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call_usermodehelper() should wait for process

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As of Linux 3.4 the UMH_WAIT_* constants were renumbered.  In
particular, the meaning of "1" changed from UMH_WAIT_PROC (wait for
process to complete), to UMH_WAIT_EXEC (wait for the exec, but not the
process).  A number of call sites used the number 1 instead of the
constant name, so the behavior was not as expected on kernels with this
change.

One visible consequence of this change was that processes accessing
automounted snapshots received an ELOOP error because they failed to
wait for zfs.mount to complete.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #816
This commit is contained in:
Ned Bass
2013-01-09 15:46:31 -08:00
committed by Brian Behlendorf
parent 1c50c992ba
commit 761394b3af
3 changed files with 4 additions and 4 deletions
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module/zfs/vdev_disk.c
+1 -1
View File
@@ -159,7 +159,7 @@ vdev_elevator_switch(vdev_t *v, char *elevator)
char *envp[] = { NULL };
argv[2] = kmem_asprintf(SET_SCHEDULER_CMD, device, elevator);
error = call_usermodehelper(argv[0], argv, envp, 1);
error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
strfree(argv[2]);
}
#endif /* HAVE_ELEVATOR_CHANGE */
module/zfs/zfs_ctldir.c
+2 -2
View File
@@ -696,7 +696,7 @@ __zfsctl_unmount_snapshot(zfs_snapentry_t *sep, int flags)
argv[2] = kmem_asprintf(SET_UNMOUNT_CMD,
flags & MNT_FORCE ? "-f " : "", sep->se_path);
error = call_usermodehelper(argv[0], argv, envp, 1);
error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
strfree(argv[2]);
/*
@@ -822,7 +822,7 @@ zfsctl_mount_snapshot(struct path *path, int flags)
* to safely abort the automount. This should be very rare.
*/
argv[2] = kmem_asprintf(SET_MOUNT_CMD, full_name, full_path);
error = call_usermodehelper(argv[0], argv, envp, 1);
error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
strfree(argv[2]);
if (error) {
printk("ZFS: Unable to automount %s at %s: %d\n",