[PATCH 01/13] block: implement and use {disk|part}_to_dev()

From: Tejun Heo
Date: Mon Jul 14 2008 - 03:52:40 EST

Implement and use {disk|part}_to_dev() and use them to access generic
device instead of directly dereferencing {disk|part}->dev. To make
sure no user is left behind, rename generic devices fields to __dev.

This is in preparation of unifying partition 0 handling with other
partitions.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
block/blk-sysfs.c | 4 +-
block/genhd.c | 32 +++++++++---------
drivers/block/aoe/aoeblk.c | 4 +-
drivers/block/nbd.c | 4 +-
drivers/ide/ide-probe.c | 2 +-
drivers/md/dm.c | 4 +-
drivers/md/md.c | 10 +++---
fs/block_dev.c | 4 +-
fs/partitions/check.c | 75 +++++++++++++++++++++++---------------------
include/linux/genhd.h | 20 ++++++-----
10 files changed, 82 insertions(+), 77 deletions(-)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 304ec73..b9a6ed1 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -310,7 +310,7 @@ int blk_register_queue(struct gendisk *disk)
if (!q->request_fn)
return 0;

- ret = kobject_add(&q->kobj, kobject_get(&disk->dev.kobj),
+ ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj),
"%s", "queue");
if (ret < 0)
return ret;
@@ -339,6 +339,6 @@ void blk_unregister_queue(struct gendisk *disk)

kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
- kobject_put(&disk->dev.kobj);
+ kobject_put(&disk_to_dev(disk)->kobj);
}
}
diff --git a/block/genhd.c b/block/genhd.c
index e2deec2..c54f694 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -59,7 +59,7 @@ struct hd_struct *disk_get_part(struct gendisk *disk, int partno)
rcu_read_lock();
part = rcu_dereference(disk->__part[partno - 1]);
if (part)
- get_device(&part->dev);
+ get_device(part_to_dev(part));
rcu_read_unlock();

return part;
@@ -130,7 +130,7 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects)
continue;

- get_device(&part->dev);
+ get_device(part_to_dev(part));
piter->part = part;
piter->idx++;
break;
@@ -434,7 +434,7 @@ static struct kobject *exact_match(dev_t devt, int *partno, void *data)
{
struct gendisk *p = data;

- return &p->dev.kobj;
+ return &disk_to_dev(p)->kobj;
}

static int exact_lock(dev_t devt, void *data)
@@ -458,7 +458,7 @@ void add_disk(struct gendisk *disk)
struct backing_dev_info *bdi;

disk->flags |= GENHD_FL_UP;
- disk->dev.devt = MKDEV(disk->major, disk->first_minor);
+ disk_to_dev(disk)->devt = MKDEV(disk->major, disk->first_minor);
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
register_disk(disk);
@@ -466,7 +466,7 @@ void add_disk(struct gendisk *disk)

bdi = &disk->queue->backing_dev_info;
bdi_register_dev(bdi, disk_devt(disk));
- sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi");
+ sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi");
}

EXPORT_SYMBOL(add_disk);
@@ -474,7 +474,7 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */

void unlink_gendisk(struct gendisk *disk)
{
- sysfs_remove_link(&disk->dev.kobj, "bdi");
+ sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
bdi_unregister(&disk->queue->backing_dev_info);
blk_unregister_queue(disk);
blk_unregister_region(disk_devt(disk), disk->minors);
@@ -623,7 +623,7 @@ static void *part_next(struct seq_file *seqf, void *v, loff_t *pos)
struct gendisk *gp = v;
struct device *dev;
++*pos;
- list_for_each_entry(dev, &gp->dev.node, node) {
+ list_for_each_entry(dev, &disk_to_dev(gp)->node, node) {
if (&dev->node == &block_class.devices)
return NULL;
if (dev->type == &disk_type)
@@ -644,7 +644,7 @@ static int show_partition(struct seq_file *seqf, void *v)
struct hd_struct *part;
char buf[BDEVNAME_SIZE];

- if (&sgp->dev.node == block_class.devices.next)
+ if (&disk_to_dev(sgp)->node == block_class.devices.next)
seq_puts(seqf, "major minor #blocks name\n\n");

/* Don't show non-partitionable removeable devices or empty devices */
@@ -881,7 +881,7 @@ static void *diskstats_next(struct seq_file *seqf, void *v, loff_t *pos)
struct device *dev;

++*pos;
- list_for_each_entry(dev, &gp->dev.node, node) {
+ list_for_each_entry(dev, &disk_to_dev(gp)->node, node) {
if (&dev->node == &block_class.devices)
return NULL;
if (dev->type == &disk_type)
@@ -903,7 +903,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
char buf[BDEVNAME_SIZE];

