Date: Thu, 21 Nov 2019 16:30:29 GMT From: Martin Simmons <martin@lispworks.com> To: Borja Marcos <borjam@sarenet.es> Cc: jbe-mlist@magnetkern.de, freebsd-fs@freebsd.org Subject: Re: ZFS snapdir readability (Crosspost) Message-ID: <201911211630.xALGUT5Z010705@higson.cam.lispworks.com> In-Reply-To: <462E2C53-2490-4B8C-BB54-BCE8B75BAEB0@sarenet.es> (message from Borja Marcos on Thu, 21 Nov 2019 14:46:04 %2B0100) References: <20191107004635.c6d2e7d464d3d556a0d87465@magnetkern.de> <CAOtMX2huHZcXHH%2B=3Bx7hX_p9udJ2acOX%2BZL8vW=pjqbe6mOAA@mail.gmail.com> <e2eecef7-21b6-0ff2-b259-71421b7d097c@sentex.net> <9B22AD46-BE87-4305-9638-74D23AD4C8CA@sarenet.es> <cfcc12dd-e9eb-5a98-a031-ab18436a2dd3@sentex.net> <261FE331-EC5C-48C8-9249-9BCBF887CE38@sarenet.es> <913f7040-6e38-452d-6187-e17fae63b652@sentex.net> <20191120144041.7f916360dc0c69bf509c9bd1@magnetkern.de> <AEF4CA02-36B3-42FC-BE92-14DF0AF99540@sarenet.es> <20191120163437.691abd369ab9c0a6d7d45ff2@magnetkern.de> <CF38B478-3638-4C18-B69F-E589DE9BBB95@sarenet.es> <20191120175803.03401c3316fe756cc46f79f1@magnetkern.de> <3C5DC6DD-C44B-41EE-B7AB-6D8F94E43174@sarenet.es> <201911211259.xALCxShX008743@higson.cam.lispworks.com> <462E2C53-2490-4B8C-BB54-BCE8B75BAEB0@sarenet.es>
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>>>>> On Thu, 21 Nov 2019 14:46:04 +0100, Borja Marcos said: > > > On 21 Nov 2019, at 13:59, Martin Simmons <martin@lispworks.com> wrote: > > > >>>>>> On Thu, 21 Nov 2019 13:12:04 +0100, Borja Marcos said: > >> > >> What I mean is, there is no snapshot mount functionality. If you want to access the > >> contents of a snapshot you either rollback it or you clone it. There is no > >> mount. > > > > I think that is incorrect. You can mount a snapshot on /mnt like this: > > > > /sbin/mount -t zfs filesystem@snapname /mnt > > I’ve never seen that and, indeed, on FreeBSD 12.1 it’s not possible. Or I am terribly > sloppy today! > > Did I miss anything? Is it a new ZFS on Linux feature? > > > root@micro1:~ # mount -t zfs -o ro pool/dataset@snapshot /mnt > mount: unpul/wwwnfsen@antesinst: Device busy > root@micro1:~ # It looks like unpul/wwwnfsen@antesinst is already mounted -- probably in .zfs :-) __Martin
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