xfs: nothing special about 1-block log sector

[safe/jmp/linux-2.6] / fs / xfs / xfs_ag.h

diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index 2bfd863..abb8222 100644 (file)
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -86,11 +86,27 @@ typedef struct xfs_agf {
 #define        XFS_AGF_NUM_BITS        12
 #define        XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
 
+#define XFS_AGF_FLAGS \
+       { XFS_AGF_MAGICNUM,     "MAGICNUM" }, \
+       { XFS_AGF_VERSIONNUM,   "VERSIONNUM" }, \
+       { XFS_AGF_SEQNO,        "SEQNO" }, \
+       { XFS_AGF_LENGTH,       "LENGTH" }, \
+       { XFS_AGF_ROOTS,        "ROOTS" }, \
+       { XFS_AGF_LEVELS,       "LEVELS" }, \
+       { XFS_AGF_FLFIRST,      "FLFIRST" }, \
+       { XFS_AGF_FLLAST,       "FLLAST" }, \
+       { XFS_AGF_FLCOUNT,      "FLCOUNT" }, \
+       { XFS_AGF_FREEBLKS,     "FREEBLKS" }, \
+       { XFS_AGF_LONGEST,      "LONGEST" }, \
+       { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }
+
 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGF_DADDR(mp)      ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
 #define        XFS_AGF_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
 #define        XFS_BUF_TO_AGF(bp)      ((xfs_agf_t *)XFS_BUF_PTR(bp))
 
+extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
+                       xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
 
 /*
  * Size of the unlinked inode hash table in the agi.
@@ -142,6 +158,9 @@ typedef struct xfs_agi {
 #define        XFS_AGI_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
 #define        XFS_BUF_TO_AGI(bp)      ((xfs_agi_t *)XFS_BUF_PTR(bp))
 
+extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
+                               xfs_agnumber_t agno, struct xfs_buf **bpp);
+
 /*
  * The third a.g. block contains the a.g. freelist, an array
  * of block pointers to blocks owned by the allocation btree code.
@@ -168,17 +187,13 @@ typedef struct xfs_perag_busy {
 /*
  * Per-ag incore structure, copies of information in agf and agi,
  * to improve the performance of allocation group selection.
- *
- * pick sizes which fit in allocation buckets well
  */
-#if (BITS_PER_LONG == 32)
-#define XFS_PAGB_NUM_SLOTS     84
-#elif (BITS_PER_LONG == 64)
 #define XFS_PAGB_NUM_SLOTS     128
-#endif
 
-typedef struct xfs_perag
-{
+typedef struct xfs_perag {
+       struct xfs_mount *pag_mount;    /* owner filesystem */
+       xfs_agnumber_t  pag_agno;       /* AG this structure belongs to */
+       atomic_t        pag_ref;        /* perag reference count */
        char            pagf_init;      /* this agf's entry is initialized */
        char            pagi_init;      /* this agi's entry is initialized */
        char            pagf_metadata;  /* the agf is preferred to be metadata */
@@ -191,8 +206,15 @@ typedef struct xfs_perag
        __uint32_t      pagf_btreeblks; /* # of blocks held in AGF btrees */
        xfs_agino_t     pagi_freecount; /* number of free inodes */
        xfs_agino_t     pagi_count;     /* number of allocated inodes */
-       int             pagb_count;     /* pagb slots in use */
-       xfs_perag_busy_t *pagb_list;    /* unstable blocks */
+
+       /*
+        * Inode allocation search lookup optimisation.
+        * If the pagino matches, the search for new inodes
+        * doesn't need to search the near ones again straight away
+        */
+       xfs_agino_t     pagl_pagino;
+       xfs_agino_t     pagl_leftrec;
+       xfs_agino_t     pagl_rightrec;
 #ifdef __KERNEL__
        spinlock_t      pagb_lock;      /* lock for pagb_list */
 
@@ -201,12 +223,17 @@ typedef struct xfs_perag
        int             pag_ici_init;   /* incore inode cache initialised */
        rwlock_t        pag_ici_lock;   /* incore inode lock */
        struct radix_tree_root pag_ici_root;    /* incore inode cache root */
+       int             pag_ici_reclaimable;    /* reclaimable inodes */
 #endif
+       int             pagb_count;     /* pagb slots in use */
+       xfs_perag_busy_t pagb_list[XFS_PAGB_NUM_SLOTS]; /* unstable blocks */
 } xfs_perag_t;
 
 /*
  * tags for inode radix tree
  */
+#define XFS_ICI_NO_TAG         (-1)    /* special flag for an untagged lookup
+                                          in xfs_inode_ag_iterator */
 #define XFS_ICI_RECLAIM_TAG    0       /* inode is to be reclaimed */
 
 #define        XFS_AG_MAXLEVELS(mp)            ((mp)->m_ag_maxlevels)
@@ -218,15 +245,15 @@ typedef struct xfs_perag
                be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))
 #define        XFS_MIN_FREELIST_PAG(pag,mp)    \
        (XFS_MIN_FREELIST_RAW(          \
-               (uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
-               (uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
+               (unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
+               (unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))
 
 #define XFS_AGB_TO_FSB(mp,agno,agbno)  \
        (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
 #define        XFS_FSB_TO_AGNO(mp,fsbno)       \
        ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
 #define        XFS_FSB_TO_AGBNO(mp,fsbno)      \
-       ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
+       ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
 #define        XFS_AGB_TO_DADDR(mp,agno,agbno) \
        ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
                (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
@@ -239,8 +266,8 @@ typedef struct xfs_perag
 #define        XFS_AG_CHECK_DADDR(mp,d,len)    \
        ((len) == 1 ? \
            ASSERT((d) == XFS_SB_DADDR || \
-                  XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \
-           ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \
-                  XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1)))
+                  xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
+           ASSERT(xfs_daddr_to_agno(mp, d) == \
+                  xfs_daddr_to_agno(mp, (d) + (len) - 1)))
 
 #endif /* __XFS_AG_H__ */