Commit a9572a15 authored by Eric Paris's avatar Eric Paris Committed by Chris Mason
Browse files

Btrfs: introduce btrfs_show_options

btrfs options can change at times other than mount, yet /proc/mounts shows the
options string used when the fs was mounted (an example would be when btrfs
determines that barriers aren't useful and turns them off.)  This patch
instead outputs the actual options in use by btrfs.
Signed-off-by: default avatarEric Paris <>
Signed-off-by: default avatarChris Mason <>
parent fa9c0d79
......@@ -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,
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