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Linux 5.17 compat: GENHD_FL_EXT_DEVT / GENHD_FL_NO_PART_SCAN

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As of the 5.17 kernel the GENHD_FL_EXT_DEVT flag has been removed
and the GENHD_FL_NO_PART_SCAN flag renamed GENHD_FL_NO_PART. Update
zvol_alloc() to set GENHD_FL_NO_PART for the newer kernels which
is sufficient.  The behavior for prior kernels remains unchanged.

1ebe2e5f ("block: remove GENHD_FL_EXT_DEVT")
46e7eac6 ("block: rename GENHD_FL_NO_PART_SCAN to GENHD_FL_NO_PART")

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13294
Closes #13297
This commit is contained in:
Brian Behlendorf
2022-04-19 10:38:04 -07:00
committed by GitHub
parent ec4d860eb0
commit 026f126b83
3 changed files with 68 additions and 13 deletions
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module/os/linux/zfs/zvol_os.c
+8 -13
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@@ -906,22 +906,17 @@ zvol_alloc(dev_t dev, const char *name)
zso->zvo_disk->major = zvol_major;
zso->zvo_disk->events = DISK_EVENT_MEDIA_CHANGE;
/*
* Setting ZFS_VOLMODE_DEV disables partitioning on ZVOL devices.
* This is accomplished by limiting the number of minors for the
* device to one and explicitly disabling partition scanning.
*/
if (volmode == ZFS_VOLMODE_DEV) {
/*
* ZFS_VOLMODE_DEV disable partitioning on ZVOL devices: set
* gendisk->minors = 1 as noted in include/linux/blkdev.h.
* Also disable extended partition numbers (GENHD_FL_EXT_DEVT)
* and suppresses partition scanning (GENHD_FL_NO_PART_SCAN)
* setting gendisk->flags accordingly.
*/
zso->zvo_disk->minors = 1;
#if defined(GENHD_FL_EXT_DEVT)
zso->zvo_disk->flags &= ~GENHD_FL_EXT_DEVT;
#endif
#if defined(GENHD_FL_NO_PART_SCAN)
zso->zvo_disk->flags |= GENHD_FL_NO_PART_SCAN;
#endif
zso->zvo_disk->flags &= ~ZFS_GENHD_FL_EXT_DEVT;
zso->zvo_disk->flags |= ZFS_GENHD_FL_NO_PART;
}
zso->zvo_disk->first_minor = (dev & MINORMASK);
zso->zvo_disk->fops = &zvol_ops;
zso->zvo_disk->private_data = zv;