/*
- if (&gp->dev.kobj.entry == block_class.devices.next)
+ if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next)
seq_puts(seqf, "major minor name"
" rio rmerge rsect ruse wio wmerge "
"wsect wuse running use aveq"
@@ -971,7 +971,7 @@ static void media_change_notify_thread(struct work_struct *work)
* set enviroment vars to indicate which event this is for
* so that user space will know to go check the media status.
*/
- kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp);
+ kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp);
put_device(gd->driverfs_dev);
}

@@ -1063,9 +1063,9 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id)
disk->minors = minors;
disk->ext_minors = ext_minors;
rand_initialize_disk(disk);
- disk->dev.class = &block_class;
- disk->dev.type = &disk_type;
- device_initialize(&disk->dev);
+ disk_to_dev(disk)->class = &block_class;
+ disk_to_dev(disk)->type = &disk_type;
+ device_initialize(disk_to_dev(disk));
INIT_WORK(&disk->async_notify,
media_change_notify_thread);
}
@@ -1087,7 +1087,7 @@ struct kobject *get_disk(struct gendisk *disk)
owner = disk->fops->owner;
if (owner && !try_module_get(owner))
return NULL;
- kobj = kobject_get(&disk->dev.kobj);
+ kobj = kobject_get(&disk_to_dev(disk)->kobj);
if (kobj == NULL) {
module_put(owner);
return NULL;
@@ -1101,7 +1101,7 @@ EXPORT_SYMBOL(get_disk);
void put_disk(struct gendisk *disk)
{
if (disk)
- kobject_put(&disk->dev.kobj);
+ kobject_put(&disk_to_dev(disk)->kobj);
}

EXPORT_SYMBOL(put_disk);
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 0c39782..3edb6cb 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -109,12 +109,12 @@ static const struct attribute_group attr_group = {
static int
aoedisk_add_sysfs(struct aoedev *d)
{
- return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
+ return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
- sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
+ sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}

static int
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index ad98dda..00337c8 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -403,7 +403,7 @@ static int nbd_do_it(struct nbd_device *lo)
BUG_ON(lo->magic != LO_MAGIC);

lo->pid = current->pid;
- ret = sysfs_create_file(&lo->disk->dev.kobj, &pid_attr.attr);
+ ret = sysfs_create_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
if (ret) {
printk(KERN_ERR "nbd: sysfs_create_file failed!");
return ret;
@@ -412,7 +412,7 @@ static int nbd_do_it(struct nbd_device *lo)
while ((req = nbd_read_stat(lo)) != NULL)
nbd_end_request(req);

- sysfs_remove_file(&lo->disk->dev.kobj, &pid_attr.attr);
+ sysfs_remove_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
return 0;
}

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 26e68b6..2e020de 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1133,7 +1133,7 @@ static struct kobject *exact_match(dev_t dev, int *part, void *data)
{
struct gendisk *p = data;
*part &= (1 << PARTN_BITS) - 1;
- return &p->dev.kobj;
+ return &disk_to_dev(p)->kobj;
}

static int exact_lock(dev_t dev, void *data)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f76fb06..47d92be 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1136,7 +1136,7 @@ static void event_callback(void *context)
list_splice_init(&md->uevent_list, &uevents);
spin_unlock_irqrestore(&md->uevent_lock, flags);

- dm_send_uevents(&uevents, &md->disk->dev.kobj);
+ dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);

atomic_inc(&md->event_nr);
wake_up(&md->eventq);
@@ -1593,7 +1593,7 @@ out:
*---------------------------------------------------------------*/
void dm_kobject_uevent(struct mapped_device *md)
{
- kobject_uevent(&md->disk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE);
}

uint32_t dm_next_uevent_seq(struct mapped_device *md)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2580ac1..4d6ef34 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1416,9 +1416,9 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
goto fail;

if (rdev->bdev->bd_part)
- ko = &rdev->bdev->bd_part->dev.kobj;
+ ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
else
- ko = &rdev->bdev->bd_disk->dev.kobj;
+ ko = &disk_to_dev(rdev->bdev->bd_disk)->kobj;
if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
kobject_del(&rdev->kobj);
goto fail;
@@ -3327,8 +3327,8 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
add_disk(disk);
mddev->gendisk = disk;
mutex_unlock(&disks_mutex);
- error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
- "%s", "md");
+ error = kobject_init_and_add(&mddev->kobj, &md_ktype,
+ &disk_to_dev(disk)->kobj, "%s", "md");
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);
@@ -3608,7 +3608,7 @@ static int do_md_run(mddev_t * mddev)

mddev->changed = 1;
md_new_event(mddev);
- kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
return 0;
}

