nfsd: allow deprecated interface to be compiled out.

Add CONFIG_NFSD_DEPRECATED, default to y.
Only include deprecated interface if this is defined.
This allows distros to remove this interface before the official
removal, and allows developers to test without it.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/Makefile b/fs/Makefile
index e6ec1d3..26956fc 100644 (file)
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -29,10 +29,7 @@ obj-$(CONFIG_EVENTFD)                += eventfd.o
 obj-$(CONFIG_AIO)               += aio.o
 obj-$(CONFIG_FILE_LOCKING)      += locks.o
 obj-$(CONFIG_COMPAT)           += compat.o compat_ioctl.o
-
-nfsd-$(CONFIG_NFSD)            := nfsctl.o
-obj-y                          += $(nfsd-y) $(nfsd-m)
-
+obj-$(CONFIG_NFSD_DEPRECATED)  += nfsctl.o
 obj-$(CONFIG_BINFMT_AOUT)      += binfmt_aout.o
 obj-$(CONFIG_BINFMT_EM86)      += binfmt_em86.o
 obj-$(CONFIG_BINFMT_MISC)      += binfmt_misc.o

diff --git a/fs/compat.c b/fs/compat.c
index 718c706..df5e671 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1963,7 +1963,7 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 }
 #endif /* HAVE_SET_RESTORE_SIGMASK */
 
-#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
+#if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
 /* Stuff for NFS server syscalls... */
 struct compat_nfsctl_svc {
        u16                     svc32_port;

diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index 4264377..18b3e89 100644 (file)
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -28,6 +28,18 @@ config NFSD
 
          If unsure, say N.
 
+config NFSD_DEPRECATED
+       bool "Include support for deprecated syscall interface to NFSD"
+       depends on NFSD
+       default y
+       help
+         The syscall interface to nfsd was obsoleted in 2.6.0 by a new
+         filesystem based interface.  The old interface is due for removal
+         in 2.6.40.  If you wish to remove the interface before then
+         say N.
+
+         In unsure, say Y.
+
 config NFSD_V2_ACL
        bool
        depends on NFSD

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index e56827b..a3c7d0c 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -28,9 +28,6 @@
 typedef struct auth_domain     svc_client;
 typedef struct svc_export      svc_export;
 
-static void            exp_do_unexport(svc_export *unexp);
-static int             exp_verify_string(char *cp, int max);
-
 /*
  * We have two caches.
  * One maps client+vfsmnt+dentry to export options - the export map
@@ -802,6 +799,7 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
        return ek;
 }
 
+#ifdef CONFIG_NFSD_DEPRECATED
 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
                       struct svc_export *exp)
 {
@@ -852,6 +850,7 @@ exp_get_fsid_key(svc_client *clp, int fsid)
 
        return exp_find_key(clp, FSID_NUM, fsidv, NULL);
 }
+#endif
 
 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
                                     struct cache_req *reqp)
@@ -893,6 +892,7 @@ static struct svc_export *exp_parent(svc_client *clp, struct path *path)
        return exp;
 }
 
+#ifdef CONFIG_NFSD_DEPRECATED
 /*
  * Hashtable locking. Write locks are placed only by user processes
  * wanting to modify export information.
@@ -925,6 +925,19 @@ exp_writeunlock(void)
 {
        up_write(&hash_sem);
 }
+#else
+
+/* hash_sem not needed once deprecated interface is removed */
+void exp_readlock(void) {}
+static inline void exp_writelock(void){}
+void exp_readunlock(void) {}
+static inline void exp_writeunlock(void){}
+
+#endif
+
+#ifdef CONFIG_NFSD_DEPRECATED
+static void            exp_do_unexport(svc_export *unexp);
+static int             exp_verify_string(char *cp, int max);
 
 static void exp_fsid_unhash(struct svc_export *exp)
 {
@@ -1147,6 +1160,7 @@ out_unlock:
        exp_writeunlock();
        return err;
 }
+#endif /* CONFIG_NFSD_DEPRECATED */
 
 /*
  * Obtain the root fh on behalf of a client.
@@ -1529,6 +1543,7 @@ const struct seq_operations nfs_exports_op = {
        .show   = e_show,
 };
 
+#ifdef CONFIG_NFSD_DEPRECATED
 /*
  * Add or modify a client.
  * Change requests may involve the list of host addresses. The list of
@@ -1618,6 +1633,7 @@ exp_verify_string(char *cp, int max)
        printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
        return 0;
 }
+#endif /* CONFIG_NFSD_DEPRECATED */
 
 /*
  * Initialize the exports module.

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7f0fc88..b278e44 100644 (file)
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -22,6 +22,7 @@
  */
 enum {
        NFSD_Root = 1,
+#ifdef CONFIG_NFSD_DEPRECATED
        NFSD_Svc,
        NFSD_Add,
        NFSD_Del,
@@ -29,6 +30,7 @@ enum {
        NFSD_Unexport,
        NFSD_Getfd,
        NFSD_Getfs,
+#endif
        NFSD_List,
        NFSD_Export_features,
        NFSD_Fh,
@@ -54,6 +56,7 @@ enum {
 /*
  * write() for these nodes.
  */
+#ifdef CONFIG_NFSD_DEPRECATED
 static ssize_t write_svc(struct file *file, char *buf, size_t size);
 static ssize_t write_add(struct file *file, char *buf, size_t size);
 static ssize_t write_del(struct file *file, char *buf, size_t size);
@@ -61,6 +64,7 @@ static ssize_t write_export(struct file *file, char *buf, size_t size);
 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
+#endif
 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
@@ -76,6 +80,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 #endif
 
 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
+#ifdef CONFIG_NFSD_DEPRECATED
        [NFSD_Svc] = write_svc,
        [NFSD_Add] = write_add,
        [NFSD_Del] = write_del,
@@ -83,6 +88,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
        [NFSD_Unexport] = write_unexport,
        [NFSD_Getfd] = write_getfd,
        [NFSD_Getfs] = write_getfs,
+#endif
        [NFSD_Fh] = write_filehandle,
        [NFSD_FO_UnlockIP] = write_unlock_ip,
        [NFSD_FO_UnlockFS] = write_unlock_fs,
@@ -196,6 +202,7 @@ static const struct file_operations pool_stats_operations = {
  * payload - write methods
  */
 
+#ifdef CONFIG_NFSD_DEPRECATED
 /**
  * write_svc - Start kernel's NFSD server
  *
@@ -491,6 +498,7 @@ static ssize_t write_getfd(struct file *file, char *buf, size_t size)
  out:
        return err;
 }
+#endif /* CONFIG_NFSD_DEPRECATED */
 
 /**
  * write_unlock_ip - Release all locks used by a client
@@ -1365,6 +1373,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 {
        static struct tree_descr nfsd_files[] = {
+#ifdef CONFIG_NFSD_DEPRECATED
                [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
                [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
                [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
@@ -1372,6 +1381,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
                [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
                [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
                [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
+#endif
                [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
                [NFSD_Export_features] = {"export_features",
                                        &export_features_operations, S_IRUGO},