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Commit a258af7a authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: Add datacow mount option. 



Add datacow mount option to enable copy-on-write with
remount option.

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent bd0330ad

Documentation/filesystems/btrfs.txt

+3 −2
Original line number Diff line number Diff line
@@ -154,9 +154,10 @@ Options with (*) are default options and will not show in the mount options. 
	(non-battery-backed) write-back cache, nobarrier option will lead to

	filesystem corruption on a system crash or power loss.



  datacow(*)

  nodatacow

	Disable data copy-on-write for newly created files.  Implies nodatasum,

	and disables all compression.

	Enable/disable data copy-on-write for newly created files.

	Nodatacow implies nodatasum, and disables all compression.



  nodatasum

	Disable data checksumming for newly created files.

fs/btrfs/super.c

+7 −1
Original line number Diff line number Diff line
@@ -324,7 +324,7 @@ enum { 
	Opt_check_integrity, Opt_check_integrity_including_extent_data,

	Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,

	Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,

	Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl,

	Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,

	Opt_err,

};
@@ -335,6 +335,7 @@ static match_table_t tokens = { 
	{Opt_device, "device=%s"},

	{Opt_nodatasum, "nodatasum"},

	{Opt_nodatacow, "nodatacow"},

	{Opt_datacow, "datacow"},

	{Opt_nobarrier, "nobarrier"},

	{Opt_barrier, "barrier"},

	{Opt_max_inline, "max_inline=%s"},
@@ -446,6 +447,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
			btrfs_set_opt(info->mount_opt, NODATACOW);

			btrfs_set_opt(info->mount_opt, NODATASUM);

			break;

		case Opt_datacow:

			if (btrfs_test_opt(root, NODATACOW))

				btrfs_info(root->fs_info, "setting datacow");

			btrfs_clear_opt(info->mount_opt, NODATACOW);

			break;

		case Opt_compress_force:

		case Opt_compress_force_type:

			compress_force = true;