Date: Wed, 20 Oct 2004 14:43:58 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-current@freebsd.org Subject: Re: Read-only ReiserFS support for FreeBSD 5.x Message-ID: <1098276238.41765d8ebfc0b@netchild.homeip.net> In-Reply-To: <20041019202047.GB83510@dan.emsphone.com> References: <417538B9.7070001@club-internet.fr> <41755FAF.8080300@colleduc.ee> <53515.208.4.77.15.1098213002.squirrel@208.4.77.15> <20041019202047.GB83510@dan.emsphone.com>
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Zitat von Dan Nelson <dnelson@allantgroup.com>: > Journalled filesystems may guarantee that the filesystem will be > consistent to a particular point in time, so if your editor updates > (for example) rc.conf by creating a new copy named rc.conf.new, > deleting rc.conf, then renaming the copy to rc.conf, you are guaranteed > that either rc.conf or rc.conf.new will be in the filessytem after a > crash. With softupdates, you may lose both files. I don't know if > current journalled fses actually journal all writes like this (as > opposed to just journalling what the OS decides to flush out of its > cache), but they are much less likely to lose files the way softupdates > can. Sorry, this isn't true. Renaming a directory entry is an atomar operation. Not only "man 2 rename" tells you about it, the softupdates algorithm guarantees this too. If you move/rename an entry into another directory, you may have both entries with the same content, but you won't loose both. Bye, Alexander. -- http://www.Leidinger.net/ Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org/ netchild @ FreeBSD.org : PGP ID = 72077137 This novel is not to be tossed lightly aside, but to be hurled with great force. -- Dorothy Parker
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