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Btrfs: Add a clear_cache mount option

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If something goes wrong with the free space cache we need a way to make sure
it's not loaded on mount and that it's cleared for everybody.  When you pass the
clear_cache option it will make it so all block groups are setup to be cleared,
which keeps them from being loaded and then they will be truncated when the
transaction is committed.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
2010-09-21 14:21:34 -04:00
committed by Chris Mason
parent 67377734fd
commit 88c2ba3b06
4 changed files with 8 additions and 3 deletions
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6
fs/btrfs/super.c
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@@ -68,7 +68,7 @@ enum {
Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
Opt_discard, Opt_space_cache, Opt_err,
Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err,
};
static match_table_t tokens = {
@@ -93,6 +93,7 @@ static match_table_t tokens = {
{Opt_ratio, "metadata_ratio=%d"},
{Opt_discard, "discard"},
{Opt_space_cache, "space_cache"},
{Opt_clear_cache, "clear_cache"},
{Opt_err, NULL},
};
@@ -239,6 +240,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
case Opt_space_cache:
printk(KERN_INFO "btrfs: enabling disk space caching\n");
btrfs_set_opt(info->mount_opt, SPACE_CACHE);
case Opt_clear_cache:
printk(KERN_INFO "btrfs: force clearing of disk cache\n");
btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
break;
case Opt_err:
printk(KERN_INFO "btrfs: unrecognized mount option "