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block: add a bdev_is_partition helper 

Add a littler helper to make the somewhat arcane bd_contains checks a
little more obvious.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-09-03 07:40:57 +02:00 committed by Jens Axboe
parent 250eec9e39
commit fa01b1e973
10 changed files with 22 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk-lib.c
View File

@ -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) {

4
block/ioctl.c
View File

@ -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;

2
block/scsi_ioctl.c
View File

@ -852,7 +852,7 @@ 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))

4
drivers/ide/ide-ioctls.c
View File

@ -49,7 +49,7 @@ read_val:
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:

2
drivers/md/dm-table.c
View File

@ -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);

2
drivers/mmc/core/block.c
View File

@ -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;
}

8
drivers/s390/block/dasd_ioctl.c
View File

@ -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))

4
fs/nfsd/blocklayout.c
View File

@ -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));
}

9
include/linux/blkdev.h
View File

@ -1353,6 +1353,11 @@ 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,
@ -1469,7 +1474,7 @@ 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;
@ -1510,7 +1515,7 @@ 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;

2
kernel/trace/blktrace.c
View File

@ -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);