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 <npiggin@kernel.dk>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 589f3e3..0036983 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -810,12 +810,15 @@
struct dentry *dentry;
spin_lock(&dcache_lock);
+ spin_lock(&dcache_inode_lock);
list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
+ spin_unlock(&dcache_inode_lock);
spin_unlock(&dcache_lock);
return true;
}
}
+ spin_unlock(&dcache_inode_lock);
spin_unlock(&dcache_lock);
return false;
}