ref: b5d191e8cfa4fac05a02ea309df2541a2652ff23
dir: /dat.h/
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef signed long long s64;
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
enum
{
KiB = 1024ULL, /* Kibibytes */
MiB = KiB*KiB, /* Mibibytes */
GiB = KiB*MiB, /* Gibibytes */
TiB = KiB*GiB, /* Tibibytes */
Nusers = 32, /* max. number of users */
None = 0, /* user ID for "none" */
Noworld = 9999, /* conventional id for "noworld" group */
Userlen = 32,
Nsec = 1000ULL*1000*1000,
Usec = 1000ULL*1000,
Msec = 1000ULL,
MAXRPC = 8192ULL,
Nbkp = 2,
/* Qpnone is the Tag.path of free blocks/extents(Tfree),
and zero'ed out dentry blocks */
Qpnone = 0,
Qpmagic = 1, /* magic block Tag.qpath */
Qpconfig = 2, /* /adm/config block Tag.qpath */
Qpsuper = 3, /* /adm/super block Tag.qpath */
Qpadm = 5, /* /adm */
Qpusers = 6, /* /adm/users */
Qpbkp = 7, /* /adm/bkp block Tag.qpath */
Qpconfig0 = 8, /* /adm/bkp/config.0 block Tag.qpath */
Qpsuper0 = 9, /* /adm/bkp/super.0 block Tag.qpath */
Qproot0 = 10, /* /adm/bkp/root.0 block Tag.qpath */
Qpconfig1 = 11, /* /adm/bkp/config.1 block Tag.qpath */
Qpsuper1 = 12, /* /adm/bkp/super.1 block Tag.qpath */
Qproot1 = 13, /* /adm/bkp/root.1 block Tag.qpath */
Qpctl = 14, /* /adm/ctl */
Qpfrees = 15, /* /adm/frees block Tag.qpath */
Nqidgen = 64,
Qproot = Nqidgen-1, /* /, so fscreate() can disallow any create's below */
/* check qpath for overflows - TODO, should be 2^64 */
Maxqpath = 72057594037927936ULL, /* 2^56 */
};
/*
* fundamental constants and types of the implementation
* changing any of these changes the layout on disk
* The very first block (index = 0) has the magic written at offset 256.
*/
enum {
Rawblocksize= 512ULL, /* real block size */
Ndblock = 32, /* number of direct blocks in a Dentry */
Niblock = 6, /* maximum depth of indirect blocks */
/* global block numbers. The bkp contents locations are calculated by ream() */
Bmagicb = 0, /* block number of first block. Bmagic conflicts with bio.h */
Bconfig = 1, /* block number of config contents */
Bsuper = 2, /* block number of super contents */
Broot = 3, /* block number of root directory */
Badm = 4, /* block number of /adm directory */
Bdconfig = 5, /* block number of /adm/config dentry */
Bdsuper = 6, /* block number of /adm/super dentry */
Bdusers = 7, /* block number of /adm/users file */
Busers = 8, /* block number of /adm/users file contents */
Bbkp = 9, /* block number of /adm/bkp directory */
Bdconfig0 = 10, /* block number of /adm/bkp/config.0 dentry */
Bdsuper0 = 11, /* block number of /adm/bkp/super.0 dentry */
Bdroot0 = 12, /* block number of /adm/bkp/root.0 dentry */
Bdconfig1 = 13, /* block number of /adm/bkp/config.1 dentry */
Bdsuper1 = 14, /* block number of /adm/bkp/super.1 dentry */
Bdroot1 = 15, /* block number of /adm/bkp/root.1 dentry */
Bdctl = 16, /* block number of /adm/ctl dentry, empty contents, virtual file */
Bdfrees = 17, /* block number of /adm/frees dentry, text file of free extents */
Nbused, /* blocks used up by default */
Nminblocks = Nbused+(Nbkp*3), /* number of blocks used by the above and the backup blocks */
Nthdirty = 9, /* dirty byte is the 9th byte in the Tag */
};
typedef struct Config Config;
typedef struct Content Content;
typedef struct Dentry1 Dentry1;
typedef struct Dentry Dentry;
typedef struct Fblock Fblock;
typedef struct Qid9p1 Qid9p1;
typedef union Rabuf Rabuf;
typedef struct Super1 Super1;
typedef struct Superb Superb;
typedef struct Tag Tag;
typedef struct User User;
typedef struct Aux Aux;
typedef struct Log Log;
typedef struct P9call P9call;
typedef struct Tlock Tlock;
typedef struct Uid Uid;
/*
* DONT TOUCH -- data structures stored on disk
*/
#pragma pack on
/* DONT TOUCH, this is the disk structure */
struct Tag
{
u8 type; /* Tmagic, Tdentry, Tdata, Tindn */
u64 path; /* Qid.path, unique identifier */
};
/* DONT TOUCH, this is the disk structure */
struct Super1
{
u64 start; /* starting block */
u64 tfree; /* total number of free blocks - obsolete? */
u64 qidgen; /* generator for unique ids. starts from 1024. */
u64 frees; /* list of free extents was written here at halt */
/* make fsok a time stamp with the highest bit being the fsok flag */
u64 fsok; /* fsck status, using 64 bits to keep it all aligned */
};
/* DONT TOUCH, this is the disk structure */
struct Qid9p1
{
u32 version;
u64 path; /* unique identifier */
};
/* DONT TOUCH, this is the disk structure */
/*
* 1 dentry per block
* no access time
*/
struct Dentry1
{
Qid9p1 qid;
u64 size; /* 0 for directories. For files, size in bytes of the content */
u64 pdblkno; /* block number of the parent directory entry. Will be 0 for root. */
u64 pqpath; /* parent qid.path */
u64 mtime; /* modified time in nano seconds from epoch */
u32 mode; /* same bits as defined in /sys/include/libc.h:/Dir\.mode/ */
s16 uid;
s16 gid;
s16 muid;
u64 dblocks[Ndblock]; /* direct blocks. */
/* List of Tdata block numbers for files and
Tdentry block numbers for directories */
/* Tag.type = Tdentry for directories and Tdata for files */
u64 iblocks[Niblock]; /* indirect blocks */
};
#pragma pack off
/*
* derived constants
* Ndentriesperblock number of Dentry's in a block
* Nindperblock number of block pointers in a block
*/
enum {
Blocksize = Rawblocksize - sizeof(Tag),
Namelen = (Blocksize-sizeof(Dentry1)), /* maximum size of the name of a file or directory */
Iounit = MAXRPC, /* in bytes */
Ntogether = (Iounit/Blocksize)+1, /* max probable size for jumbo writes */
Ndentryperblock = 1, /* Blocksize/sizeof(Dentry), */
Nindperblock = Blocksize/sizeof(u64),/* number of pointers per block */
};
#pragma pack on
/* DONT TOUCH, this is the disk structure */
struct Dentry
{
struct Dentry1;
char name[Namelen];
};
struct Content /* used to unmarshall the disk contents */
{
union{
u8 buf[Blocksize];
u64 bufa[Nindperblock];
Dentry d;
};
Tag;
};
#pragma pack off
#pragma pack on
/* DONT TOUCH, this is the disk structure */
struct Superb
{
Super1;
};
#pragma pack off
/*
* array of qids that are locked
*/
struct Tlock
{
u64 time;
u64 qpath;
u64 dblkno;
Tlock *prev, *next;
};
struct Aux
{
u64 dblkno; /* dentry absolute block number */
u16 uid;
u8 tlocked; /* for exclusive use files, flag to indicate lock */
u64 dri; /* directory index while reading a directory */
/* u64 lastreadahead; TODO */
};
struct User
{
s16 id; /* user id */
s16 lid; /* id of the leader of group */
s16 members[Nusers]; /* group table, member id's */
int nmembers; /* number of group entries */
char name[Userlen]; /* user name */
User *next;
};
struct Bkp
{
u64 srcbno; /* source of the backup */
u64 dest[Nbkp]; /* destinations written to */
};
struct Config
{
u64 size; /* size from dirfstat */
u64 nblocks; /* size in blocks */
struct Bkp config;
struct Bkp super;
struct Bkp root;
char service[Namelen];
};
enum
{
Nworks = 1024, /* make this a parameter? */
Nprocs = 32, /* make this a parameter? */
Nlru = 32,
};
/*
* error codes generated from the file server
*/
enum
{
Eaccess = 1,
Ealloc,
Eauth,
Eauthmsg,
Ebadname,
Ebadspc,
Ebadu,
Ebroken,
Echar,
Econvert,
Ecount,
Edir1,
Edir2,
Edirty,
Edot,
Eempty,
Eentry,
Eexist,
Efid,
Efidinuse,
Efull,
Einval,
Elocked,
Emode,
Ename,
Enomem,
Enotd,
Enotdir,
Enotg,
Enotl,
Enotm,
Enotu,
Enotw,
Eoffset,
Eopen,
Eperm,
Ephase,
Eqid,
Eqidmode,
Eronly,
Ersc,
Eshutdown,
Esystem,
Etoolong,
Etoou64,
Ewalk,
MAXERR
};
/*
* tags on block
*/
/* DONT TOUCH, this is in disk structures */
/* also, the order from Tdata to Tmaxind is exploited in indirck() & isdirty() */
enum
{
Tblank = 0,
Tfree = 0, /* free block */
Tnone = 0,
Tmagic, /* the first (zero'th) block holds the magic */
Tdentry, /* directory entry */
/* Tdata & indirect blocks are last, to allow for greater depth */
Tdata, /* actual file contents */
Tind0, /* contains a list of Tdata block numbers for files
and Tdentry block numbers for directories.*/
Tind1, /* contains a list of Tind0 block numbers */
Tind2, /* contains a list of Tind1 block numbers */
Tind3, /* contains a list of Tind2 block numbers */
Tind4, /* contains a list of Tind3 block numbers */
Tind5, /* contains a list of Tind4 block numbers, maximum file size 26 TiB */
Maxtind, /* should be Tind0+Niblock */
/* gap for more indirect block depth in future */
MAXTAG,
Tmaxind = Maxtind - 1,
};
/*
* flags to getbuf
*/
enum
{
Breadonly = 1,/* read the block, cannot write to it */
Bwritable = 0,
Bfreshalloc = 1,/* newly allocated block, no contents on the disk */
Bused = 0,/* has contents on the disk */
};
#define SECOND(n) (n)
#define MINUTE(n) (n*SECOND(60))
#define HOUR(n) (n*MINUTE(60))
#define DAY(n) (n*HOUR(24))
#define TLOCK MINUTE(5)
extern char* errstring[MAXERR];
extern char service[Namelen];
extern char *tagnames[];
extern char *devfile; /* device file path */
extern int devfd ; /* device fd */
extern int writeallow;
extern int wstatallow;
extern int allownone;
extern u8 readonly;
extern u8 shuttingdown;
extern u8 noauth;
/* used by panic() */
extern char *procname;
extern Config config;