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authorDavid Teigland <teigland@redhat.com>2008-01-09 10:37:39 -0600
committerDavid Teigland <teigland@redhat.com>2008-01-30 11:04:42 -0600
commit755b5eb8bac90b35dc901465a06081aaad94e9ae (patch)
tree95fcee45218437aa2fbc17642feece9310f25abe
parent42dc1601a9a31e8da767a4a9c37bad844b3698ab (diff)
downloadlinux-755b5eb8bac90b35dc901465a06081aaad94e9ae.tar.gz
dlm: limit dir lookup loop
In a rare case we may need to repeat a local resource directory lookup due to a race with removing the rsb and removing the resdir record. We'll never need to do more than a single additional lookup, though, so the infinite loop around the lookup can be removed. In addition to being unnecessary, the infinite loop is dangerous since some other unknown condition may appear causing the loop to never break. Signed-off-by: David Teigland <teigland@redhat.com>
-rw-r--r--fs/dlm/lock.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index fa68e9b9365..bc2e4ba4c1b 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -1851,7 +1851,7 @@ static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb)
static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb)
{
struct dlm_ls *ls = r->res_ls;
- int error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid();
+ int i, error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid();
if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) {
rsb_clear_flag(r, RSB_MASTER_UNCERTAIN);
@@ -1885,7 +1885,7 @@ static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb)
return 1;
}
- for (;;) {
+ for (i = 0; i < 2; i++) {
/* It's possible for dlm_scand to remove an old rsb for
this same resource from the toss list, us to create
a new one, look up the master locally, and find it
@@ -1899,6 +1899,8 @@ static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb)
log_debug(ls, "dir_lookup error %d %s", error, r->res_name);
schedule();
}
+ if (error && error != -EEXIST)
+ return error;
if (ret_nodeid == our_nodeid) {
r->res_first_lkid = 0;