From: Jaegeuk Kim <jaegeuk@kernel.org>
To: Chao Yu <yuchao0@huawei.com>
Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 6/6] f2fs: set I_LINKABLE early to avoid wrong access by vfs
Date: Tue, 10 Dec 2019 17:21:21 -0800 [thread overview]
Message-ID: <20191211012121.GA52962@jaegeuk-macbookpro.roam.corp.google.com> (raw)
In-Reply-To: <88dcbca9-3757-a440-ed73-9d99a56b816c@huawei.com>
On 12/10, Chao Yu wrote:
> On 2019/12/10 6:23, Jaegeuk Kim wrote:
> > This patch moves setting I_LINKABLE early in rename2(whiteout) to avoid the
> > below warning.
> >
> > [ 3189.163385] WARNING: CPU: 3 PID: 59523 at fs/inode.c:358 inc_nlink+0x32/0x40
> > [ 3189.246979] Call Trace:
> > [ 3189.248707] f2fs_init_inode_metadata+0x2d6/0x440 [f2fs]
> > [ 3189.251399] f2fs_add_inline_entry+0x162/0x8c0 [f2fs]
> > [ 3189.254010] f2fs_add_dentry+0x69/0xe0 [f2fs]
> > [ 3189.256353] f2fs_do_add_link+0xc5/0x100 [f2fs]
> > [ 3189.258774] f2fs_rename2+0xabf/0x1010 [f2fs]
> > [ 3189.261079] vfs_rename+0x3f8/0xaa0
> > [ 3189.263056] ? tomoyo_path_rename+0x44/0x60
> > [ 3189.265283] ? do_renameat2+0x49b/0x550
> > [ 3189.267324] do_renameat2+0x49b/0x550
> > [ 3189.269316] __x64_sys_renameat2+0x20/0x30
> > [ 3189.271441] do_syscall_64+0x5a/0x230
> > [ 3189.273410] entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > [ 3189.275848] RIP: 0033:0x7f270b4d9a49
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> > fs/f2fs/namei.c | 27 +++++++++++++--------------
> > 1 file changed, 13 insertions(+), 14 deletions(-)
> >
> > diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> > index a1c507b0b4ac..5d9584281935 100644
> > --- a/fs/f2fs/namei.c
> > +++ b/fs/f2fs/namei.c
> > @@ -797,6 +797,7 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
> >
> > if (whiteout) {
> > f2fs_i_links_write(inode, false);
> > + inode->i_state |= I_LINKABLE;
> > *whiteout = inode;
> > } else {
> > d_tmpfile(dentry, inode);
> > @@ -867,6 +868,12 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > F2FS_I(old_dentry->d_inode)->i_projid)))
> > return -EXDEV;
> >
> > + if (flags & RENAME_WHITEOUT) {
> > + err = f2fs_create_whiteout(old_dir, &whiteout);
> > + if (err)
> > + return err;
> > + }
>
> To record quota info correctly, we need to create whiteout inode after
> dquot_initialize(old_dir)?
__f2fs_tmpfile() will do it.
>
> > +
> > err = dquot_initialize(old_dir);
> > if (err)
> > goto out;
> > @@ -898,17 +905,11 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > }
> > }
> >
> > - if (flags & RENAME_WHITEOUT) {
> > - err = f2fs_create_whiteout(old_dir, &whiteout);
> > - if (err)
> > - goto out_dir;
> > - }
> > -
> > if (new_inode) {
> >
> > err = -ENOTEMPTY;
> > if (old_dir_entry && !f2fs_empty_dir(new_inode))
> > - goto out_whiteout;
> > + goto out_dir;
> >
> > err = -ENOENT;
> > new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
> > @@ -916,7 +917,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > if (!new_entry) {
> > if (IS_ERR(new_page))
> > err = PTR_ERR(new_page);
> > - goto out_whiteout;
> > + goto out_dir;
> > }
> >
> > f2fs_balance_fs(sbi, true);
> > @@ -948,7 +949,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > err = f2fs_add_link(new_dentry, old_inode);
> > if (err) {
> > f2fs_unlock_op(sbi);
> > - goto out_whiteout;
> > + goto out_dir;
> > }
> >
> > if (old_dir_entry)
> > @@ -972,7 +973,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > if (IS_ERR(old_page))
> > err = PTR_ERR(old_page);
> > f2fs_unlock_op(sbi);
> > - goto out_whiteout;
> > + goto out_dir;
> > }
> > }
> > }
> > @@ -991,7 +992,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
> >
> > if (whiteout) {
> > - whiteout->i_state |= I_LINKABLE;
> > set_inode_flag(whiteout, FI_INC_LINK);
> > err = f2fs_add_link(old_dentry, whiteout);
>
> [ 3189.256353] f2fs_do_add_link+0xc5/0x100 [f2fs]
> [ 3189.258774] f2fs_rename2+0xabf/0x1010 [f2fs]
>
> Does the call stack point here? if so, we have set I_LINKABLE before
> f2fs_add_link(), why the warning still be triggered?
