From b23fb0a60379a95e10c671f646b259ea2558421e Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Fri, 7 Jan 2011 17:49:35 +1100 Subject: fs: scale inode alias list Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list from concurrent modification. d_alias is also protected by d_lock. Signed-off-by: Nick Piggin --- fs/exportfs/expfs.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/exportfs/expfs.c') diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 51b304056f10..84b8c460a781 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -48,8 +48,10 @@ find_acceptable_alias(struct dentry *result, return result; spin_lock(&dcache_lock); + spin_lock(&dcache_inode_lock); list_for_each_entry(dentry, &result->d_inode->i_dentry, d_alias) { dget_locked(dentry); + spin_unlock(&dcache_inode_lock); spin_unlock(&dcache_lock); if (toput) dput(toput); @@ -58,8 +60,10 @@ find_acceptable_alias(struct dentry *result, return dentry; } spin_lock(&dcache_lock); + spin_lock(&dcache_inode_lock); toput = dentry; } + spin_unlock(&dcache_inode_lock); spin_unlock(&dcache_lock); if (toput) -- cgit v1.2.1