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Date: Wed, 03 Feb 2010 15:13:30 -0600
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH] handle optional-arg mount options better
We have 2 mount options, "barrier" and "auto_da_alloc"
which may or may not take a 1/0 argument. This is confusing
the parser, it seems, because if we pass it without an
arg, it still tries to match_int for the arg, which
is uninitialized, and match_number uses those uninit from/to
values to do a kmalloc, resulting in potentially noisy
failures.
I think just defining _arg variants of the tokens and
handling them separately is the simplest fix.
Reported-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
(I'll send one for ext3 as well if this looks good on review)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index da184f4..f7d4f06 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1096,7 +1096,8 @@ enum {
Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
- Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
+ Opt_auto_da_alloc_arg, Opt_auto_da_alloc, Opt_noauto_da_alloc,
+ Opt_noload, Opt_nobh, Opt_bh,
Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
Opt_journal_update, Opt_journal_dev,
Opt_journal_checksum, Opt_journal_async_commit,
@@ -1104,8 +1105,8 @@ enum {
Opt_data_err_abort, Opt_data_err_ignore,
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
- Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
- Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
+ Opt_noquota, Opt_ignore, Opt_barrier_arg, Opt_barrier, Opt_nobarrier,
+ Opt_err, Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
Opt_stripe, Opt_delalloc, Opt_nodelalloc,
Opt_block_validity, Opt_noblock_validity,
Opt_inode_readahead_blks, Opt_journal_ioprio,
@@ -1161,7 +1162,7 @@ static const match_table_t tokens = {
{Opt_noquota, "noquota"},
{Opt_quota, "quota"},
{Opt_usrquota, "usrquota"},
- {Opt_barrier, "barrier=%u"},
+ {Opt_barrier_arg, "barrier=%u"},
{Opt_barrier, "barrier"},
{Opt_nobarrier, "nobarrier"},
{Opt_i_version, "i_version"},
@@ -1173,7 +1174,7 @@ static const match_table_t tokens = {
{Opt_noblock_validity, "noblock_validity"},
{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
{Opt_journal_ioprio, "journal_ioprio=%u"},
- {Opt_auto_da_alloc, "auto_da_alloc=%u"},
+ {Opt_auto_da_alloc_arg, "auto_da_alloc=%u"},
{Opt_auto_da_alloc, "auto_da_alloc"},
{Opt_noauto_da_alloc, "noauto_da_alloc"},
{Opt_discard, "discard"},
@@ -1514,10 +1515,7 @@ set_qf_format:
case Opt_abort:
sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
break;
- case Opt_nobarrier:
- clear_opt(sbi->s_mount_opt, BARRIER);
- break;
- case Opt_barrier:
+ case Opt_barrier_arg:
if (match_int(&args[0], &option)) {
set_opt(sbi->s_mount_opt, BARRIER);
break;
@@ -1527,6 +1525,12 @@ set_qf_format:
else
clear_opt(sbi->s_mount_opt, BARRIER);
break;
+ case Opt_nobarrier:
+ clear_opt(sbi->s_mount_opt, BARRIER);
+ break;
+ case Opt_barrier:
+ set_opt(sbi->s_mount_opt, BARRIER);
+ break;
case Opt_ignore:
break;
case Opt_resize:
@@ -1590,10 +1594,7 @@ set_qf_format:
*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
option);
break;
- case Opt_noauto_da_alloc:
- set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
- break;
- case Opt_auto_da_alloc:
+ case Opt_auto_da_alloc_arg:
if (match_int(&args[0], &option)) {
clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
break;
@@ -1603,6 +1604,12 @@ set_qf_format:
else
set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
break;
+ case Opt_noauto_da_alloc:
+ set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
+ break;
+ case Opt_auto_da_alloc:
+ clear_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
+ break;
case Opt_discard:
set_opt(sbi->s_mount_opt, DISCARD);
break;
--
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