ext2_inode_cnv.c revision 260629 
1/*-
2 * Copyright (c) 1995 The University of Utah and
3 * the Computer Systems Laboratory at the University of Utah (CSL).
4 * All rights reserved.
5 *
6 * Permission to use, copy, modify and distribute this software is hereby
7 * granted provided that (1) source code retains these copyright, permission,
8 * and disclaimer notices, and (2) redistributions including binaries
9 * reproduce the notices in supporting documentation, and (3) all advertising
10 * materials mentioning features or use of this software display the following
11 * acknowledgement: ``This product includes software developed by the
12 * Computer Systems Laboratory at the University of Utah.''
13 *
14 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
15 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
16 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
19 * improvements that they make and grant CSL redistribution rights.
20 *
21 *      Utah $Hdr$
22 * $FreeBSD: stable/10/sys/fs/ext2fs/ext2_inode_cnv.c 260629 2014-01-14 15:20:33Z pfg $
23 */
24
25/*
26 * routines to convert on disk ext2 inodes into inodes and back
27 */
28#include <sys/param.h>
29#include <sys/systm.h>
30#include <sys/endian.h>
31#include <sys/lock.h>
32#include <sys/stat.h>
33#include <sys/vnode.h>
34
35#include <fs/ext2fs/fs.h>
36#include <fs/ext2fs/inode.h>
37#include <fs/ext2fs/ext2fs.h>
38#include <fs/ext2fs/ext2_dinode.h>
39#include <fs/ext2fs/ext2_extern.h>
40
41#define XTIME_TO_NSEC(x)	((x & EXT3_NSEC_MASK) >> 2)
42#define NSEC_TO_XTIME(t)	(le32toh(t << 2) & EXT3_NSEC_MASK)
43
44void
45ext2_print_inode(struct inode *in)
46{
47	int i;
48	struct ext4_extent_header *ehp;
49	struct ext4_extent *ep;
50
51	printf( "Inode: %5ju", (uintmax_t)in->i_number);
52	printf( /* "Inode: %5d" */
53		" Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d\n",
54		"n/a", in->i_mode, in->i_flags, in->i_gen);
55	printf("User: %5u Group: %5u  Size: %ju\n",
56	    in->i_uid, in->i_gid, (uintmax_t)in->i_size);
57	printf("Links: %3d Blockcount: %ju\n",
58	    in->i_nlink, (uintmax_t)in->i_blocks);
59	printf( "ctime: 0x%x", in->i_ctime);
60	printf( "atime: 0x%x", in->i_atime);
61	printf( "mtime: 0x%x", in->i_mtime);
62	if (E2DI_HAS_XTIME(in))
63		printf("crtime %#x ", in->i_birthtime);
64	printf("BLOCKS:");
65	for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
66		printf("  %d", in->i_db[i]);
67	printf("\n");
68	printf("Extents:\n");
69	ehp = (struct ext4_extent_header *)in->i_db;
70	printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
71	    ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
72	    ehp->eh_gen);
73	ep = (struct ext4_extent *)(char *)(ehp + 1);
74	printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
75	    ep->e_len, ep->e_start_lo, ep->e_start_hi);
76	printf("\n");
77}
78
79/*
80 *	raw ext2 inode to inode
81 */
82void
83ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
84{
85        int i;
86
87	ip->i_nlink = ei->e2di_nlink;
88	/* Godmar thinks - if the link count is zero, then the inode is
89	   unused - according to ext2 standards. Ufs marks this fact
90	   by setting i_mode to zero - why ?
91	   I can see that this might lead to problems in an undelete.
92	*/
93	ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
94	ip->i_size = ei->e2di_size;
95	if (S_ISREG(ip->i_mode))
96		ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
97	ip->i_atime = ei->e2di_atime;
98	ip->i_mtime = ei->e2di_mtime;
99	ip->i_ctime = ei->e2di_ctime;
100	if (E2DI_HAS_XTIME(ip)) {
101		ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
102		ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
103		ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
104		ip->i_birthtime = ei->e2di_crtime;
105		ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
106	}
107	ip->i_flags = 0;
108	ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
109	ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
110	ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
111	ip->i_blocks = ei->e2di_nblock;
112	if (E2DI_HAS_HUGE_FILE(ip)) {
113		ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
114		if (ei->e2di_flags & EXT4_HUGE_FILE)
115		      ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
116	}
117	ip->i_gen = ei->e2di_gen;
118	ip->i_uid = ei->e2di_uid;
119	ip->i_gid = ei->e2di_gid;
120	/* XXX use memcpy */
121	for(i = 0; i < NDADDR; i++)
122		ip->i_db[i] = ei->e2di_blocks[i];
123	for(i = 0; i < NIADDR; i++)
124		ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
125}
126
127/*
128 *	inode to raw ext2 inode
129 */
130void
131ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
132{
133	int i;
134
135	ei->e2di_mode = ip->i_mode;
136	ei->e2di_nlink = ip->i_nlink;
137	/*
138	   Godmar thinks: if dtime is nonzero, ext2 says this inode
139	   has been deleted, this would correspond to a zero link count
140	 */
141	ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
142	ei->e2di_size = ip->i_size;
143	if (S_ISREG(ip->i_mode))
144		ei->e2di_size_high = ip->i_size >> 32;
145	ei->e2di_atime = ip->i_atime;
146	ei->e2di_mtime = ip->i_mtime;
147	ei->e2di_ctime = ip->i_ctime;
148	if (E2DI_HAS_XTIME(ip)) {
149		ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
150		ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
151		ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
152		ei->e2di_crtime = ip->i_birthtime;
153		ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
154	}
155	ei->e2di_flags = 0;
156	ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0;
157	ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
158	ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0;
159	ei->e2di_nblock = ip->i_blocks & 0xffffffff;
160	ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
161	ei->e2di_gen = ip->i_gen;
162	ei->e2di_uid = ip->i_uid;
163	ei->e2di_gid = ip->i_gid;
164	/* XXX use memcpy */
165	for(i = 0; i < NDADDR; i++)
166		ei->e2di_blocks[i] = ip->i_db[i];
167	for(i = 0; i < NIADDR; i++)
168		ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
169}
170