hw/9pfs: Update v9fs_walk to use coroutines
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V
parent
d8e0c29e40
commit
3cc19c0c60
@ -1327,171 +1327,101 @@ out:
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complete_pdu(s, pdu, err);
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}
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static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
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{
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complete_pdu(s, vs->pdu, err);
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if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
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for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
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v9fs_string_free(&vs->wnames[vs->name_idx]);
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}
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g_free(vs->wnames);
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g_free(vs->qids);
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}
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}
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static void v9fs_walk_marshal(V9fsWalkState *vs)
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static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
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{
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int i;
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vs->offset = 7;
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
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for (i = 0; i < vs->nwnames; i++) {
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
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size_t offset = 7;
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offset += pdu_marshal(pdu, offset, "w", nwnames);
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for (i = 0; i < nwnames; i++) {
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offset += pdu_marshal(pdu, offset, "Q", &qids[i]);
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}
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}
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static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
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int err)
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{
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if (err == -1) {
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free_fid(s, vs->newfidp->fid);
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v9fs_string_free(&vs->path);
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err = -ENOENT;
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goto out;
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}
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stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
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vs->name_idx++;
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if (vs->name_idx < vs->nwnames) {
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v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
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vs->wnames[vs->name_idx].data);
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v9fs_string_copy(&vs->newfidp->path, &vs->path);
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err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
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v9fs_walk_post_newfid_lstat(s, vs, err);
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return;
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}
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v9fs_string_free(&vs->path);
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v9fs_walk_marshal(vs);
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err = vs->offset;
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out:
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v9fs_walk_complete(s, vs, err);
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}
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static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
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int err)
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{
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if (err == -1) {
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v9fs_string_free(&vs->path);
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err = -ENOENT;
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goto out;
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}
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stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
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vs->name_idx++;
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if (vs->name_idx < vs->nwnames) {
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v9fs_string_sprintf(&vs->path, "%s/%s",
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vs->fidp->path.data, vs->wnames[vs->name_idx].data);
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v9fs_string_copy(&vs->fidp->path, &vs->path);
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err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
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v9fs_walk_post_oldfid_lstat(s, vs, err);
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return;
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}
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v9fs_string_free(&vs->path);
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v9fs_walk_marshal(vs);
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err = vs->offset;
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out:
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v9fs_walk_complete(s, vs, err);
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return offset;
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}
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static void v9fs_walk(void *opaque)
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{
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int name_idx;
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V9fsQID *qids = NULL;
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int i, err = 0;
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V9fsString path;
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uint16_t nwnames;
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struct stat stbuf;
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size_t offset = 7;
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int32_t fid, newfid;
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V9fsString *wnames = NULL;
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V9fsFidState *fidp;
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V9fsFidState *newfidp;
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V9fsPDU *pdu = opaque;
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V9fsState *s = pdu->s;
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int32_t fid, newfid;
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V9fsWalkState *vs;
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int err = 0;
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int i;
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vs = g_malloc(sizeof(*vs));
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vs->pdu = pdu;
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vs->wnames = NULL;
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vs->qids = NULL;
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vs->offset = 7;
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offset += pdu_unmarshal(pdu, offset, "ddw", &fid,
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&newfid, &nwnames);
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vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
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&newfid, &vs->nwnames);
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if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
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vs->wnames = g_malloc0(sizeof(vs->wnames[0]) * vs->nwnames);
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vs->qids = g_malloc0(sizeof(vs->qids[0]) * vs->nwnames);
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for (i = 0; i < vs->nwnames; i++) {
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vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
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&vs->wnames[i]);
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if (nwnames && nwnames <= P9_MAXWELEM) {
