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stack.c
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1414 lines (1217 loc) · 30.8 KB
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/*
Copyright 2020 Google LLC
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file or at
https://developers.google.com/open-source/licenses/bsd
*/
#include "stack.h"
#include "system.h"
#include "merged.h"
#include "reader.h"
#include "refname.h"
#include "reftable-error.h"
#include "reftable-record.h"
#include "reftable-merged.h"
#include "writer.h"
static int stack_try_add(struct reftable_stack *st,
int (*write_table)(struct reftable_writer *wr,
void *arg),
void *arg);
static int stack_write_compact(struct reftable_stack *st,
struct reftable_writer *wr, int first, int last,
struct reftable_log_expiry_config *config);
static int stack_check_addition(struct reftable_stack *st,
const char *new_tab_name);
static void reftable_addition_close(struct reftable_addition *add);
static int reftable_stack_reload_maybe_reuse(struct reftable_stack *st,
int reuse_open);
static void stack_filename(struct strbuf *dest, struct reftable_stack *st,
const char *name)
{
strbuf_reset(dest);
strbuf_addstr(dest, st->reftable_dir);
strbuf_addstr(dest, "/");
strbuf_addstr(dest, name);
}
static ssize_t reftable_fd_write(void *arg, const void *data, size_t sz)
{
int *fdp = (int *)arg;
return write(*fdp, data, sz);
}
int reftable_new_stack(struct reftable_stack **dest, const char *dir,
struct reftable_write_options config)
{
struct reftable_stack *p =
reftable_calloc(sizeof(struct reftable_stack));
struct strbuf list_file_name = STRBUF_INIT;
int err = 0;
if (config.hash_id == 0) {
config.hash_id = GIT_SHA1_FORMAT_ID;
}
*dest = NULL;
strbuf_reset(&list_file_name);
strbuf_addstr(&list_file_name, dir);
strbuf_addstr(&list_file_name, "/tables.list");
p->list_file = strbuf_detach(&list_file_name, NULL);
p->reftable_dir = xstrdup(dir);
p->config = config;
err = reftable_stack_reload_maybe_reuse(p, 1);
if (err < 0) {
reftable_stack_destroy(p);
} else {
*dest = p;
}
return err;
}
static int fd_read_lines(int fd, char ***namesp)
{
off_t size = lseek(fd, 0, SEEK_END);
char *buf = NULL;
int err = 0;
if (size < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
err = lseek(fd, 0, SEEK_SET);
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
buf = reftable_malloc(size + 1);
if (read(fd, buf, size) != size) {
err = REFTABLE_IO_ERROR;
goto done;
}
buf[size] = 0;
parse_names(buf, size, namesp);
done:
reftable_free(buf);
return err;
}
int read_lines(const char *filename, char ***namesp)
{
int fd = open(filename, O_RDONLY);
int err = 0;
if (fd < 0) {
if (errno == ENOENT) {
*namesp = reftable_calloc(sizeof(char *));
return 0;
}
return REFTABLE_IO_ERROR;
}
err = fd_read_lines(fd, namesp);
close(fd);
return err;
}
struct reftable_merged_table *
reftable_stack_merged_table(struct reftable_stack *st)
{
return st->merged;
}
static int has_name(char **names, const char *name)
{
while (*names) {
if (!strcmp(*names, name))
return 1;
names++;
}
return 0;
}
/* Close and free the stack */
void reftable_stack_destroy(struct reftable_stack *st)
{
char **names = NULL;
int err = 0;
if (st->merged) {
reftable_merged_table_free(st->merged);
st->merged = NULL;
}
err = read_lines(st->list_file, &names);
if (err < 0) {
FREE_AND_NULL(names);
}
if (st->readers) {
int i = 0;
struct strbuf filename = STRBUF_INIT;
for (i = 0; i < st->readers_len; i++) {
const char *name = reader_name(st->readers[i]);
strbuf_reset(&filename);
if (names && !has_name(names, name)) {
stack_filename(&filename, st, name);
}
reftable_reader_free(st->readers[i]);
if (filename.len) {
/* On Windows, can only unlink after closing. */
unlink(filename.buf);
}
}
strbuf_release(&filename);
st->readers_len = 0;
FREE_AND_NULL(st->readers);
}
FREE_AND_NULL(st->list_file);
FREE_AND_NULL(st->reftable_dir);
reftable_free(st);
free_names(names);
}
static struct reftable_reader **stack_copy_readers(struct reftable_stack *st,
int cur_len)
{
struct reftable_reader **cur =
reftable_calloc(sizeof(struct reftable_reader *) * cur_len);
int i = 0;
for (i = 0; i < cur_len; i++) {
cur[i] = st->readers[i];
}
return cur;
}
static int reftable_stack_reload_once(struct reftable_stack *st, char **names,
int reuse_open)
{
int cur_len = !st->merged ? 0 : st->merged->stack_len;
struct reftable_reader **cur = stack_copy_readers(st, cur_len);
int err = 0;
int names_len = names_length(names);
struct reftable_reader **new_readers =
reftable_calloc(sizeof(struct reftable_reader *) * names_len);
struct reftable_table *new_tables =
reftable_calloc(sizeof(struct reftable_table) * names_len);
int new_readers_len = 0;
struct reftable_merged_table *new_merged = NULL;
int i;
while (*names) {
struct reftable_reader *rd = NULL;
char *name = *names++;
/* this is linear; we assume compaction keeps the number of
tables under control so this is not quadratic. */
int j = 0;
for (j = 0; reuse_open && j < cur_len; j++) {
if (cur[j] && 0 == strcmp(cur[j]->name, name)) {
rd = cur[j];
cur[j] = NULL;
break;
}
}
if (!rd) {
struct reftable_block_source src = { NULL };
struct strbuf table_path = STRBUF_INIT;
stack_filename(&table_path, st, name);
err = reftable_block_source_from_file(&src,
table_path.buf);
strbuf_release(&table_path);
if (err < 0)
goto done;
err = reftable_new_reader(&rd, &src, name);
if (err < 0)
goto done;
}
new_readers[new_readers_len] = rd;
reftable_table_from_reader(&new_tables[new_readers_len], rd);
new_readers_len++;
}
/* success! */
err = reftable_new_merged_table(&new_merged, new_tables,
new_readers_len, st->config.hash_id);
if (err < 0)
goto done;
new_tables = NULL;
st->readers_len = new_readers_len;
if (st->merged) {
merged_table_release(st->merged);
reftable_merged_table_free(st->merged);
}
if (st->readers) {
reftable_free(st->readers);
}
st->readers = new_readers;
new_readers = NULL;
new_readers_len = 0;
new_merged->suppress_deletions = 1;
st->merged = new_merged;
for (i = 0; i < cur_len; i++) {
if (cur[i]) {
const char *name = reader_name(cur[i]);
struct strbuf filename = STRBUF_INIT;
stack_filename(&filename, st, name);
reader_close(cur[i]);
reftable_reader_free(cur[i]);
/* On Windows, can only unlink after closing. */
unlink(filename.buf);
strbuf_release(&filename);
}
}
done:
for (i = 0; i < new_readers_len; i++) {
reader_close(new_readers[i]);
reftable_reader_free(new_readers[i]);
}
reftable_free(new_readers);
reftable_free(new_tables);
reftable_free(cur);
return err;
}
/* return negative if a before b. */
static int tv_cmp(struct timeval *a, struct timeval *b)
{
time_t diff = a->tv_sec - b->tv_sec;
int udiff = a->tv_usec - b->tv_usec;
if (diff != 0)
return diff;
return udiff;
}
static int reftable_stack_reload_maybe_reuse(struct reftable_stack *st,
int reuse_open)
{
struct timeval deadline = { 0 };
int err = gettimeofday(&deadline, NULL);
int64_t delay = 0;
int tries = 0;
if (err < 0)
return err;
deadline.tv_sec += 3;
while (1) {
char **names = NULL;
char **names_after = NULL;
struct timeval now = { 0 };
int err = gettimeofday(&now, NULL);
int err2 = 0;
if (err < 0) {
return err;
}
/* Only look at deadlines after the first few times. This
simplifies debugging in GDB */
tries++;
if (tries > 3 && tv_cmp(&now, &deadline) >= 0) {
break;
}
err = read_lines(st->list_file, &names);
if (err < 0) {
free_names(names);
return err;
}
err = reftable_stack_reload_once(st, names, reuse_open);
if (err == 0) {
free_names(names);
break;
}
if (err != REFTABLE_NOT_EXIST_ERROR) {
free_names(names);
return err;
}
/* err == REFTABLE_NOT_EXIST_ERROR can be caused by a concurrent
writer. Check if there was one by checking if the name list
changed.
