-------- 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
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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