This is a note to let you know that I've just added the patch titled
dm space map common: make sure new space is used during extend
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-space-map-common-make-sure-new-space-is-used-during-extend.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 12c91a5c2d2a8e8cc40a9552313e1e7b0a2d9ee3 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@xxxxxxxxxx>
Date: Tue, 7 Jan 2014 15:47:59 +0000
Subject: dm space map common: make sure new space is used during extend
From: Joe Thornber <ejt@xxxxxxxxxx>
commit 12c91a5c2d2a8e8cc40a9552313e1e7b0a2d9ee3 upstream.
When extending a low level space map we should update nr_blocks at
the start so the new space is used for the index entries.
Otherwise extend can fail, e.g.: sm_metadata_extend call sequence
that fails:
-> sm_ll_extend
-> dm_tm_new_block -> dm_sm_new_block -> sm_bootstrap_new_block
=> returns -ENOSPC because smm->begin == smm->ll.nr_blocks
Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/persistent-data/dm-space-map-common.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -245,6 +245,10 @@ int sm_ll_extend(struct ll_disk *ll, dm_
return -EINVAL;
}
+ /*
+ * We need to set this before the dm_tm_new_block() call below.
+ */
+ ll->nr_blocks = nr_blocks;
for (i = old_blocks; i < blocks; i++) {
struct dm_block *b;
struct disk_index_entry idx;
@@ -252,6 +256,7 @@ int sm_ll_extend(struct ll_disk *ll, dm_
r = dm_tm_new_block(ll->tm, &dm_sm_bitmap_validator, &b);
if (r < 0)
return r;
+
idx.blocknr = cpu_to_le64(dm_block_location(b));
r = dm_tm_unlock(ll->tm, b);
@@ -266,7 +271,6 @@ int sm_ll_extend(struct ll_disk *ll, dm_
return r;
}
- ll->nr_blocks = nr_blocks;
return 0;
}
Patches currently in stable-queue which might be from ejt@xxxxxxxxxx are
queue-3.12/dm-thin-fix-discard-support-to-a-previously-shared-block.patch
queue-3.12/dm-space-map-metadata-fix-extending-the-space-map.patch
queue-3.12/dm-space-map-common-make-sure-new-space-is-used-during-extend.patch
queue-3.12/dm-thin-initialize-dm_thin_new_mapping-returned-by-get_next_mapping.patch
queue-3.12/dm-space-map-metadata-fix-bug-in-resizing-of-thin-metadata.patch
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