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Systemd/src/journal/journal-file.c
Lennart Poettering f27a386430 journald: whenever we rotate a file, btrfs defrag it 
Our write pattern is quite awful for CoW file systems (btrfs...), as we
keep updating file parts in the beginning of the file. This results in
fragmented journal files. Hence: when rotating files, defragment them,
since at that point we know that no further write accesses will be made.
2015-01-06 20:31:40 +01:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/mman.h>
#include <errno.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/statvfs.h>
#include <fcntl.h>
#include <stddef.h>
#include "btrfs-util.h"
#include "journal-def.h"
#include "journal-file.h"
#include "journal-authenticate.h"
#include "lookup3.h"
#include "compress.h"
#include "fsprg.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 (4ULL*1024ULL*1024ULL) /* 4 MiB */
/* 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 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 */
/* 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
static int journal_file_set_online(JournalFile *f) {
assert(f);
if (!f->writable)
return -EPERM;
if (!(f->fd >= 0 && f->header))
return -EINVAL;
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;
fsync(f->fd);
return 0;
default:
return -EINVAL;
}
}
int journal_file_set_offline(JournalFile *f) {
assert(f);
if (!f->writable)
return -EPERM;
if (!(f->fd >= 0 && f->header))
return -EINVAL;
if (f->header->state != STATE_ONLINE)
return 0;
fsync(f->fd);
if (mmap_cache_got_sigbus(f->mmap, f->fd))
return -EIO;
f->header->state = STATE_OFFLINE;
if (mmap_cache_got_sigbus(f->mmap, f->fd))
return -EIO;
fsync(f->fd);
return 0;
}
void journal_file_close(JournalFile *f) {
assert(f);
#ifdef HAVE_GCRYPT
/* Write the final tag */
if (f->seal && f->writable)
journal_file_append_tag(f);
#endif
journal_file_set_offline(f);
if (f->mmap && f->fd >= 0)
mmap_cache_close_fd(f->mmap, f->fd);
if (f->fd >= 0 && f->defrag_on_close)
btrfs_defrag_fd(f->fd);
safe_close(f->fd);
free(f->path);
if (f->mmap)
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 if (f->fsprg_state)
free(f->fsprg_state);
free(f->fsprg_seed);
if (f->hmac)
gcry_md_close(f->hmac);
#endif
free(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 journal_file_refresh_header(JournalFile *f) {
sd_id128_t boot_id;
int r;
assert(f);
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 */
fsync(f->fd);
return r;
}
static int journal_file_verify_header(JournalFile *f) {
uint32_t flags;
assert(f);
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) {
uint8_t state;
sd_id128_t machine_id;
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 %u.", f->path, state);
return -EBUSY;
}
}
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);
/* 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 = svfs.f_bfree * svfs.f_bsize;
if (available >= f->metrics.keep_free)
available -= f->metrics.keep_free;
else
available = 0;
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))
return -EFAULT;
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 < sizeof(ObjectHeader))
return -EBADMSG;
if (o->object.type <= OBJECT_UNUSED)
return -EBADMSG;
if (s < minimum_header_size(o))
return -EBADMSG;
if (type > OBJECT_UNUSED && o->object.type != type)
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);
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(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);
/* We estimate that we need 1 hash table entry per 768 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);
/* 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;
}
static int journal_file_map_data_hash_table(JournalFile *f) {
uint64_t s, p;
void *t;
int r;
assert(f);
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;
}
static int journal_file_map_field_hash_table(JournalFile *f) {
uint64_t s, p;
void *t;
int r;
assert(f);
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(o);
assert(offset > 0);
if (o->object.type != OBJECT_FIELD)
return -EINVAL;
m = le64toh(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(o);
