Create xfs_inobt_rec_exists() to receive the parameters of a new sparse
inode chunk allocation and identify whether a record exists that is
capable of tracking this sparse chunk.
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_ialloc.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index b53fb5d..6879213 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -359,6 +359,67 @@ xfs_ialloc_inode_init(
}
/*
+ * Determine whether part of a sparse inode chunk that has just been allocated
+ * is covered by an existing inobt record.
+ */
+STATIC int
+xfs_inobt_rec_exists(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_buf *agbp,
+ xfs_agino_t newino,
+ xfs_agino_t count,
+ xfs_btnum_t btnum,
+ struct xfs_inobt_rec_incore *orec)
+{
+ struct xfs_btree_cur *cur;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
+ xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
+ int error;
+ int i;
+ struct xfs_inobt_rec_incore rec;
+
+ orec->ir_startino = NULLAGINO;
+
+ cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, btnum);
+
+ /*
+ * Find the first record prior to the inode that has just been
+ * allocated.
+ */
+ error = xfs_inobt_lookup(cur, newino, XFS_LOOKUP_LE, &i);
+ if (error)
+ goto error;
+ if (i == 0)
+ goto out;
+
+ error = xfs_inobt_get_rec(cur, &rec, &i);
+ if (error)
+ goto error;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error);
+
+ /*
+ * Check whether the record covers a range that includes the new inodes.
+ * We can't allocate a sparse chunk that spans multiple records, so we
+ * only need to check the ino range.
+ */
+ if (rec.ir_startino + XFS_INODES_PER_CHUNK <= newino)
+ goto out;
+
+ ASSERT(rec.ir_startino <= newino &&
+ rec.ir_startino + XFS_INODES_PER_CHUNK > newino);
+
+ *orec = rec; /* struct copy */
+
+out:
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ return 0;
+error:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
* Allocate new inodes in the allocation group specified by agbp.
* Return 0 for success, else error code.
*/
--
1.8.3.1
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