Re: [RFC PATCH v4 9/9] ovl: implement containerized syncfs for overlayfs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Nov 13, 2020 at 7:57 AM Chengguang Xu <cgxu519@xxxxxxxxxxxx> wrote:
>
> Now overlayfs can only sync dirty inode during syncfs,
> so remove unnecessary sync_filesystem() on upper file
> system.
>
> Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
> ---
>  fs/overlayfs/super.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
> index 982b3954b47c..58507f1cd583 100644
> --- a/fs/overlayfs/super.c
> +++ b/fs/overlayfs/super.c
> @@ -15,6 +15,8 @@
>  #include <linux/seq_file.h>
>  #include <linux/posix_acl_xattr.h>
>  #include <linux/exportfs.h>
> +#include <linux/blkdev.h>
> +#include <linux/writeback.h>
>  #include "overlayfs.h"
>
>  MODULE_AUTHOR("Miklos Szeredi <miklos@xxxxxxxxxx>");
> @@ -270,8 +272,7 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
>          * Not called for sync(2) call or an emergency sync (SB_I_SKIP_SYNC).
>          * All the super blocks will be iterated, including upper_sb.
>          *
> -        * If this is a syncfs(2) call, then we do need to call
> -        * sync_filesystem() on upper_sb, but enough if we do it when being
> +        * if this is a syncfs(2) call, it will be enough we do it when being
>          * called with wait == 1.
>          */
>         if (!wait)
> @@ -280,7 +281,11 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
>         upper_sb = ovl_upper_mnt(ofs)->mnt_sb;
>
>         down_read(&upper_sb->s_umount);
> -       ret = sync_filesystem(upper_sb);
> +       wait_sb_inodes(upper_sb);
> +       if (upper_sb->s_op->sync_fs)
> +               ret = upper_sb->s_op->sync_fs(upper_sb, wait);
> +       if (!ret)
> +               ret = sync_blockdev(upper_sb->s_bdev);

Should this instead be __sync_blockdev(..., wait)?

Thanks,
Miklos



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux