include/xfs_mount.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #ifndef __XFS_MOUNT_H__
  20 #define __XFS_MOUNT_H__
  21
  22 struct xfs_inode;
  23 struct xfs_buftarg;
  24 struct xfs_dir_ops;
  25 struct xfs_da_geometry;
  26
  27 /*
  28  * Define a user-level mount structure with all we need
  29  * in order to make use of the numerous XFS_* macros.
  30  */
  31 typedef struct xfs_mount {
  32         xfs_sb_t                m_sb;           /* copy of fs superblock */
  33 #define m_icount        m_sb.sb_icount
  34 #define m_ifree         m_sb.sb_ifree
  35 #define m_fdblocks      m_sb.sb_fdblocks
  36         char                    *m_fsname;      /* filesystem name */
  37         int                     m_bsize;        /* fs logical block size */
  38         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
  39         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
  40         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
  41         uint                    m_rsumlevels;   /* rt summary levels */
  42         uint                    m_rsumsize;     /* size of rt summary, bytes */
  43         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
  44         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
  45         struct xfs_buftarg      *m_ddev_targp;
  46         struct xfs_buftarg      *m_logdev_targp;
  47         struct xfs_buftarg      *m_rtdev_targp;
  48 #define m_dev           m_ddev_targp
  49 #define m_logdev        m_logdev_targp
  50 #define m_rtdev         m_rtdev_targp
  51         uint8_t                 m_dircook_elog; /* log d-cookie entry bits */
  52         uint8_t                 m_blkbit_log;   /* blocklog + NBBY */
  53         uint8_t                 m_blkbb_log;    /* blocklog - BBSHIFT */
  54         uint8_t                 m_sectbb_log;   /* sectorlog - BBSHIFT */
  55         uint8_t                 m_agno_log;     /* log #ag's */
  56         uint8_t                 m_agino_log;    /* #bits for agino in inum */
  57         uint                    m_inode_cluster_size;/* min inode buf size */
  58         uint                    m_blockmask;    /* sb_blocksize-1 */
  59         uint                    m_blockwsize;   /* sb_blocksize in words */
  60         uint                    m_blockwmask;   /* blockwsize-1 */
  61         uint                    m_alloc_mxr[2]; /* XFS_ALLOC_BLOCK_MAXRECS */
  62         uint                    m_alloc_mnr[2]; /* XFS_ALLOC_BLOCK_MINRECS */
  63         uint                    m_bmap_dmxr[2]; /* XFS_BMAP_BLOCK_DMAXRECS */
  64         uint                    m_bmap_dmnr[2]; /* XFS_BMAP_BLOCK_DMINRECS */
  65         uint                    m_inobt_mxr[2]; /* XFS_INOBT_BLOCK_MAXRECS */
  66         uint                    m_inobt_mnr[2]; /* XFS_INOBT_BLOCK_MINRECS */
  67         uint                    m_rmap_mxr[2];  /* max rmap btree records */
  68         uint                    m_rmap_mnr[2];  /* min rmap btree records */
  69         uint                    m_refc_mxr[2];  /* max refc btree records */
  70         uint                    m_refc_mnr[2];  /* min refc btree records */
  71         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
  72         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
  73         uint                    m_in_maxlevels; /* XFS_IN_MAXLEVELS */
  74         uint                    m_rmap_maxlevels; /* max rmap btree levels */
  75         uint                    m_refc_maxlevels; /* max refc btree levels */
  76         xfs_extlen_t            m_ag_prealloc_blocks; /* reserved ag blocks */
  77         uint                    m_alloc_set_aside; /* space we can't use */
  78         uint                    m_ag_max_usable; /* max space per AG */
  79         struct radix_tree_root  m_perag_tree;
  80         uint                    m_flags;        /* global mount flags */
  81         bool                    m_inotbt_nores; /* no per-AG finobt resv. */
  82         uint                    m_qflags;       /* quota status flags */
  83         uint                    m_attroffset;   /* inode attribute offset */
  84         int                     m_ialloc_inos;  /* inodes in inode allocation */
  85         int                     m_ialloc_blks;  /* blocks in inode allocation */
  86         int                     m_ialloc_min_blks; /* min blocks in sparse inode
  87                                                     * allocation */
  88         int                     m_litino;       /* size of inode union area */
  89         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
  90         struct xfs_trans_resv   m_resv;         /* precomputed res values */
  91         uint64_t                m_maxicount;    /* maximum inode count */
  92         int                     m_dalign;       /* stripe unit */
  93         int                     m_swidth;       /* stripe width */
  94         int                     m_sinoalign;    /* stripe unit inode alignmnt */
  95         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
  96
  97         struct xfs_da_geometry  *m_dir_geo;     /* directory block geometry */
  98         struct xfs_da_geometry  *m_attr_geo;    /* attribute block geometry */
  99         const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
 100         const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
 101 #define M_DIROPS(mp)    ((mp)->m_dir_inode_ops)
 102
 103         /*
 104          * anonymous struct to allow xfs_dquot_buf.c to compile.
