Btrfs: fail to mount if we have problems reading the block groups

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We don't actually check the return value of btrfs_read_block_groups, so we can
possibly succeed to mount, but then fail to say read the superblock xattr for
selinux which will cause the vfs code to deactivate the super.

This is a problem because in find_free_extent we just assume that we
will find the right space_info for the allocation we want.  But if we
failed to read the block groups, we won't have setup any space_info's,
and we'll hit a NULL pointer deref in find_free_extent.

This patch fixes that problem by checking the return value of
btrfs_read_block_groups, and failing out properly.  I've also added a
check in find_free_extent so if for some reason we don't find an
appropriate space_info, we just return -ENOSPC.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Josef Bacik 2010-03-19 20:49:55 +00:00 • committed by Chris Mason

parent 6cf8bfbf5e

commit 1b1d1f6625

2 changed files with 12 additions and 4 deletions

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11

fs/btrfs/disk-io.c

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5

fs/btrfs/extent-tree.c

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