xref: /freebsd/sys/fs/ext2fs/ext2_inode_cnv.c (revision f0cfa1b168014f56c02b83e5f28412cc5f78d117)
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 #ifdef EXT2FS_DEBUG
45 void
46 ext2_print_inode(struct inode *in)
47 {
48 	int i;
49 	struct ext4_extent_header *ehp;
50 	struct ext4_extent *ep;
51 
52 	printf("Inode: %5ju", (uintmax_t)in->i_number);
53 	printf(	/* "Inode: %5d" */
54 	    " Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d acl: 0x%lx\n",
55 	    "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
56 	printf("User: %5u Group: %5u  Size: %ju\n",
57 	    in->i_uid, in->i_gid, (uintmax_t)in->i_size);
58 	printf("Links: %3d Blockcount: %ju\n",
59 	    in->i_nlink, (uintmax_t)in->i_blocks);
60 	printf("ctime: 0x%x", in->i_ctime);
61 	printf("atime: 0x%x", in->i_atime);
62 	printf("mtime: 0x%x", in->i_mtime);
63 	if (E2DI_HAS_XTIME(in))
64 		printf("crtime %#x ", in->i_birthtime);
65 	if (in->i_flag & IN_E4EXTENTS) {
66 		printf("Extents:\n");
67 		ehp = (struct ext4_extent_header *)in->i_db;
68 		printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
69 		    ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth,
70 		    ehp->eh_gen);
71 		ep = (struct ext4_extent *)(char *)(ehp + 1);
72 		printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk,
73 		    ep->e_len, ep->e_start_lo, ep->e_start_hi);
74 		printf("\n");
75 	} else {
76 		printf("BLOCKS:");
77 		for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
78 			printf("  %d", in->i_db[i]);
79 		printf("\n");
80 	}
81 }
82 #endif	/* EXT2FS_DEBUG */
83 
84 /*
85  *	raw ext2 inode to inode
86  */
87 void
88 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
89 {
90 	ip->i_nlink = ei->e2di_nlink;
91 	/*
92 	 * Godmar thinks - if the link count is zero, then the inode is
93 	 * unused - according to ext2 standards. Ufs marks this fact by
94 	 * setting i_mode to zero - why ? I can see that this might lead to
95 	 * problems in an undelete.
96 	 */
97 	ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
98 	ip->i_size = ei->e2di_size;
99 	if (S_ISREG(ip->i_mode))
100 		ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
101 	ip->i_atime = ei->e2di_atime;
102 	ip->i_mtime = ei->e2di_mtime;
103 	ip->i_ctime = ei->e2di_ctime;
104 	if (E2DI_HAS_XTIME(ip)) {
105 		ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra);
106 		ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra);
107 		ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra);
108 		ip->i_birthtime = ei->e2di_crtime;
109 		ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra);
110 	}
111 	ip->i_flags = 0;
112 	ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
113 	ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
114 	ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
115 	ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0;
116 	ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
117 	ip->i_blocks = ei->e2di_nblock;
118 	ip->i_facl = ei->e2di_facl;
119 	if (E2DI_HAS_HUGE_FILE(ip)) {
120 		ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32;
121 		ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32;
122 		if (ei->e2di_flags & EXT4_HUGE_FILE)
123 			ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
124 	}
125 	ip->i_gen = ei->e2di_gen;
126 	ip->i_uid = ei->e2di_uid;
127 	ip->i_gid = ei->e2di_gid;
128 	ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16;
129 	ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16;
130 
131 	memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks));
132 }
133 
134 /*
135  *	inode to raw ext2 inode
136  */
137 int
138 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
139 {
140 	struct m_ext2fs *fs;
141 
142 	fs = ip->i_e2fs;
143 	ei->e2di_mode = ip->i_mode;
144 	ei->e2di_nlink = ip->i_nlink;
145 	/*
146 	 * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
147 	 * deleted, this would correspond to a zero link count
148 	 */
149 	ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
150 	ei->e2di_size = ip->i_size;
151 	if (S_ISREG(ip->i_mode))
152 		ei->e2di_size_high = ip->i_size >> 32;
153 	ei->e2di_atime = ip->i_atime;
154 	ei->e2di_mtime = ip->i_mtime;
155 	ei->e2di_ctime = ip->i_ctime;
156 	if (E2DI_HAS_XTIME(ip)) {
157 		ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec);
158 		ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec);
159 		ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec);
160 		ei->e2di_crtime = ip->i_birthtime;
161 		ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec);
162 	}
163 	ei->e2di_flags = 0;
164 	ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0;
165 	ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
166 	ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0;
167 	ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0;
168 	ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0;
169 	if (ip->i_blocks > ~0U &&
170 	    !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
171 		ext2_fserr(fs, ip->i_uid, "i_blocks value is out of range");
172 		return (EIO);
173 	}
174 	if (ip->i_blocks <= 0xffffffffffffULL) {
175 		ei->e2di_nblock = ip->i_blocks & 0xffffffff;
176 		ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff;
177 	} else {
178 		ei->e2di_flags |= EXT4_HUGE_FILE;
179 		ei->e2di_nblock = dbtofsb(fs, ip->i_blocks);
180 		ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff;
181 	}
182 	ei->e2di_facl = ip->i_facl & 0xffffffff;
183 	ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff;
184 	ei->e2di_gen = ip->i_gen;
185 	ei->e2di_uid = ip->i_uid & 0xffff;
186 	ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff;
187 	ei->e2di_gid = ip->i_gid & 0xffff;
188 	ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff;
189 
190 	memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks));
191 
192 	return (0);
193 }
194