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MFC rev. 1.147

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Fix a DIV0 in case a large value for fs_avgfilesize or fs_avgfpdir
  is given (with newfs or tunefs) and dirsize overflows.

  In case dirsize is <= 0 because of an overflow set maxcontigdirs
  to 0 so it will be 1 later. This is what would happen for large
  fs_avgfilesize. [1]

  Submitted by:                   pjd [1]
This commit is contained in:
bz 2007-09-24 13:39:06 +00:00
parent 37617c42be
commit 4b73c7f73d
1 changed files with 4 additions and 1 deletions
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5
sys/ufs/ffs/ffs_alloc.c
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@ -1072,7 +1072,10 @@ ffs_dirpref(pip)
curdirsize = avgndir ? (cgsize - avgbfree * fs->fs_bsize) / avgndir : 0;
if (dirsize < curdirsize)
dirsize = curdirsize;
maxcontigdirs = min((avgbfree * fs->fs_bsize) / dirsize, 255);
if (dirsize <= 0)
maxcontigdirs = 0; /* dirsize overflowed */
else
maxcontigdirs = min((avgbfree * fs->fs_bsize) / dirsize, 255);
if (fs->fs_avgfpdir > 0)
maxcontigdirs = min(maxcontigdirs,
fs->fs_ipg / fs->fs_avgfpdir);