_HEADER, true, 0, PAGE_ALIGN(sizeof(Header)), &f->last_stat, &h);
- if (r == -EINVAL) {
- /* Some file systems (jffs2 or p9fs) don't support mmap() properly (or only read-only
- * mmap()), and return EINVAL in that case. Let's propagate that as a more recognizable error
- * code. */
- r = -EAFNOSUPPORT;
- goto fail;
- }
- if (r < 0)
- goto fail;
-
- f->header = h;
-
- if (!newly_created) {
- set_clear_with_destructor(deferred_closes, journal_file_close);
-
- r = journal_file_verify_header(f);
- if (r < 0)
- goto fail;
- }
-
-#if HAVE_GCRYPT
- if (!newly_created && f->writable) {
- r = journal_file_fss_load(f);
- if (r < 0)
- goto fail;
- }
-#endif
-
- if (f->writable) {
- if (metrics) {
- journal_default_metrics(metrics, f->fd);
- f->metrics = *metrics;
- } else if (template)
- f->metrics = template->metrics;
-
- r = journal_file_refresh_header(f);
- if (r < 0)
- goto fail;
- }
-
-#if HAVE_GCRYPT
- r = journal_file_hmac_setup(f);
- if (r < 0)
- goto fail;
-#endif
-
- if (newly_created) {
- r = journal_file_setup_field_hash_table(f);
- if (r < 0)
- goto fail;
-
- r = journal_file_setup_data_hash_table(f);
- if (r < 0)
- goto fail;
-
-#if HAVE_GCRYPT
- r = journal_file_append_first_tag(f);
- if (r < 0)
- goto fail;
-#endif
- }
-
- if (mmap_cache_got_sigbus(f->mmap, f->cache_fd)) {
- r = -EIO;
- goto fail;
- }
-
- if (template && template->post_change_timer) {
- r = journal_file_enable_post_change_timer(
- f,
- sd_event_source_get_event(template->post_change_timer),
- template->post_change_timer_period);
-
- if (r < 0)
- goto fail;
- }
-
- /* The file is opened now successfully, thus we take possession of any passed in fd. */
- f->close_fd = true;
-
- *ret = f;
- return 0;
-
-fail:
- if (f->cache_fd && mmap_cache_got_sigbus(f->mmap, f->cache_fd))
- r = -EIO;
-
- (void) journal_file_close(f);
-
- return r;
-}
-
-int journal_file_archive(JournalFile *f) {
- _cleanup_free_ char *p = NULL;
-
- assert(f);
-
- if (!f->writable)
- return -EINVAL;
-
- /* Is this a journal file that was passed to us as fd? If so, we synthesized a path name for it, and we refuse
- * rotation, since we don't know the actual path, and couldn't rename the file hence. */
- if (path_startswith(f->path, "/proc/self/fd"))
- return -EINVAL;
-
- if (!endswith(f->path, ".journal"))
- return -EINVAL;
-
- if (asprintf(&p, "%.*s@" SD_ID128_FORMAT_STR "-%016"PRIx64"-%016"PRIx64".journal",
- (int) strlen(f->path) - 8, f->path,
- SD_ID128_FORMAT_VAL(f->header->seqnum_id),
- le64toh(f->header->head_entry_seqnum),
- le64toh(f->header->head_entry_realtime)) < 0)
- return -ENOMEM;
-
- /* Try to rename the file to the archived version. If the file already was deleted, we'll get ENOENT, let's
- * ignore that case. */
- if (rename(f->path, p) < 0 && errno != ENOENT)
- return -errno;
-
- /* Sync the rename to disk */
- (void) fsync_directory_of_file(f->fd);
-
- /* Set as archive so offlining commits w/state=STATE_ARCHIVED. Previously we would set old_file->header->state
- * to STATE_ARCHIVED directly here, but journal_file_set_offline() short-circuits when state != STATE_ONLINE,
- * which would result in the rotated journal never getting fsync() called before closing. Now we simply queue
