mirror of https://gitee.com/openkylin/linux.git
244 lines
9.1 KiB
C
244 lines
9.1 KiB
C
/*
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* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_DINODE_H__
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#define __XFS_DINODE_H__
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#define XFS_DINODE_MAGIC 0x494e /* 'IN' */
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#define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3)
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typedef struct xfs_timestamp {
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__be32 t_sec; /* timestamp seconds */
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__be32 t_nsec; /* timestamp nanoseconds */
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} xfs_timestamp_t;
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/*
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* On-disk inode structure.
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*
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* This is just the header or "dinode core", the inode is expanded to fill a
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* variable size the leftover area split into a data and an attribute fork.
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* The format of the data and attribute fork depends on the format of the
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* inode as indicated by di_format and di_aformat. To access the data and
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* attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
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* below.
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*
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* There is a very similar struct icdinode in xfs_inode which matches the
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* layout of the first 96 bytes of this structure, but is kept in native
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* format instead of big endian.
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*
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* Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
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* padding field for v3 inodes.
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*/
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typedef struct xfs_dinode {
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__be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
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__be16 di_mode; /* mode and type of file */
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__u8 di_version; /* inode version */
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__u8 di_format; /* format of di_c data */
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__be16 di_onlink; /* old number of links to file */
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__be32 di_uid; /* owner's user id */
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__be32 di_gid; /* owner's group id */
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__be32 di_nlink; /* number of links to file */
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__be16 di_projid_lo; /* lower part of owner's project id */
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__be16 di_projid_hi; /* higher part owner's project id */
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__u8 di_pad[6]; /* unused, zeroed space */
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__be16 di_flushiter; /* incremented on flush */
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xfs_timestamp_t di_atime; /* time last accessed */
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xfs_timestamp_t di_mtime; /* time last modified */
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xfs_timestamp_t di_ctime; /* time created/inode modified */
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__be64 di_size; /* number of bytes in file */
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__be64 di_nblocks; /* # of direct & btree blocks used */
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__be32 di_extsize; /* basic/minimum extent size for file */
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__be32 di_nextents; /* number of extents in data fork */
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__be16 di_anextents; /* number of extents in attribute fork*/
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__u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
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__s8 di_aformat; /* format of attr fork's data */
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__be32 di_dmevmask; /* DMIG event mask */
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__be16 di_dmstate; /* DMIG state info */
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__be16 di_flags; /* random flags, XFS_DIFLAG_... */
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__be32 di_gen; /* generation number */
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/* di_next_unlinked is the only non-core field in the old dinode */
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__be32 di_next_unlinked;/* agi unlinked list ptr */
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/* start of the extended dinode, writable fields */
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__le32 di_crc; /* CRC of the inode */
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__be64 di_changecount; /* number of attribute changes */
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__be64 di_lsn; /* flush sequence */
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__be64 di_flags2; /* more random flags */
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__u8 di_pad2[16]; /* more padding for future expansion */
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/* fields only written to during inode creation */
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xfs_timestamp_t di_crtime; /* time created */
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__be64 di_ino; /* inode number */
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uuid_t di_uuid; /* UUID of the filesystem */
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/* structure must be padded to 64 bit alignment */
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} xfs_dinode_t;
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#define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
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#define DI_MAX_FLUSH 0xffff
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/*
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* Size of the core inode on disk. Version 1 and 2 inodes have
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* the same size, but version 3 has grown a few additional fields.
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*/
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static inline uint xfs_dinode_size(int version)
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{
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if (version == 3)
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return sizeof(struct xfs_dinode);
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return offsetof(struct xfs_dinode, di_crc);
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}
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/*
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* The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
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* Since the pathconf interface is signed, we use 2^31 - 1 instead.
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* The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
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*/
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#define XFS_MAXLINK ((1U << 31) - 1U)
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#define XFS_MAXLINK_1 65535U
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/*
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* Values for di_format
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*/
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typedef enum xfs_dinode_fmt {
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XFS_DINODE_FMT_DEV, /* xfs_dev_t */
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XFS_DINODE_FMT_LOCAL, /* bulk data */
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XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
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XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
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XFS_DINODE_FMT_UUID /* uuid_t */
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} xfs_dinode_fmt_t;
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/*
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* Inode minimum and maximum sizes.
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*/
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#define XFS_DINODE_MIN_LOG 8
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#define XFS_DINODE_MAX_LOG 11
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#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
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#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
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/*
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* Inode size for given fs.
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*/
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#define XFS_LITINO(mp, version) \
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((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
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/*
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* Inode data & attribute fork sizes, per inode.
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*/
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#define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
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#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
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#define XFS_DFORK_DSIZE(dip,mp) \
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(XFS_DFORK_Q(dip) ? \
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XFS_DFORK_BOFF(dip) : \
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XFS_LITINO(mp, (dip)->di_version))
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#define XFS_DFORK_ASIZE(dip,mp) \
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(XFS_DFORK_Q(dip) ? \
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XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
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0)
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#define XFS_DFORK_SIZE(dip,mp,w) \
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((w) == XFS_DATA_FORK ? \
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XFS_DFORK_DSIZE(dip, mp) : \
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XFS_DFORK_ASIZE(dip, mp))
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/*
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* Return pointers to the data or attribute forks.
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*/
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#define XFS_DFORK_DPTR(dip) \
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((char *)dip + xfs_dinode_size(dip->di_version))
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#define XFS_DFORK_APTR(dip) \
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(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
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#define XFS_DFORK_PTR(dip,w) \
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((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
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#define XFS_DFORK_FORMAT(dip,w) \
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((w) == XFS_DATA_FORK ? \
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(dip)->di_format : \
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(dip)->di_aformat)
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#define XFS_DFORK_NEXTENTS(dip,w) \
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((w) == XFS_DATA_FORK ? \
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be32_to_cpu((dip)->di_nextents) : \
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be16_to_cpu((dip)->di_anextents))
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#define XFS_BUF_TO_DINODE(bp) ((xfs_dinode_t *)((bp)->b_addr))
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/*
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* For block and character special files the 32bit dev_t is stored at the
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* beginning of the data fork.
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*/
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static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
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{
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return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
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}
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static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
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{
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*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
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}
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/*
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* Values for di_flags
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* There should be a one-to-one correspondence between these flags and the
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* XFS_XFLAG_s.
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*/
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#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
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#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
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#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
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#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
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#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
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#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
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#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
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#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
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#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
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#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
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#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
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#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
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#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
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#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
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#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
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#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
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#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
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#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
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#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
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#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
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#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
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#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
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#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
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#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
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#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
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#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
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#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
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#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
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#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
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#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
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#ifdef CONFIG_XFS_RT
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#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
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#else
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#define XFS_IS_REALTIME_INODE(ip) (0)
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#endif
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#define XFS_DIFLAG_ANY \
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(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
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XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
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XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
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XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
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XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
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#endif /* __XFS_DINODE_H__ */
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