9pfs: fix 'Twalk' protocol violation
Actual fix is patch 5, whereas patch 4 being preparatory, all other patches are test cases to guard this Twalk issue. -----BEGIN PGP SIGNATURE----- iQJLBAABCgA1FiEEltjREM96+AhPiFkBNMK1h2Wkc5UFAmKrDSAXHHFlbXVfb3Nz QGNydWRlYnl0ZS5jb20ACgkQNMK1h2Wkc5VgoQ//bA/lXYa6hds4f73+opq7iiJ/ 88gnJO8uPctNWXJ5f6ufXcTFtC99QRcl97jgSQhSIUdaZCfcpg7Pq3fONc060cMt MNxi5Da31Fq7xz4UhSQHgWlgAfomfClYoBSOtrrxjVbXChA2rB7FXhD9aewimUtt TlolXdJuPbGR3F6H0glN1itij12Ay5c0DMqFPy5npYlzjNhxmPb8QgFZ8E+lxhcT hG+OMmS9O5Mk7WKYWC1Iij7tWm45RbThPEUsfCPt6jIJYQqheOQs0ohJG9wyCZu3 JUCgSBPG1nNY0hgBJ/X7un7e89BoRw8edwqP+sSigfDf+LquUggqRFgz+joTbfvj Prq+1NTDIckDRZF6CDUSkZE3+Gq3qlIhw/2vS+bjYZrk04lP4x8d9JYPSkT3i8xc +YT/apDUkT68FjJ6PudfS2j6xRtYt86nOuWuhYukTZ2z5FJ0c9XAJlJX2ZS9Az3n AqKFCT+8UE4VYKnAJ61xDdqvAdEmKJUi5YutfuwH+j6sS4peLX0gg8mGlNi7y8JK bsqNjE1ve8rkp24DuUoHmivs/m1ogJi9Jxp5IjB4d26MPhgojrxOpaYUVg98QS7d os2ES47CSn4KFxqsFMZnZpgzKxIvRQ4C9bBbSClDOffHWHRJub6PCw5F9eCTH4dO z/QPJ+smDY7bolF+gSg= =3ejn -----END PGP SIGNATURE----- Merge tag 'pull-9p-20220616' of https://github.com/cschoenebeck/qemu into staging 9pfs: fix 'Twalk' protocol violation Actual fix is patch 5, whereas patch 4 being preparatory, all other patches are test cases to guard this Twalk issue. # -----BEGIN PGP SIGNATURE----- # # iQJLBAABCgA1FiEEltjREM96+AhPiFkBNMK1h2Wkc5UFAmKrDSAXHHFlbXVfb3Nz # QGNydWRlYnl0ZS5jb20ACgkQNMK1h2Wkc5VgoQ//bA/lXYa6hds4f73+opq7iiJ/ # 88gnJO8uPctNWXJ5f6ufXcTFtC99QRcl97jgSQhSIUdaZCfcpg7Pq3fONc060cMt # MNxi5Da31Fq7xz4UhSQHgWlgAfomfClYoBSOtrrxjVbXChA2rB7FXhD9aewimUtt # TlolXdJuPbGR3F6H0glN1itij12Ay5c0DMqFPy5npYlzjNhxmPb8QgFZ8E+lxhcT # hG+OMmS9O5Mk7WKYWC1Iij7tWm45RbThPEUsfCPt6jIJYQqheOQs0ohJG9wyCZu3 # JUCgSBPG1nNY0hgBJ/X7un7e89BoRw8edwqP+sSigfDf+LquUggqRFgz+joTbfvj # Prq+1NTDIckDRZF6CDUSkZE3+Gq3qlIhw/2vS+bjYZrk04lP4x8d9JYPSkT3i8xc # +YT/apDUkT68FjJ6PudfS2j6xRtYt86nOuWuhYukTZ2z5FJ0c9XAJlJX2ZS9Az3n # AqKFCT+8UE4VYKnAJ61xDdqvAdEmKJUi5YutfuwH+j6sS4peLX0gg8mGlNi7y8JK # bsqNjE1ve8rkp24DuUoHmivs/m1ogJi9Jxp5IjB4d26MPhgojrxOpaYUVg98QS7d # os2ES47CSn4KFxqsFMZnZpgzKxIvRQ4C9bBbSClDOffHWHRJub6PCw5F9eCTH4dO # z/QPJ+smDY7bolF+gSg= # =3ejn # -----END PGP SIGNATURE----- # gpg: Signature made Thu 16 Jun 2022 03:59:44 AM PDT # gpg: using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395 # gpg: issuer "qemu_oss@crudebyte.com" # gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.com>" [unknown] # gpg: WARNING: This key is not certified with a trusted signature! # gpg: There is no indication that the signature belongs to the owner. # Primary key fingerprint: ECAB 1A45 4014 1413 BA38 4926 30DB 47C3 A012 D5F4 # Subkey fingerprint: 96D8 D110 CF7A F808 4F88 5901 34C2 B587 65A4 7395 * tag 'pull-9p-20220616' of https://github.com/cschoenebeck/qemu: tests/9pfs: check fid being unaffected in fs_walk_2nd_nonexistent tests/9pfs: guard recent 'Twalk' behaviour fix 9pfs: fix 'Twalk' to only send error if no component walked 9pfs: refactor 'name_idx' -> 'nwalked' in v9fs_walk() tests/9pfs: compare QIDs in fs_walk_none() test tests/9pfs: Twalk with nwname=0 tests/9pfs: walk to non-existent dir Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
commit
213fda642d
63
hw/9pfs/9p.c
63
hw/9pfs/9p.c
@ -1766,9 +1766,9 @@ static bool same_stat_id(const struct stat *a, const struct stat *b)
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static void coroutine_fn v9fs_walk(void *opaque)
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{
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int name_idx;
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int name_idx, nwalked;
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g_autofree V9fsQID *qids = NULL;
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int i, err = 0;
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int i, err = 0, any_err = 0;
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V9fsPath dpath, path;
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P9ARRAY_REF(V9fsPath) pathes = NULL;
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uint16_t nwnames;
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@ -1834,54 +1834,61 @@ static void coroutine_fn v9fs_walk(void *opaque)
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* driver code altogether inside the following block.
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*/
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v9fs_co_run_in_worker({
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nwalked = 0;
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if (v9fs_request_cancelled(pdu)) {
