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authorTheodore Ts'o <tytso@mit.edu>2009-06-20 23:34:44 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-06-20 23:34:44 -0400
commitb574480507460b8e31b8d38dd4642219fc3b9a10 (patch)
tree666d731d897ce463fcc6ccf46e82f200ae18e589 /fs/jbd2
parent627ad9fd0733f0a31a266ff98a4a933eee710f0b (diff)
downloadlwn-b574480507460b8e31b8d38dd4642219fc3b9a10.tar.gz
lwn-b574480507460b8e31b8d38dd4642219fc3b9a10.zip
jbd2: Remove GFP_ATOMIC kmalloc from inside spinlock critical region
Fix jbd2_dev_to_name(), a function used when pretty-printting jbd2 and ext4 tracepoints. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/journal.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 18bfd5dab642..7b545c3b3942 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2410,6 +2410,7 @@ const char *jbd2_dev_to_name(dev_t device)
int i = hash_32(device, CACHE_SIZE_BITS);
char *ret;
struct block_device *bd;
+ static struct devname_cache *new_dev;
rcu_read_lock();
if (devcache[i] && devcache[i]->device == device) {
@@ -2419,20 +2420,20 @@ const char *jbd2_dev_to_name(dev_t device)
}
rcu_read_unlock();
+ new_dev = kmalloc(sizeof(struct devname_cache), GFP_KERNEL);
+ if (!new_dev)
+ return "NODEV-ALLOCFAILURE"; /* Something non-NULL */
spin_lock(&devname_cache_lock);
if (devcache[i]) {
if (devcache[i]->device == device) {
+ kfree(new_dev);
ret = devcache[i]->devname;
spin_unlock(&devname_cache_lock);
return ret;
}
call_rcu(&devcache[i]->rcu, free_devcache);
}
- devcache[i] = kmalloc(sizeof(struct devname_cache), GFP_KERNEL);
- if (!devcache[i]) {
- spin_unlock(&devname_cache_lock);
- return "NODEV-ALLOCFAILURE"; /* Something non-NULL */
- }
+ devcache[i] = new_dev;
devcache[i]->device = device;
bd = bdget(device);
if (bd) {