From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NrSsT-0001s9-RG for qemu-devel@nongnu.org; Tue, 16 Mar 2010 05:15:53 -0400 Received: from [199.232.76.173] (port=39544 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NrSsS-0001rY-Uw for qemu-devel@nongnu.org; Tue, 16 Mar 2010 05:15:53 -0400 Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) (envelope-from ) id 1NrSsQ-0000Pa-FE for qemu-devel@nongnu.org; Tue, 16 Mar 2010 05:15:52 -0400 Received: from mx20.gnu.org ([199.232.41.8]:47214) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NrSsP-0000Is-Sv for qemu-devel@nongnu.org; Tue, 16 Mar 2010 05:15:50 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1NrSsK-0001X7-RH for qemu-devel@nongnu.org; Tue, 16 Mar 2010 05:15:45 -0400 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [202.81.31.247]) by e23smtp08.au.ibm.com (8.14.3/8.13.1) with ESMTP id o2G9FeOh001962 for ; Tue, 16 Mar 2010 20:15:40 +1100 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o2G99jj61323164 for ; Tue, 16 Mar 2010 20:09:45 +1100 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id o2G9Fdba005748 for ; Tue, 16 Mar 2010 20:15:39 +1100 From: "Aneesh Kumar K.V" Date: Tue, 16 Mar 2010 14:45:03 +0530 Message-Id: <1268730920-14584-6-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1268730920-14584-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1268730920-14584-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH -v2 05/22] virtio-9p: Implement P9_TWALK List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: ericvh@gmail.com, aliguori@us.ibm.com, "Aneesh Kumar K.V" , Gautham R Shenoy From: Anthony Liguori Signed-off-by: Anthony Liguori Signed-off-by: Gautham R Shenoy Signed-off-by: Aneesh Kumar K.V --- hw/virtio-9p-local.c | 12 +++ hw/virtio-9p.c | 219 +++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 229 insertions(+), 2 deletions(-) diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c index aefb5a8..409f5b0 100644 --- a/hw/virtio-9p-local.c +++ b/hw/virtio-9p-local.c @@ -78,10 +78,22 @@ static ssize_t local_readlink(void *opaque, const char *path, return readlink(rpath(path), buf, bufsz); } +static int local_close(void *opaque, int fd) +{ + return close(fd); +} + +static int local_closedir(void *opaque, DIR *dir) +{ + return closedir(dir); +} + static V9fsPosixFileOperations ops = { .lstat = local_lstat, .setuid = local_setuid, .readlink = local_readlink, + .close = local_close, + .closedir = local_closedir, }; V9fsPosixFileOperations *virtio_9p_init_local(const char *path) diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index de5f6b0..784d399 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -117,6 +117,22 @@ static ssize_t posix_readlink(V9fsState *s, V9fsString *path, V9fsString *buf) return len; } +static int posix_close(V9fsState *s, int fd) +{ + return s->ops->close(s->ops->opaque, fd); +} + +static int posix_closedir(V9fsState *s, DIR *dir) +{ + return s->ops->closedir(s->ops->opaque, dir); +} + +static void v9fs_string_init(V9fsString *str) +{ + str->data = NULL; + str->size = 0; +} + static void v9fs_string_free(V9fsString *str) { qemu_free(str->data); @@ -144,6 +160,12 @@ static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) str->size = err; } +static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) +{ + v9fs_string_free(lhs); + v9fs_string_sprintf(lhs, "%s", rhs->data); +} + static size_t v9fs_string_size(V9fsString *str) { return str->size; @@ -184,6 +206,31 @@ static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) return f; } +static int free_fid(V9fsState *s, int32_t fid) +{ + V9fsFidState **fidpp, *fidp; + + for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { + if ((*fidpp)->fid == fid) + break; + } + + if (*fidpp == NULL) + return -ENOENT; + + fidp = *fidpp; + *fidpp = fidp->next; + + if (fidp->fd != -1) + posix_close(s, fidp->fd); + if (fidp->dir) + posix_closedir(s, fidp->dir); + v9fs_string_free(&fidp->path); + qemu_free(fidp); + + return 0; +} + #define P9_QID_TYPE_DIR 0x80 #define P9_QID_TYPE_SYMLINK 0x02 @@ -689,10 +736,178 @@ out: qemu_free(vs); } +typedef