added hjfs

1 files changed, 228 insertions, 0 deletions

diff --git a/sys/src/cmd/hjfs/dat.h b/sys/src/cmd/hjfs/dat.h
new file mode 100644
index 000000000..6201eb50a
--- /dev/null
+++ b/sys/src/cmd/hjfs/dat.h
@@ -0,0 +1,228 @@
+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,
+};
+
+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,
+	OFFPERBLK = RBLOCK / 12,
+	REFPERBLK = RBLOCK / 3,
+};
+
+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,
+};
+
+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,
+};
+
+
+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;
+};
+
+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, b) (((a)+((b)-1))/(b))
+#define ROUNDUP(a, b) (HOWMANY(a,b)*(b))