On 03/07, Chao Yu wrote:
> Below race case can cause data corruption:
>
> Thread A GC thread
> - f2fs_inplace_write_data
> - gc_data_segment
> - ra_data_block
> - locked meta_inode page
> - invalidate_mapping_pages
> : fail to invalidate meta_inode page
> due to lock failure or dirty|writeback
> status
Wasn't the original data page locked in both cases?
> - f2fs_submit_page_bio
> : write last dirty data to old blkaddr
> - move_data_block
> - load old data from meta_inode page
> - f2fs_submit_page_write
> : write old data to new blkaddr
>
> Because invalidate_mapping_pages() will skip invalidating page when the
> page has unclear status including locked, dirty, writeback and so on, so
> we need to use truncate_inode_pages_range() instead of
> invalidate_mapping_pages() to make sure meta_inode page will be dropped.
>
> Fixes: 6aa58d8ad20a ("f2fs: readahead encrypted block during GC")
> Fixes: e3b49ea36802 ("f2fs: invalidate META_MAPPING before IPU/DIO write")
> Signed-off-by: Chao Yu <[email protected]>
> ---
> fs/f2fs/checkpoint.c | 5 +++--
> fs/f2fs/f2fs.h | 28 +++++++++++++++++++++++++++-
> fs/f2fs/segment.c | 5 ++---
> include/linux/f2fs_fs.h | 1 +
> 4 files changed, 33 insertions(+), 6 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index a09a9609e228..55b7d2cf030f 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1598,8 +1598,9 @@ static int do_checkpoint(struct f2fs_sb_info *sbi,
> struct cp_control *cpc)
> */
> if (f2fs_sb_has_encrypt(sbi) || f2fs_sb_has_verity(sbi) ||
> f2fs_sb_has_compression(sbi))
> - invalidate_mapping_pages(META_MAPPING(sbi),
> - MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
> + f2fs_bug_on(sbi,
> + invalidate_inode_pages2_range(META_MAPPING(sbi),
> + MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1));
>
> f2fs_release_ino_entry(sbi, false);
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4836e7cb0efe..9814e5981a6a 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -4655,10 +4655,36 @@ static inline bool f2fs_is_readonly(struct
> f2fs_sb_info *sbi)
> return f2fs_sb_has_readonly(sbi) || f2fs_readonly(sbi->sb);
> }
>
> +static inline void f2fs_truncate_meta_inode_pages(struct f2fs_sb_info *sbi,
> + block_t blkaddr, unsigned int cnt)
> +{
> + bool need_submit = false;
> + int i = 0;
> +
> + do {
> + struct page *page;
> +
> + page = find_get_page(META_MAPPING(sbi), blkaddr + i);
> + if (page) {
> + if (PageWriteback(page))
> + need_submit = true;
> + f2fs_put_page(page, 0);
> + }
> + } while (++i < cnt && !need_submit);
> +
> + if (need_submit)
> + f2fs_submit_merged_write_cond(sbi, sbi->meta_inode,
> + NULL, 0, DATA);
> +
> + truncate_inode_pages_range(META_MAPPING(sbi),
> + F2FS_BLK_TO_BYTES((loff_t)blkaddr),
> + F2FS_BLK_END_BYTES((loff_t)(blkaddr + cnt - 1)));
> +}
> +
> static inline void f2fs_invalidate_internal_cache(struct f2fs_sb_info *sbi,
> block_t blkaddr)
> {
> - invalidate_mapping_pages(META_MAPPING(sbi), blkaddr, blkaddr);
> + f2fs_truncate_meta_inode_pages(sbi, blkaddr, 1);
> f2fs_invalidate_compress_page(sbi, blkaddr);
> }
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 4ff3b2d14ddf..20af48d7f784 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3741,8 +3741,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
> }
>
> if (fio->post_read)
> - invalidate_mapping_pages(META_MAPPING(sbi),
> - fio->new_blkaddr, fio->new_blkaddr);
> + f2fs_truncate_meta_inode_pages(sbi, fio->new_blkaddr, 1);
>
> stat_inc_inplace_blocks(fio->sbi);
>
> @@ -3932,7 +3931,7 @@ void f2fs_wait_on_block_writeback_range(struct inode
> *inode, block_t blkaddr,
> for (i = 0; i < len; i++)
> f2fs_wait_on_block_writeback(inode, blkaddr + i);
>
> - invalidate_mapping_pages(META_MAPPING(sbi), blkaddr, blkaddr + len - 1);
> + f2fs_truncate_meta_inode_pages(sbi, blkaddr, len);
> }
>
> static int read_compacted_summaries(struct f2fs_sb_info *sbi)
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index 755e9a41b196..a357287eac1e 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -27,6 +27,7 @@
>
> #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS)
> #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS)
> +#define F2FS_BLK_END_BYTES(blk) (F2FS_BLK_TO_BYTES(blk + 1) - 1)
>
> /* 0, 1(node nid), 2(meta nid) are reserved node id */
> #define F2FS_RESERVED_NODE_NUM 3
> --
> 2.40.1
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