From f0ed8401e854e1cbd23b2fb5dca5e88dec2df7c4 Mon Sep 17 00:00:00 2001 From: Ben Myers Date: Fri, 3 Apr 2009 15:13:10 -0400 Subject: Mountd should use separate lockfiles Mountd keeps file descriptors used for locks separate from those used for io and seems to assume that the lock will only be released on close of the file descriptor that was used with fcntl. Actually the lock is released when any file descriptor for that file is closed. When setexportent() is called after xflock() he closes and reopens the io file descriptor and defeats the lock. This patch fixes that by using a separate file for locking, cleaning them up when finished. Signed-off-by: Ben Myers Signed-off-by: Steve Dickson --- utils/mountd/mountd.c | 10 ++++++++++ utils/mountd/rmtab.c | 8 ++++---- 2 files changed, 14 insertions(+), 4 deletions(-) (limited to 'utils') diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c index 8084359..25d292b 100644 --- a/utils/mountd/mountd.c +++ b/utils/mountd/mountd.c @@ -88,6 +88,14 @@ unregister_services (void) pmap_unset (MOUNTPROG, MOUNTVERS_NFSV3); } +static void +cleanup_lockfiles (void) +{ + unlink(_PATH_XTABLCK); + unlink(_PATH_ETABLCK); + unlink(_PATH_RMTABLCK); +} + /* Wait for all worker child processes to exit and reap them */ static void wait_for_workers (void) @@ -154,6 +162,7 @@ fork_workers(void) /* in parent */ wait_for_workers(); unregister_services(); + cleanup_lockfiles(); xlog(L_NOTICE, "mountd: no more workers, exiting\n"); exit(0); } @@ -170,6 +179,7 @@ killer (int sig) kill(0, SIGTERM); wait_for_workers(); } + cleanup_lockfiles(); xlog (L_FATAL, "Caught signal %d, un-registering and exiting.", sig); } diff --git a/utils/mountd/rmtab.c b/utils/mountd/rmtab.c index 5787ed6..c371f8d 100644 --- a/utils/mountd/rmtab.c +++ b/utils/mountd/rmtab.c @@ -58,7 +58,7 @@ mountlist_add(char *host, const char *path) int lockid; long pos; - if ((lockid = xflock(_PATH_RMTAB, "a")) < 0) + if ((lockid = xflock(_PATH_RMTABLCK, "a")) < 0) return; setrmtabent("r+"); while ((rep = getrmtabent(1, &pos)) != NULL) { @@ -98,7 +98,7 @@ mountlist_del(char *hname, const char *path) int lockid; int match; - if ((lockid = xflock(_PATH_RMTAB, "w")) < 0) + if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0) return; if (!setrmtabent("r")) { xfunlock(lockid); @@ -139,7 +139,7 @@ mountlist_del_all(struct sockaddr_in *sin) FILE *fp; int lockid; - if ((lockid = xflock(_PATH_RMTAB, "w")) < 0) + if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0) return; if (!(hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { xlog(L_ERROR, "can't get hostname of %s", inet_ntoa(addr)); @@ -188,7 +188,7 @@ mountlist_list(void) struct in_addr addr; struct hostent *he; - if ((lockid = xflock(_PATH_RMTAB, "r")) < 0) + if ((lockid = xflock(_PATH_RMTABLCK, "r")) < 0) return NULL; if (stat(_PATH_RMTAB, &stb) < 0) { xlog(L_ERROR, "can't stat %s", _PATH_RMTAB); -- cgit