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rt-thread-official/components/dfs/src/dfs_fs.c

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/*
* File : dfs_fs.c
* This file is part of Device File System in RT-Thread RTOS
* COPYRIGHT (C) 2004-2012, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE.
*
* Change Logs:
* Date Author Notes
* 2005-02-22 Bernard The first version.
* 2010-06-30 Bernard Optimize for RT-Thread RTOS
* 2011-03-12 Bernard fix the filesystem lookup issue.
*/
#include <dfs_fs.h>
#include <dfs_file.h>
/**
* @addtogroup FsApi
*/
/*@{*/
/**
* this function will register a file system instance to device file system.
*
* @param ops the file system instance to be registered.
*
* @return 0 on successful, -1 on failed.
*/
int dfs_register(const struct dfs_filesystem_operation *ops)
{
int index, result;
int free_index;
result = 0;
free_index = DFS_FILESYSTEM_TYPES_MAX;
/* lock filesystem */
dfs_lock();
/* check if this filesystem was already registered */
for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
{
if (filesystem_operation_table[index] == RT_NULL)
{
/* find out an empty filesystem type entry */
if (free_index == DFS_FILESYSTEM_TYPES_MAX)
free_index = index;
}
else if (strcmp(filesystem_operation_table[index]->name, ops->name) == 0)
{
result = -1;
goto err;
}
}
/* filesystem type table full */
if (free_index == DFS_FILESYSTEM_TYPES_MAX)
{
result = -1;
goto err;
}
/* save the filesystem's operations */
filesystem_operation_table[free_index] = ops;
err:
dfs_unlock();
return result;
}
/**
* this function will return the file system mounted on specified path.
*
* @param path the specified path string.
*
* @return the found file system or NULL if no file system mounted on
* specified path
*/
struct dfs_filesystem *dfs_filesystem_lookup(const char *path)
{
struct dfs_filesystem *fs;
rt_uint32_t index, fspath, prefixlen;
fs = RT_NULL;
prefixlen = 0;
/* lock filesystem */
dfs_lock();
/* lookup it in the filesystem table */
for (index = 0; index < DFS_FILESYSTEMS_MAX; index++)
{
if (filesystem_table[index].path == RT_NULL)
continue;
else
{
fspath = strlen(filesystem_table[index].path);
if (fspath < prefixlen)
continue;
}
if ((filesystem_table[index].ops != RT_NULL) &&
(strncmp(filesystem_table[index].path, path, fspath) == 0))
{
/* check next path separator */
if (fspath > 1 && (strlen(path) > fspath) && (path[fspath] != '/'))
continue;
fs = &filesystem_table[index];
prefixlen = fspath;
}
}
dfs_unlock();
return fs;
}
/**
* this function will fetch the partition table on specified buffer.
*
* @param part the returned partition structure.
* @param buf the buffer contains partition table.
* @param pindex the index of partition table to fetch.
*
* @return RT_EOK on successful or -RT_ERROR on failed.
*/
rt_err_t dfs_filesystem_get_partition(struct dfs_partition *part,
rt_uint8_t *buf,
rt_uint32_t pindex)
{
#define DPT_ADDRESS 0x1be /* device partition offset in Boot Sector */
#define DPT_ITEM_SIZE 16 /* partition item size */
rt_uint8_t *dpt;
rt_uint8_t type;
rt_err_t result;
RT_ASSERT(part != RT_NULL);
RT_ASSERT(buf != RT_NULL);
result = RT_EOK;
dpt = buf + DPT_ADDRESS + pindex * DPT_ITEM_SIZE;
if ((*dpt != 0x80) && (*dpt != 0x00))
{
/* which is not a partition table */
result = -RT_ERROR;
return result;
}
/* get partition type */
type = *(dpt+4);
if (type != 0)
{
/* set partition type */
part->type = type;
/* get partition offset and size */
part->offset = *(dpt+8) | *(dpt+9)<<8 | *(dpt+10)<<16 | *(dpt+11)<<24;
part->size = *(dpt+12) | *(dpt+13)<<8 | *(dpt+14)<<16 | *(dpt+15)<<24;
rt_kprintf("found part[%d], begin: %d, size: ",
pindex, part->offset*512);
if ((part->size>>11) > 0) /* MB */
{
unsigned int part_size;
part_size = part->size >> 11;/* MB */
if ((part_size>>10) > 0) /* GB */
{
/* GB */
rt_kprintf("%d.%d%s",part_size>>10,part_size&0x3FF,"GB\r\n");
}
else
{
/* MB */
rt_kprintf("%d.%d%s",part_size,(part->size>>1)&0x3FF,"MB\r\n");
}
}
else
{
/* KB */
rt_kprintf("%d%s",part->size>>1,"KB\r\n");
}
}
else
{
result = -RT_ERROR;
}
return result;
}
/**
* this function will mount a file system on a specified path.
*
* @param device_name the name of device which includes a file system.
* @param path the path to mount a file system
* @param filesystemtype the file system type
* @param rwflag the read/write etc. flag.
* @param data the private data(parameter) for this file system.
*
* @return 0 on successful or -1 on failed.
*/
int dfs_mount(const char *device_name,
const char *path,
const char *filesystemtype,
unsigned long rwflag,
const void *data)
{
const struct dfs_filesystem_operation *ops;
struct dfs_filesystem *fs;
char *fullpath=RT_NULL;
rt_device_t dev_id;
int index, free_index;
/* open specific device */
if (device_name != RT_NULL)
{
dev_id = rt_device_find(device_name);
if (dev_id == RT_NULL)
{
/* no this device */
rt_set_errno(-DFS_STATUS_ENODEV);
return -1;
}
}
else
{
/* which is a non-device filesystem mount */
dev_id = RT_NULL;
}
/* find out specific filesystem */
dfs_lock();
for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index++)
{
if (filesystem_operation_table[index] == RT_NULL)
continue;
if (strcmp(filesystem_operation_table[index]->name, filesystemtype) == 0)
break;
}
dfs_unlock();
/* can't find filesystem */
if (index == DFS_FILESYSTEM_TYPES_MAX)
{
rt_set_errno(-DFS_STATUS_ENODEV);
return -1;
}
ops = filesystem_operation_table[index];
/* make full path for special file */
fullpath = dfs_normalize_path(RT_NULL, path);
if (fullpath == RT_NULL) /* not an abstract path */
{
rt_set_errno(-DFS_STATUS_ENOTDIR);
return -1;
}
/* Check if the path exists or not, raw APIs call, fixme */
if ((strcmp(fullpath, "/") != 0) && (strcmp(fullpath, "/dev") != 0))
{
struct dfs_fd fd;
if (dfs_file_open(&fd, fullpath, DFS_O_RDONLY | DFS_O_DIRECTORY) < 0)
{
rt_free(fullpath);
rt_set_errno(-DFS_STATUS_ENOTDIR);
return -1;
}
dfs_file_close(&fd);
}
free_index = DFS_FILESYSTEMS_MAX;
/* check whether the file system mounted or not */
dfs_lock();
for (index = 0; index < DFS_FILESYSTEMS_MAX; index ++)
{
if (filesystem_table[index].ops == RT_NULL)
{
/* find out an empty filesystem table entry */
if (free_index == DFS_FILESYSTEMS_MAX)
free_index = index;
}
else if (strcmp(filesystem_table[index].path, path) == 0)
{
rt_set_errno(-DFS_STATUS_EINVAL);
goto err1;
}
}
/* can't find en empty filesystem table entry */
if (free_index == DFS_FILESYSTEMS_MAX)
{
rt_set_errno(-DFS_STATUS_ENOSPC);
goto err1;
}
/* register file system */
fs = &(filesystem_table[free_index]);
fs->path = fullpath;
fs->ops = ops;
fs->dev_id = dev_id;
/* release filesystem_table lock */
dfs_unlock();
/* open device, but do not check the status of device */
if (dev_id != RT_NULL)
rt_device_open(fs->dev_id, RT_DEVICE_OFLAG_RDWR);
/* there is no mount implementation */
if (ops->mount == RT_NULL)
{
if (dev_id != RT_NULL)
rt_device_close(dev_id);
dfs_lock();
/* clear filesystem table entry */
rt_memset(fs, 0, sizeof(struct dfs_filesystem));
dfs_unlock();
rt_free(fullpath);
rt_set_errno(-DFS_STATUS_ENOSYS);
return -1;
}
/* call mount of this filesystem */
else if (ops->mount(fs, rwflag, data) < 0)
{
/* close device */
if (dev_id != RT_NULL)
rt_device_close(fs->dev_id);
/* mount failed */
dfs_lock();
/* clear filesystem table entry */
rt_memset(fs, 0, sizeof(struct dfs_filesystem));
dfs_unlock();
rt_free(fullpath);
return -1;
}
return 0;
err1:
dfs_unlock();
if (fullpath != RT_NULL)
rt_free(fullpath);
return -1;
}
/**
* this function will unmount a file system on specified path.
*
* @param specialfile the specified path which mounted a file system.
*
* @return 0 on successful or -1 on failed.
*/
int dfs_unmount(const char *specialfile)
{
char *fullpath;
struct dfs_filesystem *fs = RT_NULL;
fullpath = dfs_normalize_path(RT_NULL, specialfile);
if (fullpath == RT_NULL)
{
rt_set_errno(-DFS_STATUS_ENOTDIR);
return -1;
}
/* lock filesystem */
dfs_lock();
fs = dfs_filesystem_lookup(fullpath);
if (fs == RT_NULL ||
fs->ops->unmount == RT_NULL ||
fs->ops->unmount(fs) < 0)
{
goto err1;
}
/* close device, but do not check the status of device */
if (fs->dev_id != RT_NULL)
rt_device_close(fs->dev_id);
if (fs->path != RT_NULL)
rt_free(fs->path);
/* clear this filesystem table entry */
rt_memset(fs, 0, sizeof(struct dfs_filesystem));
dfs_unlock();
rt_free(fullpath);
return 0;
err1:
dfs_unlock();
rt_free(fullpath);
return -1;
}
/**
* make a file system on the special device
*
* @param fs_name the file system name
* @param device_name the special device name
*
* @return 0 on successful, otherwise failed.
*/
int dfs_mkfs(const char *fs_name, const char *device_name)
{
int index;
rt_device_t dev_id;
/* check device name, and it should not be NULL */
if (device_name == RT_NULL)
dev_id = RT_NULL;
else
dev_id = rt_device_find(device_name);
if (dev_id == RT_NULL)
{
rt_set_errno(-DFS_STATUS_ENODEV);
return -1;
}
/* lock file system */
dfs_lock();
/* find the file system operations */
for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index ++)
{
if (filesystem_operation_table[index] != RT_NULL &&
strcmp(filesystem_operation_table[index]->name, fs_name) == 0)
{
/* find file system operation */
const struct dfs_filesystem_operation *ops = filesystem_operation_table[index];
dfs_unlock();
if (ops->mkfs != RT_NULL)
return ops->mkfs(dev_id);
break;
}
}
dfs_unlock();
rt_kprintf("Can not find the file system which named as %s.\n", fs_name);
return -1;
}
/**
* this function will return the information about a mounted file system.
*
* @param path the path which mounted file system.
* @param buffer the buffer to save the returned information.
*
* @return 0 on successful, others on failed.
*/
int dfs_statfs(const char *path, struct statfs *buffer)
{
struct dfs_filesystem *fs;
fs = dfs_filesystem_lookup(path);
if (fs != RT_NULL)
{
if (fs->ops->statfs != RT_NULL)
return fs->ops->statfs(fs, buffer);
}
return -1;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
void mkfs(const char *fs_name, const char *device_name)
{
dfs_mkfs(fs_name, device_name);
}
FINSH_FUNCTION_EXPORT(mkfs, make a file system);
int df(const char *path)
{
int result;
long long cap;
struct statfs buffer;
if (path == RT_NULL)
result = dfs_statfs("/", &buffer);
else
result = dfs_statfs(path, &buffer);
if (result != 0)
{
rt_kprintf("dfs_statfs failed.\n");
return -1;
}
cap = buffer.f_bsize * buffer.f_bfree / 1024;
rt_kprintf("disk free: %d KB [ %d block, %d bytes per block ]\n",
(unsigned long)cap, buffer.f_bfree, buffer.f_bsize);
return 0;
}
FINSH_FUNCTION_EXPORT(df, get disk free);
#endif
/* @} */
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