diff options
| author | David Howells <dhowells@redhat.com> | 2009-02-12 10:40:00 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-03-24 09:00:19 +0000 |
| commit | 402d326519c1a4859c527702383f4e60f606ef52 (patch) | |
| tree | beb302d56d7671d372ae73f2664feed2a5b1226d /include/linux | |
| parent | 9ce969082e490d0a5a81862b364337c93dc3482a (diff) | |
| download | op-kernel-dev-402d326519c1a4859c527702383f4e60f606ef52.zip op-kernel-dev-402d326519c1a4859c527702383f4e60f606ef52.tar.gz | |
NOMMU: Present backing device capabilities for MTD chardevs
Present backing device capabilities for MTD character device files to allow
NOMMU mmap to do direct mapping where possible.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mtd/mtd.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 3aa5d77..0c079fd 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -162,6 +162,20 @@ struct mtd_info { /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len); + /* Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ + unsigned long (*get_unmapped_area) (struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags); + + /* Backing device capabilities for this device + * - provides mmap capabilities + */ + struct backing_dev_info *backing_dev_info; + int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf); int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf); |