assert(offset > 0);
if (o->object.type != OBJECT_DATA)
return -EINVAL;
m = le64toh(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;
}
int journal_file_find_field_object_with_hash(
JournalFile *f,
const void *field, uint64_t size, uint64_t hash,
Object **ret, uint64_t *offset) {
uint64_t p, osize, h, m;
int r;
assert(f);
assert(field && size > 0);
osize = offsetof(Object, field.payload) + size;
m = le64toh(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 (offset)
*offset = p;
return 1;
}
p = le64toh(o->field.next_hash_offset);
}
return 0;
}
int journal_file_find_field_object(
JournalFile *f,
const void *field, uint64_t size,
Object **ret, uint64_t *offset) {
uint64_t hash;
assert(f);
assert(field && size > 0);
hash = hash64(field, size);
return journal_file_find_field_object_with_hash(f,
field, size, hash,
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 *offset) {
uint64_t p, osize, h, m;
int r;
assert(f);
assert(data || size == 0);
osize = offsetof(Object, data.payload) + size;
m = le64toh(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 defined(HAVE_XZ) || defined(HAVE_LZ4)
uint64_t l;
size_t rsize;
l = le64toh(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 (offset)
*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 (offset)
*offset = p;
return 1;
}
next:
p = le64toh(o->data.next_hash_offset);
}
return 0;
}
int journal_file_find_data_object(
JournalFile *f,
const void *data, uint64_t size,
Object **ret, uint64_t *offset) {
uint64_t hash;
assert(f);
assert(data || size == 0);
hash = hash64(data, size);
return journal_file_find_data_object_with_hash(f,
data, size, hash,
ret, offset);
}
static int journal_file_append_field(
JournalFile *f,
const void *field, uint64_t size,
Object **ret, uint64_t *offset) {
uint64_t hash, p;
uint64_t osize;
Object *o;
int r;
assert(f);
assert(field && size > 0);
hash = hash64(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 (offset)
*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;
#ifdef HAVE_GCRYPT
r = journal_file_hmac_put_object(f, OBJECT_FIELD, o, p);
if (r < 0)
return r;
#endif
if (ret)
*ret = o;
if (offset)
*offset = p;
return 0;
}
static int journal_file_append_data(
JournalFile *f,
const void *data, uint64_t size,
Object **ret, uint64_t *offset) {
uint64_t hash, p;
uint64_t osize;
Object *o;
int r, compression = 0;
const void *eq;
assert(f);
assert(data || size == 0);
hash = hash64(data, size);
r = journal_file_find_data_object_with_hash(f, data, size, hash, &o, &p);
if (r < 0)
return r;
else if (r > 0) {
if (ret)
*ret = o;
if (offset)
*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 defined(HAVE_XZ) || defined(HAVE_LZ4)
if (f->compress_xz &&
size >= COMPRESSION_SIZE_THRESHOLD) {
size_t rsize;
compression = compress_blob(data, size, o->data.payload, &rsize);
if (compression) {
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));
}
}
#endif
if (!compression && size > 0)
memcpy(o->data.payload, data, size);
r = journal_file_link_data(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_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);
}
#ifdef HAVE_GCRYPT
r = journal_file_hmac_put_object(f, OBJECT_DATA, o, p);
if (r < 0)
return r;
#endif
if (ret)
*ret = o;
if (offset)
*offset = p;
return 0;
}
uint64_t journal_file_entry_n_items(Object *o) {
assert(o);
if (o->object.type != OBJECT_ENTRY)
return 0;
return (le64toh(o->object.size) - offsetof(Object, entry.items)) / sizeof(EntryItem);
}
uint64_t journal_file_entry_array_n_items(Object *o) {
assert(o);
if (o->object.type != OBJECT_ENTRY_ARRAY)
return 0;
return (le64toh(o->object.size) - offsetof(Object, entry_array.items)) / sizeof(uint64_t);
}
uint64_t journal_file_hash_table_n_items(Object *o) {
assert(o);
if (o->object.type != OBJECT_DATA_HASH_TABLE &&
o->object.type != OBJECT_FIELD_HASH_TABLE)
return 0;
return (le64toh(o->object.size) - 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(first);
assert(idx);
assert(p > 0);
a = le64toh(*first);
i = hidx = le64toh(*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;
#ifdef 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) {
