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authorNeilBrown <neilb@suse.de>2011-01-31 12:10:09 +1100
committerNeilBrown <neilb@suse.de>2011-01-31 12:10:09 +1100
commitf21e9ff7f77d41ceca4e1e5ee5a4efa5ad7a5e40 (patch)
treec6bf9c0457ae891505983c1493bf15856e815c5b /drivers/md
parent50da08409654e036c4c964a473567a61a654cb83 (diff)
downloadop-kernel-dev-f21e9ff7f77d41ceca4e1e5ee5a4efa5ad7a5e40.zip
op-kernel-dev-f21e9ff7f77d41ceca4e1e5ee5a4efa5ad7a5e40.tar.gz
md: Remove the AllReserved flag for component devices.
This flag is not needed and is used badly. Devices that are included in a native-metadata array are reserved exclusively for that array - and currently have AllReserved set. They all are bd_claimed for the rdev and so cannot be shared. Devices that are included in external-metadata arrays can be shared among multiple arrays - providing there is no overlap. These are bd_claimed for md in general - not for a particular rdev. When changing the amount of a device that is used in an array we need to check for overlap. This currently includes a check on AllReserved So even without overlap, sharing with an AllReserved device is not allowed. However the bd_claim usage already precludes sharing with these devices, so the test on AllReserved is not needed. And in fact it is wrong. As this is the only use of AllReserved, simply remove all usage and definition of AllReserved. Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c13
-rw-r--r--drivers/md/md.h2
2 files changed, 5 insertions, 10 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e636e404..f539b58 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1947,8 +1947,6 @@ static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
__bdevname(dev, b));
return PTR_ERR(bdev);
}
- if (!shared)
- set_bit(AllReserved, &rdev->flags);
rdev->bdev = bdev;
return err;
}
@@ -2610,12 +2608,11 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
mddev_lock(mddev);
list_for_each_entry(rdev2, &mddev->disks, same_set)
- if (test_bit(AllReserved, &rdev2->flags) ||
- (rdev->bdev == rdev2->bdev &&
- rdev != rdev2 &&
- overlaps(rdev->data_offset, rdev->sectors,
- rdev2->data_offset,
- rdev2->sectors))) {
+ if (rdev->bdev == rdev2->bdev &&
+ rdev != rdev2 &&
+ overlaps(rdev->data_offset, rdev->sectors,
+ rdev2->data_offset,
+ rdev2->sectors)) {
overlap = 1;
break;
}
diff --git a/drivers/md/md.h b/drivers/md/md.h
index eec517c..7e90b85 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -93,8 +93,6 @@ struct mdk_rdev_s
#define Faulty 1 /* device is known to have a fault */
#define In_sync 2 /* device is in_sync with rest of array */
#define WriteMostly 4 /* Avoid reading if at all possible */
-#define AllReserved 6 /* If whole device is reserved for
- * one array */
#define AutoDetected 7 /* added by auto-detect */
#define Blocked 8 /* An error occured on an externally
* managed array, don't allow writes
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