2058N/A

3996N/A

3996N/A#include "lib.h"

2058N/A#include "array.h"

2058N/A#include "hash.h"

2058N/A#include "istream.h"

6033N/A#include "ostream.h"

2058N/A#include "str.h"

2058N/A#include "file-dotlock.h"

2058N/A#include "close-keep-errno.h"

6033N/A#include "nfs-workarounds.h"

2058N/A#include "maildir-storage.h"

2058N/A#include "maildir-sync.h"

2058N/A#include "maildir-filename.h"

2058N/A#include "maildir-uidlist.h"

6033N/A

3778N/A#include <stdio.h>

3996N/A#include <stdlib.h>

3996N/A#include <sys/stat.h>

3996N/A

2058N/A#define UIDLIST_ESTALE_RETRY_COUNT NFS_ESTALE_RETRY_COUNT

2605N/A

2058N/A#define UIDLIST_LOCK_STALE_TIMEOUT (60*2)

2058N/A

2058N/A#define UIDLIST_VERSION 3

3789N/A#define UIDLIST_COMPRESS_PERCENTAGE 75

3789N/A

2058N/A#define UIDLIST_IS_LOCKED(uidlist) \

4070N/A ((uidlist)->lock_count > 0)

2058N/A

2058N/Astruct maildir_uidlist_rec {

2058N/A uint32_t uid;

2058N/A uint32_t flags;

2058N/A char *filename;

2058N/A unsigned char *extensions; /* <data>\0[<data>\0 ...]\0 */

2058N/A};

2058N/AARRAY_DEFINE_TYPE(maildir_uidlist_rec_p, struct maildir_uidlist_rec *);

2058N/A

2058N/Astruct maildir_uidlist {

2058N/A struct maildir_mailbox *mbox;

2058N/A struct index_mailbox *ibox;

2058N/A char *path;

2058N/A

3996N/A int fd;

dev_t fd_dev;

ino_t fd_ino;

off_t fd_size;

unsigned int lock_count;

struct dotlock_settings dotlock_settings;

struct dotlock *dotlock;

pool_t record_pool;

ARRAY_TYPE(maildir_uidlist_rec_p) records;

struct hash_table *files;

unsigned int change_counter;

unsigned int version;

unsigned int uid_validity, next_uid, prev_read_uid, last_seen_uid;

unsigned int read_records_count, read_line_count;

uoff_t last_read_offset;

string_t *hdr_extensions;

unsigned int recreate:1;

unsigned int initial_read:1;

unsigned int initial_hdr_read:1;

unsigned int initial_sync:1;

};

struct maildir_uidlist_sync_ctx {

struct maildir_uidlist *uidlist;

enum maildir_uidlist_sync_flags sync_flags;

pool_t record_pool;

ARRAY_TYPE(maildir_uidlist_rec_p) records;

struct hash_table *files;

unsigned int first_unwritten_pos, first_nouid_pos;

unsigned int new_files_count;

unsigned int finish_change_counter;

unsigned int partial:1;

unsigned int finished:1;

unsigned int changed:1;

unsigned int failed:1;

unsigned int locked:1;

};

struct maildir_uidlist_iter_ctx {

struct maildir_uidlist *uidlist;

struct maildir_uidlist_rec *const *next, *const *end;

unsigned int change_counter;

uint32_t prev_uid;

};

static bool maildir_uidlist_iter_next_rec(struct maildir_uidlist_iter_ctx *ctx,

struct maildir_uidlist_rec **rec_r);

static int maildir_uidlist_lock_timeout(struct maildir_uidlist *uidlist,

bool nonblock, bool refresh)

{

struct mailbox *box = &uidlist->ibox->box;

const char *control_dir, *path;

mode_t old_mask;

const enum dotlock_create_flags dotlock_flags =

nonblock ? DOTLOCK_CREATE_FLAG_NONBLOCK : 0;

int i, ret;

if (uidlist->lock_count > 0) {

uidlist->lock_count++;

return 1;

}

control_dir = mailbox_list_get_path(box->storage->list, box->name,

MAILBOX_LIST_PATH_TYPE_CONTROL);

path = t_strconcat(control_dir, "/" MAILDIR_UIDLIST_NAME, NULL);

for (i = 0;; i++) {

old_mask = umask(0777 & ~box->file_create_mode);

ret = file_dotlock_create(&uidlist->dotlock_settings, path,

dotlock_flags, &uidlist->dotlock);

umask(old_mask);

if (ret > 0)

break;

/* failure */

if (ret == 0) {

mail_storage_set_error(box->storage,

MAIL_ERROR_TEMP, MAIL_ERRSTR_LOCK_TIMEOUT);

return 0;

}

if (errno != ENOENT || i == MAILDIR_DELETE_RETRY_COUNT ||

uidlist->mbox == NULL) {

mail_storage_set_critical(box->storage,

"file_dotlock_create(%s) failed: %m", path);

return -1;

}

/* the control dir doesn't exist. create it unless the whole

if (maildir_set_deleted(uidlist->mbox))

return -1;

}

uidlist->lock_count++;

if (refresh) {

/* make sure we have the latest changes before

if (maildir_uidlist_refresh(uidlist) < 0) {

maildir_uidlist_unlock(uidlist);

return -1;

}

}

return 1;

}

int maildir_uidlist_lock(struct maildir_uidlist *uidlist)

{

return maildir_uidlist_lock_timeout(uidlist, FALSE, TRUE);

}

int maildir_uidlist_try_lock(struct maildir_uidlist *uidlist)

{

return maildir_uidlist_lock_timeout(uidlist, TRUE, TRUE);

}

int maildir_uidlist_lock_touch(struct maildir_uidlist *uidlist)

{

i_assert(UIDLIST_IS_LOCKED(uidlist));

return file_dotlock_touch(uidlist->dotlock);

}

bool maildir_uidlist_is_locked(struct maildir_uidlist *uidlist)

{

return UIDLIST_IS_LOCKED(uidlist);

}

void maildir_uidlist_unlock(struct maildir_uidlist *uidlist)

{

i_assert(uidlist->lock_count > 0);

if (--uidlist->lock_count > 0)

return;

(void)file_dotlock_delete(&uidlist->dotlock);

}

struct maildir_uidlist *

maildir_uidlist_init_readonly(struct index_mailbox *ibox)

{

struct mailbox *box = &ibox->box;

struct maildir_uidlist *uidlist;

const char *control_dir;

control_dir = mailbox_list_get_path(box->storage->list, box->name,

MAILBOX_LIST_PATH_TYPE_CONTROL);

uidlist = i_new(struct maildir_uidlist, 1);

uidlist->fd = -1;

uidlist->ibox = ibox;

uidlist->path = i_strconcat(control_dir, "/"MAILDIR_UIDLIST_NAME, NULL);

i_array_init(&uidlist->records, 128);

uidlist->files = hash_create(default_pool, default_pool, 4096,

maildir_filename_base_hash,

maildir_filename_base_cmp);

uidlist->next_uid = 1;

uidlist->hdr_extensions = str_new(default_pool, 128);

uidlist->dotlock_settings.use_io_notify = TRUE;

uidlist->dotlock_settings.use_excl_lock =

(box->storage->flags & MAIL_STORAGE_FLAG_DOTLOCK_USE_EXCL) != 0;

uidlist->dotlock_settings.nfs_flush =

(box->storage->flags &

MAIL_STORAGE_FLAG_NFS_FLUSH_STORAGE) != 0;

uidlist->dotlock_settings.timeout = UIDLIST_LOCK_STALE_TIMEOUT + 2;

uidlist->dotlock_settings.stale_timeout = UIDLIST_LOCK_STALE_TIMEOUT;

return uidlist;

}

struct maildir_uidlist *maildir_uidlist_init(struct maildir_mailbox *mbox)

{

struct maildir_uidlist *uidlist;

uidlist = maildir_uidlist_init_readonly(&mbox->ibox);

uidlist->mbox = mbox;

uidlist->dotlock_settings.temp_prefix = mbox->storage->temp_prefix;

return uidlist;

}

static void maildir_uidlist_close(struct maildir_uidlist *uidlist)

{

if (uidlist->fd != -1) {

if (close(uidlist->fd) < 0)

i_error("close(%s) failed: %m", uidlist->path);

uidlist->fd = -1;

uidlist->fd_ino = 0;

}

uidlist->last_read_offset = 0;

uidlist->read_line_count = 0;

}

void maildir_uidlist_deinit(struct maildir_uidlist **_uidlist)

{

struct maildir_uidlist *uidlist = *_uidlist;

i_assert(!UIDLIST_IS_LOCKED(uidlist));

*_uidlist = NULL;

maildir_uidlist_update(uidlist);

maildir_uidlist_close(uidlist);

hash_destroy(&uidlist->files);

if (uidlist->record_pool != NULL)

pool_unref(&uidlist->record_pool);

array_free(&uidlist->records);

str_free(&uidlist->hdr_extensions);

i_free(uidlist->path);

i_free(uidlist);

}

static int maildir_uid_cmp(const void *p1, const void *p2)

{

const struct maildir_uidlist_rec *const *rec1 = p1, *const *rec2 = p2;

return (*rec1)->uid < (*rec2)->uid ? -1 :

(*rec1)->uid > (*rec2)->uid ? 1 : 0;

}

static void ATTR_FORMAT(2, 3)

maildir_uidlist_set_corrupted(struct maildir_uidlist *uidlist,

const char *fmt, ...)

{

struct mail_storage *storage = uidlist->ibox->box.storage;

va_list args;

va_start(args, fmt);

mail_storage_set_critical(storage, "Broken file %s line %u: %s",

uidlist->path, uidlist->read_line_count,

t_strdup_vprintf(fmt, args));

va_end(args);

}

static void maildir_uidlist_update_hdr(struct maildir_uidlist *uidlist,

const struct stat *st)

{

struct maildir_index_header *mhdr;

if (uidlist->mbox == NULL) {

/* dbox is using this */

return;

}

mhdr = &uidlist->mbox->maildir_hdr;

mhdr->uidlist_mtime = st->st_mtime;

mhdr->uidlist_mtime_nsecs = ST_MTIME_NSEC(*st);

mhdr->uidlist_size = st->st_size;

}

static void

maildir_uidlist_records_array_delete(struct maildir_uidlist *uidlist,

struct maildir_uidlist_rec *rec)

{

struct maildir_uidlist_rec *const *recs, *const *pos;

unsigned int count;

recs = array_get(&uidlist->records, &count);

pos = bsearch(&rec, recs, count, sizeof(*recs), maildir_uid_cmp);

i_assert(pos != NULL);

array_delete(&uidlist->records, pos - recs, 1);

}

static bool

maildir_uidlist_read_extended(struct maildir_uidlist *uidlist,

const char **line_p,

struct maildir_uidlist_rec *rec)

{

const char *start, *line = *line_p;

buffer_t *buf;

buf = buffer_create_dynamic(pool_datastack_create(), 128);

while (*line != '\0' && *line != ':') {

/* skip over an extension field */

start = line;

while (*line != ' ' && *line != '\0') line++;

buffer_append(buf, start, line - start);

buffer_append_c(buf, '\0');

while (*line == ' ') line++;

}

if (buf->used > 0) {

/* save the extensions */

buffer_append_c(buf, '\0');

rec->extensions = p_malloc(uidlist->record_pool, buf->used);

memcpy(rec->extensions, buf->data, buf->used);

}

if (*line == ':')

line++;

if (*line == '\0')

return FALSE;

*line_p = line;

return TRUE;

}

static bool maildir_uidlist_next(struct maildir_uidlist *uidlist,

const char *line)

{

struct maildir_uidlist_rec *rec, *old_rec;

uint32_t uid;

uid = 0;

while (*line >= '0' && *line <= '9') {

uid = uid*10 + (*line - '0');

line++;

}

if (uid == 0 || *line != ' ') {

/* invalid file */

maildir_uidlist_set_corrupted(uidlist, "Invalid data: %s",

line);

return FALSE;

}

if (uid <= uidlist->prev_read_uid) {

maildir_uidlist_set_corrupted(uidlist,

"UIDs not ordered (%u > %u)",

uid, uidlist->prev_read_uid);

return FALSE;

}

uidlist->prev_read_uid = uid;

if (uid <= uidlist->last_seen_uid) {

/* we already have this */

return TRUE;

}

uidlist->last_seen_uid = uid;

if (uid >= uidlist->next_uid && uidlist->version == 1) {

maildir_uidlist_set_corrupted(uidlist,

"UID larger than next_uid (%u >= %u)",

uid, uidlist->next_uid);

return FALSE;

}

rec = p_new(uidlist->record_pool, struct maildir_uidlist_rec, 1);

rec->uid = uid;

rec->flags = MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;

while (*line == ' ') line++;

if (uidlist->version == UIDLIST_VERSION) {

/* read extended fields */

bool ret;

T_BEGIN {

ret = maildir_uidlist_read_extended(uidlist, &line,

rec);

} T_END;

if (!ret) {

maildir_uidlist_set_corrupted(uidlist,

"Invalid extended fields: %s", line);

return FALSE;

}

}

if (strchr(line, '/') != NULL) {

maildir_uidlist_set_corrupted(uidlist,

"%s: Broken filename at line %u: %s",

uidlist->path, uidlist->read_line_count, line);

return FALSE;

}

old_rec = hash_lookup(uidlist->files, line);

if (old_rec != NULL) {

/* This can happen if expunged file is moved back and the file

i_warning("%s: Duplicate file entry at line %u: "

"%s (uid %u -> %u)",

uidlist->path, uidlist->read_line_count, line,

old_rec->uid, uid);

/* Delete the old UID */

maildir_uidlist_records_array_delete(uidlist, old_rec);

/* Replace the old record with this new one */

*old_rec = *rec;

rec = old_rec;

uidlist->recreate = TRUE;

}

rec->filename = p_strdup(uidlist->record_pool, line);

hash_insert(uidlist->files, rec->filename, rec);

array_append(&uidlist->records, &rec, 1);

return TRUE;

}

static int maildir_uidlist_read_header(struct maildir_uidlist *uidlist,

struct istream *input)

{

unsigned int uid_validity, next_uid;

string_t *ext_hdr;

const char *line;

char key;

line = i_stream_read_next_line(input);

if (line == NULL) {

/* I/O error / empty file */

return input->stream_errno == 0 ? 0 : -1;

}

uidlist->read_line_count = 1;

if (*line < '0' || *line > '9' || line[1] != ' ') {

maildir_uidlist_set_corrupted(uidlist,

"Corrupted header (invalid version number)");

return 0;

}

uidlist->version = *line - '0';

line += 2;

switch (uidlist->version) {

case 1:

if (sscanf(line, "%u %u", &uid_validity, &next_uid) != 2) {

maildir_uidlist_set_corrupted(uidlist,

"Corrupted header (version 1)");

return 0;

}

if (uid_validity == uidlist->uid_validity &&

next_uid < uidlist->next_uid) {

maildir_uidlist_set_corrupted(uidlist,

"next_uid was lowered (v1, %u -> %u)",

uidlist->next_uid, next_uid);

return 0;

}

break;

case UIDLIST_VERSION:

ext_hdr = uidlist->hdr_extensions;

str_truncate(ext_hdr, 0);

while (*line != '\0') T_BEGIN {

const char *value;

key = *line;

value = ++line;

while (*line != '\0' && *line != ' ') line++;

value = t_strdup_until(value, line);

switch (key) {

case MAILDIR_UIDLIST_HDR_EXT_UID_VALIDITY:

uid_validity = strtoul(value, NULL, 10);

break;

case MAILDIR_UIDLIST_HDR_EXT_NEXT_UID:

next_uid = strtoul(value, NULL, 10);

break;

default:

if (str_len(ext_hdr) > 0)

str_append_c(ext_hdr, ' ');

str_printfa(ext_hdr, "%c%s", key, value);

break;

}

while (*line == ' ') line++;

} T_END;

break;

default:

maildir_uidlist_set_corrupted(uidlist, "Unsupported version %u",

uidlist->version);

return 0;

}

if (uid_validity == 0 || next_uid == 0) {

maildir_uidlist_set_corrupted(uidlist,

"Broken header (uidvalidity = %u, next_uid=%u)",

uid_validity, next_uid);

return 0;

}

uidlist->uid_validity = uid_validity;

uidlist->next_uid = next_uid;

return 1;

}

static int

maildir_uidlist_update_read(struct maildir_uidlist *uidlist,

bool *retry_r, bool try_retry)

{

struct mail_storage *storage = uidlist->ibox->box.storage;

const char *line;

unsigned int orig_next_uid;

struct istream *input;

struct stat st;

uoff_t last_read_offset;

int fd, ret;

*retry_r = FALSE;

if (uidlist->fd == -1) {

fd = nfs_safe_open(uidlist->path, O_RDWR);

if (fd == -1) {

if (errno != ENOENT) {

mail_storage_set_critical(storage,

"open(%s) failed: %m", uidlist->path);

return -1;

}

return 0;

}

last_read_offset = 0;

} else {

/* the file was updated */

fd = uidlist->fd;

if (lseek(fd, 0, SEEK_SET) < 0) {

mail_storage_set_critical(storage,

"lseek(%s) failed: %m", uidlist->path);

return -1;

}

uidlist->fd = -1;

uidlist->fd_ino = 0;

last_read_offset = uidlist->last_read_offset;

uidlist->last_read_offset = 0;

}

if (fstat(fd, &st) < 0) {

close_keep_errno(fd);

if (errno == ESTALE && try_retry) {

*retry_r = TRUE;

return -1;

}

mail_storage_set_critical(storage,

"fstat(%s) failed: %m", uidlist->path);

return -1;

}

if (uidlist->record_pool == NULL) {

uidlist->record_pool =

pool_alloconly_create(MEMPOOL_GROWING

"uidlist record_pool",

nearest_power(st.st_size -

st.st_size/8));

}

input = i_stream_create_fd(fd, 4096, FALSE);

i_stream_seek(input, last_read_offset);

orig_next_uid = uidlist->next_uid;

ret = input->v_offset != 0 ? 1 :

maildir_uidlist_read_header(uidlist, input);

if (ret > 0) {

uidlist->prev_read_uid = 0;

uidlist->change_counter++;

uidlist->read_records_count = 0;

ret = 1;

while ((line = i_stream_read_next_line(input)) != NULL) {

uidlist->read_records_count++;

uidlist->read_line_count++;

if (!maildir_uidlist_next(uidlist, line)) {

ret = 0;

break;

}

}

if (input->stream_errno != 0)

ret = -1;

if (uidlist->next_uid <= uidlist->prev_read_uid)

uidlist->next_uid = uidlist->prev_read_uid + 1;

if (uidlist->next_uid < orig_next_uid) {

mail_storage_set_critical(storage,

"%s: next_uid was lowered (%u -> %u)",

uidlist->path, orig_next_uid,

uidlist->next_uid);

uidlist->recreate = TRUE;

uidlist->next_uid = orig_next_uid;

}

}

if (ret == 0) {

/* file is broken */

(void)unlink(uidlist->path);

} else if (ret > 0) {

/* success */

uidlist->fd = fd;

uidlist->fd_dev = st.st_dev;

uidlist->fd_ino = st.st_ino;

uidlist->fd_size = st.st_size;

uidlist->last_read_offset = input->v_offset;

maildir_uidlist_update_hdr(uidlist, &st);

} else {

/* I/O error */

if (input->stream_errno == ESTALE && try_retry)

*retry_r = TRUE;

else {

errno = input->stream_errno;

mail_storage_set_critical(storage,

"read(%s) failed: %m", uidlist->path);

}

}

i_stream_destroy(&input);

if (ret <= 0) {

if (close(fd) < 0)

i_error("close(%s) failed: %m", uidlist->path);

}

return ret;

}

static int

maildir_uidlist_stat(struct maildir_uidlist *uidlist, struct stat *st_r)

{

struct mail_storage *storage = uidlist->ibox->box.storage;

if ((storage->flags & MAIL_STORAGE_FLAG_NFS_FLUSH_STORAGE) != 0) {

nfs_flush_file_handle_cache(uidlist->path);

nfs_flush_attr_cache_unlocked(uidlist->path);

}

if (nfs_safe_stat(uidlist->path, st_r) < 0) {

if (errno != ENOENT) {

mail_storage_set_critical(storage,

"stat(%s) failed: %m", uidlist->path);

return -1;

}

return 0;

}

return 1;

}

static int

maildir_uidlist_has_changed(struct maildir_uidlist *uidlist, bool *recreated_r)

{

struct mail_storage *storage = uidlist->ibox->box.storage;

struct stat st;

int ret;

*recreated_r = FALSE;

if ((ret = maildir_uidlist_stat(uidlist, &st)) <= 0)

return ret;

if (st.st_ino != uidlist->fd_ino ||

!CMP_DEV_T(st.st_dev, uidlist->fd_dev)) {

/* file recreated */

*recreated_r = TRUE;

return 1;

}

if ((storage->flags & MAIL_STORAGE_FLAG_NFS_FLUSH_STORAGE) != 0) {

/* NFS: either the file hasn't been changed, or it has already

if (fstat(uidlist->fd, &st) < 0) {

if (errno == ESTALE) {

*recreated_r = TRUE;

return 1;

}

mail_storage_set_critical(storage,

"fstat(%s) failed: %m", uidlist->path);

return -1;

}

}

if (st.st_size != uidlist->fd_size) {

/* file modified but not recreated */

return 1;

} else {

/* unchanged */

return 0;

}

}

int maildir_uidlist_refresh(struct maildir_uidlist *uidlist)

{

unsigned int i;

bool retry, recreated;

int ret;

if (uidlist->fd != -1) {

ret = maildir_uidlist_has_changed(uidlist, &recreated);

if (ret <= 0)

return ret;

if (recreated)

maildir_uidlist_close(uidlist);

}

for (i = 0; ; i++) {

ret = maildir_uidlist_update_read(uidlist, &retry,

i < UIDLIST_ESTALE_RETRY_COUNT);

if (!retry)

break;

/* ESTALE - try reopening and rereading */

maildir_uidlist_close(uidlist);

}

if (ret >= 0) {

uidlist->initial_read = TRUE;

uidlist->initial_hdr_read = TRUE;

}

return ret;

}

int maildir_uidlist_refresh_fast_init(struct maildir_uidlist *uidlist)

{

const struct maildir_index_header *mhdr = &uidlist->mbox->maildir_hdr;

const struct mail_index_header *hdr;

struct stat st;

int ret;

if (uidlist->fd != -1)

return maildir_uidlist_refresh(uidlist);

if ((ret = maildir_uidlist_stat(uidlist, &st)) < 0)

return ret;

if (st.st_size == mhdr->uidlist_size &&

st.st_mtime == mhdr->uidlist_mtime &&

ST_NTIMES_EQUAL(ST_MTIME_NSEC(st), mhdr->uidlist_mtime_nsecs)) {

/* index is up-to-date */

hdr = mail_index_get_header(uidlist->mbox->ibox.view);

uidlist->uid_validity = hdr->uid_validity;

uidlist->next_uid = hdr->next_uid;

uidlist->initial_hdr_read = TRUE;

return 1;

} else {

return maildir_uidlist_refresh(uidlist);

}

}

static struct maildir_uidlist_rec *

maildir_uidlist_lookup_rec(struct maildir_uidlist *uidlist, uint32_t uid,

unsigned int *idx_r)

{

struct maildir_uidlist_rec *const *recs;

unsigned int idx, left_idx, right_idx;

if (!uidlist->initial_read) {

/* first time we need to read uidlist */

if (maildir_uidlist_refresh(uidlist) < 0)

return NULL;

}

idx = left_idx = 0;

recs = array_get(&uidlist->records, &right_idx);

while (left_idx < right_idx) {

idx = (left_idx + right_idx) / 2;

if (recs[idx]->uid < uid)

left_idx = idx+1;

else if (recs[idx]->uid > uid)

right_idx = idx;

else {

*idx_r = idx;

return recs[idx];