- * the archive state by setting an archive bit, leaving the state as STATE_ONLINE so proper offlining
- * occurs. */
- f->archive = true;
-
- /* Currently, btrfs is not very good with out write patterns and fragments heavily. Let's defrag our journal
- * files when we archive them */
- f->defrag_on_close = true;
-
- return 0;
-}
-
-JournalFile* journal_initiate_close(
- JournalFile *f,
- Set *deferred_closes) {
-
- int r;
-
- assert(f);
-
- if (deferred_closes) {
-
- r = set_put(deferred_closes, f);
- if (r < 0)
- log_debug_errno(r, "Failed to add file to deferred close set, closing immediately.");
- else {
- (void) journal_file_set_offline(f, false);
- return NULL;
- }
- }
-
- return journal_file_close(f);
-}
-
-int journal_file_rotate(
- JournalFile **f,
- bool compress,
- uint64_t compress_threshold_bytes,
- bool seal,
- Set *deferred_closes) {
-
- JournalFile *new_file = NULL;
- int r;
-
- assert(f);
- assert(*f);
-
- r = journal_file_archive(*f);
- if (r < 0)
- return r;
-
- r = journal_file_open(
- -1,
- (*f)->path,
- (*f)->flags,
- (*f)->mode,
- compress,
- compress_threshold_bytes,
- seal,
- NULL, /* metrics */
- (*f)->mmap,
- deferred_closes,
- *f, /* template */
- &new_file);
-
- journal_initiate_close(*f, deferred_closes);
- *f = new_file;
-
- return r;
-}
-
-int journal_file_dispose(int dir_fd, const char *fname) {
- _cleanup_free_ char *p = NULL;
- _cleanup_close_ int fd = -1;
-
- assert(fname);
-
- /* Renames a journal file to *.journal~, i.e. to mark it as corrupted or otherwise uncleanly shutdown. Note that
- * this is done without looking into the file or changing any of its contents. The idea is that this is called
- * whenever something is suspicious and we want to move the file away and make clear that it is not accessed
- * for writing anymore. */
-
- if (!endswith(fname, ".journal"))
- return -EINVAL;
-
- if (asprintf(&p, "%.*s@%016" PRIx64 "-%016" PRIx64 ".journal~",
- (int) strlen(fname) - 8, fname,
- now(CLOCK_REALTIME),
- random_u64()) < 0)
- return -ENOMEM;
-
- if (renameat(dir_fd, fname, dir_fd, p) < 0)
- return -errno;
-
- /* btrfs doesn't cope well with our write pattern and fragments heavily. Let's defrag all files we rotate */
- fd = openat(dir_fd, p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fd < 0)
- log_debug_errno(errno, "Failed to open file for defragmentation/FS_NOCOW_FL, ignoring: %m");
- else {
- (void) chattr_fd(fd, 0, FS_NOCOW_FL, NULL);
- (void) btrfs_defrag_fd(fd);
- }
-
- return 0;
-}
-
-int journal_file_open_reliably(
- const char *fname,
- int flags,
- mode_t mode,
- bool compress,
- uint64_t compress_threshold_bytes,
- bool seal,
- JournalMetrics *metrics,
- MMapCache *mmap_cache,
- Set *deferred_closes,
- JournalFile *template,
- JournalFile **ret) {
-
- int r;
-
- r = journal_file_open(-1, fname, flags, mode, compress, compress_threshold_bytes, seal, metrics, mmap_cache,
- deferred_closes, template, ret);
- if (!IN_SET(r,
- -EBADMSG, /* Corrupted */
- -ENODATA, /* Truncated */
- -EHOSTDOWN, /* Other machine */
- -EPROTONOSUPPORT, /* Incompatible feature */
- -EBUSY, /* Unclean shutdown */
- -ESHUTDOWN, /* Already archived */
- -EIO, /* IO error, including SIGBUS on mmap */
- -EIDRM, /* File has been deleted */
