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    Btrfs: dir_inode_operations should use btrfs_update_time also · 93fd63c2
    Guangyu Sun 提交于
    Commit 2bc55652 (Btrfs: don't update atime on
    RO subvolumes) ensures that the access time of an inode is not updated when
    the inode lives in a read-only subvolume.
    However, if a directory on a read-only subvolume is accessed, the atime is
    updated. This results in a write operation to a read-only subvolume. I
    believe that access times should never be updated on read-only subvolumes.
    
    To reproduce:
    
     # mkfs.btrfs -f /dev/dm-3
     (...)
     # mount /dev/dm-3 /mnt
     # btrfs subvol create /mnt/sub
     	Create subvolume '/mnt/sub'
     # mkdir /mnt/sub/dir
     # echo "abc" > /mnt/sub/dir/file
     # btrfs subvol snapshot -r /mnt/sub /mnt/rosnap
     	Create a readonly snapshot of '/mnt/sub' in '/mnt/rosnap'
     # stat /mnt/rosnap/dir
     	File: `/mnt/rosnap/dir'
     	Size: 8         Blocks: 0          IO Block: 4096   directory
     Device: 16h/22d    Inode: 257         Links: 1
     Access: (0755/drwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
     	Access: 2013-09-11 07:21:49.389157126 -0400
     	Modify: 2013-09-11 07:22:02.330156079 -0400
     	Change: 2013-09-11 07:22:02.330156079 -0400
     # ls /mnt/rosnap/dir
     	file
     # stat /mnt/rosnap/dir
     	File: `/mnt/rosnap/dir'
     	Size: 8         Blocks: 0          IO Block: 4096   directory
     Device: 16h/22d    Inode: 257         Links: 1
     Access: (0755/drwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
     	Access: 2013-09-11 07:22:56.797151670 -0400
     	Modify: 2013-09-11 07:22:02.330156079 -0400
     	Change: 2013-09-11 07:22:02.330156079 -0400
    Reported-by: NKoen De Wit <koen.de.wit@oracle.com>
    Signed-off-by: NGuangyu Sun <guangyu.sun@oracle.com>
    Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
    Signed-off-by: NChris Mason <chris.mason@fusionio.com>
    93fd63c2
inode.c 230.0 KB