xfs: store rmapbt block count in the AGF

Track the number of blocks used for the rmapbt in the AGF.  When we
get to the AG reservation code we need this counter to quickly
make our reservation during mount.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
index 8ed4bde976a7cc7527720f26b4191caec01ecf9d..c6f4601ff19b4cc1e90c5b740e5b3276e4b6a8f6 100644 (file)
--- a/libxfs/xfs_alloc.c
+++ b/libxfs/xfs_alloc.c
@@ -2260,6 +2260,9 @@ xfs_alloc_log_agf(
                offsetof(xfs_agf_t, agf_longest),
                offsetof(xfs_agf_t, agf_btreeblks),
                offsetof(xfs_agf_t, agf_uuid),
+               offsetof(xfs_agf_t, agf_rmap_blocks),
+               /* needed so that we don't log the whole rest of the structure: */
+               offsetof(xfs_agf_t, agf_spare64),
                sizeof(xfs_agf_t)
        };
 

diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 8ddbd1e2cc4dc71d94afed58787c9e2efa2780f9..e7baaf81b920232ea574f3f5a719ed053103ed2f 100644 (file)
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -641,12 +641,15 @@ typedef struct xfs_agf {
        __be32          agf_btreeblks;  /* # of blocks held in AGF btrees */
        uuid_t          agf_uuid;       /* uuid of filesystem */
 
+       __be32          agf_rmap_blocks;        /* rmapbt blocks used */
+       __be32          agf_padding;            /* padding */
+
        /*
         * 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];
+       __be64          agf_spare64[15];
 
        /* unlogged fields, written during buffer writeback. */
        __be64          agf_lsn;        /* last write sequence */
@@ -671,7 +674,9 @@ typedef struct xfs_agf {
 #define        XFS_AGF_LONGEST         0x00000400
 #define        XFS_AGF_BTREEBLKS       0x00000800
 #define        XFS_AGF_UUID            0x00001000
-#define        XFS_AGF_NUM_BITS        13
+#define        XFS_AGF_RMAP_BLOCKS     0x00002000
+#define        XFS_AGF_SPARE64         0x00004000
+#define        XFS_AGF_NUM_BITS        15
 #define        XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
 
 #define XFS_AGF_FLAGS \
@@ -687,7 +692,9 @@ typedef struct xfs_agf {
        { XFS_AGF_FREEBLKS,     "FREEBLKS" }, \
        { XFS_AGF_LONGEST,      "LONGEST" }, \
        { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }, \
-       { XFS_AGF_UUID,         "UUID" }
+       { XFS_AGF_UUID,         "UUID" }, \
+       { XFS_AGF_RMAP_BLOCKS,  "RMAP_BLOCKS" }, \
+       { XFS_AGF_SPARE64,      "SPARE64" }
 
 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGF_DADDR(mp)      ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))

diff --git a/libxfs/xfs_rmap_btree.c b/libxfs/xfs_rmap_btree.c
index 59055a8edaee1da26479668f30c7cf12347cb014..d1b3c0827a340f25f6bba24c88babe56b0957098 100644 (file)
--- a/libxfs/xfs_rmap_btree.c
+++ b/libxfs/xfs_rmap_btree.c
@@ -96,6 +96,8 @@ xfs_rmapbt_alloc_block(
        union xfs_btree_ptr     *new,
        int                     *stat)
 {
+       struct xfs_buf          *agbp = cur->bc_private.a.agbp;
+       struct xfs_agf          *agf = XFS_BUF_TO_AGF(agbp);
        int                     error;
        xfs_agblock_t           bno;
 
@@ -122,6 +124,8 @@ xfs_rmapbt_alloc_block(
 
        xfs_trans_agbtree_delta(cur->bc_tp, 1);
        new->s = cpu_to_be32(bno);
+       be32_add_cpu(&agf->agf_rmap_blocks, 1);
+       xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS);
 
        XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
        *stat = 1;
@@ -141,6 +145,8 @@ xfs_rmapbt_free_block(
        bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
        trace_xfs_rmapbt_free_block(cur->bc_mp, cur->bc_private.a.agno,
                        bno, 1);
+       be32_add_cpu(&agf->agf_rmap_blocks, -1);
+       xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS);
        error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
        if (error)
                return error;