Re: RFE: per-subvolume timestamp that is updated on every change to a subvolume
Original Message Subject: Re: RFE: per-subvolume timestamp that is updated on every change to a subvolume From: Qu Wenruo quwen...@cn.fujitsu.com To: Lennart Poettering lenn...@poettering.net, linux-btrfs@vger.kernel.org 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 lenn...@poettering.net To: linux-btrfs@vger.kernel.org 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 -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RFE: per-subvolume timestamp that is updated on every change to a subvolume
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? 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 -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: RFE: per-subvolume timestamp that is updated on every change to a subvolume
Original Message Subject: RFE: per-subvolume timestamp that is updated on every change to a subvolume From: Lennart Poettering lenn...@poettering.net To: linux-btrfs@vger.kernel.org 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 -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
