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block: merge struct block_device and struct hd_struct

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Instead of having two structures that represent each block device with
different life time rules, merge them into a single one.  This also
greatly simplifies the reference counting rules, as we can use the inode
reference count as the main reference count for the new struct
block_device, with the device model reference front ending it for device
model interaction.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-27 16:43:51 +01:00 committed by Jens Axboe
parent 9499ffc752
commit 0d02129e76
10 changed files with 108 additions and 230 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
block/blk-cgroup.c
View File

@ -820,9 +820,9 @@ static void blkcg_fill_root_iostats(void)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
struct hd_struct *part = disk_get_part(disk, 0);
struct blkcg_gq *blkg = blk_queue_root_blkg(disk->queue);
struct block_device *bdev = dev_to_bdev(dev);
struct blkcg_gq *blkg =
blk_queue_root_blkg(bdev->bd_disk->queue);
struct blkg_iostat tmp;
int cpu;
@ -830,7 +830,7 @@ static void blkcg_fill_root_iostats(void)
for_each_possible_cpu(cpu) {
struct disk_stats *cpu_dkstats;
cpu_dkstats = per_cpu_ptr(part->bdev->bd_stats, cpu);
cpu_dkstats = per_cpu_ptr(bdev->bd_stats, cpu);
tmp.ios[BLKG_IOSTAT_READ] +=
cpu_dkstats->ios[STAT_READ];
tmp.ios[BLKG_IOSTAT_WRITE] +=

2
block/blk.h
View File

@ -356,7 +356,7 @@ char *disk_name(struct gendisk *hd, int partno, char *buf);
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
void delete_partition(struct hd_struct *part);
void delete_partition(struct block_device *part);
int bdev_add_partition(struct block_device *bdev, int partno,
sector_t start, sector_t length);
int bdev_del_partition(struct block_device *bdev, int partno);

90
block/genhd.c
View File

@ -106,13 +106,14 @@ const char *bdevname(struct block_device *bdev, char *buf)
}
EXPORT_SYMBOL(bdevname);
static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat)
static void part_stat_read_all(struct block_device *part,
struct disk_stats *stat)
{
int cpu;
memset(stat, 0, sizeof(struct disk_stats));
for_each_possible_cpu(cpu) {
struct disk_stats *ptr = per_cpu_ptr(part->bdev->bd_stats, cpu);
struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu);
int group;
for (group = 0; group < NR_STAT_GROUPS; group++) {
@ -167,39 +168,6 @@ struct block_device *__disk_get_part(struct gendisk *disk, int partno)
return rcu_dereference(ptbl->part[partno]);
}
/**
* disk_get_part - get partition
* @disk: disk to look partition from
* @partno: partition number
*
* Look for partition @partno from @disk. If found, increment
* reference count and return it.
*
* CONTEXT:
* Don't care.
*
* RETURNS:
* Pointer to the found partition on success, NULL if not found.
*/
struct hd_struct *disk_get_part(struct gendisk *disk, int partno)
{
struct block_device *bdev;
struct hd_struct *part;
rcu_read_lock();
bdev = __disk_get_part(disk, partno);
if (!bdev)
goto fail;
part = bdev->bd_part;
if (!kobject_get_unless_zero(&part_to_dev(part)->kobj))
goto fail;
rcu_read_unlock();
return part;
fail:
rcu_read_unlock();
return NULL;
}
/**
* disk_part_iter_init - initialize partition iterator
* @piter: iterator to initialize
@ -859,7 +827,7 @@ void del_gendisk(struct gendisk *disk)
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
while ((part = disk_part_iter_next(&piter))) {
invalidate_partition(part);
delete_partition(part->bd_part);
delete_partition(part);
}
disk_part_iter_exit(&piter);
@ -952,13 +920,13 @@ void blk_request_module(dev_t devt)
*/
struct block_device *bdget_disk(struct gendisk *disk, int partno)
{
struct hd_struct *part;
struct block_device *bdev = NULL;
part = disk_get_part(disk, partno);
if (part)
bdev = bdget_part(part);
disk_put_part(part);
rcu_read_lock();
bdev = __disk_get_part(disk, partno);
if (bdev && !bdgrab(bdev))
bdev = NULL;
rcu_read_unlock();
return bdev;
}
@ -1175,24 +1143,22 @@ static ssize_t disk_ro_show(struct device *dev,
ssize_t part_size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%llu\n", bdev_nr_sectors(p->bdev));
return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev)));
}
ssize_t part_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct request_queue *q = part_to_disk(p)->queue;
struct block_device *bdev = dev_to_bdev(dev);
struct request_queue *q = bdev->bd_disk->queue;
struct disk_stats stat;
unsigned int inflight;
part_stat_read_all(p, &stat);
part_stat_read_all(bdev, &stat);
if (queue_is_mq(q))
inflight = blk_mq_in_flight(q, p->bdev);
inflight = blk_mq_in_flight(q, bdev);
else
inflight = part_in_flight(p->bdev);
inflight = part_in_flight(bdev);
return sprintf(buf,
"%8lu %8lu %8llu %8u "
@ -1227,14 +1193,14 @@ ssize_t part_stat_show(struct device *dev,
ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct request_queue *q = part_to_disk(p)->queue;
struct block_device *bdev = dev_to_bdev(dev);
struct request_queue *q = bdev->bd_disk->queue;
unsigned int inflight[2];
if (queue_is_mq(q))
blk_mq_in_flight_rw(q, p->bdev, inflight);
blk_mq_in_flight_rw(q, bdev, inflight);
else
part_in_flight_rw(p->bdev, inflight);
part_in_flight_rw(bdev, inflight);
return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]);
}
@ -1282,20 +1248,17 @@ static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store);
ssize_t part_fail_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%d\n", p->bdev->bd_make_it_fail);
return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail);
}
ssize_t part_fail_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hd_struct *p = dev_to_part(dev);
int i;
if (count > 0 && sscanf(buf, "%d", &i) > 0)
p->bdev->bd_make_it_fail = i;
dev_to_bdev(dev)->bd_make_it_fail = i;
return count;
}
@ -1505,7 +1468,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0);
while ((hd = disk_part_iter_next(&piter))) {
part_stat_read_all(hd->bd_part, &stat);
part_stat_read_all(hd, &stat);
if (queue_is_mq(gp->queue))
inflight = blk_mq_in_flight(gp->queue, hd);
else
@ -1577,7 +1540,7 @@ dev_t blk_lookup_devt(const char *name, int partno)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
struct hd_struct *part;
struct block_device *part;
if (strcmp(dev_name(dev), name))
continue;
@ -1590,13 +1553,12 @@ dev_t blk_lookup_devt(const char *name, int partno)
MINOR(dev->devt) + partno);
break;
}
part = disk_get_part(disk, partno);
part = bdget_disk(disk, partno);
if (part) {
devt = part_devt(part);
disk_put_part(part);
devt = part->bd_dev;
bdput(part);
break;
}
disk_put_part(part);
}
class_dev_iter_exit(&iter);
return devt;

