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From: Will Drewry on 3 Aug 2010 22:10
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(a)chromium.org>

v2: move assignment of p->info after copy
---
block/genhd.c | 1 +
block/ioctl.c | 2 +-
fs/partitions/check.c | 22 +++++++++++++++++++---
fs/partitions/check.h | 2 ++
include/linux/genhd.h | 32 ++++++++++++++++++++++++++++++--
5 files changed, 53 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..b616da8 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -196,6 +196,8 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
printk(" unknown partition table\n");
else if (warn_no_part)
printk(" unable to read partition table\n");
+ for (i = 0; i < DISK_MAX_PARTS; ++i)
+ kfree(state->parts[i].info);
kfree(state);
return ERR_PTR(res);
}
@@ -338,6 +340,7 @@ 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 +390,8 @@ 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 +428,14 @@ 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 +449,7 @@ 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 +480,8 @@ 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:
@@ -663,7 +677,9 @@ rescan:
}
}
part = add_partition(disk, p, from, size,
- state->parts[p].flags);
+ state->parts[p].flags,
+ state->parts[p].info);
+ kfree(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..8c724a7 100644
--- a/fs/partitions/check.h
+++ b/fs/partitions/check.h
@@ -1,6 +1,7 @@
#include <linux/pagemap.h>
#include <linux/blkdev.h>

+struct partition_meta_info;
/*
* add_gd_partition adds a partitions details to the devices partition
* description.
@@ -12,6 +13,7 @@ struct parsed_partitions {
sector_t from;
sector_t size;
int flags;
+ 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..7b6644a 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 +87,18 @@ struct disk_stats {
unsigned long io_ticks;
unsigned long time_in_queue;
};
-
+
+enum partition_meta_info_format_t {
+ /* Partition info format */
+ PARTITION_META_INFO_FORMAT_NONE = 0,
+};
+
+struct partition_meta_info {
+ enum partition_meta_info_format_t format;
+ union {
+ };
+};
+
struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
@@ -95,6 +107,7 @@ 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
@@ -342,6 +355,19 @@ 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 +559,9 @@ 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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