#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 "journal-def.h"

#include "journal-file.h"

#include "lookup3.h"

#define DEFAULT_ARENA_MAX_SIZE (16ULL*1024ULL*1024ULL*1024ULL)

#define DEFAULT_ARENA_MIN_SIZE (256ULL*1024ULL)

#define DEFAULT_ARENA_KEEP_FREE (1ULL*1024ULL*1024ULL)

#define DEFAULT_HASH_TABLE_SIZE (2047ULL*16ULL)

#define DEFAULT_BISECT_TABLE_SIZE ((DEFAULT_ARENA_MAX_SIZE/(64ULL*1024ULL))*8ULL)

#define DEFAULT_WINDOW_SIZE (128ULL*1024ULL*1024ULL)

static const char signature[] = { 'L', 'P', 'K', 'S', 'H', 'H', 'R', 'H' };

#define ALIGN64(x) (((x) + 7ULL) & ~7ULL)

void journal_file_close(JournalFile *f) {

assert(f);

if (f->fd >= 0)

close_nointr_nofail(f->fd);

if (f->header)

munmap(f->header, PAGE_ALIGN(sizeof(Header)));

if (f->hash_table_window)

munmap(f->hash_table_window, f->hash_table_window_size);

if (f->bisect_table_window)

munmap(f->bisect_table_window, f->bisect_table_window_size);

if (f->window)

munmap(f->window, f->window_size);

free(f->path);

free(f);

}

static int journal_file_init_header(JournalFile *f) {

Header h;

ssize_t k;

int r;

assert(f);

zero(h);

memcpy(h.signature, signature, 8);

h.arena_offset = htole64(ALIGN64(sizeof(h)));

h.arena_max_size = htole64(DEFAULT_ARENA_MAX_SIZE);

h.arena_min_size = htole64(DEFAULT_ARENA_MIN_SIZE);

h.arena_keep_free = htole64(DEFAULT_ARENA_KEEP_FREE);

r = sd_id128_randomize(&h.file_id);

if (r < 0)

return r;

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);

r = sd_id128_get_machine(&f->header->machine_id);

if (r < 0)

return r;

r = sd_id128_get_boot(&f->header->boot_id);

if (r < 0)

return r;

f->header->state = htole32(STATE_ONLINE);

return 0;

}

static int journal_file_verify_header(JournalFile *f) {

assert(f);

if (memcmp(f->header, signature, 8))

return -EBADMSG;

if (f->header->incompatible_flags != 0)

return -EPROTONOSUPPORT;

if ((uint64_t) f->last_stat.st_size < (le64toh(f->header->arena_offset) + le64toh(f->header->arena_size)))

return -ENODATA;

if (f->writable) {

uint32_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 = le32toh(f->header->state);

if (state == STATE_ONLINE)

log_debug("Journal file %s is already online. Assuming unclean closing. Ignoring.", f->path);

else if (state == STATE_ARCHIVED)

return -ESHUTDOWN;

else if (state != STATE_OFFLINE)

log_debug("Journal file %s has unknown state %u. Ignoring.", f->path, state);

}

return 0;

}

static int journal_file_allocate(JournalFile *f, uint64_t offset, uint64_t size) {

uint64_t asize;

uint64_t old_size, new_size;

assert(f);

if (offset < le64toh(f->header->arena_offset))

return -EINVAL;

new_size = PAGE_ALIGN(offset + size);

/* We assume that this file is not sparse, and we know that

old_size =

le64toh(f->header->arena_offset) +

le64toh(f->header->arena_size);

if (old_size >= new_size)

return 0;

asize = new_size - le64toh(f->header->arena_offset);

if (asize > le64toh(f->header->arena_min_size)) {

struct statvfs svfs;

if (fstatvfs(f->fd, &svfs) >= 0) {

uint64_t available;

available = svfs.f_bfree * svfs.f_bsize;

if (available >= f->header->arena_keep_free)

available -= f->header->arena_keep_free;

else

available = 0;

if (new_size - old_size > available)

return -E2BIG;

}

}

if (asize > le64toh(f->header->arena_max_size))

return -E2BIG;

if (posix_fallocate(f->fd, 0, new_size) < 0)

return -errno;

if (fstat(f->fd, &f->last_stat) < 0)

return -errno;

f->header->arena_size = htole64(asize);

return 0;

}

static int journal_file_map(

JournalFile *f,

uint64_t offset,

uint64_t size,

void **_window,

uint64_t *_woffset,

uint64_t *_wsize,

void **ret) {

uint64_t woffset, wsize;

void *window;

assert(f);

assert(size > 0);

assert(ret);

woffset = offset & ~((uint64_t) page_size() - 1ULL);

wsize = size + (offset - woffset);

wsize = PAGE_ALIGN(wsize);

window = mmap(NULL, wsize, f->prot, MAP_SHARED, f->fd, woffset);

if (window == MAP_FAILED)

return -errno;

if (_window)

*_window = window;

if (_woffset)

*_woffset = woffset;

if (_wsize)

*_wsize = wsize;

*ret = (uint8_t*) window + (offset - woffset);

return 0;

}

static int journal_file_move_to(JournalFile *f, uint64_t offset, uint64_t size, void **ret) {

void *p;

uint64_t delta;

int r;

assert(f);

assert(ret);

if (_likely_(f->window &&

f->window_offset <= offset &&

f->window_offset+f->window_size >= offset + size)) {

*ret = (uint8_t*) f->window + (offset - f->window_offset);

return 0;

}

if (f->window) {

if (munmap(f->window, f->window_size) < 0)

return -errno;

f->window = NULL;

f->window_size = f->window_offset = 0;

}

if (size < DEFAULT_WINDOW_SIZE) {

/* If the default window size is larger then what was

delta = PAGE_ALIGN((DEFAULT_WINDOW_SIZE - size) / 2);

if (offset < delta)

delta = offset;

offset -= delta;

size += (DEFAULT_WINDOW_SIZE - delta);

} else

delta = 0;

r = journal_file_map(f,

offset, size,

&f->window, &f->window_offset, &f->window_size,

& p);

if (r < 0)

return r;

*ret = (uint8_t*) p + delta;

return 0;

}

static bool verify_hash(Object *o) {

uint64_t t;

assert(o);

t = le64toh(o->object.type);

if (t == OBJECT_DATA) {

uint64_t s, h1, h2;

s = le64toh(o->object.size);

h1 = le64toh(o->data.hash);

h2 = hash64(o->data.payload, s - offsetof(Object, data.payload));

return h1 == h2;

}

return true;

}

int journal_file_move_to_object(JournalFile *f, uint64_t offset, int type, Object **ret) {

int r;

void *t;

Object *o;

uint64_t s;

assert(f);

assert(ret);

r = journal_file_move_to(f, offset, sizeof(ObjectHeader), &t);

if (r < 0)

return r;

o = (Object*) t;

s = le64toh(o->object.size);

if (s < sizeof(ObjectHeader))

return -EBADMSG;

if (type >= 0 && le64toh(o->object.type) != type)

return -EBADMSG;

if (s > sizeof(ObjectHeader)) {

r = journal_file_move_to(f, offset, s, &t);

if (r < 0)

return r;

o = (Object*) t;

}

if (!verify_hash(o))

return -EBADMSG;

*ret = o;

return 0;

}

static uint64_t journal_file_seqnum(JournalFile *f) {

uint64_t r;

assert(f);

r = le64toh(f->header->seqnum) + 1;

f->header->seqnum = htole64(r);

return r;

}

static int journal_file_append_object(JournalFile *f, uint64_t size, Object **ret, uint64_t *offset) {

int r;

uint64_t p;

Object *tail, *o;

void *t;

assert(f);

assert(size >= sizeof(ObjectHeader));

assert(offset);

assert(ret);

p = le64toh(f->header->tail_object_offset);

if (p == 0)

p = le64toh(f->header->arena_offset);

else {

r = journal_file_move_to_object(f, p, -1, &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, p, size, &t);

if (r < 0)

return r;

o = (Object*) t;

zero(o->object);

o->object.type = htole64(OBJECT_UNUSED);

zero(o->object.reserved);

o->object.size = htole64(size);

f->header->tail_object_offset = htole64(p);

if (f->header->head_object_offset == 0)

f->header->head_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_hash_table(JournalFile *f) {

uint64_t s, p;

Object *o;

int r;

assert(f);

s = DEFAULT_HASH_TABLE_SIZE;

r = journal_file_append_object(f, offsetof(Object, hash_table.table) + s, &o, &p);

if (r < 0)

return r;

o->object.type = htole64(OBJECT_HASH_TABLE);

memset(o->hash_table.table, 0, s);

f->header->hash_table_offset = htole64(p + offsetof(Object, hash_table.table));

f->header->hash_table_size = htole64(s);

return 0;

}

static int journal_file_setup_bisect_table(JournalFile *f) {

uint64_t s, p;

Object *o;

int r;

assert(f);

s = DEFAULT_BISECT_TABLE_SIZE;

r = journal_file_append_object(f, offsetof(Object, bisect_table.table) + s, &o, &p);

if (r < 0)

return r;

o->object.type = htole64(OBJECT_BISECT_TABLE);

memset(o->bisect_table.table, 0, s);

f->header->bisect_table_offset = htole64(p + offsetof(Object, bisect_table.table));

f->header->bisect_table_size = htole64(s);

return 0;

}

static int journal_file_map_hash_table(JournalFile *f) {

uint64_t s, p;

void *t;

int r;

assert(f);

p = le64toh(f->header->hash_table_offset);

s = le64toh(f->header->hash_table_size);

r = journal_file_map(f,

p, s,

&f->hash_table_window, NULL, &f->hash_table_window_size,

&t);

if (r < 0)

return r;

f->hash_table = t;

return 0;

}

static int journal_file_map_bisect_table(JournalFile *f) {

uint64_t s, p;

void *t;

int r;

assert(f);

p = le64toh(f->header->bisect_table_offset);

s = le64toh(f->header->bisect_table_size);

r = journal_file_map(f,

p, s,

&f->bisect_table_window, NULL, &f->bisect_table_window_size,

&t);

if (r < 0)

return r;

f->bisect_table = t;

return 0;

}

static int journal_file_link_data(JournalFile *f, Object *o, uint64_t offset, uint64_t hash_index) {

uint64_t p;

int r;

assert(f);

assert(o);

assert(offset > 0);

assert(o->object.type == htole64(OBJECT_DATA));

o->data.head_entry_offset = o->data.tail_entry_offset = 0;

o->data.next_hash_offset = 0;

p = le64toh(f->hash_table[hash_index].tail_hash_offset);

if (p == 0) {

/* Only entry in the hash table is easy */

o->data.prev_hash_offset = 0;

f->hash_table[hash_index].head_hash_offset = htole64(offset);

} else {

o->data.prev_hash_offset = htole64(p);

/* Temporarily move back to the previous data object,

r = journal_file_move_to_object(f, p, OBJECT_DATA, &o);

if (r < 0)

return r;

o->data.next_hash_offset = offset;

r = journal_file_move_to_object(f, offset, OBJECT_DATA, &o);

if (r < 0)

return r;

}

f->hash_table[hash_index].tail_hash_offset = htole64(offset);

return 0;

}

static int journal_file_append_data(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset) {

uint64_t hash, h, p, np;

uint64_t osize;

Object *o;

int r;

assert(f);

assert(data || size == 0);

osize = offsetof(Object, data.payload) + size;

hash = hash64(data, size);

h = hash % (le64toh(f->header->hash_table_size) / sizeof(HashItem));

p = le64toh(f->hash_table[h].head_hash_offset);

while (p != 0) {

/* Look for this data object in the hash table */

r = journal_file_move_to_object(f, p, OBJECT_DATA, &o);

if (r < 0)

return r;

if (le64toh(o->object.size) == osize &&

memcmp(o->data.payload, data, size) == 0) {

if (le64toh(o->data.hash) != hash)

return -EBADMSG;

if (ret)

*ret = o;

if (offset)

*offset = p;

return 0;

}

p = le64toh(o->data.next_hash_offset);

}

r = journal_file_append_object(f, osize, &o, &np);

if (r < 0)

return r;

o->object.type = htole64(OBJECT_DATA);

o->data.hash = htole64(hash);

memcpy(o->data.payload, data, size);

r = journal_file_link_data(f, o, np, h);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = np;

return 0;

}

uint64_t journal_file_entry_n_items(Object *o) {

assert(o);

assert(o->object.type == htole64(OBJECT_ENTRY));

return (le64toh(o->object.size) - offsetof(Object, entry.items)) / sizeof(EntryItem);

}

static int journal_file_link_entry_item(JournalFile *f, Object *o, uint64_t offset, uint64_t i) {

uint64_t p, q;

int r;

assert(f);

assert(o);

assert(offset > 0);

p = le64toh(o->entry.items[i].object_offset);

if (p == 0)

return -EINVAL;

o->entry.items[i].next_entry_offset = 0;

/* Move to the data object */

r = journal_file_move_to_object(f, p, OBJECT_DATA, &o);

if (r < 0)

return r;

q = le64toh(o->data.tail_entry_offset);

o->data.tail_entry_offset = htole64(offset);

if (q == 0)

o->data.head_entry_offset = htole64(offset);

else {

uint64_t n, j;

/* Move to previous entry */

r = journal_file_move_to_object(f, q, OBJECT_ENTRY, &o);

if (r < 0)

return r;

n = journal_file_entry_n_items(o);

for (j = 0; j < n; j++)

if (le64toh(o->entry.items[j].object_offset) == p)

break;

if (j >= n)

return -EBADMSG;

o->entry.items[j].next_entry_offset = offset;

}

/* Move back to original entry */

r = journal_file_move_to_object(f, offset, OBJECT_ENTRY, &o);

if (r < 0)

return r;

o->entry.items[i].prev_entry_offset = q;

return 0;

}

static int journal_file_link_entry(JournalFile *f, Object *o, uint64_t offset) {

uint64_t p, i, n, k, a, b;

int r;

assert(f);

assert(o);

assert(offset > 0);

assert(o->object.type == htole64(OBJECT_ENTRY));

/* Link up the entry itself */

p = le64toh(f->header->tail_entry_offset);

o->entry.prev_entry_offset = f->header->tail_entry_offset;

o->entry.next_entry_offset = 0;

if (p == 0)

f->header->head_entry_offset = htole64(offset);

else {

/* Temporarily move back to the previous entry, to

r = journal_file_move_to_object(f, p, OBJECT_ENTRY, &o);

if (r < 0)

return r;

o->entry.next_entry_offset = htole64(offset);

r = journal_file_move_to_object(f, offset, OBJECT_ENTRY, &o);

if (r < 0)

return r;

}

f->header->tail_entry_offset = htole64(offset);

/* 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;

}

/* Link up the entry in the bisect table */

n = le64toh(f->header->bisect_table_size) / sizeof(uint64_t);

k = le64toh(f->header->arena_max_size) / n;

a = (le64toh(f->header->last_bisect_offset) + k - 1) / k;

b = offset / k;

for (; a <= b; a++)

f->bisect_table[a] = htole64(offset);

f->header->last_bisect_offset = htole64(offset + le64toh(o->object.size));

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,

Object **ret, uint64_t *offset) {

uint64_t np;

uint64_t osize;

Object *o;

int r;

assert(f);

assert(items || n_items == 0);

osize = offsetof(Object, entry.items) + (n_items * sizeof(EntryItem));

r = journal_file_append_object(f, osize, &o, &np);

if (r < 0)

return r;

o->object.type = htole64(OBJECT_ENTRY);

o->entry.seqnum = htole64(journal_file_seqnum(f));

memcpy(o->entry.items, items, n_items * sizeof(EntryItem));

o->entry.realtime = ts ? htole64(ts->realtime) : 0;

o->entry.monotonic = ts ? htole64(ts->monotonic) : 0;

o->entry.xor_hash = htole64(xor_hash);

o->entry.boot_id = f->header->boot_id;

r = journal_file_link_entry(f, o, np);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = np;

return 0;

