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[PATCH] md: limit size of sb read/written to appropriate amount

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version-1 superblocks are not (normally) 4K long, and can be of variable size.
 Writing the full 4K can cause corruption (but only in non-default
configurations).

With this patch the super-block-flavour can choose a size to read, and set a
size to write based on what it finds.

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
2005-09-09 16:23:53 -07:00
committed by Linus Torvalds
parent 773f783442
commit 0002b2718d
2 changed files with 16 additions and 5 deletions
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include/linux/raid/md_k.h
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@@ -102,6 +102,7 @@ struct mdk_rdev_s
int sb_loaded;
sector_t data_offset; /* start of data in array */
sector_t sb_offset;
int sb_size; /* bytes in the superblock */
int preferred_minor; /* autorun support */
/* A device can be in one of three states based on two flags: