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Date: Wed, 4 Aug 2010 13:22:04 -0500
From: Will Drewry <wad@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kay Sievers <kay.sievers@...y.org>, Jens Axboe <axboe@...nel.dk>,
Karel Zak <kzak@...hat.com>, Tejun Heo <tj@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Joe Perches <joe@...ches.com>, Jan Blunck <jblunck@...e.de>,
Greg Kroah-Hartman <gregkh@...e.de>,
Will Drewry <wad@...omium.org>
Subject: [PATCH v3 1/3] block, partition: add partition_meta_info to hd_struct
This changes adds a partition_meta_info struct which itself contains a
union of structures that provide partition table specific metadata.
This change leaves the union empty. The subsequent patch includes an
implementation for CONFIG_EFI_PARTITION-based metadata.
Signed-off-by: Will Drewry <wad@...omium.org>
v2: move assignment of p->info after copy
v3: make partition_meta_info part of parsed_partitions (not a ptr)
get rid of extended partition-format specific information
(this could be easily be added to the struct at any point later)
add generic pack/unpack uuid helpers
---
block/genhd.c | 1 +
block/ioctl.c | 2 +-
fs/partitions/check.c | 23 ++++++++++++++++++--
fs/partitions/check.h | 3 ++
include/linux/genhd.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++-
5 files changed, 76 insertions(+), 6 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index 59a2db6..c8da120 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1004,6 +1004,7 @@ static void disk_release(struct device *dev)
kfree(disk->random);
disk_replace_part_tbl(disk, NULL);
free_part_stats(&disk->part0);
+ free_part_info(&disk->part0);
kfree(disk);
}
struct class block_class = {
diff --git a/block/ioctl.c b/block/ioctl.c
index e8eb679..f8e4bfe 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -62,7 +62,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
/* all seems OK */
part = add_partition(disk, partno, start, length,
- ADDPART_FLAG_NONE);
+ ADDPART_FLAG_NONE, NULL);
mutex_unlock(&bdev->bd_mutex);
return IS_ERR(part) ? PTR_ERR(part) : 0;
case BLKPG_DEL_PARTITION:
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 5dcd4b0..ec9c8b6 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -338,6 +338,7 @@ static void part_release(struct device *dev)
{
struct hd_struct *p = dev_to_part(dev);
free_part_stats(p);
+ free_part_info(p);
kfree(p);
}
@@ -387,7 +388,8 @@ static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
whole_disk_show, NULL);
struct hd_struct *add_partition(struct gendisk *disk, int partno,
- sector_t start, sector_t len, int flags)
+ sector_t start, sector_t len, int flags,
+ struct partition_meta_info *info)
{
struct hd_struct *p;
dev_t devt = MKDEV(0, 0);
@@ -424,6 +426,14 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
p->partno = partno;
p->policy = get_disk_ro(disk);
+ if (info) {
+ struct partition_meta_info *pinfo = alloc_part_info(disk);
+ if (!pinfo)
+ goto out_free_stats;
+ memcpy(pinfo, info, sizeof(*info));
+ p->info = pinfo;
+ }
+
dname = dev_name(ddev);
if (isdigit(dname[strlen(dname) - 1]))
dev_set_name(pdev, "%sp%d", dname, partno);
@@ -437,7 +447,7 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
err = blk_alloc_devt(p, &devt);
if (err)
- goto out_free_stats;
+ goto out_free_info;
pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
@@ -468,6 +478,8 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
return p;
+out_free_info:
+ free_part_info(p);
out_free_stats:
free_part_stats(p);
out_free:
@@ -629,6 +641,7 @@ rescan:
/* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size, from;
+ struct partition_meta_info *info = NULL;
size = state->parts[p].size;
if (!size)
@@ -662,8 +675,12 @@ rescan:
size = get_capacity(disk) - from;
}
}
+
+ if (state->parts[p].has_info)
+ info = &state->parts[p].info;
part = add_partition(disk, p, from, size,
- state->parts[p].flags);
+ state->parts[p].flags,
+ &state->parts[p].info);
if (IS_ERR(part)) {
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
disk->disk_name, p, -PTR_ERR(part));
diff --git a/fs/partitions/check.h b/fs/partitions/check.h
index 52f8bd3..ccf3371 100644
--- a/fs/partitions/check.h
+++ b/fs/partitions/check.h
@@ -1,5 +1,6 @@
#include <linux/pagemap.h>
#include <linux/blkdev.h>
+#include <linux/genhd.h>
/*
* add_gd_partition adds a partitions details to the devices partition
@@ -12,6 +13,8 @@ struct parsed_partitions {
sector_t from;
sector_t size;
int flags;
+ bool has_info;
+ struct partition_meta_info info;
} parts[DISK_MAX_PARTS];
int next;
int limit;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5f2f4c4..66e26b5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/rcupdate.h>
+#include <linux/slab.h>
#ifdef CONFIG_BLOCK
@@ -86,7 +87,15 @@ struct disk_stats {
unsigned long io_ticks;
unsigned long time_in_queue;
};
-
+
+#define PARTITION_META_INFO_VOLNAMELTH 64
+#define PARTITION_META_INFO_UUIDLTH 16
+
+struct partition_meta_info {
+ u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
+ u8 volname[PARTITION_META_INFO_VOLNAMELTH];
+};
+
struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
@@ -95,6 +104,7 @@ struct hd_struct {
struct device __dev;
struct kobject *holder_dir;
int policy, partno;
+ struct partition_meta_info *info;
#ifdef CONFIG_FAIL_MAKE_REQUEST
int make_it_fail;
#endif
@@ -181,6 +191,30 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part)
return NULL;
}
+static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
+{
+ int i;
+ for (i = 0; i < 16; ++i) {
+ *to++ = (hex_to_bin(*uuid_str) << 4) |
+ (hex_to_bin(*(uuid_str + 1)));
+ uuid_str += 2;
+ switch (i) {
+ case 3:
+ case 5:
+ case 7:
+ case 9:
+ uuid_str++;
+ continue;
+ }
+ }
+}
+
+static inline char *part_unpack_uuid(const u8 *uuid, char *out)
+{
+ sprintf(out, "%pU", uuid);
+ return out;
+}
+
static inline int disk_max_parts(struct gendisk *disk)
{
if (disk->flags & GENHD_FL_EXT_DEVT)
@@ -342,6 +376,19 @@ static inline int part_in_flight(struct hd_struct *part)
return part->in_flight[0] + part->in_flight[1];
}
+static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
+{
+ if (disk)
+ return kzalloc_node(sizeof(struct partition_meta_info),
+ GFP_KERNEL, disk->node_id);
+ return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
+}
+
+static inline void free_part_info(struct hd_struct *part)
+{
+ kfree(part->info);
+}
+
/* block/blk-core.c */
extern void part_round_stats(int cpu, struct hd_struct *part);
@@ -533,7 +580,9 @@ extern int disk_expand_part_tbl(struct gendisk *disk, int target);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
int partno, sector_t start,
- sector_t len, int flags);
+ sector_t len, int flags,
+ struct partition_meta_info
+ *info);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
--
1.7.0.4
--
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