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Subject[PATCH v2 6/7] 9p: handle large aio read requests
Date
When an async read larger then msize-P9_IOHDRSZ is issued, do not limit
the read size to msize-P9_IOHDRSZ. Instead, keep sending read requests
from the completion function, until the original read is completed.

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
---
net/9p/client.c | 40 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index e69955d..8d2f8f7 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1609,14 +1609,52 @@ int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
count -= n;
}

- err = total;
req->kiocb->ki_pos += total;
+ req->completed += total;
+ req->file_offset += total;
+ req->page_offset += total;
+ err = req->completed;
+
+ if (req->tot_size - req->completed > 0 && total == req->rsize) {
+ struct p9_req_t *req2;
+ u64 rsize = req->tot_size - req->completed;
+
+ if (rsize > req->fid->iounit)
+ rsize = req->fid->iounit;
+ if (rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ req2 = p9_client_get_req(clnt, P9_TREAD, "dqd", req->fid->fid,
+ req->file_offset, rsize);
+ if (IS_ERR(req2)) {
+ err = PTR_ERR(req2);
+ goto out;
+ }
+ req2->fid = req->fid;
+ req2->rsize = rsize;
+ req2->tot_size = req->tot_size;
+ req2->completed = req->completed;
+ req2->file_offset = req->file_offset;
+ req2->page_offset = req->page_offset;
+ req2->kiocb = req->kiocb;
+ req2->pagevec = req->pagevec;
+ INIT_WORK(&req2->work, p9_client_read_complete);
+
+ err = clnt->trans_mod->request(clnt, req2);
+ if (err < 0) {
+ clnt->status = Disconnected;
+ p9_free_req(clnt, req2);
+ goto out;
+ }
+ goto out2;
+ }

out:
req->kiocb->ki_complete(req->kiocb, err, 0);

release_pages(req->pagevec, (req->tot_size + PAGE_SIZE - 1) / PAGE_SIZE, false);
kvfree(req->pagevec);
+out2:
p9_free_req(clnt, req);
}

--
1.9.1
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