Hi Yuanliang,
Can you explain how to reproduce it? and what filesystem do you use as underlying fs?
> Sent: Tuesday, March 20, 2018 at 2:03 PM
> From: 王元良 <yuanliang.wyl@xxxxxxxxxxxxxxx>
> To: miklos@xxxxxxxxxx
> Cc: linux-unionfs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, 王元良 <yuanliang.wyl@xxxxxxxxxxxxxxx>
> Subject: [PATCH] fs/overlayfs: Drop dentry cache to prevent unknown file status
>
> When the dentry cache is not destroyed, statfs will
> take unknown status '?'
> Undestroyed cache dentry also caused new file creating fails
>
> Drop it using d_delete may be a choice
>
> [root@host /]
> Loaded plugins: bestyumcache, branch, fastestmirror, langpacks
> Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache
> fast
> Cleaning repos: xxx.base.x86_64 ops.x.noarch ops.x.x86_64
> Cleaning up everything
> Cleaning up list of best yumcache
> Cleaning up list of fastest mirrors
>
> [root@host /]
> Loaded plugins: bestyumcache, branch, fastestmirror, langpacks
> Cleaning repos: xxx.base.x86_64 ops.x.noarch ops.x.x86_64
> Cleaning up everything
> Cleaning up list of best yumcache
> Traceback (most recent call last):
> File "/usr/bin/yum", line 29, in <module>
> yummain.user_main(sys.argv[1:], exit_code=True)
> File "/usr/share/yum-cli/yummain.py", line 365, in user_main
> errcode = main(args)
> File "/usr/share/yum-cli/yummain.py", line 174, in main
> result, resultmsgs = base.doCommands()
> File "/usr/share/yum-cli/cli.py", line 573, in doCommands
> return self.yum_cli_commands[self.basecmd].doCommand(self,
> self.basecmd, self.extcmds)
> File "/usr/share/yum-cli/yumcommands.py", line
> 1475, in doCommand
> return base.cleanCli(extcmds)
> File "/usr/share/yum-cli/cli.py", line 1666, in
> cleanCli
> self.plugins.run('clean')
> File
> "/usr/lib/python2.7/site-packages/yum/plugins.py", line 188, in run
> func(conduitcls(self, self.base, conf, **kwargs))
> File "/usr/lib/yum-plugins/branch.py", line 65, in clean_hook
> os.remove(os.path.join(root,filespath))
> OSError: [Errno 2] No such file or directory:
> '/var/cache/yum/x86_64/x/xxxx.noarch.stable/
> b49e49b87d17818d799363091c7a01dde83b421d-primary.sqlite.bz2'
>
> [root@host /]
> ls: cannot access
> /var/cache/yum/x86_64/x/xxxx.noarch.stable/
> b49e49b87d17818d799363091c7a01dde83b421d-primary.sqlite.bz2:
> No such file or directory
> ls: cannot access
> /var/cache/yum/x86_64/x/xxxx.noarch.stable/cachecookie:
> No such file or directory
> ls: cannot access
> /var/cache/yum/x86_64/x/xxxx.noarch.stable/repomd.xml:
> No such file or directory
> total 0
> ?????????? ? ? ? ? ?
> b49e49b87d17818d799363091c7a01dde83b421d-primary.sqlite.bz2
> ?????????? ? ? ? ? ?
> cachecookie
> drwxr-xr-x 1 root root 30 Mar 15 16:12 gen
> drwxr-xr-x 2 root root 6 Jan 31 13:13
> packages
> ?????????? ? ? ? ? ?
> repomd.xml
>
> Signed-off-by: Yuanliang Wang <yuanliang.wyl@xxxxxxxxxxxxxxx>
> ---
> fs/overlayfs/super.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
> index e7c8ac4..f9343d3 100644
> --- a/fs/overlayfs/super.c
> +++ b/fs/overlayfs/super.c
> @@ -380,9 +380,15 @@ static int ovl_dentry_weak_revalidate(struct dentry *dentry, unsigned int flags)
> return ret;
> }
>
> +static int ovl_dentry_delete(const struct dentry *dentry)
> +{
> + return 1;
> +}
> +
> static const struct dentry_operations ovl_dentry_operations = {
> .d_release = ovl_dentry_release,
> .d_real = ovl_d_real,
> + .d_delete = ovl_dentry_delete,
> };
>
> static const struct dentry_operations ovl_reval_dentry_operations = {
> --
> 1.8.3.1
>
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