Messages in this thread | | | Date | Tue, 10 Dec 2019 17:21:21 -0800 | From | Jaegeuk Kim <> | Subject | Re: [f2fs-dev] [PATCH 6/6] f2fs: set I_LINKABLE early to avoid wrong access by vfs |
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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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