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

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: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 21e2a7b08841..d1cb45f6d6a9 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1792,7 +1792,8 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
                 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_t newdev, int super_format, int super_mi
 
         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 *mddev, int raid_disks);
 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 char *buf, size_t len)
                 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)
@@ -3980,6 +3981,7 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
                 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;
@@ -4304,9 +4306,10 @@ static int md_ioctl(struct inode *inode, struct file *file,
          * 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;
         }