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authorTheodore Ts'o <tytso@mit.edu>2011-07-10 22:05:08 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-07-10 22:05:08 -0400
commit4862fd6047ed02e2726667c54d35f538eecc56aa (patch)
treefc97f075946120157c63f48e283a5d753d22763a /fs/jbd2/journal.c
parent575a1d4bdfa2ea9fc10733013136145b497e1be0 (diff)
downloadop-kernel-dev-4862fd6047ed02e2726667c54d35f538eecc56aa.zip
op-kernel-dev-4862fd6047ed02e2726667c54d35f538eecc56aa.tar.gz
jbd2: remove jbd2_dev_to_name() from jbd2 tracepoints
Using function calls in TP_printk causes perf heartburn, so print the MAJOR/MINOR device numbers instead. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/journal.c')
-rw-r--r--fs/jbd2/journal.c67
1 files changed, 0 insertions, 67 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 0dfa5b59..f24df13 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2390,73 +2390,6 @@ static void __exit journal_exit(void)
jbd2_journal_destroy_caches();
}
-/*
- * jbd2_dev_to_name is a utility function used by the jbd2 and ext4
- * tracing infrastructure to map a dev_t to a device name.
- *
- * The caller should use rcu_read_lock() in order to make sure the
- * device name stays valid until its done with it. We use
- * rcu_read_lock() as well to make sure we're safe in case the caller
- * gets sloppy, and because rcu_read_lock() is cheap and can be safely
- * nested.
- */
-struct devname_cache {
- struct rcu_head rcu;
- dev_t device;
- char devname[BDEVNAME_SIZE];
-};
-#define CACHE_SIZE_BITS 6
-static struct devname_cache *devcache[1 << CACHE_SIZE_BITS];
-static DEFINE_SPINLOCK(devname_cache_lock);
-
-static void free_devcache(struct rcu_head *rcu)
-{
- kfree(rcu);
-}
-
-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) {
- ret = devcache[i]->devname;
- rcu_read_unlock();
- return ret;
- }
- rcu_read_unlock();
-
- 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;
- }
- call_rcu(&devcache[i]->rcu, free_devcache);
- }
- devcache[i] = new_dev;
- devcache[i]->device = device;
- if (bd) {
- bdevname(bd, devcache[i]->devname);
- bdput(bd);
- } else
- __bdevname(device, devcache[i]->devname);
- ret = devcache[i]->devname;
- spin_unlock(&devname_cache_lock);
- return ret;
-}
-EXPORT_SYMBOL(jbd2_dev_to_name);
-
MODULE_LICENSE("GPL");
module_init(journal_init);
module_exit(journal_exit);
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