fs/xfs/libxfs/xfs_alloc.h

   1 /*
   2  * Copyright (c) 2000-2002,2005 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 #ifndef __XFS_ALLOC_H__
  19 #define __XFS_ALLOC_H__
  20
  21 struct xfs_buf;
  22 struct xfs_btree_cur;
  23 struct xfs_mount;
  24 struct xfs_perag;
  25 struct xfs_trans;
  26
  27 extern struct workqueue_struct *xfs_alloc_wq;
  28
  29 /*
  30  * Freespace allocation types.  Argument to xfs_alloc_[v]extent.
  31  */
  32 #define XFS_ALLOCTYPE_FIRST_AG  0x02    /* ... start at ag 0 */
  33 #define XFS_ALLOCTYPE_THIS_AG   0x08    /* anywhere in this a.g. */
  34 #define XFS_ALLOCTYPE_START_BNO 0x10    /* near this block else anywhere */
  35 #define XFS_ALLOCTYPE_NEAR_BNO  0x20    /* in this a.g. and near this block */
  36 #define XFS_ALLOCTYPE_THIS_BNO  0x40    /* at exactly this block */
  37
  38 /* this should become an enum again when the tracing code is fixed */
  39 typedef unsigned int xfs_alloctype_t;
  40
  41 #define XFS_ALLOC_TYPES \
  42         { XFS_ALLOCTYPE_FIRST_AG,       "FIRST_AG" }, \
  43         { XFS_ALLOCTYPE_THIS_AG,        "THIS_AG" }, \
  44         { XFS_ALLOCTYPE_START_BNO,      "START_BNO" }, \
  45         { XFS_ALLOCTYPE_NEAR_BNO,       "NEAR_BNO" }, \
  46         { XFS_ALLOCTYPE_THIS_BNO,       "THIS_BNO" }
  47
  48 /*
  49  * Flags for xfs_alloc_fix_freelist.
  50  */
  51 #define XFS_ALLOC_FLAG_TRYLOCK  0x00000001  /* use trylock for buffer locking */
  52 #define XFS_ALLOC_FLAG_FREEING  0x00000002  /* indicate caller is freeing extents*/
  53 #define XFS_ALLOC_FLAG_NORMAP   0x00000004  /* don't modify the rmapbt */
  54 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008  /* don't shrink the freelist */
  55 #define XFS_ALLOC_FLAG_CHECK    0x00000010  /* test only, don't modify args */
  56
  57 /*
  58  * Argument structure for xfs_alloc routines.
  59  * This is turned into a structure to avoid having 20 arguments passed
  60  * down several levels of the stack.
  61  */
  62 typedef struct xfs_alloc_arg {
  63         struct xfs_trans *tp;           /* transaction pointer */
  64         struct xfs_mount *mp;           /* file system mount point */
  65         struct xfs_buf  *agbp;          /* buffer for a.g. freelist header */
  66         struct xfs_perag *pag;          /* per-ag struct for this agno */
  67         struct xfs_inode *ip;           /* for userdata zeroing method */
  68         xfs_fsblock_t   fsbno;          /* file system block number */
  69         xfs_agnumber_t  agno;           /* allocation group number */
  70         xfs_agblock_t   agbno;          /* allocation group-relative block # */
  71         xfs_extlen_t    minlen;         /* minimum size of extent */
  72         xfs_extlen_t    maxlen;         /* maximum size of extent */
  73         xfs_extlen_t    mod;            /* mod value for extent size */
  74         xfs_extlen_t    prod;           /* prod value for extent size */
  75         xfs_extlen_t    minleft;        /* min blocks must be left after us */
  76         xfs_extlen_t    total;          /* total blocks needed in xaction */
  77         xfs_extlen_t    alignment;      /* align answer to multiple of this */
  78         xfs_extlen_t    minalignslop;   /* slop for minlen+alignment calcs */
  79         xfs_agblock_t   min_agbno;      /* set an agbno range for NEAR allocs */
  80         xfs_agblock_t   max_agbno;      /* ... */
  81         xfs_extlen_t    len;            /* output: actual size of extent */
  82         xfs_alloctype_t type;           /* allocation type XFS_ALLOCTYPE_... */
  83         xfs_alloctype_t otype;          /* original allocation type */
  84         int             datatype;       /* mask defining data type treatment */
  85         char            wasdel;         /* set if allocation was prev delayed */
  86         char            wasfromfl;      /* set if allocation is from freelist */
  87         xfs_fsblock_t   firstblock;     /* io first block allocated */
  88         struct xfs_owner_info   oinfo;  /* owner of blocks being allocated */
  89         enum xfs_ag_resv_type   resv;   /* block reservation to use */
  90 } xfs_alloc_arg_t;
  91
  92 /*
  93  * Defines for datatype
  94  */
  95 #define XFS_ALLOC_USERDATA              (1 << 0)/* allocation is for user data*/
  96 #define XFS_ALLOC_INITIAL_USER_DATA     (1 << 1)/* special case start of file */
  97 #define XFS_ALLOC_USERDATA_ZERO         (1 << 2)/* zero extent on allocation */
  98 #define XFS_ALLOC_NOBUSY                (1 << 3)/* Busy extents not allowed */
  99
 100 static inline bool
 101 xfs_alloc_is_userdata(int datatype)
 102 {
 103         return (datatype & ~XFS_ALLOC_NOBUSY) != 0;
 104 }
 105
 106 static inline bool
 107 xfs_alloc_allow_busy_reuse(int datatype)
 108 {
 109         return (datatype & XFS_ALLOC_NOBUSY) == 0;
 110 }
 111
 112 /* freespace limit calculations */
 113 #define XFS_ALLOC_AGFL_RESERVE  4
 114 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
 115 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
 116
 117 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp,
 118                 struct xfs_perag *pag, xfs_extlen_t need,
 119                 xfs_extlen_t reserved);
 120 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
 121                 struct xfs_perag *pag);
 122
 123 /*
 124  * Compute and fill in value of m_ag_maxlevels.
