diff options
author | Darrick J. Wong <djwong@us.ibm.com> | 2006-03-27 01:17:54 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-27 08:44:59 -0800 |
commit | 3ac51e741a46af7a20f55e79d3e3aeaa93c6c544 (patch) | |
tree | cab595a4d9691d7602616337b7862a1a3d692b97 /drivers/md/dm.c | |
parent | 1134e5ae79bab61c05657ca35a6297cf87202e35 (diff) |
[PATCH] dm store geometry
Allow drive geometry to be stored with a new DM_DEV_SET_GEOMETRY ioctl.
Device-mapper will now respond to HDIO_GETGEO. If the geometry information is
not available, zero will be returned for all of the parameters.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r-- | drivers/md/dm.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b99df48cffed..973e63d530ae 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -17,6 +17,7 @@ #include <linux/mempool.h> #include <linux/slab.h> #include <linux/idr.h> +#include <linux/hdreg.h> #include <linux/blktrace_api.h> static const char *_name = DM_NAME; @@ -102,6 +103,9 @@ struct mapped_device { */ struct super_block *frozen_sb; struct block_device *suspended_bdev; + + /* forced geometry settings */ + struct hd_geometry geometry; }; #define MIN_IOS 256 @@ -227,6 +231,13 @@ static int dm_blk_close(struct inode *inode, struct file *file) return 0; } +static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct mapped_device *md = bdev->bd_disk->private_data; + + return dm_get_geometry(md, geo); +} + static inline struct dm_io *alloc_io(struct mapped_device *md) { return mempool_alloc(md->io_pool, GFP_NOIO); @@ -313,6 +324,33 @@ struct dm_table *dm_get_table(struct mapped_device *md) return t; } +/* + * Get the geometry associated with a dm device + */ +int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo) +{ + *geo = md->geometry; + + return 0; +} + +/* + * Set the geometry of a device. + */ +int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo) +{ + sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors; + + if (geo->start > sz) { + DMWARN("Start sector is beyond the geometry limits."); + return -EINVAL; + } + + md->geometry = *geo; + + return 0; +} + /*----------------------------------------------------------------- * CRUD START: * A more elegant soln is in the works that uses the queue @@ -906,6 +944,13 @@ static int __bind(struct mapped_device *md, struct dm_table *t) sector_t size; size = dm_table_get_size(t); + + /* + * Wipe any geometry if the size of the table changed. + */ + if (size != get_capacity(md->disk)) + memset(&md->geometry, 0, sizeof(md->geometry)); + __set_size(md, size); if (size == 0) return 0; @@ -1261,6 +1306,7 @@ int dm_suspended(struct mapped_device *md) static struct block_device_operations dm_blk_dops = { .open = dm_blk_open, .release = dm_blk_close, + .getgeo = dm_blk_getgeo, .owner = THIS_MODULE }; |