[PATCH] md: Fix a few problems with the interface (sysfs and ioctl) to md.

[NeilBrown]

Following patch is suitable for 2.6.20.  It fixes some minor bugs that
need to be fix in order to use new functionality in mdadm-2.6.
Thanks,
NeilBrown


### Comments for Changeset

While developing more functionality in mdadm I found some bugs in md...

- When we remove a device from an inactive array (write 'remove' to 
  the 'state' sysfs file - see 'state_store') would should not
  update the superblock information - as we may not have
  read and processed it all properly yet.

- initialise all raid_disk entries to '-1' else the 'slot sysfs file
  will claim '0' for all devices in an array before the array is
  started.

- all '\n' not to be present at the end of words written to
  sysfs files
- when we use SET_ARRAY_INFO to set the md metadata version,
  set the flag to say that there is persistant metadata.
- allow GET_BITMAP_FILE to be called on an array that hasn't
  been started yet.

Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
 ./drivers/md/md.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c	2006-12-21 16:29:31.000000000 +1100
+++ ./drivers/md/md.c	2006-12-21 16:29:40.000000000 +1100
@@ -1795,7 +1795,8 @@ state_store(mdk_rdev_t *rdev, const char
 		else {
 			mddev_t *mddev = rdev->mddev;
 			kick_rdev_from_array(rdev);
-			md_update_sb(mddev, 1);
+			if (mddev->pers)
+				md_update_sb(mddev, 1);
 			md_new_event(mddev);
 			err = 0;
 		}
@@ -2007,6 +2008,7 @@ static mdk_rdev_t *md_import_device(dev_
 
 	rdev->desc_nr = -1;
 	rdev->saved_raid_disk = -1;
+	rdev->raid_disk = -1;
 	rdev->flags = 0;
 	rdev->data_offset = 0;
 	rdev->sb_events = 0;
@@ -2236,7 +2238,6 @@ static int update_raid_disks(mddev_t *md
 static ssize_t
 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
 {
-	/* can only set raid_disks if array is not yet active */
 	char *e;
 	int rv = 0;
 	unsigned long n = simple_strtoul(buf, &e, 10);
@@ -2634,7 +2635,7 @@ metadata_store(mddev_t *mddev, const cha
 		return -EINVAL;
 	buf = e+1;
 	minor = simple_strtoul(buf, &e, 10);
-	if (e==buf || *e != '\n')
+	if (e==buf || (*e && *e != '\n') )
 		return -EINVAL;
 	if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
 	    super_types[major].name == NULL)
@@ -3984,6 +3985,7 @@ static int set_array_info(mddev_t * mdde
 		mddev->major_version = info->major_version;
 		mddev->minor_version = info->minor_version;
 		mddev->patch_version = info->patch_version;
+		mddev->persistent = ! info->not_persistent;
 		return 0;
 	}
 	mddev->major_version = MD_MAJOR_VERSION;
@@ -4309,9 +4311,10 @@ static int md_ioctl(struct inode *inode,
 	 * Commands querying/configuring an existing array:
 	 */
 	/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
-	 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
+	 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
 	if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
-			&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
+			&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
+	    		&& cmd != GET_BITMAP_FILE) {
 		err = -ENODEV;
 		goto abort_unlock;
 	}
-
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