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err = -EINTR;
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any_err |= err = -EINTR;
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break;
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}
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err = s->ops->lstat(&s->ctx, &dpath, &fidst);
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if (err < 0) {
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err = -errno;
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any_err |= err = -errno;
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break;
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}
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stbuf = fidst;
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for (name_idx = 0; name_idx < nwnames; name_idx++) {
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for (; nwalked < nwnames; nwalked++) {
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if (v9fs_request_cancelled(pdu)) {
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err = -EINTR;
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any_err |= err = -EINTR;
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break;
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}
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if (!same_stat_id(&pdu->s->root_st, &stbuf) ||
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strcmp("..", wnames[name_idx].data))
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strcmp("..", wnames[nwalked].data))
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{
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err = s->ops->name_to_path(&s->ctx, &dpath,
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wnames[name_idx].data,
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&pathes[name_idx]);
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wnames[nwalked].data,
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&pathes[nwalked]);
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if (err < 0) {
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err = -errno;
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any_err |= err = -errno;
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break;
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}
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if (v9fs_request_cancelled(pdu)) {
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err = -EINTR;
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any_err |= err = -EINTR;
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break;
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}
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err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf);
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err = s->ops->lstat(&s->ctx, &pathes[nwalked], &stbuf);
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if (err < 0) {
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err = -errno;
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any_err |= err = -errno;
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break;
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}
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stbufs[name_idx] = stbuf;
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v9fs_path_copy(&dpath, &pathes[name_idx]);
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stbufs[nwalked] = stbuf;
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v9fs_path_copy(&dpath, &pathes[nwalked]);
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}
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}
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});
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/*
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* Handle all the rest of this Twalk request on main thread ...
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*
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* NOTE: -EINTR is an exception where we deviate from the protocol spec
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* and simply send a (R)Lerror response instead of bothering to assemble
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* a (deducted) Rwalk response; because -EINTR is always the result of a
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* Tflush request, so client would no longer wait for a response in this
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* case anyway.
