fs/xfs/xfs_rtalloc.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_RTALLOC_H__
   7 #define __XFS_RTALLOC_H__
   8
   9 /* kernel only definitions and functions */
  10
  11 struct xfs_mount;
  12 struct xfs_trans;
  13
  14 /*
  15  * XXX: Most of the realtime allocation functions deal in units of realtime
  16  * extents, not realtime blocks.  This looks funny when paired with the type
  17  * name and screams for a larger cleanup.
  18  */
  19 struct xfs_rtalloc_rec {
  20         xfs_rtblock_t           ar_startext;
  21         xfs_rtblock_t           ar_extcount;
  22 };
  23
  24 typedef int (*xfs_rtalloc_query_range_fn)(
  25         struct xfs_trans        *tp,
  26         struct xfs_rtalloc_rec  *rec,
  27         void                    *priv);
  28
  29 #ifdef CONFIG_XFS_RT
  30 /*
  31  * Function prototypes for exported functions.
  32  */
  33
  34 /*
  35  * Allocate an extent in the realtime subvolume, with the usual allocation
  36  * parameters.  The length units are all in realtime extents, as is the
  37  * result block number.
  38  */
  39 int                                     /* error */
  40 xfs_rtallocate_extent(
  41         struct xfs_trans        *tp,    /* transaction pointer */
  42         xfs_rtblock_t           bno,    /* starting block number to allocate */
  43         xfs_extlen_t            minlen, /* minimum length to allocate */
  44         xfs_extlen_t            maxlen, /* maximum length to allocate */
  45         xfs_extlen_t            *len,   /* out: actual length allocated */
  46         int                     wasdel, /* was a delayed allocation extent */
  47         xfs_extlen_t            prod,   /* extent product factor */
  48         xfs_rtblock_t           *rtblock); /* out: start block allocated */
  49
  50 /*
  51  * Free an extent in the realtime subvolume.  Length is expressed in
  52  * realtime extents, as is the block number.
  53  */
  54 int                                     /* error */
  55 xfs_rtfree_extent(
  56         struct xfs_trans        *tp,    /* transaction pointer */
  57         xfs_rtblock_t           bno,    /* starting block number to free */
  58         xfs_extlen_t            len);   /* length of extent freed */
  59
  60 /*
  61  * Initialize realtime fields in the mount structure.
  62  */
  63 int                                     /* error */
  64 xfs_rtmount_init(
  65         struct xfs_mount        *mp);   /* file system mount structure */
  66 void
  67 xfs_rtunmount_inodes(
  68         struct xfs_mount        *mp);
  69
  70 /*
  71  * Get the bitmap and summary inodes into the mount structure
  72  * at mount time.
  73  */
  74 int                                     /* error */
  75 xfs_rtmount_inodes(
  76         struct xfs_mount        *mp);   /* file system mount structure */
  77
  78 /*
  79  * Pick an extent for allocation at the start of a new realtime file.
  80  * Use the sequence number stored in the atime field of the bitmap inode.
  81  * Translate this to a fraction of the rtextents, and return the product
  82  * of rtextents and the fraction.
  83  * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
  84  */
  85 int                                     /* error */
  86 xfs_rtpick_extent(
  87         struct xfs_mount        *mp,    /* file system mount point */
  88         struct xfs_trans        *tp,    /* transaction pointer */
  89         xfs_extlen_t            len,    /* allocation length (rtextents) */
  90         xfs_rtblock_t           *pick); /* result rt extent */
  91
  92 /*
  93  * Grow the realtime area of the filesystem.
  94  */
  95 int
  96 xfs_growfs_rt(
  97         struct xfs_mount        *mp,    /* file system mount structure */
  98         xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
  99
 100 /*
 101  * From xfs_rtbitmap.c
 102  */
 103 int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
 104                   xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
 105 int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
 106                       xfs_rtblock_t start, xfs_extlen_t len, int val,
 107                       xfs_rtblock_t *new, int *stat);
 108 int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
 109                     xfs_rtblock_t start, xfs_rtblock_t limit,
 110                     xfs_rtblock_t *rtblock);
 111 int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
 112                     xfs_rtblock_t start, xfs_rtblock_t limit,
 113                     xfs_rtblock_t *rtblock);
 114 int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
 115                        xfs_rtblock_t start, xfs_extlen_t len, int val);
 116 int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
 117                              int log, xfs_rtblock_t bbno, int delta,
 118                              xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
 119                              xfs_suminfo_t *sum);
 120 int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
 121                          xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
 122                          xfs_fsblock_t *rsb);
 123 int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
 124                      xfs_rtblock_t start, xfs_extlen_t len,
 125                      struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
 126 int xfs_rtalloc_query_range(struct xfs_trans *tp,
 127                             struct xfs_rtalloc_rec *low_rec,
 128                             struct xfs_rtalloc_rec *high_rec,
 129                             xfs_rtalloc_query_range_fn fn,
 130                             void *priv);
 131 int xfs_rtalloc_query_all(struct xfs_trans *tp,
 132                           xfs_rtalloc_query_range_fn fn,
 133                           void *priv);
 134 bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
 135 int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
 136                                xfs_rtblock_t start, xfs_extlen_t len,
 137                                bool *is_free);
 138 #else
 139 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb)    (ENOSYS)
 140 # define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 141 # define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 142 # define xfs_growfs_rt(mp,in)                           (ENOSYS)
 143 # define xfs_rtalloc_query_range(t,l,h,f,p)             (ENOSYS)
 144 # define xfs_rtalloc_query_all(t,f,p)                   (ENOSYS)
 145 # define xfs_rtbuf_get(m,t,b,i,p)                       (ENOSYS)
 146 # define xfs_verify_rtbno(m, r)                 (false)
 147 # define xfs_rtalloc_extent_is_free(m,t,s,l,i)          (ENOSYS)
 148 static inline int               /* error */
 149 xfs_rtmount_init(
 150         xfs_mount_t     *mp)    /* file system mount structure */
 151 {
 152         if (mp->m_sb.sb_rblocks == 0)
 153                 return 0;
 154
 155         xfs_warn(mp, "Not built with CONFIG_XFS_RT");
 156         return -ENOSYS;
 157 }
 158 # define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 159 # define xfs_rtunmount_inodes(m)
 160 #endif  /* CONFIG_XFS_RT */
 161
 162 #endif  /* __XFS_RTALLOC_H__ */