Monitor: release /proc/mdstat fd when no arrays present

If md kernel module is reloaded, /proc/mdstat cannot be accessed ("cat:
/proc/mdstat: No such file or directory"). The reason is mdadm monitor
still holds a file descriptor to previous /proc/mdstat instance. It
leads to really confusing outcome of the following operations - mdadm
seems to run without errors, however some udev rules don't get executed
and new array doesn't work.

Add a check if lseek was successful as it fails if md kernel module has
been unloaded - close a file descriptor then. The problem is mdadm
monitor doesn't always do it before next operation takes place. To
prevent it monitor always releases /proc/mdstat descriptor when there
are no arrays to be monitored, just in case driver unload happens in a
moment.

Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/mdstat.c b/mdstat.c
index 2972cdf6..39628967 100644
--- a/mdstat.c
+++ b/mdstat.c
@@ -133,7 +133,11 @@ struct mdstat_ent *mdstat_read(int hold, int start)
 	int fd;
 
 	if (hold && mdstat_fd != -1) {
-		lseek(mdstat_fd, 0L, 0);
+		off_t offset = lseek(mdstat_fd, 0L, 0);
+		if (offset == (off_t)-1) {
+			mdstat_close();
+			return NULL;
+		}
 		fd = dup(mdstat_fd);
 		if (fd >= 0)
 			f = fdopen(fd, "r");