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journal-file.c
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journal-file.c
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/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <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 "alloc-util.h"
#include "btrfs-util.h"
#include "chattr-util.h"
#include "compress.h"
#include "fd-util.h"
#include "journal-authenticate.h"
#include "journal-def.h"
#include "journal-file.h"
#include "lookup3.h"
#include "parse-util.h"
#include "path-util.h"
#include "random-util.h"
#include "sd-event.h"
#include "set.h"
#include "string-util.h"
#include "xattr-util.h"
#define DEFAULT_DATA_HASH_TABLE_SIZE (2047ULL*sizeof(HashItem))
#define DEFAULT_FIELD_HASH_TABLE_SIZE (333ULL*sizeof(HashItem))
#define COMPRESSION_SIZE_THRESHOLD (512ULL)
/* This is the minimum journal file size */
#define JOURNAL_FILE_SIZE_MIN (512ULL*1024ULL) /* 512 KiB */
/* These are the lower and upper bounds if we deduce the max_use value
* from the file system size */
#define DEFAULT_MAX_USE_LOWER (1ULL*1024ULL*1024ULL) /* 1 MiB */
#define DEFAULT_MAX_USE_UPPER (4ULL*1024ULL*1024ULL*1024ULL) /* 4 GiB */
/* This is the default minimal use limit, how much we'll use even if keep_free suggests otherwise. */
#define DEFAULT_MIN_USE (1ULL*1024ULL*1024ULL) /* 1 MiB */
/* This is the upper bound if we deduce max_size from max_use */
#define DEFAULT_MAX_SIZE_UPPER (128ULL*1024ULL*1024ULL) /* 128 MiB */
/* This is the upper bound if we deduce the keep_free value from the
* file system size */
#define DEFAULT_KEEP_FREE_UPPER (4ULL*1024ULL*1024ULL*1024ULL) /* 4 GiB */
/* This is the keep_free value when we can't determine the system
* size */
#define DEFAULT_KEEP_FREE (1024ULL*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 (8ULL*1024ULL*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
/* 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;
/* fall through */
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;
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->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 {
r = pthread_create(&f->offline_thread, NULL, journal_file_set_offline_thread, f);
if (r > 0) {
f->offline_state = OFFLINE_JOINED;
return -r;
}
}
return 0;
}
static int journal_file_set_online(JournalFile *f) {
bool joined = false;
assert(f);
if (!f->writable)
return -EPERM;
if (!(f->fd >= 0 && f->header))
return -EINVAL;
while (!joined) {
switch (f->offline_state) {
case OFFLINE_JOINED:
/* No offline thread, no need to wait. */
joined = true;
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. */
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. */
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. */
/* fall through to wait */
default: {
int r;
r = journal_file_set_offline_thread_join(f);
if (r < 0)
return r;
joined = true;
break;
}
}
}
if (mmap_cache_got_sigbus(f->mmap, f->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 (f->offline_state == OFFLINE_DONE ||
f->offline_state == OFFLINE_JOINED)
return false;
return true;
}
JournalFile* journal_file_close(JournalFile *f) {
assert(f);
#ifdef 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) {
int enabled;
if (sd_event_source_get_enabled(f->post_change_timer, &enabled) >= 0)
if (enabled == SD_EVENT_ONESHOT)
journal_file_post_change(f);
(void) sd_event_source_set_enabled(f->post_change_timer, SD_EVENT_OFF);
sd_event_source_unref(f->post_change_timer);
}
journal_file_set_offline(f, true);
if (f->mmap && f->fd >= 0)
mmap_cache_close_fd(f->mmap, f->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);
(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 defined(HAVE_XZ) || defined(HAVE_LZ4)
free(f->compress_buffer);
#endif
#ifdef 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);
}
void journal_file_close_set(Set *s) {
JournalFile *f;
assert(s);
while ((f = set_steal_first(s)))
(void) journal_file_close(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);
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 fsync_directory_of_file(int fd) {
_cleanup_free_ char *path = NULL, *dn = NULL;
_cleanup_close_ int dfd = -1;
struct stat st;
int r;
if (fstat(fd, &st) < 0)
return -errno;
if (!S_ISREG(st.st_mode))
return -EBADFD;
r = fd_get_path(fd, &path);
if (r < 0)
return r;
if (!path_is_absolute(path))
return -EINVAL;
dn = dirname_malloc(path);
if (!dn)
return -ENOMEM;
dfd = open(dn, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (dfd < 0)
return -errno;
if (fsync(dfd) < 0)
return -errno;
return 0;
}
static int journal_file_refresh_header(JournalFile *f) {
sd_id128_t boot_id;
int r;
assert(f);
assert(f->header);
r = sd_id128_get_machine(&f->header->machine_id);
if (r < 0)
return r;
r = sd_id128_get_boot(&boot_id);
if (r < 0)
return r;
if (sd_id128_equal(boot_id, f->header->boot_id))
f->tail_entry_monotonic_valid = true;
f->header->boot_id = boot_id;
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 int journal_file_verify_header(JournalFile *f) {
uint32_t flags;
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 */
flags = le32toh(f->header->incompatible_flags);
if (flags & ~HEADER_INCOMPATIBLE_SUPPORTED) {
if (flags & ~HEADER_INCOMPATIBLE_ANY)
log_debug("Journal file %s has unknown incompatible flags %"PRIx32,
f->path, flags & ~HEADER_INCOMPATIBLE_ANY);
flags = (flags & HEADER_INCOMPATIBLE_ANY) & ~HEADER_INCOMPATIBLE_SUPPORTED;
if (flags)
log_debug("Journal file %s uses incompatible flags %"PRIx32
" disabled at compilation time.", f->path, flags);
return -EPROTONOSUPPORT;
}
/* When open for writing we refuse to open files with
* compatible flags, too */
flags = le32toh(f->header->compatible_flags);
if (f->writable && (flags & ~HEADER_COMPATIBLE_SUPPORTED)) {
if (flags & ~HEADER_COMPATIBLE_ANY)
log_debug("Journal file %s has unknown compatible flags %"PRIx32,
f->path, flags & ~HEADER_COMPATIBLE_ANY);
flags = (flags & HEADER_COMPATIBLE_ANY) & ~HEADER_COMPATIBLE_SUPPORTED;
if (flags)
log_debug("Journal file %s uses compatible flags %"PRIx32
" disabled at compilation time.", f->path, flags);
return -EPROTONOSUPPORT;
}
if (f->header->state >= _STATE_MAX)
return -EBADMSG;
/* The first addition was n_data, so check that we are at least this large */
if (le64toh(f->header->header_size) < HEADER_SIZE_MIN)
return -EBADMSG;
if (JOURNAL_HEADER_SEALED(f->header) && !JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays))
return -EBADMSG;
if ((le64toh(f->header->header_size) + le64toh(f->header->arena_size)) > (uint64_t) f->last_stat.st_size)
return -ENODATA;
if (le64toh(f->header->tail_object_offset) > (le64toh(f->header->header_size) + le64toh(f->header->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_ONLINE) {
log_debug("Journal file %s is already online. Assuming unclean closing.", f->path);
return -EBUSY;
} else if (state == STATE_ARCHIVED)
return -ESHUTDOWN;
else if (state != STATE_OFFLINE) {
log_debug("Journal file %s has unknown state %i.", f->path, state);
return -EBUSY;
}
/* 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)) {
log_debug("Journal file %s is from the future, refusing to append new data to it that'd be older.", f->path);
return -ETXTBSY;
}
}
f->compress_xz = JOURNAL_HEADER_COMPRESSED_XZ(f->header);
f->compress_lz4 = JOURNAL_HEADER_COMPRESSED_LZ4(f->header);
f->seal = JOURNAL_HEADER_SEALED(f->header);
return 0;
}
static int journal_file_fstat(JournalFile *f) {
assert(f);
assert(f->fd >= 0);
if (fstat(f->fd, &f->last_stat) < 0)
return -errno;
f->last_stat_usec = now(CLOCK_MONOTONIC);
/* 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;
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 (mmap_cache_got_sigbus(f->mmap, f->fd))
return -EIO;
old_size =
le64toh(f->header->header_size) +
le64toh(f->header->arena_size);
new_size = PAGE_ALIGN(offset + size);
if (new_size < le64toh(f->header->header_size))
new_size = le64toh(f->header->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 = ((new_size+FILE_SIZE_INCREASE-1) / 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 - le64toh(f->header->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;
/* 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->fd, f->prot, 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];
}
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)) {
log_debug("Attempt to move to object at non-64bit boundary: %" PRIu64, offset);
return -EBADMSG;
}
/* Object may not be located in the file header */
if (offset < le64toh(f->header->header_size)) {
log_debug("Attempt to move to object located in file header: %" PRIu64, offset);
return -EBADMSG;
}
r = journal_file_move_to(f, type, false, offset, sizeof(ObjectHeader), &t);
if (r < 0)
return r;
o = (Object*) t;
s = le64toh(o->object.size);
if (s == 0) {
log_debug("Attempt to move to uninitialized object: %" PRIu64, offset);
return -EBADMSG;
}
if (s < sizeof(ObjectHeader)) {
log_debug("Attempt to move to overly short object: %" PRIu64, offset);
return -EBADMSG;
}
if (o->object.type <= OBJECT_UNUSED) {
log_debug("Attempt to move to object with invalid type: %" PRIu64, offset);
return -EBADMSG;
}
if (s < minimum_header_size(o)) {
log_debug("Attempt to move to truncated object: %" PRIu64, offset);
return -EBADMSG;
}
if (type > OBJECT_UNUSED && o->object.type != type) {
log_debug("Attempt to move to object of unexpected type: %" PRIu64, offset);
return -EBADMSG;
}
if (s > sizeof(ObjectHeader)) {
r = journal_file_move_to(f, type, false, offset, s, &t);
if (r < 0)
return r;
o = (Object*) t;
}
*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 *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));
assert(offset);
assert(ret);
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 {
r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &tail);
if (r < 0)
return r;
p += ALIGN64(le64toh(tail->object.size));
}
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;
zero(o->object);
o->object.type = type;
o->object.size = htole64(size);
f->header->tail_object_offset = htole64(p);
f->header->n_objects = htole64(le64toh(f->header->n_objects) + 1);
*ret = o;
*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 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;
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;
}