lost+found dir placement
Hi, Each fs should have its own lost+found directory. It is used by fsck for placing recovered corrupted fs files in there. This implies the dir must have already existed (it may not be mounted ad hoc e.g. at boot time, during fs recovery). In FreeBSD 9, I found lost+found dir under /mnt. This is incorrect - /mnt is defined under all standards (Filesystem Hierarchy Standard, Unix directory structure) as contains filesystem mount points. So, lost+found dir should exist under root dir as /lost+found. Any comments before I file a PR request ? jb ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: lost+found dir placement
On Tue, Mar 13, 2012 at 2:58 AM, jb jb.1234a...@gmail.com wrote: Hi, Each fs should have its own lost+found directory. It is used by fsck for placing recovered corrupted fs files in there. This implies the dir must have already existed (it may not be mounted ad hoc e.g. at boot time, during fs recovery). In FreeBSD 9, I found lost+found dir under /mnt. This is incorrect - /mnt is defined under all standards (Filesystem Hierarchy Standard, Unix directory structure) as contains filesystem mount points. So, lost+found dir should exist under root dir as /lost+found. Any comments before I file a PR request ? jb The directory is created in the top of the filesystem, so you should check what is mounted on /mnt. Filesystem Hierarchy Standard -- This is a Linux standard. For info on FreeBSD hierarchy see man hier(7) -- Adam Vande More ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: lost+found dir placement
On Tue, 13 Mar 2012 07:58:09 + (UTC), jb wrote: Hi, Each fs should have its own lost+found directory. It is used by fsck for placing recovered corrupted fs files in there. Correct. This implies the dir must have already existed (it may not be mounted ad hoc e.g. at boot time, during fs recovery). No. This implication does not exist. If I read /usr/src/sbin/fsck_ffs/dir.c correctly, the lost+found/ directory will be created by fsck if it is required and _not_ present. It will do so on a inode based method (instead of utilizing a file system oriented call to make a directory). This is a requirement because (as you correctly mentioned) the partition checked will not be writable (or even be mounted), so mkdir() and related fs functions cannot be used. Also see an evidence for that idea in man fsck_ffs. In FreeBSD 9, I found lost+found dir under /mnt. This is incorrect - /mnt is defined under all standards (Filesystem Hierarchy Standard, Unix directory structure) as contains filesystem mount points. According to man hier (mandatory for interpreting the file system hierarchy on FreeBSD) this your assumption sounds correct: /mnt is explained to be an empty directory commonly used by system administrators as a temporary mount point, so having a lost+found/ directory in there doesn't seem to have any purpose and looks wrong. So, lost+found dir should exist under root dir as /lost+found. Correct. It will be assigned to the results of possible recoveries of lost data of the / partition correctly. Any comments before I file a PR request ? If this directory has been created by the installation process, I think you should. Maybe you verify the issue on the freebsd-fs@ list? -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: lost+found dir placement
jb jb.1234a...@gmail.com wrote: Hi, Each fs should have its own lost+found directory. It is used by fsck for placing recovered corrupted fs files in there. This implies the dir must have already existed (it may not be mounted ad hoc e.g. at boot time, during fs recovery). In FreeBSD 9, I found lost+found dir under /mnt. This is incorrect - /mnt is defined under all standards (Filesystem Hierarchy Standard, Unix directory structure) as contains filesystem mount points. So, lost+found dir should exist under root dir as /lost+found. Do you have a filesystem mounted on /mnt? Any comments before I file a PR request ? The fsck_ffs manpage says that 'lost+found' is _created_ *when*needed*, in the root of a filesystem, if not already present. The presense of /mnt/lost+found is _not_ an error. just a surperfluous file that ended up there 'somehow'. *IF* you're going to file a PR, it should be for the filesystem initialization process -- which should (a) create the lost+found directory, (b) create some 'reasonable' number of files in that directory, and (c) then delete all those files. This ensures that the directory exists and has disk-space allocated for a 'reasonable' number of 'recovered' file entries. The existing fsck_ffs has a catastrophic failure mode if there is no space on the disk for the lost+found directory to grow to acomodate the recovered file entries. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
