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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-07-05 14:27:04 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-07-23 10:02:12 +0900
commit802d31775404ee335ca1e97a82e1e706a4c843be (patch)
tree3753263ea97748e6c2b01f29fb7f81c19381eb7b /fs/nilfs2/super.c
parent773bc4f3b6898634a80a41c72a1f34cb89992dcd (diff)
nilfs2: add nodiscard mount option
Nilfs has "discard" mount option which issues discard/TRIM commands to underlying block device, but it lacks a complementary option and has no way to disable the feature through remount. This adds "nodiscard" option to resolve this imbalance. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/super.c')
-rw-r--r--fs/nilfs2/super.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 13b0e955c028..9da12211aac1 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -604,7 +604,7 @@ static const struct export_operations nilfs_export_ops = {
enum {
Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
- Opt_discard, Opt_err,
+ Opt_discard, Opt_nodiscard, Opt_err,
};
static match_table_t tokens = {
@@ -617,6 +617,7 @@ static match_table_t tokens = {
{Opt_order, "order=%s"},
{Opt_norecovery, "norecovery"},
{Opt_discard, "discard"},
+ {Opt_nodiscard, "nodiscard"},
{Opt_err, NULL}
};
@@ -676,6 +677,9 @@ static int parse_options(char *options, struct super_block *sb)
case Opt_discard:
nilfs_set_opt(sbi, DISCARD);
break;
+ case Opt_nodiscard:
+ nilfs_clear_opt(sbi, DISCARD);
+ break;
default:
printk(KERN_ERR
"NILFS: Unrecognized mount option \"%s\"\n", p);