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authorChristoph Hellwig <hch@infradead.org>2011-04-25 14:01:36 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-04-25 18:14:10 -0700
commit1879fd6a26571fd4e8e1f4bb3e7537bc936b1fe7 (patch)
tree5fb41fdaef01d462ff9c7ecfe688760a44e89b6a /fs/dcache.c
parent3dd2ee4824b668a635d6d2bb6bc73f33708cab9f (diff)
downloadlinux-next-1879fd6a26571fd4e8e1f4bb3e7537bc936b1fe7.tar.gz
add hlist_bl_lock/unlock helpers
Now that the whole dcache_hash_bucket crap is gone, go all the way and also remove the weird locking layering violations for locking the hash buckets. Add hlist_bl_lock/unlock helpers to move the locking into the list abstraction instead of requiring each caller to open code it. After all allowing for the bit locks is the whole point of these helpers over the plain hlist variant. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c22
1 files changed, 6 insertions, 16 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index d600a0af3b2e..22a0ef41bad1 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -109,16 +109,6 @@ static inline struct hlist_bl_head *d_hash(struct dentry *parent,
return dentry_hashtable + (hash & D_HASHMASK);
}
-static inline void spin_lock_bucket(struct hlist_bl_head *b)
-{
- bit_spin_lock(0, (unsigned long *)&b->first);
-}
-
-static inline void spin_unlock_bucket(struct hlist_bl_head *b)
-{
- __bit_spin_unlock(0, (unsigned long *)&b->first);
-}
-
/* Statistics gathering. */
struct dentry_stat_t dentry_stat = {
.age_limit = 45,
@@ -334,10 +324,10 @@ void __d_drop(struct dentry *dentry)
else
b = d_hash(dentry->d_parent, dentry->d_name.hash);
- spin_lock_bucket(b);
+ hlist_bl_lock(b);
__hlist_bl_del(&dentry->d_hash);
dentry->d_hash.pprev = NULL;
- spin_unlock_bucket(b);
+ hlist_bl_unlock(b);
dentry_rcuwalk_barrier(dentry);
}
@@ -1594,9 +1584,9 @@ struct dentry *d_obtain_alias(struct inode *inode)
tmp->d_inode = inode;
tmp->d_flags |= DCACHE_DISCONNECTED;
list_add(&tmp->d_alias, &inode->i_dentry);
- spin_lock_bucket(&tmp->d_sb->s_anon);
+ hlist_bl_lock(&tmp->d_sb->s_anon);
hlist_bl_add_head(&tmp->d_hash, &tmp->d_sb->s_anon);
- spin_unlock_bucket(&tmp->d_sb->s_anon);
+ hlist_bl_unlock(&tmp->d_sb->s_anon);
spin_unlock(&tmp->d_lock);
spin_unlock(&inode->i_lock);
security_d_instantiate(tmp, inode);
@@ -2076,10 +2066,10 @@ EXPORT_SYMBOL(d_delete);
static void __d_rehash(struct dentry * entry, struct hlist_bl_head *b)
{
BUG_ON(!d_unhashed(entry));
- spin_lock_bucket(b);
+ hlist_bl_lock(b);
entry->d_flags |= DCACHE_RCUACCESS;
hlist_bl_add_head_rcu(&entry->d_hash, b);
- spin_unlock_bucket(b);
+ hlist_bl_unlock(b);
}
static void _d_rehash(struct dentry * entry)