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authorChris Mason <clm@fb.com>2015-02-19 17:51:39 -0800
committerChris Mason <clm@fb.com>2015-02-20 06:55:15 -0800
commite57cf21e9787c081db4db6afa02e6e70112ee410 (patch)
tree7adfc0eb69debac66a20028a8a90f2a3b72f13c4 /fs
parenta742994aa2e271eb8cd8e043d276515ec858ed73 (diff)
Btrfs: fix allocation size calculations in alloc_btrfs_bio
Since commit 8e5cfb55d3f (Btrfs: Make raid_map array be inlined in btrfs_bio structure), the raid map array is allocated along with the btrfs bio in alloc_btrfs_bio. The calculation used to decide how much we need to allocate was using the wrong parameter passed into the allocation function. The passed in real_stripes will be zero if a target replace operation is not currently running. We want to use total_stripes instead. Signed-off-by: Chris Mason <clm@fb.com> Reported-by: David Sterba <dsterba@suse.cz> Tested-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/volumes.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index cd4d1315aaa9..8222f6f74147 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4903,10 +4903,17 @@ static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes)
static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes)
{
struct btrfs_bio *bbio = kzalloc(
+ /* the size of the btrfs_bio */
sizeof(struct btrfs_bio) +
+ /* plus the variable array for the stripes */
sizeof(struct btrfs_bio_stripe) * (total_stripes) +
+ /* plus the variable array for the tgt dev */
sizeof(int) * (real_stripes) +
- sizeof(u64) * (real_stripes),
+ /*
+ * plus the raid_map, which includes both the tgt dev
+ * and the stripes
+ */
+ sizeof(u64) * (total_stripes),
GFP_NOFS);
if (!bbio)
return NULL;