pnfs/blocklayout: fix last_write_offset incorrectly set to page boundary

Commit 41963c10c47a35185e68cb9049f7a3493c94d2d7 sets the block layout's
last written byte to the offset of the end of the extent rather than the
end of the write which incorrectly updates the inode's size for
partial-page writes.

Fixes: 41963c10c47a ("pnfs/blocklayout: update last_write_offset atomically with extents")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 4.8+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 217847679f0eac675492ac049cbc0a42a6f75066..2905479f214a4654223ec90ae13e21138ac2be4d 100644 (file)
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -344,9 +344,10 @@ static void bl_write_cleanup(struct work_struct *work)
                u64 start = hdr->args.offset & (loff_t)PAGE_MASK;
                u64 end = (hdr->args.offset + hdr->args.count +
                        PAGE_SIZE - 1) & (loff_t)PAGE_MASK;
+               u64 lwb = hdr->args.offset + hdr->args.count;
 
                ext_tree_mark_written(bl, start >> SECTOR_SHIFT,
-                                       (end - start) >> SECTOR_SHIFT, end);
+                                       (end - start) >> SECTOR_SHIFT, lwb);
        }
 
        pnfs_ld_write_done(hdr);