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[PATCH] dm table: add target preresume

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This patch adds a target preresume hook.

It is called before the targets are resumed and if it returns an error the
resume gets cancelled.

The crypt target will use this to indicate that it is unable to process I/O
because no encryption key has been supplied.

Signed-off-by: Milan Broz <mbroz@redhat.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>
This commit is contained in:
Milan Broz 2006-10-03 01:15:36 -07:00 • committed by Linus Torvalds
commit 8757b7764f
5 changed files with 23 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/device-mapper.h
View file

@ -57,6 +57,7 @@ typedef int (*dm_endio_fn) (struct dm_target *ti,
typedef void (*dm_presuspend_fn) (struct dm_target *ti);
typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
typedef int (*dm_preresume_fn) (struct dm_target *ti);
typedef void (*dm_resume_fn) (struct dm_target *ti);
typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
@ -92,6 +93,7 @@ struct target_type {
dm_endio_fn end_io;
dm_presuspend_fn presuspend;
dm_postsuspend_fn postsuspend;
dm_preresume_fn preresume;
dm_resume_fn resume;
dm_status_fn status;
dm_message_fn message;

4
include/linux/dm-ioctl.h
View file

@ -285,9 +285,9 @@ typedef char ioctl_struct[308];
#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 8
#define DM_VERSION_MINOR 9
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2006-06-24)"
#define DM_VERSION_EXTRA "-ioctl (2006-09-14)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */