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/*
* Copyright (C) 2005-2014 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, see <http://www.gnu.org/licenses/>.
*/
#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 "3.13-20140303"
/* 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 and copyup */
#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_DEF_SEC 30 /* seconds */
#define AUFS_XINO_DEF_TRUNC 45 /* percentage */
#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 50 /* number of plinks in a single bucket */
/* 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"
#define AUFS_BRATTR_UNPIN "unpin"
/* ---------------------------------------------------------------------- */
/* ioctl */
enum {
/* readdir in userspace */
AuCtl_RDU,
AuCtl_RDU_INO,
/* pathconf wrapper */
AuCtl_WBR_FD,
/* busy inode */
AuCtl_IBUSY,
/* move-down */
AuCtl_MVDOWN
};
/* 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);
/* ---------------------------------------------------------------------- */
/* error code for move-down */
/* the actual message strings are implemented in aufs-util.git */
enum {
EAU_MVDOWN_OPAQUE = 1,
EAU_MVDOWN_WHITEOUT,
EAU_MVDOWN_UPPER,
EAU_MVDOWN_BOTTOM,
EAU_MVDOWN_NOUPPER,
EAU_MVDOWN_NOLOWERBR,
EAU_Last
};
/* flags for move-down */
#define AUFS_MVDOWN_DMSG 1
#define AUFS_MVDOWN_OWLOWER (1 << 1) /* overwrite lower */
#define AUFS_MVDOWN_KUPPER (1 << 2) /* keep upper */
#define AUFS_MVDOWN_ROLOWER (1 << 3) /* do even if lower is RO */
#define AUFS_MVDOWN_ROLOWER_R (1 << 4) /* did on lower RO */
#define AUFS_MVDOWN_ROUPPER (1 << 5) /* do even if upper is RO */
#define AUFS_MVDOWN_ROUPPER_R (1 << 6) /* did on upper RO */
#define AUFS_MVDOWN_BRID_UPPER (1 << 7) /* upper brid */
#define AUFS_MVDOWN_BRID_LOWER (1 << 8) /* lower brid */
/* will be added more */
enum {
AUFS_MVDOWN_UPPER,
AUFS_MVDOWN_LOWER,
AUFS_MVDOWN_NARRAY
};
struct aufs_mvdown {
uint32_t flags;
struct {
int16_t bindex;
int16_t brid;
} a[AUFS_MVDOWN_NARRAY];
int8_t au_errno;
/* will be added more */
} __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)
#define AUFS_CTL_MVDOWN _IOWR(AuCtlType, AuCtl_MVDOWN, \
struct aufs_mvdown)
#endif /* __AUFS_TYPE_H__ */