sdcard: use FUSE_BIG_WRITES for FUSE writes

Slightly optimizes the writes used by sdcard to increase
throughput and decrease cpu load. Update the read
size to 256 x 1024 + 128 from current 8192 bytes since
writes can go as high as that.

Change-Id: I3bad425f31d4aa6f44f546e3d31439fd5bdca9ea
Signed-off-by: Sundar Raman <[email protected]>

Author: Sundar Raman

sdcard/sdcard.c

@@ -912,7 +912,7 @@ void handle_fuse_request(struct fuse *fuse, struct fuse_in_header *hdr, void *da
         out.major = FUSE_KERNEL_VERSION;
         out.minor = FUSE_KERNEL_MINOR_VERSION;
         out.max_readahead = req->max_readahead;
-        out.flags = FUSE_ATOMIC_O_TRUNC;
+        out.flags = FUSE_ATOMIC_O_TRUNC | FUSE_BIG_WRITES;
         out.max_background = 32;
         out.congestion_threshold = 32;
         out.max_write = 256 * 1024;
@@ -941,7 +941,7 @@ void handle_fuse_requests(struct fuse *fuse)
     int len;
 
     for (;;) {
-        len = read(fuse->fd, req, 8192);
+        len = read(fuse->fd, req, sizeof(req));
         if (len < 0) {
             if (errno == EINTR)
                 continue;