| Message ID | 20211122130625.1136848-12-hch@lst.de |
|---|---|
| State | New |
| Headers | show |
| Series | [01/14] block: move GENHD_FL_NATIVE_CAPACITY to disk->state | expand |
Hi Christoph, On Mon, Nov 22, 2021 at 02:06:22PM +0100, Christoph Hellwig wrote: > All modern drivers can support extra partitions using the extended > dev_t. In fact except for the ioctl method drivers never even see > partitions in normal operation. > > So remove the GENHD_FL_EXT_DEVT and allow extra partitions for all > block devices that do support partitions, and require those that > do not support partitions to explicit disallow them using > GENHD_FL_NO_PART. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > block/genhd.c | 6 +++--- > block/partitions/core.c | 9 ++++----- > drivers/block/amiflop.c | 1 + > drivers/block/ataflop.c | 1 + > drivers/block/brd.c | 1 - > drivers/block/drbd/drbd_main.c | 1 + > drivers/block/floppy.c | 1 + > drivers/block/loop.c | 1 - > drivers/block/null_blk/main.c | 1 - > drivers/block/paride/pcd.c | 1 + > drivers/block/paride/pf.c | 1 + > drivers/block/pktcdvd.c | 2 +- > drivers/block/ps3vram.c | 1 + > drivers/block/rbd.c | 6 ++---- > drivers/block/swim.c | 1 + > drivers/block/swim3.c | 2 +- > drivers/block/virtio_blk.c | 1 - > drivers/block/z2ram.c | 1 + > drivers/block/zram/zram_drv.c | 1 + > drivers/cdrom/gdrom.c | 1 + > drivers/md/dm.c | 1 + > drivers/md/md.c | 5 ----- > drivers/mmc/core/block.c | 1 - > drivers/mtd/ubi/block.c | 1 + > drivers/scsi/sd.c | 1 - > drivers/scsi/sr.c | 1 + > include/linux/genhd.h | 28 +++++----------------------- > 27 files changed, 30 insertions(+), 48 deletions(-) > > diff --git a/block/genhd.c b/block/genhd.c > index 09abd41249fd4..e9346fae48ad4 100644 > --- a/block/genhd.c > +++ b/block/genhd.c > @@ -376,7 +376,7 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode) > { > struct block_device *bdev; > > - if (!disk_part_scan_enabled(disk)) > + if (disk->flags & GENHD_FL_NO_PART) > return -EINVAL; > if (disk->open_partitions) > return -EBUSY; > @@ -438,7 +438,6 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, > return ret; > disk->major = BLOCK_EXT_MAJOR; > disk->first_minor = ret; > - disk->flags |= GENHD_FL_EXT_DEVT; > } > > ret = disk_alloc_events(disk); > @@ -872,7 +871,8 @@ static ssize_t disk_ext_range_show(struct device *dev, > { > struct gendisk *disk = dev_to_disk(dev); > > - return sprintf(buf, "%d\n", disk_max_parts(disk)); > + return sprintf(buf, "%d\n", > + (disk->flags & GENHD_FL_NO_PART) ? 1 : DISK_MAX_PARTS); The above change breaks parted on loop, which reads 'ext_range' to add partitions. Follows the test case: fallocate -l 4096M loop0.img losetup /dev/loop0 loop0.img parted -s /dev/loop0 mklabel MSDOS parted -s /dev/loop0 mkpart pri 1 1248 Since this patch is merged, /dev/loop0p1 can't be created any more by above script. Thanks, Ming
