92ae5c81ae
- optionally vectorize I/O requests to work around hardware bugs - extend default buffer size to cover MFS's default maximum request size - use mmap directly, rather than alloc_contig - add 'nil' checksum type for comparison with layout - minor style corrections
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/* Filter driver - utility functions */
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#include "inc.h"
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#include <sys/mman.h>
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#include <signal.h>
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static clock_t next_alarm;
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/*===========================================================================*
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* flt_malloc *
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*===========================================================================*/
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char *flt_malloc(size_t size, char *sbuf, size_t ssize)
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{
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/* Allocate a buffer for 'size' bytes. If 'size' is equal to or less
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* than 'ssize', return the static buffer 'sbuf', otherwise, use
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* malloc() to allocate memory dynamically.
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*/
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char *p;
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if (size <= ssize)
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return sbuf;
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p = mmap(NULL, size, PROT_READ | PROT_WRITE,
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MAP_PREALLOC | MAP_CONTIG | MAP_ANON, -1, 0);
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if (p == MAP_FAILED)
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panic(__FILE__, "out of memory", size);
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return p;
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}
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/*===========================================================================*
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* flt_free *
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*===========================================================================*/
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void flt_free(char *buf, size_t size, char *sbuf)
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{
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/* Free a buffer previously allocated with flt_malloc().
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*/
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if(buf != sbuf)
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munmap(buf, size);
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}
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/*===========================================================================*
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* print64 *
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*===========================================================================*/
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char *print64(u64_t p)
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{
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#define NB 10
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static int n = 0;
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static char buf[NB][100];
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u32_t lo = ex64lo(p), hi = ex64hi(p);
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n = (n+1) % NB;
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if(!hi) sprintf(buf[n], "%lx", lo);
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else sprintf(buf[n], "%lx%08lx", hi, lo);
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return buf[n];
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}
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/*===========================================================================*
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* flt_alarm *
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*===========================================================================*/
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clock_t flt_alarm(clock_t dt)
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{
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int r;
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if(dt < 0)
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return next_alarm;
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r = sys_setalarm(dt, 0);
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if(r != OK)
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panic(__FILE__, "sys_setalarm failed", r);
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if(dt == 0) {
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if(!next_alarm)
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panic(__FILE__, "clearing unset alarm", r);
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next_alarm = 0;
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} else {
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if(next_alarm)
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panic(__FILE__, "overwriting alarm", r);
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if ((r = getuptime(&next_alarm)) != OK)
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panic(__FILE__, "getuptime failed", r);
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next_alarm += dt;
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}
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return next_alarm;
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}
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/*===========================================================================*
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* got_alarm *
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*===========================================================================*/
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static void got_alarm(int sig)
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{
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/* Do nothing. */
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}
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/*===========================================================================*
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* flt_sleep *
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*===========================================================================*/
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void flt_sleep(int secs)
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{
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/* Sleep for the given number of seconds. Don't use sleep(), as that
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* will end up calling select() to VFS. This implementation could be
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* improved.
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*/
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signal(SIGALRM, got_alarm);
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alarm(secs);
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pause();
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}
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