f2fs: fix to map blocks correctly for direct write

f2fs_map_blocks() supports to map continuous holes or preallocated
address, we should avoid setting F2FS_MAP_MAPPED for these cases
only, otherwise, it may fail f2fs_iomap_begin(), and make direct
write fallbacking to use buffered IO and flush, result in performance
regression.

Fixes: 9f0f6bf42714 ("f2fs: support to map continuous holes or preallocated address")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202409122103.e45aa13b-oliver.sang@intel.com
Cc: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 402e00d..b33aca2 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1676,7 +1676,8 @@ next_block:
                /* reserved delalloc block should be mapped for fiemap. */
                if (blkaddr == NEW_ADDR)
                        map->m_flags |= F2FS_MAP_DELALLOC;
-               if (flag != F2FS_GET_BLOCK_DIO || !is_hole)
+               /* DIO READ and hole case, should not map the blocks. */
+               if (!(flag == F2FS_GET_BLOCK_DIO && is_hole && !map->m_may_create))
                        map->m_flags |= F2FS_MAP_MAPPED;
 
                map->m_pblk = blkaddr;