}

int journal_file_append_entry(JournalFile *f, const dual_timestamp *ts, const struct iovec iovec[], unsigned n_iovec, Object **ret, uint64_t *offset) {

unsigned i;

EntryItem *items;

int r;

uint64_t xor_hash = 0;

assert(f);

assert(iovec || n_iovec == 0);

items = new(EntryItem, n_iovec);

if (!items)

return -ENOMEM;

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)

goto finish;

xor_hash ^= le64toh(o->data.hash);

items[i].object_offset = htole64(p);

}

r = journal_file_append_entry_internal(f, ts, xor_hash, items, n_iovec, ret, offset);

finish:

free(items);

return r;

}

int journal_file_move_to_entry(JournalFile *f, uint64_t seqnum, Object **ret, uint64_t *offset) {

Object *o;

uint64_t lower, upper, p, n, k;

int r;

assert(f);

n = le64toh(f->header->bisect_table_size) / sizeof(uint64_t);

k = le64toh(f->header->arena_max_size) / n;

lower = 0;

upper = le64toh(f->header->last_bisect_offset)/k+1;

while (lower < upper) {

k = (upper + lower) / 2;

p = le64toh(f->bisect_table[k]);

if (p == 0) {

upper = k;

continue;

}

r = journal_file_move_to_object(f, p, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (o->entry.seqnum == seqnum) {

if (ret)

*ret = o;

if (offset)

*offset = p;

return 1;

} else if (seqnum < o->entry.seqnum)

upper = k;

else if (seqnum > o->entry.seqnum)

lower = k+1;

}

assert(lower == upper);

if (lower <= 0)

return 0;

/* The object we are looking for is between

p = le64toh(f->bisect_table[lower-1]);

for (;;) {

r = journal_file_move_to_object(f, p, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (o->entry.seqnum == seqnum) {

if (ret)

*ret = o;

if (offset)

*offset = p;

return 1;

} if (seqnum < o->entry.seqnum)

return 0;

if (o->entry.next_entry_offset == 0)

return 0;

p = le64toh(o->entry.next_entry_offset);

}

return 0;

}

int journal_file_next_entry(JournalFile *f, Object *o, Object **ret, uint64_t *offset) {

uint64_t np;

int r;

assert(f);

if (!o)

np = le64toh(f->header->head_entry_offset);

else {

if (le64toh(o->object.type) != OBJECT_ENTRY)

return -EINVAL;

np = le64toh(o->entry.next_entry_offset);

}

if (np == 0)

return 0;

r = journal_file_move_to_object(f, np, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = np;

return 1;

}

int journal_file_prev_entry(JournalFile *f, Object *o, Object **ret, uint64_t *offset) {

uint64_t np;

int r;

assert(f);

if (!o)

np = le64toh(f->header->tail_entry_offset);

else {

if (le64toh(o->object.type) != OBJECT_ENTRY)

return -EINVAL;

np = le64toh(o->entry.prev_entry_offset);

}

if (np == 0)

return 0;

r = journal_file_move_to_object(f, np, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = np;

return 1;

}

int journal_file_find_first_entry(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset) {

uint64_t p, osize, hash, h;

int r;

assert(f);

assert(data || size == 0);

osize = offsetof(Object, data.payload) + size;

hash = hash64(data, size);

h = hash % (le64toh(f->header->hash_table_size) / sizeof(HashItem));

p = le64toh(f->hash_table[h].head_hash_offset);

while (p != 0) {

Object *o;

r = journal_file_move_to_object(f, p, OBJECT_DATA, &o);

if (r < 0)

return r;

if (le64toh(o->object.size) == osize &&

memcmp(o->data.payload, data, size) == 0) {

if (le64toh(o->data.hash) != hash)

return -EBADMSG;

if (o->data.head_entry_offset == 0)

return 0;

p = le64toh(o->data.head_entry_offset);

r = journal_file_move_to_object(f, p, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = p;

return 1;

}

p = le64toh(o->data.next_hash_offset);

}

return 0;

}

int journal_file_find_last_entry(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset) {

uint64_t p, osize, hash, h;

int r;

assert(f);

assert(data || size == 0);

osize = offsetof(Object, data.payload) + size;

hash = hash64(data, size);

h = hash % (le64toh(f->header->hash_table_size) / sizeof(HashItem));

p = le64toh(f->hash_table[h].tail_hash_offset);

while (p != 0) {

Object *o;

r = journal_file_move_to_object(f, p, OBJECT_DATA, &o);

if (r < 0)

return r;

if (le64toh(o->object.size) == osize &&

memcmp(o->data.payload, data, size) == 0) {

if (le64toh(o->data.hash) != hash)

return -EBADMSG;

if (o->data.tail_entry_offset == 0)

return 0;

p = le64toh(o->data.tail_entry_offset);

r = journal_file_move_to_object(f, p, OBJECT_ENTRY, &o);

if (r < 0)

return r;

if (ret)

*ret = o;

if (offset)

*offset = p;

return 1;

}

p = le64toh(o->data.prev_hash_offset);

}

return 0;

}

void journal_file_dump(JournalFile *f) {

char a[33], b[33], c[33];

Object *o;

int r;

uint64_t p;

assert(f);

printf("File ID: %s\n"

"Machine ID: %s\n"

"Boot ID: %s\n"

"Arena size: %llu\n",

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),

(unsigned long long) le64toh(f->header->arena_size));

p = le64toh(f->header->head_object_offset);

while (p != 0) {

r = journal_file_move_to_object(f, p, -1, &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_ENTRY:

printf("Type: OBJECT_ENTRY %llu\n", (unsigned long long) le64toh(o->entry.seqnum));

break;

case OBJECT_HASH_TABLE:

printf("Type: OBJECT_HASH_TABLE\n");

break;

case OBJECT_BISECT_TABLE:

printf("Type: OBJECT_BISECT_TABLE\n");

break;

}

if (p == le64toh(f->header->tail_object_offset))

p = 0;

else

p = p + ALIGN64(le64toh(o->object.size));

}

return;

fail:

log_error("File corrupt");

}

int journal_file_open(

const char *fname,

int flags,

mode_t mode,

JournalFile **ret) {

JournalFile *f;

int r;

bool newly_created = false;

assert(fname);

if ((flags & O_ACCMODE) != O_RDONLY &&

(flags & O_ACCMODE) != O_RDWR)

return -EINVAL;

f = new0(JournalFile, 1);

if (!f)

return -ENOMEM;

f->writable = (flags & O_ACCMODE) != O_RDONLY;

f->prot = prot_from_flags(flags);

f->fd = open(fname, flags|O_CLOEXEC, mode);

if (f->fd < 0) {

r = -errno;

goto fail;

}

f->path = strdup(fname);

if (!f->path) {

r = -ENOMEM;

goto fail;

}

if (fstat(f->fd, &f->last_stat) < 0) {

r = -errno;

goto fail;

}

if (f->last_stat.st_size == 0 && f->writable) {

newly_created = true;

r = journal_file_init_header(f);

if (r < 0)

goto fail;

if (fstat(f->fd, &f->last_stat) < 0) {

r = -errno;

goto fail;

}

}

if (f->last_stat.st_size < (off_t) sizeof(Header)) {

r = -EIO;

goto fail;

}

f->header = mmap(NULL, PAGE_ALIGN(sizeof(Header)), prot_from_flags(flags), MAP_SHARED, f->fd, 0);

if (f->header == MAP_FAILED) {

f->header = NULL;

r = -errno;

goto fail;

}

if (!newly_created) {

r = journal_file_verify_header(f);

if (r < 0)

goto fail;

}

if (f->writable) {

r = journal_file_refresh_header(f);

if (r < 0)

goto fail;

}

if (newly_created) {

r = journal_file_setup_hash_table(f);

if (r < 0)

goto fail;

r = journal_file_setup_bisect_table(f);

if (r < 0)

goto fail;

}

r = journal_file_map_hash_table(f);

if (r < 0)

goto fail;

r = journal_file_map_bisect_table(f);

if (r < 0)

goto fail;

if (ret)

*ret = f;

return 0;

fail:

journal_file_close(f);

return r;

}