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xen/blkback: Move the check for misaligned I/O higher. 

We move it up higher to be in same loop that actually computes
the sector number.

This way, all of the code that deals with verifying that the
request is correct is all done before we do any of the
page mapping, I/O submission, etc.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2011-04-15 11:38:29 -04:00
parent 1a95fe6e42
commit 976222e05e
1 changed files with 7 additions and 7 deletions
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14
drivers/xen/blkback/blkback.c
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@ -521,6 +521,13 @@ static void dispatch_rw_block_io(struct blkif_st *blkif,
(req->u.rw.seg[i].last_sect < req->u.rw.seg[i].first_sect))
goto fail_response;
preq.nr_sects += seg[i].nsec;
if (((int)preq.sector_number|(int)seg[i].nsec) &
((bdev_logical_block_size(preq.bdev) >> 9) - 1)) {
DPRINTK("Misaligned I/O request from domain %d",
blkif->domid);
goto fail_response;
}
}
if (vbd_translate(&preq, blkif, operation) != 0) {
@ -542,13 +549,6 @@ static void dispatch_rw_block_io(struct blkif_st *blkif,
blkif_get(blkif);
for (i = 0; i < nseg; i++) {
if (((int)preq.sector_number|(int)seg[i].nsec) &
((bdev_logical_block_size(preq.bdev) >> 9) - 1)) {
DPRINTK("Misaligned I/O request from domain %d",
blkif->domid);
goto fail_put_bio;
}
while ((bio == NULL) ||
(bio_add_page(bio,
blkbk->pending_page(pending_req, i),