Btrfs: avoid sleeping in verify_parent_transid while atomic

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verify_parent_transid needs to lock the extent range to make
sure no IO is underway, and so it can safely clear the
uptodate bits if our checks fail.

But, a few callers are using it with spinlocks held.  Most
of the time, the generation numbers are going to match, and
we don't want to switch to a blocking lock just for the error
case.  This adds an atomic flag to verify_parent_transid,
and changes it to return EAGAIN if it needs to block to
properly verifiy things.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2012-05-06 07:23:47 -04:00

parent ea9947b439

commit b9fab919b7

5 changed files with 34 additions and 17 deletions

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26

fs/btrfs/ctree.c

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18

fs/btrfs/disk-io.c

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3

fs/btrfs/disk-io.h

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2

fs/btrfs/extent-tree.c

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2

fs/btrfs/tree-log.c

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