Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 345 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
new file mode 100644
index 000000000000..96b70f7fba39
--- /dev/null
+++ b/fs/xfs/xfs_ag.h
@@ -0,0 +1,345 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_AG_H__
+#define __XFS_AG_H__
+
+/*
+ * Allocation group header
+ * This is divided into three structures, placed in sequential 512-byte
+ * buffers after a copy of the superblock (also in a 512-byte buffer).
+ */
+
+struct xfs_buf;
+struct xfs_mount;
+struct xfs_trans;
+
+#define XFS_AGF_MAGIC   0x58414746      /* 'XAGF' */
+#define XFS_AGI_MAGIC   0x58414749      /* 'XAGI' */
+#define XFS_AGF_VERSION 1
+#define XFS_AGI_VERSION 1
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGF_GOOD_VERSION)
+int xfs_agf_good_version(unsigned v);
+#define XFS_AGF_GOOD_VERSION(v) xfs_agf_good_version(v)
+#else
+#define XFS_AGF_GOOD_VERSION(v)         ((v) == XFS_AGF_VERSION)
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGI_GOOD_VERSION)
+int xfs_agi_good_version(unsigned v);
+#define XFS_AGI_GOOD_VERSION(v) xfs_agi_good_version(v)
+#else
+#define XFS_AGI_GOOD_VERSION(v)         ((v) == XFS_AGI_VERSION)
+#endif
+
+/*
+ * Btree number 0 is bno, 1 is cnt.  This value gives the size of the
+ * arrays below.
+ */
+#define XFS_BTNUM_AGF   ((int)XFS_BTNUM_CNTi + 1)
+
+/*
+ * The second word of agf_levels in the first a.g. overlaps the EFS
+ * superblock's magic number.  Since the magic numbers valid for EFS
+ * are > 64k, our value cannot be confused for an EFS superblock's.
+ */
+
+typedef struct xfs_agf
+{
+        /*
+         * Common allocation group header information
+         */
+        __uint32_t      agf_magicnum;   /* magic number == XFS_AGF_MAGIC */
+        __uint32_t      agf_versionnum; /* header version == XFS_AGF_VERSION */
+        xfs_agnumber_t  agf_seqno;      /* sequence # starting from 0 */
+        xfs_agblock_t   agf_length;     /* size in blocks of a.g. */
+        /*
+         * Freespace information
+         */
+        xfs_agblock_t   agf_roots[XFS_BTNUM_AGF];       /* root blocks */
+        __uint32_t      agf_spare0;     /* spare field */
+        __uint32_t      agf_levels[XFS_BTNUM_AGF];      /* btree levels */
+        __uint32_t      agf_spare1;     /* spare field */
+        __uint32_t      agf_flfirst;    /* first freelist block's index */
+        __uint32_t      agf_fllast;     /* last freelist block's index */
+        __uint32_t      agf_flcount;    /* count of blocks in freelist */
+        xfs_extlen_t    agf_freeblks;   /* total free blocks */
+        xfs_extlen_t    agf_longest;    /* longest free space */
+} xfs_agf_t;
+
+#define XFS_AGF_MAGICNUM        0x00000001
+#define XFS_AGF_VERSIONNUM      0x00000002
+#define XFS_AGF_SEQNO           0x00000004
+#define XFS_AGF_LENGTH          0x00000008
+#define XFS_AGF_ROOTS           0x00000010
+#define XFS_AGF_LEVELS          0x00000020
+#define XFS_AGF_FLFIRST         0x00000040
+#define XFS_AGF_FLLAST          0x00000080
+#define XFS_AGF_FLCOUNT         0x00000100
+#define XFS_AGF_FREEBLKS        0x00000200
+#define XFS_AGF_LONGEST         0x00000400
+#define XFS_AGF_NUM_BITS        11
+#define XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
+
+/* disk block (xfs_daddr_t) in the AG */
+#define XFS_AGF_DADDR(mp)       ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGF_BLOCK)
+xfs_agblock_t xfs_agf_block(struct xfs_mount *mp);
+#define XFS_AGF_BLOCK(mp)       xfs_agf_block(mp)
+#else
+#define XFS_AGF_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
+#endif
+
+/*
+ * Size of the unlinked inode hash table in the agi.