On Wed, May 25, 2022 at 10:35:56PM +0800, Ming Lei wrote: > > @@ -872,7 +871,8 @@ static ssize_t disk_ext_range_show(struct device *dev, > > { > > struct gendisk *disk = dev_to_disk(dev); > > > > - return sprintf(buf, "%d\n", disk_max_parts(disk)); > > + return sprintf(buf, "%d\n", > > > The above change breaks parted on loop, which reads 'ext_range' to add > partitions. That change alone is not the one breaking it alone, as even if the file reported something else you still could not create new partitions. Something like the test below should fix it, but I'll need some more time to actually test it: diff --git a/block/genhd.c b/block/genhd.c index 36532b9318419..27205ae47d593 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -385,6 +385,8 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode) if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) return -EINVAL; + if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) + return -EINVAL; if (disk->open_partitions) return -EBUSY; diff --git a/drivers/block/loop.c b/drivers/block/loop.c index e2cb51810e89a..5bef97ffbe21e 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1102,7 +1102,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, lo->lo_flags |= LO_FLAGS_PARTSCAN; partscan = lo->lo_flags & LO_FLAGS_PARTSCAN; if (partscan) - lo->lo_disk->flags &= ~GENHD_FL_NO_PART; + clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); loop_global_unlock(lo, is_loop); if (partscan) @@ -1198,7 +1198,7 @@ static void __loop_clr_fd(struct loop_device *lo, bool release) */ lo->lo_flags = 0; if (!part_shift) - lo->lo_disk->flags |= GENHD_FL_NO_PART; + set_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); mutex_lock(&lo->lo_mutex); lo->lo_state = Lo_unbound; mutex_unlock(&lo->lo_mutex); @@ -1308,7 +1308,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) if (!err && (lo->lo_flags & LO_FLAGS_PARTSCAN) && !(prev_lo_flags & LO_FLAGS_PARTSCAN)) { - lo->lo_disk->flags &= ~GENHD_FL_NO_PART; + clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); partscan = true; } out_unlock: @@ -2011,7 +2011,7 @@ static int loop_add(int i) * userspace tools. Parameters like this in general should be avoided. */ if (!part_shift) - disk->flags |= GENHD_FL_NO_PART; + set_bit(GD_SUPPRESS_PART_SCAN, &disk->state); mutex_init(&lo->lo_mutex); lo->lo_number = i; spin_lock_init(&lo->lo_lock); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1b24c1fb3bb1e..bf0c85cfdd8bf 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -147,6 +147,7 @@ struct gendisk { #define GD_DEAD 2 #define GD_NATIVE_CAPACITY 3 #define GD_ADDED 4 +#define GD_SUPPRESS_PART_SCAN 4 struct mutex open_mutex; /* open/close mutex */ unsigned open_partitions; /* number of open partitions */
On Wed, May 25, 2022 at 06:51:14PM +0200, Christoph Hellwig wrote: > #define GD_ADDED 4 > +#define GD_SUPPRESS_PART_SCAN 4 .. and this should be 5 obviously.
On Wed, May 25, 2022 at 06:51:14PM +0200, Christoph Hellwig wrote: > On Wed, May 25, 2022 at 10:35:56PM +0800, Ming Lei wrote: > > > @@ -872,7 +871,8 @@ static ssize_t disk_ext_range_show(struct device *dev, > > > { > > > struct gendisk *disk = dev_to_disk(dev); > > > > > > - return sprintf(buf, "%d\n", disk_max_parts(disk)); > > > + return sprintf(buf, "%d\n", > > > > > > The above change breaks parted on loop, which reads 'ext_range' to add > > partitions. > > That change alone is