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| author | mckusick <mckusick@FreeBSD.org> | 2003-05-07 18:27:09 +0000 |
|---|---|---|
| committer | mckusick <mckusick@FreeBSD.org> | 2003-05-07 18:27:09 +0000 |
| commit | 2e1c393dfc9eb11b05e093718baa11cd6a695a7d (patch) | |
| tree | a7524c265464698a3f6530ac94f5bfd5c18248e7 /sbin/dump/main.c | |
| 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/dump/main.c')
| -rw-r--r-- | sbin/dump/main.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sbin/dump/main.c b/sbin/dump/main.c index 6866eb7..54ac7f0 100644 --- a/sbin/dump/main.c +++ b/sbin/dump/main.c @@ -388,6 +388,7 @@ main(int argc, char *argv[]) sync(); sblock = (struct fs *)sblock_buf; for (i = 0; sblock_try[i] != -1; i++) { + sblock->fs_fsize = SBLOCKSIZE; /* needed in bread */ bread(sblock_try[i] >> dev_bshift, (char *) sblock, SBLOCKSIZE); if ((sblock->fs_magic == FS_UFS1_MAGIC || (sblock->fs_magic == FS_UFS2_MAGIC && |
