1 files changed, 33 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 19a4daf03ccb..2ceb40b794a8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -24,6 +24,7 @@
 #include <linux/highmem.h>
 #include <linux/time.h>
 #include <linux/init.h>
+#include <linux/seq_file.h>
 #include <linux/string.h>
 #include <linux/smp_lock.h>
 #include <linux/backing-dev.h>
@@ -385,6 +386,37 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
         return ret;
 }
 
+static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+        struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
+        struct btrfs_fs_info *info = root->fs_info;
+
+        if (btrfs_test_opt(root, DEGRADED))
+                seq_puts(seq, ",degraded");
+        if (btrfs_test_opt(root, NODATASUM))
+                seq_puts(seq, ",nodatasum");
+        if (btrfs_test_opt(root, NODATACOW))
+                seq_puts(seq, ",nodatacow");
+        if (btrfs_test_opt(root, NOBARRIER))
+                seq_puts(seq, ",nobarrier");
+        if (info->max_extent != (u64)-1)
+                seq_printf(seq, ",max_extent=%llu", info->max_extent);
+        if (info->max_inline != 8192 * 1024)
+                seq_printf(seq, ",max_inline=%llu", info->max_inline);
+        if (info->alloc_start != 0)
+                seq_printf(seq, ",alloc_start=%llu", info->alloc_start);
+        if (info->thread_pool_size !=  min_t(unsigned long,
+                                             num_online_cpus() + 2, 8))
+                seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
+        if (btrfs_test_opt(root, COMPRESS))
+                seq_puts(seq, ",compress");
+        if (btrfs_test_opt(root, SSD))
+                seq_puts(seq, ",ssd");
+        if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
+                seq_puts(seq, ",noacl");
+        return 0;
+}
+
 static void btrfs_write_super(struct super_block *sb)
 {
         sb->s_dirt = 0;
@@ -630,7 +662,7 @@ static struct super_operations btrfs_super_ops = {
         .put_super      = btrfs_put_super,
         .write_super    = btrfs_write_super,
         .sync_fs        = btrfs_sync_fs,
-        .show_options   = generic_show_options,
+        .show_options   = btrfs_show_options,
         .write_inode    = btrfs_write_inode,
         .dirty_inode    = btrfs_dirty_inode,
         .alloc_inode    = btrfs_alloc_inode,