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Take care not to issue unaligned I/O requests while tasting a provider.

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des 2005-02-08 08:04:23 +00:00
parent 3e12d206d6
commit 4edf9621a3
1 changed files with 10 additions and 0 deletions
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10
sys/geom/geom_vol_ffs.c
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@ -88,6 +88,16 @@ g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
* provider based on that.
*/
for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
/*
* Take care not to issue an invalid I/O request. The
* offset and size of the superblock candidate must be
* multiples of the provider's sector size, otherwise an
* FFS can't exist on the provider anyway.
*/
if (superblock % cp->provider->sectorsize != 0 ||
SBLOCKSIZE % cp->provider->sectorsize != 0)
continue;
fs = (struct fs *) g_read_data(cp, superblock,
SBLOCKSIZE, &error);
if (fs == NULL || error != 0)