Re: [PATCH 2/9] block: add a bdev_is_partition helper

From: Ulf Hansson
Date: Thu Sep 03 2020 - 04:20:23 EST

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In reply to: Christoph Hellwig: "[PATCH 2/9] block: add a bdev_is_partition helper"
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On Thu, 3 Sep 2020 at 07:42, Christoph Hellwig <hch@xxxxxx> wrote:
>
> Add a littler helper to make the somewhat arcane bd_contains checks a
> little more obvious.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Not sure why we have both "bd_contains" and "bd_partno", nevertheless,
feel free to add:

Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>

Kind regards
Uffe

> ---
> block/blk-lib.c | 2 +-
> block/ioctl.c | 4 ++--
> block/scsi_ioctl.c | 2 +-
> drivers/ide/ide-ioctls.c | 4 ++--
> drivers/md/dm-table.c | 2 +-
> drivers/mmc/core/block.c | 2 +-
> drivers/s390/block/dasd_ioctl.c | 8 ++++----
> fs/nfsd/blocklayout.c | 4 ++--
> include/linux/blkdev.h | 9 +++++++--
> kernel/trace/blktrace.c | 2 +-
> 10 files changed, 22 insertions(+), 17 deletions(-)
>
> diff --git a/block/blk-lib.c b/block/blk-lib.c
> index 0d1811e57ac704..e90614fd8d6a42 100644
> --- a/block/blk-lib.c
> +++ b/block/blk-lib.c
> @@ -64,7 +64,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
> return -EINVAL;
>
> /* In case the discard request is in a partition */
> - if (bdev->bd_partno)
> + if (bdev_is_partition(bdev))
> part_offset = bdev->bd_part->start_sect;
>
> while (nr_sects) {
> diff --git a/block/ioctl.c b/block/ioctl.c
> index bdb3bbb253d9f8..e4af3df9d28a68 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> @@ -23,7 +23,7 @@ static int blkpg_do_ioctl(struct block_device *bdev,
> return -EACCES;
> if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
> return -EFAULT;
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> return -EINVAL;
>
> if (p.pno <= 0)
> @@ -94,7 +94,7 @@ static int blkdev_reread_part(struct block_device *bdev)
> {
> int ret;
>
> - if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
> + if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
> return -EINVAL;
> if (!capable(CAP_SYS_ADMIN))
> return -EACCES;
> diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
> index ef722f04f88a93..3bb4571385ce21 100644
> --- a/block/scsi_ioctl.c
> +++ b/block/scsi_ioctl.c
> @@ -854,7 +854,7 @@ EXPORT_SYMBOL(scsi_cmd_ioctl);
>
> int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
> {
> - if (bd && bd == bd->bd_contains)
> + if (bd && !bdev_is_partition(bd))
> return 0;
>
> if (capable(CAP_SYS_RAWIO))
> diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c
> index 09491098047bff..58994da10c0664 100644
> --- a/drivers/ide/ide-ioctls.c
> +++ b/drivers/ide/ide-ioctls.c
> @@ -49,7 +49,7 @@ int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
> return err >= 0 ? put_user_long(err, arg) : err;
>
> set_val:
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> err = -EINVAL;
> else {
> if (!capable(CAP_SYS_ADMIN))
> @@ -257,7 +257,7 @@ int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
> switch (cmd) {
> case HDIO_OBSOLETE_IDENTITY:
> case HDIO_GET_IDENTITY:
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> return -EINVAL;
> return ide_get_identity_ioctl(drive, cmd, argp);
> case HDIO_GET_NICE:
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 5edc3079e7c199..af156256e511ff 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -903,7 +903,7 @@ static int device_is_rq_stackable(struct dm_target *ti, struct dm_dev *dev,
> struct request_queue *q = bdev_get_queue(bdev);
>
> /* request-based cannot stack on partitions! */
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> return false;
>
> return queue_is_mq(q);
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index fa313b63413547..8d3df0be0355ce 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -723,7 +723,7 @@ static int mmc_blk_check_blkdev(struct block_device *bdev)
> * whole block device, not on a partition. This prevents overspray
> * between sibling partitions.
> */
> - if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
> + if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
> return -EPERM;
> return 0;
> }
> diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
