1 /* 2 * Copyright (C) 2005-2012 Junjiro R. Okajima 3 * 4 * This program, aufs is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will 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 to the Free Software 16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 #ifndef __AUFS_TYPE_H__ 20 #define __AUFS_TYPE_H__ 21 22 #define AUFS_NAME "aufs" 23 24 #include <stdint.h> 25 #include <sys/types.h> 26 27 #include <linux/limits.h> 28 29 #define AUFS_VERSION "3.2-20120109" 30 31 /* todo? move this to linux-2.6.19/include/magic.h */ 32 #define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') 33 34 /* ---------------------------------------------------------------------- */ 35 36 #ifdef CONFIG_AUFS_BRANCH_MAX_127 37 typedef int8_t aufs_bindex_t; 38 #define AUFS_BRANCH_MAX 127 39 #else 40 typedef int16_t aufs_bindex_t; 41 #ifdef CONFIG_AUFS_BRANCH_MAX_511 42 #define AUFS_BRANCH_MAX 511 43 #elif defined(CONFIG_AUFS_BRANCH_MAX_1023) 44 #define AUFS_BRANCH_MAX 1023 45 #elif defined(CONFIG_AUFS_BRANCH_MAX_32767) 46 #define AUFS_BRANCH_MAX 32767 47 #endif 48 #endif 49 50 51 /* ---------------------------------------------------------------------- */ 52 53 #define AUFS_FSTYPE AUFS_NAME 54 55 #define AUFS_ROOT_INO 2 56 #define AUFS_FIRST_INO 11 57 58 #define AUFS_WH_PFX ".wh." 59 #define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) 60 #define AUFS_WH_TMP_LEN 4 61 /* a limit for rmdir/rename a dir */ 62 #define AUFS_MAX_NAMELEN (NAME_MAX \ 63 - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ 64 - 1 /* dot */\ 65 - AUFS_WH_TMP_LEN) /* hex */ 66 #define AUFS_XINO_FNAME "." AUFS_NAME ".xino" 67 #define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME 68 #define AUFS_XINO_TRUNC_INIT 64 /* blocks */ 69 #define AUFS_XINO_TRUNC_STEP 4 /* blocks */ 70 #define AUFS_DIRWH_DEF 3 71 #define AUFS_RDCACHE_DEF 10 /* seconds */ 72 #define AUFS_RDCACHE_MAX 3600 /* seconds */ 73 #define AUFS_RDBLK_DEF 512 /* bytes */ 74 #define AUFS_RDHASH_DEF 32 75 #define AUFS_WKQ_NAME AUFS_NAME "d" 76 #define AUFS_MFS_DEF_SEC 30 /* seconds */ 77 #define AUFS_MFS_MAX_SEC 3600 /* seconds */ 78 #define AUFS_PLINK_WARN 100 /* number of plinks */ 79 80 /* pseudo-link maintenace under /proc */ 81 #define AUFS_PLINK_MAINT_NAME "plink_maint" 82 #define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME 83 #define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME 84 85 #define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ 86 #define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME 87 88 #define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME 89 #define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" 90 #define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" 91 92 /* doubly whiteouted */ 93 #define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME 94 #define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME 95 #define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME 96 97 /* branch permissions and attributes */ 98 #define AUFS_BRPERM_RW "rw" 99 #define AUFS_BRPERM_RO "ro" 100 #define AUFS_BRPERM_RR "rr" 101 #define AUFS_BRRATTR_WH "wh" 102 #define AUFS_BRWATTR_NLWH "nolwh" 103 104 /* ---------------------------------------------------------------------- */ 105 106 /* ioctl */ 107 enum { 108 /* readdir in userspace */ 109 AuCtl_RDU, 110 AuCtl_RDU_INO, 111 112 /* pathconf wrapper */ 113 AuCtl_WBR_FD, 114 115 /* busy inode */ 116 AuCtl_IBUSY 117 }; 118 119 /* borrowed from linux/include/linux/kernel.h */ 120 #ifndef ALIGN 121 #define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) 122 #define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) 123 #endif 124 125 /* borrowed from linux/include/linux/compiler-gcc3.h */ 126 #ifndef __aligned 127 #define __aligned(x) __attribute__((aligned(x))) 128 #endif 129 130 131 struct au_rdu_cookie { 132 uint64_t h_pos; 133 int16_t bindex; 134 uint8_t flags; 135 uint8_t pad; 136 uint32_t generation; 137 } __aligned(8); 138 139 struct au_rdu_ent { 140 uint64_t ino; 141 int16_t bindex; 142 uint8_t type; 143 uint8_t nlen; 144 uint8_t wh; 145 char name[0]; 146 } __aligned(8); 147 148 static __inline__ int au_rdu_len(int nlen) 149 { 150 /* include the terminating NULL */ 151 return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, 152 sizeof(uint64_t)); 153 } 154 155 union au_rdu_ent_ul { 156 struct au_rdu_ent *e; 157 uint64_t ul; 158 }; 159 160 enum { 161 AufsCtlRduV_SZ, 162 AufsCtlRduV_End 163 }; 164 165 struct aufs_rdu { 166 /* input */ 167 union { 168 uint64_t sz; /* AuCtl_RDU */ 169 uint64_t nent; /* AuCtl_RDU_INO */ 170 }; 171 union au_rdu_ent_ul ent; 172 uint16_t verify[AufsCtlRduV_End]; 173 174 /* input/output */ 175 uint32_t blk; 176 177 /* output */ 178 union au_rdu_ent_ul tail; 179 /* number of entries which were added in a single call */ 180 uint64_t rent; 181 uint8_t full; 182 uint8_t shwh; 183 184 struct au_rdu_cookie cookie; 185 } __aligned(8); 186 187 /* ---------------------------------------------------------------------- */ 188 189 struct aufs_wbr_fd { 190 uint32_t oflags; 191 int16_t brid; 192 } __aligned(8); 193 194 /* ---------------------------------------------------------------------- */ 195 196 struct aufs_ibusy { 197 uint64_t ino, h_ino; 198 int16_t bindex; 199 } __aligned(8); 200 201 /* ---------------------------------------------------------------------- */ 202 203 #define AuCtlType 'A' 204 #define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) 205 #define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) 206 #define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \ 207 struct aufs_wbr_fd) 208 #define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) 209 210 #endif /* __AUFS_TYPE_H__ */ 211
