Author: dgilmore
Date: 2010-10-12 19:07:00 -0400 (Tue, 12 Oct 2010)
New Revision: 3372
Modified:
trunk/osprey/libhugetlbfs/hugeutils.c
Log:
Fix libhugetlbfs problem -- bug 667.
Approved by Sun.
Modified: trunk/osprey/libhugetlbfs/hugeutils.c
===================================================================
--- trunk/osprey/libhugetlbfs/hugeutils.c 2010-10-12 17:14:29 UTC (rev
3371)
+++ trunk/osprey/libhugetlbfs/hugeutils.c 2010-10-12 23:07:00 UTC (rev
3372)
@@ -218,76 +218,56 @@
#endif
}
-#define MOUNTS_SZ 4096
+#define LINE_MAXLEN 2048
const char *hugetlbfs_find_path(void)
{
- int err, readerr;
- char *tmp;
- int fd, len;
- char buf[MOUNTS_SZ];
- char mytag[12]; /* to check if the tag is hugetlbfs, so 10 bytes are
enough */
- const char hugetlbtag[]="hugetlbfs";
+ int fd;
+ char line[LINE_MAXLEN + 1];
+ char *eol;
+ int bytes, err;
+ off_t offset;
+
/* Have we already located a mount? */
if (*htlb_mount)
return htlb_mount;
- /* No? Let's see if we've been told where to look */
- tmp = getenv("HUGETLB_PATH");
- if (tmp) {
- err = hugetlbfs_test_path(tmp);
- if (err < 0) {
- ERROR("Can't statfs() \"%s\" (%s)\n",
- tmp, strerror(errno));
- return NULL;
- } else if (err == 0) {
- ERROR("\"%s\" is not a hugetlbfs mount\n", tmp);
- return NULL;
- }
- strncpy(htlb_mount, tmp, sizeof(htlb_mount)-1);
- return htlb_mount;
- }
-
- /* Oh well, let's go searching for a mountpoint */
fd = open("/proc/mounts", O_RDONLY);
if (fd < 0) {
fd = open("/etc/mtab", O_RDONLY);
if (fd < 0) {
ERROR("Couldn't open /proc/mounts or /etc/mtab (%s)\n",
- strerror(errno));
+ strerror(errno));
return NULL;
}
}
- len = read(fd, buf, sizeof(buf));
- readerr = errno;
- close(fd);
- if (len < 0) {
- ERROR("Error reading mounts (%s)\n", strerror(errno));
- return NULL;
- }
- if (len >= sizeof(buf)) {
- ERROR("/proc/mounts is too long\n");
- return NULL;
- }
- buf[sizeof(buf)-1] = '\0';
+ while ((bytes = read(fd, line, LINE_MAXLEN)) > 0) {
+ line[LINE_MAXLEN] = '\0';
+ eol = strchr(line, '\n');
+ if (!eol) {
+ ERROR("Line too long when parsing mounts\n");
+ break;
+ }
- tmp = buf;
- while (tmp) {
- err = sscanf(tmp,
- "%*s %" stringify(PATH_MAX)
- "s %12s ",
- htlb_mount, mytag);
+ /*
+ * Truncate the string to just one line and reset the file
+ * to begin reading at the start of the next line.
+ */
+ *eol = '\0';
+ offset = bytes - (eol + 1 - line);
+ lseek(fd, -offset, SEEK_CUR);
- if ((err == 2) && (strcmp(mytag, hugetlbtag) == 0)
&&(hugetlbfs_test_path(htlb_mount) == 1))
+ err = sscanf(line, "%*s %" stringify(PATH_MAX) "s hugetlbfs ",
+ htlb_mount);
+ if ((err == 1) && (hugetlbfs_test_path(htlb_mount) == 1)) {
+ close(fd);
return htlb_mount;
+ }
memset(htlb_mount, 0, sizeof(htlb_mount));
-
- tmp = strchr(tmp, '\n');
- if (tmp)
- tmp++;
}
+ close(fd);
#if defined(OPEN64_MOD) && defined(M_PAGE)
if (hugepage_m_stype != SIZE_1G)
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