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mount and umount could leak loop device allocations causing the system to

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quickly run out.  Also disable init's SIGHUP handler during shutdown.
 -Erik
This commit is contained in:
Erik Andersen
2000-01-26 20:06:48 +00:00
parent 3fe39dce5d
commit 5cbdd712f5
11 changed files with 266 additions and 264 deletions
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68
util-linux/umount.c
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@ -28,14 +28,6 @@
#include <fstab.h>
#include <errno.h>
#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/loop.h>
static int del_loop(const char *device);
#endif
static const char umount_usage[] =
"umount [flags] filesystem|directory\n\n"
"Flags:\n"
@ -52,43 +44,34 @@ static int useMtab = TRUE;
static int umountAll = FALSE;
extern const char mtab_file[]; /* Defined in utility.c */
#define MIN(x,y) (x > y ? x : y)
static int
do_umount(const char* name, int useMtab)
{
int status;
struct mntent *m;
FILE *mountTable;
const char *blockDevice = NULL;
#if defined BB_FEATURE_MOUNT_LOOP
/* check to see if this is a loop device */
struct stat fst;
char dev[20];
const char *oldname = NULL;
int i;
if (stat(name, &fst)) {
fprintf(stderr, "umount: %s: %s\n", name, strerror(errno));
exit(1);
}
for (i = 0 ; i <= 7 ; i++) {
struct stat lst;
sprintf(dev, "/dev/loop%d", i);
if (stat(dev, &lst))
continue;
if (lst.st_dev == fst.st_dev) {
oldname = name;
name = dev;
break;
if ((mountTable = setmntent (mtab_file, "r"))) {
while ((m = getmntent (mountTable)) != 0) {
if (strncmp(m->mnt_dir, name,
MIN(strlen(m->mnt_dir),strlen(name))) == 0)
blockDevice = m->mnt_fsname;
else if (strcmp(m->mnt_fsname, name) == 0) {
blockDevice = name;
name = m->mnt_dir;
}
}
}
#endif
status = umount(name);
#if defined BB_FEATURE_MOUNT_LOOP
if (!strncmp("/dev/loop", name, 9)) { /* this was a loop device, delete it */
del_loop(name);
if (oldname != NULL)
name = oldname;
}
if (blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
/* this was a loop device, delete it */
del_loop(blockDevice);
#endif
#if defined BB_MTAB
if ( status == 0 ) {
@ -178,20 +161,3 @@ umount_main(int argc, char** argv)
}
}
#if defined BB_FEATURE_MOUNT_LOOP
static int del_loop(const char *device)
{
int fd;
if ((fd = open(device, O_RDONLY)) < 0) {
perror(device);
exit(1);
}
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
perror("ioctl: LOOP_CLR_FD");
exit(1);
}
close(fd);
return(0);
}
#endif