*/
err2 = read_lines(st->list_file, &names_after);
if (err2 < 0) {
free_names(names);
return err2;
}
if (names_equal(names_after, names)) {
free_names(names);
free_names(names_after);
return err;
}
free_names(names);
free_names(names_after);
delay = delay + (delay * rand()) / RAND_MAX + 1;
sleep_millisec(delay);
}
return 0;
}
/* -1 = error
0 = up to date
1 = changed. */
static int stack_uptodate(struct reftable_stack *st)
{
char **names = NULL;
int err = read_lines(st->list_file, &names);
int i = 0;
if (err < 0)
return err;
for (i = 0; i < st->readers_len; i++) {
if (!names[i]) {
err = 1;
goto done;
}
if (strcmp(st->readers[i]->name, names[i])) {
err = 1;
goto done;
}
}
if (names[st->merged->stack_len]) {
err = 1;
goto done;
}
done:
free_names(names);
return err;
}
int reftable_stack_reload(struct reftable_stack *st)
{
int err = stack_uptodate(st);
if (err > 0)
return reftable_stack_reload_maybe_reuse(st, 1);
return err;
}
int reftable_stack_add(struct reftable_stack *st,
int (*write)(struct reftable_writer *wr, void *arg),
void *arg)
{
int err = stack_try_add(st, write, arg);
if (err < 0) {
if (err == REFTABLE_LOCK_ERROR) {
/* Ignore error return, we want to propagate
REFTABLE_LOCK_ERROR.
*/
reftable_stack_reload(st);
}
return err;
}
if (!st->disable_auto_compact)
return reftable_stack_auto_compact(st);
return 0;
}
static void format_name(struct strbuf *dest, uint64_t min, uint64_t max)
{
char buf[100];
uint32_t rnd = (uint32_t)rand();
snprintf(buf, sizeof(buf), "0x%012" PRIx64 "-0x%012" PRIx64 "-%08x",
min, max, rnd);
strbuf_reset(dest);
strbuf_addstr(dest, buf);
}
struct reftable_addition {
int lock_file_fd;
struct strbuf lock_file_name;
struct reftable_stack *stack;
char **new_tables;
int new_tables_len;
uint64_t next_update_index;
};
#define REFTABLE_ADDITION_INIT \
{ \
.lock_file_name = STRBUF_INIT \
}
static int reftable_stack_init_addition(struct reftable_addition *add,
struct reftable_stack *st)
{
int err = 0;
add->stack = st;
strbuf_reset(&add->lock_file_name);
strbuf_addstr(&add->lock_file_name, st->list_file);
strbuf_addstr(&add->lock_file_name, ".lock");
add->lock_file_fd = open(add->lock_file_name.buf,
O_EXCL | O_CREAT | O_WRONLY, 0666);
if (add->lock_file_fd < 0) {
if (errno == EEXIST) {
err = REFTABLE_LOCK_ERROR;
} else {
err = REFTABLE_IO_ERROR;
}
goto done;
}
if (st->config.default_permissions) {
if (chmod(add->lock_file_name.buf, st->config.default_permissions) < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
}
err = stack_uptodate(st);
if (err < 0)
goto done;
if (err > 1) {
err = REFTABLE_LOCK_ERROR;
goto done;
}
add->next_update_index = reftable_stack_next_update_index(st);
done:
if (err) {
reftable_addition_close(add);
}
return err;
}
static void reftable_addition_close(struct reftable_addition *add)
{
int i = 0;
struct strbuf nm = STRBUF_INIT;
for (i = 0; i < add->new_tables_len; i++) {
stack_filename(&nm, add->stack, add->new_tables[i]);
unlink(nm.buf);
reftable_free(add->new_tables[i]);
add->new_tables[i] = NULL;
}
reftable_free(add->new_tables);
add->new_tables = NULL;
add->new_tables_len = 0;
if (add->lock_file_fd > 0) {
close(add->lock_file_fd);
add->lock_file_fd = 0;
}
if (add->lock_file_name.len > 0) {
unlink(add->lock_file_name.buf);
strbuf_release(&add->lock_file_name);
}
strbuf_release(&nm);
}
void reftable_addition_destroy(struct reftable_addition *add)
{
if (!add) {
return;
}
reftable_addition_close(add);
reftable_free(add);
}
int reftable_addition_commit(struct reftable_addition *add)
{
struct strbuf table_list = STRBUF_INIT;
int i = 0;
int err = 0;
if (add->new_tables_len == 0)
goto done;
for (i = 0; i < add->stack->merged->stack_len; i++) {
strbuf_addstr(&table_list, add->stack->readers[i]->name);
strbuf_addstr(&table_list, "\n");
}
for (i = 0; i < add->new_tables_len; i++) {
strbuf_addstr(&table_list, add->new_tables[i]);
strbuf_addstr(&table_list, "\n");
}
err = write(add->lock_file_fd, table_list.buf, table_list.len);
strbuf_release(&table_list);
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
err = close(add->lock_file_fd);
add->lock_file_fd = 0;
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
err = rename(add->lock_file_name.buf, add->stack->list_file);
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
/* success, no more state to clean up. */
strbuf_release(&add->lock_file_name);
for (i = 0; i < add->new_tables_len; i++) {
reftable_free(add->new_tables[i]);
}
reftable_free(add->new_tables);
add->new_tables = NULL;
add->new_tables_len = 0;
err = reftable_stack_reload(add->stack);
done:
reftable_addition_close(add);
return err;
}
int reftable_stack_new_addition(struct reftable_addition **dest,
struct reftable_stack *st)
{
int err = 0;
struct reftable_addition empty = REFTABLE_ADDITION_INIT;
*dest = reftable_calloc(sizeof(**dest));
**dest = empty;
err = reftable_stack_init_addition(*dest, st);
if (err) {
reftable_free(*dest);
*dest = NULL;
}
return err;
}
static int stack_try_add(struct reftable_stack *st,
int (*write_table)(struct reftable_writer *wr,
void *arg),
void *arg)
{
struct reftable_addition add = REFTABLE_ADDITION_INIT;
int err = reftable_stack_init_addition(&add, st);
if (err < 0)
goto done;
if (err > 0) {
err = REFTABLE_LOCK_ERROR;
goto done;
}
err = reftable_addition_add(&add, write_table, arg);
if (err < 0)
goto done;
err = reftable_addition_commit(&add);
done:
reftable_addition_close(&add);
return err;
}
int reftable_addition_add(struct reftable_addition *add,
int (*write_table)(struct reftable_writer *wr,
void *arg),
void *arg)
{
struct strbuf temp_tab_file_name = STRBUF_INIT;
struct strbuf tab_file_name = STRBUF_INIT;
struct strbuf next_name = STRBUF_INIT;
struct reftable_writer *wr = NULL;
int err = 0;
int tab_fd = 0;
strbuf_reset(&next_name);
format_name(&next_name, add->next_update_index, add->next_update_index);
stack_filename(&temp_tab_file_name, add->stack, next_name.buf);
strbuf_addstr(&temp_tab_file_name, ".temp.XXXXXX");
tab_fd = mkstemp(temp_tab_file_name.buf);
if (tab_fd < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
if (add->stack->config.default_permissions) {
if (chmod(temp_tab_file_name.buf, add->stack->config.default_permissions)) {
err = REFTABLE_IO_ERROR;
goto done;
}
}
wr = reftable_new_writer(reftable_fd_write, &tab_fd,
&add->stack->config);
err = write_table(wr, arg);
if (err < 0)
goto done;
err = reftable_writer_close(wr);
if (err == REFTABLE_EMPTY_TABLE_ERROR) {
err = 0;
goto done;
}
if (err < 0)
goto done;
err = close(tab_fd);
tab_fd = 0;
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
err = stack_check_addition(add->stack, temp_tab_file_name.buf);
if (err < 0)
goto done;
if (wr->min_update_index < add->next_update_index) {
err = REFTABLE_API_ERROR;
goto done;
}
format_name(&next_name, wr->min_update_index, wr->max_update_index);
strbuf_addstr(&next_name, ".ref");
stack_filename(&tab_file_name, add->stack, next_name.buf);
/*
On windows, this relies on rand() picking a unique destination name.
Maybe we should do retry loop as well?
*/
err = rename(temp_tab_file_name.buf, tab_file_name.buf);
if (err < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
add->new_tables = reftable_realloc(add->new_tables,
sizeof(*add->new_tables) *
(add->new_tables_len + 1));
add->new_tables[add->new_tables_len] = strbuf_detach(&next_name, NULL);
add->new_tables_len++;
done:
if (tab_fd > 0) {
close(tab_fd);
tab_fd = 0;
}
if (temp_tab_file_name.len > 0) {
unlink(temp_tab_file_name.buf);
}
strbuf_release(&temp_tab_file_name);
strbuf_release(&tab_file_name);
strbuf_release(&next_name);
reftable_writer_free(wr);
return err;
}
uint64_t reftable_stack_next_update_index(struct reftable_stack *st)
{
int sz = st->merged->stack_len;
if (sz > 0)
return reftable_reader_max_update_index(st->readers[sz - 1]) +
1;
return 1;
}
static int stack_compact_locked(struct reftable_stack *st, int first, int last,
struct strbuf *temp_tab,
struct reftable_log_expiry_config *config)
{
struct strbuf next_name = STRBUF_INIT;
int tab_fd = -1;
struct reftable_writer *wr = NULL;
int err = 0;
format_name(&next_name,
reftable_reader_min_update_index(st->readers[first]),
reftable_reader_max_update_index(st->readers[last]));
stack_filename(temp_tab, st, next_name.buf);
strbuf_addstr(temp_tab, ".temp.XXXXXX");
tab_fd = mkstemp(temp_tab->buf);
wr = reftable_new_writer(reftable_fd_write, &tab_fd, &st->config);
err = stack_write_compact(st, wr, first, last, config);
if (err < 0)
goto done;
err = reftable_writer_close(wr);
if (err < 0)
goto done;
err = close(tab_fd);
tab_fd = 0;
done:
reftable_writer_free(wr);
if (tab_fd > 0) {
close(tab_fd);
tab_fd = 0;
}
if (err != 0 && temp_tab->len > 0) {
unlink(temp_tab->buf);
strbuf_release(temp_tab);
}
strbuf_release(&next_name);
return err;
}
static int stack_write_compact(struct reftable_stack *st,
struct reftable_writer *wr, int first, int last,
struct reftable_log_expiry_config *config)
{
int subtabs_len = last - first + 1;
struct reftable_table *subtabs = reftable_calloc(
sizeof(struct reftable_table) * (last - first + 1));
struct reftable_merged_table *mt = NULL;
int err = 0;
struct reftable_iterator it = { NULL };
struct reftable_ref_record ref = { NULL };
struct reftable_log_record log = { NULL };
uint64_t entries = 0;
int i = 0, j = 0;
for (i = first, j = 0; i <= last; i++) {
struct reftable_reader *t = st->readers[i];
reftable_table_from_reader(&subtabs[j++], t);
st->stats.bytes += t->size;
}
reftable_writer_set_limits(wr, st->readers[first]->min_update_index,
st->readers[last]->max_update_index);
err = reftable_new_merged_table(&mt, subtabs, subtabs_len,
st->config.hash_id);
if (err < 0) {
reftable_free(subtabs);
goto done;
}
err = reftable_merged_table_seek_ref(mt, &it, "");
if (err < 0)
goto done;
while (1) {
err = reftable_iterator_next_ref(&it, &ref);
if (err > 0) {
err = 0;
break;
}
if (err < 0) {
break;
}
if (first == 0 && reftable_ref_record_is_deletion(&ref)) {
continue;
}
err = reftable_writer_add_ref(wr, &ref);
if (err < 0) {
break;
}
entries++;
}
reftable_iterator_destroy(&it);
err = reftable_merged_table_seek_log(mt, &it, "");
if (err < 0)
goto done;
while (1) {
err = reftable_iterator_next_log(&it, &log);
if (err > 0) {
err = 0;
break;
}
if (err < 0) {
break;
}
if (first == 0 && reftable_log_record_is_deletion(&log)) {