not the one breaking it alone, as even if the > file reported something else you still could not create new partitions. > > Something like the test below should fix it, but I'll need some more > time to actually test it: > > diff --git a/block/genhd.c b/block/genhd.c > index 36532b9318419..27205ae47d593 100644 > --- a/block/genhd.c > +++ b/block/genhd.c > @@ -385,6 +385,8 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode) > > if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) > return -EINVAL; > + if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) > + return -EINVAL; > if (disk->open_partitions) > return -EBUSY; > > diff --git a/drivers/block/loop.c b/drivers/block/loop.c > index e2cb51810e89a..5bef97ffbe21e 100644 > --- a/drivers/block/loop.c > +++ b/drivers/block/loop.c > @@ -1102,7 +1102,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, > lo->lo_flags |= LO_FLAGS_PARTSCAN; > partscan = lo->lo_flags & LO_FLAGS_PARTSCAN; > if (partscan) > - lo->lo_disk->flags &= ~GENHD_FL_NO_PART; > + clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); > > loop_global_unlock(lo, is_loop); > if (partscan) > @@ -1198,7 +1198,7 @@ static void __loop_clr_fd(struct loop_device *lo, bool release) > */ > lo->lo_flags = 0; > if (!part_shift) > - lo->lo_disk->flags |= GENHD_FL_NO_PART; > + set_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); > mutex_lock(&lo->lo_mutex); > lo->lo_state = Lo_unbound; > mutex_unlock(&lo->lo_mutex); > @@ -1308,7 +1308,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) > > if (!err && (lo->lo_flags & LO_FLAGS_PARTSCAN) && > !(prev_lo_flags & LO_FLAGS_PARTSCAN)) { > - lo->lo_disk->flags &= ~GENHD_FL_NO_PART; > + clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state); > partscan = true; > } > out_unlock: > @@ -2011,7 +2011,7 @@ static int loop_add(int i) > * userspace tools. Parameters like this in general should be avoided. > */ > if (!part_shift) > - disk->flags |= GENHD_FL_NO_PART; > + set_bit(GD_SUPPRESS_PART_SCAN, &disk->state); > mutex_init(&lo->lo_mutex); > lo->lo_number = i; > spin_lock_init(&lo->lo_lock); > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h > index 1b24c1fb3bb1e..bf0c85cfdd8bf 100644 > --- a/include/linux/blkdev.h > +++ b/include/linux/blkdev.h > @@ -147,6 +147,7 @@ struct gendisk { > #define GD_DEAD 2 > #define GD_NATIVE_CAPACITY 3 > #define GD_ADDED 4 > +#define GD_SUPPRESS_PART_SCAN 4 > > struct mutex open_mutex; /* open/close mutex */ > unsigned open_partitions; /* number of open partitions */ The patch itself can fix the issue in this test case, since ext_range recovers to 256. BTW, SUPPRESS_PART_SCAN looks more like one flag, instead of 'state'. Thanks, Ming
On Thu, May 26, 2022 at 11:06:47AM +0800, Ming Lei wrote:
> BTW, SUPPRESS_PART_SCAN looks more like one flag, instead of 'state'.
It is kinda inbetween, but I favour the state. ->flags is suppoed to be
set statically at initialization time, and the GENHD_FL_NO_PART usage
by loop is the only thing that violates it. And once a device declares
support for partitions supresing the scans is basically a policy and thus
a state anyway.
