1 /*-
2 * SPDX-License-Identifier: MIT-CMU
3 *
4 * Copyright (c) 1995 The University of Utah and
5 * the Computer Systems Laboratory at the University of Utah (CSL).
6 * All rights reserved.
7 *
8 * Permission to use, copy, modify and distribute this software is hereby
9 * granted provided that (1) source code retains these copyright, permission,
10 * and disclaimer notices, and (2) redistributions including binaries
11 * reproduce the notices in supporting documentation, and (3) all advertising
12 * materials mentioning features or use of this software display the following
13 * acknowledgement: ``This product includes software developed by the
14 * Computer Systems Laboratory at the University of Utah.''
15 *
16 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
17 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
18 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
21 * improvements that they make and grant CSL redistribution rights.
22 *
23 * Utah $Hdr$
24 * $FreeBSD$
25 */
26
27 /*
28 * routines to convert on disk ext2 inodes into inodes and back
29 */
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/endian.h>
33 #include <sys/lock.h>
34 #include <sys/sdt.h>
35 #include <sys/stat.h>
36 #include <sys/vnode.h>
37
38 #include <fs/ext2fs/fs.h>
39 #include <fs/ext2fs/inode.h>
40 #include <fs/ext2fs/ext2fs.h>
41 #include <fs/ext2fs/ext2_dinode.h>
42 #include <fs/ext2fs/ext2_extern.h>
43
44 SDT_PROVIDER_DECLARE(ext2fs);
45 /*
46 * ext2fs trace probe:
47 * arg0: verbosity. Higher numbers give more verbose messages
48 * arg1: Textual message
49 */
50 SDT_PROBE_DEFINE2(ext2fs, , trace, inode_cnv, "int", "char*");
51
52 #ifdef EXT2FS_PRINT_EXTENTS
53 void
54 ext2_print_inode(struct inode *in)
55 {
56 int i;
57 struct ext4_extent_header *ehp;
58 struct ext4_extent *ep;
59
60 printf("Inode: %5ju", (uintmax_t)in->i_number);
61 printf( /* "Inode: %5d" */
62 " Type: %10s Mode: 0x%o Flags: 0x%x Version: %d acl: 0x%jx\n",
63 "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl);
64 printf("User: %5u Group: %5u Size: %ju\n",
65 in->i_uid, in->i_gid, (uintmax_t)in->i_size);
66 printf("Links: %3d Blockcount: %ju\n",
67 in->i_nlink, (uintmax_t)in->i_blocks);
68 printf("ctime: 0x%llx ", (unsigned long long)in->i_ctime);
69 printf("atime: 0x%llx ", (unsigned long long)in->i_atime);
70 printf("mtime: 0x%llx ", (unsigned long long)in->i_mtime);
71 if (E2DI_HAS_XTIME(in))
72 printf("crtime %llx\n", (unsigned long long)in->i_birthtime);
73 else
74 printf("\n");
75 if (in->i_flag & IN_E4EXTENTS) {
76 printf("Extents:\n");
77 ehp = (struct ext4_extent_header *)in->i_db;
78 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n",
79 le16toh(ehp->eh_magic), le16toh(ehp->eh_ecount),
80 le16toh(ehp->eh_max), le16toh(ehp->eh_depth),
81 le32toh(ehp->eh_gen));
82 ep = (struct ext4_extent *)(char *)(ehp + 1);
83 printf("Index (blk %d len %d start_lo %d start_hi %d)\n",
84 le32toh(ep->e_blk),
85 le16toh(ep->e_len), le32toh(ep->e_start_lo),
86 le16toh(ep->e_start_hi));
87 printf("\n");
88 } else {
89 printf("Blocks:");
90 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++)
91 printf(" %d", in->i_db[i]);
92 printf("\n");
93 }
94 }
95 #endif /* EXT2FS_PRINT_EXTENTS */
96
97 static inline bool
98 ext2_old_valid_dev(dev_t dev)
99 {
100 return (major(dev) < 256 && minor(dev) < 256);
101 }
102
103 static inline uint16_t
104 ext2_old_encode_dev(dev_t dev)
105 {
106 return ((major(dev) << 8) | minor(dev));
107 }
108
109 static inline dev_t
110 ext2_old_decode_dev(uint16_t val)
111 {
112 return (makedev((val >> 8) & 255, val & 255));
113 }
114
115 static inline uint32_t
116 ext2_new_encode_dev(dev_t dev)
117 {
118 unsigned maj = major(dev);
119 unsigned min = minor(dev);
120
121 return ((min & 0xff) | (maj << 8) | ((min & ~0xff) << 12));
122 }
123
124 static inline dev_t
125 ext2_new_decode_dev(uint32_t dev)
126 {
127 unsigned maj = (dev & 0xfff00) >> 8;
128 unsigned min = (dev & 0xff) | ((dev >> 12) & 0xfff00);
129
130 return (makedev(maj, min));
131 }
132
133 static inline void
134 ext2_decode_extra_time(ext_time_t *sec, int32_t *nsec, uint32_t extra)
135 {
136 if (extra & htole32(EXT3_EPOCH_MASK))
137 *sec += (uint64_t)(le32toh(extra) & EXT3_EPOCH_MASK) << 32;
138
139 *nsec = (le32toh(extra) & EXT3_NSEC_MASK) >> EXT3_EPOCH_BITS;
140 }
141
142 /*
143 * raw ext2 inode LE to host inode conversion
144 */
145 int
146 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip)
147 {
148 struct m_ext2fs *fs = ip->i_e2fs;
149 uint32_t ei_flags_host;
150 uint16_t ei_extra_isize_le;
151 int i;
152
153 if ((ip->i_number < EXT2_FIRST_INO(fs) && ip->i_number != EXT2_ROOTINO) ||
154 (ip->i_number < EXT2_ROOTINO) ||
155 (ip->i_number > le32toh(fs->e2fs->e2fs_icount))) {
156 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "bad inode number");
157 return (EINVAL);
158 }
159
160 /*
161 * Godmar thinks - if the link count is zero, then the inode is
162 * unused - according to ext2 standards. Ufs marks this fact by
163 * setting i_mode to zero - why ? I can see that this might lead to
164 * problems in an undelete.