}

}

if (idx > 0) idx--;

*idx_r = idx;

return NULL;

}

const char *

maildir_uidlist_lookup(struct maildir_uidlist *uidlist, uint32_t uid,

enum maildir_uidlist_rec_flag *flags_r)

{

const char *fname;

fname = maildir_uidlist_lookup_nosync(uidlist, uid, flags_r);

if (fname == NULL) {

if (uidlist->fd != -1 || uidlist->mbox == NULL) {

/* refresh uidlist and check again in case it was added

if (maildir_uidlist_refresh(uidlist) < 0)

return NULL;

} else {

/* the uidlist doesn't exist. */

if (maildir_storage_sync_force(uidlist->mbox, uid) < 0)

return NULL;

}

/* try again */

fname = maildir_uidlist_lookup_nosync(uidlist, uid, flags_r);

}

return fname;

}

const char *

maildir_uidlist_lookup_nosync(struct maildir_uidlist *uidlist, uint32_t uid,

enum maildir_uidlist_rec_flag *flags_r)

{

const struct maildir_uidlist_rec *rec;

unsigned int idx;

rec = maildir_uidlist_lookup_rec(uidlist, uid, &idx);

if (rec == NULL)

return NULL;

*flags_r = rec->flags;

return rec->filename;

}

const char *

maildir_uidlist_lookup_ext(struct maildir_uidlist *uidlist, uint32_t uid,

enum maildir_uidlist_rec_ext_key key)

{

const struct maildir_uidlist_rec *rec;

unsigned int idx;

const unsigned char *p;

const char *value;

rec = maildir_uidlist_lookup_rec(uidlist, uid, &idx);

if (rec == NULL || rec->extensions == NULL)

return NULL;

p = rec->extensions; value = NULL;

while (*p != '\0') {

/* <key><value>\0 */

if (*p == (char)key)

return (const char *)p + 1;

p += strlen((const char *)p) + 1;

}

return NULL;

}

uint32_t maildir_uidlist_get_uid_validity(struct maildir_uidlist *uidlist)

{

return uidlist->uid_validity;

}

uint32_t maildir_uidlist_get_next_uid(struct maildir_uidlist *uidlist)

{

return !uidlist->initial_hdr_read ? 0 : uidlist->next_uid;

}

void maildir_uidlist_set_uid_validity(struct maildir_uidlist *uidlist,

uint32_t uid_validity)

{

i_assert(uid_validity != 0);

uidlist->uid_validity = uid_validity;

}

void maildir_uidlist_set_next_uid(struct maildir_uidlist *uidlist,

uint32_t next_uid, bool force)

{

if (uidlist->next_uid < next_uid || force)

uidlist->next_uid = next_uid;

}

static void

maildir_uidlist_set_ext_real(struct maildir_uidlist *uidlist, uint32_t uid,

enum maildir_uidlist_rec_ext_key key,

const char *value)

{

struct maildir_uidlist_rec *rec;

unsigned int idx;

const unsigned char *p;

buffer_t *buf;

unsigned int len;

rec = maildir_uidlist_lookup_rec(uidlist, uid, &idx);

if (rec == NULL) {

/* maybe it's a new message */

if (maildir_uidlist_refresh(uidlist) < 0)

return;

rec = maildir_uidlist_lookup_rec(uidlist, uid, &idx);

if (rec == NULL) {

/* message is already expunged, ignore */

return;

}

}

buf = buffer_create_dynamic(pool_datastack_create(), 128);

/* copy existing extensions, except for the one we're updating */

if (rec->extensions != NULL) {

p = rec->extensions;

while (*p != '\0') {

/* <key><value>\0 */

len = strlen((const char *)p) + 1;

if (*p != (char)key)

buffer_append(buf, p, len);

p += len;

}

}

if (value != NULL) {

buffer_append_c(buf, key);

buffer_append(buf, value, strlen(value) + 1);

}

buffer_append_c(buf, '\0');

rec->extensions = p_malloc(uidlist->record_pool, buf->used);

memcpy(rec->extensions, buf->data, buf->used);

uidlist->recreate = TRUE;

}

void maildir_uidlist_set_ext(struct maildir_uidlist *uidlist, uint32_t uid,

enum maildir_uidlist_rec_ext_key key,

const char *value)

{

T_BEGIN {

maildir_uidlist_set_ext_real(uidlist, uid, key, value);

} T_END;

}

static int maildir_uidlist_write_fd(struct maildir_uidlist *uidlist, int fd,

const char *path, unsigned int first_idx,

uoff_t *file_size_r)

