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btrfs: Add noflushoncommit mount option.

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Add noflushoncommit mount option to disable flush on commit 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 09:58:29 +08:00 committed by Chris Mason
parent 5303629343
commit 2c9ee85671
2 changed files with 8 additions and 1 deletions
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1
Documentation/filesystems/btrfs.txt
View file

@ -117,6 +117,7 @@ Options with (*) are default options and will not show in the mount options.
"bug" - BUG() on a fatal error. This is the default.
"panic" - panic() on a fatal error.
noflushoncommit(*)
flushoncommit
The 'flushoncommit' mount option forces any data dirtied by a write in a
prior transaction to commit as part of the current commit. This makes

8
fs/btrfs/super.c
View file

@ -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_noenospc_debug, Opt_noflushoncommit,
Opt_err,
};
@ -350,6 +350,7 @@ static match_table_t tokens = {
{Opt_noacl, "noacl"},
{Opt_notreelog, "notreelog"},
{Opt_flushoncommit, "flushoncommit"},
{Opt_noflushoncommit, "noflushoncommit"},
{Opt_ratio, "metadata_ratio=%d"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
@ -562,6 +563,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_info(root->fs_info, "turning on flush-on-commit");
btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
break;
case Opt_noflushoncommit:
if (btrfs_test_opt(root, FLUSHONCOMMIT))
btrfs_info(root->fs_info, "turning off flush-on-commit");
btrfs_clear_opt(info->mount_opt, FLUSHONCOMMIT);
break;
case Opt_ratio:
ret = match_int(&args[0], &intarg);
if (ret) {