fssrv.h

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#ifndef __FSSRV_H__
#define __FSSRV_H__
 
#include <stdint.h>
 
#define FSSRV_ENDPOINT   "fs"
#define FSSRV_NAME_MAX   31
#define FSSRV_MAX_DATA   4096
 
#define FSSRV_OP_OPEN    1        /* flags: FSSRV_F_*, answers size/uid        */
#define FSSRV_OP_READ    2        /* offset, len -> data                       */
#define FSSRV_OP_WRITE   3        /* offset, data (len bytes follow)           */
#define FSSRV_OP_READDIR 4        /* offset = entry index -> one FsDirEnt or FSSRV_E_NOENT at the end */
#define FSSRV_OP_REMOVE  5        /* owner or uid 0 only                       */
 
#define FSSRV_F_CREATE   1
#define FSSRV_F_WRITE    2
 
#define FSSRV_OK          0
#define FSSRV_E_NOENT    -1
#define FSSRV_E_PERM     -2
#define FSSRV_E_INVAL    -3
#define FSSRV_E_NOSPC    -4
 
typedef struct {
    uint32_t op;
    uint32_t flags;
    uint32_t offset;
    uint32_t len;                      /* READ: bytes wanted; WRITE: bytes following */
    char name[FSSRV_NAME_MAX + 1];     /* file name inside the file system, no '/' */
} FsReq;                               /* WRITE data follows this header */
 
/* one directory entry, returned as the data of a READDIR answer */
typedef struct {
    char name[FSSRV_NAME_MAX + 1];
    uint32_t size;
    uint32_t uid;
} FsDirEnt;
 
typedef struct {
    int32_t status;
    uint32_t size;                     /* file size after the operation */
    uint32_t uid;                      /* owner */
    uint32_t len;                      /* READ: data bytes following */
} FsResp;                              /* READ data follows this header */
 
#endif