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wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
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qids = g_malloc0(sizeof(qids[0]) * nwnames);
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for (i = 0; i < nwnames; i++) {
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offset += pdu_unmarshal(pdu, offset, "s", &wnames[i]);
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}
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} else if (vs->nwnames > P9_MAXWELEM) {
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} else if (nwnames > P9_MAXWELEM) {
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err = -EINVAL;
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goto out;
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}
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vs->fidp = lookup_fid(s, fid);
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if (vs->fidp == NULL) {
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fidp = lookup_fid(s, fid);
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if (fidp == NULL) {
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err = -ENOENT;
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goto out;
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}
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/* FIXME: is this really valid? */
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if (fid == newfid) {
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BUG_ON(fidp->fid_type != P9_FID_NONE);
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v9fs_string_init(&path);
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for (name_idx = 0; name_idx < nwnames; name_idx++) {
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v9fs_string_sprintf(&path, "%s/%s",
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fidp->path.data, wnames[name_idx].data);
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v9fs_string_copy(&fidp->path, &path);
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BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
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v9fs_string_init(&vs->path);
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vs->name_idx = 0;
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if (vs->name_idx < vs->nwnames) {
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v9fs_string_sprintf(&vs->path, "%s/%s",
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vs->fidp->path.data, vs->wnames[vs->name_idx].data);
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v9fs_string_copy(&vs->fidp->path, &vs->path);
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err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
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v9fs_walk_post_oldfid_lstat(s, vs, err);
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return;
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err = v9fs_co_lstat(s, &fidp->path, &stbuf);
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if (err < 0) {
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v9fs_string_free(&path);
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goto out;
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}
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stat_to_qid(&stbuf, &qids[name_idx]);
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}
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v9fs_string_free(&path);
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} else {
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vs->newfidp = alloc_fid(s, newfid);
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if (vs->newfidp == NULL) {
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newfidp = alloc_fid(s, newfid);
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if (newfidp == NULL) {
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err = -EINVAL;
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goto out;
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}
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vs->newfidp->uid = vs->fidp->uid;
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v9fs_string_init(&vs->path);
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vs->name_idx = 0;
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v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
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if (vs->name_idx < vs->nwnames) {
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v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
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vs->wnames[vs->name_idx].data);
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v9fs_string_copy(&vs->newfidp->path, &vs->path);
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err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
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v9fs_walk_post_newfid_lstat(s, vs, err);
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return;
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newfidp->uid = fidp->uid;
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v9fs_string_init(&path);
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v9fs_string_copy(&newfidp->path, &fidp->path);
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for (name_idx = 0; name_idx < nwnames; name_idx++) {
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v9fs_string_sprintf(&path, "%s/%s", newfidp->path.data,
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wnames[name_idx].data);
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v9fs_string_copy(&newfidp->path, &path);
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err = v9fs_co_lstat(s, &newfidp->path, &stbuf);
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if (err < 0) {
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free_fid(s, newfidp->fid);
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v9fs_string_free(&path);
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goto out;
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}
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stat_to_qid(&stbuf, &qids[name_idx]);
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}
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v9fs_string_free(&path);
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}
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v9fs_walk_marshal(vs);
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err = vs->offset;
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err = v9fs_walk_marshal(pdu, nwnames, qids);
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out:
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v9fs_walk_complete(s, vs, err);
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complete_pdu(s, pdu, err);
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if (nwnames && nwnames <= P9_MAXWELEM) {
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for (name_idx = 0; name_idx < nwnames; name_idx++) {
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v9fs_string_free(&wnames[name_idx]);
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}
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g_free(wnames);
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g_free(qids);
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}
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}
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static int32_t get_iounit(V9fsState *s, V9fsString *name)
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@ -267,19 +267,6 @@ typedef struct V9fsStatDotl {
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uint64_t st_data_version;
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} V9fsStatDotl;
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typedef struct V9fsWalkState {
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V9fsPDU *pdu;
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size_t offset;
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uint16_t nwnames;
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int name_idx;
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V9fsQID *qids;
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V9fsFidState *fidp;
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V9fsFidState *newfidp;
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V9fsString path;
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V9fsString *wnames;
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struct stat stbuf;
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} V9fsWalkState;
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typedef struct V9fsOpenState {
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V9fsPDU *pdu;
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size_t offset;
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