[PATCH 14/14] quota: Support 64-bit quota format

[Jan Kara <jack@suse.cz>]

Implement conversion functions for new version (version 1) of quota
format which supports 64-bit block and inode limits and 64-bit inode
usage. The original implementation has been written by Andrew Perepechko.

Signed-off-by: Andrew Perepechko <andrew.perepechko@sun.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/quota_v2.c   |  140 ++++++++++++++++++++++++++++++++++++++++++++-----------
 fs/quotaio_v2.h |   26 ++++++++--
 2 files changed, 132 insertions(+), 34 deletions(-)

diff --git a/fs/quota_v2.c b/fs/quota_v2.c
index a371919..ac6668d 100644
--- a/fs/quota_v2.c
+++ b/fs/quota_v2.c
@@ -23,14 +23,24 @@ MODULE_LICENSE("GPL");
 
 #define __QUOTA_V2_PARANOIA
 
-static void v2_mem2diskdqb(void *dp, struct dquot *dquot);
-static void v2_disk2memdqb(struct dquot *dquot, void *dp);
-static int v2_is_id(void *dp, struct dquot *dquot);
-
-static struct qtree_fmt_operations v2_qtree_ops = {
-	.mem2disk_dqblk = v2_mem2diskdqb,
-	.disk2mem_dqblk = v2_disk2memdqb,
-	.is_id = v2_is_id,
+static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot);
+static void v2r0_disk2memdqb(struct dquot *dquot, void *dp);
+static int v2r0_is_id(void *dp, struct dquot *dquot);
+
+static struct qtree_fmt_operations v2r0_qtree_ops = {
+	.mem2disk_dqblk = v2r0_mem2diskdqb,
+	.disk2mem_dqblk = v2r0_disk2memdqb,
+	.is_id = v2r0_is_id,
+};
+
+static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot);
+static void v2r1_disk2memdqb(struct dquot *dquot, void *dp);
+static int v2r1_is_id(void *dp, struct dquot *dquot);
+
+static struct qtree_fmt_operations v2r1_qtree_ops = {
+	.mem2disk_dqblk = v2r1_mem2diskdqb,
+	.disk2mem_dqblk = v2r1_disk2memdqb,
+	.is_id = v2r1_is_id,
 };
 
 #define QUOTABLOCK_BITS 10
@@ -46,8 +56,7 @@ static inline qsize_t v2_qbtos(qsize_t blocks)
 	return blocks << QUOTABLOCK_BITS;
 }
 
-/* Check whether given file is really vfsv0 quotafile */
-static int v2_check_quota_file(struct super_block *sb, int type)
+static int v2_check_quota_file_header(struct super_block *sb, int type)
 {
 	struct v2_disk_dqheader dqhead;
 	ssize_t size;
@@ -58,12 +67,20 @@ static int v2_check_quota_file(struct super_block *sb, int type)
 	if (size != sizeof(struct v2_disk_dqheader)) {
 		printk("quota_v2: failed read expected=%zd got=%zd\n",
 			sizeof(struct v2_disk_dqheader), size);
-		return 0;
+		return -EIO;
 	}
-	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
-	    le32_to_cpu(dqhead.dqh_version) != quota_versions[type])
-		return 0;
-	return 1;
+	if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
+		return -ENOENT;
+	if (le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
+		return -EOPNOTSUPP;
+	return le32_to_cpu(dqhead.dqh_version);
+}
+
+
+/* Check whether given file is really vfsv0 quotafile */
+static int v2_check_quota_file(struct super_block *sb, int type)
+{
+	return v2_check_quota_file_header(sb, type) >= 0;
 }
 
 /* Read information header from quota file */
@@ -73,7 +90,13 @@ static int v2_read_file_info(struct super_block *sb, int type)
 	struct mem_dqinfo *info = sb_dqinfo(sb, type);
 	struct qtree_mem_dqinfo *qinfo;
 	ssize_t size;
+	int version = v2_check_quota_file_header(sb, type);
 
+	if (version < 0) {
+		printk(KERN_WARNING "Cannot identify quota file version on "
+		       "device %s: %d\n", sb->s_id, version);
+		return -1;
+	}
 	size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 	       sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
 	if (size != sizeof(struct v2_disk_dqinfo)) {
@@ -88,9 +111,14 @@ static int v2_read_file_info(struct super_block *sb, int type)
 		return -1;
 	}
 	qinfo = info->dqi_priv;
-	/* limits are stored as unsigned 32-bit data */
-	info->dqi_maxblimit = 0xffffffff;
-	info->dqi_maxilimit = 0xffffffff;
+	if (version == 0) {
+		/* limits are stored as unsigned 32-bit data */
+		info->dqi_maxblimit = 0xffffffff;
+		info->dqi_maxilimit = 0xffffffff;
+	} else {
+		info->dqi_maxblimit = 0x7fffffffffffffff;
+		info->dqi_maxilimit = 0x7fffffffffffffff;
+	}
 	info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 	info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 	info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
@@ -102,8 +130,13 @@ static int v2_read_file_info(struct super_block *sb, int type)
 	qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
 	qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
 	qinfo->dqi_qtree_depth = qtree_depth(qinfo);
-	qinfo->dqi_entry_size = sizeof(struct v2_disk_dqblk);
-	qinfo->dqi_ops = &v2_qtree_ops;
+	if (version == 0) {
+		qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
+		qinfo->dqi_ops = &v2r0_qtree_ops;
+	} else {
+		qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
+		qinfo->dqi_ops = &v2r1_qtree_ops;
+	}
 	return 0;
 }
 