+ */
+#define XFS_AGI_UNLINKED_BUCKETS        64
+
+typedef struct xfs_agi
+{
+        /*
+         * Common allocation group header information
+         */
+        __uint32_t      agi_magicnum;   /* magic number == XFS_AGI_MAGIC */
+        __uint32_t      agi_versionnum; /* header version == XFS_AGI_VERSION */
+        xfs_agnumber_t  agi_seqno;      /* sequence # starting from 0 */
+        xfs_agblock_t   agi_length;     /* size in blocks of a.g. */
+        /*
+         * Inode information
+         * Inodes are mapped by interpreting the inode number, so no
+         * mapping data is needed here.
+         */
+        xfs_agino_t     agi_count;      /* count of allocated inodes */
+        xfs_agblock_t   agi_root;       /* root of inode btree */
+        __uint32_t      agi_level;      /* levels in inode btree */
+        xfs_agino_t     agi_freecount;  /* number of free inodes */
+        xfs_agino_t     agi_newino;     /* new inode just allocated */
+        xfs_agino_t     agi_dirino;     /* last directory inode chunk */
+        /*
+         * Hash table of inodes which have been unlinked but are
+         * still being referenced.
+         */
+        xfs_agino_t     agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
+} xfs_agi_t;
+
+#define XFS_AGI_MAGICNUM        0x00000001
+#define XFS_AGI_VERSIONNUM      0x00000002
+#define XFS_AGI_SEQNO           0x00000004
+#define XFS_AGI_LENGTH          0x00000008
+#define XFS_AGI_COUNT           0x00000010
+#define XFS_AGI_ROOT            0x00000020
+#define XFS_AGI_LEVEL           0x00000040
+#define XFS_AGI_FREECOUNT       0x00000080
+#define XFS_AGI_NEWINO          0x00000100
+#define XFS_AGI_DIRINO          0x00000200
+#define XFS_AGI_UNLINKED        0x00000400
+#define XFS_AGI_NUM_BITS        11
+#define XFS_AGI_ALL_BITS        ((1 << XFS_AGI_NUM_BITS) - 1)
+
+/* disk block (xfs_daddr_t) in the AG */
+#define XFS_AGI_DADDR(mp)       ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGI_BLOCK)
+xfs_agblock_t xfs_agi_block(struct xfs_mount *mp);
+#define XFS_AGI_BLOCK(mp)       xfs_agi_block(mp)
+#else
+#define XFS_AGI_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
+#endif
+
+/*
+ * The third a.g. block contains the a.g. freelist, an array
+ * of block pointers to blocks owned by the allocation btree code.
+ */
+#define XFS_AGFL_DADDR(mp)      ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGFL_BLOCK)
+xfs_agblock_t xfs_agfl_block(struct xfs_mount *mp);
+#define XFS_AGFL_BLOCK(mp)      xfs_agfl_block(mp)
+#else
+#define XFS_AGFL_BLOCK(mp)      XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
+#endif
+#define XFS_AGFL_SIZE(mp)       ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))
+
+typedef struct xfs_agfl {
+        xfs_agblock_t   agfl_bno[1];    /* actually XFS_AGFL_SIZE(mp) */
+} xfs_agfl_t;
+
+/*
+ * Busy block/extent entry.  Used in perag to mark blocks that have been freed
+ * but whose transactions aren't committed to disk yet.
+ */
+typedef struct xfs_perag_busy {
+        xfs_agblock_t   busy_start;
+        xfs_extlen_t    busy_length;
+        struct xfs_trans *busy_tp;      /* transaction that did the free */
+} xfs_perag_busy_t;
+
+/*
+ * 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
+{
+        char            pagf_init;      /* this agf's entry is initialized */
+        char            pagi_init;      /* this agi's entry is initialized */
+        char            pagf_metadata;  /* the agf is prefered to be metadata */
+        char            pagi_inodeok;   /* The agi is ok for inodes */
+        __uint8_t       pagf_levels[XFS_BTNUM_AGF];
+                                        /* # of levels in bno & cnt btree */
+        __uint32_t      pagf_flcount;   /* count of blocks in freelist */
+        xfs_extlen_t    pagf_freeblks;  /* total free blocks */
+        xfs_extlen_t    pagf_longest;   /* longest free space */
+        xfs_agino_t     pagi_freecount; /* number of free inodes */
+#ifdef __KERNEL__
+        lock_t          pagb_lock;      /* lock for pagb_list */
+#endif
+        int             pagb_count;     /* pagb slots in use */
+        xfs_perag_busy_t *pagb_list;    /* unstable blocks */
+} xfs_perag_t;
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_MAXLEVELS)
+int xfs_ag_maxlevels(struct xfs_mount *mp);
+#define XFS_AG_MAXLEVELS(mp)            xfs_ag_maxlevels(mp)
+#else
+#define XFS_AG_MAXLEVELS(mp)    ((mp)->m_ag_maxlevels)
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST)
+int xfs_min_freelist(xfs_agf_t *a, struct xfs_mount *mp);
+#define XFS_MIN_FREELIST(a,mp)          xfs_min_freelist(a,mp)
+#else
+#define XFS_MIN_FREELIST(a,mp)  \
+        XFS_MIN_FREELIST_RAW(   \
+                INT_GET((a)->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT), \
+                INT_GET((a)->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT), mp)
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_PAG)
+int xfs_min_freelist_pag(xfs_perag_t *pag, struct xfs_mount *mp);
+#define XFS_MIN_FREELIST_PAG(pag,mp)    xfs_min_freelist_pag(pag,mp)
+#else
+#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)
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_RAW)
+int xfs_min_freelist_raw(int bl, int cl, struct xfs_mount *mp);
+#define XFS_MIN_FREELIST_RAW(bl,cl,mp)  xfs_min_freelist_raw(bl,cl,mp)
+#else
+#define XFS_MIN_FREELIST_RAW(bl,cl,mp)  \
+        (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + \
+         MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_FSB)
+xfs_fsblock_t xfs_agb_to_fsb(struct xfs_mount *mp, xfs_agnumber_t agno,
+                             xfs_agblock_t agbno);
+#define XFS_AGB_TO_FSB(mp,agno,agbno)   xfs_agb_to_fsb(mp,agno,agbno)
+#else
+#define XFS_AGB_TO_FSB(mp,agno,agbno) \
+        (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGNO)
+xfs_agnumber_t xfs_fsb_to_agno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
+#define XFS_FSB_TO_AGNO(mp,fsbno)       xfs_fsb_to_agno(mp,fsbno)
+#else
+#define XFS_FSB_TO_AGNO(mp,fsbno) \
+        ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGBNO)
+xfs_agblock_t xfs_fsb_to_agbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
+#define XFS_FSB_TO_AGBNO(mp,fsbno)      xfs_fsb_to_agbno(mp,fsbno)
+#else
+#define XFS_FSB_TO_AGBNO(mp,fsbno) \
+        ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_DADDR)
+xfs_daddr_t xfs_agb_to_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
+                                xfs_agblock_t agbno);
+#define XFS_AGB_TO_DADDR(mp,agno,agbno) xfs_agb_to_daddr(mp,agno,agbno)
+#else
+#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))))
+#endif
+/*
+ * XFS_DADDR_TO_AGNO and XFS_DADDR_TO_AGBNO moved to xfs_mount.h
+ * to avoid header file ordering change
+ */
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_DADDR)
+xfs_daddr_t xfs_ag_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
+                                xfs_daddr_t d);
+#define XFS_AG_DADDR(mp,agno,d)         xfs_ag_daddr(mp,agno,d)
+#else
+#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGF)
+xfs_agf_t *xfs_buf_to_agf(struct xfs_buf *bp);
+#define XFS_BUF_TO_AGF(bp)              xfs_buf_to_agf(bp)
+#else
+#define XFS_BUF_TO_AGF(bp)      ((xfs_agf_t *)XFS_BUF_PTR(bp))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGI)
+xfs_agi_t *xfs_buf_to_agi(struct xfs_buf *bp);
+#define XFS_BUF_TO_AGI(bp)              xfs_buf_to_agi(bp)
+#else
+#define XFS_BUF_TO_AGI(bp)      ((xfs_agi_t *)XFS_BUF_PTR(bp))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGFL)
+xfs_agfl_t *xfs_buf_to_agfl(struct xfs_buf *bp);
+#define XFS_BUF_TO_AGFL(bp)             xfs_buf_to_agfl(bp)
+#else
+#define XFS_BUF_TO_AGFL(bp)     ((xfs_agfl_t *)XFS_BUF_PTR(bp))
+#endif
+
+/*
+ * For checking for bad ranges of xfs_daddr_t's, covering multiple
+ * allocation groups or a single xfs_daddr_t that's a superblock copy.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_CHECK_DADDR)
+void xfs_ag_check_daddr(struct xfs_mount *mp, xfs_daddr_t d, xfs_extlen_t len);
+#define XFS_AG_CHECK_DADDR(mp,d,len)    xfs_ag_check_daddr(mp,d,len)
+#else
+#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)))
+#endif
+
+#endif  /* __XFS_AG_H__ */