diff options
| -rw-r--r-- | hw/9pfs/9p.c | 63 | ||||
| -rw-r--r-- | tests/qtest/virtio-9p-test.c | 201 |
2 files changed, 237 insertions, 27 deletions
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index 0cd0c14c2a..aebadeaa03 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -1766,9 +1766,9 @@ static bool same_stat_id(const struct stat *a, const struct stat *b) static void coroutine_fn v9fs_walk(void *opaque) { - int name_idx; + int name_idx, nwalked; g_autofree V9fsQID *qids = NULL; - int i, err = 0; + int i, err = 0, any_err = 0; V9fsPath dpath, path; P9ARRAY_REF(V9fsPath) pathes = NULL; uint16_t nwnames; @@ -1834,54 +1834,61 @@ static void coroutine_fn v9fs_walk(void *opaque) * driver code altogether inside the following block. */ v9fs_co_run_in_worker({ + nwalked = 0; if (v9fs_request_cancelled(pdu)) { - err = -EINTR; + any_err |= err = -EINTR; break; } err = s->ops->lstat(&s->ctx, &dpath, &fidst); if (err < 0) { - err = -errno; + any_err |= err = -errno; break; } stbuf = fidst; - for (name_idx = 0; name_idx < nwnames; name_idx++) { + for (; nwalked < nwnames; nwalked++) { if (v9fs_request_cancelled(pdu)) { - err = -EINTR; + any_err |= err = -EINTR; break; } if (!same_stat_id(&pdu->s->root_st, &stbuf) || - strcmp("..", wnames[name_idx].data)) + strcmp("..", wnames[nwalked].data)) { err = s->ops->name_to_path(&s->ctx, &dpath, - wnames[name_idx].data, - &pathes[name_idx]); + wnames[nwalked].data, + &pathes[nwalked]); if (err < 0) { - err = -errno; + any_err |= err = -errno; break; } if (v9fs_request_cancelled(pdu)) { - err = -EINTR; + any_err |= err = -EINTR; break; } - err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); + err = s->ops->lstat(&s->ctx, &pathes[nwalked], &stbuf); if (err < 0) { - err = -errno; + any_err |= err = -errno; break; } - stbufs[name_idx] = stbuf; - v9fs_path_copy(&dpath, &pathes[name_idx]); + stbufs[nwalked] = stbuf; + v9fs_path_copy(&dpath, &pathes[nwalked]); } } }); /* * Handle all the rest of this Twalk request on main thread ... + * + * NOTE: -EINTR is an exception where we deviate from the protocol spec + * and simply send a (R)Lerror response instead of bothering to assemble + * a (deducted) Rwalk response; because -EINTR is always the result of a + * Tflush request, so client would no longer wait for a response in this + * case anyway. */ - if (err < 0) { + if ((err < 0 && !nwalked) || err == -EINTR) { goto out; } - err = stat_to_qid(pdu, &fidst, &qid); - if (err < 0) { + any_err |= err = stat_to_qid(pdu, &fidst, &qid); + if (err < 0 && !nwalked) { goto out; } stbuf = fidst; @@ -1890,20 +1897,29 @@ static void coroutine_fn v9fs_walk(void *opaque) v9fs_path_copy(&dpath, &fidp->path); v9fs_path_copy(&path, &fidp->path); - for (name_idx = 0; name_idx < nwnames; name_idx++) { + for (name_idx = 0; name_idx < nwalked; name_idx++) { if (!same_stat_id(&pdu->s->root_st, &stbuf) || strcmp("..", wnames[name_idx].data)) { stbuf = stbufs[name_idx]; - err = stat_to_qid(pdu, &stbuf, &qid); + any_err |= err = stat_to_qid(pdu, &stbuf, &qid); if (err < 0) { - goto out; + break; } v9fs_path_copy(&path, &pathes[name_idx]); v9fs_path_copy(&dpath, &path); } memcpy(&qids[name_idx], &qid, sizeof(qid)); } + if (any_err < 0) { + if (!name_idx) { + /* don't send any QIDs, send Rlerror instead */ + goto out; + } else { + /* send QIDs (not Rlerror), but fid MUST remain unaffected */ + goto send_qids; + } + } if (fid == newfid) { if (fidp->fid_type != P9_FID_NONE) { err = -EINVAL; @@ -1921,8 +1937,9 @@ static void coroutine_fn v9fs_walk(void *opaque) newfidp->uid = fidp->uid; v9fs_path_copy(&newfidp->path, &path); } - err = v9fs_walk_marshal(pdu, nwnames, qids); - trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); +send_qids: + err = v9fs_walk_marshal(pdu, name_idx, qids); + trace_v9fs_walk_return(pdu->tag, pdu->id, name_idx, qids); out: put_fid(pdu, fidp); if (newfidp) { diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c index e28c71bd8f..25305a4cf7 100644 --- a/tests/qtest/virtio-9p-test.c +++ b/tests/qtest/virtio-9p-test.c @@ -371,8 +371,15 @@ static P9Req *v9fs_tattach(QVirtio9P *v9p, uint32_t fid, uint32_t n_uname, return req; } +/* type[1] version[4] path[8] */ typedef char v9fs_qid[13]; +static inline bool is_same_qid(v9fs_qid a, v9fs_qid b) +{ + /* don't compare QID version for checking for file ID equalness */ + return a[0] == b[0] && memcmp(&a[5], &b[5], 8) == 0; +} + /* size[4] Rattach tag[2] qid[13] */ static void v9fs_rattach(P9Req *req, v9fs_qid *qid) { @@ -425,6 +432,79 @@ static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid) v9fs_req_free(req); } +/* size[4] Tgetattr tag[2] fid[4] request_mask[8] */ +static P9Req *v9fs_tgetattr(QVirtio9P *v9p, uint32_t fid, uint64_t request_mask, + uint16_t tag) +{ + P9Req *req; + + req = v9fs_req_init(v9p, 4 + 8, P9_TGETATTR, tag); + v9fs_uint32_write(req, fid); + v9fs_uint64_write(req, request_mask); + v9fs_req_send(req); + return req; +} + +typedef struct v9fs_attr { + uint64_t valid; + v9fs_qid qid; + uint32_t mode; + uint32_t uid; + uint32_t gid; + uint64_t nlink; + uint64_t rdev; + uint64_t size; + uint64_t blksize; + uint64_t blocks; + uint64_t atime_sec; + uint64_t atime_nsec; + uint64_t mtime_sec; + uint64_t mtime_nsec; + uint64_t ctime_sec; + uint64_t ctime_nsec; + uint64_t btime_sec; + uint64_t btime_nsec; + uint64_t gen; + uint64_t data_version; +} v9fs_attr; + +#define P9_GETATTR_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ + +/* + * size[4] Rgetattr tag[2] valid[8] qid[13] mode[4] uid[4] gid[4] nlink[8] + * rdev[8] size[8] blksize[8] blocks[8] + * atime_sec[8] atime_nsec[8] mtime_sec[8] mtime_nsec[8] + * ctime_sec[8] ctime_nsec[8] btime_sec[8] btime_nsec[8] + * gen[8] data_version[8] + */ +static void v9fs_rgetattr(P9Req *req, v9fs_attr *attr) +{ + v9fs_req_recv(req, P9_RGETATTR); + + v9fs_uint64_read(req, &attr->valid); + v9fs_memread(req, &attr->qid, 13); + v9fs_uint32_read(req, &attr->mode); + v9fs_uint32_read(req, &attr->uid); + v9fs_uint32_read(req, &attr->gid); + v9fs_uint64_read(req, &attr->nlink); + v9fs_uint64_read(req, &attr->rdev); + v9fs_uint64_read(req, &attr->size); + v9fs_uint64_read(req, &attr->blksize); + v9fs_uint64_read(req, &attr->blocks); + v9fs_uint64_read(req, &attr->atime_sec); + v9fs_uint64_read(req, &attr->atime_nsec); + v9fs_uint64_read(req, &attr->mtime_sec); + v9fs_uint64_read(req, &attr->mtime_nsec); + v9fs_uint64_read(req, &attr->ctime_sec); + v9fs_uint64_read(req, &attr->ctime_nsec); + v9fs_uint64_read(req, &attr->btime_sec); + v9fs_uint64_read(req, &attr->btime_nsec); + v9fs_uint64_read(req, &attr->gen); + v9fs_uint64_read(req, &attr->data_version); + + v9fs_req_free(req); +} + /* size[4] Treaddir tag[2] fid[4] offset[8] count[4] */ static P9Req *v9fs_treaddir(QVirtio9P *v9p, uint32_t fid, uint64_t offset, uint32_t count, uint16_t tag) @@ -589,21 +669,50 @@ static void do_version(QVirtio9P *v9p) g_assert_cmpmem(server_version, server_len, version, strlen(version)); } +/* + * utility function: walk to requested dir and return fid for that dir and + * the QIDs of server response + */ +static uint32_t do_walk_rqids(QVirtio9P *v9p, const char *path, uint16_t *nwqid, + v9fs_qid **wqid) +{ + char **wnames; + P9Req *req; + const uint32_t fid = genfid(); + + int nwnames = split(path, "/", &wnames); + + req = v9fs_twalk(v9p, 0, fid, nwnames, wnames, 0); + v9fs_req_wait_for_reply(req, NULL); + v9fs_rwalk(req, nwqid, wqid); + + split_free(&wnames); + return fid; +} + /* utility function: walk to requested dir and return fid for that dir */ static uint32_t do_walk(QVirtio9P *v9p, const char *path) { + return do_walk_rqids(v9p, path, NULL, NULL); +} + +/* utility function: walk to requested dir and expect passed error response */ +static void do_walk_expect_error(QVirtio9P *v9p, const char *path, uint32_t err) +{ char **wnames; P9Req *req; + uint32_t _err; const uint32_t fid = genfid(); int nwnames = split(path, "/", &wnames); req = v9fs_twalk(v9p, 0, fid, nwnames, wnames, 0); v9fs_req_wait_for_reply(req, NULL); - v9fs_rwalk(req, NULL, NULL); + v9fs_rlerror(req, &_err); + + g_assert_cmpint(_err, ==, err); split_free(&wnames); - return fid; } static void fs_version(void *obj, void *data, QGuestAllocator *t_alloc) @@ -612,14 +721,19 @@ static void fs_version(void *obj, void *data, QGuestAllocator *t_alloc) do_version(obj); } -static void do_attach(QVirtio9P *v9p) +static void do_attach_rqid(QVirtio9P *v9p, v9fs_qid *qid) { P9Req *req; do_version(v9p); req = v9fs_tattach(v9p, 0, getuid(), 0); v9fs_req_wait_for_reply(req, NULL); - v9fs_rattach(req, NULL); + v9fs_rattach(req, qid); +} + +static void do_attach(QVirtio9P *v9p) +{ + do_attach_rqid(v9p, NULL); } static void fs_attach(void *obj, void *data, QGuestAllocator *t_alloc) @@ -974,6 +1088,80 @@ static void fs_walk_no_slash(void *obj, void *data, QGuestAllocator *t_alloc) g_free(wnames[0]); } +static void fs_walk_nonexistent(void *obj, void *data, QGuestAllocator *t_alloc) +{ + QVirtio9P *v9p = obj; + alloc = t_alloc; + + do_attach(v9p); + /* + * The 9p2000 protocol spec says: "If the first element cannot be walked + * for any reason, Rerror is returned." + */ + do_walk_expect_error(v9p, "non-existent", ENOENT); +} + +static void fs_walk_2nd_nonexistent(void *obj, void *data, + QGuestAllocator *t_alloc) +{ + QVirtio9P *v9p = obj; + 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, |