165 */
166 ip->i_nlink = le16toh(ei->e2di_nlink);
167 ip->i_mode = ip->i_nlink ? le16toh(ei->e2di_mode) : 0;
168 if (ip->i_number == EXT2_ROOTINO &&
169 (ip->i_nlink < 2 || !S_ISDIR(ip->i_mode))) {
170 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "root inode invalid");
171 return (EINVAL);
172 }
173
174 /* Check extra inode size */
175 ei_extra_isize_le = le16toh(ei->e2di_extra_isize);
176 if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) {
177 if (E2FS_REV0_INODE_SIZE + ei_extra_isize_le >
178 EXT2_INODE_SIZE(fs) || (ei_extra_isize_le & 3)) {
179 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1,
180 "bad extra inode size");
181 return (EINVAL);
182 }
183 }
184
185 ip->i_size = le32toh(ei->e2di_size);
186 if (S_ISREG(ip->i_mode))
187 ip->i_size |= (uint64_t)le32toh(ei->e2di_size_high) << 32;
188 ip->i_atime = (signed)le32toh(ei->e2di_atime);
189 ip->i_mtime = (signed)le32toh(ei->e2di_mtime);
190 ip->i_ctime = (signed)le32toh(ei->e2di_ctime);
191 if (E2DI_HAS_XTIME(ip)) {
192 ext2_decode_extra_time(&ip->i_atime, &ip->i_atimensec,
193 ei->e2di_atime_extra);
194 ext2_decode_extra_time(&ip->i_mtime, &ip->i_mtimensec,
195 ei->e2di_mtime_extra);
196 ext2_decode_extra_time(&ip->i_ctime, &ip->i_ctimensec,
197 ei->e2di_ctime_extra);
198 ip->i_birthtime = (signed)le32toh(ei->e2di_crtime);
199 ext2_decode_extra_time(&ip->i_birthtime, &ip->i_birthnsec,
200 ei->e2di_crtime_extra);
201 }
202 ip->i_flags = 0;
203 ei_flags_host = le32toh(ei->e2di_flags);
204 ip->i_flags |= (ei_flags_host & EXT2_APPEND) ? SF_APPEND : 0;
205 ip->i_flags |= (ei_flags_host & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
206 ip->i_flags |= (ei_flags_host & EXT2_NODUMP) ? UF_NODUMP : 0;
207 ip->i_flag |= (ei_flags_host & EXT3_INDEX) ? IN_E3INDEX : 0;
208 ip->i_flag |= (ei_flags_host & EXT4_EXTENTS) ? IN_E4EXTENTS : 0;
209 ip->i_blocks = le32toh(ei->e2di_nblock);
210 ip->i_facl = le32toh(ei->e2di_facl);
211 if (E2DI_HAS_HUGE_FILE(ip)) {
212 ip->i_blocks |= (uint64_t)le16toh(ei->e2di_nblock_high) << 32;
213 ip->i_facl |= (uint64_t)le16toh(ei->e2di_facl_high) << 32;
214 if (ei_flags_host & EXT4_HUGE_FILE)
215 ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks);
216 }
217 ip->i_gen = le32toh(ei->e2di_gen);
218 ip->i_uid = le16toh(ei->e2di_uid);
219 ip->i_gid = le16toh(ei->e2di_gid);
220 ip->i_uid |= (uint32_t)le16toh(ei->e2di_uid_high) << 16;
221 ip->i_gid |= (uint32_t)le16toh(ei->e2di_gid_high) << 16;
222
223 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
224 if (ei->e2di_blocks[0])
225 ip->i_rdev = ext2_old_decode_dev(le32toh(ei->e2di_blocks[0]));
226 else
227 ip->i_rdev = ext2_new_decode_dev(le32toh(ei->e2di_blocks[1]));
228 } else if ((ip->i_flag & IN_E4EXTENTS)) {
229 memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks));
230 } else {
231 for (i = 0; i < EXT2_NDADDR; i++)
232 ip->i_db[i] = le32toh(ei->e2di_blocks[i]);
233 for (i = 0; i < EXT2_NIADDR; i++)
234 ip->i_ib[i] = le32toh(ei->e2di_blocks[EXT2_NDIR_BLOCKS + i]);
235 }
236
237 /* Verify inode csum. */
238 return (ext2_ei_csum_verify(ip, ei));
239 }
240
241 static inline uint32_t
242 ext2_encode_extra_time(int64_t sec, int32_t nsec)
243 {
244 uint32_t extra;
245
246 extra = ((sec - (int32_t)sec) >> 32) & EXT3_EPOCH_MASK;
247
248 return (htole32(extra | (nsec << EXT3_EPOCH_BITS)));
249 }
250
251 /*
252 * inode to raw ext2 LE inode conversion
253 */
254 int
255 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei)