int r;
assert(f);
assert(extra);
assert(first);
assert(idx);
assert(p > 0);
if (*idx == 0)
*extra = htole64(p);
else {
le64_t i;
i = htole64(le64toh(*idx) - 1);
r = link_entry_into_array(f, first, &i, p);
if (r < 0)
return r;
}
*idx = htole64(le64toh(*idx) + 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);
if (p == 0)
return -EINVAL;
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, i;
int r;
assert(f);
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;
f->tail_entry_monotonic_valid = true;
/* Link up the items */
n = journal_file_entry_n_items(o);
for (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,
uint64_t xor_hash,
const EntryItem items[], unsigned n_items,
uint64_t *seqnum,
Object **ret, uint64_t *offset) {
uint64_t np;
uint64_t osize;
Object *o;
int r;
assert(f);
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(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);
o->entry.boot_id = f->header->boot_id;
#ifdef 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 (offset)
*offset = np;
return 0;
}
void journal_file_post_change(JournalFile *f) {
assert(f);
/* 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_error_errno(errno, "Failed to truncate file to its own size: %m");
}
static int entry_item_cmp(const void *_a, const void *_b) {
const EntryItem *a = _a, *b = _b;
if (le64toh(a->object_offset) < le64toh(b->object_offset))
return -1;
if (le64toh(a->object_offset) > le64toh(b->object_offset))
return 1;
return 0;
}
int journal_file_append_entry(JournalFile *f, const dual_timestamp *ts, const struct iovec iovec[], unsigned n_iovec, uint64_t *seqnum, Object **ret, uint64_t *offset) {
unsigned i;
EntryItem *items;
int r;
uint64_t xor_hash = 0;
struct dual_timestamp _ts;
assert(f);
assert(iovec || n_iovec == 0);
if (!ts) {
dual_timestamp_get(&_ts);
ts = &_ts;
}
if (f->tail_entry_monotonic_valid &&
ts->monotonic < le64toh(f->header->tail_entry_monotonic))
return -EINVAL;
#ifdef 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 = alloca(sizeof(EntryItem) * MAX(1u, n_iovec));
for (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;
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. */
qsort_safe(items, n_iovec, sizeof(EntryItem), entry_item_cmp);
r = journal_file_append_entry_internal(f, ts, xor_hash, items, n_iovec, seqnum, 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->fd))
r = -EIO;
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 *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 (offset)
*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 *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 (offset)
*offset = extra;
return 1;
}
return generic_array_get(f, first, i-1, 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 *offset,
uint64_t *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) {
/* 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)
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) {
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)
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 = 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 (offset)
*offset = p;
if (idx)
*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 *offset,
uint64_t *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, offset, idx);
if (r == 0 && step_back)
goto found;
if (r > 0 && idx)
(*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 (offset)
*offset = extra;
if (idx)
*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) {
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;
if (le64toh(o->entry.seqnum) == needle)
return TEST_FOUND;
else if (le64toh(o->entry.seqnum) < 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 *offset) {
return generic_array_bisect(f,
le64toh(f->header->entry_array_offset),
le64toh(f->header->n_entries),
seqnum,
test_object_seqnum,
direction,
ret, offset, NULL);
}
static int test_object_realtime(JournalFile *f, uint64_t p, uint64_t needle) {
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;
if (le64toh(o->entry.realtime) == needle)
return TEST_FOUND;
