Synopsis size[4] TReadlink tag[2] fid[4] size[4] RReadlink tag[2] target[s]
Description Readlink is used to return the contents of the symoblic link referred by fid. Contents of symboic link is returned as a response. target[s] - Contents of the symbolic link referred by fid. Signed-off-by: M. Mohan Kumar <mo...@in.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> --- hw/virtio-9p-debug.c | 8 ++++++++ hw/virtio-9p.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ hw/virtio-9p.h | 9 +++++++++ 3 files changed, 61 insertions(+), 0 deletions(-) diff --git a/hw/virtio-9p-debug.c b/hw/virtio-9p-debug.c index 6f6a0ec..cfaae6b 100644 --- a/hw/virtio-9p-debug.c +++ b/hw/virtio-9p-debug.c @@ -502,6 +502,14 @@ void pprint_pdu(V9fsPDU *pdu) fprintf(llogfile, "RMKNOD: )"); pprint_qid(pdu, 0, &offset, "qid"); break; + case P9_TREADLINK: + fprintf(llogfile, "TREADLINK: ("); + pprint_int32(pdu, 0, &offset, "fid"); + break; + case P9_RREADLINK: + fprintf(llogfile, "RREADLINK: ("); + pprint_str(pdu, 0, &offset, "target"); + break; case P9_TREAD: fprintf(llogfile, "TREAD: ("); pprint_int32(pdu, 0, &offset, "fid"); diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index fd2147e..5d1fbee 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -3403,6 +3403,49 @@ out: qemu_free(vs); } +static void v9fs_readlink_post_readlink(V9fsState *s, V9fsReadLinkState *vs, + int err) +{ + if (err < 0) { + err = -errno; + goto out; + } + vs->offset += pdu_marshal(vs->pdu, vs->offset, "s", &vs->target); + err = vs->offset; +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->target); + qemu_free(vs); +} + +static void v9fs_readlink(V9fsState *s, V9fsPDU *pdu) +{ + int32_t fid; + V9fsReadLinkState *vs; + int err = 0; + V9fsFidState *fidp; + + vs = qemu_malloc(sizeof(*vs)); + vs->pdu = pdu; + vs->offset = 7; + + pdu_unmarshal(vs->pdu, vs->offset, "d", &fid); + + fidp = lookup_fid(s, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out; + } + + v9fs_string_init(&vs->target); + err = v9fs_do_readlink(s, &fidp->path, &vs->target); + v9fs_readlink_post_readlink(s, vs, err); + return; +out: + complete_pdu(s, vs->pdu, err); + qemu_free(vs); +} + typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); static pdu_handler_t *pdu_handlers[] = { @@ -3414,6 +3457,7 @@ static pdu_handler_t *pdu_handlers[] = { [P9_TXATTRCREATE] = v9fs_xattrcreate, [P9_TMKNOD] = v9fs_mknod, [P9_TRENAME] = v9fs_rename, + [P9_TREADLINK] = v9fs_readlink, [P9_TMKDIR] = v9fs_mkdir, [P9_TVERSION] = v9fs_version, [P9_TLOPEN] = v9fs_open, diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h index 0816ad6..bbc23d5 100644 --- a/hw/virtio-9p.h +++ b/hw/virtio-9p.h @@ -27,6 +27,8 @@ enum { P9_RMKNOD, P9_TRENAME = 20, P9_RRENAME, + P9_TREADLINK = 22, + P9_RREADLINK, P9_TGETATTR = 24, P9_RGETATTR, P9_TSETATTR = 26, @@ -434,6 +436,13 @@ typedef struct V9fsXattrState void *value; } V9fsXattrState; +typedef struct V9fsReadLinkState +{ + V9fsPDU *pdu; + size_t offset; + V9fsString target; +} V9fsReadLinkState; + extern size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, size_t offset, size_t size, int pack); -- 1.7.0.4