README-WIP.txt

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    1 Changes by Matija Nalis (mnalis@jagor.srce.hr) on umsdos dentry fixing
    2 (started by Peter T. Waltenberg <peterw@karaka.chch.cri.nz>)
    3 (Final conversion to dentries Bill Hawes <whawes@star.net>)
    4 
    5 There is no warning any more.
    6 Both read-only and read-write stuff is fixed, both in
    7 msdos-compatibile mode, and in umsdos EMD mode, and it seems stable.
    8 
    9 Userland NOTE: new umsdos_progs (umssync, umssetup, udosctl & friends) that
   10 will compile and work on 2.2.x+ kernels and glibc based systems, as well as
   11 kernel patches and other umsdos related information may be found at
   12 http://linux.voyager.hr/umsdos/
   13 
   14 Information below is getting outdated slowly -- I'll fix it one day when I
   15 get enough time - there are more important things to fix right now.
   16 
   17 Legend: those lines marked with '+' on the beggining of line indicates it
   18 passed all of my tests, and performed perfect in all of them.
   19 
   20 Current status (010125) - UMSDOS 0.86j:
   21 
   22 (1) pure MSDOS (no --linux-.--- EMD file):
   23 
   24 READ:
   25 + readdir                       - works
   26 + lookup                        - works
   27 + read file                     - works
   28 
   29 WRITE:
   30 + creat file                    - works
   31 + unlink file                   - works
   32 + write file                    - works
   33 + rename file (same dir)        - works
   34 + rename file (dif. dir)        - works
   35 + rename dir (same dir)         - works
   36 + rename dir (dif. dir)         - works
   37 + mkdir                         - works
   38 + rmdir                         - works
   39 
   40 
   41 (2) umsdos (with --linux-.--- EMD file):
   42 
   43 READ:
   44 + readdir                       - works
   45 + lookup                        - works
   46 + permissions/owners stuff      - works
   47 + long file names               - works
   48 + read file                     - works
   49 + switching MSDOS/UMSDOS        - works
   50 + switching UMSDOS/MSDOS        - works
   51 - pseudo root things            - works mostly. See notes below.
   52 + resolve symlink               - works
   53 + dereference symlink           - works
   54 + dangling symlink              - works
   55 + hard links                    - works
   56 + special files (block/char devices, FIFOs, sockets...) - works
   57 + various umsdos ioctls         - works
   58 
   59 
   60 WRITE:
   61 + create symlink                - works
   62 + create hardlink               - works
   63 + create file                   - works
   64 + create special file           - works
   65 + write to file                 - works
   66 + rename file (same dir)        - works
   67 + rename file (dif. dir)        - works
   68 + rename hardlink (same dir)    - works
   69 - rename hardlink (dif. dir)    - works, but see notes below.
   70 + rename symlink (same dir)     - works
   71 + rename symlink (dif. dir)     - works
   72 + rename dir (same dir)         - works
   73 + rename dir (dif. dir)         - works
   74 + unlink file                   - works
   75 + notify_change (chown,perms)   - works
   76 + notify_change for hardlinks   - works
   77 + unlink hardlink               - works
   78 + mkdir                         - works
   79 + rmdir                         - works
   80 + umssyncing (many ioctls)      - works
   81 
   82 
   83 - CVF-FAT stuff (compressed DOS filesystem) - there is some support from Frank
   84   Gockel <gockel@sent13.uni-duisburg.de> to use it even under umsdosfs, but I
   85   have no way of testing it -- please let me know if there are problems specific
   86   to umsdos (for instance, it works under msdosfs, but not under umsdosfs).
   87 
   88 
   89 Some current notes:
   90 
   91 Note: creating and using pseudo-hardlinks is always non-perfect, especially
   92 in filesystems that might be externally modified like umsdos. There is
   93 example is specs file about it. Specifically, moving directory which
   94 contains hardlinks will break them.
   95 
   96 Note: (about creating hardlinks in pseudoroot mode) - hardlinks created in
   97 pseudoroot mode are now again compatibile with 'normal' hardlinks, and vice
   98 versa. Thanks to Sorin Iordachescu <sorin@rodae.ro> for providing fix.
   99 See http://linux.voyager.hr/umsdos/hlbug.html for more info and upgrade
  100 procedure if you used broken versions...
  101 
  102 ------------------------------------------------------------------------------
  103 
  104 Some general notes:
  105 
  106 Good idea when running development kernels is to have SysRq support compiled
  107 in kernel, and use Sync/Emergency-remount-RO if you bump into problems (like
  108 not being able to umount(2) umsdosfs, and because of it root partition also,
  109 or panics which force you to reboot etc.)
  110 
  111 I'm unfortunately somewhat out of time to read linux-kernel@vger, but I do
  112 check for messages having "UMSDOS" in the subject, and read them.  I might
  113 miss some in all that volume, though.  I should reply to any direct e-mail
  114 in few days.  If I don't, probably I never got your message.

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FreeBSD/Linux Kernel Cross Reference sys/fs/umsdos/README-WIP.txt

FreeBSD/Linux Kernel Cross Reference
sys/fs/umsdos/README-WIP.txt