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/*
Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#include "booster-fd.h"
#include <logging.h>
#include <mem-pool.h>
#include <stdlib.h>
#include <errno.h>
#include <common-utils.h>
#include <string.h>
#include <assert.h>
extern fd_t *
fd_ref (fd_t *fd);
extern void
fd_unref (fd_t *fd);
/*
Allocate in memory chunks of power of 2 starting from 1024B
Assumes fdtable->lock is held
*/
static inline uint
gf_roundup_power_of_two (uint nr)
{
uint result = 1;
if (nr < 0) {
gf_log ("server-protocol/fd",
GF_LOG_ERROR,
"Negative number passed");
return -1;
}
while (result <= nr)
result *= 2;
return result;
}
int
booster_fdtable_expand (booster_fdtable_t *fdtable, uint nr)
{
fd_t **oldfds = NULL;
uint oldmax_fds = -1;
uint cpy = 0;
int32_t ret = -1;
if (fdtable == NULL || nr < 0) {
gf_log ("fd", GF_LOG_ERROR, "invalid argument");
errno = EINVAL;
ret = -1;
goto out;
}
nr /= (1024 / sizeof (fd_t *));
nr = gf_roundup_power_of_two (nr + 1);
nr *= (1024 / sizeof (fd_t *));
oldfds = fdtable->fds;
oldmax_fds = fdtable->max_fds;
fdtable->fds = CALLOC (nr, sizeof (fd_t *));
if (fdtable->fds == NULL) {
fdtable->fds = oldfds;
oldfds = NULL;
ret = -1;
goto out;
}
fdtable->max_fds = nr;
if (oldfds) {
cpy = oldmax_fds * sizeof (fd_t *);
memcpy (fdtable->fds, oldfds, cpy);
}
ret = 0;
out:
FREE (oldfds);
return ret;
}
booster_fdtable_t *
booster_fdtable_alloc (void)
{
booster_fdtable_t *fdtable = NULL;
int32_t ret = -1;
fdtable = CALLOC (1, sizeof (*fdtable));
GF_VALIDATE_OR_GOTO ("booster-fd", fdtable, out);
LOCK_INIT (&fdtable->lock);
LOCK (&fdtable->lock);
{
ret = booster_fdtable_expand (fdtable, 0);
}
UNLOCK (&fdtable->lock);
if (ret == -1) {
FREE (fdtable);
fdtable = NULL;
}
out:
return fdtable;
}
fd_t **
__booster_fdtable_get_all_fds (booster_fdtable_t *fdtable, uint *count)
{
fd_t **fds = NULL;
if (count == NULL)
goto out;
fds = fdtable->fds;
fdtable->fds = calloc (fdtable->max_fds, sizeof (fd_t *));
*count = fdtable->max_fds;
out:
return fds;
}
fd_t **
booster_fdtable_get_all_fds (booster_fdtable_t *fdtable, uint *count)
{
fd_t **fds = NULL;
if (!fdtable)
return NULL;
LOCK (&fdtable->lock);
{
fds = __booster_fdtable_get_all_fds (fdtable, count);
}
UNLOCK (&fdtable->lock);
return fds;
}
void
booster_fdtable_destroy (booster_fdtable_t *fdtable)
{
fd_t *fd = NULL;
fd_t **fds = NULL;
uint fd_count = 0;
int i = 0;
if (!fdtable)
return;
LOCK (&fdtable->lock);
{
fds = __booster_fdtable_get_all_fds (fdtable, &fd_count);
FREE (fdtable->fds);
}
UNLOCK (&fdtable->lock);
if (!fds)
goto free_table;
for (i = 0; i < fd_count; i++) {
fd = fds[i];
if (fd != NULL)
fd_unref (fd);
}
FREE (fds);
free_table:
LOCK_DESTROY (&fdtable->lock);
FREE (fdtable);
}
int
booster_fd_unused_get (booster_fdtable_t *fdtable, fd_t *fdptr, int fd)
{
int ret = -1;
int error = 0;
if (fdtable == NULL || fdptr == NULL || fd < 0) {
gf_log ("fd", GF_LOG_ERROR, "invalid argument");
errno = EINVAL;
return -1;
}
LOCK (&fdtable->lock);
{
while (fdtable->max_fds < fd) {
error = 0;
error = booster_fdtable_expand (fdtable,
fdtable->max_fds + 1);
if (error) {
gf_log ("booster-fd", GF_LOG_ERROR,
"Cannot expand fdtable:%s",
strerror (error));
goto err;
}
}
if (!fdtable->fds[fd]) {
fdtable->fds[fd] = fdptr;
fd_ref (fdptr);
ret = fd;
} else
gf_log ("booster-fd", GF_LOG_ERROR, "Cannot allocate fd"
" %d (slot not empty in fdtable)", fd);
}
err:
UNLOCK (&fdtable->lock);
return ret;
}
void
booster_fd_put (booster_fdtable_t *fdtable, int fd)
{
fd_t *fdptr = NULL;
if (fdtable == NULL || fd < 0) {
gf_log ("booster-fd", GF_LOG_ERROR, "invalid argument");
return;
}
if (!(fd < fdtable->max_fds)) {
gf_log ("fd", GF_LOG_ERROR, "invalid argument");
return;
}
LOCK (&fdtable->lock);
{
fdptr = fdtable->fds[fd];
fdtable->fds[fd] = NULL;
}
UNLOCK (&fdtable->lock);
if (fdptr)
fd_unref (fdptr);
}
fd_t *
booster_fdptr_get (booster_fdtable_t *fdtable, int fd)
{
fd_t *fdptr = NULL;
if (fdtable == NULL || fd < 0) {
gf_log ("booster-fd", GF_LOG_ERROR, "invalid argument");
errno = EINVAL;
return NULL;
}
if (!(fd < fdtable->max_fds)) {
gf_log ("booster-fd", GF_LOG_ERROR, "invalid argument");
errno = EINVAL;
return NULL;
}
LOCK (&fdtable->lock);
{
fdptr = fdtable->fds[fd];
if (fdptr)
fd_ref (fdptr);
}
UNLOCK (&fdtable->lock);
return fdptr;
}
void
booster_fdptr_put (fd_t *booster_fd)
{
if (booster_fd)
fd_unref (booster_fd);
}
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