continue;
}
if (config && config->min_update_index > 0 &&
log.update_index < config->min_update_index) {
continue;
}
if (config && config->time > 0 &&
log.value.update.time < config->time) {
continue;
}
err = reftable_writer_add_log(wr, &log);
if (err < 0) {
break;
}
entries++;
}
done:
reftable_iterator_destroy(&it);
if (mt) {
merged_table_release(mt);
reftable_merged_table_free(mt);
}
reftable_ref_record_release(&ref);
reftable_log_record_release(&log);
st->stats.entries_written += entries;
return err;
}
/* < 0: error. 0 == OK, > 0 attempt failed; could retry. */
static int stack_compact_range(struct reftable_stack *st, int first, int last,
struct reftable_log_expiry_config *expiry)
{
struct strbuf temp_tab_file_name = STRBUF_INIT;
struct strbuf new_table_name = STRBUF_INIT;
struct strbuf lock_file_name = STRBUF_INIT;
struct strbuf ref_list_contents = STRBUF_INIT;
struct strbuf new_table_path = STRBUF_INIT;
int err = 0;
int have_lock = 0;
int lock_file_fd = -1;
int compact_count = last - first + 1;
char **listp = NULL;
char **delete_on_success =
reftable_calloc(sizeof(char *) * (compact_count + 1));
char **subtable_locks =
reftable_calloc(sizeof(char *) * (compact_count + 1));
int i = 0;
int j = 0;
int is_empty_table = 0;
if (first > last || (!expiry && first == last)) {
err = 0;
goto done;
}
st->stats.attempts++;
strbuf_reset(&lock_file_name);
strbuf_addstr(&lock_file_name, st->list_file);
strbuf_addstr(&lock_file_name, ".lock");
lock_file_fd =
open(lock_file_name.buf, O_EXCL | O_CREAT | O_WRONLY, 0666);
if (lock_file_fd < 0) {
if (errno == EEXIST) {
err = 1;
} else {
err = REFTABLE_IO_ERROR;
}
goto done;
}
/* Don't want to write to the lock for now. */
close(lock_file_fd);
lock_file_fd = -1;
have_lock = 1;
err = stack_uptodate(st);
if (err != 0)
goto done;
for (i = first, j = 0; i <= last; i++) {
struct strbuf subtab_file_name = STRBUF_INIT;
struct strbuf subtab_lock = STRBUF_INIT;
int sublock_file_fd = -1;
stack_filename(&subtab_file_name, st,
reader_name(st->readers[i]));
strbuf_reset(&subtab_lock);
strbuf_addbuf(&subtab_lock, &subtab_file_name);
strbuf_addstr(&subtab_lock, ".lock");
sublock_file_fd = open(subtab_lock.buf,
O_EXCL | O_CREAT | O_WRONLY, 0666);
if (sublock_file_fd >= 0) {
close(sublock_file_fd);
} else if (sublock_file_fd < 0) {
if (errno == EEXIST) {
err = 1;
} else {
err = REFTABLE_IO_ERROR;
}
}
subtable_locks[j] = subtab_lock.buf;
delete_on_success[j] = subtab_file_name.buf;
j++;
if (err != 0)
goto done;
}
err = unlink(lock_file_name.buf);
if (err < 0)
goto done;
have_lock = 0;
err = stack_compact_locked(st, first, last, &temp_tab_file_name,
expiry);
/* Compaction + tombstones can create an empty table out of non-empty
* tables. */
is_empty_table = (err == REFTABLE_EMPTY_TABLE_ERROR);
if (is_empty_table) {
err = 0;
}
if (err < 0)
goto done;
lock_file_fd =
open(lock_file_name.buf, O_EXCL | O_CREAT | O_WRONLY, 0666);
if (lock_file_fd < 0) {
if (errno == EEXIST) {
err = 1;
} else {
err = REFTABLE_IO_ERROR;
}
goto done;
}
have_lock = 1;
if (st->config.default_permissions) {
if (chmod(lock_file_name.buf, st->config.default_permissions) < 0) {
err = REFTABLE_IO_ERROR;
goto done;
}
}
format_name(&new_table_name, st->readers[first]->min_update_index,
st->readers[last]->max_update_index);