vfs.h

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#ifndef __SYS_VFS_H__
#define __SYS_VFS_H__
 
#include <sys/kmem.h>
#include <sys/stat.h>
 
typedef struct VFSOp VFSOp;
typedef struct VNode VNode;
 
typedef struct VFS {
    VFSOp               *op;
    Disk                *disk;
    Spinlock            lock;
    uint64_t            refCount;
    // FS Fields
    void                *fsptr;
    uint64_t            fsval;
    uint64_t            blksize;
    VNode               *root;
    void                *bitmap[16];
} VFS;
 
typedef struct VNode {
    VFSOp               *op;
    Disk                *disk;
    Spinlock            lock;
    uint64_t            refCount;
    // FS Fields
    void                *fsptr;
    uint64_t            fsval;
    VFS                 *vfs;
} VNode;
 
DECLARE_SLAB(VFS);
DECLARE_SLAB(VNode);
 
typedef struct VFSOp {
    // VFS Operations
    int (*unmount)(VFS *fs);
    int (*getroot)(VFS *fs, VNode **dn);
    // VNode Operations
    int (*lookup)(VNode *dn, VNode **fn, const char *name);
    int (*open)(VNode *fn);
    int (*close)(VNode *fn);
    int (*stat)(VNode *fn, struct stat *sb);
    int (*read)(VNode *fn, void *buf, uint64_t off, uint64_t len);
    int (*write)(VNode *fn, void *buf, uint64_t off, uint64_t len);
    int (*readdir)(VNode *fn, void *buf, uint64_t len, uint64_t *off);
} VFSOp;
 
int VFS_MountRoot(Disk *root);
VNode *VFS_Lookup(const char *path);
// XXX: Release/Retain
int VFS_Stat(const char *path, struct stat *sb);
int VFS_Open(VNode *fn);
int VFS_Close(VNode *fn);
int VFS_Read(VNode *fn, void *buf, uint64_t off, uint64_t len);
int VFS_Write(VNode *fn, void *buf, uint64_t off, uint64_t len);
int VFS_ReadDir(VNode *fn, void *buf, uint64_t len, uint64_t *off);
 
#endif /* __SYS_VFS_H__ */