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enum {
/* affects on-disk structure */
BLOCK = 4096,
RBLOCK = BLOCK - 1,
SUPERMAGIC = 0x6E0DE51C,
SUPERBLK = 0,
NAMELEN = 256,
NDIRECT = 15,
NINDIRECT = 4,
ROOTQID = 1,
DUMPROOTQID = 2,
/* affects just run-time behaviour */
SYNCINTERVAL = 10000,
FREELISTLEN = 256,
BUFHASHBITS = 8,
BUFHASH = (1<<BUFHASHBITS)-1,
NWORKERS = 5,
EXCLDUR = 300,
NOUID = (short)0x8000,
USERLEN = 64,
};
typedef struct Fs Fs;
typedef struct Buf Buf;
typedef struct Dev Dev;
typedef struct BufReq BufReq;
typedef struct ThrData ThrData;
typedef struct Superblock Superblock;
typedef struct Dentry Dentry;
typedef struct Chan Chan;
typedef struct FLoc FLoc;
typedef struct Loc Loc;
typedef struct User User;
#pragma incomplete struct User
#pragma varargck type "T" int
#pragma varargck type "T" uint
enum {
TRAW,
TSUPERBLOCK,
TDENTRY,
TINDIR,
TREF,
TDONTCARE = -1,
};
struct Superblock {
ulong magic;
uvlong size;
uvlong fstart;
uvlong fend;
uvlong root;
uvlong qidpath;
};
enum {
DALLOC = 1<<15,
DGONE = 1<<14,
};
struct Dentry {
char name[NAMELEN];
short uid;
short muid;
short gid;
ushort mode;
Qid;
uvlong size; /* bytes for files and blocks for dirs */
uvlong db[NDIRECT];
uvlong ib[NINDIRECT];
vlong atime;
vlong mtime;
};
enum {
DENTRYSIZ = NAMELEN + 4 * sizeof(ushort) + 13 + (3 + NDIRECT + NINDIRECT) * sizeof(uvlong),
DEPERBLK = RBLOCK / DENTRYSIZ,
/* Given any opportunity to make a breaking change to hjfs,
* make this 12 an 8. Indirect offsets to blocks used to
* hold an incrementing 4 byte generation number. That
* design has changed.
*/
OFFPERBLK = RBLOCK / 12,
REFSIZ = 3,
REFPERBLK = RBLOCK / REFSIZ,
REFSENTINEL = (1 << 8*REFSIZ) - 1,
};
struct BufReq {
Dev *d;
uvlong off;
int nodata;
Channel *resp;
BufReq *next;
};
enum {
BWRITE = 1, /* used only for the worker */
BWRIM = 2, /* write immediately after putbuf */
BDELWRI = 4, /* write delayed */
};
struct Buf {
uchar op, type;
union {
uchar data[RBLOCK];
Superblock sb;
Dentry de[DEPERBLK];
uvlong offs[OFFPERBLK];
ulong refs[REFPERBLK];
};
/* do not use anything below (for the bufproc only) */
uchar busy;
char *error;
Buf *dnext, *dprev;
Buf *fnext, *fprev;
BufReq;
BufReq *last;
ulong callerpc; /* debugging */
Buf *wnext, *wprev;
};
struct ThrData {
Channel *resp;
};
struct Dev {
char *name;
int size;
Buf buf[BUFHASH+1]; /* doubly-linked list */
Dev *next;
int fd;
Rendez workr;
QLock workl;
Buf work;
};
extern Dev *devs;
struct FLoc {
uvlong blk;
int deind;
Qid;
};
enum {
LGONE = 1,
LDUMPED = 2,
};
struct Loc {
FLoc;
int ref, flags;
Loc *next, *child;
Loc *cnext, *cprev;
Loc *gnext, *gprev;
QLock ex;
Chan *exlock;
ulong lwrite;
};
enum {
FSNOAUTH = 1,
FSNOPERM = 2,
FSCHOWN = 4,
};
struct Fs {
RWLock;
Dev *d;
int flags;
uvlong root, fstart;
Channel *freelist;
Loc *rootloc, *dumprootloc;
QLock loctree;
User *udata;
int nudata;
RWLock udatal;
};
enum {
CHREAD = 1,
CHWRITE = 2,
CHRCLOSE = 4,
CHFDUMP = 1,
CHFNOLOCK = 2,
CHFRO = 4,
CHFNOPERM = 8,
CHWBUSY = 1,
CHWCLUNK = 2,
};
struct Chan {
Fs *fs;
Loc *loc;
uchar open;
uchar flags;
ushort uid;
/* dir walk */
uvlong dwloff;
uvlong dwblk;
int dwind;
/* workers */
void *freq, *lreq;
Chan *qnext, *qprev;
int wflags;
};
extern QLock chanqu;
extern Rendez chanre;
extern Chan readych;
extern char Eio[];
extern char Enotadir[];
extern char Enoent[];
extern char Einval[];
extern char Eperm[];
extern char Eexists[];
extern char Elocked[];
enum { /* getblk modes */
GBREAD = 0,
GBWRITE = 1,
GBCREATE = 2,
GBOVERWR = 3,
};
#define HOWMANY(a) (((a)+(RBLOCK-1))/RBLOCK)
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