diff options
| -rw-r--r-- | block/genhd.c | 1 | ||||
| -rw-r--r-- | block/ioctl.c | 2 | ||||
| -rw-r--r-- | fs/partitions/check.c | 23 | ||||
| -rw-r--r-- | fs/partitions/check.h | 3 | ||||
| -rw-r--r-- | include/linux/genhd.h | 53 |
5 files changed, 76 insertions, 6 deletions
diff --git a/block/genhd.c b/block/genhd.c index 59a2db6fece..c8da1205526 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 d8052f0dabd..2c15fe0912c 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 79fbf3f390f..6dfbee03ccc 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -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 @@ 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) @@ -675,8 +688,12 @@ 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 8e4e103ba21..d68bf4dc3bc 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 5f2f4c4d8fb..66e26b5a153 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); |