fuse: rework fuse_perform_write()

The patch allocates as many page pointers in fuse_req as needed to cover
interval [pos .. pos+len-1]. Inline helper fuse_wr_pages() is introduced
to hide this cumbersome arithmetic.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5fd06ba..b997250 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -881,11 +881,19 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
                if (!fc->big_writes)
                        break;
        } while (iov_iter_count(ii) && count < fc->max_write &&
-                req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0);
+                req->num_pages < req->max_pages && offset == 0);
 
        return count > 0 ? count : err;
 }
 
+static inline unsigned fuse_wr_pages(loff_t pos, size_t len)
+{
+       return min_t(unsigned,
+                    ((pos + len - 1) >> PAGE_CACHE_SHIFT) -
+                    (pos >> PAGE_CACHE_SHIFT) + 1,
+                    FUSE_MAX_PAGES_PER_REQ);
+}
+
 static ssize_t fuse_perform_write(struct file *file,
                                  struct address_space *mapping,
                                  struct iov_iter *ii, loff_t pos)
@@ -901,8 +909,9 @@ 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));
 
-               req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ);
+               req = fuse_get_req(fc, nr_pages);
                if (IS_ERR(req)) {
                        err = PTR_ERR(req);
                        break;