Re: [v10 3/5] ext4: adds project quota support

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On Mar 18, 2015, at 1:04 PM, Li Xi <pkuelelixi@xxxxxxxxx> wrote:
> 
> This patch adds mount options for enabling/disabling project quota
> accounting and enforcement. A new specific inode is also used for
> project quota accounting.
> 
> Signed-off-by: Li Xi <lixi@xxxxxxx>
> Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
> Reviewed-by: Jan Kara <jack@xxxxxxx>
> ---
> fs/ext4/ext4.h  |    9 +++++-
> fs/ext4/super.c |   76 ++++++++++++++++++++++++++++++++++++++++++++++++------
> 2 files changed, 74 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 7acb2da..ad650d4 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -208,6 +208,7 @@ struct ext4_io_submit {
> #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
> #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
> #define EXT4_JOURNAL_INO	 8	/* Journal inode */
> +#define EXT4_PRJ_QUOTA_INO	11	/* Project quota inode */

To me it doesn't make sense to reserve this inode number if we aren't
going to use it for project quota.  I think it is just confusing for
developers that incorrectly think this is correct instead of checking
s_prj_quota_inum.

> /* First non-reserved inode for old ext4 filesystems */
> #define EXT4_GOOD_OLD_FIRST_INO	11
> @@ -987,6 +988,7 @@ struct ext4_inode_info {
> #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 */
> +#define EXT4_MOUNT_PRJJQUOTA		0x2000000 /* Journaled Project quota */
> #define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */
> #define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */
> #define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */
> @@ -1169,7 +1171,8 @@ struct ext4_super_block {
> 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
> 	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */
> 	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
> -	__le32	s_reserved[105];	/* Padding to the end of the block */
> +	__le32  s_prj_quota_inum;       /* inode for tracking project quota */
> +	__le32	s_reserved[104];	/* Padding to the end of the block */
> 	__le32	s_checksum;		/* crc32c(superblock) */
> };
> 
> @@ -1184,7 +1187,7 @@ struct ext4_super_block {
> #define EXT4_MF_FS_ABORTED	0x0002	/* Fatal error detected */
> 
> /* Number of quota types we support */
> -#define EXT4_MAXQUOTAS 2
> +#define EXT4_MAXQUOTAS 3
> 
> /*
>  * fourth extended-fs super-block data in memory
> @@ -1376,6 +1379,8 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
> 		ino == EXT4_BOOT_LOADER_INO ||
> 		ino == EXT4_JOURNAL_INO ||
> 		ino == EXT4_RESIZE_INO ||
> +		(EXT4_FIRST_INO(sb) > EXT4_PRJ_QUOTA_INO &&
> +		 ino == EXT4_PRJ_QUOTA_INO) ||

This check isn't correct either, if s_prj_quota_inum != EXT4_PRJ_QUOTA_INO.

