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Some tweaks to get this to cope with ELF where the address space starts

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higher up in memory (0x0800000 upwards) rather than near zero (0x1000
for our qmagic a.out format).  The method that mount_mfs uses to allocate
the memory within data size rlimits for the ram disk is entirely too much
of a kludge for my liking.  I mean, if it's run as root, surely it makes
sense to just raise the resource limits to infinity or something, and if
it's a non-root user mount (do these work? with mfs?) it could just fail
if it's outside limits.
This commit is contained in:
Peter Wemm 1997-09-13 11:41:50 +00:00
parent edb0d8e9fc
commit 079709dc3a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=29321
1 changed files with 18 additions and 8 deletions
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26
sbin/newfs/mkfs.c
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@ -208,9 +208,9 @@ mkfs(pp, fsys, fi, fo)
#ifndef STANDALONE
get_memleft();
#endif
if (fssize * sectorsize > (memleft - 16384))
fssize = (memleft - 16384) / sectorsize;
if ((membase = malloc(fssize * sectorsize)) == 0) {
if (fssize * sectorsize > (memleft - 131072))
fssize = (memleft - 131072) / sectorsize;
if ((membase = malloc(fssize * sectorsize)) == NULL) {
perror("malloc");
exit(13);
}
@ -1210,18 +1210,28 @@ raise_data_limit()
perror("setrlimit");
}
#ifdef __ELF__
extern char *_etext;
#define etext _etext
#else
extern char *etext;
#endif
get_memleft()
{
char *base;
static u_long pgsz, i;
static u_long pgsz;
struct rlimit rlp;
u_long freestart;
u_long dstart;
u_long memused;
base = sbrk(0);
pgsz = getpagesize() - 1;
i = ((u_long)(base + pgsz) &~ pgsz);
dstart = ((u_long)&etext) &~ pgsz;
freestart = ((u_long)(sbrk(0) + pgsz) &~ pgsz);
if (getrlimit(RLIMIT_DATA, &rlp) < 0)
perror("getrlimit");
memleft = rlp.rlim_cur - (u_long)base - i;
memused = freestart - dstart;
memleft = rlp.rlim_cur - memused;
}
#endif /* STANDALONE */