/**
* this function will get file information.
*
* @param path the file path.
* @param buf the data buffer to save stat description.
*
* @return 0 on successful, -1 on failed.
*/
int dfs_file_stat(const char *path, struct stat *buf)
{
int result;
char* fullpath;
struct dfs_filesystem* fs;
fullpath = dfs_normalize_path(RT_NULL, path);
if ( fullpath == RT_NULL )
{
return -1;
}
if ((fs = dfs_filesystem_lookup(fullpath)) == RT_NULL)
{
dfs_log(DFS_DEBUG_ERROR, ("can't find mounted filesystem on this path:%s", fullpath));
rt_free(fullpath);
return -DFS_STATUS_ENOENT;
}
if (fullpath[0] == '/' && fullpath[1] == '\0')
{
/* it's the root directory */
buf->st_dev = 0;
buf->st_mode = DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
buf->st_mode |= DFS_S_IFDIR | DFS_S_IXUSR | DFS_S_IXGRP | DFS_S_IXOTH;
buf->st_size = 0;
buf->st_mtime = 0;
buf->st_blksize = 512;
/* release full path */
rt_free(fullpath);
return DFS_STATUS_OK;
}
/* get the real file path */
if (fs->ops->stat == RT_NULL)
{
rt_free(fullpath);
dfs_log(DFS_DEBUG_ERROR, ("the filesystem didn't implement this function"));
return -DFS_STATUS_ENOSYS;
}
if (dfs_subdir(fs->path, fullpath) == RT_NULL)
result = fs->ops->stat(fs, "/", buf);
else
result = fs->ops->stat(fs, dfs_subdir(fs->path, fullpath), buf);
rt_free(fullpath);
return result;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_rename(struct dfs_filesystem* fs, const char* oldpath, const char* newpath)
{
FileRecord old_entry, new_entry;
FileLocation old_loc, new_loc;
efsl_fs* efsfs;
eint8 fatfilename[11];
efsfs = (efsl_fs*) fs->data ;
RT_ASSERT(efsfs != RT_NULL);
dir_getFatFileName((eint8 *)newpath, &fatfilename[0]);
/* parameters check */
if (strlen(oldpath) > DFS_PATH_MAX ||
strlen(newpath) > DFS_PATH_MAX ||
/* old path is a directory that contains newpath */
strncmp(oldpath, newpath, strlen(newpath)) == 0)
{
dfs_log(DFS_DEBUG_ERROR, ("old path is a directory that contains newpath"));
return -DFS_STATUS_EINVAL;
}
/* if can't find old direntry */
if(fs_findFile(&efsfs->filesystem, (eint8 *)oldpath, &old_loc, 0) == 0)
{
dfs_log(DFS_DEBUG_ERROR, ("can't find old direntry"));
return -DFS_STATUS_ENOENT;
}
dir_getFileStructure(&efsfs->filesystem, &old_entry, &old_loc);
/* if the new direntry exist */
if(fs_findFile(&efsfs->filesystem, (eint8 *)newpath, &new_loc, 0) > 0)
{
dfs_log(DFS_DEBUG_ERROR, ("new direntry existed"));
return -DFS_STATUS_ENOENT;
}
if(fs_findFreeFile(&efsfs->filesystem, (eint8 *)newpath, &new_loc, 0))
{
memCpy(&old_entry, &new_entry, sizeof(FileRecord));
memCpy(fatfilename, new_entry.FileName, 11);
dir_createDirectoryEntry(&efsfs->filesystem, &new_entry, &new_loc);
}
/* delete the old direntry */
old_entry.FileName[0] = 0xe5;
dir_updateDirectoryEntry(&efsfs->filesystem, &old_entry, &old_loc);
return 0;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_stat(struct dfs_filesystem* fs, const char *path, struct dfs_stat *st)
{
FileRecord entry;
FileLocation loc;
efsl_fs* efsfs = (efsl_fs*)(fs->data);
/* parameter check */
RT_ASSERT(efsfs != RT_NULL);
/* file does not exist */
if(fs_findFile(&efsfs->filesystem, (char *)path, &loc, 0) == 0)
{
