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UBI: allow direct user-space I/O

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Introduce a new ioctl UBI_IOCSETPROP to set properties
on a volume. Also add the first property:
UBI_PROP_DIRECT_WRITE, this property is used to set the
ability to use direct writes in userspace

Signed-off-by: Sidney Amani <seed@uffs.org>
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Sidney Amani
2009-01-27 10:11:46 +01:00
committed by Artem Bityutskiy
parent 36b477d005
commit 766fb95ba0
4 changed files with 66 additions and 19 deletions
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34
include/mtd/ubi-user.h
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@ -124,6 +124,14 @@
* To check if a logical eraseblock is mapped to a physical eraseblock, the
* %UBI_IOCEBISMAP ioctl command should be used. It returns %0 if the LEB is
* not mapped, and %1 if it is mapped.
*
* Set an UBI volume property
* ~~~~~~~~~~~~~~~~~~~~~~~~~
*
* To set an UBI volume property the %UBI_IOCSETPROP ioctl command should be
* used. A pointer to a &struct ubi_set_prop_req object is expected to be
* passed. The object describes which property should be set, and to which value
* it should be set.
*/
/*
@ -175,6 +183,8 @@
#define UBI_IOCEBUNMAP _IOW(UBI_VOL_IOC_MAGIC, 4, int32_t)
/* Check if LEB is mapped command */
#define UBI_IOCEBISMAP _IOR(UBI_VOL_IOC_MAGIC, 5, int32_t)
/* Set an UBI volume property */
#define UBI_IOCSETPROP _IOW(UBI_VOL_IOC_MAGIC, 6, struct ubi_set_prop_req)
/* Maximum MTD device name length supported by UBI */
#define MAX_UBI_MTD_NAME_LEN 127
@ -210,6 +220,16 @@ enum {
UBI_STATIC_VOLUME = 4,
};
/*
* UBI set property ioctl constants
*
* @UBI_PROP_DIRECT_WRITE: allow / disallow user to directly write and
* erase individual eraseblocks on dynamic volumes
*/
enum {
UBI_PROP_DIRECT_WRITE = 1,
};
/**
* struct ubi_attach_req - attach MTD device request.
* @ubi_num: UBI device number to create
@ -373,4 +393,18 @@ struct ubi_map_req {
int8_t padding[3];
} __attribute__ ((packed));
/**
* struct ubi_set_prop_req - a data structure used to set an ubi volume
* property.
* @property: property to set (%UBI_PROP_DIRECT_WRITE)
* @padding: reserved for future, not used, has to be zeroed
* @value: value to set
*/
struct ubi_set_prop_req {
uint8_t property;
uint8_t padding[7];
uint64_t value;
} __attribute__ ((packed));
#endif /* __UBI_USER_H__ */