[Ocfs2-devel] [PATCH] ocfs2: the parent directory reference count should be increased only after the ocfs2_add_entry function is successfully called
piaojun
piaojun at huawei.com
Sun Mar 15 20:56:04 PDT 2020
On 2020/3/16 0:59, wangjian wrote:
> Under some conditions, the directory cannot be deleted.
> The specific scenarios are as follows: (for example,
> /mnt/ocfs2 is the mount point)
>
> 1. Create the /mnt/ocfs2/p_dir directory. At this time,
> the i_nlink corresponding to the inode of
> the /mnt/ocfs2/p_dir directory is equal to 2.
>
> 2. During the process of creating the
> /mnt/ocfs2/p_dir/s_dir directory, if the call to the inc_nlink
> function in ocfs2_mknod succeeds, the functions such as
> ocfs2_init_acl, ocfs2_init_security_set, and ocfs2_dentry_attach_lock fail.
> At this time, the i_nlink corresponding to the inode of the
> /mnt/ocfs2/p_dir directory is equal to 3, but /mnt/ocfs2/p_dir/s_dir
> is not added to the /mnt/ocfs2/p_dir directory entry.
>
> 3. Delete the /mnt/ocfs2/p_dir directory (rm -rf /mnt/ocfs2/p_dir).
> At this time, it is found that the i_nlink corresponding to
> the inode corresponding to the /mnt/ocfs2/p_dir directory is equal to 3.
> Therefore, the /mnt/ocfs2/p_dir directory cannot be deleted.
>
> Signed-off-by: Jian wang <wangjian161 at huawei.com>
> ---
> ocfs2/namei.c | 24 +++++++++++++-----------
> 1 file changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/ocfs2/namei.c b/ocfs2/namei.c
> index 8ea51cf..19543b4 100644
> --- a/ocfs2/namei.c
> +++ b/ocfs2/namei.c
> @@ -388,17 +388,6 @@ static int ocfs2_mknod(struct inode *dir,
> mlog_errno(status);
> goto leave;
> }
> -
> - status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
> - parent_fe_bh,
> - OCFS2_JOURNAL_ACCESS_WRITE);
> - if (status < 0) {
> - mlog_errno(status);
> - goto leave;
> - }
> - ocfs2_add_links_count(dirfe, 1);
> - ocfs2_journal_dirty(handle, parent_fe_bh);
> - inc_nlink(dir);
> }
>
> status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
> @@ -440,6 +429,19 @@ static int ocfs2_mknod(struct inode *dir,
> goto leave;
> }
>
> + if (S_ISDIR(mode)) {
> + status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
> + parent_fe_bh,
> + OCFS2_JOURNAL_ACCESS_WRITE);
> + if (status < 0) {
I wonder if we should rollback the inode's new_fe_bh if getting failed
here?
Jun
> + mlog_errno(status);
> + goto leave;
> + }
> + ocfs2_add_links_count(dirfe, 1);
> + ocfs2_journal_dirty(handle, parent_fe_bh);
> + inc_nlink(dir);
> + }
> +
> insert_inode_hash(inode);
> d_instantiate(dentry, inode);
> status = 0;
> --
> 1.8.3.1
>
>
>
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