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authorEric Paris <eparis@redhat.com>2009-04-02 16:46:06 -0400
committerChris Mason <chris.mason@oracle.com>2009-04-02 16:46:06 -0400
commita9572a15a854bd40453a6b7b4dd9d29132f64c64 (patch)
tree36eb4ee3be45a4d622da2f103e571894a60c3c13 /fs/btrfs
parentfa9c0d795f7b57c76560b7fac703f5d341210e28 (diff)
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: Eric Paris <eparis@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/super.c34
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,