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#include "dir.h"
#include <assert.h>
#include <unistd.h>
#include <libgen.h>
#include <string.h>
#include <stdbool.h>
#include <sys/mman.h>
#include "defs.h"
#include "block_walker.h"
uint16_t dir_create(const char *disk_mem, mode_t mode)
{
uint16_t ipos = 0;
dir *d = NULL;
time_t new_time = NEW_TIME;
assert (disk_mem != NULL);
ipos = inode_allocate_block(disk_mem);
if(ipos == 0)
return 0;
d = (dir *) disk_mem + INODEPOOL_OFFSET + (ipos * INODE_SIZE);
d->uid = getuid();
d->gid = getgid();
d->mode = mode;
d->size = 0;
d->type = I_DIR;
d->nlinks = 1;
d->ctime = new_time;
d->mtime = new_time;
d->atime = new_time;
return (ipos);
}
uint16_t dir_add_direntry(const char *disk_mem, dir *d, const char *name,
uint16_t inumber, uint16_t sym)
{
bwalker *walker = NULL;
uint16_t block = 0;
direntry *dentry = NULL;
uint16_t i = 0;
int result = 0;
assert (disk_mem != NULL);
assert (d != NULL);
assert (name != NULL);
assert (strlen(name) < NAME_LENGTH);
walker = bwalker_create(disk_mem, d->size, &(d->indirect));
if(bwalker_direct_length(walker)*BLOCK_SIZE<d->size+32){
block = bwalker_allocate_block(walker);
}else{
block = bwalker_last_block(walker);
if(!block)
goto CLEAN;
}
dentry = (direntry *) disk_mem + BLOCKPOOL_OFFSET + (block * BLOCK_SIZE);
for(i = 0; i < 16; i++){
if(strcmp(dentry[i].name, "\0") == 0){
d->size += sizeof(direntry); /* Deberia ser 32*/
dentry = &(dentry[i]);
strcpy(dentry->name, name);
dentry->inum = inumber;
dentry->symlink = sym;
result = 1;
goto CLEAN;
}
}
CLEAN:
bwalker_destroy(walker);
return result;
}
uint16_t dir_remove_direntry(const char *disk_mem, dir *d, const char *name)
{
bwalker *walker = NULL;
uint16_t result = 0;
uint16_t block = 0;
direntry *rm_dentry = NULL;
direntry *last_dentry = NULL;
uint16_t i;
assert(disk_mem != NULL);
assert(d != NULL);
assert(name != NULL);
assert(strlen(name) < NAME_LENGTH);
walker = bwalker_create(disk_mem, d->size, &(d->indirect));
/* Conseguimos el ultimo direntry */
block = bwalker_last_block(walker);
assert(block != 0);
last_dentry = (direntry *) disk_mem + BLOCKPOOL_OFFSET +
(block * BLOCK_SIZE);
assert(last_dentry[0].inum != 0);
for(i = 0; i < 16; i++){
if(last_dentry[i].inum == 0)
break;
}
assert(i > 0);
last_dentry = &(last_dentry[i-1]);
while((block = bwalker_next(walker)))
{
rm_dentry = (direntry *) disk_mem + BLOCKPOOL_OFFSET +
(block * BLOCK_SIZE);
for(i = 0; i < 16; i++)
if(strcmp(name, rm_dentry[i].name) == 0)
{
/* Retornamos esto para eliminarlo fuera. */
result = rm_dentry[i].inum;
/* Copiamos a la nueva posicion para ahorrarnos la
* fragmentacion externa. */
strcpy(rm_dentry[i].name, last_dentry->name);
rm_dentry[i].inum = last_dentry->inum;
rm_dentry[i].symlink = last_dentry->symlink;
/* Borramos los contenidos del ultimo. */
last_dentry->name[0] = '\0';
last_dentry->inum = 0;
last_dentry->symlink = 0;
goto END;
}
if(bwalker_block_is_last(walker))
break;
}
END:
bwalker_destroy(walker);
return result;
}
dir *dir_get_from_path(const char *disk_mem, const char *path)
{
uint16_t inum = 0;
char *dir_name = NULL;
assert (disk_mem != NULL);
assert (path != NULL);
dir_name = calloc(strlen(path) + 1, sizeof(char));
strcpy(dir_name, path);
inum = get_inode_from_path(disk_mem, dirname(dir_name), 1);
free(dir_name);
if(inum==0){
return NULL;
}
return ((dir *)disk_mem+INODEPOOL_OFFSET+INODE_SIZE*inum);
}
uint16_t dir_search(const char *disk_mem, dir *idir,const char *name)
{
bwalker *bw = NULL;
direntry *dentry;
uint16_t bnum, i;
assert(disk_mem != NULL);
assert(idir != NULL);
assert(name != NULL);
assert(strcmp(name, ""));
/* Salimos si esto esta vacio obviamente. */
if(idir->size == 0){
return 0;
}
bw = bwalker_create(disk_mem, idir->size, &(idir->indirect));
while ((bnum = bwalker_next(bw)))
{
dentry=(direntry *) disk_mem + BLOCKPOOL_OFFSET + (bnum*BLOCK_SIZE);
for(i=0; i<16; i++){
if(strcmp(name, dentry[i].name) == 0){
bwalker_destroy(bw);
return dentry[i].inum;
}
}
if(bwalker_block_is_last(bw))
break;
}
bwalker_destroy(bw);
return 0;
}
int dir_rename_inode(const char *disk_mem, dir *d,
const char *old_name, const char *new_name)
{
bwalker *bw = NULL;
direntry *dentry;
uint16_t i;
uint16_t bnum;
assert(disk_mem != NULL);
assert(d != NULL);
assert(strcmp(old_name, ""));
assert(new_name != NULL);
assert(old_name != NULL);
assert(strlen(new_name) < NAME_LENGTH);
/* Salimos si esto esta vacio obviamente. */
if(d->size == 0){
return 0;
}
bw = bwalker_create(disk_mem, d->size, &(d->indirect));
while ((bnum = bwalker_next(bw)))
{
dentry=(direntry *) disk_mem + BLOCKPOOL_OFFSET + (bnum*BLOCK_SIZE);
for(i=0; i<16; i++){
if(strcmp(old_name, dentry[i].name) == 0){
bwalker_destroy(bw);
strcpy(dentry[i].name,new_name);
return 1;
}
}
if(bwalker_block_is_last(bw))
break;
}
bwalker_destroy(bw);
return 0;
}
uint16_t dir_readdir(const char *disk_mem, dir *d, void *buf,
fuse_fill_dir_t filler)
{
bwalker *bw = NULL;
direntry *dentry;
uint16_t bnum, i;
assert(disk_mem != NULL);
assert(d != NULL);
/* Salimos si esto esta vacio obviamente. */
if(d->size == 0)
return 0;
bw = bwalker_create(disk_mem, d->size, &(d->indirect));
while ((bnum = bwalker_next(bw))){
dentry=(direntry *) disk_mem + BLOCKPOOL_OFFSET + (bnum*BLOCK_SIZE);
for(i=0; i<16 && dentry[i].name[0] != '\0' ; i++){
filler(buf, (const char *)&(dentry[i].name), NULL, 0);
}
if(bwalker_block_is_last(bw))
break;
}
bwalker_destroy(bw);
return 0;
}
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