sdcard: direct I/O file access write buffer alignment
It is not enough to align the read buffer only, because
consequent writes might still fail with EINVAL. The write
buffer should be also aligned according to the write(2)
manual page.
Change-Id: I7547dec5208732c56f4466c1b0c88f36dabacf5b
diff --git a/sdcard/sdcard.c b/sdcard/sdcard.c
index 3bc8cd3..cb03316 100644
--- a/sdcard/sdcard.c
+++ b/sdcard/sdcard.c
@@ -1244,6 +1244,12 @@
struct fuse_write_out out;
struct handle *h = id_to_ptr(req->fh);
int res;
+ __u8 aligned_buffer[req->size] __attribute__((__aligned__(PAGESIZE)));
+
+ if (req->flags & O_DIRECT) {
+ memcpy(aligned_buffer, buffer, req->size);
+ buffer = (const __u8*) aligned_buffer;
+ }
TRACE("[%d] WRITE %p(%d) %u@%llu\n", handler->token,
h, h->fd, req->size, req->offset);
