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 #ifdef CONFIG_XFS_RT 27 /* 28 * Function prototypes for exported functions. 29 */ 30 31 /* 32 * Allocate an extent in the realtime subvolume, with the usual allocation 33 * parameters. The length units are all in realtime extents, as is the 34 * result block number. 35 */ 36 int /* error */ 37 xfs_rtallocate_extent( 38 struct xfs_trans *tp, /* transaction pointer */ 39 xfs_rtblock_t bno, /* starting block number to allocate */ 40 xfs_extlen_t minlen, /* minimum length to allocate */ 41 xfs_extlen_t maxlen, /* maximum length to allocate */ 42 xfs_extlen_t *len, /* out: actual length allocated */ 43 int wasdel, /* was a delayed allocation extent */ 44 xfs_extlen_t prod, /* extent product factor */ 45 xfs_rtblock_t *rtblock); /* out: start block allocated */ 46 47 /* 48 * Free an extent in the realtime subvolume. Length is expressed in 49 * realtime extents, as is the block number. 50 */ 51 int /* error */ 52 xfs_rtfree_extent( 53 struct xfs_trans *tp, /* transaction pointer */ 54 xfs_rtblock_t bno, /* starting block number to free */ 55 xfs_extlen_t len); /* length of extent freed */ 56 57 /* 58 * Initialize realtime fields in the mount structure. 59 */ 60 int /* error */ 61 xfs_rtmount_init( 62 struct xfs_mount *mp); /* file system mount structure */ 63 void 64 xfs_rtunmount_inodes( 65 struct xfs_mount *mp); 66 67 /* 68 * Get the bitmap and summary inodes into the mount structure 69 * at mount time. 70 */ 71 int /* error */ 72 xfs_rtmount_inodes( 73 struct xfs_mount *mp); /* file system mount structure */ 74 75 /* 76 * Pick an extent for allocation at the start of a new realtime file. 77 * Use the sequence number stored in the atime field of the bitmap inode. 78 * Translate this to a fraction of the rtextents, and return the product 79 * of rtextents and the fraction. 80 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... 81 */ 82 int /* error */ 83 xfs_rtpick_extent( 84 struct xfs_mount *mp, /* file system mount point */ 85 struct xfs_trans *tp, /* transaction pointer */ 86 xfs_extlen_t len, /* allocation length (rtextents) */ 87 xfs_rtblock_t *pick); /* result rt extent */ 88 89 /* 90 * Grow the realtime area of the filesystem. 91 */ 92 int 93 xfs_growfs_rt( 94 struct xfs_mount *mp, /* file system mount structure */ 95 xfs_growfs_rt_t *in); /* user supplied growfs struct */ 96 97 /* 98 * From xfs_rtbitmap.c 99 */ 100 int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp, 101 xfs_rtblock_t start, xfs_extlen_t len, int val, 102 xfs_rtblock_t *new, int *stat); 103 int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp, 104 xfs_rtblock_t start, xfs_rtblock_t limit, 105 xfs_rtblock_t *rtblock); 106 int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp, 107 xfs_rtblock_t start, xfs_rtblock_t limit, 108 xfs_rtblock_t *rtblock); 109 int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp, 110 xfs_rtblock_t start, xfs_extlen_t len, int val); 111 int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp, 112 int log, xfs_rtblock_t bbno, int delta, 113 xfs_buf_t **rbpp, xfs_fsblock_t *rsb, 114 xfs_suminfo_t *sum); 115 int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log, 116 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp, 117 xfs_fsblock_t *rsb); 118 int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp, 119 xfs_rtblock_t start, xfs_extlen_t len, 120 struct xfs_buf **rbpp, xfs_fsblock_t *rsb); 121 122 123 #else 124 # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (ENOSYS) 125 # define xfs_rtfree_extent(t,b,l) (ENOSYS) 126 # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS) 127 # define xfs_growfs_rt(mp,in) (ENOSYS) 128 static inline int /* error */ 129 xfs_rtmount_init( 130 xfs_mount_t *mp) /* file system mount structure */ 131 { 132 if (mp->m_sb.sb_rblocks == 0) 133 return 0; 134 135 xfs_warn(mp, "Not built with CONFIG_XFS_RT"); 136 return -ENOSYS; 137 } 138 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) 139 # define xfs_rtunmount_inodes(m) 140 #endif /* CONFIG_XFS_RT */ 141 142 #endif /* __XFS_RTALLOC_H__ */ 143