xref: /freebsd/sys/fs/ext2fs/ext2_inode_cnv.c (revision 0e97acdf58fe27b09c4824a474b0344daf997c5f)
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  * $FreeBSD$
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 
44 void
45 ext2_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  */
82 void
83 ext2_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_flag |= (ei->e2di_flags & EXT4_INDEX) ? IN_E4INDEX : 0;
112 	ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
113 	ip->i_blocks = ei->e2di_nblock;
114 	if (E2DI_HAS_HUGE_FILE(ip)) {
115 		ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
116 		if (ei->e2di_flags & EXT4_HUGE_FILE)
117 		      ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
118 	}
119 	ip->i_gen = ei->e2di_gen;
120 	ip->i_uid = ei->e2di_uid;
121 	ip->i_gid = ei->e2di_gid;
122 	/* XXX use memcpy */
123 	for(i = 0; i < NDADDR; i++)
124 		ip->i_db[i] = ei->e2di_blocks[i];
125 	for(i = 0; i < NIADDR; i++)
126 		ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
127 }
128 
129 /*
130  *	inode to raw ext2 inode
131  */
132 void
133 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
134 {
135 	int i;
136 
137 	ei->e2di_mode = ip->i_mode;
138 	ei->e2di_nlink = ip->i_nlink;
139 	/*
140 	   Godmar thinks: if dtime is nonzero, ext2 says this inode
141 	   has been deleted, this would correspond to a zero link count
142 	 */
143 	ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
144 	ei->e2di_size = ip->i_size;
145 	if (S_ISREG(ip->i_mode))
146 		ei->e2di_size_high = ip->i_size >> 32;
147 	ei->e2di_atime = ip->i_atime;
148 	ei->e2di_mtime = ip->i_mtime;
149 	ei->e2di_ctime = ip->i_ctime;
150 	if (E2DI_HAS_XTIME(ip)) {
151 		ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
152 		ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
153 		ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
154 		ei->e2di_crtime = ip->i_birthtime;
155 		ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
156 	}
157 	ei->e2di_flags = 0;
158 	ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0;
159 	ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
160 	ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0;
161 	ei->e2di_flags |= (ip->i_flag & IN_E4INDEX) ? EXT4_INDEX: 0;
162 	ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS: 0;
163 	ei->e2di_nblock = ip->i_blocks & 0xffffffff;
164 	ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
165 	ei->e2di_gen = ip->i_gen;
166 	ei->e2di_uid = ip->i_uid;
167 	ei->e2di_gid = ip->i_gid;
168 	/* XXX use memcpy */
169 	for(i = 0; i < NDADDR; i++)
170 		ei->e2di_blocks[i] = ip->i_db[i];
171 	for(i = 0; i < NIADDR; i++)
172 		ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
173 }
174