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btrfs: Add datasum mount option. 

Add datasum mount option to enable checksum with
remount option.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2014-01-06 09:58:32 +08:00 committed by Chris Mason
parent a258af7a3e
commit d399167d88
2 changed files with 13 additions and 1 deletions
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4
Documentation/filesystems/btrfs.txt
View File

@ -159,8 +159,10 @@ Options with (*) are default options and will not show in the mount options.
Enable/disable data copy-on-write for newly created files.
Nodatacow implies nodatasum, and disables all compression.
datasum(*)
nodatasum
Disable data checksumming for newly created files.
Enable/disable data checksumming for newly created files.
Datasum implies datacow.
notreelog
Disable the tree logging used for fsync and O_SYNC writes.

10
fs/btrfs/super.c
View File

@ -325,6 +325,7 @@ enum {
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_datacow,
Opt_datasum,
Opt_err,
};
@ -334,6 +335,7 @@ static match_table_t tokens = {
{Opt_subvolid, "subvolid=%s"},
{Opt_device, "device=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_datasum, "datasum"},
{Opt_nodatacow, "nodatacow"},
{Opt_datacow, "datacow"},
{Opt_nobarrier, "nobarrier"},
@ -434,6 +436,14 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_info(root->fs_info, "setting nodatasum");
btrfs_set_opt(info->mount_opt, NODATASUM);
break;
case Opt_datasum:
if (btrfs_test_opt(root, NODATACOW))
btrfs_info(root->fs_info, "setting datasum, datacow enabled");
else
btrfs_info(root->fs_info, "setting datasum");
btrfs_clear_opt(info->mount_opt, NODATACOW);
btrfs_clear_opt(info->mount_opt, NODATASUM);
break;
case Opt_nodatacow:
if (!btrfs_test_opt(root, COMPRESS) ||
!btrfs_test_opt(root, FORCE_COMPRESS)) {