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 <redacted>
Signed-off-by: Dmitry Monakhov <redacted>
Reviewed-by: Jan Kara <jack@suse.cz>
---
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 */

/* 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) ||

		(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