116
block/partitions/core.c
View File

@ -182,44 +182,39 @@ static struct parsed_partitions *check_partition(struct gendisk *hd,
static ssize_t part_partition_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%d\n", p->bdev->bd_partno);
return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno);
}
static ssize_t part_start_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%llu\n", p->bdev->bd_start_sect);
return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect);
}
static ssize_t part_ro_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%d\n", p->bdev->bd_read_only);
return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_read_only);
}
static ssize_t part_alignment_offset_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct block_device *bdev = dev_to_bdev(dev);
return sprintf(buf, "%u\n",
queue_limit_alignment_offset(&part_to_disk(p)->queue->limits,
p->bdev->bd_start_sect));
queue_limit_alignment_offset(&bdev->bd_disk->queue->limits,
bdev->bd_start_sect));
}
static ssize_t part_discard_alignment_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct block_device *bdev = dev_to_bdev(dev);
return sprintf(buf, "%u\n",
queue_limit_discard_alignment(&part_to_disk(p)->queue->limits,
p->bdev->bd_start_sect));
queue_limit_discard_alignment(&bdev->bd_disk->queue->limits,
bdev->bd_start_sect));
}
static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
@ -264,20 +259,17 @@ static const struct attribute_group *part_attr_groups[] = {
static void part_release(struct device *dev)
{
struct hd_struct *p = dev_to_part(dev);
blk_free_devt(dev->devt);
bdput(p->bdev);
bdput(dev_to_bdev(dev));
}
static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct hd_struct *part = dev_to_part(dev);
struct block_device *part = dev_to_bdev(dev);
add_uevent_var(env, "PARTN=%u", part->bdev->bd_partno);
if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0])
add_uevent_var(env, "PARTNAME=%s",
part->bdev->bd_meta_info->volname);
add_uevent_var(env, "PARTN=%u", part->bd_partno);
if (part->bd_meta_info && part->bd_meta_info->volname[0])
add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname);
return 0;
}
@ -292,25 +284,25 @@ struct device_type part_type = {
* Must be called either with bd_mutex held, before a disk can be opened or
* after all disk users are gone.
*/
void delete_partition(struct hd_struct *part)
void delete_partition(struct block_device *part)
{
struct gendisk *disk = part_to_disk(part);
struct gendisk *disk = part->bd_disk;
struct disk_part_tbl *ptbl =
rcu_dereference_protected(disk->part_tbl, 1);
rcu_assign_pointer(ptbl->part[part->bdev->bd_partno], NULL);
rcu_assign_pointer(ptbl->part[part->bd_partno], NULL);
rcu_assign_pointer(ptbl->last_lookup, NULL);
kobject_put(part->bdev->bd_holder_dir);
device_del(part_to_dev(part));
kobject_put(part->bd_holder_dir);
device_del(&part->bd_device);
/*
* Remove the block device from the inode hash, so that it cannot be
* looked up any more even when openers still hold references.
*/
remove_inode_hash(part->bdev->bd_inode);
remove_inode_hash(part->bd_inode);
put_device(part_to_dev(part));
put_device(&part->bd_device);
}
static ssize_t whole_disk_show(struct device *dev,
@ -324,11 +316,10 @@ static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
* Must be called either with bd_mutex held, before a disk can be opened or
* after all disk users are gone.
*/
static struct hd_struct *add_partition(struct gendisk *disk, int partno,
static struct block_device *add_partition(struct gendisk *disk, int partno,
sector_t start, sector_t len, int flags,
struct partition_meta_info *info)
{
struct hd_struct *p;
