From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Wed, 19 Sep 2018 22:28:40 +0000 (-0700)
Subject: f2fs: update i_size after DIO completion
X-Git-Tag: v5.15~7765^2~38
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a4daae5ffea39f5015334e4d18a6a80b447cae4;p=platform%2Fkernel%2Flinux-starfive.git

f2fs: update i_size after DIO completion

This is related to
ee70daaba82d ("xfs: update i_size after unwritten conversion in dio completion")

If we update i_size during dio_write, dio_read can read out stale data, which
breaks xfstests/465.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 57c0823..41102c2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -881,7 +881,6 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
 	struct f2fs_summary sum;
 	struct node_info ni;
 	block_t old_blkaddr;
-	pgoff_t fofs;
 	blkcnt_t count = 1;
 	int err;
 
@@ -910,12 +909,10 @@ alloc:
 					old_blkaddr, old_blkaddr);
 	f2fs_set_data_blkaddr(dn);
 
-	/* update i_size */
-	fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) +
-							dn->ofs_in_node;
-	if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_SHIFT))
-		f2fs_i_size_write(dn->inode,
-				((loff_t)(fofs + 1) << PAGE_SHIFT));
+	/*
+	 * i_size will be updated by direct_IO. Otherwise, we'll get stale
+	 * data from unwritten block via dio_read.
+	 */
 	return 0;
 }
 
@@ -1081,6 +1078,8 @@ next_block:
 					last_ofs_in_node = dn.ofs_in_node;
 				}
 			} else {
+				WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO &&
+					flag != F2FS_GET_BLOCK_DIO);
 				err = __allocate_data_block(&dn,
 							map->m_seg_type);
 				if (!err)
@@ -1260,7 +1259,7 @@ static int get_data_block_dio(struct inode *inode, sector_t iblock,
 			struct buffer_head *bh_result, int create)
 {
 	return __get_data_block(inode, iblock, bh_result, create,
-						F2FS_GET_BLOCK_DEFAULT, NULL,
+						F2FS_GET_BLOCK_DIO, NULL,
 						f2fs_rw_hint_to_seg_type(
 							inode->i_write_hint));
 }
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 125f8b7..b32fd9f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -599,6 +599,7 @@ enum {
 	F2FS_GET_BLOCK_DEFAULT,
 	F2FS_GET_BLOCK_FIEMAP,
 	F2FS_GET_BLOCK_BMAP,
+	F2FS_GET_BLOCK_DIO,
 	F2FS_GET_BLOCK_PRE_DIO,
 	F2FS_GET_BLOCK_PRE_AIO,
 	F2FS_GET_BLOCK_PRECACHE,