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phoenix |
Changes by Matija Nalis (mnalis@jagor.srce.hr) on umsdos dentry fixing
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(started by Peter T. Waltenberg )
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(Final conversion to dentries Bill Hawes )
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There is no warning any more.
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Both read-only and read-write stuff is fixed, both in
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msdos-compatibile mode, and in umsdos EMD mode, and it seems stable.
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Userland NOTE: new umsdos_progs (umssync, umssetup, udosctl & friends) that
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will compile and work on 2.2.x+ kernels and glibc based systems, as well as
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kernel patches and other umsdos related information may be found at
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http://linux.voyager.hr/umsdos/
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Information below is getting outdated slowly -- I'll fix it one day when I
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get enough time - there are more important things to fix right now.
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Legend: those lines marked with '+' on the beggining of line indicates it
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passed all of my tests, and performed perfect in all of them.
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Current status (010125) - UMSDOS 0.86j:
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(1) pure MSDOS (no --linux-.--- EMD file):
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READ:
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+ readdir - works
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+ lookup - works
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+ read file - works
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WRITE:
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+ creat file - works
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+ unlink file - works
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+ write file - works
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+ rename file (same dir) - works
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+ rename file (dif. dir) - works
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+ rename dir (same dir) - works
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+ rename dir (dif. dir) - works
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+ mkdir - works
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+ rmdir - works
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(2) umsdos (with --linux-.--- EMD file):
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READ:
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+ readdir - works
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+ lookup - works
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+ permissions/owners stuff - works
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+ long file names - works
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+ read file - works
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+ switching MSDOS/UMSDOS - works
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+ switching UMSDOS/MSDOS - works
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- pseudo root things - works mostly. See notes below.
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+ resolve symlink - works
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+ dereference symlink - works
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+ dangling symlink - works
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+ hard links - works
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+ special files (block/char devices, FIFOs, sockets...) - works
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+ various umsdos ioctls - works
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WRITE:
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+ create symlink - works
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+ create hardlink - works
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+ create file - works
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+ create special file - works
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+ write to file - works
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+ rename file (same dir) - works
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+ rename file (dif. dir) - works
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+ rename hardlink (same dir) - works
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- rename hardlink (dif. dir) - works, but see notes below.
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+ rename symlink (same dir) - works
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+ rename symlink (dif. dir) - works
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+ rename dir (same dir) - works
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+ rename dir (dif. dir) - works
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+ unlink file - works
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+ notify_change (chown,perms) - works
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+ notify_change for hardlinks - works
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+ unlink hardlink - works
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+ mkdir - works
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+ rmdir - works
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+ umssyncing (many ioctls) - works
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- CVF-FAT stuff (compressed DOS filesystem) - there is some support from Frank
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Gockel to use it even under umsdosfs, but I
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have no way of testing it -- please let me know if there are problems specific
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to umsdos (for instance, it works under msdosfs, but not under umsdosfs).
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Some current notes:
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Note: creating and using pseudo-hardlinks is always non-perfect, especially
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in filesystems that might be externally modified like umsdos. There is
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example is specs file about it. Specifically, moving directory which
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contains hardlinks will break them.
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Note: (about creating hardlinks in pseudoroot mode) - hardlinks created in
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pseudoroot mode are now again compatibile with 'normal' hardlinks, and vice
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versa. Thanks to Sorin Iordachescu for providing fix.
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See http://linux.voyager.hr/umsdos/hlbug.html for more info and upgrade
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procedure if you used broken versions...
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------------------------------------------------------------------------------
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Some general notes:
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Good idea when running development kernels is to have SysRq support compiled
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in kernel, and use Sync/Emergency-remount-RO if you bump into problems (like
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not being able to umount(2) umsdosfs, and because of it root partition also,
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or panics which force you to reboot etc.)
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I'm unfortunately somewhat out of time to read linux-kernel@vger, but I do
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check for messages having "UMSDOS" in the subject, and read them. I might
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miss some in all that volume, though. I should reply to any direct e-mail
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in few days. If I don't, probably I never got your message.
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