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lightnvm: pblk: schedule if data is not ready

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When user threads place data into the write buffer, they reserve space
and do the memory copy out of the lock. As a consequence, when the write
thread starts persisting data, there is a chance that it is not copied
yet. In this case, avoid polling, and schedule before retrying.

Signed-off-by: Javier González <[email protected]>
Signed-off-by: Matias Bjørling <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Javier González 2017-06-30 17:56:37 +02:00 • committed by Jens Axboe
commit 1088812978
1 changed files with 3 additions and 1 deletions
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4
drivers/lightnvm/pblk-rb.c
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@ -578,8 +578,10 @@ unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
*/
try:
flags = READ_ONCE(entry->w_ctx.flags);
if (!(flags & PBLK_WRITTEN_DATA))
if (!(flags & PBLK_WRITTEN_DATA)) {
io_schedule();
goto try;
}
page = virt_to_page(entry->data);
if (!page) {