diff --git a/block/genhd.c b/block/genhd.c index 09abd41249fd4..e9346fae48ad4 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -376,7 +376,7 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode) { struct block_device *bdev; - if (!disk_part_scan_enabled(disk)) + if (disk->flags & GENHD_FL_NO_PART) return -EINVAL; if (disk->open_partitions) return -EBUSY; @@ -438,7 +438,6 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, return ret; disk->major = BLOCK_EXT_MAJOR; disk->first_minor = ret; - disk->flags |= GENHD_FL_EXT_DEVT; } ret = disk_alloc_events(disk); @@ -872,7 +871,8 @@ static ssize_t disk_ext_range_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); - return sprintf(buf, "%d\n", disk_max_parts(disk)); + return sprintf(buf, "%d\n", + (disk->flags & GENHD_FL_NO_PART) ? 1 : DISK_MAX_PARTS); } static ssize_t disk_removable_show(struct device *dev, diff --git a/block/partitions/core.c b/block/partitions/core.c index 520292fee9339..c2a1635922b1c 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -98,13 +98,12 @@ static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors) static struct parsed_partitions *allocate_partitions(struct gendisk *hd) { struct parsed_partitions *state; - int nr; + int nr = DISK_MAX_PARTS; state = kzalloc(sizeof(*state), GFP_KERNEL); if (!state) return NULL; - nr = disk_max_parts(hd); state->parts = vzalloc(array_size(nr, sizeof(state->parts[0]))); if (!state->parts) { kfree(state); @@ -326,7 +325,7 @@ static struct block_device *add_partition(struct gendisk *disk, int partno, lockdep_assert_held(&disk->open_mutex); - if (partno >= disk_max_parts(disk)) + if (partno >= DISK_MAX_PARTS) return ERR_PTR(-EINVAL); /* @@ -604,7 +603,7 @@ static int blk_add_partitions(struct gendisk *disk) struct parsed_partitions *state; int ret = -EAGAIN, p; - if (!disk_part_scan_enabled(disk)) + if (disk->flags & GENHD_FL_NO_PART) return 0; state = check_partition(disk); @@ -687,7 +686,7 @@ int bdev_disk_changed(struct gendisk *disk, bool invalidate) * userspace for this particular setup. */ if (invalidate) { - if (disk_part_scan_enabled(disk) || + if (!(disk->flags & GENHD_FL_NO_PART) || !(disk->flags & GENHD_FL_REMOVABLE)) set_capacity(disk, 0); } diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c index bf5c124c5452a..1eec5113d0b5b 100644 --- a/drivers/block/amiflop.c +++ b/drivers/block/amiflop.c @@ -1790,6 +1790,7 @@ static int fd_alloc_disk(int drive, int system) disk->first_minor = drive + system; disk->minors = 1; disk->fops = &floppy_fops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE; if (system) sprintf(disk->disk_name, "fd%d_msdos", drive); diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c index bf769e6e32fef..f3ff9babdb5cd 100644 --- a/drivers/block/ataflop.c +++ b/drivers/block/ataflop.c @@ -2000,6 +2000,7 @@ static int ataflop_alloc_disk(unsigned int drive, unsigned int type) disk->minors = 1; sprintf(disk->disk_name, "fd%d", drive); disk->fops = &floppy_fops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE; disk->private_data = &unit[drive]; set_capacity(disk, MAX_DISK_SIZE * 2); diff --git a/drivers/block/brd.c b/drivers/block/brd.c index a896ee175d863..8fe2e4289dae3 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -405,7 +405,6 @@ static int brd_alloc(int i) disk->minors = max_part; disk->fops = &brd_fops; disk->private_data = brd; - disk->flags = GENHD_FL_EXT_DEVT; strlcpy(disk->disk_name, buf, DISK_NAME_LEN); set_capacity(disk, rd_size * 2); diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 53ba2dddba6e6..07b3c6093e7db 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2734,6 +2734,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig disk->first_minor = minor; disk->minors = 1; disk->fops = &drbd_ops; + disk->flags |= GENHD_FL_NO_PART; sprintf(disk->disk_name, "drbd%d", minor); disk->private_data = device; diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index c4267da716fe6..7f0a60c4079fd 