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subsys: fs: Add the support for multiple instances of fs

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Add support for multiple instances of a file system by
making use of mount point as the disk volume name which
is used by the file system library while formatting or
mounting a disk.

Also moved out file system specific data structures from
public fs.h header and handled them in corresponding
file system interface files by introducing open files and
open directories concept which is already being used in
NFFS interface module. Now it is extended to FatFs as well.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
This commit is contained in:
Ramakrishna Pallala 2018-04-16 22:14:48 +05:30 • committed by Anas Nashif
commit dd5449a77b
5 changed files with 128 additions and 103 deletions
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32
include/fs/fs_interface.h
View file

@ -7,14 +7,6 @@
#ifndef _FS_INTERFACE_H_
#define _FS_INTERFACE_H_
#ifdef CONFIG_FAT_FILESYSTEM_ELM
#include <ff.h>
#endif
#ifdef CONFIG_FILE_SYSTEM_NFFS
#include <nffs/nffs.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
@ -30,38 +22,22 @@ struct fs_mount_t;
/**
* @brief File object representing an open file
*
* @param fatfs_fp FATFS file object structure
* @param nffs_fp NFFS file object structure
* @param Pointer to FATFS file object structure
* @param mp Pointer to mount point structure
*/
struct fs_file_t {
union {
#ifdef CONFIG_FAT_FILESYSTEM_ELM
FIL fatfs_fp;
#endif
#ifdef CONFIG_FILE_SYSTEM_NFFS
struct nffs_file *nffs_fp;
#endif
};
void *filep;
const struct fs_mount_t *mp;
};
/**
* @brief Directory object representing an open directory
*
* @param fatfs_dp FATFS directory object structure
* @param nffs_dp NFFS directory object structure
* @param dirp Pointer to directory object structure
* @param mp Pointer to mount point structure
*/
struct fs_dir_t {
union {
#ifdef CONFIG_FAT_FILESYSTEM_ELM
DIR fatfs_dp;
#endif
#ifdef CONFIG_FILE_SYSTEM_NFFS
struct nffs_dir *nffs_dp;
#endif
};
void *dirp;
const struct fs_mount_t *mp;
};