> index faaf5596e31c12..cb6427fb9f3d16 100644
> --- a/drivers/s390/block/dasd_ioctl.c
> +++ b/drivers/s390/block/dasd_ioctl.c
> @@ -277,7 +277,7 @@ dasd_ioctl_format(struct block_device *bdev, void __user *argp)
> dasd_put_device(base);
> return -EFAULT;
> }
> - if (bdev != bdev->bd_contains) {
> + if (bdev_is_partition(bdev)) {
> pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
> dev_name(&base->cdev->dev));
> dasd_put_device(base);
> @@ -304,7 +304,7 @@ static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
> base = dasd_device_from_gendisk(bdev->bd_disk);
> if (!base)
> return -ENODEV;
> - if (bdev != bdev->bd_contains) {
> + if (bdev_is_partition(bdev)) {
> pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
> dev_name(&base->cdev->dev));
> rc = -EINVAL;
> @@ -362,7 +362,7 @@ static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp
> rc = -EROFS;
> goto out_err;
> }
> - if (bdev != bdev->bd_contains) {
> + if (bdev_is_partition(bdev)) {
> pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
> dev_name(&base->cdev->dev));
> rc = -EINVAL;
> @@ -540,7 +540,7 @@ dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
>
> if (!capable(CAP_SYS_ADMIN))
> return -EACCES;
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> // ro setting is not allowed for partitions
> return -EINVAL;
> if (get_user(intval, (int __user *)argp))
> diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
> index 311e5ce80cfc27..a07c39c94bbd03 100644
> --- a/fs/nfsd/blocklayout.c
> +++ b/fs/nfsd/blocklayout.c
> @@ -170,7 +170,7 @@ nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
> struct nfs4_client *clp,
> struct nfsd4_getdeviceinfo *gdp)
> {
> - if (sb->s_bdev != sb->s_bdev->bd_contains)
> + if (bdev_is_partition(sb->s_bdev))
> return nfserr_inval;
> return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
> }
> @@ -382,7 +382,7 @@ nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
> struct nfs4_client *clp,
> struct nfsd4_getdeviceinfo *gdp)
> {
> - if (sb->s_bdev != sb->s_bdev->bd_contains)
> + if (bdev_is_partition(sb->s_bdev))
> return nfserr_inval;
> return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
> }
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 7575fa0aae6e5c..0006a78ebc5dde 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1341,6 +1341,11 @@ static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
>
> extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
>
> +static inline bool bdev_is_partition(struct block_device *bdev)
> +{
> + return bdev->bd_partno;
> +}
> +
> enum blk_default_limits {
> BLK_MAX_SEGMENTS = 128,
> BLK_SAFE_MAX_SECTORS = 255,
> @@ -1457,7 +1462,7 @@ static inline int bdev_alignment_offset(struct block_device *bdev)
>
> if (q->limits.misaligned)
> return -1;
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> return queue_limit_alignment_offset(&q->limits,
> bdev->bd_part->start_sect);
> return q->limits.alignment_offset;
> @@ -1498,7 +1503,7 @@ static inline int bdev_discard_alignment(struct block_device *bdev)
> {
> struct request_queue *q = bdev_get_queue(bdev);
>
> - if (bdev != bdev->bd_contains)
> + if (bdev_is_partition(bdev))
> return queue_limit_discard_alignment(&q->limits,
> bdev->bd_part->start_sect);
> return q->limits.discard_alignment;
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index 4b3a42fc3b24f1..157758a88773b9 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -527,7 +527,7 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
> * and scsi-generic block devices we create a temporary new debugfs
> * directory that will be removed once the trace ends.
> */
> - if (bdev && bdev == bdev->bd_contains)
> + if (bdev && !bdev_is_partition(bdev))
> dir = q->debugfs_dir;
> else
> bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root);
> --
> 2.28.0
>

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Previous message: David Hildenbrand: "Re: [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags"
In reply to: Christoph Hellwig: "[PATCH 2/9] block: add a bdev_is_partition helper"
Next in thread: Christoph Hellwig: "Re: [PATCH 2/9] block: add a bdev_is_partition helper"
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