[patch 40/59] md: fix a few problems with the interface (sysfs and ioctl) to md.

Chris Wright
2007-02-03T02:39:51Z

[-- Attachment #1: md-fix-a-few-problems-with-the-interface-to-md.patch --]
[-- Type: text/plain, Size: 3044 bytes --]

-stable review patch. If anyone has any objections, please let us know.
------------------

From: NeilBrown <neilb@suse.de>

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@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
drivers/md/md.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

--- linux-2.6.19.2.orig/drivers/md/md.c
+++ linux-2.6.19.2/drivers/md/md.c
@@ -1792,7 +1792,8 @@ 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;
}
@@ -2004,6 +2005,7 @@ 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;
@@ -2233,7 +2235,6 @@ 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);
@@ -2631,7 +2632,7 @@ 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)
@@ -3978,6 +3979,7 @@ 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;
@@ -4302,9 +4304,10 @@ 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;
}

--