Messages in this thread Patch in this message | | | Subject | Re: [PATCH] f2fs: fix to avoid accessing uninitialized field of inode page in is_alive() | From | Chao Yu <> | Date | Mon, 9 Sep 2019 16:16:35 +0800 |
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On 2019/9/9 15:58, Chao Yu wrote: > On 2019/9/9 15:44, Jaegeuk Kim wrote: >> On 09/07, Chao Yu wrote: >>> On 2019-9-7 7:48, Jaegeuk Kim wrote: >>>> On 09/06, Chao Yu wrote: >>>>> If inode is newly created, inode page may not synchronize with inode cache, >>>>> so fields like .i_inline or .i_extra_isize could be wrong, in below call >>>>> path, we may access such wrong fields, result in failing to migrate valid >>>>> target block. >>>> >>>> If data is valid, how can we get new inode page? >> >> Let me rephrase the question. If inode is newly created, is this data block >> really valid to move in GC? > > I guess it's valid, let double check that.
We can see inode page:
- f2fs_create - f2fs_add_link - f2fs_add_dentry - f2fs_init_inode_metadata - f2fs_add_inline_entry - ipage = f2fs_new_inode_page - f2fs_put_page(ipage) <---- after this
> >> >>> >>> is_alive() >>> { >>> ... >>> node_page = f2fs_get_node_page(sbi, nid); <--- inode page >> >> Aren't we seeing the below version warnings? >> >> if (sum->version != dni->version) { >> f2fs_warn(sbi, "%s: valid data with mismatched node version.", >> __func__); >> set_sbi_flag(sbi, SBI_NEED_FSCK); >> }
The version of summary and dni are all zero.
summary nid: 613, ofs: 111, ver: 0 blkaddr 2436 (blkaddr in node 0) expect: seg 10, ofs_in_seg: 54 real: seg 4294967295, ofs_in_seg: 0 ofs: 54, 0 node info ino:613, nid:613, nofs:0 ofs_in_addr: 0
Thanks,
>> >>> >>> source_blkaddr = datablock_addr(NULL, node_page, ofs_in_node); >> >> So, we're getting this? Does this incur infinite loop in GC? >> >> if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) { >> f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n", >> f2fs_bug_on(sbi, 1); >> } > > Yes, I only get this with generic/269, rather than "valid data with mismatched > node version.". > > With this patch, generic/269 won't panic again. > > Thanks, > >> >>> ... >>> } >>> >>> datablock_addr() >>> { >>> ... >>> base = offset_in_addr(&raw_node->i); <--- the base could be wrong here due to >>> accessing uninitialized .i_inline of raw_node->i. >>> ... >>> } >>> >>> Thanks, >>> >>>> >>>>> >>>>> - gc_data_segment >>>>> - is_alive >>>>> - datablock_addr >>>>> - offset_in_addr >>>>> >>>>> Fixes: 7a2af766af15 ("f2fs: enhance on-disk inode structure scalability") >>>>> Signed-off-by: Chao Yu <yuchao0@huawei.com> >>>>> --- >>>>> fs/f2fs/dir.c | 3 +++ >>>>> 1 file changed, 3 insertions(+) >>>>> >>>>> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c >>>>> index 765f13354d3f..b1840852967e 100644 >>>>> --- a/fs/f2fs/dir.c >>>>> +++ b/fs/f2fs/dir.c >>>>> @@ -479,6 +479,9 @@ struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir, >>>>> if (IS_ERR(page)) >>>>> return page; >>>>> >>>>> + /* synchronize inode page's data from inode cache */ >>>>> + f2fs_update_inode(inode, page); >>>>> + >>>>> if (S_ISDIR(inode->i_mode)) { >>>>> /* in order to handle error case */ >>>>> get_page(page); >>>>> -- >>>>> 2.18.0.rc1 >> . >>
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