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Subject[PATCH AUTOSEL 4.19 146/191] f2fs: update i_size after DIO completion
Date
From: Jaegeuk Kim <jaegeuk@kernel.org>

[ Upstream commit 0a4daae5ffea39f5015334e4d18a6a80b447cae4 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/f2fs/data.c | 15 +++++++--------
fs/f2fs/f2fs.h | 1 +
2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9511466bc7857..c0d0744a52a55 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -887,7 +887,6 @@ 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;

@@ -916,12 +915,10 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
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;
}

@@ -1087,6 +1084,8 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
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)
@@ -1266,7 +1265,7 @@ 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 fb216488d67a9..6beda9147d3a0 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -600,6 +600,7 @@ 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,
--
2.20.1
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