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Use ftruncate() to map checkpoint images as sparse files.

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This commit is contained in:
C. Guy Yarvin 2013-11-11 11:13:47 -08:00
parent fd4e5f9e5f
commit 8bd25d8b32
1 changed files with 14 additions and 9 deletions
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23
f/wire.c
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@ -105,7 +105,7 @@ u2_wr_init(c3_m hip_m,
/* _wr_open(): open checkpoint file, or return null.
*/
static c3_i
_wr_open(c3_c* cpu_c, c3_c* fil_c, c3_c* suf_c)
_wr_open(c3_c* cpu_c, c3_c* fil_c, c3_c* suf_c, c3_w len_w)
{
c3_c ful_c[8193];
c3_i fid_i;
@ -121,6 +121,11 @@ _wr_open(c3_c* cpu_c, c3_c* fil_c, c3_c* suf_c)
if ( -1 == fid_i ) {
perror(ful_c); exit(1);
}
if ( len_w &&
(-1 == ftruncate(fid_i, (len_w * (1 << (LoomPageWords + 2))))) )
{
perror(ful_c); exit(1);
}
return fid_i;
}
@ -135,8 +140,8 @@ u2_wr_check_init(c3_c* cpu_c)
LoomSegmentA.bot_w = 2048;
LoomSegmentA.len_w = 30720;
LoomSegmentA.pgs_w = 0;
LoomSegmentA.ctl_i = _wr_open(cpu_c, "a", "ctl");
LoomSegmentA.dat_i = _wr_open(cpu_c, "a", "dat");
LoomSegmentA.ctl_i = _wr_open(cpu_c, "a", "ctl", 0);
LoomSegmentA.dat_i = _wr_open(cpu_c, "a", "dat", LoomSegmentA.len_w);
}
// Segment B, high memory.
@ -145,8 +150,8 @@ u2_wr_check_init(c3_c* cpu_c)
LoomSegmentB.bot_w = LoomHalfPages;
LoomSegmentB.len_w = 30719;
LoomSegmentB.pgs_w = 0;
LoomSegmentB.ctl_i = _wr_open(cpu_c, "b", "ctl");
LoomSegmentB.dat_i = _wr_open(cpu_c, "b", "dat");
LoomSegmentB.ctl_i = _wr_open(cpu_c, "b", "ctl", 0);
LoomSegmentB.dat_i = _wr_open(cpu_c, "b", "dat", LoomSegmentB.len_w);
}
// Segment C, the basket control block. Ugly.
@ -154,8 +159,8 @@ u2_wr_check_init(c3_c* cpu_c)
LoomSegmentC.bot_w = 63487;
LoomSegmentC.len_w = 1;
LoomSegmentC.pgs_w = 0;
LoomSegmentC.ctl_i = _wr_open(cpu_c, "c", "ctl");
LoomSegmentC.dat_i = _wr_open(cpu_c, "c", "dat");
LoomSegmentC.ctl_i = _wr_open(cpu_c, "c", "ctl", 0);
LoomSegmentC.dat_i = _wr_open(cpu_c, "c", "dat", LoomSegmentC.len_w);
}
// Segment D, the actual basket.
@ -163,8 +168,8 @@ u2_wr_check_init(c3_c* cpu_c)
LoomSegmentD.bot_w = 0;
LoomSegmentD.len_w = 2048;
LoomSegmentD.pgs_w = 0;
LoomSegmentD.ctl_i = _wr_open(cpu_c, "d", "ctl");
LoomSegmentD.dat_i = _wr_open(cpu_c, "d", "dat");
LoomSegmentD.ctl_i = _wr_open(cpu_c, "d", "ctl", 0);
LoomSegmentD.dat_i = _wr_open(cpu_c, "d", "dat", LoomSegmentD.len_w);
}
}