dfs_log(DFS_DEBUG_ERROR, ("can't find direntry"));
return -DFS_STATUS_ENOENT;
}
dir_getFileStructure(&efsfs->filesystem, &entry, &loc);
st->st_dev = fs->dev_id;
st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
if ( entry.Attribute & ATTR_DIRECTORY )
{
st->st_mode &= ~DFS_S_IFREG;
st->st_mode |= DFS_S_IFDIR | DFS_S_IXUSR | DFS_S_IXGRP | DFS_S_IXOTH;
}
if ( entry.Attribute & ATTR_READ_ONLY )
st->st_mode &= ~(DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH);
st->st_size = entry.FileSize;
st->st_mtime = entry.WriteTime;
return 0;
}
/*
+------------------------------------------------------------------------------
| Function : dfile_raw_stat
+------------------------------------------------------------------------------
| Description : get the file or directory stat description
|
| Parameters : path, the file or directory path
| buf, the stat description will be saved in it
| Returns :
|
+------------------------------------------------------------------------------
*/
int dfile_raw_stat(const char *path, struct dfs_stat *buf)
{
struct dfs_filesystem* fs;
char* fullpath, real_path[DFS_PATH_MAX + 1];
#ifdef DFS_USING_WORKDIR
char full_path[DFS_PATH_MAX + 1];
#endif
int fspathlen;
fullpath = (char*)path;
if ( fullpath[0] != '/' )
{
#ifdef DFS_USING_WORKDIR
/* build full path */
fullpath = full_path;
dfs_lock();
build_fullpath(working_directory, path, fullpath);
dfs_unlock();
#else
#ifdef RT_USING_FINSH
rt_kprintf("not support working directory, bad filename\n");
#endif
return -1;
#endif
}
if ( (fs = dfs_filesystem_lookup(fullpath)) == RT_NULL )
{
dfs_log(DFS_DEBUG_ERROR, ("can't find mounted filesystem on this path:%s", fullpath));
return -DFS_STATUS_ENOENT;
}
fspathlen = strlen(fs->path);
rt_memset(real_path, 0, sizeof(real_path));
if (*(fullpath + fspathlen) != '/') strcpy(real_path, "/");
strcat(real_path, fullpath + fspathlen);
if (fs->ops->stat == RT_NULL)
{
dfs_log(DFS_DEBUG_ERROR, ("the filesystem didn't implement this function"));
return -DFS_STATUS_ENOSYS;
}
return fs->ops->stat(fs, real_path, buf);
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_lseek(struct dfs_fd* file, rt_off_t offset)
{
int result = 0;
DirList* efsdir;
efsl_fs* efsfs = (efsl_fs *)file->fs->data;
/* parameter check */
RT_ASSERT(efsfs != RT_NULL);
/* seek directory */
if(file->flags & DFS_O_DIRECTORY)
{
efsdir = (DirList*)file->data;
/* only support offset equels zero */
if(offset == 0)
{
result = ls_openDir(efsdir, &efsfs->filesystem, file->path);
if(result < 0)
{
dfs_log(DFS_DEBUG_INFO, ("open directory %s failed", file->path));
}
}
/* should implement in future version */
else
{
dfs_log(DFS_DEBUG_INFO, ("not implement"));
}
}
/* seek file */
else
{
File* efsfile = file->data;
/* parameter check */
if ( efsfile == RT_NULL) return -DFS_STATUS_EBADF;
result = file_setpos(efsfile, offset);
}
return result;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_close(struct dfs_fd* file)
{
int result = 0;
if (!file || !(file->flags & DFS_F_OPEN)) return -DFS_STATUS_EBADF;
if(!(file->flags & DFS_F_DIRECTORY))
result = file_fclose((File *)file->data);
else
{
dfs_log(DFS_DEBUG_INFO, ("close a directory, %s", file->path));