 105          * Pointer is always null in userspace, so code does not use it at all
 106          */
 107         struct {
 108                 int     qi_dqperchunk;
 109         }                       *m_quotainfo;
 110
 111         /*
 112          * xlog is defined in libxlog and thus is not intialized by libxfs. This
 113          * allows an application to initialize and store a reference to the log
 114          * if warranted.
 115          */
 116         struct xlog             *m_log;
 117 } xfs_mount_t;
 118
 119 /* per-AG block reservation data structures*/
 120 enum xfs_ag_resv_type {
 121         XFS_AG_RESV_NONE = 0,
 122         XFS_AG_RESV_METADATA,
 123         XFS_AG_RESV_AGFL,
 124 };
 125
 126 struct xfs_ag_resv {
 127         /* number of blocks originally reserved here */
 128         xfs_extlen_t    ar_orig_reserved;
 129         /* number of blocks reserved here */
 130         xfs_extlen_t    ar_reserved;
 131         /* number of blocks originally asked for */
 132         xfs_extlen_t    ar_asked;
 133 };
 134
 135 /*
 136  * Per-ag incore structure, copies of information in agf and agi,
 137  * to improve the performance of allocation group selection.
 138  */
 139 typedef struct xfs_perag {
 140         struct xfs_mount *pag_mount;    /* owner filesystem */
 141         xfs_agnumber_t  pag_agno;       /* AG this structure belongs to */
 142         atomic_t        pag_ref;        /* perag reference count */
 143         char            pagf_init;      /* this agf's entry is initialized */
 144         char            pagi_init;      /* this agi's entry is initialized */
 145         char            pagf_metadata;  /* the agf is preferred to be metadata */
 146         char            pagi_inodeok;   /* The agi is ok for inodes */
 147         uint8_t         pagf_levels[XFS_BTNUM_AGF];
 148                                         /* # of levels in bno & cnt btree */
 149         uint32_t        pagf_flcount;   /* count of blocks in freelist */
 150         xfs_extlen_t    pagf_freeblks;  /* total free blocks */
 151         xfs_extlen_t    pagf_longest;   /* longest free space */
 152         uint32_t        pagf_btreeblks; /* # of blocks held in AGF btrees */
 153         xfs_agino_t     pagi_freecount; /* number of free inodes */
 154         xfs_agino_t     pagi_count;     /* number of allocated inodes */
 155
 156         /*
 157          * Inode allocation search lookup optimisation.
 158          * If the pagino matches, the search for new inodes
 159          * doesn't need to search the near ones again straight away
 160          */
 161         xfs_agino_t     pagl_pagino;
 162         xfs_agino_t     pagl_leftrec;
 163         xfs_agino_t     pagl_rightrec;
 164         int             pagb_count;     /* pagb slots in use */
 165
 166         /* Blocks reserved for all kinds of metadata. */
 167         struct xfs_ag_resv      pag_meta_resv;
 168         /* Blocks reserved for just AGFL-based metadata. */
 169         struct xfs_ag_resv      pag_agfl_resv;
 170
 171         /* reference count */
 172         uint8_t         pagf_refcount_level;
 173 } xfs_perag_t;
 174
 175 static inline struct xfs_ag_resv *
 176 xfs_perag_resv(
 177         struct xfs_perag        *pag,
 178         enum xfs_ag_resv_type   type)
 179 {
 180         switch (type) {
 181         case XFS_AG_RESV_METADATA:
 182                 return &pag->pag_meta_resv;
 183         case XFS_AG_RESV_AGFL:
 184                 return &pag->pag_agfl_resv;
 185         default:
 186                 return NULL;
 187         }
 188 }
 189
 190 #define LIBXFS_MOUNT_DEBUGGER           0x0001
 191 #define LIBXFS_MOUNT_32BITINODES        0x0002
 192 #define LIBXFS_MOUNT_32BITINOOPT        0x0004
 193 #define LIBXFS_MOUNT_COMPAT_ATTR        0x0008
 194 #define LIBXFS_MOUNT_ATTR2              0x0010
 195 #define LIBXFS_MOUNT_WANT_CORRUPTED     0x0020
 196
 197 #define LIBXFS_BHASHSIZE(sbp)           (1<<10)
 198
 199 extern xfs_mount_t      *libxfs_mount (xfs_mount_t *, xfs_sb_t *,
 200                                 dev_t, dev_t, dev_t, int);
 201 extern void     libxfs_umount (xfs_mount_t *);
 202 extern void     libxfs_rtmount_destroy (xfs_mount_t *);
 203
 204 #endif  /* __XFS_MOUNT_H__ */