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dnode_read: handle hole blocks in zfs boot code

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A hole block pointer can be encountered at any level and the hole
can cover multiple data blocks, but we are reading the data blocks
one by one, so we care only about the current one.

PR:		199804
Reported by:	Toomas Soome <tsoome@me.com>
Submitted by:	Toomas Soome <tsoome@me.com> (earlier version)
Tested by:	Toomas Soome <tsoome@me.com>
MFC after:	11 days
This commit is contained in:
Andriy Gapon 2015-06-05 15:32:04 +00:00
parent 2764d3bcdb
commit dade6e27ab
1 changed files with 4 additions and 0 deletions
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4
sys/boot/zfs/zfsimpl.c
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@ -1255,6 +1255,10 @@ dnode_read(const spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf,
ibn = bn >> ((nlevels - i - 1) * ibshift);
ibn &= ((1 << ibshift) - 1);
bp = indbp[ibn];
if (BP_IS_HOLE(bp)) {
memset(dnode_cache_buf, 0, bsize);
break;
}
rc = zio_read(spa, &bp, dnode_cache_buf);
if (rc)
return (rc);