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nilfs2: add barrier mount option 

Nilfs enables write barriers by default and has "nobarrier" mount
option to disable this feature.  But it lacks the complementary option
and has no way to re-enable the feature on remount.

This adds "barrier" option to resolve this imbalance.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-05 13:00:08 +09:00
parent 325020477a
commit 773bc4f3b6
2 changed files with 9 additions and 2 deletions
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5
Documentation/filesystems/nilfs2.txt
View File

@ -49,7 +49,10 @@ Mount options
NILFS2 supports the following mount options:
(*) == default
nobarrier Disables barriers.
barrier(*) This enables/disables the use of write barriers. This
nobarrier requires an IO stack which can support barriers, and
if nilfs gets an error on a barrier write, it will
disable again with a warning.
errors=continue Keep going on a filesystem error.
errors=remount-ro(*) Remount the filesystem read-only on an error.
errors=panic Panic and halt the machine if an error occurs.

6
fs/nilfs2/super.c
View File

@ -603,7 +603,7 @@ static const struct export_operations nilfs_export_ops = {
enum {
Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Opt_discard, Opt_err,
};
@ -611,6 +611,7 @@ static match_table_t tokens = {
{Opt_err_cont, "errors=continue"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
{Opt_barrier, "barrier"},
{Opt_nobarrier, "nobarrier"},
{Opt_snapshot, "cp=%u"},
{Opt_order, "order=%s"},
@ -636,6 +637,9 @@ static int parse_options(char *options, struct super_block *sb)
token = match_token(p, tokens, args);
switch (token) {
case Opt_barrier:
nilfs_set_opt(sbi, BARRIER);
break;
case Opt_nobarrier:
nilfs_clear_opt(sbi, BARRIER);
break;