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author | mckusick <mckusick@FreeBSD.org> | 2003-05-07 18:27:09 +0000 |
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committer | mckusick <mckusick@FreeBSD.org> | 2003-05-07 18:27:09 +0000 |
commit | 2e1c393dfc9eb11b05e093718baa11cd6a695a7d (patch) | |
tree | a7524c265464698a3f6530ac94f5bfd5c18248e7 /sbin/dumpon | |
parent | 1d8f58ae39f8fac245c251478decd0c1cae5c402 (diff) | |
download | FreeBSD-src-2e1c393dfc9eb11b05e093718baa11cd6a695a7d.zip FreeBSD-src-2e1c393dfc9eb11b05e093718baa11cd6a695a7d.tar.gz |
Dump is hard-wired to believe that it can read disks on
1024-byte boundaries. For many years this was a reasonable
assumption. However, in recent years we have begun seeing
devices with 2048-byte sectors. These devices return errors
when dump tries to read starting in the middle of a sector
or when it tries to read only the first half of a sector.
Rather than change the native block size used by dump (and
thus create an incompatible dump format), this fix checks
for transfer requests that start and/or end on a non-sector
boundary. When such a read is detected, the new code reads
the entire sector and copies out just the part that dump
needs.
Reviewed by: Poul-Henning Kamp <phk@critter.freebsd.dk>
Approved by: re (John Baldwin <jhb@FreeBSD.org>)
Sponsored by: DARPA & NAI Labs.
Diffstat (limited to 'sbin/dumpon')
0 files changed, 0 insertions, 0 deletions