[PATCH] md: Infrastructure to allow normal IO to continue while array is expanding

[powerpc.git] / drivers / md / dm-ioctl.c

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 442e2be..8edd643 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/devfs_fs_kernel.h>
 #include <linux/dm-ioctl.h>
+#include <linux/hdreg.h>
 
 #include <asm/uaccess.h>
 
@@ -244,9 +245,9 @@ static void __hash_remove(struct hash_cell *hc)
                dm_table_put(table);
        }
 
-       dm_put(hc->md);
        if (hc->new_map)
                dm_table_put(hc->new_map);
+       dm_put(hc->md);
        free_cell(hc);
 }
 
@@ -600,12 +601,22 @@ static int dev_create(struct dm_ioctl *param, size_t param_size)
  */
 static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
 {
+       struct mapped_device *md;
+       void *mdptr = NULL;
+
        if (*param->uuid)
                return __get_uuid_cell(param->uuid);
-       else if (*param->name)
+
+       if (*param->name)
                return __get_name_cell(param->name);
-       else
-               return dm_get_mdptr(huge_decode_dev(param->dev));
+
+       md = dm_get_md(huge_decode_dev(param->dev));
+       if (md) {
+               mdptr = dm_get_mdptr(md);
+               dm_put(md);
+       }
+
+       return mdptr;
 }
 
 static struct mapped_device *find_device(struct dm_ioctl *param)
@@ -690,6 +701,54 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
        return dm_hash_rename(param->name, new_name);
 }
 
+static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
+{
+       int r = -EINVAL, x;
+       struct mapped_device *md;
+       struct hd_geometry geometry;
+       unsigned long indata[4];
+       char *geostr = (char *) param + param->data_start;
+
+       md = find_device(param);
+       if (!md)
+               return -ENXIO;
+
+       if (geostr < (char *) (param + 1) ||
+           invalid_str(geostr, (void *) param + param_size)) {
+               DMWARN("Invalid geometry supplied.");
+               goto out;
+       }
+
+       x = sscanf(geostr, "%lu %lu %lu %lu", indata,
+                  indata + 1, indata + 2, indata + 3);
+
+       if (x != 4) {
+               DMWARN("Unable to interpret geometry settings.");
+               goto out;
+       }
+
+       if (indata[0] > 65535 || indata[1] > 255 ||
+           indata[2] > 255 || indata[3] > ULONG_MAX) {
+               DMWARN("Geometry exceeds range limits.");
+               goto out;
+       }
+
+       geometry.cylinders = indata[0];
+       geometry.heads = indata[1];
+       geometry.sectors = indata[2];
+       geometry.start = indata[3];
+
+       r = dm_set_geometry(md, &geometry);
+       if (!r)
+               r = __dev_status(md, param);
+
+       param->data_size = 0;
+
+out:
+       dm_put(md);
+       return r;
+}
+
 static int do_suspend(struct dm_ioctl *param)
 {
        int r = 0;
@@ -975,33 +1034,43 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
        int r;
        struct hash_cell *hc;
        struct dm_table *t;
+       struct mapped_device *md;
 
-       r = dm_table_create(&t, get_mode(param), param->target_count);
+       md = find_device(param);
+       if (!md)
+               return -ENXIO;
+
+       r = dm_table_create(&t, get_mode(param), param->target_count, md);
        if (r)
-               return r;
+               goto out;
 
        r = populate_table(t, param, param_size);
        if (r) {
                dm_table_put(t);
-               return r;
+               goto out;
        }
 
        down_write(&_hash_lock);
-       hc = __find_device_hash_cell(param);
-       if (!hc) {
-               DMWARN("device doesn't appear to be in the dev hash table.");
-               up_write(&_hash_lock);
+       hc = dm_get_mdptr(md);
+       if (!hc || hc->md != md) {
+               DMWARN("device has been removed from the dev hash table.");
                dm_table_put(t);
-               return -ENXIO;
+               up_write(&_hash_lock);
+               r = -ENXIO;
+               goto out;
        }
 
        if (hc->new_map)
                dm_table_put(hc->new_map);
        hc->new_map = t;
+       up_write(&_hash_lock);
+
        param->flags |= DM_INACTIVE_PRESENT_FLAG;
+       r = __dev_status(md, param);
+
+out:
+       dm_put(md);
 
-       r = __dev_status(hc->md, param);
-       up_write(&_hash_lock);
        return r;
 }
 
@@ -1214,7 +1283,8 @@ static ioctl_fn lookup_ioctl(unsigned int cmd)
 
                {DM_LIST_VERSIONS_CMD, list_versions},
 
-               {DM_TARGET_MSG_CMD, target_message}
+               {DM_TARGET_MSG_CMD, target_message},
+               {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry}
        };
 
        return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn;