static int dfs_uffs_unlink(struct dfs_filesystem* fs, const char* path)
{
int result;
struct uffs_stat s;
/* judge file type, dir is to be delete by uffs_rmdir, others by uffs_remove */
if (uffs_lstat(path, &s) < 0)
{
return uffs_result_to_dfs(uffs_get_error());
}
switch(s.st_mode & US_IFMT)
{
case US_IFREG:
result = uffs_remove(path);
break;
case US_IFDIR:
result = uffs_rmdir(path);
break;
default:
/* unknown file type */
return -1;
}
if (result < 0)
return uffs_result_to_dfs(uffs_get_error());
return 0;
}
static int dfs_uffs_seek(struct dfs_fd* file,
rt_off_t offset)
{
int result;
/* set offset as current offset */
if (file->type == FT_DIRECTORY)
{
uffs_rewinddir((uffs_DIR *)(file->data));
result = uffs_seekdir((uffs_DIR *)(file->data), offset/sizeof(struct dirent));
if (result >= 0)
{
file->pos = offset;
return offset;
}
}
else if (file->type == FT_REGULAR)
{
result = uffs_seek((int)(file->data), offset, USEEK_SET);
if (result >= 0)
return offset;
}
return uffs_result_to_dfs(uffs_get_error());
}
static int dfs_uffs_flush(struct dfs_fd* file)
{
int fd;
int result;
fd = (int)(file->data);
result = uffs_flush(fd);
if (result < 0 )
return uffs_result_to_dfs(uffs_get_error());
return 0;
}
static int dfs_uffs_rename(
struct dfs_filesystem* fs,
const char* oldpath,
const char* newpath)
{
int result;
result = uffs_rename(oldpath, newpath);
if (result < 0)
return uffs_result_to_dfs(uffs_get_error());
return 0;
}
static int dfs_uffs_close(struct dfs_fd* file)
{
int oflag;
int fd;
oflag = file->flags;
if (oflag & DFS_O_DIRECTORY)
{
/* operations about dir */
if (uffs_closedir((uffs_DIR *)(file->data)) < 0)
return uffs_result_to_dfs(uffs_get_error());
return 0;
}
/* regular file operations */
fd = (int)(file->data);
if (uffs_close(fd) == 0)
return 0;
return uffs_result_to_dfs(uffs_get_error());
}
static int dfs_uffs_read(struct dfs_fd * file, void* buf, rt_size_t len)
{
int fd;
int char_read;
fd = (int)(file->data);
char_read = uffs_read(fd, buf, len);
if (char_read < 0)
return uffs_result_to_dfs(uffs_get_error());
/* update position */
file->pos = uffs_seek(fd, 0, USEEK_CUR);
return char_read;
}
static int dfs_uffs_write(struct dfs_fd* file,
const void* buf,
size_t len)
{
int fd;
int char_write;
fd = (int)(file->data);
char_write = uffs_write(fd, buf, len);
if (char_write < 0)
return uffs_result_to_dfs(uffs_get_error());
/* update position */
file->pos = uffs_seek(fd, 0, USEEK_CUR);
return char_write;
}
static int dfs_uffs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
{
int result;
struct uffs_stat s;
result = uffs_stat(path, &s);
if (result < 0)
return uffs_result_to_dfs(uffs_get_error());
/* convert uffs stat to dfs stat structure */
/* FIXME, these field may not be the same */
st->st_dev = 0;
st->st_mode = s.st_mode;
st->st_size = s.st_size;
st->st_mtime = s.st_mtime;
return 0;
}
static int dfs_uffs_mkfs(const char* device_name)
{
rt_base_t index;
rt_uint32_t block;
struct rt_mtd_nand_device * mtd;
/*1. find the device index */
for (index = 0; index < UFFS_DEVICE_MAX; index++)
{
if (rt_strncmp(nand_part[index].dev->parent.parent.name,
device_name, RT_NAME_MAX) == 0)
break;
}
if (index == UFFS_DEVICE_MAX)
{
/* can't find device driver */
rt_kprintf("can not find device driver: %s\n", device_name);
return -DFS_STATUS_ENOENT;
}
/*2. then unmount the partition */
uffs_Mount(nand_part[index].mount_path);
