diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fuse/file.c | 33 |
1 files changed, 12 insertions, 21 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 10e9fcd8fe55..7db564d18dc6 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1294,7 +1294,7 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, size_t nbytes = 0; /* # bytes already packed in req */ /* Special case for kernel I/O: can copy directly into the buffer */ - if (segment_eq(get_fs(), KERNEL_DS)) { + if (ii->type & REQ_KERNEL) { unsigned long user_addr = fuse_get_user_addr(ii); size_t frag_size = fuse_get_frag_size(ii, *nbytesp); @@ -1310,35 +1310,26 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, while (nbytes < *nbytesp && req->num_pages < req->max_pages) { unsigned npages; - unsigned long user_addr = fuse_get_user_addr(ii); - unsigned offset = user_addr & ~PAGE_MASK; - size_t frag_size = fuse_get_frag_size(ii, *nbytesp - nbytes); - int ret; - + size_t start, end, frag_size; unsigned n = req->max_pages - req->num_pages; - frag_size = min_t(size_t, frag_size, n << PAGE_SHIFT); - - npages = (frag_size + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; - npages = clamp(npages, 1U, n); - - ret = get_user_pages_fast(user_addr, npages, !write, - &req->pages[req->num_pages]); + ssize_t ret = iov_iter_get_pages(ii, + &req->pages[req->num_pages], + n * PAGE_SIZE, &start); if (ret < 0) return ret; - npages = ret; - frag_size = min_t(size_t, frag_size, - (npages << PAGE_SHIFT) - offset); - iov_iter_advance(ii, frag_size); + iov_iter_advance(ii, ret); + nbytes += ret; - req->page_descs[req->num_pages].offset = offset; + ret += start; + npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; + + req->page_descs[req->num_pages].offset = start; fuse_page_descs_length_init(req, req->num_pages, npages); req->num_pages += npages; req->page_descs[req->num_pages - 1].length -= - (npages << PAGE_SHIFT) - offset - frag_size; - - nbytes += frag_size; + (PAGE_SIZE - ret) & (PAGE_SIZE - 1); } if (write) |