xfs: improve dquot iteration for scrub

Source kernel commit: 21d7500929c8a0b10e22a6755850c6f9a9280284

Upon a closer inspection of the quota record scrubber, I noticed that
dqiterate wasn't actually walking all possible dquots for the mapped
blocks in the quota file.  This is due to xfs_qm_dqget_next skipping all
XFS_IS_DQUOT_UNINITIALIZED dquots.

For a fsck program, we really want to look at all the dquots, even if
all counters and limits in the dquot record are zero.  Rewrite the
implementation to do this, as well as switching to an iterator paradigm
to reduce the number of indirect calls.

This enables removal of the old broken dqiterate code from xfs_dquot.c.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>

diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index f16974126ff929d2669ccc9f7bf76ba3dc277d7a..e6ca188e2271256c22254c64d5d99a436d62ffc7 100644 (file)
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -1272,6 +1272,9 @@ static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
 #define XFS_DQ_GRACE_MIN               ((int64_t)0)
 #define XFS_DQ_GRACE_MAX               ((int64_t)U32_MAX)
 
+/* Maximum id value for a quota record */
+#define XFS_DQ_ID_MAX                  (U32_MAX)
+
 /*
  * This is the main portion of the on-disk representation of quota information
  * for a user.  We pad this with some more expansion room to construct the on