mtd = nand_part[index].dev;
/*3. erase all blocks on the partition */
block = mtd->block_start;
for (; block <= mtd->block_end; block++)
{
rt_mtd_nand_erase_block(mtd, block);
if (rt_mtd_nand_check_block(mtd, block) != RT_EOK)
{
rt_kprintf("found bad block %d\n", block);
rt_mtd_nand_mark_badblock(mtd, block);
}
}
/*4. remount it */
if (init_uffs_fs(&nand_part[index]) < 0)
{
return uffs_result_to_dfs(uffs_get_error());
}
return DFS_STATUS_OK;
}
static int dfs_uffs_mount(
struct dfs_filesystem* fs,
unsigned long rwflag,
const void* data)
{
rt_base_t index;
uffs_MountTable * mount_part;
struct rt_mtd_nand_device * dev;
RT_ASSERT(rt_strlen(fs->path) < (UFFS_MOUNT_PATH_MAX-1));
dev = RT_MTD_NAND_DEVICE(fs->dev_id);
/*1. find a empty entry in partition table */
for (index = 0; index < UFFS_DEVICE_MAX ; index ++)
{
if (nand_part[index].dev == RT_NULL)
break;
}
if (index == UFFS_DEVICE_MAX)
return -DFS_STATUS_ENOENT;
/*2. fill partition structure */
nand_part[index].dev = dev;
/* make a right mount path for uffs, end with '/' */
rt_snprintf(nand_part[index].mount_path, UFFS_MOUNT_PATH_MAX, "%s/", fs->path);
if (nand_part[index].mount_path[1] == '/')
nand_part[index].mount_path[1] = 0;
mount_part = &(nand_part[index].mount_table);
mount_part->mount = nand_part[index].mount_path;
mount_part->dev = &(nand_part[index].uffs_dev);
rt_memset(mount_part->dev, 0, sizeof(uffs_Device));//in order to make uffs happy.
mount_part->dev->_private = dev; /* save dev_id into uffs */
mount_part->start_block = dev->block_start;
mount_part->end_block = dev->block_end;
/*3. mount uffs */
if (init_uffs_fs(&nand_part[index]) < 0)
{
return uffs_result_to_dfs(uffs_get_error());
}
return 0;
}
static int dfs_uffs_mkfs(rt_device_t dev_id)
{
rt_base_t index;
rt_uint32_t block;
struct rt_mtd_nand_device * mtd;
/*1. find the device index */
for (index = 0; index < UFFS_DEVICE_MAX; index++)
{
if (nand_part[index].dev == (struct rt_mtd_nand_device *)dev_id)
break;
}
if (index == UFFS_DEVICE_MAX)
{
/* can't find device driver */
return -ENOENT;
}
/*2. then unmount the partition */
uffs_Mount(nand_part[index].mount_path);
mtd = nand_part[index].dev;
/*3. erase all blocks on the partition */
block = mtd->block_start;
for (; block <= mtd->block_end; block++)
{
rt_mtd_nand_erase_block(mtd, block);
if (rt_mtd_nand_check_block(mtd, block) != RT_EOK)
{
rt_kprintf("found bad block %d\n", block);
rt_mtd_nand_mark_badblock(mtd, block);
}
}
/*4. remount it */
if (init_uffs_fs(&nand_part[index]) < 0)
{
return uffs_result_to_dfs(uffs_get_error());
}
return RT_EOK;
}
static int dfs_uffs_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
{
int result;
struct uffs_stat s;
struct rt_mtd_nand_device * mtd;
result = uffs_stat(path, &s);
if (result < 0)
return uffs_result_to_dfs(uffs_get_error());
/* convert uffs stat to dfs stat structure */
/* FIXME, these field may not be the same */
st->st_dev = 0;
st->st_mode = s.st_mode;
st->st_size = s.st_size;
st->st_mtime = s.st_mtime;
mtd = RT_MTD_NAND_DEVICE(fs->dev_id);
st->st_blksize = mtd->page_size;
return 0;
}
/* return the size of struct dirent*/
static int dfs_uffs_getdents(
struct dfs_fd* file,
struct dirent* dirp,
rt_uint32_t count)
{
rt_uint32_t index;
char * file_path;
struct dirent* d;
uffs_DIR* dir;
struct uffs_dirent * uffs_d;
dir = (uffs_DIR*)(file->data);
RT_ASSERT(dir != RT_NULL);
/* round count, count is always 1 */
count = (count / sizeof(struct dirent)) * sizeof(struct dirent);
if (count == 0) return -DFS_STATUS_EINVAL;
/* allocate file name */
file_path = rt_malloc(FILE_PATH_MAX);
if (file_path == RT_NULL)
return -DFS_STATUS_ENOMEM;
index = 0;
/* usually, the while loop should only be looped only once! */
while (1)
{
struct uffs_stat s;
d = dirp + index;
uffs_d = uffs_readdir(dir);
if (uffs_d == RT_NULL)
{
rt_free(file_path);
return (uffs_result_to_dfs(uffs_get_error()));
}
if (file->path[0] == '/' && !(file->path[1] == 0))
rt_snprintf(file_path, FILE_PATH_MAX, "%s/%s", file->path, uffs_d->d_name);
else
rt_strncpy(file_path, uffs_d->d_name, FILE_PATH_MAX);
uffs_stat(file_path, &s);
switch(s.st_mode & US_IFMT) /* file type mark */
{
case US_IFREG: /* directory */
d->d_type = DFS_DT_REG;
break;
case US_IFDIR: /* regular file */
d->d_type = DFS_DT_DIR;
break;
case US_IFLNK: /* symbolic link */
case US_IREAD: /* read permission */
case US_IWRITE:/* write permission */
default:
d->d_type = DFS_DT_UNKNOWN;
break;
}
/* write the rest args of struct dirent* dirp */
d->d_namlen = rt_strlen(uffs_d->d_name);
d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
rt_strncpy(d->d_name, uffs_d->d_name, rt_strlen(uffs_d->d_name) + 1);
index ++;
if (index * sizeof(struct dirent) >= count)
break;
}
/* free file name buf */
rt_free(file_path);
if (index == 0)
return uffs_result_to_dfs(uffs_get_error());
file->pos += index * sizeof(struct dirent);
return index * sizeof(struct dirent);
}
static int dfs_uffs_open(struct dfs_fd* file)
{
int fd;
int oflag, mode;
char * file_path;
oflag = file->flags;
if (oflag & DFS_O_DIRECTORY) /* operations about dir */
{
uffs_DIR * dir;
if (oflag & DFS_O_CREAT) /* create a dir*/
{
if (uffs_mkdir(file->path) < 0)
return uffs_result_to_dfs(uffs_get_error());
}
/* open dir */
file_path = rt_malloc(FILE_PATH_MAX);
if(file_path == RT_NULL)
return -DFS_STATUS_ENOMEM;
if (file->path[0] == '/' && !(file->path[1] == 0))
rt_snprintf(file_path, FILE_PATH_MAX, "%s/", file->path);
else
{
file_path[0] = '/';
file_path[1] = 0;
}
dir = uffs_opendir(file_path);
if (dir == RT_NULL)
{
rt_free(file_path);
return uffs_result_to_dfs(uffs_get_error());
}
/* save this pointer,will used by dfs_uffs_getdents*/
file->data = dir;
rt_free(file_path);
return DFS_STATUS_OK;
}
/* regular file operations */
/* int uffs_open(const char *name, int oflag, ...); what is this?
* uffs_open can open dir!! **/
mode = 0;
if (oflag & DFS_O_RDONLY) mode |= UO_RDONLY;
if (oflag & DFS_O_WRONLY) mode |= UO_WRONLY;
if (oflag & DFS_O_RDWR) mode |= UO_RDWR;
/* Opens the file, if it is existing. If not, a new file is created. */
if (oflag & DFS_O_CREAT) mode |= UO_CREATE;
/* Creates a new file. If the file is existing, it is truncated and overwritten. */
if (oflag & DFS_O_TRUNC) mode |= UO_TRUNC;
/* Creates a new file. The function fails if the file is already existing. */
if (oflag & DFS_O_EXCL) mode |= UO_EXCL;
fd = uffs_open(file->path, mode);
if (fd < 0)
{
return uffs_result_to_dfs(uffs_get_error());
}
/* save this pointer, it will be used when calling read()£¬write(),
* flush(), seek(), and will be free when calling close()*/
file->data = (void *)fd;
file->pos = uffs_seek(fd, 0, USEEK_CUR);
file->size = uffs_seek(fd, 0, USEEK_END);
uffs_seek(fd, file->pos, USEEK_SET);
if (oflag & DFS_O_APPEND)
{
file->pos = uffs_seek(fd, 0, USEEK_END);
}
return 0;
}