1 /* 2 * Copyright (c) 2000-2003,2005 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_RTALLOC_H__ 19 #define __XFS_RTALLOC_H__ 20 21 /* kernel only definitions and functions */ 22 23 struct xfs_mount; 24 struct xfs_trans; 25 26 /* 27 * XXX: Most of the realtime allocation functions deal in units of realtime 28 * extents, not realtime blocks. This looks funny when paired with the type 29 * name and screams for a larger cleanup. 30 */ 31 struct xfs_rtalloc_rec { 32 xfs_rtblock_t ar_startext; 33 xfs_rtblock_t ar_extcount; 34 }; 35 36 typedef int (*xfs_rtalloc_query_range_fn)( 37 struct xfs_trans *tp, 38 struct xfs_rtalloc_rec *rec, 39 void *priv); 40 41 #ifdef CONFIG_XFS_RT 42 /* 43 * Function prototypes for exported functions. 44 */ 45 46 /* 47 * Allocate an extent in the realtime subvolume, with the usual allocation 48 * parameters. The length units are all in realtime extents, as is the 49 * result block number. 50 */ 51 int /* error */ 52 xfs_rtallocate_extent( 53 struct xfs_trans *tp, /* transaction pointer */ 54 xfs_rtblock_t bno, /* starting block number to allocate */ 55 xfs_extlen_t minlen, /* minimum length to allocate */ 56 xfs_extlen_t maxlen, /* maximum length to allocate */ 57 xfs_extlen_t *len, /* out: actual length allocated */ 58 int wasdel, /* was a delayed allocation extent */ 59 xfs_extlen_t prod, /* extent product factor */ 60 xfs_rtblock_t *rtblock); /* out: start block allocated */ 61 62 /* 63 * Free an extent in the realtime subvolume. Length is expressed in 64 * realtime extents, as is the block number. 65 */ 66 int /* error */ 67 xfs_rtfree_extent( 68 struct xfs_trans *tp, /* transaction pointer */ 69 xfs_rtblock_t bno, /* starting block number to free */ 70 xfs_extlen_t len); /* length of extent freed */ 71 72 /* 73 * Initialize realtime fields in the mount structure. 74 */ 75 int /* error */ 76 xfs_rtmount_init( 77 struct xfs_mount *mp); /* file system mount structure */ 78 void 79 xfs_rtunmount_inodes( 80 struct xfs_mount *mp); 81 82 /* 83 * Get the bitmap and summary inodes into the mount structure 84 * at mount time. 85 */ 86 int /* error */ 87 xfs_rtmount_inodes( 88 struct xfs_mount *mp); /* file system mount structure */ 89 90 /* 91 * Pick an extent for allocation at the start of a new realtime file. 92 * Use the sequence number stored in the atime field of the bitmap inode. 93 * Translate this to a fraction of the rtextents, and return the product 94 * of rtextents and the fraction. 95 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... 96 */ 97 int /* error */ 98 xfs_rtpick_extent( 99 struct xfs_mount *mp, /* file system mount point */ 100 struct xfs_trans *tp, /* transaction pointer */ 101 xfs_extlen_t len, /* allocation length (rtextents) */ 102 xfs_rtblock_t *pick); /* result rt extent */ 103 104 /* 105 * Grow the realtime area of the filesystem. 106 */ 107 int 108 xfs_growfs_rt( 109 struct xfs_mount *mp, /* file system mount structure */ 110 xfs_growfs_rt_t *in); /* user supplied growfs struct */ 111 112 /* 113 * From xfs_rtbitmap.c 114 */ 115 int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp, 116 xfs_rtblock_t block, int issum, struct xfs_buf **bpp); 117 int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp, 118 xfs_rtblock_t start, xfs_extlen_t len, int val, 119 xfs_rtblock_t *new, int *stat); 120 int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp, 121 xfs_rtblock_t start, xfs_rtblock_t limit, 122 xfs_rtblock_t *rtblock); 123 int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp, 124 xfs_rtblock_t start, xfs_rtblock_t limit, 125 xfs_rtblock_t *rtblock); 126 int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp, 127 xfs_rtblock_t start, xfs_extlen_t len, int val); 128 int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp, 129 int log, xfs_rtblock_t bbno, int delta, 130 xfs_buf_t **rbpp, xfs_fsblock_t *rsb, 131 xfs_suminfo_t *sum); 132 int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log, 133 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp, 134 xfs_fsblock_t *rsb); 135 int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp, 136 xfs_rtblock_t start, xfs_extlen_t len, 137 struct xfs_buf **rbpp, xfs_fsblock_t *rsb); 138 int xfs_rtalloc_query_range(struct xfs_trans *tp, 139 struct xfs_rtalloc_rec *low_rec, 140 struct xfs_rtalloc_rec *high_rec, 141 xfs_rtalloc_query_range_fn fn, 142 void *priv); 143 int xfs_rtalloc_query_all(struct xfs_trans *tp, 144 xfs_rtalloc_query_range_fn fn, 145 void *priv); 146 bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno); 147 int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp, 148 xfs_rtblock_t start, xfs_extlen_t len, 149 bool *is_free); 150 #else 151 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (ENOSYS) 152 # define xfs_rtfree_extent(t,b,l) (ENOSYS) 153 # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS) 154 # define xfs_growfs_rt(mp,in) (ENOSYS) 155 # define xfs_rtalloc_query_range(t,l,h,f,p) (ENOSYS) 156 # define xfs_rtalloc_query_all(t,f,p) (ENOSYS) 157 # define xfs_rtbuf_get(m,t,b,i,p) (ENOSYS) 158 # define xfs_verify_rtbno(m, r) (false) 159 # define xfs_rtalloc_extent_is_free(m,t,s,l,i) (ENOSYS) 160 static inline int /* error */ 161 xfs_rtmount_init( 162 xfs_mount_t *mp) /* file system mount structure */ 163 { 164 if (mp->m_sb.sb_rblocks == 0) 165 return 0; 166 167 xfs_warn(mp, "Not built with CONFIG_XFS_RT"); 168 return -ENOSYS; 169 } 170 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) 171 # define xfs_rtunmount_inodes(m) 172 #endif /* CONFIG_XFS_RT */ 173 174 #endif /* __XFS_RTALLOC_H__ */ 175