2 * Copyright (C) 2005-2011 Junjiro R. Okajima
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.
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.
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
19 #ifndef __AUFS_TYPE_H__
20 #define __AUFS_TYPE_H__
22 #include <linux/ioctl.h>
23 #include <linux/kernel.h>
24 #include <linux/limits.h>
26 #include <linux/types.h>
29 #include <sys/types.h>
32 #define AUFS_VERSION "3.x-rcN-20111205"
34 /* todo? move this to linux-2.6.19/include/magic.h */
35 #define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
37 /* ---------------------------------------------------------------------- */
39 #ifdef CONFIG_AUFS_BRANCH_MAX_127
40 typedef int8_t aufs_bindex_t;
41 #define AUFS_BRANCH_MAX 127
43 typedef int16_t aufs_bindex_t;
44 #ifdef CONFIG_AUFS_BRANCH_MAX_511
45 #define AUFS_BRANCH_MAX 511
46 #elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
47 #define AUFS_BRANCH_MAX 1023
48 #elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
49 #define AUFS_BRANCH_MAX 32767
54 #ifndef AUFS_BRANCH_MAX
55 #error unknown CONFIG_AUFS_BRANCH_MAX value
57 #endif /* __KERNEL__ */
59 /* ---------------------------------------------------------------------- */
61 #define AUFS_NAME "aufs"
62 #define AUFS_FSTYPE AUFS_NAME
64 #define AUFS_ROOT_INO 2
65 #define AUFS_FIRST_INO 11
67 #define AUFS_WH_PFX ".wh."
68 #define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1)
69 #define AUFS_WH_TMP_LEN 4
70 /* a limit for rmdir/rename a dir */
71 #define AUFS_MAX_NAMELEN (NAME_MAX \
72 - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\
74 - AUFS_WH_TMP_LEN) /* hex */
75 #define AUFS_XINO_FNAME "." AUFS_NAME ".xino"
76 #define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME
77 #define AUFS_XINO_TRUNC_INIT 64 /* blocks */
78 #define AUFS_XINO_TRUNC_STEP 4 /* blocks */
79 #define AUFS_DIRWH_DEF 3
80 #define AUFS_RDCACHE_DEF 10 /* seconds */
81 #define AUFS_RDCACHE_MAX 3600 /* seconds */
82 #define AUFS_RDBLK_DEF 512 /* bytes */
83 #define AUFS_RDHASH_DEF 32
84 #define AUFS_WKQ_NAME AUFS_NAME "d"
85 #define AUFS_MFS_DEF_SEC 30 /* seconds */
86 #define AUFS_MFS_MAX_SEC 3600 /* seconds */
87 #define AUFS_PLINK_WARN 100 /* number of plinks */
89 /* pseudo-link maintenace under /proc */
90 #define AUFS_PLINK_MAINT_NAME "plink_maint"
91 #define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME
92 #define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME
94 #define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */
95 #define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME
97 #define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME
98 #define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk"
99 #define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph"
101 /* doubly whiteouted */
102 #define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME
103 #define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME
104 #define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME
106 /* branch permissions and attributes */
107 #define AUFS_BRPERM_RW "rw"
108 #define AUFS_BRPERM_RO "ro"
109 #define AUFS_BRPERM_RR "rr"
110 #define AUFS_BRRATTR_WH "wh"
111 #define AUFS_BRWATTR_NLWH "nolwh"
113 /* ---------------------------------------------------------------------- */
117 /* readdir in userspace */
121 /* pathconf wrapper */
128 /* borrowed from linux/include/linux/kernel.h */
130 #define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
131 #define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
134 /* borrowed from linux/include/linux/compiler-gcc3.h */
136 #define __aligned(x) __attribute__((aligned(x)))
141 #define __packed __attribute__((packed))
145 struct au_rdu_cookie {
162 static inline int au_rdu_len(int nlen)
164 /* include the terminating NULL */
165 return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
169 union au_rdu_ent_ul {
170 struct au_rdu_ent __user *e;
182 uint64_t sz; /* AuCtl_RDU */
183 uint64_t nent; /* AuCtl_RDU_INO */
185 union au_rdu_ent_ul ent;
186 uint16_t verify[AufsCtlRduV_End];
192 union au_rdu_ent_ul tail;
193 /* number of entries which were added in a single call */
198 struct au_rdu_cookie cookie;
201 /* ---------------------------------------------------------------------- */
208 /* ---------------------------------------------------------------------- */
215 /* ---------------------------------------------------------------------- */
217 #define AuCtlType 'A'
218 #define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
219 #define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
220 #define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \
222 #define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy)
224 #endif /* __AUFS_TYPE_H__ */