Cheers, Andreas

> 		(ino >= EXT4_FIRST_INO(sb) &&
> 		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
> }
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 04c6cc3..4077932 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1036,8 +1036,8 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
> }
> 
> #ifdef CONFIG_QUOTA
> -#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
> -#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
> +static char *quotatypes[] = INITQFNAMES;
> +#define QTYPE2NAME(t) (quotatypes[t])
> 
> static int ext4_write_dquot(struct dquot *dquot);
> static int ext4_acquire_dquot(struct dquot *dquot);
> @@ -1135,7 +1135,8 @@ enum {
> 	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
> 	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
> 	Opt_data_err_abort, Opt_data_err_ignore,
> -	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
> +	Opt_usrjquota, Opt_grpjquota, Opt_prjjquota,
> +	Opt_offusrjquota, Opt_offgrpjquota, Opt_offprjjquota,
> 	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,
> @@ -1190,6 +1191,8 @@ static const match_table_t tokens = {
> 	{Opt_usrjquota, "usrjquota=%s"},
> 	{Opt_offgrpjquota, "grpjquota="},
> 	{Opt_grpjquota, "grpjquota=%s"},
> +	{Opt_prjjquota, "prjjquota"},
> +	{Opt_offprjjquota, "offprjjquota"},
> 	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
> 	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
> 	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
> @@ -1412,11 +1415,16 @@ static const struct mount_opts {
> 	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
> 							MOPT_SET | MOPT_Q},
> 	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
> -		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
> +		       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJJQUOTA),
> +							MOPT_CLEAR | MOPT_Q},
> 	{Opt_usrjquota, 0, MOPT_Q},
> 	{Opt_grpjquota, 0, MOPT_Q},
> +	{Opt_prjjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJJQUOTA,
> +							MOPT_SET | MOPT_Q},
> 	{Opt_offusrjquota, 0, MOPT_Q},
> 	{Opt_offgrpjquota, 0, MOPT_Q},
> +	{Opt_offprjjquota, 0, EXT4_MOUNT_PRJJQUOTA,
> +							MOPT_CLEAR | MOPT_Q},
> 	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
> 	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
> 	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
> @@ -1673,7 +1681,9 @@ static int parse_options(char *options, struct super_block *sb,
> 			 "feature is enabled");
> 		return 0;
> 	}
> -	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
> +	if (sbi->s_qf_names[USRQUOTA] ||
> +	    sbi->s_qf_names[GRPQUOTA] ||
> +	    test_opt(sb, PRJJQUOTA)) {
> 		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
> 			clear_opt(sb, USRQUOTA);
> 
> @@ -3944,7 +3954,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> 		sb->s_qcop = &ext4_qctl_sysfile_operations;
> 	else
> 		sb->s_qcop = &ext4_qctl_operations;
> -	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
> +	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
> #endif
> 	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
> 
> @@ -5040,6 +5050,46 @@ restore_opts:
> 	return err;
> }
> 
> +static int ext4_statfs_project(struct super_block *sb,
> +			       kprojid_t projid, struct kstatfs *buf)
> +{
> +	struct kqid qid;
> +	struct dquot *dquot;
> +	u64 limit;
> +	u64 curblock;
> +
> +	qid = make_kqid_projid(projid);
> +	dquot = dqget(sb, qid);
> +	if (!dquot)
> +		return -ESRCH;
> +	spin_lock(&dq_data_lock);
> +
> +	limit = dquot->dq_dqb.dqb_bsoftlimit ?
> +		dquot->dq_dqb.dqb_bsoftlimit :
> +		dquot->dq_dqb.dqb_bhardlimit;
> +	if (limit && buf->f_blocks * buf->f_bsize > limit) {
> +		curblock = dquot->dq_dqb.dqb_curspace / buf->f_bsize;
> +		buf->f_blocks = limit / buf->f_bsize;
> +		buf->f_bfree = buf->f_bavail =
> +			(buf->f_blocks > curblock) ?
> +			 (buf->f_blocks - curblock) : 0;
> +	}
> +
> +	limit = dquot->dq_dqb.dqb_isoftlimit ?
> +		dquot->dq_dqb.dqb_isoftlimit :
> +		dquot->dq_dqb.dqb_ihardlimit;
> +	if (limit && buf->f_files > limit) {
> +		buf->f_files = limit;
> +		buf->f_ffree =
> +			(buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
> +			 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
> +	}
> +
> +	spin_unlock(&dq_data_lock);
> +	dqput(dquot);
> +	return 0;
> +}
> +
> static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> {
> 	struct super_block *sb = dentry->d_sb;
> @@ -5048,6 +5098,7 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> 	ext4_fsblk_t overhead = 0, resv_blocks;
> 	u64 fsid;
> 	s64 bfree;
> +	struct inode *inode = dentry->d_inode;
> 	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
> 
> 	if (!test_opt(sb, MINIX_DF))
> @@ -5072,6 +5123,9 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> 	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
> 	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
> 
> +	if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT) &&
> +	    sb_has_quota_limits_enabled(sb, PRJQUOTA))
> +		ext4_statfs_project(sb, EXT4_I(inode)->i_projid, buf);
> 	return 0;
> }
> 
> @@ -5152,7 +5206,9 @@ static int ext4_mark_dquot_dirty(struct dquot *dquot)
> 
> 	/* Are we journaling quotas? */
> 	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
> -	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
> +	    sbi->s_qf_names[USRQUOTA] ||
> +	    sbi->s_qf_names[GRPQUOTA] ||
> +	    test_opt(sb, PRJJQUOTA)) {
> 		dquot_mark_dquot_dirty(dquot);
> 		return ext4_write_dquot(dquot);
> 	} else {
> @@ -5236,7 +5292,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
> 	struct inode *qf_inode;
> 	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
> 		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
> -		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
> +		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
> +		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
> 	};
> 
> 	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
> @@ -5264,7 +5321,8 @@ static int ext4_enable_quotas(struct super_block *sb)
> 	int type, err = 0;
> 	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
> 		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
> -		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
> +		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
> +		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
> 	};
> 
> 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
> -- 
> 1.7.1
> 


Cheers, Andreas





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