else if (le64toh(o->entry.realtime) < 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 *offset) {
return generic_array_bisect(f,
le64toh(f->header->entry_array_offset),
le64toh(f->header->n_entries),
realtime,
test_object_realtime,
direction,
ret, offset, NULL);
}
static int test_object_monotonic(JournalFile *f, uint64_t p, uint64_t needle) {
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;
if (le64toh(o->entry.monotonic) == needle)
return TEST_FOUND;
else if (le64toh(o->entry.monotonic) < needle)
return TEST_LEFT;
else
return TEST_RIGHT;
}
static inline int find_data_object_by_boot_id(
JournalFile *f,
sd_id128_t boot_id,
Object **o,
uint64_t *b) {
char t[sizeof("_BOOT_ID=")-1 + 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 *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, 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, direction_t direction, Object *o, uint64_t offset) {
f->last_direction = direction;
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) {
assert(af);
assert(bf);
assert(af->location_type == LOCATION_SEEK);
assert(bf->location_type == LOCATION_SEEK);
/* If contents and timestamps match, these entries are
* identical, even if the seqnum does not match */
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)
return 0;
if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
/* If this is from the same seqnum source, compare
* seqnums */
if (af->current_seqnum < bf->current_seqnum)
return -1;
if (af->current_seqnum > bf->current_seqnum)
return 1;
/* 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 */
if (af->current_monotonic < bf->current_monotonic)
return -1;
if (af->current_monotonic > bf->current_monotonic)
return 1;
}
/* Otherwise, compare UTC time */
if (af->current_realtime < bf->current_realtime)
return -1;
if (af->current_realtime > bf->current_realtime)
return 1;
/* Finally, compare by contents */
if (af->current_xor_hash < bf->current_xor_hash)
return -1;
if (af->current_xor_hash > bf->current_xor_hash)
return 1;
return 0;
}
int journal_file_next_entry(
JournalFile *f,
uint64_t p,
direction_t direction,
Object **ret, uint64_t *offset) {
uint64_t i, n, ofs;
int r;
assert(f);
n = le64toh(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;
if (direction == DIRECTION_DOWN) {
if (i >= n - 1)
return 0;
i++;
} else {
if (i <= 0)
return 0;
i--;
}
}
/* And jump to it */
r = generic_array_get(f,
le64toh(f->header->entry_array_offset),
i,
ret, &ofs);
if (r <= 0)
return r;
if (p > 0 &&
(direction == DIRECTION_DOWN ? ofs <= p : ofs >= p)) {
log_debug("%s: entry array corrupted at entry %"PRIu64,
f->path, i);
return -EBADMSG;
}
if (offset)
*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 *offset) {
uint64_t n, i;
int r;
Object *d;
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(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;
if (direction == DIRECTION_DOWN) {
if (i >= n - 1)
return 0;
i++;
} else {
if (i <= 0)
return 0;
i--;
}
}
return generic_array_get_plus_one(f,
le64toh(d->data.entry_offset),
le64toh(d->data.entry_array_offset),
i,
ret, offset);
}
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 *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, 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 *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 (offset)
*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 *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, 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 *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, offset, NULL);
}
void journal_file_dump(JournalFile *f) {
Object *o;
int r;
uint64_t p;
assert(f);
journal_file_print_header(f);
p = le64toh(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 (%u)\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 = 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[33], b[33], c[33], d[33];
char x[FORMAT_TIMESTAMP_MAX], y[FORMAT_TIMESTAMP_MAX], z[FORMAT_TIMESTAMP_MAX];
struct stat st;
char bytes[FORMAT_BYTES_MAX];
assert(f);
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\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"\n"
"Tail Sequential Number: %"PRIu64"\n"
