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Subject[PATCH 03/21] vfs: do_last(): common slow lookup
Date
From: Miklos Szeredi <mszeredi@suse.cz>

Make the slow lookup part of O_CREAT and non-O_CREAT opens common.

This allows atomic_open to be hooked into the slow lookup part.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/namei.c | 27 +++++----------------------
1 files changed, 5 insertions(+), 22 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 73e824c..0a56b61 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2241,30 +2241,13 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
symlink_ok = 1;
/* we _can_ be in RCU mode here */
error = lookup_fast(nd, &nd->last, path, &inode);
- if (unlikely(error)) {
- if (error < 0)
- goto exit;
-
- BUG_ON(nd->inode != dir->d_inode);
-
- mutex_lock(&dir->d_inode->i_mutex);
- dentry = __lookup_hash(&nd->last, dir, nd);
- mutex_unlock(&dir->d_inode->i_mutex);
- error = PTR_ERR(dentry);
- if (IS_ERR(dentry))
- goto exit;
- path->mnt = nd->path.mnt;
- path->dentry = dentry;
- error = follow_managed(path, nd->flags);
- if (unlikely(error < 0))
- goto exit_dput;
+ if (likely(!error))
+ goto finish_lookup;

- if (error)
- nd->flags |= LOOKUP_JUMPED;
+ if (error < 0)
+ goto exit;

- inode = path->dentry->d_inode;
- }
- goto finish_lookup;
+ BUG_ON(nd->inode != dir->d_inode);
} else {
/* create side of things */
/*
--
1.7.7


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