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From: Andriy Gapon <avg@FreeBSD.org>
Date: Thu, 20 Aug 2009 11:04:31 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/usr.bin/fstat fstat.c zfs.c
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avg         2009-08-20 11:04:31 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    usr.bin/fstat        fstat.c zfs.c 
  Log:
  SVN rev 196400 on 2009-08-20 11:04:31Z by avg
  
  MFC 196399: fstat: fix fsid comparison when executed on systems with 64-bit long
  
  This affects only fstat on zfs and devfs, only on 64-bit systems
  and only when fsid is greater than 2^31 - 1.
  When fstat examines a file via stat(2) it takes uint32_t st_dev
  and assigns to (signed) (64-bit) long fsid, this results in
  a positive value.
  When fstat examines opened files it takes int32_t f_fsid.val[0]
  and assigns to (signed) (64-bit) long fsid, this results in
  a negative value.
  So, while initially st_dev and f_fsid.val[0] have the same bit
  values they get promoted to different 64-bit values because
  of the signed-vs-unsigned difference.
  
  A fix is to use "more natural" positive numbers by introducing
  intermediate unsigned cast for f_fsid.val[0].
  
  Reviewed by:    jhb, lulf
  Approved by:    re (kib)
  MFC after:      1 week (to stable/7)
  
  Revision  Changes    Path
  1.71.2.2  +1 -1      src/usr.bin/fstat/fstat.c
  1.8.4.2   +1 -1      src/usr.bin/fstat/zfs.c