dev_t devt = MKDEV(0, 0);
struct device *ddev = disk_to_dev(disk);
struct device *pdev;
@ -367,9 +358,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
if (!bdev)
return ERR_PTR(-ENOMEM);
p = bdev->bd_part;
pdev = part_to_dev(p);
bdev->bd_start_sect = start;
bdev_set_nr_sectors(bdev, len);
bdev->bd_read_only = get_disk_ro(disk);
@ -381,6 +369,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
goto out_bdput;
}
pdev = &bdev->bd_device;
dname = dev_name(ddev);
if (isdigit(dname[strlen(dname) - 1]))
dev_set_name(pdev, "%sp%d", dname, partno);
@ -422,7 +411,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
/* suppress uevent if the disk suppresses it */
if (!dev_get_uevent_suppress(ddev))
kobject_uevent(&pdev->kobj, KOBJ_ADD);
return p;
return bdev;
out_bdput:
bdput(bdev);
@ -459,7 +448,7 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start,
int bdev_add_partition(struct block_device *bdev, int partno,
sector_t start, sector_t length)
{
struct hd_struct *part;
struct block_device *part;
mutex_lock(&bdev->bd_mutex);
if (partition_overlaps(bdev->bd_disk, start, length, -1)) {
@ -475,76 +464,59 @@ int bdev_add_partition(struct block_device *bdev, int partno,
int bdev_del_partition(struct block_device *bdev, int partno)
{
struct block_device *bdevp;
struct hd_struct *part = NULL;
struct block_device *part;
int ret;
bdevp = bdget_disk(bdev->bd_disk, partno);
if (!bdevp)
part = bdget_disk(bdev->bd_disk, partno);
if (!part)
return -ENXIO;
mutex_lock(&bdevp->bd_mutex);
mutex_lock(&part->bd_mutex);
mutex_lock_nested(&bdev->bd_mutex, 1);
ret = -ENXIO;
part = disk_get_part(bdev->bd_disk, partno);
if (!part)
goto out_unlock;
ret = -EBUSY;
if (bdevp->bd_openers)
if (part->bd_openers)
goto out_unlock;
sync_blockdev(bdevp);
invalidate_bdev(bdevp);
sync_blockdev(part);
invalidate_bdev(part);
delete_partition(part);
ret = 0;
out_unlock:
mutex_unlock(&bdev->bd_mutex);
mutex_unlock(&bdevp->bd_mutex);
bdput(bdevp);
if (part)
disk_put_part(part);
mutex_unlock(&part->bd_mutex);
bdput(part);
return ret;
}
int bdev_resize_partition(struct block_device *bdev, int partno,
sector_t start, sector_t length)
{
struct block_device *bdevp;
struct hd_struct *part;
struct block_device *part;
int ret = 0;
part = disk_get_part(bdev->bd_disk, partno);
part = bdget_disk(bdev->bd_disk, partno);
if (!part)
return -ENXIO;
ret = -ENOMEM;
bdevp = bdget_part(part);
if (!bdevp)
goto out_put_part;
mutex_lock(&bdevp->bd_mutex);
mutex_lock(&part->bd_mutex);
mutex_lock_nested(&bdev->bd_mutex, 1);
ret = -EINVAL;
if (start != part->bdev->bd_start_sect)
if (start != part->bd_start_sect)
goto out_unlock;
ret = -EBUSY;
if (partition_overlaps(bdev->bd_disk, start, length, partno))
goto out_unlock;
bdev_set_nr_sectors(bdevp, length);
bdev_set_nr_sectors(part, length);
ret = 0;
out_unlock:
mutex_unlock(&bdevp->bd_mutex);
mutex_unlock(&part->bd_mutex);
mutex_unlock(&bdev->bd_mutex);
bdput(bdevp);
out_put_part:
disk_put_part(part);
bdput(part);
return ret;
}
@ -577,7 +549,7 @@ int blk_drop_partitions(struct block_device *bdev)
disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
delete_partition(part->bd_part);
delete_partition(part);
disk_part_iter_exit(&piter);
return 0;
@ -592,7 +564,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
{
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;
struct hd_struct *part;
struct block_device *part;
if (!size)
return true;
@ -632,7 +604,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
if (IS_BUILTIN(CONFIG_BLK_DEV_MD) &&
(state->parts[p].flags & ADDPART_FLAG_RAID))
md_autodetect_dev(part_to_dev(part)->devt);
md_autodetect_dev(part->bd_dev);
return true;
}

