ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/cmd/hjfs/dat.h/
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)