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4503,6 +4503,7 @@ static int floppy_alloc_disk(unsigned int drive, unsigned int type) disk->first_minor = TOMINOR(drive) | (type << 2); disk->minors = 1; disk->fops = &floppy_fops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE; if (type) sprintf(disk->disk_name, "fd%d_type%d", drive, type); diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 7219d98c6fb8a..0954ea8cf9e3b 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -2033,7 +2033,6 @@ static int loop_add(int i) */ if (!part_shift) disk->flags |= GENHD_FL_NO_PART; - disk->flags |= GENHD_FL_EXT_DEVT; atomic_set(&lo->lo_refcnt, 0); mutex_init(&lo->lo_mutex); lo->lo_number = i; diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index eb17def1f265e..54f7d490f8ebb 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -1850,7 +1850,6 @@ static int null_gendisk_register(struct nullb *nullb) set_capacity(disk, size); - disk->flags |= GENHD_FL_EXT_DEVT; disk->major = null_major; disk->first_minor = nullb->index; disk->minors = 1; diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c index 430ee8004a514..255fd3d4b8a84 100644 --- a/drivers/block/paride/pcd.c +++ b/drivers/block/paride/pcd.c @@ -928,6 +928,7 @@ static int pcd_init_unit(struct pcd_unit *cd, bool autoprobe, int port, disk->minors = 1; strcpy(disk->disk_name, cd->name); /* umm... */ disk->fops = &pcd_bdops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE; disk->event_flags = DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c index bf8d0ef41a0a2..b84a6448a4f75 100644 --- a/drivers/block/paride/pf.c +++ b/drivers/block/paride/pf.c @@ -942,6 +942,7 @@ static int __init pf_init_unit(struct pf_unit *pf, bool autoprobe, int port, disk->minors = 1; strcpy(disk->disk_name, pf->name); disk->fops = &pf_fops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE; disk->private_data = pf; diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index b53f648302c15..3af0499857ecf 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2719,7 +2719,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) disk->first_minor = idx; disk->minors = 1; disk->fops = &pktcdvd_ops; - disk->flags = GENHD_FL_REMOVABLE; + disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; strcpy(disk->disk_name, pd->name); disk->private_data = pd; diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c index c1876646a4cb9..4f90819e245e9 100644 --- a/drivers/block/ps3vram.c +++ b/drivers/block/ps3vram.c @@ -742,6 +742,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev) priv->gendisk = gendisk; gendisk->major = ps3vram_major; gendisk->minors = 1; + gendisk->flags |= GENHD_FL_NO_PART; gendisk->fops = &ps3vram_fops; gendisk->private_data = dev; strlcpy(gendisk->disk_name, DEVICE_NAME, sizeof(gendisk->disk_name)); diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 953fa134cd3db..8f140da1efe30 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -4924,12 +4924,10 @@ static int rbd_init_disk(struct rbd_device *rbd_dev) rbd_dev->dev_id); disk->major = rbd_dev->major; disk->first_minor = rbd_dev->minor; - if (single_major) { + if (single_major) disk->minors = (1 << RBD_SINGLE_MAJOR_PART_SHIFT); - disk->flags |= GENHD_FL_EXT_DEVT; - } else { + else disk->minors = RBD_MINORS_PER_MAJOR; - } disk->fops = &rbd_bd_ops; disk->private_data = rbd_dev; diff --git a/drivers/block/swim.c b/drivers/block/swim.c index 821594cd13151..fef65a18d56fa 100644 --- a/drivers/block/swim.c +++ b/drivers/block/swim.c @@ -840,6 +840,7 @@ static int swim_floppy_init(struct swim_priv *swd) swd->unit[drive].disk->minors = 1; sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive); swd->unit[drive].disk->fops = &floppy_fops; + swd->unit[drive].disk->flags |= GENHD_FL_NO_PART; swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE; swd->unit[drive].disk->private_data = &swd->unit[drive]; set_capacity(swd->unit[drive].disk, 2880); diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c