9
fs/block_dev.c
View File

@ -39,7 +39,6 @@
struct bdev_inode {
struct block_device bdev;
struct hd_struct hd;
struct inode vfs_inode;
};
@ -887,9 +886,6 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
iput(inode);
return NULL;
}
bdev->bd_part = &BDEV_I(inode)->hd;
memset(bdev->bd_part, 0, sizeof(*bdev->bd_part));
bdev->bd_part->bdev = bdev;
return bdev;
}
@ -926,11 +922,6 @@ struct block_device *bdgrab(struct block_device *bdev)
}
EXPORT_SYMBOL(bdgrab);
struct block_device *bdget_part(struct hd_struct *part)
{
return bdget(part_devt(part));
}
long nr_blockdev_pages(void)
{
struct inode *inode;

8
include/linux/blk_types.h
View File

@ -8,6 +8,7 @@
#include <linux/types.h>
#include <linux/bvec.h>
#include <linux/device.h>
#include <linux/ktime.h>
struct bio_set;
@ -30,6 +31,7 @@ struct block_device {
struct super_block * bd_super;
struct mutex bd_mutex; /* open/close mutex */
void * bd_claiming;
struct device bd_device;
void * bd_holder;
int bd_holders;
bool bd_write_holder;
@ -38,7 +40,6 @@ struct block_device {
#endif
struct kobject *bd_holder_dir;
u8 bd_partno;
struct hd_struct * bd_part;
/* number of times partitions within this device have been opened. */
unsigned bd_part_count;
@ -61,8 +62,11 @@ struct block_device {
#define bdev_whole(_bdev) \
((_bdev)->bd_disk->part0)
#define dev_to_bdev(device) \
container_of((device), struct block_device, bd_device)
#define bdev_kobj(_bdev) \
(&part_to_dev((_bdev)->bd_part)->kobj)
(&((_bdev)->bd_device.kobj))
/*
* Block error status values. See block/blk-core:blk_errors for the details.

1
include/linux/blkdev.h
View File

@ -1999,7 +1999,6 @@ void blkdev_put_no_open(struct block_device *bdev);
struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
void bdev_add(struct block_device *bdev, dev_t dev);
struct block_device *I_BDEV(struct inode *inode);
struct block_device *bdget_part(struct hd_struct *part);
struct block_device *bdgrab(struct block_device *bdev);
void bdput(struct block_device *);

