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Next: [PATCH 2/2] dm: export a table+mapped device to the ioctl interface
From: Will Drewry on 24 May 2010 12:40
This patchset breaks up the patch linked below:
https://patchwork.kernel.org/patch/101026/

This change unifies the various checks and finalization that occurs on a
table prior to use. By doing so, it allows table construction without
traversing the dm-ioctl interface.

Signed-off-by: Will Drewry <wad(a)chromium.org>
---
drivers/md/dm-ioctl.c | 34 ---------------------------------
drivers/md/dm-table.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 49 insertions(+), 35 deletions(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index d7500e1..dfde391 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1112,28 +1112,9 @@ static int populate_table(struct dm_table *table,
next = spec->next;
}

- r = dm_table_set_type(table);
- if (r) {
- DMWARN("unable to set table type");
- return r;
- }
-
return dm_table_complete(table);
}

-static int table_prealloc_integrity(struct dm_table *t,
- struct mapped_device *md)
-{
- struct list_head *devices = dm_table_get_devices(t);
- struct dm_dev_internal *dd;
-
- list_for_each_entry(dd, devices, list)
- if (bdev_get_integrity(dd->dm_dev.bdev))
- return blk_integrity_register(dm_disk(md), NULL);
-
- return 0;
-}
-
static int table_load(struct dm_ioctl *param, size_t param_size)
{
int r;
@@ -1155,21 +1136,6 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
goto out;
}

- r = table_prealloc_integrity(t, md);
- if (r) {
- DMERR("%s: could not register integrity profile.",
- dm_device_name(md));
- dm_table_destroy(t);
- goto out;
- }
-
- r = dm_table_alloc_md_mempools(t);
- if (r) {
- DMWARN("unable to allocate mempools for this table");
- dm_table_destroy(t);
- goto out;
- }
-
down_write(&_hash_lock);
hc = dm_get_mdptr(md);
if (!hc || hc->md != md) {
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 9924ea2..ef6a3ab 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -900,7 +900,7 @@ static int setup_indexes(struct dm_table *t)
/*
* Builds the btree to index the map.
*/
-int dm_table_complete(struct dm_table *t)
+int dm_table_build_index(struct dm_table *t)
{
int r = 0;
unsigned int leaf_nodes;
@@ -919,6 +919,54 @@ int dm_table_complete(struct dm_table *t)
return r;
}

+/*
+ * Register the mapped device for blk_integrity support if
+ * the underlying devices support it.
+ */
+static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device *md)
+{
+ struct list_head *devices = dm_table_get_devices(t);
+ struct dm_dev_internal *dd;
+
+ list_for_each_entry(dd, devices, list)
+ if (bdev_get_integrity(dd->dm_dev.bdev))
+ return blk_integrity_register(dm_disk(md), NULL);
+
+ return 0;
+}
+
+/*
+ * Prepares the table for use by building the indices,
+ * setting the type, and allocating mempools.
+ */
+int dm_table_complete(struct dm_table *t)
+{
+ int r = 0;
+ r = dm_table_set_type(t);
+ if (r) {
+ DMERR("unable to set table type");
+ return r;
+ }
+
+ r = dm_table_build_index(t);
+ if (r) {
+ DMERR("unable to build btrees");
+ return r;
+ }
+
+ r = dm_table_prealloc_integrity(t, t->md);
+ if (r) {
+ DMERR("could not register integrity profile.");
+ return r;
+ }
+
+ r = dm_table_alloc_md_mempools(t);
+ if (r) {
+ DMERR("unable to allocate mempools");
+ }
+ return r;
+}
+
static DEFINE_MUTEX(_event_lock);
void dm_table_event_callback(struct dm_table *t,
void (*fn)(void *), void *context)
--
1.7.0.4

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Next: [PATCH 2/2] dm: export a table+mapped device to the ioctl interface