d7511a40a7
Basic support for extents was implemented by Zheng Liu as part of his Google Summer of Code in 2010. This support is read-only at this time. In addition to extents we also support the huge_file extension for read-only purposes. This works nicely with the additional support for birthtime/nanosec timestamps and dir_index that have been added lately. The implementation may not work for all ext4 filesystems as it doesn't support some features that are being enabled by default on recent linux like flex_bg. Nevertheless, the feature should be very useful for migration or simple access in filesystems that have been converted from ext2/3 or don't use incompatible features. Special thanks to Zheng Liu for his dedication and continued work to support ext2 in FreeBSD. Submitted by: Zheng Liu (lz@) Reviewed by: Mike Ma, Christoph Mallon (previous version) Sponsored by: Google Inc. MFC after: 3 weeks
180 lines
6.8 KiB
C
180 lines
6.8 KiB
C
/*-
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)inode.h 8.9 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#ifndef _FS_EXT2FS_INODE_H_
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#define _FS_EXT2FS_INODE_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <fs/ext2fs/ext2_extents.h>
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/*
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* This must agree with the definition in <ufs/ufs/dir.h>.
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*/
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#define doff_t int32_t
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#define NDADDR 12 /* Direct addresses in inode. */
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#define NIADDR 3 /* Indirect addresses in inode. */
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/*
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* The size of physical and logical block numbers and time fields in UFS.
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*/
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typedef int32_t e2fs_lbn_t;
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/*
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* The inode is used to describe each active (or recently active) file in the
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* EXT2FS filesystem. It is composed of two types of information. The first
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* part is the information that is needed only while the file is active (such
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* as the identity of the file and linkage to speed its lookup). The second
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* part is the permanent meta-data associated with the file which is read in
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* from the permanent dinode from long term storage when the file becomes
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* active, and is put back when the file is no longer being used.
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*/
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struct inode {
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struct vnode *i_vnode;/* Vnode associated with this inode. */
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struct ext2mount *i_ump;
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uint32_t i_flag; /* flags, see below */
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ino_t i_number; /* The identity of the inode. */
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struct m_ext2fs *i_e2fs; /* EXT2FS */
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u_quad_t i_modrev; /* Revision level for NFS lease. */
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/*
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* Side effects; used during directory lookup.
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*/
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int32_t i_count; /* Size of free slot in directory. */
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doff_t i_endoff; /* End of useful stuff in directory. */
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doff_t i_diroff; /* Offset in dir, where we found last entry. */
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doff_t i_offset; /* Offset of free space in directory. */
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uint32_t i_block_group;
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uint32_t i_next_alloc_block;
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uint32_t i_next_alloc_goal;
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/* Fields from struct dinode in UFS. */
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uint16_t i_mode; /* IFMT, permissions; see below. */
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int16_t i_nlink; /* File link count. */
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uint32_t i_uid; /* File owner. */
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uint32_t i_gid; /* File group. */
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uint64_t i_size; /* File byte count. */
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uint64_t i_blocks; /* Blocks actually held. */
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int32_t i_atime; /* Last access time. */
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int32_t i_mtime; /* Last modified time. */
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int32_t i_ctime; /* Last inode change time. */
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int32_t i_birthtime; /* Inode creation time. */
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int32_t i_mtimensec; /* Last modified time. */
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int32_t i_atimensec; /* Last access time. */
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int32_t i_ctimensec; /* Last inode change time. */
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int32_t i_birthnsec; /* Inode creation time. */
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uint32_t i_gen; /* Generation number. */
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uint32_t i_flags; /* Status flags (chflags). */
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uint32_t i_db[NDADDR]; /* Direct disk blocks. */
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uint32_t i_ib[NIADDR]; /* Indirect disk blocks. */
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struct ext4_extent_cache i_ext_cache; /* cache for ext4 extent */
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};
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/*
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* The di_db fields may be overlaid with other information for
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* file types that do not have associated disk storage. Block
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* and character devices overlay the first data block with their
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* dev_t value. Short symbolic links place their path in the
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* di_db area.
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*/
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#define i_shortlink i_db
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#define i_rdev i_db[0]
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/* File permissions. */
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#define IEXEC 0000100 /* Executable. */
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#define IWRITE 0000200 /* Writeable. */
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#define IREAD 0000400 /* Readable. */
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#define ISVTX 0001000 /* Sticky bit. */
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#define ISGID 0002000 /* Set-gid. */
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#define ISUID 0004000 /* Set-uid. */
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/* File types. */
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#define IFMT 0170000 /* Mask of file type. */
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#define IFIFO 0010000 /* Named pipe (fifo). */
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#define IFCHR 0020000 /* Character device. */
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#define IFDIR 0040000 /* Directory file. */
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#define IFBLK 0060000 /* Block device. */
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#define IFREG 0100000 /* Regular file. */
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#define IFLNK 0120000 /* Symbolic link. */
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#define IFSOCK 0140000 /* UNIX domain socket. */
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#define IFWHT 0160000 /* Whiteout. */
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/* These flags are kept in i_flag. */
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#define IN_ACCESS 0x0001 /* Access time update request. */
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#define IN_CHANGE 0x0002 /* Inode change time update request. */
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#define IN_UPDATE 0x0004 /* Modification time update request. */
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#define IN_MODIFIED 0x0008 /* Inode has been modified. */
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#define IN_RENAME 0x0010 /* Inode is being renamed. */
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#define IN_HASHED 0x0020 /* Inode is on hash list */
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#define IN_LAZYMOD 0x0040 /* Modified, but don't write yet. */
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#define IN_SPACECOUNTED 0x0080 /* Blocks to be freed in free count. */
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#define IN_LAZYACCESS 0x0100 /* Process IN_ACCESS after the
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suspension finished */
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#define i_devvp i_ump->um_devvp
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#ifdef _KERNEL
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/*
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* Structure used to pass around logical block paths generated by
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* ext2_getlbns and used by truncate and bmap code.
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*/
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struct indir {
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e2fs_lbn_t in_lbn; /* Logical block number. */
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int in_off; /* Offset in buffer. */
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};
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/* Convert between inode pointers and vnode pointers. */
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#define VTOI(vp) ((struct inode *)(vp)->v_data)
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#define ITOV(ip) ((ip)->i_vnode)
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/* This overlays the fid structure (see mount.h). */
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struct ufid {
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uint16_t ufid_len; /* Length of structure. */
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uint16_t ufid_pad; /* Force 32-bit alignment. */
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ino_t ufid_ino; /* File number (ino). */
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uint32_t ufid_gen; /* Generation number. */
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};
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#endif /* _KERNEL */
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#endif /* !_FS_EXT2FS_INODE_H_ */
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