[PATCH 17/19] xfs: simplify building the bio in xlog_write_iclog

[Christoph Hellwig]

Use the bio_add_virt_nofail and bio_add_vmalloc helpers to abstract
away the details of the memory allocation.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/xfs/xfs_log.c | 32 ++++++--------------------------
 1 file changed, 6 insertions(+), 26 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 980aabc49512..793468b4d30d 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1607,27 +1607,6 @@ xlog_bio_end_io(
                   &iclog->ic_end_io_work);
 }
 
-static int
-xlog_map_iclog_data(
-       struct bio              *bio,
-       void                    *data,
-       size_t                  count)
-{
-       do {
-               struct page     *page = kmem_to_page(data);
-               unsigned int    off = offset_in_page(data);
-               size_t          len = min_t(size_t, count, PAGE_SIZE - off);
-
-               if (bio_add_page(bio, page, len, off) != len)
-                       return -EIO;
-
-               data += len;
-               count -= len;
-       } while (count);
-
-       return 0;
-}
-
 STATIC void
 xlog_write_iclog(
        struct xlog             *log,
@@ -1693,11 +1672,12 @@ xlog_write_iclog(
 
        iclog->ic_flags &= ~(XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA);
 
-       if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count))
-               goto shutdown;
-
-       if (is_vmalloc_addr(iclog->ic_data))
-               flush_kernel_vmap_range(iclog->ic_data, count);
+       if (is_vmalloc_addr(iclog->ic_data)) {
+               if (!bio_add_vmalloc(&iclog->ic_bio, iclog->ic_data, count))
+                       goto shutdown;
+       } else {
+               bio_add_virt_nofail(&iclog->ic_bio, iclog->ic_data, count);
+       }
 
        /*
         * If this log buffer would straddle the end of the log we will have
-- 
2.47.2