On Fri, 26 Dec 2003 18:04:14 -0700, Monique Y. Herman wrote: > On Fri, 26 Dec 2003 at 23:59 GMT, Paul Morgan penned: >> > > Thank you for taking the time to respond, but the above was already > pretty clear to me. What's not clear to me are the following points: > Sorry, my fault.
> Since the 'auto' type for mount looks at the superblock, will an ext3 > partition mounted as 'auto' be used as ext2, ie, without journalling? > (I'm guessing the answer is 'yes', but I'd still feel more warm and > fuzzy with a confirmation.) No. If your kernel groks ext3, it will try ext3 before ext2. > > Does the presence of the has_journal option imply that the driver in use > is ext3, or only that the partition itself has ext3 features, regardless > of whether they're being used? I'm guessing the answer is "the latter," > and that the presence of the has_journal feature does not have any > bearing on whether the ext2 or ext3 driver is being used, but again, a > confirmation would make me feel better. > > Or, as an experimental solution to both of the above questions, how > would I go about determining whether an ext3 partition mounted as type > 'auto' is using the ext2 or ext3 driver? > Example: I just changed my root fstab entry from: /dev/hda2 / ext3 defaults,data=journal,errors=remount-ro 1 0 to: /dev/hda2 / auto defaults,data=journal,errors=remount-ro 1 0 ...and rebooted. Before reboot, "mount" tells me: /dev/ide/host0/bus0/target0/lun0/part2 on / type ext3 (rw,data=journal,errors=remount-ro) After reboot: /dev/ide/host0/bus0/target0/lun0/part2 on / type auto (rw,data=journal,errors=remount-ro) however, /var/log/syslog tells me that root was mounted as ext3: Dec 27 05:12:05 pooh kernel: Mounted devfs on /dev Dec 27 05:12:05 pooh kernel: Freeing unused kernel memory: 132k freed Dec 27 05:12:05 pooh kernel: kjournald starting. Commit interval 5 seconds Dec 27 05:12:05 pooh kernel: EXT3-fs: mounted filesystem with journal data mode. Another example: pooh:~# mount ... /dev/vgusr/lvsrc on /usr/src type ext3 (rw,data=journal) ...after unmounting /usr/src, changing fstab from ext3 to auto, and remounting: /dev/vgusr/lvsrc on /usr/src type ext3 (rw,data=journal) >> >> I use exclusively ext3 but just for you I created an ext2 example :) > > I have all of my partitions formatted as ext3, but in researching the > original poster's question I discovered that I had for some reason put > 'auto' in my fstab for the root partition (but not the others), leading > to the above questions. Here's a good place to start reading (I give the two links because there's not a link from the first page to the second, at least I didn't see one. The second page describes ext3 journalling options. http://www-106.ibm.com/developerworks/linux/library/l-fs7/ http://www-106.ibm.com/developerworks/linux/library/l-fs8/ -- ....................paul It's working as coded. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
