Merge branch 'linux-3.6'

This branch adds the required compatibility code to support the
Linux 3.6 kernel.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #873

config/kernel-create-nameidata.m4

@@ -0,0 +1,26 @@
+dnl #
+dnl # 3.6 API change
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_CREATE_NAMEIDATA], [
+	AC_MSG_CHECKING([whether iops->create() takes struct nameidata])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		#ifdef HAVE_MKDIR_UMODE_T
+		int (*inode_create) (struct inode *,struct dentry *,
+		                     umode_t, struct nameidata *) = NULL;
+		#else
+		int (*inode_create) (struct inode *,struct dentry *,
+		                     int, struct nameidata *) = NULL;
+		#endif
+		struct inode_operations iops __attribute__ ((unused)) = {
+			.create		= inode_create,
+		};
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_CREATE_NAMEIDATA, 1,
+		          [iops->create() operation takes nameidata])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-lookup-nameidata.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 3.6 API change
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_LOOKUP_NAMEIDATA], [
+	AC_MSG_CHECKING([whether iops->lookup() takes struct nameidata])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		struct dentry * (*inode_lookup) (struct inode *,struct dentry *,
+		                     struct nameidata *) = NULL;
+		struct inode_operations iops __attribute__ ((unused)) = {
+			.lookup		= inode_lookup,
+		};
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_LOOKUP_NAMEIDATA, 1,
+		          [iops->lookup() operation takes nameidata])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-mkdir-umode-t.m4

@@ -6,19 +6,18 @@ dnl # would also change all three prototypes.  However, if it turns out that
 dnl # some distribution doesn't backport the whole thing this could be
 dnl # broken apart in to three seperate checks.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_CREATE_UMODE_T], [
+AC_DEFUN([ZFS_AC_KERNEL_MKDIR_UMODE_T], [
 	AC_MSG_CHECKING([whether iops->create()/mkdir()/mknod() take umode_t])
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
-		int (*create) (struct inode *, struct dentry *, umode_t,
+		int (*mkdir) (struct inode *,struct dentry *,umode_t) = NULL;
-		    struct nameidata *) = NULL;
 		struct inode_operations iops __attribute__ ((unused)) = {
-			.create = create,
+			.mkdir = mkdir,
 		};
 	],[
 		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_CREATE_UMODE_T, 1,
+		AC_DEFINE(HAVE_MKDIR_UMODE_T, 1,
 		    [iops->create()/mkdir()/mknod() take umode_t])
 	],[
 		AC_MSG_RESULT(no)

config/kernel-sget-args.m4

@@ -0,0 +1,23 @@
+dnl #
+dnl # 3.6 API change,
+dnl # 'sget' now takes the mount flags as an argument.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_5ARG_SGET],
+	[AC_MSG_CHECKING([whether sget() wants 5 args])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+	],[
+		struct file_system_type *type = NULL;
+		int (*test)(struct super_block *,void *) = NULL;
+		int (*set)(struct super_block *,void *) = NULL;
+		int flags = 0;
+		void *data = NULL;
+		(void) sget(type, test, set, flags, data);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_5ARG_SGET, 1, [sget() wants 5 args])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+

config/kernel.m4

@@ -49,8 +49,10 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_NR_CACHED_OBJECTS
 	ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
 	ZFS_AC_KERNEL_FALLOCATE
+	ZFS_AC_KERNEL_MKDIR_UMODE_T
+	ZFS_AC_KERNEL_LOOKUP_NAMEIDATA
+	ZFS_AC_KERNEL_CREATE_NAMEIDATA
 	ZFS_AC_KERNEL_TRUNCATE_RANGE
-	ZFS_AC_KERNEL_CREATE_UMODE_T
 	ZFS_AC_KERNEL_AUTOMOUNT
 	ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
 	ZFS_AC_KERNEL_COMMIT_METADATA
@@ -68,6 +70,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
 	ZFS_AC_KERNEL_SET_NLINK
 	ZFS_AC_KERNEL_ELEVATOR_CHANGE
+	ZFS_AC_KERNEL_5ARG_SGET
 