struct V9fsWalkState { + V9fsPDU *pdu; + size_t offset; + int32_t fid; + int32_t newfid; + int16_t nwnames; + int name_idx; + V9fsQID *qids; + V9fsFidState *fidp; + V9fsFidState *newfidp; + V9fsString path; + V9fsString *wnames; + struct stat stbuf; +} V9fsWalkState; + +static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err) +{ + complete_pdu(s, vs->pdu, err); + + if(vs->nwnames) { + for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) + v9fs_string_free(&vs->wnames[vs->name_idx]); + + qemu_free(vs->wnames); + qemu_free(vs->qids); + } +} + +static void v9fs_walk_marshal(V9fsWalkState *vs) +{ + int i; + vs->offset = 7; + vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames); + + for (i = 0; i < vs->nwnames; i++) + vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]); +} + +static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs, + int err) +{ + if (err == -1) { + free_fid(s, vs->newfid); + v9fs_string_free(&vs->path); + err = -ENOENT; + goto out; + } + + stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); + + vs->name_idx++; + if (vs->name_idx < vs->nwnames) { + v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, + vs->wnames[vs->name_idx].data); + v9fs_string_copy(&vs->newfidp->path, &vs->path); + + err = posix_lstat(s, &vs->newfidp->path, &vs->stbuf); + v9fs_walk_post_newfid_lstat(s, vs, err); + return; + } + + v9fs_string_free(&vs->path); + v9fs_walk_marshal(vs); + err = vs->offset; +out: + v9fs_walk_complete(s, vs, err); +} + +static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs, + int err) +{ + if (err == -1) { + v9fs_string_free(&vs->path); + err = -ENOENT; + goto out; + } + + stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); + vs->name_idx++; + if (vs->name_idx < vs->nwnames) { + + v9fs_string_sprintf(&vs->path, "%s/%s", + vs->fidp->path.data, vs->wnames[vs->name_idx].data); + v9fs_string_copy(&vs->fidp->path, &vs->path); + + err = posix_lstat(s, &vs->fidp->path, &vs->stbuf); + v9fs_walk_post_oldfid_lstat(s, vs, err); + return; + } + + v9fs_string_free(&vs->path); + v9fs_walk_marshal(vs); + err = vs->offset; +out: + v9fs_walk_complete(s, vs, err); +} + static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) { - if (debug_9p_pdu) - pprint_pdu(pdu); + V9fsWalkState *vs; + int err = 0; + int i; + + vs = qemu_malloc(sizeof(*vs)); + vs->pdu =pdu; + vs->wnames = NULL; + vs->qids = NULL; + vs->offset = 7; + + vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &vs->fid, + &vs->newfid, &vs->nwnames); + + if(vs->nwnames) { + vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames); + BUG_ON(vs->wnames == NULL); + + vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames); + BUG_ON(vs->qids == NULL); + + for (i = 0; i < vs->nwnames; i++) { + vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s", + &vs->wnames[i]); + } + } + + vs->fidp = lookup_fid(s, vs->fid); + if (vs->fidp == NULL) { + err = -ENOENT; + goto out; + } + + /* FIXME: is this really valid? */ + if (vs->fid == vs->newfid) { + v9fs_string_init(&vs->path); + vs->name_idx = 0; + + if (vs->name_idx < vs->nwnames) { + v9fs_string_sprintf(&vs->path, "%s/%s", + vs->fidp->path.data, vs->wnames[vs->name_idx].data); + v9fs_string_copy(&vs->fidp->path, &vs->path); + + err = posix_lstat(s, &vs->fidp->path, &vs->stbuf); + v9fs_walk_post_oldfid_lstat(s, vs, err); + return; + } + } else { + vs->newfidp = alloc_fid(s, vs->newfid); + if (vs->newfidp == NULL) { + err = -EINVAL; + goto out; + } + + vs->newfidp->uid = vs->fidp->uid; + v9fs_string_init(&vs->path); + vs->name_idx = 0; + v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path); + + if (vs->name_idx < vs->nwnames) { + v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, + vs->wnames[vs->name_idx].data); + v9fs_string_copy(&vs->newfidp->path, &vs->path); + + err = posix_lstat(s, &vs->newfidp->path, &vs->stbuf); + v9fs_walk_post_newfid_lstat(s, vs, err); + return; + } + } + + v9fs_walk_marshal(vs); + err = vs->offset; +out: + v9fs_walk_complete(s, vs, err); } static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) -- 1.7.0.2.273.gc2413