diff mbox series

[2/9] block: add a bdev_is_partition helper

Message ID 20200903054104.228829-3-hch@lst.de
State New, archived
Headers show
Series [1/9] Documentation/hdio: fix up obscure bd_contains references | expand

Commit Message

Christoph Hellwig Sept. 3, 2020, 5:40 a.m. UTC
Add a littler helper to make the somewhat arcane bd_contains checks a
little more obvious.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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(-)

Comments

Ulf Hansson Sept. 3, 2020, 8:19 a.m. UTC | #1
On Thu, 3 Sep 2020 at 07:42, Christoph Hellwig <hch@lst.de> wrote:
>
> Add a littler helper to make the somewhat arcane bd_contains checks a
> little more obvious.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

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

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

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
>
Christoph Hellwig Sept. 3, 2020, 8:26 a.m. UTC | #2
On Thu, Sep 03, 2020 at 10:19:34AM +0200, Ulf Hansson wrote:
> On Thu, 3 Sep 2020 at 07:42, Christoph Hellwig <hch@lst.de> wrote:
> >
> > Add a littler helper to make the somewhat arcane bd_contains checks a
> > little more obvious.
> >
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Not sure why we have both "bd_contains" and "bd_partno", nevertheless,
> feel free to add:

Right now both are needed for how blkdev_get/put work.  But I plan to
eventual kill off bd_contains after some major surgery to that code.
diff mbox series

Patch

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);