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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <utime.h>
#include <fcntl.h>
#include "flist.h"
#include "debug.h"
static struct flist *files = 0;
#define flist_foreach(__next) \
for(__next = files; __next; __next = __next->next)
enum { UNLOCKED, RDLOCKED, WRLOCKED };
static pthread_rwlock_t files_lock;
// init
void flist_init(void)
{
pthread_rwlock_init(&files_lock, 0);
}
// unlock semaphore
void flist_unlock(void)
{
if (pthread_rwlock_unlock(&files_lock) != 0) {
mhdd_debug(MHDD_DEBUG, "E error unlock flist\n");
}
mhdd_debug(MHDD_DEBUG, "< unlock flist\n");
}
// lock for read
void flist_rdlock(void)
{
pthread_rwlock_rdlock(&files_lock);
}
// lock for write
void flist_wrlock(void)
{
pthread_rwlock_wrlock(&files_lock);
}
// lock for write for locked
void flist_wrlock_locked(void)
{
pthread_rwlock_unlock(&files_lock);
pthread_rwlock_wrlock(&files_lock);
}
// add file to list
struct flist * flist_create(const char *name,
const char *real_name, int flags, int fh)
{
struct flist * add = calloc(1, sizeof(struct flist));
add->flags = flags;
add->id = 0;
add->aid = add;
add->name = strdup(name);
add->real_name = strdup(real_name);
add->fh = fh;
flist_wrlock();
add->next = files;
if (files)
files->prev = add;
files = add;
return add;
}
/* return (malloced) array for list files with name == name */
struct flist ** flist_items_by_eq_name(struct flist * info)
{
struct flist * next;
struct flist ** result;
int i = 0, count = 0;
mhdd_debug(MHDD_INFO, "flist_items_by_eq_name: %s\n", info->name);
flist_foreach(next)
count++;
if (!count)
return 0;
result=calloc(count+1, sizeof(struct flist *));
flist_foreach(next) {
if (strcmp(info->name, next->name) == 0)
result[i++] = next;
}
if (!result[0]) {
free(result);
return 0;
}
return result;
}
/* return (wr- or rdlocked) item by id */
static struct flist * item_by_id(uint64_t id, int wrlock)
{
struct flist * next;
if (wrlock)
flist_wrlock();
else
flist_rdlock();
flist_foreach(next) {
if (next->id == id)
return next;
}
flist_unlock();
return 0;
}
/* return (rdlocked) item from flist */
struct flist * flist_item_by_id(uint64_t id) {
return item_by_id(id, 0);
}
/* return (wrlocked) item from flist */
struct flist * flist_item_by_id_wrlock(uint64_t id) {
return item_by_id(id, 1);
}
/* internal function */
static void delete_item(struct flist *item, int locked)
{
struct flist *next;
switch(locked) {
case UNLOCKED:
flist_wrlock();
case RDLOCKED:
flist_wrlock_locked();
case WRLOCKED:
break;
}
flist_foreach(next) {
if (next == item) {
if (item->next)
item->next->prev = item->prev;
if (item->prev)
item->prev->next = item->next;
if (files==item)
files = item->next;
mhdd_debug(MHDD_DEBUG, "delete_item: %s (%s)\n",
item->name, item->real_name);
free(item->name);
free(item->real_name);
free(item);
break;
}
}
flist_unlock();
}
// delete from file list
void flist_delete(struct flist *item)
{
delete_item(item, UNLOCKED);
}
// delete locked file from list
void flist_delete_locked(struct flist *item)
{
delete_item(item, RDLOCKED);
}
// delete item from wrlocked list
void flist_delete_wrlocked(struct flist * item)
{
delete_item(item, WRLOCKED);
}
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