256 {
257 struct m_ext2fs *fs;
258 int i;
259
260 fs = ip->i_e2fs;
261 ei->e2di_mode = htole16(ip->i_mode);
262 ei->e2di_nlink = htole16(ip->i_nlink);
263 ei->e2di_size = htole32(ip->i_size);
264 if (S_ISREG(ip->i_mode))
265 ei->e2di_size_high = htole32(ip->i_size >> 32);
266 ei->e2di_atime = htole32(ip->i_atime);
267 ei->e2di_mtime = htole32(ip->i_mtime);
268 ei->e2di_ctime = htole32(ip->i_ctime);
269 /*
270 * Godmar thinks: if dtime is nonzero, ext2 says this inode has been
271 * deleted, this would correspond to a zero link count
272 */
273 ei->e2di_dtime = htole32(le16toh(ei->e2di_nlink) ? 0 :
274 le32toh(ei->e2di_mtime));
275 if (E2DI_HAS_XTIME(ip)) {
276 ei->e2di_ctime_extra = ext2_encode_extra_time(ip->i_ctime,
277 ip->i_ctimensec);
278 ei->e2di_mtime_extra = ext2_encode_extra_time(ip->i_mtime,
279 ip->i_mtimensec);
280 ei->e2di_atime_extra = ext2_encode_extra_time(ip->i_atime,
281 ip->i_atimensec);
282 ei->e2di_crtime = htole32(ip->i_birthtime);
283 ei->e2di_crtime_extra = ext2_encode_extra_time(ip->i_birthtime,
284 ip->i_birthnsec);
285 }
286 /* Keep these in host endian for a while since they change a lot */
287 ei->e2di_flags = 0;
288 ei->e2di_flags |= htole32((ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0);
289 ei->e2di_flags |= htole32((ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0);
290 ei->e2di_flags |= htole32((ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0);
291 ei->e2di_flags |= htole32((ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0);
292 ei->e2di_flags |= htole32((ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0);
293 if (ip->i_blocks > ~0U &&
294 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) {
295 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "i_blocks value is out of range");
296 return (EIO);
297 }
298 if (ip->i_blocks <= 0xffffffffffffULL) {
299 ei->e2di_nblock = htole32(ip->i_blocks & 0xffffffff);
300 ei->e2di_nblock_high = htole16(ip->i_blocks >> 32 & 0xffff);
301 } else {
302 ei->e2di_flags |= htole32(EXT4_HUGE_FILE);
303 ei->e2di_nblock = htole32(dbtofsb(fs, ip->i_blocks));
304 ei->e2di_nblock_high = htole16(dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff);
305 }
306
307 ei->e2di_facl = htole32(ip->i_facl & 0xffffffff);
308 ei->e2di_facl_high = htole16(ip->i_facl >> 32 & 0xffff);
309 ei->e2di_gen = htole32(ip->i_gen);
310 ei->e2di_uid = htole16(ip->i_uid & 0xffff);
311 ei->e2di_uid_high = htole16(ip->i_uid >> 16 & 0xffff);
312 ei->e2di_gid = htole16(ip->i_gid & 0xffff);
313 ei->e2di_gid_high = htole16(ip->i_gid >> 16 & 0xffff);
314
315 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
316 if (ext2_old_valid_dev(ip->i_rdev)) {
317 ei->e2di_blocks[0] = htole32(ext2_old_encode_dev(ip->i_rdev));
318 ei->e2di_blocks[1] = 0;
319 } else {
320 ei->e2di_blocks[0] = 0;
321 ei->e2di_blocks[1] = htole32(ext2_new_encode_dev(ip->i_rdev));
322 ei->e2di_blocks[2] = 0;
323 }
324 } else if ((ip->i_flag & IN_E4EXTENTS)) {
325 memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks));
326 } else {
327 for (i = 0; i < EXT2_NDADDR; i++)
328 ei->e2di_blocks[i] = htole32(ip->i_db[i]);
329 for (i = 0; i < EXT2_NIADDR; i++)
330 ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = htole32(ip->i_ib[i]);
331 }
332
333 /* Set inode csum. */
334 ext2_ei_csum_set(ip, ei);
335
336 return (0);
337 }
Cache object: c3767c3df837e254dd142c670de4775c
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