 125  */
 126 void
 127 xfs_alloc_compute_maxlevels(
 128         struct xfs_mount        *mp);   /* file system mount structure */
 129
 130 /*
 131  * Get a block from the freelist.
 132  * Returns with the buffer for the block gotten.
 133  */
 134 int                             /* error */
 135 xfs_alloc_get_freelist(
 136         struct xfs_trans *tp,   /* transaction pointer */
 137         struct xfs_buf  *agbp,  /* buffer containing the agf structure */
 138         xfs_agblock_t   *bnop,  /* block address retrieved from freelist */
 139         int             btreeblk); /* destination is a AGF btree */
 140
 141 /*
 142  * Log the given fields from the agf structure.
 143  */
 144 void
 145 xfs_alloc_log_agf(
 146         struct xfs_trans *tp,   /* transaction pointer */
 147         struct xfs_buf  *bp,    /* buffer for a.g. freelist header */
 148         int             fields);/* mask of fields to be logged (XFS_AGF_...) */
 149
 150 /*
 151  * Interface for inode allocation to force the pag data to be initialized.
 152  */
 153 int                             /* error */
 154 xfs_alloc_pagf_init(
 155         struct xfs_mount *mp,   /* file system mount structure */
 156         struct xfs_trans *tp,   /* transaction pointer */
 157         xfs_agnumber_t  agno,   /* allocation group number */
 158         int             flags); /* XFS_ALLOC_FLAGS_... */
 159
 160 /*
 161  * Put the block on the freelist for the allocation group.
 162  */
 163 int                             /* error */
 164 xfs_alloc_put_freelist(
 165         struct xfs_trans *tp,   /* transaction pointer */
 166         struct xfs_buf  *agbp,  /* buffer for a.g. freelist header */
 167         struct xfs_buf  *agflbp,/* buffer for a.g. free block array */
 168         xfs_agblock_t   bno,    /* block being freed */
 169         int             btreeblk); /* owner was a AGF btree */
 170
 171 /*
 172  * Read in the allocation group header (free/alloc section).
 173  */
 174 int                                     /* error  */
 175 xfs_alloc_read_agf(
 176         struct xfs_mount *mp,           /* mount point structure */
 177         struct xfs_trans *tp,           /* transaction pointer */
 178         xfs_agnumber_t  agno,           /* allocation group number */
 179         int             flags,          /* XFS_ALLOC_FLAG_... */
 180         struct xfs_buf  **bpp);         /* buffer for the ag freelist header */
 181
 182 /*
 183  * Allocate an extent (variable-size).
 184  */
 185 int                             /* error */
 186 xfs_alloc_vextent(
 187         xfs_alloc_arg_t *args); /* allocation argument structure */
 188
 189 /*
 190  * Free an extent.
 191  */
 192 int                             /* error */
 193 xfs_free_extent(
 194         struct xfs_trans        *tp,    /* transaction pointer */
 195         xfs_fsblock_t           bno,    /* starting block number of extent */
 196         xfs_extlen_t            len,    /* length of extent */
 197         struct xfs_owner_info   *oinfo, /* extent owner */
 198         enum xfs_ag_resv_type   type);  /* block reservation type */
 199
 200 int                             /* error */
 201 xfs_alloc_lookup_ge(
 202         struct xfs_btree_cur    *cur,   /* btree cursor */
 203         xfs_agblock_t           bno,    /* starting block of extent */
 204         xfs_extlen_t            len,    /* length of extent */
 205         int                     *stat); /* success/failure */
 206
 207 int                                     /* error */
 208 xfs_alloc_get_rec(
 209         struct xfs_btree_cur    *cur,   /* btree cursor */
 210         xfs_agblock_t           *bno,   /* output: starting block of extent */
 211         xfs_extlen_t            *len,   /* output: length of extent */
 212         int                     *stat); /* output: success/failure */
 213
 214 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
 215                         xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
 216 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp,
 217                         xfs_agnumber_t agno, struct xfs_buf **bpp);
 218 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
 219 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
 220                 struct xfs_buf **agbp);
 221
 222 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
 223
 224 typedef int (*xfs_alloc_query_range_fn)(
 225         struct xfs_btree_cur            *cur,
 226         struct xfs_alloc_rec_incore     *rec,
 227         void                            *priv);
 228
 229 int xfs_alloc_query_range(struct xfs_btree_cur *cur,
 230                 struct xfs_alloc_rec_incore *low_rec,
 231                 struct xfs_alloc_rec_incore *high_rec,
 232                 xfs_alloc_query_range_fn fn, void *priv);
 233 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,
 234                 void *priv);
 235 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno);
 236 bool xfs_verify_agbno(struct xfs_mount *mp, xfs_agnumber_t agno,
 237                 xfs_agblock_t agbno);
 238 bool xfs_verify_fsbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
 239
 240 #endif  /* __XFS_ALLOC_H__ */