{

struct mail_storage *storage = uidlist->ibox->box.storage;

struct maildir_uidlist_iter_ctx *iter;

struct ostream *output;

struct maildir_uidlist_rec *rec;

string_t *str;

const unsigned char *p;

unsigned int len;

int ret;

i_assert(fd != -1);

output = o_stream_create_fd_file(fd, (uoff_t)-1, FALSE);

o_stream_cork(output);

str = t_str_new(512);

if (output->offset == 0) {

i_assert(first_idx == 0);

uidlist->version = UIDLIST_VERSION;

i_assert(uidlist->uid_validity != 0);

i_assert(uidlist->next_uid > 0);

str_printfa(str, "%u V%u N%u", uidlist->version,

uidlist->uid_validity, uidlist->next_uid);

if (str_len(uidlist->hdr_extensions) > 0) {

str_append_c(str, ' ');

str_append_str(str, uidlist->hdr_extensions);

}

str_append_c(str, '\n');

o_stream_send(output, str_data(str), str_len(str));

}

iter = maildir_uidlist_iter_init(uidlist);

i_assert(first_idx <= array_count(&uidlist->records));

iter->next += first_idx;

while (maildir_uidlist_iter_next_rec(iter, &rec)) {

str_truncate(str, 0);

str_printfa(str, "%u", rec->uid);

if (rec->extensions != NULL) {

for (p = rec->extensions; *p != '\0'; ) {

len = strlen((const char *)p);

str_append_c(str, ' ');

str_append_n(str, p, len);

p += len + 1;

}

}

str_printfa(str, " :%s\n", rec->filename);

o_stream_send(output, str_data(str), str_len(str));

}

maildir_uidlist_iter_deinit(&iter);

o_stream_flush(output);

ret = output->stream_errno == 0 ? 0 : -1;

*file_size_r = output->offset;

o_stream_unref(&output);

if (ret < 0) {

mail_storage_set_critical(storage,

"o_stream_send(%s) failed: %m", path);

return -1;

}

if (!uidlist->ibox->fsync_disable) {

if (fdatasync(fd) < 0) {

mail_storage_set_critical(storage,

"fdatasync(%s) failed: %m", path);

return -1;

}

}

return 0;

}

static int maildir_uidlist_recreate(struct maildir_uidlist *uidlist)

{

struct mailbox *box = &uidlist->ibox->box;

const char *control_dir, *temp_path;

struct stat st;

mode_t old_mask;

uoff_t file_size;

int i, fd, ret;

i_assert(uidlist->initial_read);

control_dir = mailbox_list_get_path(box->storage->list, box->name,

MAILBOX_LIST_PATH_TYPE_CONTROL);

temp_path = t_strconcat(control_dir,

"/" MAILDIR_UIDLIST_NAME ".tmp", NULL);

for (i = 0;; i++) {

old_mask = umask(0777 & ~box->file_create_mode);

fd = open(temp_path, O_RDWR | O_CREAT | O_TRUNC, 0777);

umask(old_mask);

if (fd != -1)

break;

if (errno != ENOENT || i == MAILDIR_DELETE_RETRY_COUNT ||

uidlist->mbox == NULL) {

mail_storage_set_critical(box->storage,

"open(%s, O_CREAT) failed: %m", temp_path);

return -1;

}

/* the control dir doesn't exist. create it unless the whole

if (maildir_set_deleted(uidlist->mbox))

return -1;

}

if (box->file_create_gid != (gid_t)-1) {

if (fchown(fd, (uid_t)-1, box->file_create_gid) < 0) {

mail_storage_set_critical(box->storage,

"fchown(%s) failed: %m", temp_path);

}

}

ret = maildir_uidlist_write_fd(uidlist, fd, temp_path, 0, &file_size);

if (ret == 0) {

if (rename(temp_path, uidlist->path) < 0) {

mail_storage_set_critical(box->storage,

"rename(%s, %s) failed: %m",

temp_path, uidlist->path);

ret = -1;

}

}

if (ret < 0) {

if (unlink(temp_path) < 0) {

mail_storage_set_critical(box->storage,

"unlink(%s) failed: %m", temp_path);

}

} else if (fstat(fd, &st) < 0) {

mail_storage_set_critical(box->storage,

"fstat(%s) failed: %m", temp_path);

ret = -1;

} else if (file_size != (uoff_t)st.st_size) {

i_assert(!file_dotlock_is_locked(uidlist->dotlock));

mail_storage_set_critical(box->storage,

"Maildir uidlist dotlock overridden: %s",

uidlist->path);

ret = -1;

} else {

maildir_uidlist_close(uidlist);

uidlist->fd = fd;

uidlist->fd_dev = st.st_dev;

uidlist->fd_ino = st.st_ino;

uidlist->fd_size = st.st_size;

uidlist->last_read_offset = st.st_size;

uidlist->recreate = FALSE;

maildir_uidlist_update_hdr(uidlist, &st);

}

if (ret < 0)

(void)close(fd);

return ret;

}

int maildir_uidlist_update(struct maildir_uidlist *uidlist)

{

int ret;

if (!uidlist->recreate)

return 0;

if (maildir_uidlist_lock(uidlist) <= 0)

return -1;

ret = maildir_uidlist_recreate(uidlist);

maildir_uidlist_unlock(uidlist);

return ret;