index 4b91c9aa58926..6c39f2c9f806d 100644 --- a/drivers/block/swim3.c +++ b/drivers/block/swim3.c @@ -1227,7 +1227,7 @@ static int swim3_attach(struct macio_dev *mdev, disk->fops = &floppy_fops; disk->private_data = fs; disk->events = DISK_EVENT_MEDIA_CHANGE; - disk->flags |= GENHD_FL_REMOVABLE; + disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; sprintf(disk->disk_name, "fd%d", floppy_count); set_capacity(disk, 2880); rc = add_disk(disk); diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 97bf051a50ced..5bb11a8b02652 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -843,7 +843,6 @@ static int virtblk_probe(struct virtio_device *vdev) vblk->disk->minors = 1 << PART_BITS; vblk->disk->private_data = vblk; vblk->disk->fops = &virtblk_fops; - vblk->disk->flags |= GENHD_FL_EXT_DEVT; vblk->index = index; /* configure queue flush support */ diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c index ccc52c935fafc..7a6ed83481b8d 100644 --- a/drivers/block/z2ram.c +++ b/drivers/block/z2ram.c @@ -327,6 +327,7 @@ static int z2ram_register_disk(int minor) disk->major = Z2RAM_MAJOR; disk->first_minor = minor; disk->minors = 1; + disk->flags |= GENHD_FL_NO_PART; disk->fops = &z2_fops; if (minor) sprintf(disk->disk_name, "z2ram%d", minor); diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 08d7953ec5f10..b4a6a832afe33 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1945,6 +1945,7 @@ static int zram_add(void) zram->disk->major = zram_major; zram->disk->first_minor = device_id; zram->disk->minors = 1; + zram->disk->flags |= GENHD_FL_NO_PART; zram->disk->fops = &zram_devops; zram->disk->private_data = zram; snprintf(zram->disk->disk_name, 16, "zram%d", device_id); diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c index d50cc1fd34d5f..faead41709bcd 100644 --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -719,6 +719,7 @@ static void probe_gdrom_setupdisk(void) gd.disk->major = gdrom_major; gd.disk->first_minor = 1; gd.disk->minors = 1; + gd.disk->flags |= GENHD_FL_NO_PART; strcpy(gd.disk->disk_name, GDROM_DEV_NAME); } diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 662742a310cbb..280918cdcabd3 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1778,6 +1778,7 @@ static struct mapped_device *alloc_dev(int minor) md->disk->major = _major; md->disk->first_minor = minor; md->disk->minors = 1; + md->disk->flags |= GENHD_FL_NO_PART; md->disk->fops = &dm_blk_dops; md->disk->queue = md->queue; md->disk->private_data = md; diff --git a/drivers/md/md.c b/drivers/md/md.c index 5111ed966947e..7fbf6f0ac01be 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5707,11 +5707,6 @@ static int md_alloc(dev_t dev, char *name) mddev->queue = disk->queue; blk_set_stacking_limits(&mddev->queue->limits); blk_queue_write_cache(mddev->queue, true, true); - /* Allow extended partitions. This makes the - * 'mdp' device redundant, but we can't really - * remove it now. - */ - disk->flags |= GENHD_FL_EXT_DEVT; disk->events |= DISK_EVENT_MEDIA_CHANGE; mddev->gendisk = disk; error = add_disk(disk); diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 2dd93d49d822c..5e0960560eab7 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2395,7 +2395,6 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, md->disk->private_data = md; md->parent = parent; set_disk_ro(md->disk, md->read_only || default_ro); - md->disk->flags = GENHD_FL_EXT_DEVT; if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT)) md->disk->flags |= GENHD_FL_NO_PART; diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c index 302426ab30f8d..a78fdf3b30f7e 100644 --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -430,6 +430,7 @@ int ubiblock_create(struct ubi_volume_info *vi) ret = -ENODEV; goto out_cleanup_disk; } + gd->flags |= GENHD_FL_NO_PART; gd->private_data = dev; sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id); set_capacity(gd, disk_capacity); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 