"Head Realtime Timestamp: %s\n"
"Tail Realtime Timestamp: %s\n"
"Tail Monotonic Timestamp: %s\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" : "",
(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->tail_entry_seqnum),
format_timestamp_safe(x, sizeof(x), le64toh(f->header->head_entry_realtime)),
format_timestamp_safe(y, sizeof(y), le64toh(f->header->tail_entry_realtime)),
format_timespan(z, sizeof(z), le64toh(f->header->tail_entry_monotonic), USEC_PER_MSEC),
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 (fstat(f->fd, &st) >= 0)
printf("Disk usage: %s\n", format_bytes(bytes, sizeof(bytes), (off_t) st.st_blocks * 512ULL));
}
int journal_file_open(
const char *fname,
int flags,
mode_t mode,
bool compress,
bool seal,
JournalMetrics *metrics,
MMapCache *mmap_cache,
JournalFile *template,
JournalFile **ret) {
bool newly_created = false;
JournalFile *f;
void *h;
int r;
assert(fname);
assert(ret);
if ((flags & O_ACCMODE) != O_RDONLY &&
(flags & O_ACCMODE) != O_RDWR)
return -EINVAL;
if (!endswith(fname, ".journal") &&
!endswith(fname, ".journal~"))
return -EINVAL;
f = new0(JournalFile, 1);
if (!f)
return -ENOMEM;
f->fd = -1;
f->mode = mode;
f->flags = flags;
f->prot = prot_from_flags(flags);
f->writable = (flags & O_ACCMODE) != O_RDONLY;
#if defined(HAVE_LZ4)
f->compress_lz4 = compress;
#elif defined(HAVE_XZ)
f->compress_xz = compress;
#endif
#ifdef HAVE_GCRYPT
f->seal = seal;
#endif
if (mmap_cache)
f->mmap = mmap_cache_ref(mmap_cache);
else {
f->mmap = mmap_cache_new();
if (!f->mmap) {
r = -ENOMEM;
goto fail;
}
}
f->path = strdup(fname);
if (!f->path) {
r = -ENOMEM;
goto fail;
}
f->chain_cache = ordered_hashmap_new(&uint64_hash_ops);
if (!f->chain_cache) {
r = -ENOMEM;
goto fail;
}
f->fd = open(f->path, f->flags|O_CLOEXEC, f->mode);
if (f->fd < 0) {
r = -errno;
goto fail;
}
r = journal_file_fstat(f);
if (r < 0)
goto fail;
if (f->last_stat.st_size == 0 && f->writable) {
/* 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 there is
* currently no usable API to query this, 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. */
fd_setcrtime(f->fd, now(CLOCK_REALTIME));
#ifdef 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 = -EIO;
goto fail;
}
r = mmap_cache_get(f->mmap, f->fd, f->prot, CONTEXT_HEADER, true, 0, PAGE_ALIGN(sizeof(Header)), &f->last_stat, &h);
if (r < 0) {
r = -errno;
goto fail;
}
f->header = h;
if (!newly_created) {
r = journal_file_verify_header(f);
if (r < 0)
goto fail;
}
#ifdef 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;
}
#ifdef 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;
#ifdef HAVE_GCRYPT
r = journal_file_append_first_tag(f);
if (r < 0)
goto fail;
#endif
}
r = journal_file_map_field_hash_table(f);
if (r < 0)
goto fail;
r = journal_file_map_data_hash_table(f);
if (r < 0)
goto fail;
if (mmap_cache_got_sigbus(f->mmap, f->fd)) {
r = -EIO;
goto fail;
}
*ret = f;
return 0;
fail:
if (f->fd >= 0 && mmap_cache_got_sigbus(f->mmap, f->fd))
r = -EIO;
journal_file_close(f);
return r;
}
int journal_file_rotate(JournalFile **f, bool compress, bool seal) {
_cleanup_free_ char *p = NULL;
size_t l;
JournalFile *old_file, *new_file = NULL;
int r;
assert(f);
assert(*f);
old_file = *f;
if (!old_file->writable)
return -EINVAL;
if (!endswith(old_file->path, ".journal"))
return -EINVAL;
l = strlen(old_file->path);
r = asprintf(&p, "%.*s@" SD_ID128_FORMAT_STR "-%016"PRIx64"-%016"PRIx64".journal",
(int) l - 8, old_file->path,
SD_ID128_FORMAT_VAL(old_file->header->seqnum_id),
le64toh((*f)->header->head_entry_seqnum),
le64toh((*f)->header->head_entry_realtime));
if (r < 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. */
r = rename(old_file->path, p);
if (r < 0 && errno != ENOENT)
return -errno;
old_file->header->state = STATE_ARCHIVED;
/* Currently, btrfs is not very good with out write patterns
* and fragments heavily. Let's defrag our journal files when
* we archive them */
old_file->defrag_on_close = true;
r = journal_file_open(old_file->path, old_file->flags, old_file->mode, compress, seal, NULL, old_file->mmap, old_file, &new_file);
journal_file_close(old_file);
*f = new_file;
