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block, partition: add partition_meta_info to hd_struct 

I'm reposting this patch series as v4 since there have been no additional
comments, and I cleaned up one extra bit of unneeded code (in 3/3). The patches
are against Linus's tree: 2bfc96a127
(2.6.36-rc3).

Would this patchset be suitable for inclusion in an mm branch?

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@chromium.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Will Drewry 2010-08-31 15:47:05 -05:00 committed by Jens Axboe
parent 144177991c
commit 6d1d8050b4
5 changed files with 76 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/genhd.c
View File

@ -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 = {

2
block/ioctl.c
View File

@ -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:

23
fs/partitions/check.c
View File

@ -352,6 +352,7 @@ 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);
}
@ -401,7 +402,8 @@ 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);
@ -438,6 +440,14 @@ 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);
@ -451,7 +461,7 @@ 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 */
@ -481,6 +491,8 @@ 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:
@ -642,6 +654,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
/* 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)
@ -675,8 +688,12 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
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));

3
fs/partitions/check.h
View File

@ -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;

53
include/linux/genhd.h
View File

@ -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);