mail-transaction-log-append.c revision 4b231ca0bbe3b536acbd350101e183441ce0247a
/* Copyright (C) 2003-2004 Timo Sirainen */
#include "lib.h"
#include "ioloop.h"
#include "buffer.h"
#include "write-full.h"
#include "mail-index-private.h"
#include "mail-index-view-private.h"
#include "mail-index-transaction-private.h"
#include "mail-transaction-log-private.h"
static int log_append_buffer(struct mail_transaction_log_file *file,
const buffer_t *buf, const buffer_t *hdr_buf,
enum mail_transaction_type type, int external)
{
struct mail_transaction_header hdr;
const void *data, *hdr_data;
size_t size, hdr_data_size;
uint32_t hdr_size;
i_assert((type & MAIL_TRANSACTION_TYPE_MASK) != 0);
data = buffer_get_data(buf, &size);
if (size == 0)
return 0;
i_assert((size % 4) == 0);
if (hdr_buf != NULL) {
hdr_data = buffer_get_data(hdr_buf, &hdr_data_size);
i_assert((hdr_data_size % 4) == 0);
} else {
hdr_data = NULL;
hdr_data_size = 0;
}
memset(&hdr, 0, sizeof(hdr));
hdr.type = type;
if (type == MAIL_TRANSACTION_EXPUNGE)
hdr.type |= MAIL_TRANSACTION_EXPUNGE_PROT;
if (external)
hdr.type |= MAIL_TRANSACTION_EXTERNAL;
hdr_size = mail_index_uint32_to_offset(sizeof(hdr) + size +
hdr_data_size);
if (!MAIL_TRANSACTION_LOG_FILE_IN_MEMORY(file)) {
if (file->first_append_size == 0) {
/* size will be written later once everything is in
disk */
file->first_append_size = hdr_size;
} else {
hdr.size = hdr_size;
}
if (pwrite_full(file->fd, &hdr, sizeof(hdr),
file->sync_offset) < 0)
return -1;
file->sync_offset += sizeof(hdr);
if (hdr_data_size > 0) {
if (pwrite_full(file->fd, hdr_data, hdr_data_size,
file->sync_offset) < 0)
return -1;
file->sync_offset += hdr_data_size;
}
if (pwrite_full(file->fd, data, size, file->sync_offset) < 0)
return -1;
file->sync_offset += size;
} else {
hdr.size = hdr_size;
i_assert(file->buffer_offset + file->buffer->used ==
file->sync_offset);
buffer_append(file->buffer, &hdr, sizeof(hdr));
buffer_append(file->buffer, hdr_data, hdr_data_size);
buffer_append(file->buffer, data, size);
file->sync_offset = file->buffer_offset + file->buffer->used;
}
return 0;
}
static const buffer_t *
log_get_hdr_update_buffer(struct mail_index_transaction *t)
{
buffer_t *buf;
struct mail_transaction_header_update u;
uint16_t offset;
int state = 0;
memset(&u, 0, sizeof(u));
buf = buffer_create_dynamic(pool_datastack_create(), 256);
for (offset = 0; offset <= sizeof(t->hdr_change); offset++) {
if (offset < sizeof(t->hdr_change) && t->hdr_mask[offset]) {
if (state == 0) {
u.offset = offset;
state++;
}
} else {
if (state > 0) {
u.size = offset - u.offset;
buffer_append(buf, &u, sizeof(uint16_t)*2);
buffer_append(buf, t->hdr_change + u.offset,
u.size);
state = 0;
}
}
}
return buf;
}
static int log_append_ext_intro(struct mail_transaction_log_file *file,
struct mail_index_transaction *t,
uint32_t ext_id, uint32_t reset_id)
{
const struct mail_index_ext *ext;
struct mail_transaction_ext_intro *intro;
buffer_t *buf;
uint32_t idx;
unsigned int count;
if (!mail_index_map_get_ext_idx(t->view->map, ext_id, &idx)) {
/* new extension */
idx = (uint32_t)-1;
}
ext = array_idx(&t->view->index->extensions, ext_id);
if (!array_is_created(&t->ext_resizes)) {
intro = NULL;
count = 0;
} else {
intro = array_get_modifyable(&t->ext_resizes, &count);
}
buf = buffer_create_dynamic(pool_datastack_create(), 128);
if (ext_id < count && intro[ext_id].name_size != 0) {
/* we're resizing it */
intro += ext_id;
i_assert(intro->ext_id == idx);
intro->name_size = idx != (uint32_t)-1 ? 0 :
strlen(ext->name);
buffer_append(buf, intro, sizeof(*intro));
} else {
/* generate a new intro structure */
intro = buffer_append_space_unsafe(buf, sizeof(*intro));
intro->ext_id = idx;
intro->hdr_size = ext->hdr_size;
intro->record_size = ext->record_size;
intro->record_align = ext->record_align;
intro->name_size = idx != (uint32_t)-1 ? 0 :
strlen(ext->name);
}
if (reset_id != 0) {
/* we're going to reset this extension in this transaction */
intro->reset_id = reset_id;
} else if (idx != (uint32_t)-1) {
/* use the existing reset_id */
const struct mail_index_ext *map_ext =
array_idx(&t->view->map->extensions, idx);
intro->reset_id = map_ext->reset_id;
} else {
/* new extension, reset_id defaults to 0 */
}
buffer_append(buf, ext->name, intro->name_size);
if ((buf->used % 4) != 0)
buffer_append_zero(buf, 4 - (buf->used % 4));
return log_append_buffer(file, buf, NULL, MAIL_TRANSACTION_EXT_INTRO,
t->external);
}
static int
mail_transaction_log_append_ext_intros(struct mail_transaction_log_file *file,
struct mail_index_transaction *t)
{
const struct mail_transaction_ext_intro *resize;
struct mail_transaction_ext_reset ext_reset;
unsigned int update_count, resize_count, reset_count, ext_count;
uint32_t ext_id;
const uint32_t *reset;
const array_t *update;
buffer_t *buf;
if (!array_is_created(&t->ext_rec_updates)) {
update = NULL;
update_count = 0;
} else {
update = array_get(&t->ext_rec_updates, &update_count);
}
if (!array_is_created(&t->ext_resizes)) {
resize = NULL;
resize_count = 0;
} else {
resize = array_get(&t->ext_resizes, &resize_count);
}
if (!array_is_created(&t->ext_resets)) {
reset = NULL;
reset_count = 0;
} else {
reset = array_get(&t->ext_resets, &reset_count);
}
memset(&ext_reset, 0, sizeof(ext_reset));
buf = buffer_create_data(pool_datastack_create(),
&ext_reset, sizeof(ext_reset));
buffer_set_used_size(buf, sizeof(ext_reset));
ext_count = I_MAX(I_MAX(update_count, resize_count), reset_count);
for (ext_id = 0; ext_id < ext_count; ext_id++) {
ext_reset.new_reset_id =
ext_id < reset_count && reset[ext_id] != 0 ?
reset[ext_id] : 0;
if ((ext_id < resize_count && resize[ext_id].name_size) ||
(ext_id < update_count &&
array_is_created(&update[ext_id])) ||
ext_reset.new_reset_id != 0) {
if (log_append_ext_intro(file, t, ext_id, 0) < 0)
return -1;
}
if (ext_reset.new_reset_id != 0) {
if (log_append_buffer(file, buf, NULL,
MAIL_TRANSACTION_EXT_RESET,
t->external) < 0)
return -1;
}
}
return 0;
}
static int log_append_ext_rec_updates(struct mail_transaction_log_file *file,
struct mail_index_transaction *t)
{
array_t *updates;
const uint32_t *reset;
unsigned int ext_id, count, reset_count;
uint32_t reset_id;
if (!array_is_created(&t->ext_rec_updates)) {
updates = NULL;
count = 0;
} else {
updates = array_get_modifyable(&t->ext_rec_updates, &count);
}
if (!array_is_created(&t->ext_resets)) {
reset = NULL;
reset_count = 0;
} else {
reset = array_get_modifyable(&t->ext_resets, &reset_count);
}
for (ext_id = 0; ext_id < count; ext_id++) {
if (!array_is_created(&updates[ext_id]))
continue;
reset_id = ext_id < reset_count && reset[ext_id] != 0 ?
reset[ext_id] : 0;
if (log_append_ext_intro(file, t, ext_id, reset_id) < 0)
return -1;
if (log_append_buffer(file, updates[ext_id].buffer, NULL,
MAIL_TRANSACTION_EXT_REC_UPDATE,
t->external) < 0)
return -1;
}
return 0;
}
static int log_append_keyword_updates(struct mail_transaction_log_file *file,
struct mail_index_transaction *t)
{
struct mail_index *index = t->view->index;
struct mail_transaction_keyword_update kt_hdr;
buffer_t *hdr_buf;
array_t *updates;
unsigned int i, count;
hdr_buf = buffer_create_dynamic(pool_datastack_create(), 64);
updates = array_get_modifyable(&t->keyword_updates, &count);
for (i = 0; i < count; i++) {
if (!array_is_created(&updates[i]))
continue;
buffer_set_used_size(hdr_buf, 0);
memset(&kt_hdr, 0, sizeof(kt_hdr));
kt_hdr.modify_type = (i & 1) == 0 ? MODIFY_ADD : MODIFY_REMOVE;
kt_hdr.name_size = strlen(index->keywords[i / 2]);
buffer_append(hdr_buf, &kt_hdr, sizeof(kt_hdr));
buffer_append(hdr_buf, index->keywords[i / 2],
kt_hdr.name_size);
if ((hdr_buf->used % 4) != 0)
buffer_append_zero(hdr_buf, 4 - (hdr_buf->used % 4));
if (log_append_buffer(file, updates[i].buffer, hdr_buf,
MAIL_TRANSACTION_KEYWORD_UPDATE,
t->external) < 0)
return -1;
}
return 0;
}
int mail_transaction_log_append(struct mail_index_transaction *t,
uint32_t *log_file_seq_r,
