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| author | Tejun Heo <tj@kernel.org> | 2011-08-23 20:01:04 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-08-23 20:01:04 +0200 |
| commit | d27769ec3df1a8de9ca450d2dcd72d1ab259ba32 (patch) | |
| tree | f17c064e0d8ac26fa80c1c72dccaca053bb55e94 /include/linux/genhd.h | |
| parent | 322a8b034003c0d46d39af85bf24fee27b902f48 (diff) | |
| download | linux-d27769ec3df1a8de9ca450d2dcd72d1ab259ba32.tar.gz linux-d27769ec3df1a8de9ca450d2dcd72d1ab259ba32.tar.bz2 linux-d27769ec3df1a8de9ca450d2dcd72d1ab259ba32.zip | |
block: add GENHD_FL_NO_PART_SCAN
There are cases where suppressing partition scan is useful - e.g. for
lo devices and pseudo SATA devices which advertise to be a disk but
get upset on partition scan (some port multiplier control devices show
such behavior).
This patch adds GENHD_FL_NO_PART_SCAN which suppresses partition scan
regardless of the number of possible partitions. disk_partitionable()
is renamed to disk_part_scan_enabled() as suppressing partition scan
doesn't imply the device can't be partitioned using
BLKPG_ADD/DEL_PARTITION calls from userland. show_partition() now
directly tests disk_max_parts() to maintain backward-compatibility.
-v2: Updated to make it clear that only partition scan is suppressed
not partitioning itself as suggested by Kay Sievers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 02fa4697a0e5..6d18f3531f18 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -128,6 +128,7 @@ struct hd_struct { #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ #define GENHD_FL_NATIVE_CAPACITY 128 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 +#define GENHD_FL_NO_PART_SCAN 512 enum { DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ @@ -234,9 +235,10 @@ static inline int disk_max_parts(struct gendisk *disk) return disk->minors; } -static inline bool disk_partitionable(struct gendisk *disk) +static inline bool disk_part_scan_enabled(struct gendisk *disk) { - return disk_max_parts(disk) > 1; + return disk_max_parts(disk) > 1 && + !(disk->flags & GENHD_FL_NO_PART_SCAN); } static inline dev_t disk_devt(struct gendisk *disk) |