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/*
* Journal Based Flash Entrysystem.
*/
enum
{
// sector header
MAGSIZE = 4,
MAXHDR = MAGSIZE+3+3,
MAGIC0 = 'R',
MAGIC1 = 'O',
MAGIC2 = 'O',
FFSVERS = '0',
// transactions
FT_create = 'G',
FT_FCREATE0 = 'C',
FT_FCREATE1 = 'E',
FT_DCREATE0 = 'D',
FT_DCREATE1 = 'F',
FT_chmod = 'H',
FT_CHMOD0 = 'M',
FT_CHMOD1 = 'O',
FT_REMOVE = 'R',
FT_WRITE = 'W',
FT_AWRITE = 'A',
FT_trunc = 'I',
FT_TRUNC0 = 'T',
FT_TRUNC1 = 'V',
FT_SUMMARY = 'S',
FT_SUMBEG = 'B',
FT_SUMEND = 'Z',
MAXFSIZE = 1 << 21,
MAXNSIZE = 28,
Ncreate = 1+1+3*3+MAXNSIZE+1,
Nchmod = 1+1+2*3,
Nremove = 1+3,
Nwrite = 1+4*3,
Ntrunc = 1+1+4*3+MAXNSIZE+1,
Nsumbeg = 1+3,
Nmax = Ncreate,
Nsum = 2*(1+3),
Nfree = 3,
HBITS = 5,
HSIZE = 1 << HBITS,
HMASK = HSIZE - 1,
NOTIME = 0xFFFFFFFF,
WRSIZE = 4*1024,
};
typedef struct Extent Extent;
typedef struct Exts Exts;
typedef struct Entry Entry;
typedef struct Dirr Dirr;
typedef struct Jrec Jrec;
typedef struct Renum Renum;
struct Extent
{
int sect;
ulong addr;
ulong off;
ulong size;
Extent* next;
Extent* prev;
};
struct Exts
{
Extent* head;
Extent* tail;
};
struct Entry
{
int ref;
char* name;
ulong fnum;
ulong mode;
ulong mnum;
ulong mtime;
ulong size;
union
{
struct
{
Entry** htab;
Entry* files;
Dirr* readers;
};
struct
{
Exts gen[2];
};
};
Entry* parent;
Entry* hnext;
Entry* hprev;
Entry* fnext;
Entry* fprev;
};
struct Dirr
{
Entry* dir;
Entry* cur;
Dirr* next;
Dirr* prev;
ulong offset;
};
struct Jrec
{
int type;
ulong mode;
ulong fnum;
ulong mnum;
ulong tnum;
ulong mtime;
ulong parent;
ulong size;
ulong offset;
ulong seq;
char name[MAXNSIZE+2];
};
struct Renum
{
int old;
int new;
};
extern void initdata(char*, int);
extern void clearsect(int);
extern void readdata(int, void*, ulong, ulong);
extern int writedata(int, int, void*, ulong, ulong);
extern int getc3(uchar*, ulong*);
extern int putc3(uchar*, ulong);
extern ulong get4(uchar*);
extern void put4(uchar*, ulong);
extern int convM2J(Jrec*, uchar*);
extern int convJ2M(Jrec*, uchar*);
extern void loadfs(int);
extern char* need(int bytes);
extern void put(Jrec*, int);
extern void putw(Jrec*, int, Extent *x, void*);
extern int Jconv(Fmt*);
extern ulong now(void);
extern void serve(char*);
#pragma varargck type "J" Jrec*
extern void einit(void);
extern void edump(void);
extern Entry* elookup(ulong);
extern Extent* esum(Entry*, int, ulong, int*);
extern void edestroy(Entry*);
extern Entry* ecreate(Entry*, char*, ulong, ulong, ulong, char**);
extern char* eremove(Entry*);
extern Entry* ewalk(Entry*, char*, char**);
extern void etrunc(Entry*, ulong, ulong);
extern ulong echmod(Entry*, ulong, ulong);
extern ulong eread(Entry*, int, void*, ulong, ulong);
extern void ewrite(Entry*, Extent *, int, ulong);
extern Qid eqid(Entry*);
extern void estat(Entry*, Dir*, int);
extern Dirr* ediropen(Entry*);
extern int edirread(Dirr*, char*, long);
extern void edirclose(Dirr*);
extern void erenum(Renum*);
extern char Edirnotempty[];
extern char Eexists[];
extern char Eisdir[];
extern char Enonexist[];
extern char Enotdir[];
extern char Eperm[];
extern char Erofs[];
extern ulong sectsize;
extern ulong nsects;
extern uchar* sectbuff;
extern Entry *root;
extern int readonly;
extern ulong delta;
extern int eparity;
extern uchar magic[];
extern ulong used;
extern ulong limit;
extern ulong maxwrite;
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