diff options
| author | Alexander Viro <viro@math.psu.edu> | 2002-10-15 04:25:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@home.transmeta.com> | 2002-10-15 04:25:32 -0700 |
| commit | 68c16870dcfaba7c9e2dd5055a2caf4edcf42e87 (patch) | |
| tree | 7c15437501c7bcf68bf634bfe88108cb5c62e472 /include | |
| parent | b288f6add39cf474fc2ec8087d32d3e1d4c1c6d0 (diff) | |
[PATCH] refcounts for gendisks
Finally. We use disk->dev.refcount as a gendisk refcount. New helper -
get_disk(): atomic_inc on refcount. get_gendisk() does it on return,
callers of get_gendisk() do put_disk() when they are done.
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/genhd.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 6b859fad6a8a..030ee2f87891 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -266,6 +266,7 @@ extern void add_partition(struct gendisk *, int, sector_t, sector_t); extern void delete_partition(struct gendisk *, int); extern struct gendisk *alloc_disk(int minors); +extern struct gendisk *get_disk(struct gendisk *disk); extern void put_disk(struct gendisk *disk); /* will go away */ @@ -273,9 +274,11 @@ extern void blk_set_probe(int major, struct gendisk *(p)(int)); static inline unsigned int disk_index (kdev_t dev) { - int part; + int part, res; struct gendisk *g = get_gendisk(kdev_t_to_nr(dev), &part); - return g ? (minor(dev) >> g->minor_shift) : 0; + res = g ? (minor(dev) >> g->minor_shift) : 0; + put_disk(g); + return res; } #endif |