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fuse: convert ioctl to simple api
fuse_simple_request() is converted to return length of last (instead of single) out arg, since FUSE_IOCTL_OUT has two out args, the second of which is variable length. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
parent
4c4f03f78c
commit
093f38a2c1
@ -590,8 +590,8 @@ ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
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__fuse_request_send(fc, req);
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ret = req->out.h.error;
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if (!ret && args->out_argvar) {
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BUG_ON(args->out_numargs != 1);
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ret = req->out.args[0].size;
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BUG_ON(args->out_numargs == 0);
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ret = req->out.args[args->out_numargs - 1].size;
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}
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fuse_put_request(fc, req);
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@ -1267,14 +1267,14 @@ out:
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return written ? written : err;
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}
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static inline void fuse_page_descs_length_init(struct fuse_req *req,
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unsigned index, unsigned nr_pages)
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static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs,
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unsigned int index,
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unsigned int nr_pages)
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{
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int i;
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for (i = index; i < index + nr_pages; i++)
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req->page_descs[i].length = PAGE_SIZE -
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req->page_descs[i].offset;
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descs[i].length = PAGE_SIZE - descs[i].offset;
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}
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static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
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@ -1326,7 +1326,8 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE;
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req->page_descs[req->num_pages].offset = start;
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fuse_page_descs_length_init(req, req->num_pages, npages);
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fuse_page_descs_length_init(req->page_descs, req->num_pages,
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npages);
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req->num_pages += npages;
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req->page_descs[req->num_pages - 1].length -=
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@ -2582,14 +2583,14 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
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.flags = flags
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};
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struct fuse_ioctl_out outarg;
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struct fuse_req *req = NULL;
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struct page **pages = NULL;
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struct iovec *iov_page = NULL;
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struct iovec *in_iov = NULL, *out_iov = NULL;
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unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
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size_t in_size, out_size, transferred, c;
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unsigned int in_iovs = 0, out_iovs = 0, max_pages;
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size_t in_size, out_size, c;
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ssize_t transferred;
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int err, i;
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struct iov_iter ii;
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struct fuse_args_pages ap = {};
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#if BITS_PER_LONG == 32
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inarg.flags |= FUSE_IOCTL_32BIT;
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@ -2607,11 +2608,13 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
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BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
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err = -ENOMEM;
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pages = kcalloc(fc->max_pages, sizeof(pages[0]), GFP_KERNEL);
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ap.pages = fuse_pages_alloc(fc->max_pages, GFP_KERNEL, &ap.descs);
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iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
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if (!pages || !iov_page)
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if (!ap.pages || !iov_page)
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goto out;
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fuse_page_descs_length_init(ap.descs, 0, fc->max_pages);
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/*
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* If restricted, initialize IO parameters as encoded in @cmd.
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* RETRY from server is not allowed.
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@ -2648,56 +2651,44 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
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err = -ENOMEM;
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if (max_pages > fc->max_pages)
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goto out;
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while (num_pages < max_pages) {
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pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
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if (!pages[num_pages])
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while (ap.num_pages < max_pages) {
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ap.pages[ap.num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
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if (!ap.pages[ap.num_pages])
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goto out;
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num_pages++;
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ap.num_pages++;
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}
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req = fuse_get_req(fc, num_pages);
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if (IS_ERR(req)) {
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err = PTR_ERR(req);
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req = NULL;
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goto out;
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}
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memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
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req->num_pages = num_pages;
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fuse_page_descs_length_init(req, 0, req->num_pages);
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/* okay, let's send it to the client */
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req->in.h.opcode = FUSE_IOCTL;
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req->in.h.nodeid = ff->nodeid;
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req->in.numargs = 1;
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req->in.args[0].size = sizeof(inarg);
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req->in.args[0].value = &inarg;
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ap.args.opcode = FUSE_IOCTL;
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ap.args.nodeid = ff->nodeid;
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ap.args.in_numargs = 1;
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ap.args.in_args[0].size = sizeof(inarg);
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ap.args.in_args[0].value = &inarg;
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if (in_size) {
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req->in.numargs++;
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req->in.args[1].size = in_size;
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req->in.argpages = 1;
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ap.args.in_numargs++;
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ap.args.in_args[1].size = in_size;
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ap.args.in_pages = true;
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err = -EFAULT;
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iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size);
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for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) {
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c = copy_page_from_iter(pages[i], 0, PAGE_SIZE, &ii);
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for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
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c = copy_page_from_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
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if (c != PAGE_SIZE && iov_iter_count(&ii))
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goto out;
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}
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}
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req->out.numargs = 2;
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req->out.args[0].size = sizeof(outarg);
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req->out.args[0].value = &outarg;
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req->out.args[1].size = out_size;
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req->out.argpages = 1;
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req->out.argvar = 1;
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ap.args.out_numargs = 2;
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ap.args.out_args[0].size = sizeof(outarg);
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ap.args.out_args[0].value = &outarg;
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ap.args.out_args[1].size = out_size;
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ap.args.out_pages = true;
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ap.args.out_argvar = true;
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fuse_request_send(fc, req);
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err = req->out.h.error;
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transferred = req->out.args[1].size;
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fuse_put_request(fc, req);
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req = NULL;
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if (err)
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transferred = fuse_simple_request(fc, &ap.args);
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err = transferred;
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if (transferred < 0)
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goto out;
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/* did it ask for retry? */
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@ -2722,7 +2713,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
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in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
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goto out;
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vaddr = kmap_atomic(pages[0]);
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vaddr = kmap_atomic(ap.pages[0]);
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err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr,
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transferred, in_iovs + out_iovs,
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(flags & FUSE_IOCTL_COMPAT) != 0);
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@ -2750,19 +2741,17 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
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err = -EFAULT;
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iov_iter_init(&ii, READ, out_iov, out_iovs, transferred);
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for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) {
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c = copy_page_to_iter(pages[i], 0, PAGE_SIZE, &ii);
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for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
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c = copy_page_to_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
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if (c != PAGE_SIZE && iov_iter_count(&ii))
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goto out;
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}
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err = 0;
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out:
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if (req)
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fuse_put_request(fc, req);
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free_page((unsigned long) iov_page);
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while (num_pages)
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__free_page(pages[--num_pages]);
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kfree(pages);
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while (ap.num_pages)
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__free_page(ap.pages[--ap.num_pages]);
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kfree(ap.pages);
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return err ? err : outarg.result;
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}
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