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 5d38203..5f177bd 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -543,9 +543,9 @@ EXPORT_SYMBOL(bd_release);
static struct kobject *bdev_get_kobj(struct block_device *bdev)
{
if (bdev->bd_contains != bdev)
- return kobject_get(&bdev->bd_part->dev.kobj);
+ return kobject_get(&part_to_dev(bdev->bd_part)->kobj);
else
- return kobject_get(&bdev->bd_disk->dev.kobj);
+ return kobject_get(&disk_to_dev(bdev->bd_disk)->kobj);
}

static struct kobject *bdev_get_holder(struct block_device *bdev)
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 78be967..d12ac7d 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -308,7 +308,7 @@ static inline void partition_sysfs_add_subdir(struct hd_struct *p)
{
struct kobject *k;

- k = kobject_get(&p->dev.kobj);
+ k = kobject_get(&part_to_dev(p)->kobj);
p->holder_dir = kobject_create_and_add("holders", k);
kobject_put(k);
}
@@ -317,7 +317,7 @@ static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
{
struct kobject *k;

- k = kobject_get(&disk->dev.kobj);
+ k = kobject_get(&disk_to_dev(disk)->kobj);
disk->holder_dir = kobject_create_and_add("holders", k);
disk->slave_dir = kobject_create_and_add("slaves", k);
kobject_put(k);
@@ -330,7 +330,7 @@ static void delete_partition_rcu_cb(struct rcu_head *head)
part->start_sect = 0;
part->nr_sects = 0;
part_stat_set_all(part, 0);
- put_device(&part->dev);
+ put_device(part_to_dev(part));
}


@@ -345,7 +345,7 @@ void delete_partition(struct gendisk *disk, int partno)
blk_free_devt(part_devt(part));
rcu_assign_pointer(disk->__part[partno-1], NULL);
kobject_put(part->holder_dir);
- device_del(&part->dev);
+ device_del(part_to_dev(part));

call_rcu(&part->rcu_head, delete_partition_rcu_cb);
}
@@ -363,6 +363,9 @@ int add_partition(struct gendisk *disk, int partno,
{
struct hd_struct *p = NULL;
dev_t devt = MKDEV(0, 0);
+ struct device *ddev = disk_to_dev(disk);
+ struct device *pdev;
+ const char *dname;
int err;

if (disk->__part[partno - 1]) {
@@ -376,49 +379,48 @@ int add_partition(struct gendisk *disk, int partno,
goto fail;
if (!init_part_stats(p))
goto fail;
+ pdev = part_to_dev(p);

p->start_sect = start;
p->nr_sects = len;
p->partno = partno;
p->policy = disk->policy;

- if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%sp%d", disk->dev.bus_id, partno);
+ dname = dev_name(ddev);
+ if (isdigit(dname[strlen(dname) - 1]))
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno);
else
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%s%d", disk->dev.bus_id, partno);
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno);

- device_initialize(&p->dev);
- p->dev.class = &block_class;
- p->dev.type = &part_type;
- p->dev.parent = &disk->dev;
+ device_initialize(pdev);
+ pdev->class = &block_class;
+ pdev->type = &part_type;
+ pdev->parent = ddev;

err = blk_alloc_devt(p, &devt);
if (err)
goto fail;
- p->dev.devt = devt;
+ pdev->devt = devt;

INIT_RCU_HEAD(&p->rcu_head);
rcu_assign_pointer(disk->__part[partno-1], p);

/* delay uevent until 'holders' subdir is created */
- p->dev.uevent_suppress = 1;
- err = device_add(&p->dev);
+ pdev->uevent_suppress = 1;
+ err = device_add(pdev);
if (err)
goto fail;

partition_sysfs_add_subdir(p);
- p->dev.uevent_suppress = 0;
+ pdev->uevent_suppress = 0;
if (flags & ADDPART_FLAG_WHOLEDISK) {
- err = device_create_file(&p->dev, &dev_attr_whole_disk);
- printk(" %s: failed to create sysfs attrs (%d)\n",
- dev_name(&p->dev), err);
+ err = device_create_file(pdev, &dev_attr_whole_disk);
+ printk(" %s: failed to create sysfs attrs (%d)\n", dname, err);
}