}
dfs_log(DFS_DEBUG_INFO, ("close a file, %s", file->path));
/* free directory or file */
rt_free(file->data);
file->data = RT_NULL;
return result;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_read(struct dfs_fd* file, void* buf, rt_size_t len)
{
File* efsfile = file->data;
int result = 0;
/* parameter check */
RT_ASSERT(efsfile != RT_NULL);
result = file_read(efsfile, len, buf);
file->pos = efsfile->FilePtr;
dfs_log(DFS_DEBUG_INFO, ("read file %s %d bytes", file->path, result));
return result;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_write(struct dfs_fd* file, const void* buf, rt_size_t len)
{
File* efsfile = file->data;
int result = 0;
/* parameter check */
RT_ASSERT(efsfile != RT_NULL);
result = file_write(efsfile, len, (euint8 *)buf);
file->pos = efsfile->FilePtr;
file->size = efsfile->FileSize;
dfs_log(DFS_DEBUG_INFO, ("write file %s %d bytes", file->path, result));
return result;
}
/*
+------------------------------------------------------------------------------
| Function : dfile_raw_open
+------------------------------------------------------------------------------
| Description :
|
| Parameters :
| Returns :
|
+------------------------------------------------------------------------------
*/
int dfile_raw_open(struct dfs_fd* fd, const char *path, int flags)
{
struct dfs_filesystem* fs;
char *fullpath;
#ifdef DFS_USING_WORKDIR
char full_path[DFS_PATH_MAX + 1];
#endif
int fspathlen, result;
/* parameter check */
if ( fd == RT_NULL ) return -DFS_STATUS_EINVAL;
/* make sure we have an absolute path */
fullpath = (char*)path;
if ( fullpath[0] != '/')
{
#ifdef DFS_USING_WORKDIR
/* build full path */
fullpath = &full_path[0];
dfs_lock();
build_fullpath(working_directory, path, fullpath);
dfs_unlock();
#else
#ifdef RT_USING_FINSH
rt_kprintf("bad filename");
#endif
return -1;
#endif
}
dfs_log(DFS_DEBUG_INFO, ("open file:%s", fullpath));
/* find filesystem */
fs = dfs_filesystem_lookup(fullpath);
if ( fs == RT_NULL ) return -DFS_STATUS_ENOENT;
dfs_log(DFS_DEBUG_INFO, ("open in filesystem:%s", fs->ops->name));
fd->fs = fs;
/* initilize the fd item */
fd->type = FT_REGULAR;
//fd->ref_count = 1;
fd->flags = flags;
fd->size = 0;
fd->pos = 0;
fspathlen = strlen(fs->path);
rt_memset(fd->path, 0, DFS_PATH_MAX + 1);
if (*(fullpath + fspathlen) != '/') strcpy(fd->path, "/");
strcat(fd->path, fullpath + fspathlen);
/* specific file system open routine */
if (fs->ops->open == RT_NULL)
{
/* clear fd */
rt_memset(fd->path, 0, DFS_PATH_MAX + 1);
fd->type = FT_REGULAR;
fd->ref_count = 0;
fd->fs = RT_NULL;
fd->flags = 0;
fd->size = 0;
fd->pos = 0;
fd->data = RT_NULL;
return -DFS_STATUS_ENOSYS;
}
if ((result = fs->ops->open(fd)) < 0)
{
/* clear fd */
fd->fs = RT_NULL;
fd->flags = 0;
fd->data = RT_NULL;
dfs_log(DFS_DEBUG_INFO, ("open failed"));
return result;
}
fd->flags |= DFS_F_OPEN;
if ( flags & DFS_O_DIRECTORY )
{
fd->type = FT_DIRECTORY;
fd->flags |= DFS_F_DIRECTORY;
}
dfs_log(DFS_DEBUG_INFO, ("open successful"));
return 0;
}
/**
* This function will set a hook function, which will be invoked when a memory
* block is allocated from heap memory.
*
* @param hook the hook function
*/
int efs_open(struct dfs_fd* file)
{
File* efsfile;
DirList* efsdir;
efsl_fs* efsfs = (efsl_fs*)(file->fs->data);
int result = 0;
/* parameter check */
if ( file == RT_NULL || file->fs == RT_NULL ||
file->fs->data == RT_NULL )
{
dfs_log(DFS_DEBUG_INFO, ("Invalid argument"));
return -DFS_STATUS_EINVAL;
}
/* open directory */
if(file->flags & DFS_O_DIRECTORY)
{
/* write directory is not supported */
if(file->flags & DFS_O_WRONLY || file->flags & DFS_O_RDWR)
{
dfs_log(DFS_DEBUG_INFO, ("write directory isn't supported"));
return -DFS_STATUS_EISDIR;
}
/* create directory */
if(file->flags & DFS_O_CREAT)
{
dfs_log(DFS_DEBUG_INFO, ("create directory"));
result = mk_dir(&efsfs->filesystem, file->path);
if(result < 0)
{
dfs_log(DFS_DEBUG_INFO, ("directory %s has existed", file->path));
return -DFS_STATUS_EEXIST;
}
}
efsdir = (DirList*)rt_malloc(sizeof(DirList));
if(efsdir == RT_NULL)
{
dfs_log(DFS_DEBUG_INFO, ("memory alloc failed"));
return -DFS_STATUS_ENOMEM;
}
result = ls_openDir(efsdir, &efsfs->filesystem, file->path);
if(result < 0)
{
dfs_log(DFS_DEBUG_INFO, ("open directory %s failed", file->path));
rt_free(efsdir);
}
else
{
file->data = efsdir;
}
}
/* open file */
else
{
efsfile = (File *)rt_malloc(sizeof(File));
if (efsfile == RT_NULL)
{
dfs_log(DFS_DEBUG_INFO, ("memory alloc failed"));
return -DFS_STATUS_ENOMEM;
}
result = file_fopen(efsfile, &efsfs->filesystem, file->path, file->flags);
if(result < 0)
{
dfs_log(DFS_DEBUG_INFO, ("open file %s failed", file->path));
rt_free(efsfile);
}
else
{
file->pos = efsfile->FilePtr;
file->size = efsfile->FileSize;
file->data = efsfile;
}
}
return result;
}
/**
* this function will open a file which specified by path with specified flags.
*
* @param fd the file descriptor pointer to return the corresponding result.
* @param path the spaciefied file path.
* @param flags the flags for open operator.
*
* @return 0 on successful, -1 on failed.
*/
int dfs_file_open(struct dfs_fd* fd, const char *path, int flags)
{
struct dfs_filesystem* fs;
char *fullpath;
int result;
/* parameter check */
if ( fd == RT_NULL ) return -DFS_STATUS_EINVAL;
/* make sure we have an absolute path */
fullpath = dfs_normalize_path(RT_NULL, path);
if (fullpath == RT_NULL)
{
return -1;
}
dfs_log(DFS_DEBUG_INFO, ("open file:%s", fullpath));
/* find filesystem */
fs = dfs_filesystem_lookup(fullpath);
if ( fs == RT_NULL )
{
rt_free(fullpath); /* release path */
return -DFS_STATUS_ENOENT;
}
dfs_log(DFS_DEBUG_INFO, ("open in filesystem:%s", fs->ops->name));
fd->fs = fs;
/* initilize the fd item */
fd->type = FT_REGULAR;
fd->flags = flags;
fd->size = 0;
fd->pos = 0;
if (dfs_subdir(fs->path, fullpath) == RT_NULL)
fd->path = rt_strdup("/");
else
fd->path = rt_strdup(dfs_subdir(fs->path, fullpath));
rt_free(fullpath);
dfs_log(DFS_DEBUG_INFO, ("actul file path: %s\n", fd->path));
/* specific file system open routine */
if (fs->ops->open == RT_NULL)
{
/* clear fd */
rt_free(fd->path);
rt_memset(fd, 0, sizeof(*fd));
return -DFS_STATUS_ENOSYS;
}
if ((result = fs->ops->open(fd)) < 0)
{
/* clear fd */
rt_free(fd->path);
rt_memset(fd, 0, sizeof(*fd));
dfs_log(DFS_DEBUG_INFO, ("open failed"));
return result;
}
fd->flags |= DFS_F_OPEN;
if ( flags & DFS_O_DIRECTORY )
{
fd->type = FT_DIRECTORY;
fd->flags |= DFS_F_DIRECTORY;
}
dfs_log(DFS_DEBUG_INFO, ("open successful"));
return 0;
}