Merge commit 'nilfs2/for-next'

3 files changed, 49 insertions, 30 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index a97263be6a91..0e7da7bb5d93 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -186,32 +186,7 @@ source "fs/romfs/Kconfig"
 source "fs/sysv/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/exofs/Kconfig"
-
-config NILFS2_FS
-	tristate "NILFS2 file system support (EXPERIMENTAL)"
-	depends on BLOCK && EXPERIMENTAL
-	select CRC32
-	help
-	  NILFS2 is a log-structured file system (LFS) supporting continuous
-	  snapshotting.  In addition to versioning capability of the entire
-	  file system, users can even restore files mistakenly overwritten or
-	  destroyed just a few seconds ago.  Since this file system can keep
-	  consistency like conventional LFS, it achieves quick recovery after
-	  system crashes.
-
-	  NILFS2 creates a number of checkpoints every few seconds or per
-	  synchronous write basis (unless there is no change).  Users can
-	  select significant versions among continuously created checkpoints,
-	  and can change them into snapshots which will be preserved for long
-	  periods until they are changed back to checkpoints.  Each
-	  snapshot is mountable as a read-only file system concurrently with
-	  its writable mount, and this feature is convenient for online backup.
-
-	  Some features including atime, extended attributes, and POSIX ACLs,
-	  are not supported yet.
-
-	  To compile this file system support as a module, choose M here: the
-	  module will be called nilfs2.  If unsure, say N.
+source "fs/nilfs2/Kconfig"
 
 endif # MISC_FILESYSTEMS
 
diff --git a/fs/nilfs2/Kconfig b/fs/nilfs2/Kconfig
new file mode 100644
index 000000000000..72da095d4009
--- /dev/null
+++ b/fs/nilfs2/Kconfig
@@ -0,0 +1,25 @@
+config NILFS2_FS
+	tristate "NILFS2 file system support (EXPERIMENTAL)"
+	depends on BLOCK && EXPERIMENTAL
+	select CRC32
+	help
+	  NILFS2 is a log-structured file system (LFS) supporting continuous
+	  snapshotting.  In addition to versioning capability of the entire
+	  file system, users can even restore files mistakenly overwritten or
+	  destroyed just a few seconds ago.  Since this file system can keep
+	  consistency like conventional LFS, it achieves quick recovery after
+	  system crashes.
+
+	  NILFS2 creates a number of checkpoints every few seconds or per
+	  synchronous write basis (unless there is no change).  Users can
+	  select significant versions among continuously created checkpoints,
+	  and can change them into snapshots which will be preserved for long
+	  periods until they are changed back to checkpoints.  Each
+	  snapshot is mountable as a read-only file system concurrently with
+	  its writable mount, and this feature is convenient for online backup.
+
+	  Some features including atime, extended attributes, and POSIX ACLs,
+	  are not supported yet.
+
+	  To compile this file system support as a module, choose M here: the
+	  module will be called nilfs2.  If unsure, say N.
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 8e2ec43b18f4..52c089f07bc3 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -50,6 +50,8 @@
 #include <linux/writeback.h>
 #include <linux/kobject.h>
 #include <linux/exportfs.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
 #include "nilfs.h"
 #include "mdt.h"
 #include "alloc.h"
@@ -311,9 +313,6 @@ static void nilfs_put_super(struct super_block *sb)
 
 	lock_kernel();
 
-	if (sb->s_dirt)
-		nilfs_write_super(sb);
-
 	nilfs_detach_segment_constructor(sbi);
 
 	if (!(sb->s_flags & MS_RDONLY)) {
@@ -527,6 +526,26 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	return 0;
 }
 
+static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+	struct super_block *sb = vfs->mnt_sb;
+	struct nilfs_sb_info *sbi = NILFS_SB(sb);
+
+	if (!nilfs_test_opt(sbi, BARRIER))
+		seq_printf(seq, ",barrier=off");
+	if (nilfs_test_opt(sbi, SNAPSHOT))
+		seq_printf(seq, ",cp=%llu",
+			   (unsigned long long int)sbi->s_snapshot_cno);
+	if (nilfs_test_opt(sbi, ERRORS_RO))
+		seq_printf(seq, ",errors=remount-ro");
+	if (nilfs_test_opt(sbi, ERRORS_PANIC))
+		seq_printf(seq, ",errors=panic");
+	if (nilfs_test_opt(sbi, STRICT_ORDER))
+		seq_printf(seq, ",order=strict");
+
+	return 0;
+}
+
 static struct super_operations nilfs_sops = {
 	.alloc_inode    = nilfs_alloc_inode,
 	.destroy_inode  = nilfs_destroy_inode,
@@ -544,7 +563,7 @@ static struct super_operations nilfs_sops = {
 	.remount_fs     = nilfs_remount,
 	.clear_inode    = nilfs_clear_inode,
 	/* .umount_begin */
-	/* .show_options */
+	.show_options = nilfs_show_options
 };
 
 static struct inode *