You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.2 KiB
104 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* erofs-utils/fuse/dir.c
|
|
*
|
|
* Created by Li Guifu <blucerlee@gmail.com>
|
|
*/
|
|
#include <fuse.h>
|
|
#include <fuse_opt.h>
|
|
|
|
#include "erofs/internal.h"
|
|
#include "erofs/print.h"
|
|
|
|
static int erofs_fill_dentries(struct erofs_inode *dir,
|
|
fuse_fill_dir_t filler, void *buf,
|
|
void *dblk, unsigned int nameoff,
|
|
unsigned int maxsize)
|
|
{
|
|
struct erofs_dirent *de = dblk;
|
|
const struct erofs_dirent *end = dblk + nameoff;
|
|
char namebuf[EROFS_NAME_LEN + 1];
|
|
|
|
while (de < end) {
|
|
const char *de_name;
|
|
unsigned int de_namelen;
|
|
|
|
nameoff = le16_to_cpu(de->nameoff);
|
|
de_name = (char *)dblk + nameoff;
|
|
|
|
/* the last dirent in the block? */
|
|
if (de + 1 >= end)
|
|
de_namelen = strnlen(de_name, maxsize - nameoff);
|
|
else
|
|
de_namelen = le16_to_cpu(de[1].nameoff) - nameoff;
|
|
|
|
/* a corrupted entry is found */
|
|
if (nameoff + de_namelen > maxsize ||
|
|
de_namelen > EROFS_NAME_LEN) {
|
|
erofs_err("bogus dirent @ nid %llu", dir->nid | 0ULL);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
memcpy(namebuf, de_name, de_namelen);
|
|
namebuf[de_namelen] = '\0';
|
|
|
|
filler(buf, namebuf, NULL, 0);
|
|
++de;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int erofsfuse_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
|
|
off_t offset, struct fuse_file_info *fi)
|
|
{
|
|
int ret;
|
|
struct erofs_inode dir;
|
|
char dblk[EROFS_BLKSIZ];
|
|
erofs_off_t pos;
|
|
|
|
erofs_dbg("readdir:%s offset=%llu", path, (long long)offset);
|
|
|
|
ret = erofs_ilookup(path, &dir);
|
|
if (ret)
|
|
return ret;
|
|
|
|
erofs_dbg("path=%s nid = %llu", path, dir.nid | 0ULL);
|
|
|
|
if (!S_ISDIR(dir.i_mode))
|
|
return -ENOTDIR;
|
|
|
|
if (!dir.i_size)
|
|
return 0;
|
|
|
|
pos = 0;
|
|
while (pos < dir.i_size) {
|
|
unsigned int nameoff, maxsize;
|
|
struct erofs_dirent *de;
|
|
|
|
maxsize = min_t(unsigned int, EROFS_BLKSIZ,
|
|
dir.i_size - pos);
|
|
ret = erofs_pread(&dir, dblk, maxsize, pos);
|
|
if (ret)
|
|
return ret;
|
|
|
|
de = (struct erofs_dirent *)dblk;
|
|
nameoff = le16_to_cpu(de->nameoff);
|
|
if (nameoff < sizeof(struct erofs_dirent) ||
|
|
nameoff >= PAGE_SIZE) {
|
|
erofs_err("invalid de[0].nameoff %u @ nid %llu",
|
|
nameoff, dir.nid | 0ULL);
|
|
ret = -EFSCORRUPTED;
|
|
break;
|
|
}
|
|
|
|
ret = erofs_fill_dentries(&dir, filler, buf,
|
|
dblk, nameoff, maxsize);
|
|
if (ret)
|
|
break;
|
|
pos += maxsize;
|
|
}
|
|
return 0;
|
|
}
|
|
|