65875a598d629..bba1f5dafd387 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3566,7 +3566,6 @@ static int sd_probe(struct device *dev) sd_revalidate_disk(gd); - gd->flags = GENHD_FL_EXT_DEVT; if (sdp->removable) { gd->flags |= GENHD_FL_REMOVABLE; gd->events |= DISK_EVENT_MEDIA_CHANGE; diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 6646797a7756e..cf093387e42a1 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -684,6 +684,7 @@ static int sr_probe(struct device *dev) disk->minors = 1; sprintf(disk->disk_name, "sr%d", minor); disk->fops = &sr_bdops; + disk->flags |= GENHD_FL_NO_PART; disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 64a2f33ae9ea4..b8ced80178d64 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -46,11 +46,6 @@ struct partition_meta_info { * Must not be set for devices which are removed entirely when the * media is removed. * - * ``GENHD_FL_EXT_DEVT`` (0x0040): the driver supports extended - * dynamic ``dev_t``, i.e. it wants extended device numbers - * (``BLOCK_EXT_MAJOR``). - * This affects the maximum number of partitions. - * * ``GENHD_FL_NO_PART`` (0x0200): partition support is disabled. * The kernel will not scan for partitions from add_disk, and users * can't add partitions manually. @@ -64,7 +59,6 @@ struct partition_meta_info { #define GENHD_FL_REMOVABLE 0x0001 /* 2 is unused (used to be GENHD_FL_DRIVERFS) */ /* 4 is unused (used to be GENHD_FL_MEDIA_CHANGE_NOTIFY) */ -#define GENHD_FL_EXT_DEVT 0x0040 #define GENHD_FL_NO_PART 0x0200 #define GENHD_FL_HIDDEN 0x0400 @@ -94,13 +88,13 @@ struct blk_integrity { }; struct gendisk { - /* major, first_minor and minors are input parameters only, - * don't use directly. Use disk_devt() and disk_max_parts(). + /* + * major/first_minor/minors should not be set by any new driver, the + * block core will take care of allocating them automatically. */ - int major; /* major number of driver */ + int major; int first_minor; - int minors; /* maximum number of minors, =1 for - * disks that can't be partitioned. */ + int minors; char disk_name[DISK_NAME_LEN]; /* name of major driver */ @@ -164,18 +158,6 @@ static inline bool disk_live(struct gendisk *disk) #define disk_to_cdi(disk) NULL #endif -static inline int disk_max_parts(struct gendisk *disk) -{ - if (disk->flags & GENHD_FL_EXT_DEVT) - return DISK_MAX_PARTS; - return disk->minors; -} - -static inline bool disk_part_scan_enabled(struct gendisk *disk) -{ - return disk_max_parts(disk) > 1 && !(disk->flags & GENHD_FL_NO_PART); -} - static inline dev_t disk_devt(struct gendisk *disk) { return MKDEV(disk->major, disk->first_minor);
All modern drivers can support extra partitions using the extended dev_t. In fact except for the ioctl method drivers never even see partitions in normal operation. So remove the GENHD_FL_EXT_DEVT and allow extra partitions for all block devices that do support partitions, and require those that do not support partitions to explicit disallow them using GENHD_FL_NO_PART. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/genhd.c | 6 +++--- block/partitions/core.c | 9 ++++----- drivers/block/amiflop.c | 1 + drivers/block/ataflop.c | 1 + drivers/block/brd.c | 1 - drivers/block/drbd/drbd_main.c | 1 + drivers/block/floppy.c | 1 + drivers/block/loop.c | 1 - drivers/block/null_blk/main.c | 1 - drivers/block/paride/pcd.c | 1 + drivers/block/paride/pf.c | 1 + drivers/block/pktcdvd.c | 2 +- drivers/block/ps3vram.c | 1 + drivers/block/rbd.c | 6 ++---- drivers/block/swim.c | 1 + drivers/block/swim3.c | 2 +- drivers/block/virtio_blk.c | 1 - drivers/block/z2ram.c | 1 + drivers/block/zram/zram_drv.c | 1 + drivers/cdrom/gdrom.c | 1 + drivers/md/dm.c | 1 + drivers/md/md.c | 5 ----- drivers/mmc/core/block.c | 1 - drivers/mtd/ubi/block.c | 1 + drivers/scsi/sd.c | 1 - drivers/scsi/sr.c | 1 + include/linux/genhd.h | 28 +++++----------------------- 27 files changed, 30 insertions(+), 48 deletions(-)