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dm: introduce merge_bvec_fn

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Introduce a bvec merge function for device mapper devices
for dynamic size restrictions.

This code ensures the requested biovec lies within a single
target and then calls a target-specific function to check
against any constraints imposed by underlying devices.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz
2008-07-21 12:00:37 +01:00
committed by Alasdair G Kergon
parent 92e868122e
commit f6fccb1213
3 changed files with 52 additions and 2 deletions
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4
include/linux/dm-ioctl.h
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@@ -256,9 +256,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 13
#define DM_VERSION_MINOR 14
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2007-10-18)"
#define DM_VERSION_EXTRA "-ioctl (2008-04-23)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */