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commit 263b53767a3df33f392262f539bfb35ec578f5e5
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Author: Eric Sandeen <sandeen@redhat.com>
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Date: Thu Nov 13 10:02:22 2014 +1100
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xfs_copy: simplify first_agbno calculation
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After ffe9a9a xfsprogs: xfs_copy: fix data corruption of target,
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xfs_copy started hitting an ASSERT for a 4k sector / 4k blocksize
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filesystem:
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# dd if=/dev/zero of=test.img bs=1M count=1024
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# mkfs.xfs -s size=4096 test.img
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# xfs_copy test.img xfs.img
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xfs_copy: xfs_copy.c:720: main: Assertion `((((((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) + 1) * (1<<9)) + first_residue) % source_blocksize) == 0' failed.
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Aborted
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I started digging through all the calculations below, and realized
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that in the end, all it wants is the first filesystem block after
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the AG header. XFS_AGFL_BLOCK(mp) + 1 suffices for this purpose;
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rip out the rest which seems overly complex and apparently bug-prone.
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I tested this by creating a 4g filesystem with combinations of
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sector & block size between 512 and 4k, copying in /lib/modules,
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running an xfs_copy of that, and running repair against the copy;
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it all looks good. It took a long time, but I will create a
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simpler/shorter xfstest based on this.
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Reported-by: Zorro Lang <zlang@redhat.com>
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Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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Reviewed-by: Brian Foster <bfoster@redhat.com>
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Signed-off-by: Dave Chinner <david@fromorbit.com>
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diff --git a/copy/xfs_copy.c b/copy/xfs_copy.c
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index 7ce5ec9..279527c 100644
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--- a/copy/xfs_copy.c
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+++ b/copy/xfs_copy.c
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@@ -475,7 +475,7 @@ main(int argc, char **argv)
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int open_flags;
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xfs_off_t pos, end_pos;
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size_t length;
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- int c, first_residue, tmp_residue;
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+ int c;
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__uint64_t size, sizeb;
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__uint64_t numblocks = 0;
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int wblocks = 0;
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@@ -697,27 +697,13 @@ main(int argc, char **argv)
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ASSERT(source_blocksize % source_sectorsize == 0);
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ASSERT(source_sectorsize % BBSIZE == 0);
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- if (source_blocksize > source_sectorsize) {
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- /* get number of leftover sectors in last block of ag header */
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-
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- tmp_residue = ((XFS_AGFL_DADDR(mp) + 1) * BBSIZE)
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- % source_blocksize;
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- first_residue = (tmp_residue == 0) ? 0 :
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- source_blocksize - tmp_residue;
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- ASSERT(first_residue % source_sectorsize == 0);
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- } else if (source_blocksize == source_sectorsize) {
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- first_residue = 0;
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- } else {
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+ if (source_blocksize < source_sectorsize) {
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do_log(_("Error: filesystem block size is smaller than the"
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" disk sectorsize.\nAborting XFS copy now.\n"));
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exit(1);
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}
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- first_agbno = (((XFS_AGFL_DADDR(mp) + 1) * BBSIZE)
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- + first_residue) / source_blocksize;
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- ASSERT(first_agbno != 0);
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- ASSERT(((((XFS_AGFL_DADDR(mp) + 1) * BBSIZE)
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- + first_residue) % source_blocksize) == 0);
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+ first_agbno = XFS_AGFL_BLOCK(mp) + 1;
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/* now open targets */
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