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*/
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if (err < 0) {
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if ((err < 0 && !nwalked) || err == -EINTR) {
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goto out;
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}
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err = stat_to_qid(pdu, &fidst, &qid);
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if (err < 0) {
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any_err |= err = stat_to_qid(pdu, &fidst, &qid);
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if (err < 0 && !nwalked) {
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goto out;
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}
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stbuf = fidst;
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@ -1890,20 +1897,29 @@ static void coroutine_fn v9fs_walk(void *opaque)
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v9fs_path_copy(&dpath, &fidp->path);
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v9fs_path_copy(&path, &fidp->path);
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for (name_idx = 0; name_idx < nwnames; name_idx++) {
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for (name_idx = 0; name_idx < nwalked; name_idx++) {
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if (!same_stat_id(&pdu->s->root_st, &stbuf) ||
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strcmp("..", wnames[name_idx].data))
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{
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stbuf = stbufs[name_idx];
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err = stat_to_qid(pdu, &stbuf, &qid);
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any_err |= err = stat_to_qid(pdu, &stbuf, &qid);
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if (err < 0) {
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goto out;
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break;
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}
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v9fs_path_copy(&path, &pathes[name_idx]);
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v9fs_path_copy(&dpath, &path);
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}
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memcpy(&qids[name_idx], &qid, sizeof(qid));
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}
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if (any_err < 0) {
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if (!name_idx) {
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/* don't send any QIDs, send Rlerror instead */
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goto out;
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} else {
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/* send QIDs (not Rlerror), but fid MUST remain unaffected */
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goto send_qids;
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}
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}
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if (fid == newfid) {
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if (fidp->fid_type != P9_FID_NONE) {
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err = -EINVAL;
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@ -1921,8 +1937,9 @@ static void coroutine_fn v9fs_walk(void *opaque)
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newfidp->uid = fidp->uid;
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v9fs_path_copy(&newfidp->path, &path);
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}
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err = v9fs_walk_marshal(pdu, nwnames, qids);
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trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
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send_qids:
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err = v9fs_walk_marshal(pdu, name_idx, qids);
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trace_v9fs_walk_return(pdu->tag, pdu->id, name_idx, qids);
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out:
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put_fid(pdu, fidp);
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if (newfidp) {
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@ -371,8 +371,15 @@ static P9Req *v9fs_tattach(QVirtio9P *v9p, uint32_t fid, uint32_t n_uname,
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return req;
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}
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/* type[1] version[4] path[8] */
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typedef char v9fs_qid[13];
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static inline bool is_same_qid(v9fs_qid a, v9fs_qid b)
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{
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/* don't compare QID version for checking for file ID equalness */
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return a[0] == b[0] && memcmp(&a[5], &b[5], 8) == 0;
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}
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/* size[4] Rattach tag[2] qid[13] */
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static void v9fs_rattach(P9Req *req, v9fs_qid *qid)
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{
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@ -425,6 +432,79 @@ static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid)
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v9fs_req_free(req);
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}
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/* size[4] Tgetattr tag[2] fid[4] request_mask[8] */
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static P9Req *v9fs_tgetattr(QVirtio9P *v9p, uint32_t fid, uint64_t request_mask,
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uint16_t tag)
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{
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P9Req *req;
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req = v9fs_req_init(v9p, 4 + 8, P9_TGETATTR, tag);
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v9fs_uint32_write(req, fid);
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v9fs_uint64_write(req, request_mask);
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v9fs_req_send(req);
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return req;
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}
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typedef struct v9fs_attr {
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uint64_t valid;
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v9fs_qid qid;
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uint32_t mode;
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uint32_t uid;
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uint32_t gid;
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uint64_t nlink;
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uint64_t rdev;
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uint64_t size;
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uint64_t blksize;
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uint64_t blocks;
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uint64_t atime_sec;
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uint64_t atime_nsec;
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uint64_t mtime_sec;
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uint64_t mtime_nsec;
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uint64_t ctime_sec;
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uint64_t ctime_nsec;
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uint64_t btime_sec;
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uint64_t btime_nsec;
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uint64_t gen;
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uint64_t data_version;
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} v9fs_attr;
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#define P9_GETATTR_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
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/*
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* size[4] Rgetattr tag[2] valid[8] qid[13] mode[4] uid[4] gid[4] nlink[8]
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* rdev[8] size[8] blksize[8] blocks[8]
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* atime_sec[8] atime_nsec[8] mtime_sec[8] mtime_nsec[8]
