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 From : Slawa Olhovchenkov                   2:5030/500     06 Oct 2007  16:30:16
 To : All
 Subject : вести с полей
 -------------------------------------------------------------------------------- 
 

 
 bde         2007-07-23 07:10:17 UTC
 
   FreeBSD src repository
 
   Modified files:
     sys/fs/msdosfs       msdosfs_vfsops.c
   Log:
   Make using msdosfs as the root file system sort of work:
 
   o Initialize ownerships and permissions.  They were garbage (0) for
     root mounts since vfs_mountroot_try() doesn't ask for them to be set
     and msdosfs's old incomplete code to set them was removed.  The
     garbage happened to give the correct ownerships root:wheel, but it
     gave permissions 000 so init could not be execed.  Use the macros
     for root: wheel and 0755.  (The removed code gave 0:0 and 0777.  0755
     is more normal and secure, thought wrong for /tmp.)
 
   o Check the readonly flag for initial (non-MNT_UPDATE) mounts in the
     correct place, as in ffs.  For root mounts, it is only passed in
     mp->mnt_flags, since vfs_mountroot_try() only passes it as a flag
     and nothing translates the flag to the "ro" option string.  msdosfs
     only looked for it in the string, so it gave a rw mount for root
     mounts without even clearing the flag in mp->mnt_flags, so the final
     state was inconsistent.  Checking the flag only in mp->mnt_flags
     works for initial userland mounts too.  The MNT_UPDATE case is
     messier.
 
   The main point that should work but doesn't is fsck of msdosfs root
   while it is mounted ro.  This needs mainly MNT_RELOAD support to work.
   It should be possible to run fsck -p and succeed provided the fs is
   consistent, not just for msdosfs, but this fails because fsck -p always
   tries to open the device rw.  The hack that allows open for writing
   in ffs is not implemented in msdosfs, since without MNT_RELOAD support
   writing could only be harmful.  So fsck must be turned off to use
   msdosfs as root.  This is quite dangerous, since msdosfs is still missing
   actually using its fs-dirty flag internally, so it is happy to mount
   dirty fileystems rw.
 
   Unrelated changes:
   - Fix missing error handling for MNT_UPDATE from rw to ro.
   - Catch up with renaming msdos to msdosfs in a string.
 
   Approved by:    re (kensmith)
 ... А я подкpался незаметно! (c) СамиЗнаетеКто
 --- GoldED+/BSD 1.1.5
  * Origin:  (2:5030/500)
 
 

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