-------- Original Message --------
Subject: Re: RFE: per-subvolume timestamp that is updated on every
change to a subvolume
From: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
To: Lennart Poettering <lennart@xxxxxxxxxxxxxx>,
<linux-btrfs@xxxxxxxxxxxxxxx>
Date: 2015年01月06日 14:02
-------- Original Message --------
Subject: RFE: per-subvolume timestamp that is updated on every change
to a subvolume
From: Lennart Poettering <lennart@xxxxxxxxxxxxxx>
To: <linux-btrfs@xxxxxxxxxxxxxxx>
Date: 2015年01月06日 01:27
Heya!
I am looking for a nice way to query the overall last modification
timestamp of a subvolume. i.e. the most recent mtime of *any* file or
directory within a subvolume. Ideally, I think, there was a
btrfs_timespec field for this in "struct btrfs_root_item", alas there
isn't afaics. Any chance this can be added?
In fact, btrfs_root_item contains one btrfs_inode_item, which contains
the a/c/m/otime.
But not sure if it contains the time you need.
I'd better add acmotime output for inode_item in btrfs-debug-tree and
try myself.
Thanks,
Qu
The value in acmotime of the inode_item in root_item is not used,
so it seems anyone can use it to record the acmotime for your purpose.
Thanks,
Qu
Or is there another workable way to query this value? Maybe determine
it from the current generation of a subvolume or so? Is that tracked?
Ideas?
Lennart
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