[PATCH] r/o bind mounts: elevate write count for rmdir and unlink.

[deliverable/linux.git] / fs / nfsd / vfs.c

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 46f59d5365a0d49986512c54a25ecdc6daeb54f1..efff58a5818c6143d76d19c4b4c5951a4431b170 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1750,6 +1750,10 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
        if (!type)
                type = rdentry->d_inode->i_mode & S_IFMT;
 
+       host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+       if (host_err)
+               goto out_nfserr;
+
        if (type != S_IFDIR) { /* It's UNLINK */
 #ifdef MSNFS
                if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
@@ -1765,10 +1769,12 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
        dput(rdentry);
 
        if (host_err)
-               goto out_nfserr;
+               goto out_drop;
        if (EX_ISSYNC(fhp->fh_export))
                host_err = nfsd_sync_dir(dentry);
 
+out_drop:
+       mnt_drop_write(fhp->fh_export->ex_path.mnt);
 out_nfserr:
        err = nfserrno(host_err);
 out: