Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | #ifndef __XFS_ALLOC_H__ |
| 19 | #define __XFS_ALLOC_H__ |
| 20 | |
| 21 | struct xfs_buf; |
| 22 | struct xfs_mount; |
| 23 | struct xfs_perag; |
| 24 | struct xfs_trans; |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame^] | 25 | struct xfs_busy_extent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | /* |
| 28 | * Freespace allocation types. Argument to xfs_alloc_[v]extent. |
| 29 | */ |
| 30 | typedef enum xfs_alloctype |
| 31 | { |
| 32 | XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */ |
| 33 | XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */ |
| 34 | XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */ |
| 35 | XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */ |
| 36 | XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */ |
| 37 | XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */ |
| 38 | XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */ |
| 39 | } xfs_alloctype_t; |
| 40 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 41 | #define XFS_ALLOC_TYPES \ |
| 42 | { XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \ |
| 43 | { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ |
| 44 | { XFS_ALLOCTYPE_START_AG, "START_AG" }, \ |
| 45 | { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ |
| 46 | { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ |
| 47 | { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ |
| 48 | { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | /* |
| 51 | * Flags for xfs_alloc_fix_freelist. |
| 52 | */ |
| 53 | #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ |
Yingping Lu | d210a28 | 2006-06-09 14:55:18 +1000 | [diff] [blame] | 54 | #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | /* |
David Chinner | 4be536d | 2006-09-07 14:26:50 +1000 | [diff] [blame] | 57 | * In order to avoid ENOSPC-related deadlock caused by |
| 58 | * out-of-order locking of AGF buffer (PV 947395), we place |
| 59 | * constraints on the relationship among actual allocations for |
| 60 | * data blocks, freelist blocks, and potential file data bmap |
| 61 | * btree blocks. However, these restrictions may result in no |
| 62 | * actual space allocated for a delayed extent, for example, a data |
| 63 | * block in a certain AG is allocated but there is no additional |
| 64 | * block for the additional bmap btree block due to a split of the |
| 65 | * bmap btree of the file. The result of this may lead to an |
| 66 | * infinite loop in xfssyncd when the file gets flushed to disk and |
| 67 | * all delayed extents need to be actually allocated. To get around |
| 68 | * this, we explicitly set aside a few blocks which will not be |
| 69 | * reserved in delayed allocation. Considering the minimum number of |
| 70 | * needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap |
| 71 | * btree requires 1 fsb, so we set the number of set-aside blocks |
| 72 | * to 4 + 4*agcount. |
| 73 | */ |
| 74 | #define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4)) |
| 75 | |
| 76 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | * Argument structure for xfs_alloc routines. |
| 78 | * This is turned into a structure to avoid having 20 arguments passed |
| 79 | * down several levels of the stack. |
| 80 | */ |
| 81 | typedef struct xfs_alloc_arg { |
| 82 | struct xfs_trans *tp; /* transaction pointer */ |
| 83 | struct xfs_mount *mp; /* file system mount point */ |
| 84 | struct xfs_buf *agbp; /* buffer for a.g. freelist header */ |
| 85 | struct xfs_perag *pag; /* per-ag struct for this agno */ |
| 86 | xfs_fsblock_t fsbno; /* file system block number */ |
| 87 | xfs_agnumber_t agno; /* allocation group number */ |
| 88 | xfs_agblock_t agbno; /* allocation group-relative block # */ |
| 89 | xfs_extlen_t minlen; /* minimum size of extent */ |
| 90 | xfs_extlen_t maxlen; /* maximum size of extent */ |
| 91 | xfs_extlen_t mod; /* mod value for extent size */ |
| 92 | xfs_extlen_t prod; /* prod value for extent size */ |
| 93 | xfs_extlen_t minleft; /* min blocks must be left after us */ |
| 94 | xfs_extlen_t total; /* total blocks needed in xaction */ |
| 95 | xfs_extlen_t alignment; /* align answer to multiple of this */ |
| 96 | xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ |
| 97 | xfs_extlen_t len; /* output: actual size of extent */ |
| 98 | xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ |
| 99 | xfs_alloctype_t otype; /* original allocation type */ |
| 100 | char wasdel; /* set if allocation was prev delayed */ |
| 101 | char wasfromfl; /* set if allocation is from freelist */ |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 102 | char isfl; /* set if is freelist blocks - !acctg */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | char userdata; /* set if this is user data */ |
Yingping Lu | d210a28 | 2006-06-09 14:55:18 +1000 | [diff] [blame] | 104 | xfs_fsblock_t firstblock; /* io first block allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } xfs_alloc_arg_t; |
| 106 | |
| 107 | /* |
| 108 | * Defines for userdata |
| 109 | */ |
| 110 | #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ |
| 111 | #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ |
| 112 | |
Dave Chinner | 6cc8764 | 2009-03-16 08:29:46 +0100 | [diff] [blame] | 113 | /* |
| 114 | * Find the length of the longest extent in an AG. |
| 115 | */ |
| 116 | xfs_extlen_t |
| 117 | xfs_alloc_longest_free_extent(struct xfs_mount *mp, |
| 118 | struct xfs_perag *pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | #ifdef __KERNEL__ |
| 121 | |
Barry Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 122 | void |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame^] | 123 | xfs_alloc_busy_insert(xfs_trans_t *tp, |
Barry Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 124 | xfs_agnumber_t agno, |
| 125 | xfs_agblock_t bno, |
| 126 | xfs_extlen_t len); |
| 127 | |
| 128 | void |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame^] | 129 | xfs_alloc_busy_clear(struct xfs_mount *mp, struct xfs_busy_extent *busyp); |
Barry Naujok | 847fff5 | 2008-10-30 17:05:38 +1100 | [diff] [blame] | 130 | |
| 131 | #endif /* __KERNEL__ */ |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Compute and fill in value of m_ag_maxlevels. |
| 135 | */ |
| 136 | void |
| 137 | xfs_alloc_compute_maxlevels( |
| 138 | struct xfs_mount *mp); /* file system mount structure */ |
| 139 | |
| 140 | /* |
| 141 | * Get a block from the freelist. |
| 142 | * Returns with the buffer for the block gotten. |
| 143 | */ |
| 144 | int /* error */ |
| 145 | xfs_alloc_get_freelist( |
| 146 | struct xfs_trans *tp, /* transaction pointer */ |
| 147 | struct xfs_buf *agbp, /* buffer containing the agf structure */ |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 148 | xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
| 149 | int btreeblk); /* destination is a AGF btree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | /* |
| 152 | * Log the given fields from the agf structure. |
| 153 | */ |
| 154 | void |
| 155 | xfs_alloc_log_agf( |
| 156 | struct xfs_trans *tp, /* transaction pointer */ |
| 157 | struct xfs_buf *bp, /* buffer for a.g. freelist header */ |
| 158 | int fields);/* mask of fields to be logged (XFS_AGF_...) */ |
| 159 | |
| 160 | /* |
| 161 | * Interface for inode allocation to force the pag data to be initialized. |
| 162 | */ |
| 163 | int /* error */ |
| 164 | xfs_alloc_pagf_init( |
| 165 | struct xfs_mount *mp, /* file system mount structure */ |
| 166 | struct xfs_trans *tp, /* transaction pointer */ |
| 167 | xfs_agnumber_t agno, /* allocation group number */ |
| 168 | int flags); /* XFS_ALLOC_FLAGS_... */ |
| 169 | |
| 170 | /* |
| 171 | * Put the block on the freelist for the allocation group. |
| 172 | */ |
| 173 | int /* error */ |
| 174 | xfs_alloc_put_freelist( |
| 175 | struct xfs_trans *tp, /* transaction pointer */ |
| 176 | struct xfs_buf *agbp, /* buffer for a.g. freelist header */ |
| 177 | struct xfs_buf *agflbp,/* buffer for a.g. free block array */ |
David Chinner | 92821e2 | 2007-05-24 15:26:31 +1000 | [diff] [blame] | 178 | xfs_agblock_t bno, /* block being freed */ |
| 179 | int btreeblk); /* owner was a AGF btree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /* |
| 182 | * Read in the allocation group header (free/alloc section). |
| 183 | */ |
| 184 | int /* error */ |
| 185 | xfs_alloc_read_agf( |
| 186 | struct xfs_mount *mp, /* mount point structure */ |
| 187 | struct xfs_trans *tp, /* transaction pointer */ |
| 188 | xfs_agnumber_t agno, /* allocation group number */ |
| 189 | int flags, /* XFS_ALLOC_FLAG_... */ |
| 190 | struct xfs_buf **bpp); /* buffer for the ag freelist header */ |
| 191 | |
| 192 | /* |
| 193 | * Allocate an extent (variable-size). |
| 194 | */ |
| 195 | int /* error */ |
| 196 | xfs_alloc_vextent( |
| 197 | xfs_alloc_arg_t *args); /* allocation argument structure */ |
| 198 | |
| 199 | /* |
| 200 | * Free an extent. |
| 201 | */ |
| 202 | int /* error */ |
| 203 | xfs_free_extent( |
| 204 | struct xfs_trans *tp, /* transaction pointer */ |
| 205 | xfs_fsblock_t bno, /* starting block number of extent */ |
| 206 | xfs_extlen_t len); /* length of extent */ |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | #endif /* __XFS_ALLOC_H__ */ |