40
include/linux/genhd.h
View File

@ -19,12 +19,6 @@
#include <linux/blk_types.h>
#include <asm/local.h>
#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
#define part_to_dev(part) (&((part)->__dev))
#define dev_to_disk(device) (dev_to_part(device)->bdev->bd_disk)
#define disk_to_dev(disk) (part_to_dev((disk)->part0->bd_part))
extern const struct device_type disk_type;
extern struct device_type part_type;
extern struct class block_class;
@ -51,11 +45,6 @@ struct partition_meta_info {
u8 volname[PARTITION_META_INFO_VOLNAMELTH];
};
struct hd_struct {
struct block_device *bdev;
struct device __dev;
};
/**
* DOC: genhd capability flags
*
@ -190,19 +179,21 @@ struct gendisk {
struct lockdep_map lockdep_map;
};
/*
* The gendisk is refcounted by the part0 block_device, and the bd_device
* therein is also used for device model presentation in sysfs.
*/
#define dev_to_disk(device) \
(dev_to_bdev(device)->bd_disk)
#define disk_to_dev(disk) \
(&((disk)->part0->bd_device))
#if IS_REACHABLE(CONFIG_CDROM)
#define disk_to_cdi(disk) ((disk)->cdi)
#else
#define disk_to_cdi(disk) NULL
#endif
static inline struct gendisk *part_to_disk(struct hd_struct *part)
{
if (unlikely(!part))
return NULL;
return part->bdev->bd_disk;
}
static inline int disk_max_parts(struct gendisk *disk)
{
if (disk->flags & GENHD_FL_EXT_DEVT)
@ -221,19 +212,6 @@ static inline dev_t disk_devt(struct gendisk *disk)
return MKDEV(disk->major, disk->first_minor);
}
static inline dev_t part_devt(struct hd_struct *part)
{
return part_to_dev(part)->devt;
}
extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
static inline void disk_put_part(struct hd_struct *part)
{
if (likely(part))
put_device(part_to_dev(part));
}
/*
* Smarter partition iterator without context limits.
*/

21
init/do_mounts.c
View File

@ -76,11 +76,11 @@ struct uuidcmp {
*/
static int match_dev_by_uuid(struct device *dev, const void *data)
{
struct block_device *bdev = dev_to_bdev(dev);
const struct uuidcmp *cmp = data;
struct hd_struct *part = dev_to_part(dev);
if (!part->bdev->bd_meta_info ||
strncasecmp(cmp->uuid, part->bdev->bd_meta_info->uuid, cmp->len))
if (!bdev->bd_meta_info ||
strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len))
return 0;
return 1;
}
@ -133,13 +133,13 @@ static dev_t devt_from_partuuid(const char *uuid_str)
* Attempt to find the requested partition by adding an offset
* to the partition number found by UUID.
*/
struct hd_struct *part;
struct block_device *part;
part = disk_get_part(dev_to_disk(dev),
dev_to_part(dev)->bdev->bd_partno + offset);
part = bdget_disk(dev_to_disk(dev),
dev_to_bdev(dev)->bd_partno + offset);
if (part) {
devt = part_devt(part);
put_device(part_to_dev(part));
devt = part->bd_dev;
bdput(part);
}
} else {
devt = dev->devt;
@ -166,11 +166,10 @@ clear_root_wait:
*/
static int match_dev_by_label(struct device *dev, const void *data)
{
struct block_device *bdev = dev_to_bdev(dev);
const char *label = data;
struct hd_struct *part = dev_to_part(dev);
if (!part->bdev->bd_meta_info ||
strcmp(label, part->bdev->bd_meta_info->volname))
if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname))
return 0;
return 1;
}

43
kernel/trace/blktrace.c
View File

@ -1810,30 +1810,15 @@ static ssize_t blk_trace_mask2str(char *buf, int mask)
return p - buf;
}
static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
{
if (bdev->bd_disk == NULL)
return NULL;
return bdev_get_queue(bdev);
}
static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct block_device *bdev = bdget_part(dev_to_part(dev));
struct request_queue *q;
struct block_device *bdev = dev_to_bdev(dev);
struct request_queue *q = bdev_get_queue(bdev);
struct blk_trace *bt;
ssize_t ret = -ENXIO;
if (bdev == NULL)
goto out;
q = blk_trace_get_queue(bdev);
if (q == NULL)
goto out_bdput;
mutex_lock(&q->debugfs_mutex);
bt = rcu_dereference_protected(q->blk_trace,
@ -1856,9 +1841,6 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
out_unlock_bdev:
mutex_unlock(&q->debugfs_mutex);
out_bdput:
bdput(bdev);
out:
return ret;
}
@ -1866,8 +1848,8 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct block_device *bdev;
struct request_queue *q;
struct block_device *bdev = dev_to_bdev(dev);
struct request_queue *q = bdev_get_queue(bdev);
struct blk_trace *bt;
u64 value;
ssize_t ret = -EINVAL;
@ -1883,17 +1865,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
goto out;
value = ret;
}
} else if (kstrtoull(buf, 0, &value))
goto out;
ret = -ENXIO;
bdev = bdget_part(dev_to_part(dev));
if (bdev == NULL)
goto out;
q = blk_trace_get_queue(bdev);
if (q == NULL)
goto out_bdput;
} else {
if (kstrtoull(buf, 0, &value))
goto out;
}
mutex_lock(&q->debugfs_mutex);
@ -1931,8 +1906,6 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
out_unlock_bdev:
mutex_unlock(&q->debugfs_mutex);
out_bdput:
bdput(bdev);
out:
return ret ? ret : count;
}