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
170 lines
5.7 KiB
C
170 lines
5.7 KiB
C
/*-
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* Copyright (c) 1995 The University of Utah and
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* the Computer Systems Laboratory at the University of Utah (CSL).
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* All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software is hereby
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* granted provided that (1) source code retains these copyright, permission,
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* and disclaimer notices, and (2) redistributions including binaries
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* reproduce the notices in supporting documentation, and (3) all advertising
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* materials mentioning features or use of this software display the following
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* acknowledgement: ``This product includes software developed by the
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* Computer Systems Laboratory at the University of Utah.''
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*
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* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
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* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
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* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* CSL requests users of this software to return to csl-dist@cs.utah.edu any
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* improvements that they make and grant CSL redistribution rights.
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*
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* Utah $Hdr$
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* $FreeBSD$
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*/
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/*
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* routines to convert on disk ext2 inodes into inodes and back
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/endian.h>
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#include <sys/lock.h>
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#include <sys/stat.h>
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#include <sys/vnode.h>
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#include <fs/ext2fs/fs.h>
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#include <fs/ext2fs/inode.h>
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#include <fs/ext2fs/ext2fs.h>
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#include <fs/ext2fs/ext2_dinode.h>
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#include <fs/ext2fs/ext2_extern.h>
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#define XTIME_TO_NSEC(x) ((x & EXT3_NSEC_MASK) >> 2)
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#define NSEC_TO_XTIME(t) (le32toh(t << 2) & EXT3_NSEC_MASK)
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void
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ext2_print_inode(struct inode *in)
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{
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int i;
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struct ext4_extent_header *ehp;
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struct ext4_extent *ep;
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printf( "Inode: %5ju", (uintmax_t)in->i_number);
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printf( /* "Inode: %5d" */
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" Type: %10s Mode: 0x%o Flags: 0x%x Version: %d\n",
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"n/a", in->i_mode, in->i_flags, in->i_gen);
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printf("User: %5u Group: %5u Size: %ju\n",
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in->i_uid, in->i_gid, (uintmax_t)in->i_size);
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printf("Links: %3d Blockcount: %ju\n",
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in->i_nlink, (uintmax_t)in->i_blocks);
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printf( "ctime: 0x%x", in->i_ctime);
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printf( "atime: 0x%x", in->i_atime);
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printf( "mtime: 0x%x", in->i_mtime);
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if (E2DI_HAS_XTIME(in))
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printf("crtime %#x ", in->i_birthtime);
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printf("BLOCKS:");
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for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
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printf(" %d", in->i_db[i]);
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printf("\n");
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printf("Extents:\n");
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ehp = (struct ext4_extent_header *)in->i_db;
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printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
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ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
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ehp->eh_gen);
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ep = (struct ext4_extent *)(char *)(ehp + 1);
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printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
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ep->e_len, ep->e_start_lo, ep->e_start_hi);
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printf("\n");
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}
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/*
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* raw ext2 inode to inode
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*/
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void
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ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
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{
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int i;
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ip->i_nlink = ei->e2di_nlink;
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/* Godmar thinks - if the link count is zero, then the inode is
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unused - according to ext2 standards. Ufs marks this fact
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by setting i_mode to zero - why ?
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I can see that this might lead to problems in an undelete.
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*/
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ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
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ip->i_size = ei->e2di_size;
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if (S_ISREG(ip->i_mode))
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ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
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ip->i_atime = ei->e2di_atime;
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ip->i_mtime = ei->e2di_mtime;
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ip->i_ctime = ei->e2di_ctime;
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if (E2DI_HAS_XTIME(ip)) {
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ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
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ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
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ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
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ip->i_birthtime = ei->e2di_crtime;
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ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
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}
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ip->i_flags = ei->e2di_flags;
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ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
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ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
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ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
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ip->i_blocks = ei->e2di_nblock;
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if (E2DI_HAS_HUGE_FILE(ip)) {
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ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
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if (ei->e2di_flags & EXT4_HUGE_FILE)
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ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
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}
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ip->i_gen = ei->e2di_gen;
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ip->i_uid = ei->e2di_uid;
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ip->i_gid = ei->e2di_gid;
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/* XXX use memcpy */
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for(i = 0; i < NDADDR; i++)
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ip->i_db[i] = ei->e2di_blocks[i];
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for(i = 0; i < NIADDR; i++)
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ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
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}
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/*
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* inode to raw ext2 inode
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*/
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void
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ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
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{
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int i;
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ei->e2di_mode = ip->i_mode;
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ei->e2di_nlink = ip->i_nlink;
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/*
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Godmar thinks: if dtime is nonzero, ext2 says this inode
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has been deleted, this would correspond to a zero link count
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*/
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ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
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ei->e2di_size = ip->i_size;
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if (S_ISREG(ip->i_mode))
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ei->e2di_size_high = ip->i_size >> 32;
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ei->e2di_atime = ip->i_atime;
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ei->e2di_mtime = ip->i_mtime;
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ei->e2di_ctime = ip->i_ctime;
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if (E2DI_HAS_XTIME(ip)) {
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ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
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ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
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ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
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ei->e2di_crtime = ip->i_birthtime;
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ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
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}
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ei->e2di_flags = ip->i_flags;
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ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0;
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ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
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ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0;
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ei->e2di_nblock = ip->i_blocks & 0xffffffff;
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ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
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ei->e2di_gen = ip->i_gen;
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ei->e2di_uid = ip->i_uid;
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ei->e2di_gid = ip->i_gid;
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/* XXX use memcpy */
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for(i = 0; i < NDADDR; i++)
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ei->e2di_blocks[i] = ip->i_db[i];
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for(i = 0; i < NIADDR; i++)
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ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
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}
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