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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_ag.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
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!
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+/*
+ * 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__ */