/* suppress uevent if the disk supresses it */
- if (!disk->dev.uevent_suppress)
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
+ if (!ddev->uevent_suppress)
+ kobject_uevent(&pdev->kobj, KOBJ_ADD);

return 0;

@@ -433,30 +435,31 @@ int add_partition(struct gendisk *disk, int partno,
/* Not exported, helper to add_disk(). */
void register_disk(struct gendisk *disk)
{
+ struct device *ddev = disk_to_dev(disk);
struct block_device *bdev;
struct disk_part_iter piter;
struct hd_struct *part;
char *s;
int err;

- disk->dev.parent = disk->driverfs_dev;
+ ddev->parent = disk->driverfs_dev;

- strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN);
+ strlcpy(ddev->bus_id, disk->disk_name, KOBJ_NAME_LEN);
/* ewww... some of these buggers have / in the name... */
- s = strchr(disk->dev.bus_id, '/');
+ s = strchr(ddev->bus_id, '/');
if (s)
*s = '!';

/* delay uevents, until we scanned partition table */
- disk->dev.uevent_suppress = 1;
+ ddev->uevent_suppress = 1;

- if (device_add(&disk->dev))
+ if (device_add(ddev))
return;
#ifndef CONFIG_SYSFS_DEPRECATED
- err = sysfs_create_link(block_depr, &disk->dev.kobj,
- kobject_name(&disk->dev.kobj));
+ err = sysfs_create_link(block_depr, &ddev->kobj,
+ kobject_name(&ddev->kobj));
if (err) {
- device_del(&disk->dev);
+ device_del(ddev);
return;
}
#endif
@@ -482,13 +485,13 @@ void register_disk(struct gendisk *disk)

exit:
/* announce disk after possible partitions are created */
- disk->dev.uevent_suppress = 0;
- kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
+ ddev->uevent_suppress = 0;
+ kobject_uevent(&ddev->kobj, KOBJ_ADD);

/* announce possible partitions */
disk_part_iter_start(&piter, disk, 0);
while ((part = disk_part_iter_next(&piter)))
- kobject_uevent(&part->dev.kobj, KOBJ_ADD);
+ kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
disk_part_iter_stop(&piter);
}

@@ -519,7 +522,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
return -EIO;

/* tell userspace that the media / partition table may have changed */
- kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);

for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
@@ -589,7 +592,7 @@ void del_gendisk(struct gendisk *disk)
kobject_put(disk->slave_dir);
disk->driverfs_dev = NULL;
#ifndef CONFIG_SYSFS_DEPRECATED
- sysfs_remove_link(block_depr, disk->dev.bus_id);
+ sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
#endif
- device_del(&disk->dev);
+ device_del(disk_to_dev(disk));
}
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index cb6d9a7..96d7ac5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -15,9 +15,11 @@

#ifdef CONFIG_BLOCK

-#define kobj_to_dev(k) container_of(k, struct device, kobj)
-#define dev_to_disk(device) container_of(device, struct gendisk, dev)
-#define dev_to_part(device) container_of(device, struct hd_struct, dev)
+#define kobj_to_dev(k) container_of((k), struct device, kobj)
+#define dev_to_disk(device) container_of((device), struct gendisk, __dev)
+#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
+#define disk_to_dev(disk) (&((disk)->__dev))
+#define part_to_dev(part) (&((part)->__dev))

extern struct device_type part_type;
extern struct kobject *block_depr;
@@ -88,7 +90,7 @@ struct disk_stats {
struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
- struct device dev;
+ struct device __dev;
struct kobject *holder_dir;
int policy, partno;
#ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -140,7 +142,7 @@ struct gendisk {

int flags;
struct device *driverfs_dev; // FIXME: remove
- struct device dev;
+ struct device __dev;
struct kobject *holder_dir;
struct kobject *slave_dir;

@@ -161,7 +163,7 @@ struct gendisk {
static inline struct gendisk *part_to_disk(struct hd_struct *part)
{
if (likely(part))
- return dev_to_disk((part)->dev.parent);
+ return dev_to_disk(part_to_dev(part)->parent);
return NULL;
}

@@ -172,12 +174,12 @@ static inline int disk_max_parts(struct gendisk *disk)

static inline dev_t disk_devt(struct gendisk *disk)
{
- return disk->dev.devt;
+ return disk_to_dev(disk)->devt;
}

static inline dev_t part_devt(struct hd_struct *part)
{
- return part->dev.devt;
+ return part_to_dev(part)->devt;
}

extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
@@ -185,7 +187,7 @@ 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->dev);
+ put_device(part_to_dev(part));
}

/*
--
1.5.4.5

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