1 files changed, 52 insertions, 4 deletions

diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index f2aeedb6a579..317aa86d96ea 100644
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -30,6 +30,7 @@ struct xfs_trans;
 
 #define XFS_AGF_MAGIC   0x58414746      /* 'XAGF' */
 #define XFS_AGI_MAGIC   0x58414749      /* 'XAGI' */
+#define XFS_AGFL_MAGIC  0x5841464c      /* 'XAFL' */
 #define XFS_AGF_VERSION 1
 #define XFS_AGI_VERSION 1
 
@@ -63,12 +64,29 @@ typedef struct xfs_agf {
         __be32          agf_spare0;     /* spare field */
         __be32          agf_levels[XFS_BTNUM_AGF];      /* btree levels */
         __be32          agf_spare1;     /* spare field */
+
         __be32          agf_flfirst;    /* first freelist block's index */
         __be32          agf_fllast;     /* last freelist block's index */
         __be32          agf_flcount;    /* count of blocks in freelist */
         __be32          agf_freeblks;   /* total free blocks */
+
         __be32          agf_longest;    /* longest free space */
         __be32          agf_btreeblks;  /* # of blocks held in AGF btrees */
+        uuid_t          agf_uuid;       /* uuid of filesystem */
+
+        /*
+         * reserve some contiguous space for future logged fields before we add
+         * the unlogged fields. This makes the range logging via flags and
+         * structure offsets much simpler.
+         */
+        __be64          agf_spare64[16];
+
+        /* unlogged fields, written during buffer writeback. */
+        __be64          agf_lsn;        /* last write sequence */
+        __be32          agf_crc;        /* crc of agf sector */
+        __be32          agf_spare2;
+
+        /* structure must be padded to 64 bit alignment */
 } xfs_agf_t;
 
 #define XFS_AGF_MAGICNUM        0x00000001
@@ -83,7 +101,8 @@ typedef struct xfs_agf {
 #define XFS_AGF_FREEBLKS        0x00000200
 #define XFS_AGF_LONGEST         0x00000400
 #define XFS_AGF_BTREEBLKS       0x00000800
-#define XFS_AGF_NUM_BITS        12
+#define XFS_AGF_UUID            0x00001000
+#define XFS_AGF_NUM_BITS        13
 #define XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
 
 #define XFS_AGF_FLAGS \
@@ -98,7 +117,8 @@ typedef struct xfs_agf {
         { XFS_AGF_FLCOUNT,      "FLCOUNT" }, \
         { XFS_AGF_FREEBLKS,     "FREEBLKS" }, \
         { XFS_AGF_LONGEST,      "LONGEST" }, \
-        { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }
+        { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }, \
+        { XFS_AGF_UUID,         "UUID" }
 
 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGF_DADDR(mp)       ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
@@ -132,6 +152,7 @@ typedef struct xfs_agi {
         __be32          agi_root;       /* root of inode btree */
         __be32          agi_level;      /* levels in inode btree */
         __be32          agi_freecount;  /* number of free inodes */
+
         __be32          agi_newino;     /* new inode just allocated */
         __be32          agi_dirino;     /* last directory inode chunk */
         /*
@@ -139,6 +160,13 @@ typedef struct xfs_agi {
          * still being referenced.
          */
         __be32          agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
+
+        uuid_t          agi_uuid;       /* uuid of filesystem */
+        __be32          agi_crc;        /* crc of agi sector */
+        __be32          agi_pad32;
+        __be64          agi_lsn;        /* last write sequence */
+
+        /* structure must be padded to 64 bit alignment */
 } xfs_agi_t;
 
 #define XFS_AGI_MAGICNUM        0x00000001
@@ -171,11 +199,31 @@ extern const struct xfs_buf_ops xfs_agi_buf_ops;
  */
 #define XFS_AGFL_DADDR(mp)      ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
 #define XFS_AGFL_BLOCK(mp)      XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
-#define XFS_AGFL_SIZE(mp)       ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))
 #define XFS_BUF_TO_AGFL(bp)     ((xfs_agfl_t *)((bp)->b_addr))
 
+#define XFS_BUF_TO_AGFL_BNO(mp, bp) \
+        (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
+                &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
+                (__be32 *)(bp)->b_addr)
+
+/*
+ * Size of the AGFL.  For CRC-enabled filesystes we steal a couple of
+ * slots in the beginning of the block for a proper header with the
+ * location information and CRC.
+ */
+#define XFS_AGFL_SIZE(mp) \
+        (((mp)->m_sb.sb_sectsize - \
+         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
+                sizeof(struct xfs_agfl) : 0)) / \
+          sizeof(xfs_agblock_t))
+
 typedef struct xfs_agfl {
-        __be32          agfl_bno[1];    /* actually XFS_AGFL_SIZE(mp) */
+        __be32          agfl_magicnum;
+        __be32          agfl_seqno;
+        uuid_t          agfl_uuid;
+        __be64          agfl_lsn;
+        __be32          agfl_crc;
+        __be32          agfl_bno[];     /* actually XFS_AGFL_SIZE(mp) */
 } xfs_agfl_t;
 
 /*