 	AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
 		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"

include/linux/vfs_compat.h

@@ -115,7 +115,7 @@ set_nlink(struct inode *inode, unsigned int nlink)
  * umode_t type rather than an int.  To cleanly handle both definitions
  * the zpl_umode_t type is introduced and set accordingly.
  */
-#ifdef HAVE_CREATE_UMODE_T
+#ifdef HAVE_MKDIR_UMODE_T
 typedef	umode_t		zpl_umode_t;
 #else
 typedef	int		zpl_umode_t;
@@ -131,4 +131,14 @@ typedef	int		zpl_umode_t;
 #define clear_inode(ip)		end_writeback(ip)
 #endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
 
+/*
+ * 3.6 API change,
+ * The sget() helper function now takes the mount flags as an argument.
+ */
+#ifdef HAVE_5ARG_SGET
+#define zpl_sget(type, cmp, set, fl, mtd)	sget(type, cmp, set, fl, mtd)
+#else
+#define zpl_sget(type, cmp, set, fl, mtd)	sget(type, cmp, set, mtd)
+#endif /* HAVE_5ARG_SGET */
+
 #endif /* _ZFS_VFS_H */

module/zfs/zfs_ctldir.c

@@ -920,8 +920,8 @@ zfsctl_lookup_objset(struct super_block *sb, uint64_t objsetid, zfs_sb_t **zsbp)
 		 * race cannot occur to an expired mount point because
 		 * we hold the zsb->z_ctldir_lock to prevent the race.
 		 */
-		sbp = sget(&zpl_fs_type, zfsctl_test_super,
+		sbp = zpl_sget(&zpl_fs_type, zfsctl_test_super,
-		    zfsctl_set_super, &id);
+		    zfsctl_set_super, 0, &id);
 		if (IS_ERR(sbp)) {
 			error = -PTR_ERR(sbp);
 		} else {

module/zfs/zpl_ctldir.c

@@ -143,7 +143,11 @@ zpl_root_getattr(struct vfsmount *mnt, struct dentry *dentry,
 }
 
 static struct dentry *
+#ifdef HAVE_LOOKUP_NAMEIDATA
 zpl_root_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
+#else
+zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
+#endif
 {
 	cred_t *cr = CRED();
 	struct inode *ip;
@@ -180,8 +184,14 @@ const struct inode_operations zpl_ops_root = {
 };
 
 static struct dentry *
+#ifdef HAVE_LOOKUP_NAMEIDATA
 zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
     struct nameidata *nd)
+#else
+zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
+    unsigned int flags)
+#endif
+
 {
 	cred_t *cr = CRED();
 	struct inode *ip;
@@ -410,8 +420,13 @@ const struct dentry_operations zpl_dops_snapdirs = {
 #endif /* HAVE_AUTOMOUNT */
 
 static struct dentry *
+#ifdef HAVE_LOOKUP_NAMEIDATA
 zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
     struct nameidata *nd)
+#else
+zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
+    unsigned int flags)
+#endif
 {
 	cred_t *cr = CRED();
 	struct inode *ip = NULL;

module/zfs/zpl_inode.c

@@ -31,7 +31,11 @@
 
 
 static struct dentry *
+#ifdef HAVE_LOOKUP_NAMEIDATA
 zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+#else
+zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+#endif
 {
 	cred_t *cr = CRED();
 	struct inode *ip;
@@ -71,8 +75,13 @@ zpl_vap_init(vattr_t *vap, struct inode *dir, struct dentry *dentry,
 }
 
 static int
+#ifdef HAVE_CREATE_NAMEIDATA
 zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
     struct nameidata *nd)
+#else
+zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
+    bool flag)
+#endif
 {
 	cred_t *cr = CRED();
 	struct inode *ip;

module/zfs/zpl_super.c

@@ -316,7 +316,6 @@ const struct super_operations zpl_super_operations = {
 	.delete_inode		= zpl_inode_delete,
 #endif /* HAVE_EVICT_INODE */
 	.put_super		= zpl_put_super,
-	.write_super		= NULL,
 	.sync_fs		= zpl_sync_fs,
 	.statfs			= zpl_statfs,
 	.remount_fs		= zpl_remount_fs,