| /* |
| * Copyright (C) 2005-2012 Junjiro R. Okajima |
| * |
| * This program, aufs is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef __AUFS_TYPE_H__ |
| #define __AUFS_TYPE_H__ |
| |
| #define AUFS_NAME "aufs" |
| |
| #include <stdint.h> |
| #include <sys/types.h> |
| |
| #include <linux/limits.h> |
| |
| #define AUFS_VERSION "3.2-20120109" |
| |
| /* todo? move this to linux-2.6.19/include/magic.h */ |
| #define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| #ifdef CONFIG_AUFS_BRANCH_MAX_127 |
| typedef int8_t aufs_bindex_t; |
| #define AUFS_BRANCH_MAX 127 |
| #else |
| typedef int16_t aufs_bindex_t; |
| #ifdef CONFIG_AUFS_BRANCH_MAX_511 |
| #define AUFS_BRANCH_MAX 511 |
| #elif defined(CONFIG_AUFS_BRANCH_MAX_1023) |
| #define AUFS_BRANCH_MAX 1023 |
| #elif defined(CONFIG_AUFS_BRANCH_MAX_32767) |
| #define AUFS_BRANCH_MAX 32767 |
| #endif |
| #endif |
| |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| #define AUFS_FSTYPE AUFS_NAME |
| |
| #define AUFS_ROOT_INO 2 |
| #define AUFS_FIRST_INO 11 |
| |
| #define AUFS_WH_PFX ".wh." |
| #define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) |
| #define AUFS_WH_TMP_LEN 4 |
| /* a limit for rmdir/rename a dir */ |
| #define AUFS_MAX_NAMELEN (NAME_MAX \ |
| - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ |
| - 1 /* dot */\ |
| - AUFS_WH_TMP_LEN) /* hex */ |
| #define AUFS_XINO_FNAME "." AUFS_NAME ".xino" |
| #define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME |
| #define AUFS_XINO_TRUNC_INIT 64 /* blocks */ |
| #define AUFS_XINO_TRUNC_STEP 4 /* blocks */ |
| #define AUFS_DIRWH_DEF 3 |
| #define AUFS_RDCACHE_DEF 10 /* seconds */ |
| #define AUFS_RDCACHE_MAX 3600 /* seconds */ |
| #define AUFS_RDBLK_DEF 512 /* bytes */ |
| #define AUFS_RDHASH_DEF 32 |
| #define AUFS_WKQ_NAME AUFS_NAME "d" |
| #define AUFS_MFS_DEF_SEC 30 /* seconds */ |
| #define AUFS_MFS_MAX_SEC 3600 /* seconds */ |
| #define AUFS_PLINK_WARN 100 /* number of plinks */ |
| |
| /* pseudo-link maintenace under /proc */ |
| #define AUFS_PLINK_MAINT_NAME "plink_maint" |
| #define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME |
| #define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME |
| |
| #define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ |
| #define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME |
| |
| #define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME |
| #define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" |
| #define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" |
| |
| /* doubly whiteouted */ |
| #define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME |
| #define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME |
| #define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME |
| |
| /* branch permissions and attributes */ |
| #define AUFS_BRPERM_RW "rw" |
| #define AUFS_BRPERM_RO "ro" |
| #define AUFS_BRPERM_RR "rr" |
| #define AUFS_BRRATTR_WH "wh" |
| #define AUFS_BRWATTR_NLWH "nolwh" |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| /* ioctl */ |
| enum { |
| /* readdir in userspace */ |
| AuCtl_RDU, |
| AuCtl_RDU_INO, |
| |
| /* pathconf wrapper */ |
| AuCtl_WBR_FD, |
| |
| /* busy inode */ |
| AuCtl_IBUSY |
| }; |
| |
| /* borrowed from linux/include/linux/kernel.h */ |
| #ifndef ALIGN |
| #define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) |
| #define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) |
| #endif |
| |
| /* borrowed from linux/include/linux/compiler-gcc3.h */ |
| #ifndef __aligned |
| #define __aligned(x) __attribute__((aligned(x))) |
| #endif |
| |
| |
| struct au_rdu_cookie { |
| uint64_t h_pos; |
| int16_t bindex; |
| uint8_t flags; |
| uint8_t pad; |
| uint32_t generation; |
| } __aligned(8); |
| |
| struct au_rdu_ent { |
| uint64_t ino; |
| int16_t bindex; |
| uint8_t type; |
| uint8_t nlen; |
| uint8_t wh; |
| char name[0]; |
| } __aligned(8); |
| |
| static __inline__ int au_rdu_len(int nlen) |
| { |
| /* include the terminating NULL */ |
| return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, |
| sizeof(uint64_t)); |
| } |
| |
| union au_rdu_ent_ul { |
| struct au_rdu_ent *e; |
| uint64_t ul; |
| }; |
| |
| enum { |
| AufsCtlRduV_SZ, |
| AufsCtlRduV_End |
| }; |
| |
| struct aufs_rdu { |
| /* input */ |
| union { |
| uint64_t sz; /* AuCtl_RDU */ |
| uint64_t nent; /* AuCtl_RDU_INO */ |
| }; |
| union au_rdu_ent_ul ent; |
| uint16_t verify[AufsCtlRduV_End]; |
| |
| /* input/output */ |
| uint32_t blk; |
| |
| /* output */ |
| union au_rdu_ent_ul tail; |
| /* number of entries which were added in a single call */ |
| uint64_t rent; |
| uint8_t full; |
| uint8_t shwh; |
| |
| struct au_rdu_cookie cookie; |
| } __aligned(8); |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| struct aufs_wbr_fd { |
| uint32_t oflags; |
| int16_t brid; |
| } __aligned(8); |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| struct aufs_ibusy { |
| uint64_t ino, h_ino; |
| int16_t bindex; |
| } __aligned(8); |
| |
| /* ---------------------------------------------------------------------- */ |
| |
| #define AuCtlType 'A' |
| #define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) |
| #define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) |
| #define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \ |
| struct aufs_wbr_fd) |
| #define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) |
| |
| #endif /* __AUFS_TYPE_H__ */ |