xfs: introduce CONFIG_XFS_WARN

[firefly-linux-kernel-4.4.55.git] / fs / xfs / xfs_btree.h

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index f932897194eb33b5be8d8131a98c1941fbea26e7..55e3c7cc3c3d3f22178fb1feb8aab44679821172 100644 (file)
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -42,11 +42,15 @@ extern kmem_zone_t  *xfs_btree_cur_zone;
  * Generic btree header.
  *
  * This is a combination of the actual format used on disk for short and long
- * format btrees.  The first three fields are shared by both format, but
- * the pointers are different and should be used with care.
+ * format btrees.  The first three fields are shared by both format, but the
+ * pointers are different and should be used with care.
  *
- * To get the size of the actual short or long form headers please use
- * the size macros below.  Never use sizeof(xfs_btree_block).
+ * To get the size of the actual short or long form headers please use the size
+ * macros below.  Never use sizeof(xfs_btree_block).
+ *
+ * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
+ * with the crc feature bit, and all accesses to them must be conditional on
+ * that flag.
  */
 struct xfs_btree_block {
        __be32          bb_magic;       /* magic number for block type */
@@ -56,10 +60,23 @@ struct xfs_btree_block {
                struct {
                        __be32          bb_leftsib;
                        __be32          bb_rightsib;
+
+                       __be64          bb_blkno;
+                       __be64          bb_lsn;
+                       uuid_t          bb_uuid;
+                       __be32          bb_owner;
+                       __le32          bb_crc;
                } s;                    /* short form pointers */
                struct  {
                        __be64          bb_leftsib;
                        __be64          bb_rightsib;
+
+                       __be64          bb_blkno;
+                       __be64          bb_lsn;
+                       uuid_t          bb_uuid;
+                       __be64          bb_owner;
+                       __le32          bb_crc;
+                       __be32          bb_pad; /* padding for alignment */
                } l;                    /* long form pointers */
        } bb_u;                         /* rest */
 };
@@ -67,6 +84,16 @@ struct xfs_btree_block {
 #define XFS_BTREE_SBLOCK_LEN   16      /* size of a short form block */
 #define XFS_BTREE_LBLOCK_LEN   24      /* size of a long form block */
 
+/* sizes of CRC enabled btree blocks */
+#define XFS_BTREE_SBLOCK_CRC_LEN       (XFS_BTREE_SBLOCK_LEN + 40)
+#define XFS_BTREE_LBLOCK_CRC_LEN       (XFS_BTREE_LBLOCK_LEN + 48)
+
+
+#define XFS_BTREE_SBLOCK_CRC_OFF \
+       offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
+#define XFS_BTREE_LBLOCK_CRC_OFF \
+       offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
+
 
 /*
  * Generic key, ptr and record wrapper structures.
@@ -101,13 +128,11 @@ union xfs_btree_rec {
 #define        XFS_BB_NUMRECS          0x04
 #define        XFS_BB_LEFTSIB          0x08
 #define        XFS_BB_RIGHTSIB         0x10
+#define        XFS_BB_BLKNO            0x20
 #define        XFS_BB_NUM_BITS         5
 #define        XFS_BB_ALL_BITS         ((1 << XFS_BB_NUM_BITS) - 1)
-
-/*
- * Magic numbers for btree blocks.
- */
-extern const __uint32_t        xfs_magics[];
+#define        XFS_BB_NUM_BITS_CRC     8
+#define        XFS_BB_ALL_BITS_CRC     ((1 << XFS_BB_NUM_BITS_CRC) - 1)
 
 /*
  * Generic stats interface
@@ -190,7 +215,7 @@ struct xfs_btree_ops {
 
        const struct xfs_buf_ops        *buf_ops;
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
        /* check that k1 is lower than k2 */
        int     (*keys_inorder)(struct xfs_btree_cur *cur,
                                union xfs_btree_key *k1,
@@ -256,6 +281,7 @@ typedef struct xfs_btree_cur
 #define XFS_BTREE_LONG_PTRS            (1<<0)  /* pointers are 64bits long */
 #define XFS_BTREE_ROOT_IN_INODE                (1<<1)  /* root may be variable size */
 #define XFS_BTREE_LASTREC_UPDATE       (1<<2)  /* track last rec externally */
+#define XFS_BTREE_CRC_BLOCKS           (1<<3)  /* uses extended btree blocks */
 
 
 #define        XFS_BTREE_NOERROR       0
@@ -393,8 +419,20 @@ xfs_btree_init_block(
        __u32           magic,
        __u16           level,
        __u16           numrecs,
+       __u64           owner,
        unsigned int    flags);
 
+void
+xfs_btree_init_block_int(
+       struct xfs_mount        *mp,
+       struct xfs_btree_block  *buf,
+       xfs_daddr_t             blkno,
+       __u32                   magic,
+       __u16                   level,
+       __u16                   numrecs,
+       __u64                   owner,
+       unsigned int            flags);
+
 /*
  * Common btree core entry points.
  */
@@ -407,6 +445,14 @@ int xfs_btree_insert(struct xfs_btree_cur *, int *);
 int xfs_btree_delete(struct xfs_btree_cur *, int *);
 int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
 
+/*
+ * btree block CRC helpers
+ */
+void xfs_btree_lblock_calc_crc(struct xfs_buf *);
+bool xfs_btree_lblock_verify_crc(struct xfs_buf *);
+void xfs_btree_sblock_calc_crc(struct xfs_buf *);
+bool xfs_btree_sblock_verify_crc(struct xfs_buf *);
+
 /*
  * Internal btree helpers also used by xfs_bmap.c.
  */