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,