If fc->big_writes == 0, for write-operation it only do 4k in func fuse_fill_write_pages. So when alloc fuse_req,we should consider this restrict in order to do additional operations. The additional operations are memset-opeartion in func fuse_requenst_alloc and alloc more space if nr_pages is larger than FUSE_REQ_MIN_PAGES.
Signed-off-by: Jianpeng Ma <majianp...@gmail.com> --- fs/fuse/file.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 34b80ba..c584a31 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -912,8 +912,13 @@ static ssize_t fuse_perform_write(struct file *file, do { struct fuse_req *req; ssize_t count; - unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii)); + unsigned nr_pages; + if (!fc->big_writes) + nr_pages = 1; + else + nr_pages = fuse_wr_pages(pos, iov_iter_count(ii)); + req = fuse_get_req(fc, nr_pages); if (IS_ERR(req)) { err = PTR_ERR(req); -- 1.8.2.rc2.4.g7799588 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/