Track negative entries v3

Track negative dentries by recording the generation number of the parent
directory in d_fsdata. The generation number for the parent directory is
recorded in the inode_info, which increments every time the lock on the
directory is dropped.

If the generation number of the parent directory and the negative dentry
matches, there is no need to perform the revalidate, else a revalidate
is forced. This improves performance in situations where nodes look for
the same non-existent file multiple times.

Thanks Mark for explaining the DLM sequence.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 5e02a893f46e..e8d94d722ecb 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -3635,10 +3635,18 @@ static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
 {
         struct inode *inode;
         struct address_space *mapping;
+        struct ocfs2_inode_info *oi;
 
         inode = ocfs2_lock_res_inode(lockres);
         mapping = inode->i_mapping;
 
+        if (S_ISDIR(inode->i_mode)) {
+                oi = OCFS2_I(inode);
+                oi->ip_dir_lock_gen++;
+                mlog(0, "generation: %u\n", oi->ip_dir_lock_gen);
+                goto out;
+        }
+
         if (!S_ISREG(inode->i_mode))
                 goto out;