jbd2: move bdget out of critical section
bdget() should not be called when we hold spinlocks since
it might sleep.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Zhu Yanhai <gaoyang.zyh@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 90407b8..33dd3ef 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2413,10 +2413,12 @@
new_dev = kmalloc(sizeof(struct devname_cache), GFP_KERNEL);
if (!new_dev)
return "NODEV-ALLOCFAILURE"; /* Something non-NULL */
+ bd = bdget(device);
spin_lock(&devname_cache_lock);
if (devcache[i]) {
if (devcache[i]->device == device) {
kfree(new_dev);
+ bdput(bd);
ret = devcache[i]->devname;
spin_unlock(&devname_cache_lock);
return ret;
@@ -2425,7 +2427,6 @@
}
devcache[i] = new_dev;
devcache[i]->device = device;
- bd = bdget(device);
if (bd) {
bdevname(bd, devcache[i]->devname);
bdput(bd);