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From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Mon, 14 Jan 2002 23:17:13 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern vfs_subr.c src/sys/ufs/ffs ffs_inode.c
         ffs_vfsops.c src/sys/ufs/ufs ufs_inode.c ufs_vnops.c
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mckusick    2002/01/14 23:17:13 PST

  Modified files:
    sys/kern             vfs_subr.c 
    sys/ufs/ffs          ffs_inode.c ffs_vfsops.c 
    sys/ufs/ufs          ufs_inode.c ufs_vnops.c 
  Log:
  When downgrading a filesystem from read-write to read-only, operations
  involving file removal or file update were not always being fully
  committed to disk. The result was lost files or corrupted file data.
  This change ensures that the filesystem is properly synced to disk
  before the filesystem is down-graded.
  
  This delta also fixes a long standing bug in which a file open for
  reading has been unlinked. When the last open reference to the file
  is closed, the inode is reclaimed by the filesystem. Previously,
  if the filesystem had been down-graded to read-only, the inode could
  not be reclaimed, and thus was lost and had to be later recovered
  by fsck.  With this change, such files are found at the time of the
  down-grade.  Normally they will result in the filesystem down-grade
  failing with `device busy'. If a forcible down-grade is done, then
  the affected files will be revoked causing the inode to be released
  and the open file descriptors to begin failing on attempts to read.
  
  Submitted by:   "Sam Leffler" <sam@errno.com>
  
  Revision  Changes    Path
  1.338     +7 -2      src/sys/kern/vfs_subr.c
  1.74      +4 -2      src/sys/ufs/ffs/ffs_inode.c
  1.167     +8 -0      src/sys/ufs/ffs/ffs_vfsops.c
  1.40      +2 -2      src/sys/ufs/ufs/ufs_inode.c
  1.182     +4 -5      src/sys/ufs/ufs/ufs_vnops.c

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