[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 11/29] tools/xenlogd: add 9pfs create request support
Add the create request of the 9pfs protocol. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- V2: - set permissions correctly (Jason Andryuk) --- tools/xen-9pfsd/io.c | 159 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) diff --git a/tools/xen-9pfsd/io.c b/tools/xen-9pfsd/io.c index c182ef0483..a605f51dc6 100644 --- a/tools/xen-9pfsd/io.c +++ b/tools/xen-9pfsd/io.c @@ -31,6 +31,7 @@ #define P9_CMD_ERROR 107 #define P9_CMD_WALK 110 #define P9_CMD_OPEN 112 +#define P9_CMD_CREATE 114 #define P9_CMD_CLUNK 120 /* P9 protocol open flags. */ @@ -41,6 +42,12 @@ #define P9_OTRUNC 0x10 /* or'ed in, truncate file first */ #define P9_OREMOVE 0x40 /* or'ed in, remove file after clunk */ +/* P9 protocol create permission masks. */ +#define P9_CREATE_PERM_DIR 0x80000000 +#define P9_CREATE_PERM_NOTSUPP 0x03b00000 /* link, symlink, ... */ +#define P9_CREATE_PERM_DIR_MASK 0777 +#define P9_CREATE_PERM_FILE_MASK 0666 + #define P9_MIN_MSIZE 2048 #define P9_VERSION "9P2000.u" #define P9_WALK_MAXELEM 16 @@ -944,6 +951,154 @@ static void p9_open(struct ring *ring, struct p9_header *hdr) fill_buffer(ring, hdr->cmd + 1, hdr->tag, "QU", &qid, &iounit); } +static void p9_create(struct ring *ring, struct p9_header *hdr) +{ + device *device = ring->device; + uint32_t fid; + unsigned int name_off; + uint32_t perm; + uint8_t mode; + unsigned int ext_off; + struct p9_fid *fidp; + struct p9_fid *new_fidp; + char *path; + struct stat st; + struct p9_qid qid; + uint32_t iounit; + int flags; + int ret; + + ret = fill_data(ring, "USUbS", &fid, &name_off, &perm, &mode, &ext_off); + if ( ret != 5 ) + { + p9_error(ring, hdr->tag, EINVAL); + return; + } + + if ( !name_ok(ring->str + name_off) ) + { + p9_error(ring, hdr->tag, ENOENT); + return; + } + + if ( perm & P9_CREATE_PERM_NOTSUPP ) + { + p9_error(ring, hdr->tag, EINVAL); + return; + } + + fidp = get_fid_ref(device, fid); + if ( !fidp || fidp->opened ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, EINVAL); + return; + } + if ( stat(fidp->path, &st) < 0 ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, errno); + return; + } + + path = malloc(strlen(fidp->path) + strlen(ring->str + name_off) + 2 - + strlen(device->host_path)); + if ( !path ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, ENOMEM); + return; + } + sprintf(path, "%s/%s", fidp->path + strlen(device->host_path), + ring->str + name_off); + new_fidp = alloc_fid_mem(device, fid, path); + free(path); + if ( !new_fidp ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, ENOMEM); + return; + } + + pthread_mutex_lock(&device->fid_mutex); + + new_fidp->ref = fidp->ref; + + if ( perm & P9_CREATE_PERM_DIR ) + { + perm &= P9_CREATE_PERM_DIR_MASK & st.st_mode; + if ( mode != P9_OREAD ) + { + p9_error(ring, hdr->tag, EINVAL); + free(new_fidp); + goto err; + } + if ( mkdir(new_fidp->path, perm) < 0 ) + { + p9_error(ring, hdr->tag, errno); + free(new_fidp); + goto err; + } + + XEN_TAILQ_REMOVE(&device->fids, fidp, list); + XEN_TAILQ_INSERT_HEAD(&device->fids, new_fidp, list); + free(fidp); + fidp = new_fidp; + + fidp->data = opendir(fidp->path); + if ( !fidp->data ) + { + p9_error(ring, hdr->tag, errno); + goto err; + } + fidp->fd = dirfd(fidp->data); + } + else + { + flags = open_flags_from_mode(mode); + if ( flags < 0 ) + { + p9_error(ring, hdr->tag, EINVAL); + free(new_fidp); + goto err; + } + flags |= perm & P9_CREATE_PERM_FILE_MASK & st.st_mode; + + XEN_TAILQ_REMOVE(&device->fids, fidp, list); + XEN_TAILQ_INSERT_HEAD(&device->fids, new_fidp, list); + free(fidp); + fidp = new_fidp; + + fidp->fd = creat(fidp->path, flags); + if ( fidp->fd < 0 ) + { + p9_error(ring, hdr->tag, errno); + goto err; + } + } + + if ( stat(fidp->path, &st) < 0 ) + { + p9_error(ring, hdr->tag, errno); + goto err; + } + fill_qid(fidp->path, &qid, &st); + iounit = get_iounit(ring, &st); + fidp->opened = true; + fidp->mode = mode; + + pthread_mutex_unlock(&device->fid_mutex); + + fill_buffer(ring, hdr->cmd + 1, hdr->tag, "QU", &qid, &iounit); + + return; + + err: + pthread_mutex_unlock(&device->fid_mutex); + + free_fid(device, fidp); +} + static void p9_clunk(struct ring *ring, struct p9_header *hdr) { device *device = ring->device; @@ -1052,6 +1207,10 @@ void *io_thread(void *arg) p9_open(ring, &hdr); break; + case P9_CMD_CREATE: + p9_create(ring, &hdr); + break; + case P9_CMD_CLUNK: p9_clunk(ring, &hdr); break; -- 2.35.3
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