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Btrfs: Add flush barriers on commit 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-01-09 09:23:21 -05:00
parent bcd987feef
commit 21ad10cf3e
3 changed files with 16 additions and 3 deletions
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5
fs/btrfs/ctree.h
View File

@ -440,8 +440,9 @@ struct btrfs_root {
*/
#define BTRFS_STRING_ITEM_KEY 253
#define BTRFS_MOUNT_NODATASUM 0x1
#define BTRFS_MOUNT_NODATACOW 0x2
#define BTRFS_MOUNT_NODATASUM (1 << 0)
#define BTRFS_MOUNT_NODATACOW (1 << 1)
#define BTRFS_MOUNT_NOBARRIER (1 << 2)
#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)

5
fs/btrfs/disk-io.c
View File

@ -762,10 +762,15 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
int ret;
struct extent_buffer *super = root->fs_info->sb_buffer;
struct inode *btree_inode = root->fs_info->btree_inode;
struct super_block *sb = root->fs_info->sb;
if (!btrfs_test_opt(root, NOBARRIER))
blkdev_issue_flush(sb->s_bdev, NULL);
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
super->start, super->len);
if (!btrfs_test_opt(root, NOBARRIER))
blkdev_issue_flush(sb->s_bdev, NULL);
return ret;
}

9
fs/btrfs/super.c
View File

@ -64,13 +64,14 @@ static void btrfs_put_super (struct super_block * sb)
enum {
Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
Opt_alloc_start, Opt_err,
Opt_alloc_start, Opt_nobarrier, Opt_err,
};
static match_table_t tokens = {
{Opt_subvol, "subvol=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_nodatacow, "nodatacow"},
{Opt_nobarrier, "nobarrier"},
{Opt_max_extent, "max_extent=%s"},
{Opt_alloc_start, "alloc_start=%s"},
{Opt_err, NULL}
@ -148,6 +149,12 @@ static int parse_options (char * options,
btrfs_set_opt(info->mount_opt, NODATASUM);
}
break;
case Opt_nobarrier:
if (info) {
printk("btrfs: turning off barriers\n");
btrfs_set_opt(info->mount_opt, NOBARRIER);
}
break;
case Opt_max_extent:
if (info) {
char *num = match_strdup(&args[0]);