Re: [PATCH 02/10] orangefs_lookup: simplify

[Mike Marshall <hubcap@omnibond.com>]

Thanks for the cleanup. This runs through xfstests with no regressions
on 4.17-rc7.

Please add: Tested-by: Mike Marshall <hubcap@omnibond.com>

-Mike

On Fri, May 25, 2018 at 7:54 PM, Al Viro <viro@zeniv.linux.org.uk> wrote:
> From: Al Viro <viro@zeniv.linux.org.uk>
>
> d_splice_alias() can handle NULL and ERR_PTR() for inode just fine...
>
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---
>  fs/orangefs/namei.c | 64 +++++++----------------------------------------------
>  1 file changed, 8 insertions(+), 56 deletions(-)
>
> diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
> index 1b5707c44c3f..365cd73d9109 100644
> --- a/fs/orangefs/namei.c
> +++ b/fs/orangefs/namei.c
> @@ -110,7 +110,6 @@ static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
>         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
>         struct orangefs_kernel_op_s *new_op;
>         struct inode *inode;
> -       struct dentry *res;
>         int ret = -EINVAL;
>
>         /*
> @@ -158,65 +157,18 @@ static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
>                      new_op->downcall.resp.lookup.refn.fs_id,
>                      ret);
>
> -       if (ret < 0) {
> -               if (ret == -ENOENT) {
> -                       /*
> -                        * if no inode was found, add a negative dentry to
> -                        * dcache anyway; if we don't, we don't hold expected
> -                        * lookup semantics and we most noticeably break
> -                        * during directory renames.
> -                        *
> -                        * however, if the operation failed or exited, do not
> -                        * add the dentry (e.g. in the case that a touch is
> -                        * issued on a file that already exists that was
> -                        * interrupted during this lookup -- no need to add
> -                        * another negative dentry for an existing file)
> -                        */
> -
> -                       gossip_debug(GOSSIP_NAME_DEBUG,
> -                                    "orangefs_lookup: Adding *negative* dentry "
> -                                    "%p for %pd\n",
> -                                    dentry,
> -                                    dentry);
> -
> -                       d_add(dentry, NULL);
> -                       res = NULL;
> -                       goto out;
> -               }
> -
> +       if (ret >= 0) {
> +               orangefs_set_timeout(dentry);
> +               inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
> +       } else if (ret == -ENOENT) {
> +               inode = NULL;
> +       } else {
>                 /* must be a non-recoverable error */
> -               res = ERR_PTR(ret);
> -               goto out;
> -       }
> -
> -       orangefs_set_timeout(dentry);
> -
> -       inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
> -       if (IS_ERR(inode)) {
> -               gossip_debug(GOSSIP_NAME_DEBUG,
> -                       "error %ld from iget\n", PTR_ERR(inode));
> -               res = ERR_CAST(inode);
> -               goto out;
> +               inode = ERR_PTR(ret);
>         }
>
> -       gossip_debug(GOSSIP_NAME_DEBUG,
> -                    "%s:%s:%d "
> -                    "Found good inode [%lu] with count [%d]\n",
> -                    __FILE__,
> -                    __func__,
> -                    __LINE__,
> -                    inode->i_ino,
> -                    (int)atomic_read(&inode->i_count));
> -
> -       /* update dentry/inode pair into dcache */
> -       res = d_splice_alias(inode, dentry);
> -
> -       gossip_debug(GOSSIP_NAME_DEBUG,
> -                    "Lookup success (inode ct = %d)\n",
> -                    (int)atomic_read(&inode->i_count));
> -out:
>         op_release(new_op);
> -       return res;
> +       return d_splice_alias(inode, dentry);
>  }
>
>  /* return 0 on success; non-zero otherwise */
> --
> 2.11.0
>