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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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6
include/linux/device-mapper.h
View file

@ -9,11 +9,13 @@
#define _LINUX_DEVICE_MAPPER_H
#include <linux/bio.h>
#include <linux/blkdev.h>
struct dm_target;
struct dm_table;
struct dm_dev;
struct mapped_device;
struct bio_vec;
typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
@ -72,6 +74,9 @@ typedef int (*dm_ioctl_fn) (struct dm_target *ti, struct inode *inode,
struct file *filp, unsigned int cmd,
unsigned long arg);
typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size);
void dm_error(const char *message);
/*
@ -107,6 +112,7 @@ struct target_type {
dm_status_fn status;
dm_message_fn message;
dm_ioctl_fn ioctl;
dm_merge_fn merge;
};
struct io_restrictions {