>
> Thanks,
>
> > if (err)
> > @@ -1027,15 +1027,14 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> > f2fs_unlock_op(sbi);
> > if (new_page)
> > f2fs_put_page(new_page, 0);
> > -out_whiteout:
> > - if (whiteout)
> > - iput(whiteout);
> > out_dir:
> > if (old_dir_entry)
> > f2fs_put_page(old_dir_page, 0);
> > out_old:
> > f2fs_put_page(old_page, 0);
> > out:
> > + if (whiteout)
> > + iput(whiteout);
> > return err;
> > }
> >
> >
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next prev parent reply other threads:[~2019-12-11 1:21 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 22:23 [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance_fs outside of locked page Jaegeuk Kim
2019-12-09 22:23 ` [f2fs-dev] [PATCH 2/6] f2fs: declare nested quota_sem and remove unnecessary sems Jaegeuk Kim
2019-12-10 6:20 ` Chao Yu
2019-12-09 22:23 ` [f2fs-dev] [PATCH 3/6] f2fs: keep quota data on write_begin failure Jaegeuk Kim
2019-12-10 6:22 ` Chao Yu
2019-12-09 22:23 ` [f2fs-dev] [PATCH 4/6] f2fs: should avoid recursive filesystem ops Jaegeuk Kim
2019-12-10 6:22 ` Chao Yu
2019-12-09 22:23 ` [f2fs-dev] [PATCH 5/6] f2fs: set GFP_NOFS when moving inline dentries Jaegeuk Kim
2019-12-10 6:22 ` Chao Yu
2019-12-09 22:23 ` [f2fs-dev] [PATCH 6/6] f2fs: set I_LINKABLE early to avoid wrong access by vfs Jaegeuk Kim
2019-12-10 6:37 ` Chao Yu
2019-12-11 1:21 ` Jaegeuk Kim [this message]
2019-12-11 1:23 ` Chao Yu
2019-12-11 1:31 ` Jaegeuk Kim
2019-12-11 1:42 ` Chao Yu
2019-12-12 16:55 ` Jaegeuk Kim
2019-12-10 2:09 ` [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance_fs outside of locked page Chao Yu
2020-02-22 4:46 ` Ondřej Jirman
2020-02-22 18:17 ` [f2fs-dev] Writes stoped working on f2fs after the compression support was added Ondřej Jirman
2020-02-24 10:37 ` Chao Yu
2020-02-24 10:41 ` Chao Yu
2020-02-24 13:58 ` Ondřej Jirman
2020-02-24 14:03 ` Ondřej Jirman
2020-02-24 14:31 ` Ondřej Jirman
2020-02-25 11:24 ` Chao Yu
2020-02-25 11:32 ` Chao Yu
2020-02-25 12:08 ` Ondřej Jirman
2020-02-25 12:27 ` Ondřej Jirman
2020-02-26 1:58 ` Chao Yu
2020-02-26 12:11 ` Ondřej Jirman
2020-02-26 18:05 ` Ondřej Jirman
2020-02-27 2:01 ` Chao Yu
2020-03-06 12:02 ` Ondřej Jirman
2020-03-06 12:43 ` Ondřej Jirman
2020-03-11 9:02 ` Chao Yu
2020-03-11 10:33 ` Ondřej Jirman
2020-03-11 10:51 ` Chao Yu
2020-03-11 11:01 ` Ondřej Jirman
2020-03-11 12:13 ` Chao Yu
2020-03-11 17:01 ` Jaegeuk Kim
2020-03-22 10:15 ` Chao Yu
2020-02-24 14:20 ` Ondřej Jirman
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