return r;
}
int journal_file_open_reliably(
const char *fname,
int flags,
mode_t mode,
bool compress,
bool seal,
JournalMetrics *metrics,
MMapCache *mmap_cache,
JournalFile *template,
JournalFile **ret) {
int r;
size_t l;
_cleanup_free_ char *p = NULL;
r = journal_file_open(fname, flags, mode, compress, seal,
metrics, mmap_cache, template, ret);
if (r != -EBADMSG && /* corrupted */
r != -ENODATA && /* truncated */
r != -EHOSTDOWN && /* other machine */
r != -EPROTONOSUPPORT && /* incompatible feature */
r != -EBUSY && /* unclean shutdown */
r != -ESHUTDOWN && /* already archived */
r != -EIO /* IO error, including SIGBUS on mmap */)
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) */
l = strlen(fname);
if (asprintf(&p, "%.*s@%016llx-%016" PRIx64 ".journal~",
(int) l - 8, fname,
(unsigned long long) now(CLOCK_REALTIME),
random_u64()) < 0)
return -ENOMEM;
r = rename(fname, p);
if (r < 0)
return -errno;
/* btrfs doesn't cope well with our write pattern and
* fragments heavily. Let's defrag all files we rotate */
(void) btrfs_defrag(p);
log_warning("File %s corrupted or uncleanly shut down, renaming and replacing.", fname);
return journal_file_open(fname, flags, mode, compress, seal,
metrics, mmap_cache, template, ret);
}
int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint64_t p, uint64_t *seqnum, Object **ret, uint64_t *offset) {
uint64_t i, n;
uint64_t q, xor_hash = 0;
int r;
EntryItem *items;
dual_timestamp ts;
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);
n = journal_file_entry_n_items(o);
/* alloca() can't take 0, hence let's allocate at least one */
items = alloca(sizeof(EntryItem) * MAX(1u, n));
for (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(o->object.size) - 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 defined(HAVE_XZ) || defined(HAVE_LZ4)
size_t rsize;
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;
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, xor_hash, items, n, seqnum, ret, offset);
if (mmap_cache_got_sigbus(to->mmap, to->fd))
return -EIO;
return r;
}
void journal_default_metrics(JournalMetrics *m, int fd) {
uint64_t fs_size = 0;
struct statvfs ss;
char a[FORMAT_BYTES_MAX], b[FORMAT_BYTES_MAX], c[FORMAT_BYTES_MAX], d[FORMAT_BYTES_MAX];
assert(m);
assert(fd >= 0);
if (fstatvfs(fd, &ss) >= 0)
fs_size = ss.f_frsize * ss.f_blocks;
if (m->max_use == (uint64_t) -1) {
if (fs_size > 0) {
m->max_use = PAGE_ALIGN(fs_size / 10); /* 10% of file system size */
if (m->max_use > DEFAULT_MAX_USE_UPPER)
m->max_use = DEFAULT_MAX_USE_UPPER;
if (m->max_use < DEFAULT_MAX_USE_LOWER)
m->max_use = DEFAULT_MAX_USE_LOWER;
} else
m->max_use = DEFAULT_MAX_USE_LOWER;
} else {
m->max_use = PAGE_ALIGN(m->max_use);
if (m->max_use < JOURNAL_FILE_SIZE_MIN*2)
m->max_use = JOURNAL_FILE_SIZE_MIN*2;
}
if (m->max_size == (uint64_t) -1) {
m->max_size = PAGE_ALIGN(m->max_use / 8); /* 8 chunks */
if (m->max_size > DEFAULT_MAX_SIZE_UPPER)
m->max_size = DEFAULT_MAX_SIZE_UPPER;
} else
m->max_size = PAGE_ALIGN(m->max_size);
if (m->max_size < JOURNAL_FILE_SIZE_MIN)
m->max_size = JOURNAL_FILE_SIZE_MIN;
if (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 = PAGE_ALIGN(m->min_size);
if (m->min_size < JOURNAL_FILE_SIZE_MIN)
m->min_size = JOURNAL_FILE_SIZE_MIN;
if (m->min_size > m->max_size)
m->max_size = m->min_size;
}
if (m->keep_free == (uint64_t) -1) {
if (fs_size > 0) {
m->keep_free = PAGE_ALIGN(fs_size * 3 / 20); /* 15% of file system size */
if (m->keep_free > DEFAULT_KEEP_FREE_UPPER)
m->keep_free = DEFAULT_KEEP_FREE_UPPER;
} else
m->keep_free = DEFAULT_KEEP_FREE;
}
log_debug("Fixed max_use=%s max_size=%s min_size=%s keep_free=%s",
format_bytes(a, sizeof(a), m->max_use),
format_bytes(b, sizeof(b), m->max_size),
format_bytes(c, sizeof(c), m->min_size),
format_bytes(d, sizeof(d), m->keep_free));
}
int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to) {
assert(f);
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);
/* 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;
}
/* 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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