- -ETXTBSY)) /* File is from the future */
- return r;
-
- if ((flags & O_ACCMODE) == O_RDONLY)
- return r;
-
- if (!(flags & O_CREAT))
- return r;
-
- if (!endswith(fname, ".journal"))
- return r;
-
- /* The file is corrupted. Rotate it away and try it again (but only once) */
- log_warning_errno(r, "File %s corrupted or uncleanly shut down, renaming and replacing.", fname);
-
- r = journal_file_dispose(AT_FDCWD, fname);
- if (r < 0)
- return r;
-
- return journal_file_open(-1, fname, flags, mode, compress, compress_threshold_bytes, seal, metrics, mmap_cache,
- deferred_closes, template, ret);
-}
-
-int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint64_t p) {
- uint64_t q, n, xor_hash = 0;
- const sd_id128_t *boot_id;
- dual_timestamp ts;
- EntryItem *items;
- int r;
-
- assert(from);
- assert(to);
- assert(o);
- assert(p);
-
- if (!to->writable)
- return -EPERM;
-
- ts.monotonic = le64toh(o->entry.monotonic);
- ts.realtime = le64toh(o->entry.realtime);
- boot_id = &o->entry.boot_id;
-
- n = journal_file_entry_n_items(o);
- /* alloca() can't take 0, hence let's allocate at least one */
- items = newa(EntryItem, MAX(1u, n));
-
- for (uint64_t i = 0; i < n; i++) {
- uint64_t l, h;
- le64_t le_hash;
- size_t t;
- void *data;
- Object *u;
-
- q = le64toh(o->entry.items[i].object_offset);
- le_hash = o->entry.items[i].hash;
-
- r = journal_file_move_to_object(from, OBJECT_DATA, q, &o);
- if (r < 0)
- return r;
-
- if (le_hash != o->data.hash)
- return -EBADMSG;
-
- l = le64toh(READ_NOW(o->object.size));
- if (l < offsetof(Object, data.payload))
- return -EBADMSG;
-
- l -= offsetof(Object, data.payload);
- t = (size_t) l;
-
- /* We hit the limit on 32bit machines */
- if ((uint64_t) t != l)
- return -E2BIG;
-
- if (o->object.flags & OBJECT_COMPRESSION_MASK) {
-#if HAVE_COMPRESSION
- size_t rsize = 0;
-
- r = decompress_blob(o->object.flags & OBJECT_COMPRESSION_MASK,
- o->data.payload, l, &from->compress_buffer, &from->compress_buffer_size, &rsize, 0);
- if (r < 0)
- return r;
-
- data = from->compress_buffer;
- l = rsize;
-#else
- return -EPROTONOSUPPORT;
-#endif
- } else
- data = o->data.payload;
-
- r = journal_file_append_data(to, data, l, &u, &h);
- if (r < 0)
- return r;
-
- if (JOURNAL_HEADER_KEYED_HASH(to->header))
- xor_hash ^= jenkins_hash64(data, l);
- else
- xor_hash ^= le64toh(u->data.hash);
-
- items[i].object_offset = htole64(h);
- items[i].hash = u->data.hash;
-
- r = journal_file_move_to_object(from, OBJECT_ENTRY, p, &o);
- if (r < 0)
- return r;
- }
-
- r = journal_file_append_entry_internal(to, &ts, boot_id, xor_hash, items, n,
- NULL, NULL, NULL);
-
- if (mmap_cache_got_sigbus(to->mmap, to->cache_fd))
- return -EIO;
-
- return r;
-}
-
-void journal_reset_metrics(JournalMetrics *m) {
- assert(m);
-
- /* Set everything to "pick automatic values". */
-
- *m = (JournalMetrics) {
- .min_use = (uint64_t) -1,
- .max_use = (uint64_t) -1,
- .min_size = (uint64_t) -1,
- .max_size = (uint64_t) -1,
- .keep_free = (uint64_t) -1,
- .n_max_files = (uint64_t) -1,
- };
-}
-
-void journal_default_metrics(JournalMetrics *m, int fd) {
- char a[FORMAT_BYTES_MAX], b[FORMAT_BYTES_MAX], c[FORMAT_BYTES_MAX], d[FORMAT_BYTES_MAX], e[FORMAT_BYTES_MAX];
