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[PATCH] md: allow md intent bitmap to be stored near the superblock.

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This provides an alternate to storing the bitmap in a separate file.  The
bitmap can be stored at a given offset from the superblock.  Obviously the
creator of the array must make sure this doesn't intersect with data....
After is good for version-0.90 superblocks.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2005-06-21 17:17:27 -07:00
committed by Linus Torvalds
parent 3d310eb7b3
commit a654b9d8f8
6 changed files with 170 additions and 30 deletions
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15
include/linux/raid/md.h
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@ -60,7 +60,14 @@
*/
#define MD_MAJOR_VERSION 0
#define MD_MINOR_VERSION 90
#define MD_PATCHLEVEL_VERSION 1
/*
* MD_PATCHLEVEL_VERSION indicates kernel functionality.
* >=1 means different superblock formats are selectable using SET_ARRAY_INFO
* and major_version/minor_version accordingly
* >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
* in the super status byte
*/
#define MD_PATCHLEVEL_VERSION 2
extern int register_md_personality (int p_num, mdk_personality_t *p);
extern int unregister_md_personality (int p_num);
@ -78,6 +85,12 @@ extern void md_unplug_mddev(mddev_t *mddev);
extern void md_print_devices (void);
extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
sector_t sector, int size, struct page *page);
extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
struct page *page, int rw);
#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
#endif