Commit 49da9392 authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
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ext4: enable quota enforcement based on mount options 



When quota information is stored in quota files, we enable only quota
accounting on mount and enforcement is enabled only in response to
Q_QUOTAON quotactl. To make ext4 behavior consistent with XFS, we add a
possibility to enable quota enforcement on mount by specifying
corresponding quota mount option (usrquota, grpquota, prjquota).

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 93e3b4e6

fs/ext4/ext4.h

+9 −3
Original line number Diff line number Diff line
@@ -1117,9 +1117,15 @@ struct ext4_inode_info { 
#define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */

#define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */

#define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */

#define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */

#define EXT4_MOUNT_USRQUOTA		0x100000 /* "old" user quota */

#define EXT4_MOUNT_GRPQUOTA		0x200000 /* "old" group quota */

#define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */

#define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,

						 * enable enforcement for hidden

						 * quota files */

#define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable

						  * enforcement for hidden quota

						  * files */

#define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota

						  * enforcement */

#define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */

#define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */

#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */

fs/ext4/super.c

+24 −10
Original line number Diff line number Diff line
@@ -1267,7 +1267,7 @@ enum { 
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,

	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,

	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,

	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,

	Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,

	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,

	Opt_lazytime, Opt_nolazytime,

	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
@@ -1327,6 +1327,7 @@ static const match_table_t tokens = { 
	{Opt_noquota, "noquota"},

	{Opt_quota, "quota"},

	{Opt_usrquota, "usrquota"},

	{Opt_prjquota, "prjquota"},

	{Opt_barrier, "barrier=%u"},

	{Opt_barrier, "barrier"},

	{Opt_nobarrier, "nobarrier"},
@@ -1546,8 +1547,11 @@ static const struct mount_opts { 
							MOPT_SET | MOPT_Q},

	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,

							MOPT_SET | MOPT_Q},

	{Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,

							MOPT_SET | MOPT_Q},

	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |

		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},

		       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),

							MOPT_CLEAR | MOPT_Q},

	{Opt_usrjquota, 0, MOPT_Q},

	{Opt_grpjquota, 0, MOPT_Q},

	{Opt_offusrjquota, 0, MOPT_Q},
@@ -1836,13 +1840,17 @@ static int parse_options(char *options, struct super_block *sb, 
			return 0;

	}

#ifdef CONFIG_QUOTA

	if (ext4_has_feature_quota(sb) &&

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

		ext4_msg(sb, KERN_INFO, "Quota feature enabled, usrquota and grpquota "

			 "mount options ignored.");

		clear_opt(sb, USRQUOTA);

		clear_opt(sb, GRPQUOTA);

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

	/*

	 * We do the test below only for project quotas. 'usrquota' and

	 * 'grpquota' mount options are allowed even without quota feature

	 * to support legacy quotas in quota files.

	 */

	if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {

		ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "

			 "Cannot enable project quota enforcement.");

		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);
@@ -5250,12 +5258,18 @@ static int ext4_enable_quotas(struct super_block *sb) 
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),

		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)

	};

	bool quota_mopt[EXT4_MAXQUOTAS] = {

		test_opt(sb, USRQUOTA),

		test_opt(sb, GRPQUOTA),

		test_opt(sb, PRJQUOTA),

	};



	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;

	for (type = 0; type < EXT4_MAXQUOTAS; type++) {

		if (qf_inums[type]) {

			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,

						DQUOT_USAGE_ENABLED);

				DQUOT_USAGE_ENABLED |

				(quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));

			if (err) {

				ext4_warning(sb,

					"Failed to enable quota tracking "

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