- struct statvfs ss;
- uint64_t fs_size = 0;
-
- assert(m);
- assert(fd >= 0);
-
- if (fstatvfs(fd, &ss) >= 0)
- fs_size = ss.f_frsize * ss.f_blocks;
- else
- log_debug_errno(errno, "Failed to determine disk size: %m");
-
- if (m->max_use == (uint64_t) -1) {
-
- if (fs_size > 0)
- m->max_use = CLAMP(PAGE_ALIGN(fs_size / 10), /* 10% of file system size */
- MAX_USE_LOWER, MAX_USE_UPPER);
- else
- m->max_use = MAX_USE_LOWER;
- } else {
- m->max_use = PAGE_ALIGN(m->max_use);
-
- if (m->max_use != 0 && m->max_use < JOURNAL_FILE_SIZE_MIN*2)
- m->max_use = JOURNAL_FILE_SIZE_MIN*2;
- }
-
- if (m->min_use == (uint64_t) -1) {
- if (fs_size > 0)
- m->min_use = CLAMP(PAGE_ALIGN(fs_size / 50), /* 2% of file system size */
- MIN_USE_LOW, MIN_USE_HIGH);
- else
- m->min_use = MIN_USE_LOW;
- }
-
- if (m->min_use > m->max_use)
- m->min_use = m->max_use;
-
- if (m->max_size == (uint64_t) -1)
- m->max_size = MIN(PAGE_ALIGN(m->max_use / 8), /* 8 chunks */
- MAX_SIZE_UPPER);
- else
- m->max_size = PAGE_ALIGN(m->max_size);
-
- if (m->max_size != 0) {
- if (m->max_size < JOURNAL_FILE_SIZE_MIN)
- m->max_size = JOURNAL_FILE_SIZE_MIN;
-
- if (m->max_use != 0 && m->max_size*2 > m->max_use)
- m->max_use = m->max_size*2;
- }
-
- if (m->min_size == (uint64_t) -1)
- m->min_size = JOURNAL_FILE_SIZE_MIN;
- else
- m->min_size = CLAMP(PAGE_ALIGN(m->min_size),
- JOURNAL_FILE_SIZE_MIN,
- m->max_size ?: UINT64_MAX);
-
- if (m->keep_free == (uint64_t) -1) {
- if (fs_size > 0)
- m->keep_free = MIN(PAGE_ALIGN(fs_size / 20), /* 5% of file system size */
- KEEP_FREE_UPPER);
- else
- m->keep_free = DEFAULT_KEEP_FREE;
- }
-
- if (m->n_max_files == (uint64_t) -1)
- m->n_max_files = DEFAULT_N_MAX_FILES;
-
- log_debug("Fixed min_use=%s max_use=%s max_size=%s min_size=%s keep_free=%s n_max_files=%" PRIu64,
- format_bytes(a, sizeof(a), m->min_use),
- format_bytes(b, sizeof(b), m->max_use),
- format_bytes(c, sizeof(c), m->max_size),
- format_bytes(d, sizeof(d), m->min_size),
- format_bytes(e, sizeof(e), m->keep_free),
- m->n_max_files);
-}
-
-int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to) {
- assert(f);
- assert(f->header);
- assert(from || to);
-
- if (from) {
- if (f->header->head_entry_realtime == 0)
- return -ENOENT;
-
- *from = le64toh(f->header->head_entry_realtime);
- }
-
- if (to) {
- if (f->header->tail_entry_realtime == 0)
- return -ENOENT;
-
- *to = le64toh(f->header->tail_entry_realtime);
- }
-
- return 1;
-}
-
-int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot_id, usec_t *from, usec_t *to) {
- Object *o;
- uint64_t p;
- int r;
-
- assert(f);
- assert(from || to);
-
- r = find_data_object_by_boot_id(f, boot_id, &o, &p);
- if (r <= 0)
- return r;
-
- if (le64toh(o->data.n_entries) <= 0)
- return 0;
-
- if (from) {
- r = journal_file_move_to_object(f, OBJECT_ENTRY, le64toh(o->data.entry_offset), &o);
- if (r < 0)
- return r;
-
- *from = le64toh(o->entry.monotonic);
- }
-
- if (to) {
- r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
- if (r < 0)
- return r;
-
- r = generic_array_get_plus_one(f,
- le64toh(o->data.entry_offset),
- le64toh(o->data.entry_array_offset),
- le64toh(o->data.n_entries)-1,
- &o, NULL);
- if (r <= 0)
- return r;
-
- *to = le64toh(o->entry.monotonic);
- }
-
- return 1;
-}
-
-bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec) {
- assert(f);
- assert(f->header);
-
- /* If we gained new header fields we gained new features,
- * hence suggest a rotation */
- if (le64toh(f->header->header_size) < sizeof(Header)) {
- log_debug("%s uses an outdated header, suggesting rotation.", f->path);
- return true;
- }
-
- /* Let's check if the hash tables grew over a certain fill level (75%, borrowing this value from
- * Java's hash table implementation), and if so suggest a rotation. To calculate the fill level we
- * need the n_data field, which only exists in newer versions. */
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_data))
- if (le64toh(f->header->n_data) * 4ULL > (le64toh(f->header->data_hash_table_size) / sizeof(HashItem)) * 3ULL) {
- log_debug("Data hash table of %s has a fill level at %.1f (%"PRIu64" of %"PRIu64" items, %llu file size, %"PRIu64" bytes per hash table item), suggesting rotation.",
- f->path,
- 100.0 * (double) le64toh(f->header->n_data) / ((double) (le64toh(f->header->data_hash_table_size) / sizeof(HashItem))),
- le64toh(f->header->n_data),
- le64toh(f->header->data_hash_table_size) / sizeof(HashItem),
- (unsigned long long) f->last_stat.st_size,
- f->last_stat.st_size / le64toh(f->header->n_data));
- return true;
- }
-
- if (JOURNAL_HEADER_CONTAINS(f->header, n_fields))
- if (le64toh(f->header->n_fields) * 4ULL > (le64toh(f->header->field_hash_table_size) / sizeof(HashItem)) * 3ULL) {
- log_debug("Field hash table of %s has a fill level at %.1f (%"PRIu64" of %"PRIu64" items), suggesting rotation.",
- f->path,
- 100.0 * (double) le64toh(f->header->n_fields) / ((double) (le64toh(f->header->field_hash_table_size) / sizeof(HashItem))),
- le64toh(f->header->n_fields),
- le64toh(f->header->field_hash_table_size) / sizeof(HashItem));
- return true;
- }
-
- /* If there are too many hash collisions somebody is most likely playing games with us. Hence, if our
- * longest chain is longer than some threshold, let's suggest rotation. */
- if (JOURNAL_HEADER_CONTAINS(f->header, data_hash_chain_depth) &&
- le64toh(f->header->data_hash_chain_depth) > HASH_CHAIN_DEPTH_MAX) {
- log_debug("Data hash table of %s has deepest hash chain of length %" PRIu64 ", suggesting rotation.",
- f->path, le64toh(f->header->data_hash_chain_depth));
- return true;
- }
-
- if (JOURNAL_HEADER_CONTAINS(f->header, field_hash_chain_depth) &&
- le64toh(f->header->field_hash_chain_depth) > HASH_CHAIN_DEPTH_MAX) {
- log_debug("Field hash table of %s has deepest hash chain of length at %" PRIu64 ", suggesting rotation.",
- f->path, le64toh(f->header->field_hash_chain_depth));
- return true;
- }
-
- /* Are the data objects properly indexed by field objects? */
- if (JOURNAL_HEADER_CONTAINS(f->header, n_data) &&
- JOURNAL_HEADER_CONTAINS(f->header, n_fields) &&
- le64toh(f->header->n_data) > 0 &&
- le64toh(f->header->n_fields) == 0)
- return true;
-
- if (max_file_usec > 0) {
- usec_t t, h;
-
- h = le64toh(f->header->head_entry_realtime);
- t = now(CLOCK_REALTIME);
-
- if (h > 0 && t > h + max_file_usec)
- return true;
- }
-
- return false;
-}
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