}

static bool maildir_uidlist_want_recreate(struct maildir_uidlist_sync_ctx *ctx)

{

struct maildir_uidlist *uidlist = ctx->uidlist;

unsigned int min_rewrite_count;

if (!uidlist->initial_read)

return FALSE;

if (uidlist->recreate || uidlist->fd == -1 ||

uidlist->version != UIDLIST_VERSION ||

ctx->finish_change_counter != uidlist->change_counter)

return TRUE;

min_rewrite_count =

(uidlist->read_records_count + ctx->new_files_count) *

UIDLIST_COMPRESS_PERCENTAGE / 100;

return min_rewrite_count >= array_count(&uidlist->records);

}

static int maildir_uidlist_sync_update(struct maildir_uidlist_sync_ctx *ctx)

{

struct maildir_uidlist *uidlist = ctx->uidlist;

struct stat st;

uoff_t file_size;

if (uidlist->uid_validity == 0) {

/* saving a message to a newly created maildir. */

const struct mail_index_header *hdr;

hdr = mail_index_get_header(uidlist->ibox->view);

uidlist->uid_validity = hdr->uid_validity != 0 ?

hdr->uid_validity : (uint32_t)ioloop_time;

}

if (maildir_uidlist_want_recreate(ctx))

return maildir_uidlist_recreate(uidlist);

if (uidlist->fd == -1) {

/* NOREFRESH flag used. we're just appending some messages. */

i_assert(uidlist->initial_hdr_read);

uidlist->fd = nfs_safe_open(uidlist->path, O_RDWR);

if (uidlist->fd == -1) {

mail_storage_set_critical(uidlist->ibox->box.storage,

"open(%s) failed: %m", uidlist->path);

return -1;

}

}

i_assert(ctx->first_unwritten_pos != (unsigned int)-1);

if (lseek(uidlist->fd, 0, SEEK_END) < 0) {

mail_storage_set_critical(uidlist->ibox->box.storage,

"lseek(%s) failed: %m", uidlist->path);

return -1;

}

if (maildir_uidlist_write_fd(uidlist, uidlist->fd, uidlist->path,

ctx->first_unwritten_pos, &file_size) < 0)

return -1;

if (fstat(uidlist->fd, &st) < 0) {

mail_storage_set_critical(uidlist->ibox->box.storage,

"fstat(%s) failed: %m", uidlist->path);

return -1;

}

if ((uoff_t)st.st_size != file_size) {

i_warning("%s: file size changed unexpectedly after write",

uidlist->path);

} else {

uidlist->fd_size = st.st_size;

uidlist->last_read_offset = st.st_size;

maildir_uidlist_update_hdr(uidlist, &st);

}

return 0;

}

static void maildir_uidlist_mark_all(struct maildir_uidlist *uidlist,

bool nonsynced)

{

struct maildir_uidlist_rec **recs;

unsigned int i, count;

recs = array_get_modifiable(&uidlist->records, &count);

if (nonsynced) {

for (i = 0; i < count; i++)

recs[i]->flags |= MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;

} else {

for (i = 0; i < count; i++)

recs[i]->flags &= ~MAILDIR_UIDLIST_REC_FLAG_NONSYNCED;

}

}

int maildir_uidlist_sync_init(struct maildir_uidlist *uidlist,

enum maildir_uidlist_sync_flags sync_flags,

struct maildir_uidlist_sync_ctx **sync_ctx_r)

{

struct maildir_uidlist_sync_ctx *ctx;

bool nonblock, refresh, locked;

int ret;

nonblock = (sync_flags & MAILDIR_UIDLIST_SYNC_TRYLOCK) != 0;

refresh = (sync_flags & MAILDIR_UIDLIST_SYNC_NOREFRESH) == 0;

ret = maildir_uidlist_lock_timeout(uidlist, nonblock, refresh);

if (ret <= 0) {

if (ret < 0 || !nonblock)

return ret;

/* couldn't lock it */

if ((sync_flags & MAILDIR_UIDLIST_SYNC_FORCE) == 0)

return 0;

/* forcing the sync anyway */

if (maildir_uidlist_refresh(uidlist) < 0)

return -1;

locked = FALSE;

} else {

locked = TRUE;

}

*sync_ctx_r = ctx = i_new(struct maildir_uidlist_sync_ctx, 1);

ctx->uidlist = uidlist;

ctx->sync_flags = sync_flags;

ctx->partial = !locked ||

(sync_flags & MAILDIR_UIDLIST_SYNC_PARTIAL) != 0;

ctx->locked = locked;

ctx->first_unwritten_pos = (unsigned int)-1;

ctx->first_nouid_pos = (unsigned int)-1;

if (ctx->partial) {

if ((sync_flags & MAILDIR_UIDLIST_SYNC_KEEP_STATE) == 0) {

/* initially mark all nonsynced */

maildir_uidlist_mark_all(uidlist, TRUE);

}

return 1;

}