uoff_t *log_file_offset_r)
{
struct mail_index_view *view = t->view;
struct mail_index *index;
struct mail_transaction_log *log;
struct mail_transaction_log_file *file;
struct mail_index_header idx_hdr;
uoff_t append_offset;
unsigned int lock_id;
int ret, visibility_changes = FALSE;
index = mail_index_view_get_index(view);
log = index->log;
if (!t->log_updates) {
/* nothing to append */
*log_file_seq_r = 0;
*log_file_offset_r = 0;
return 0;
}
if (log->index->log_locked) {
i_assert(t->external);
} else {
if (mail_transaction_log_lock_head(log) < 0)
return -1;
/* update sync_offset */
if (mail_transaction_log_file_map(log->head,
log->head->sync_offset,
(uoff_t)-1) < 0) {
mail_transaction_log_file_unlock(log->head);
return -1;
}
}
if (log->head->sync_offset > MAIL_TRANSACTION_LOG_ROTATE_SIZE &&
(time_t)log->head->hdr.create_stamp <
ioloop_time - MAIL_TRANSACTION_LOG_ROTATE_TIME) {
/* we might want to rotate, but check first that everything is
synced in index. */
if (mail_index_lock_shared(log->index, TRUE, &lock_id) < 0) {
if (!log->index->log_locked)
mail_transaction_log_file_unlock(log->head);
return -1;
}
if (mail_index_map(index, FALSE) <= 0) {
mail_index_unlock(index, lock_id);
if (!log->index->log_locked)
mail_transaction_log_file_unlock(log->head);
return -1;
}
idx_hdr = *log->index->hdr;
mail_index_unlock(log->index, lock_id);
if (log->head->hdr.file_seq == idx_hdr.log_file_seq &&
log->head->sync_offset == idx_hdr.log_file_int_offset &&
log->head->sync_offset == idx_hdr.log_file_ext_offset) {
if (mail_transaction_log_rotate(log, TRUE) < 0) {
/* that didn't work. well, try to continue
anyway */
}
}
}
file = log->head;
file->first_append_size = 0;
append_offset = file->sync_offset;
ret = 0;
/* send all extension introductions and resizes before appends
to avoid resize overhead as much as possible */
ret = mail_transaction_log_append_ext_intros(file, t);
if (array_is_created(&t->appends) && ret == 0) {
visibility_changes = TRUE;
ret = log_append_buffer(file, t->appends.buffer, NULL,
MAIL_TRANSACTION_APPEND, t->external);
}
if (array_is_created(&t->updates) && ret == 0) {
visibility_changes = TRUE;
ret = log_append_buffer(file, t->updates.buffer, NULL,
MAIL_TRANSACTION_FLAG_UPDATE,
t->external);
}
if (array_is_created(&t->ext_rec_updates) && ret == 0)
ret = log_append_ext_rec_updates(file, t);
/* keyword resets before updates */
if (array_is_created(&t->keyword_resets) && ret == 0) {
visibility_changes = TRUE;
ret = log_append_buffer(file, t->keyword_resets.buffer, NULL,
MAIL_TRANSACTION_KEYWORD_RESET,
t->external);
}
if (array_is_created(&t->keyword_updates) && ret == 0) {
visibility_changes = TRUE;
ret = log_append_keyword_updates(file, t);
}
if (array_is_created(&t->expunges) && ret == 0) {
ret = log_append_buffer(file, t->expunges.buffer, NULL,
MAIL_TRANSACTION_EXPUNGE, t->external);
}
if (t->hdr_changed && ret == 0) {
ret = log_append_buffer(file, log_get_hdr_update_buffer(t),
NULL, MAIL_TRANSACTION_HEADER_UPDATE,
t->external);
}
if (ret < 0) {
mail_index_file_set_syscall_error(log->index, file->filepath,
"pwrite()");
}
if (ret == 0 && visibility_changes && t->hide_transaction) {
mail_index_view_add_synced_transaction(view, file->hdr.file_seq,
append_offset);
}
if (!MAIL_TRANSACTION_LOG_FILE_IN_MEMORY(file)) {
if (ret == 0 && fsync(file->fd) < 0) {
/* we don't know how much of it got written,
it may be corrupted now.. */
mail_index_file_set_syscall_error(log->index,
file->filepath,
"fsync()");
ret = -1;
}
if (ret == 0 && file->first_append_size != 0) {
/* synced - rewrite first record's header */
ret = pwrite_full(file->fd, &file->first_append_size,
sizeof(uint32_t), append_offset);
if (ret < 0) {
mail_index_file_set_syscall_error(log->index,
file->filepath, "pwrite()");
}
}
}
if (ret < 0)
file->sync_offset = append_offset;
*log_file_seq_r = file->hdr.file_seq;
*log_file_offset_r = file->sync_offset;
if (!log->index->log_locked)
mail_transaction_log_file_unlock(file);
return ret;
}