@@ -134,9 +167,9 @@ static int v2_write_file_info(struct super_block *sb, int type)
 	return 0;
 }
 
-static void v2_disk2memdqb(struct dquot *dquot, void *dp)
+static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
 {
-	struct v2_disk_dqblk *d = dp, empty;
+	struct v2r0_disk_dqblk *d = dp, empty;
 	struct mem_dqblk *m = &dquot->dq_dqb;
 
 	m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
@@ -148,15 +181,15 @@ static void v2_disk2memdqb(struct dquot *dquot, void *dp)
 	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
 	m->dqb_btime = le64_to_cpu(d->dqb_btime);
 	/* We need to escape back all-zero structure */
-	memset(&empty, 0, sizeof(struct v2_disk_dqblk));
+	memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
 	empty.dqb_itime = cpu_to_le64(1);
-	if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk)))
+	if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
 		m->dqb_itime = 0;
 }
 
-static void v2_mem2diskdqb(void *dp, struct dquot *dquot)
+static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
 {
-	struct v2_disk_dqblk *d = dp;
+	struct v2r0_disk_dqblk *d = dp;
 	struct mem_dqblk *m = &dquot->dq_dqb;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
@@ -174,9 +207,60 @@ static void v2_mem2diskdqb(void *dp, struct dquot *dquot)
 		d->dqb_itime = cpu_to_le64(1);
 }
 
-static int v2_is_id(void *dp, struct dquot *dquot)
+static int v2r0_is_id(void *dp, struct dquot *dquot)
+{
+	struct v2r0_disk_dqblk *d = dp;
+	struct qtree_mem_dqinfo *info =
+			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+	if (qtree_entry_unused(info, dp))
+		return 0;
+	return le32_to_cpu(d->dqb_id) == dquot->dq_id;
+}
+
+static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
+{
+	struct v2r1_disk_dqblk *d = dp, empty;
+	struct mem_dqblk *m = &dquot->dq_dqb;
+
+	m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
+	m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
+	m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
+	m->dqb_itime = le64_to_cpu(d->dqb_itime);
+	m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
+	m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
+	m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
+	m->dqb_btime = le64_to_cpu(d->dqb_btime);
+	/* We need to escape back all-zero structure */
+	memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
+	empty.dqb_itime = cpu_to_le64(1);
+	if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
+		m->dqb_itime = 0;
+}
+
+static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
+{
+	struct v2r1_disk_dqblk *d = dp;
+	struct mem_dqblk *m = &dquot->dq_dqb;
+	struct qtree_mem_dqinfo *info =
+			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
+
+	d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
+	d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
+	d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
+	d->dqb_itime = cpu_to_le64(m->dqb_itime);
+	d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
+	d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
+	d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
+	d->dqb_btime = cpu_to_le64(m->dqb_btime);
+	d->dqb_id = cpu_to_le32(dquot->dq_id);
+	if (qtree_entry_unused(info, dp))
+		d->dqb_itime = cpu_to_le64(1);
+}
+
+static int v2r1_is_id(void *dp, struct dquot *dquot)
 {
-	struct v2_disk_dqblk *d = dp;
+	struct v2r1_disk_dqblk *d = dp;
 	struct qtree_mem_dqinfo *info =
 			sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 
diff --git a/fs/quotaio_v2.h b/fs/quotaio_v2.h
index 530fe58..42b916a 100644
--- a/fs/quotaio_v2.h
+++ b/fs/quotaio_v2.h
@@ -17,8 +17,8 @@
 }
 
 #define V2_INITQVERSIONS {\
-	0,		/* USRQUOTA */\
-	0		/* GRPQUOTA */\
+	1,		/* USRQUOTA */\
+	1		/* GRPQUOTA */\
 }
 
 /* First generic header */
@@ -28,11 +28,11 @@ struct v2_disk_dqheader {
 };
 
 /*
- * The following structure defines the format of the disk quota file
- * (as it appears on disk) - the file is a radix tree whose leaves point
- * to blocks of these structures.
+ * The following structure defines the format of the disk quota file in version
+ * 0 - the file is a radix tree whose leaves point to blocks of these
+ * structures.
  */
-struct v2_disk_dqblk {
+struct v2r0_disk_dqblk {
 	__le32 dqb_id;		/* id this quota applies to */
 	__le32 dqb_ihardlimit;	/* absolute limit on allocated inodes */
 	__le32 dqb_isoftlimit;	/* preferred inode limit */
@@ -44,6 +44,20 @@ struct v2_disk_dqblk {
 	__le64 dqb_itime;	/* time limit for excessive inode use */
 };
 
+/* The same structure in quota file version 1 */
+struct v2r1_disk_dqblk {
+	__le32 dqb_id;		/* id this quota applies to */
+	__le32 dqb_padding;	/* padding field */
+	__le64 dqb_ihardlimit;	/* absolute limit on allocated inodes */
+	__le64 dqb_isoftlimit;	/* preferred inode limit */
+	__le64 dqb_curinodes;	/* current # allocated inodes */
+	__le64 dqb_bhardlimit;	/* absolute limit on disk space */
+	__le64 dqb_bsoftlimit;	/* preferred limit on disk space */
+	__le64 dqb_curspace;	/* current space occupied (in bytes) */
+	__le64 dqb_btime;	/* time limit for excessive disk use */
+	__le64 dqb_itime;	/* time limit for excessive inode use */
+};
+
 /* Header with type and version specific information */
 struct v2_disk_dqinfo {
 	__le32 dqi_bgrace;	/* Time before block soft limit becomes hard limit */
-- 
1.5.6