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[PATCH] md: replace magic numbers in sb_dirty with well defined bit flags

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Instead of magic numbers (0,1,2,3) in sb_dirty, we have
some flags instead:
MD_CHANGE_DEVS
   Some device state has changed requiring superblock update
   on all devices.
MD_CHANGE_CLEAN
   The array has transitions from 'clean' to 'dirty' or back,
   requiring a superblock update on active devices, but possibly
   not on spares
MD_CHANGE_PENDING
   A superblock update is underway.

We wait for an update to complete by waiting for all flags to be clear.  A
flag can be set at any time, even during an update, without risk that the
change will be lost.

Stop exporting md_update_sb - isn't needed.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2006-10-03 01:15:46 -07:00
committed by Linus Torvalds
parent 6814d5368d
commit 850b2b420c
7 changed files with 52 additions and 46 deletions
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6
include/linux/raid/md_k.h
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@@ -116,7 +116,11 @@ struct mddev_s
dev_t unit;
int md_minor;
struct list_head disks;
int sb_dirty;
unsigned long flags;
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
#define MD_CHANGE_PENDING 2 /* superblock update in progress */
int ro;
struct gendisk *gendisk;