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* ctime_sec[8] ctime_nsec[8] btime_sec[8] btime_nsec[8]
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* gen[8] data_version[8]
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*/
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static void v9fs_rgetattr(P9Req *req, v9fs_attr *attr)
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{
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v9fs_req_recv(req, P9_RGETATTR);
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v9fs_uint64_read(req, &attr->valid);
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v9fs_memread(req, &attr->qid, 13);
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v9fs_uint32_read(req, &attr->mode);
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v9fs_uint32_read(req, &attr->uid);
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v9fs_uint32_read(req, &attr->gid);
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v9fs_uint64_read(req, &attr->nlink);
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v9fs_uint64_read(req, &attr->rdev);
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v9fs_uint64_read(req, &attr->size);
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v9fs_uint64_read(req, &attr->blksize);
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v9fs_uint64_read(req, &attr->blocks);
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v9fs_uint64_read(req, &attr->atime_sec);
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v9fs_uint64_read(req, &attr->atime_nsec);
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v9fs_uint64_read(req, &attr->mtime_sec);
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v9fs_uint64_read(req, &attr->mtime_nsec);
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v9fs_uint64_read(req, &attr->ctime_sec);
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v9fs_uint64_read(req, &attr->ctime_nsec);
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v9fs_uint64_read(req, &attr->btime_sec);
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v9fs_uint64_read(req, &attr->btime_nsec);
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v9fs_uint64_read(req, &attr->gen);
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v9fs_uint64_read(req, &attr->data_version);
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v9fs_req_free(req);
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}
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/* size[4] Treaddir tag[2] fid[4] offset[8] count[4] */
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static P9Req *v9fs_treaddir(QVirtio9P *v9p, uint32_t fid, uint64_t offset,
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uint32_t count, uint16_t tag)
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@ -589,8 +669,12 @@ static void do_version(QVirtio9P *v9p)
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g_assert_cmpmem(server_version, server_len, version, strlen(version));
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}
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/* utility function: walk to requested dir and return fid for that dir */
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static uint32_t do_walk(QVirtio9P *v9p, const char *path)
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/*
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* utility function: walk to requested dir and return fid for that dir and
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* the QIDs of server response
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*/
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static uint32_t do_walk_rqids(QVirtio9P *v9p, const char *path, uint16_t *nwqid,
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v9fs_qid **wqid)
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{
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char **wnames;
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P9Req *req;
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@ -600,26 +684,56 @@ static uint32_t do_walk(QVirtio9P *v9p, const char *path)
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req = v9fs_twalk(v9p, 0, fid, nwnames, wnames, 0);
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v9fs_req_wait_for_reply(req, NULL);
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v9fs_rwalk(req, NULL, NULL);
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v9fs_rwalk(req, nwqid, wqid);
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split_free(&wnames);
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return fid;
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}
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/* utility function: walk to requested dir and return fid for that dir */
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static uint32_t do_walk(QVirtio9P *v9p, const char *path)
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{
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return do_walk_rqids(v9p, path, NULL, NULL);
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}
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/* utility function: walk to requested dir and expect passed error response */
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static void do_walk_expect_error(QVirtio9P *v9p, const char *path, uint32_t err)
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{
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char **wnames;
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P9Req *req;
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uint32_t _err;
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const uint32_t fid = genfid();
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int nwnames = split(path, "/", &wnames);
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req = v9fs_twalk(v9p, 0, fid, nwnames, wnames, 0);
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v9fs_req_wait_for_reply(req, NULL);
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v9fs_rlerror(req, &_err);
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g_assert_cmpint(_err, ==, err);
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split_free(&wnames);
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}
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static void fs_version(void *obj, void *data, QGuestAllocator *t_alloc)
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{
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alloc = t_alloc;
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do_version(obj);
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}
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static void do_attach(QVirtio9P *v9p)
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static void do_attach_rqid(QVirtio9P *v9p, v9fs_qid *qid)
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{
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P9Req *req;
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do_version(v9p);
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req = v9fs_tattach(v9p, 0, getuid(), 0);
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v9fs_req_wait_for_reply(req, NULL);
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v9fs_rattach(req, NULL);
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v9fs_rattach(req, qid);
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}
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static void do_attach(QVirtio9P *v9p)
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{
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do_attach_rqid(v9p, NULL);
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}
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static void fs_attach(void *obj, void *data, QGuestAllocator *t_alloc)
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@ -974,6 +1088,80 @@ static void fs_walk_no_slash(void *obj, void *data, QGuestAllocator *t_alloc)
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g_free(wnames[0]);
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}
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static void fs_walk_nonexistent(void *obj, void *data, QGuestAllocator *t_alloc)
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{
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QVirtio9P *v9p = obj;
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alloc = t_alloc;
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do_attach(v9p);
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/*
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* The 9p2000 protocol spec says: "If the first element cannot be walked
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* for any reason, Rerror is returned."
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*/
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do_walk_expect_error(v9p, "non-existent", ENOENT);
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}
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static void fs_walk_2nd_nonexistent(void *obj, void *data,
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QGuestAllocator *t_alloc)
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{
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QVirtio9P *v9p = obj;
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alloc = t_alloc;
|
||||
v9fs_qid root_qid;
|
||||
uint16_t nwqid;
|
||||
uint32_t fid, err;
|
||||
P9Req *req;
|
||||
g_autofree v9fs_qid *wqid = NULL;
|
||||
g_autofree char *path = g_strdup_printf(
|
||||
QTEST_V9FS_SYNTH_WALK_FILE "/non-existent", 0
|
||||
);
|
||||
|
||||
do_attach_rqid(v9p, &root_qid);
|
||||
fid = do_walk_rqids(v9p, path, &nwqid, &wqid);
|
||||
/*
|
||||
* The 9p2000 protocol spec says: "nwqid is therefore either nwname or the
|
||||
* index of the first elementwise walk that failed."
|
||||
*/
|
||||
assert(nwqid == 1);
|
||||
|
||||
/* returned QID wqid[0] is file ID of 1st subdir */
|
||||
g_assert(wqid && wqid[0] && !is_same_qid(root_qid, wqid[0]));
|
||||
|
||||
/* expect fid being unaffected by walk above */
|
||||
req = v9fs_tgetattr(v9p, fid, P9_GETATTR_BASIC, 0);
|
||||
v9fs_req_wait_for_reply(req, NULL);
|
||||
v9fs_rlerror(req, &err);
|
||||
|
||||
g_assert_cmpint(err, ==, ENOENT);
|
||||
}
|
||||
|
||||
static void fs_walk_none(void *obj, void *data, QGuestAllocator *t_alloc)
|
||||
{
|
||||
QVirtio9P *v9p = obj;
|
||||
alloc = t_alloc;
|
||||
v9fs_qid root_qid;
|
||||
g_autofree v9fs_qid *wqid = NULL;
|
||||
P9Req *req;
|
||||
struct v9fs_attr attr;
|
||||
|
||||
do_version(v9p);
|
||||
req = v9fs_tattach(v9p, 0, getuid(), 0);
|
||||
v9fs_req_wait_for_reply(req, NULL);
|
||||
v9fs_rattach(req, &root_qid);
|
||||
|
||||
req = v9fs_twalk(v9p, 0, 1, 0, NULL, 0);
|
||||
v9fs_req_wait_for_reply(req, NULL);
|
||||
v9fs_rwalk(req, NULL, &wqid);
|
||||
|
||||
/* special case: no QID is returned if nwname=0 was sent */
|
||||
g_assert(wqid == NULL);
|
||||
|
||||
req = v9fs_tgetattr(v9p, 1, P9_GETATTR_BASIC, 0);
|
||||
v9fs_req_wait_for_reply(req, NULL);
|
||||
v9fs_rgetattr(req, &attr);
|
||||
|
||||
g_assert(is_same_qid(root_qid, attr.qid));
|
||||
}
|
||||
|
||||
static void fs_walk_dotdot(void *obj, void *data, QGuestAllocator *t_alloc)
|
||||
{
|
||||
QVirtio9P *v9p = obj;
|
||||
@ -1407,8 +1595,13 @@ static void register_virtio_9p_test(void)
|
||||
qos_add_test("synth/walk/basic", "virtio-9p", fs_walk, &opts);
|
||||
qos_add_test("synth/walk/no_slash", "virtio-9p", fs_walk_no_slash,
|
||||
&opts);
|
||||
qos_add_test("synth/walk/none", "virtio-9p", fs_walk_none, &opts);
|
||||
qos_add_test("synth/walk/dotdot_from_root", "virtio-9p",
|
||||
fs_walk_dotdot, &opts);
|
||||
qos_add_test("synth/walk/non_existent", "virtio-9p", fs_walk_nonexistent,
|
||||
&opts);
|
||||
qos_add_test("synth/walk/2nd_non_existent", "virtio-9p",
|
||||
fs_walk_2nd_nonexistent, &opts);
|
||||
qos_add_test("synth/lopen/basic", "virtio-9p", fs_lopen, &opts);
|
||||
qos_add_test("synth/write/basic", "virtio-9p", fs_write, &opts);
|
||||
qos_add_test("synth/flush/success", "virtio-9p", fs_flush_success,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user