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Linux/fs/xfs/xfs_rtalloc.h

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  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__ */
163 

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