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authorMikulas Patocka <mpatocka@redhat.com>2009-12-10 23:51:58 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-12-10 23:51:58 +0000
commitf1e539874655ae9e74c1644fd54133b19f1b14e2 (patch)
tree72dd2956c3915a45984321c192964ce7a88dbe07 /drivers/md/dm-raid1.c
parent952b355760c196ec014dd0b6878f85a11496e3da (diff)
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dm io: remove extra bi_io_vec region hack
Remove the hack where we allocate an extra bi_io_vec to store additional private data. This hack prevents us from supporting barriers in dm-raid1 without first making another little block layer change. Instead of doing that, this patch eliminates the bi_io_vec abuse by storing the region number directly in the low bits of bi_private. We need to store two things for each bio, the pointer to the main io structure and, if parallel writes were requested, an index indicating which of these writes this bio belongs to. There can be at most BITS_PER_LONG regions - 32 or 64. The index (region number) was stored in the last (hidden) bio vector and the pointer to struct io was stored in bi_private. This patch now aligns "struct io" on BITS_PER_LONG bytes and stores the region number in the low BITS_PER_LONG bits of bi_private. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-raid1.c')
0 files changed, 0 insertions, 0 deletions
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