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freebsd: libshare/nfs: write directly in translate_opts()

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This renders it thread-safe

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13165
This commit is contained in:
наб 2022-02-28 12:55:07 +01:00 committed by Brian Behlendorf
parent 5f0c1c4ebd
commit ee668b8331
1 changed files with 9 additions and 10 deletions
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19
lib/libshare/os/freebsd/nfs.c
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@ -55,7 +55,7 @@ __FBSDID("$FreeBSD$");
static sa_fstype_t *nfs_fstype;
/*
* This function translate options to a format acceptable by exports(5), eg.
* This function translates options to a format acceptable by exports(5), eg.
*
* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 \
* zfs.freebsd.org 69.147.83.54
@ -72,17 +72,14 @@ static sa_fstype_t *nfs_fstype;
*
* ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs,
* index, quiet
*
* NOTE: This function returns a static buffer and thus is not thread-safe.
*/
static char *
translate_opts(const char *shareopts)
static int
translate_opts(const char *shareopts, FILE *out)
{
static const char *const known_opts[] = { "ro", "maproot", "mapall",
"mask", "network", "sec", "alldirs", "public", "webnfs", "index",
"quiet" };
static char newopts[OPTSSIZE];
char oldopts[OPTSSIZE];
char oldopts[OPTSSIZE], newopts[OPTSSIZE];
char *o, *s = NULL;
unsigned int i;
size_t len;
@ -104,7 +101,7 @@ translate_opts(const char *shareopts)
strlcat(newopts, o, sizeof (newopts));
strlcat(newopts, " ", sizeof (newopts));
}
return (newopts);
return (fputs(newopts, out));
}
static int
@ -114,8 +111,10 @@ nfs_enable_share_impl(sa_share_impl_t impl_share, FILE *tmpfile)
if (strcmp(shareopts, "on") == 0)
shareopts = "";
if (fprintf(tmpfile, "%s\t%s\n", impl_share->sa_mountpoint,
translate_opts(shareopts)) < 0) {
if (fputs(impl_share->sa_mountpoint, tmpfile) == EOF ||
fputc('\t', tmpfile) == EOF ||
translate_opts(shareopts, tmpfile) == EOF ||
fputc('\n', tmpfile) == EOF) {
fprintf(stderr, "failed to write to temporary file\n");
return (SA_SYSTEM_ERR);
}