Commit 262b4662 authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
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ext4: don't allow quota mount options when quota feature enabled 



So far we silently ignored when quota mount options were set while quota
feature was enabled.  But this can create confusion in userspace when
mount options are set but silently ignored and also creates opportunities
for bugs when we don't properly test all quota types.  Actually
ext4_mark_dquot_dirty() forgets to test for quota feature so it was
dependent on journaled quota options being set.  OTOH ext4_orphan_cleanup()
tries to enable journaled quota when quota options are specified which is
wrong when quota feature is enabled.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent d4e43954

fs/ext4/super.c

+26 −7
Original line number Diff line number Diff line
@@ -1248,6 +1248,11 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 
			"quota options when quota turned on");

		return -1;

	}

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {

		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "

			 "when QUOTA feature is enabled");

		return -1;

	}

	qname = match_strdup(args);

	if (!qname) {

		ext4_msg(sb, KERN_ERR,
@@ -1545,6 +1550,13 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, 
				 "quota options when quota turned on");

			return -1;

		}

		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,

					       EXT4_FEATURE_RO_COMPAT_QUOTA)) {

			ext4_msg(sb, KERN_ERR,

				 "Cannot set journaled quota options "

				 "when QUOTA feature is enabled");

			return -1;

		}

		sbi->s_jquota_fmt = m->mount_opt;

#endif

	} else {
@@ -1593,6 +1605,12 @@ static int parse_options(char *options, struct super_block *sb, 
			return 0;

	}

#ifdef CONFIG_QUOTA

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&

	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {

		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "

			 "feature is enabled");

		return 0;

	}

	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {

		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])

			clear_opt(sb, USRQUOTA);
@@ -3715,13 +3733,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) 
	sb->s_export_op = &ext4_export_ops;

	sb->s_xattr = ext4_xattr_handlers;

#ifdef CONFIG_QUOTA

	sb->s_qcop = &ext4_qctl_operations;

	sb->dq_op = &ext4_quota_operations;



	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {

		/* Use qctl operations for hidden quota files. */

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))

		sb->s_qcop = &ext4_qctl_sysfile_operations;

	}

	else

		sb->s_qcop = &ext4_qctl_operations;

#endif

	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
@@ -4822,9 +4838,12 @@ static int ext4_release_dquot(struct dquot *dquot) 


static int ext4_mark_dquot_dirty(struct dquot *dquot)

{

	struct super_block *sb = dquot->dq_sb;

	struct ext4_sb_info *sbi = EXT4_SB(sb);



	/* Are we journaling quotas? */

	if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||

	    EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||

	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {

		dquot_mark_dquot_dirty(dquot);

		return ext4_write_dquot(dquot);

	} else {

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