From: Yan, Zheng Date: Tue, 13 Aug 2013 07:42:02 +0000 (+0800) Subject: vfs: call d_op->d_prune() before unhashing dentry X-Git-Tag: v3.12-rc1~141^2~22 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=590fb51f1cf99c4a48a3b1bd65885192e877b561;p=pandora-kernel.git vfs: call d_op->d_prune() before unhashing dentry The d_prune dentry operation is used to notify filesystem when VFS about to prune a hashed dentry from the dcache. There are three code paths that prune dentries: shrink_dcache_for_umount_subtree(), prune_dcache_sb() and d_prune_aliases(). For the d_prune_aliases() case, VFS unhashes the dentry first, then call the d_prune dentry operation. This confuses ceph_d_prune() (ceph uses the d_prune dentry operation to maintain a flag indicating whether the complete contents of a directory are in the dcache, pruning unhashed dentry does not affect dir's completeness) This patch fixes the issue by calling the d_prune dentry operation in d_prune_aliases(), before unhashing the dentry. Also make VFS only call the d_prune dentry operation for hashed dentry, to avoid calling the d_prune dentry operation twice when dentry is pruned by d_prune_aliases(). Signed-off-by: Yan, Zheng Signed-off-by: Al Viro --- Reading git-diff-tree failed