On 14/2/16 14:01, Aneesh Kumar K.V wrote:
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c index f972731..385c01d 100644 --- a/hw/9pfs/virtio-9p.c +++ b/hw/9pfs/virtio-9p.c @@ -1326,7 +1326,7 @@ out_nofid: static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path) { struct statfs stbuf; - int32_t iounit = 0; + int32_t iounit = 0, unit = 0; V9fsState *s = pdu->s; /* @@ -1334,8 +1334,21 @@ static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path) * and as well as less than (client msize - P9_IOHDRSZ)) */ if (!v9fs_co_statfs(pdu, path, &stbuf)) { - iounit = stbuf.f_bsize; - iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize; + /* + * If host filesystem block size is larger than client msize, + * we will use AGESIZE as the unit. The reason why we choose + * AGESIZE is because the data will be splitted in terms of + * AGESIZE in the virtio layer. In this case, the final + * iounit is equal to the value of ((msize/unit) - 1) * unit. + */ + if (stbuf.f_bsize > s->msize) { + iounit = 4096; + unit = 4096; + } else { + iounit = stbuf.f_bsize; + unit = stbuf.f_bsize; + } + iounit *= (s->msize - P9_IOHDRSZ)/unit; } if (!iounit) { iounit = s->msize - P9_IOHDRSZ; --Can you split this out as a separate patch ?. Also explain what is AGESIZE.
Sure thing. "AGESIZE" is supposed to be "PAGESIZE". Thanks, Jevon
-aneesh
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