path_init(): set nd->inode earlier in cwd-relative case
that allows to kill the recheck of nd->seq on the way out in
this case, and this check on the way out is left only for
absolute pathnames.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index f89fe5f..a08018b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2028,6 +2028,15 @@
path_get(&nd->root);
nd->path = nd->root;
}
+ nd->inode = nd->path.dentry->d_inode;
+ if (!(flags & LOOKUP_RCU))
+ return s;
+ if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq)))
+ return s;
+ if (!(nd->flags & LOOKUP_ROOT))
+ nd->root.mnt = NULL;
+ rcu_read_unlock();
+ return ERR_PTR(-ECHILD);
} else if (nd->dfd == AT_FDCWD) {
if (flags & LOOKUP_RCU) {
struct fs_struct *fs = current->fs;
@@ -2038,11 +2047,14 @@
do {
seq = read_seqcount_begin(&fs->seq);
nd->path = fs->pwd;
+ nd->inode = nd->path.dentry->d_inode;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
} while (read_seqcount_retry(&fs->seq, seq));
} else {
get_fs_pwd(current->fs, &nd->path);
+ nd->inode = nd->path.dentry->d_inode;
}
+ return s;
} else {
/* Caller must check execute permissions on the starting path component */
struct fd f = fdget_raw(nd->dfd);
@@ -2072,16 +2084,6 @@
fdput(f);
return s;
}
-
- nd->inode = nd->path.dentry->d_inode;
- if (!(flags & LOOKUP_RCU))
- return s;
- if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq)))
- return s;
- if (!(nd->flags & LOOKUP_ROOT))
- nd->root.mnt = NULL;
- rcu_read_unlock();
- return ERR_PTR(-ECHILD);
}
static const char *trailing_symlink(struct nameidata *nd)