79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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typedef struct MLock MLock;
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typedef struct Iosect Iosect;
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typedef struct Iotrack Iotrack;
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typedef struct Track Track;
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typedef struct Xfs Xfs;
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struct MLock
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{
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char key;
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};
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struct Iosect
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{
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Iosect *next;
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short flags;
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MLock lock;
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Iotrack *t;
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unsigned char * iobuf;
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};
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struct Iotrack
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{
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short flags;
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Xfs * xf;
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int32_t addr;
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Iotrack *next; /* in lru list */
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Iotrack *prev;
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Iotrack *hnext; /* in hash list */
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Iotrack *hprev;
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MLock lock;
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int ref;
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Track *tp;
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};
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enum{
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Sectorsize = 512,
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Sect2trk = 9,
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Trksize = Sectorsize*Sect2trk
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};
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struct Track
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{
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Iosect *p[Sect2trk];
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unsigned char buf[Sect2trk][Sectorsize];
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};
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#define BMOD (1<<0)
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#define BIMM (1<<1)
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#define BSTALE (1<<2)
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Iosect* getiosect(Xfs*, int32_t, int);
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Iosect* getosect(Xfs*, int32_t);
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Iosect* getsect(Xfs*, int32_t);
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Iosect* newsect(void);
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Iotrack* getiotrack(Xfs*, int32_t);
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int canmlock(MLock*);
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int devcheck(Xfs*);
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int devread(Xfs*, int32_t, void*, int32_t);
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int devwrite(Xfs*, int32_t, void*, int32_t);
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int tread(Iotrack*);
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int twrite(Iotrack*);
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void freesect(Iosect*);
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void iotrack_init(void);
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void mlock(MLock*);
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void purgebuf(Xfs*);
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void purgetrack(Iotrack*);
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void putsect(Iosect*);
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void sync(void);
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void unmlock(MLock*);
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