提交 24da24de 编写于 作者: T Tom Zanussi 提交者: Jens Axboe

relay: fix bogus cast in subbuf_splice_actor()

The current code that sets the read position in subbuf_splice_actor may
give erroneous results if the buffer size isn't a power of 2.  This
patch fixes the problem.
Signed-off-by: NTom Zanussi <zanussi@us.ibm.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
上级 77320894
...@@ -1074,7 +1074,9 @@ static int subbuf_splice_actor(struct file *in, ...@@ -1074,7 +1074,9 @@ static int subbuf_splice_actor(struct file *in,
unsigned int pidx, poff, total_len, subbuf_pages, ret; unsigned int pidx, poff, total_len, subbuf_pages, ret;
struct rchan_buf *rbuf = in->private_data; struct rchan_buf *rbuf = in->private_data;
unsigned int subbuf_size = rbuf->chan->subbuf_size; unsigned int subbuf_size = rbuf->chan->subbuf_size;
size_t read_start = ((size_t)*ppos) % rbuf->chan->alloc_size; uint64_t pos = (uint64_t) *ppos;
uint32_t alloc_size = (uint32_t) rbuf->chan->alloc_size;
size_t read_start = (size_t) do_div(pos, alloc_size);
size_t read_subbuf = read_start / subbuf_size; size_t read_subbuf = read_start / subbuf_size;
size_t padding = rbuf->padding[read_subbuf]; size_t padding = rbuf->padding[read_subbuf];
size_t nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding; size_t nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding;
......
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