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- typedef struct Bbuf Bbuf;
- typedef struct Bcache Bcache;
- enum
- {
- Nbcache= 32, /* number of blocks kept in pool */
- };
- /*
- * block cache descriptor
- */
- struct Bbuf
- {
- Lru; /* must be first in struct */
- ulong bno;
- int inuse;
- Bbuf *next; /* next in dirty list */
- int dirty;
- char *data;
- };
- /*
- * the buffer cache
- */
- struct Bcache
- {
- Lru;
- int bsize; /* block size in bytes */
- int f; /* fd to disk */
- Bbuf *dfirst; /* dirty list */
- Bbuf *dlast;
- Bbuf bb[Nbcache];
- };
- int bcinit(Bcache*, int, int);
- Bbuf* bcalloc(Bcache*, ulong);
- Bbuf* bcread(Bcache*, ulong);
- void bcmark(Bcache*, Bbuf*);
- int bcwrite(Bcache*, Bbuf*);
- int bcsync(Bcache*);
- int bread(Bcache*, ulong, void*);
- int bwrite(Bcache*, ulong, void*);
- int bref(Bcache*, Bbuf*);
- void error(char*, ...);
- void warning(char*);
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