Messages in this thread |  | | | Date | Fri, 16 Jan 2009 09:40:29 -0600 | | From | Eric Sandeen <> | | Subject | Re: [PATCH] Allow SysRq emergency sync to thaw frozen filesystems |
| |
Valdis.Kletnieks@vt.edu wrote: > On Thu, 15 Jan 2009 21:59:10 CST, Eric Sandeen said: > >> Oh, actually, I'd think not. If the freeze was done properly by the >> filesystem, all data was flushed, the fs was quiesced, and new IO was >> blocked. pdflush should never be visiting these... > > Yes, but a lot of 'if's - and usually you're reaching for sysrq-S precisely > *because* you suspect that stuff wasn't happening properly on its own...
Actually, only one if - if the fs implemented freeze properly.
Well, the use case I envision here is something like:
# freeze /my/mount/point/to/fs/to/snapshot
except oops, that wasn't mounted, and you just froze your root fs.
I was thinking more recovery from admin error, not programming error...
If we're using sysrq to work around any possible programming error, then we have a pretty tough job to make sure that it always works, no?
-Eric
|  |