Re: [RFC][PATCH 11/20] elevate write count over calls to vfs_rename()

[Dave Hansen <haveblue@us.ibm.com>]

On Sun, 2006-06-18 at 19:23 +0100, Al Viro wrote:
> 	a) nfsd_rename() should check that tfhp->fh_export->ex_mnt ==
> ffhp->fh_export->ex_mnt (if not that tfhp->fh_export == ffhp->fh_export)
> instead of comparing ->i_sb
> 	b) that patch should do mnt_want_write() only once.

Here's a replacement.

diff -puN fs/nfsd/vfs.c~C-elevate-writers-vfs_rename-part1 fs/nfsd/vfs.c
--- lxc/fs/nfsd/vfs.c~C-elevate-writers-vfs_rename-part1        2006-06-19 08:43:10.000000000 -0700
+++ lxc-dave/fs/nfsd/vfs.c      2006-06-19 10:09:19.000000000 -0700
@@ -1597,13 +1597,21 @@ nfsd_rename(struct svc_rqst *rqstp, stru
                        err = -EPERM;
        } else
 #endif
+       err = -EXDEV
+       if (ffhp->fh_export->ex_mnt != tfhp->fh_export->ex_mnt)
+               goto out_dput_new;
+
+       err = mnt_want_write(ffhp->fh_export->ex_mnt);
+       if (err)
+               goto out_dput_new;
+
        err = vfs_rename(fdir, odentry, tdir, ndentry);
        if (!err && EX_ISSYNC(tfhp->fh_export)) {
                err = nfsd_sync_dir(tdentry);
                if (!err)
                        err = nfsd_sync_dir(fdentry);
        }
-
+       mnt_drop_write(ffhp->fh_export->ex_mnt);
  out_dput_new:
        dput(ndentry);
  out_dput_old:



-- Dave

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