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15fe4400 KZ |
1 | /* |
2 | * Copyright (C) 1999 by Andries Brouwer | |
3 | * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o | |
4 | * Copyright (C) 2001 by Andreas Dilger | |
5 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> | |
6 | * Copyright (C) 2008 Karel Zak <kzak@redhat.com> | |
0a200255 | 7 | * Copyright (C) 2013 Eric Sandeen <sandeen@redhat.com> |
15fe4400 | 8 | * |
9c863b75 KZ |
9 | * This file may be redistributed under the terms of the |
10 | * GNU Lesser General Public License. | |
15fe4400 KZ |
11 | */ |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <string.h> | |
17 | #include <errno.h> | |
18 | #include <ctype.h> | |
19 | #include <stdint.h> | |
20 | ||
1e3cf6a2 | 21 | #include "superblocks.h" |
15fe4400 KZ |
22 | |
23 | struct xfs_super_block { | |
53e6896a KZ |
24 | uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ |
25 | uint32_t sb_blocksize; /* logical block size, bytes */ | |
26 | uint64_t sb_dblocks; /* number of data blocks */ | |
27 | uint64_t sb_rblocks; /* number of realtime blocks */ | |
28 | uint64_t sb_rextents; /* number of realtime extents */ | |
29 | unsigned char sb_uuid[16]; /* file system unique id */ | |
30 | uint64_t sb_logstart; /* starting block of log if internal */ | |
31 | uint64_t sb_rootino; /* root inode number */ | |
32 | uint64_t sb_rbmino; /* bitmap inode for realtime extents */ | |
33 | uint64_t sb_rsumino; /* summary inode for rt bitmap */ | |
34 | uint32_t sb_rextsize; /* realtime extent size, blocks */ | |
35 | uint32_t sb_agblocks; /* size of an allocation group */ | |
36 | uint32_t sb_agcount; /* number of allocation groups */ | |
37 | uint32_t sb_rbmblocks; /* number of rt bitmap blocks */ | |
38 | uint32_t sb_logblocks; /* number of log blocks */ | |
39 | ||
40 | uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ | |
41 | uint16_t sb_sectsize; /* volume sector size, bytes */ | |
42 | uint16_t sb_inodesize; /* inode size, bytes */ | |
43 | uint16_t sb_inopblock; /* inodes per block */ | |
44 | char sb_fname[12]; /* file system name */ | |
45 | uint8_t sb_blocklog; /* log2 of sb_blocksize */ | |
46 | uint8_t sb_sectlog; /* log2 of sb_sectsize */ | |
47 | uint8_t sb_inodelog; /* log2 of sb_inodesize */ | |
48 | uint8_t sb_inopblog; /* log2 of sb_inopblock */ | |
49 | uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ | |
50 | uint8_t sb_rextslog; /* log2 of sb_rextents */ | |
51 | uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ | |
52 | uint8_t sb_imax_pct; /* max % of fs for inode space */ | |
53 | /* statistics */ | |
54 | uint64_t sb_icount; /* allocated inodes */ | |
55 | uint64_t sb_ifree; /* free inodes */ | |
56 | uint64_t sb_fdblocks; /* free data blocks */ | |
57 | uint64_t sb_frextents; /* free realtime extents */ | |
58 | ||
59 | /* this is not all... but enough for libblkid */ | |
60 | ||
11854e2e | 61 | } __attribute__((packed)); |
15fe4400 | 62 | |
53e6896a KZ |
63 | #define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ |
64 | #define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ | |
65 | #define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) | |
66 | #define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) | |
67 | #define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ | |
68 | #define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ | |
69 | #define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) | |
70 | #define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) | |
71 | ||
72 | #define XFS_DINODE_MIN_LOG 8 | |
73 | #define XFS_DINODE_MAX_LOG 11 | |
74 | #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) | |
75 | #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) | |
76 | ||
77 | #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ | |
78 | #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ | |
79 | #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ | |
80 | ||
81 | #define XFS_MIN_AG_BLOCKS 64 | |
82 | #define XFS_MAX_DBLOCKS(s) ((uint64_t)(s)->sb_agcount * (s)->sb_agblocks) | |
83 | #define XFS_MIN_DBLOCKS(s) ((uint64_t)((s)->sb_agcount - 1) * \ | |
84 | (s)->sb_agblocks + XFS_MIN_AG_BLOCKS) | |
85 | ||
86 | ||
87 | static void sb_from_disk(struct xfs_super_block *from, | |
88 | struct xfs_super_block *to) | |
89 | { | |
90 | ||
91 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
92 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
93 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
94 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
95 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
96 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
97 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
98 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
99 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
100 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
101 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
102 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
103 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
104 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
105 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
106 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
107 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
108 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
109 | to->sb_blocklog = from->sb_blocklog; | |
110 | to->sb_sectlog = from->sb_sectlog; | |
111 | to->sb_inodelog = from->sb_inodelog; | |
112 | to->sb_inopblog = from->sb_inopblog; | |
113 | to->sb_agblklog = from->sb_agblklog; | |
114 | to->sb_rextslog = from->sb_rextslog; | |
115 | to->sb_inprogress = from->sb_inprogress; | |
116 | to->sb_imax_pct = from->sb_imax_pct; | |
117 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
118 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
119 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
120 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
121 | } | |
122 | ||
123 | static int xfs_verify_sb(struct xfs_super_block *ondisk) | |
124 | { | |
125 | struct xfs_super_block sb, *sbp = &sb; | |
126 | ||
127 | /* beXX_to_cpu(), but don't convert UUID and fsname! */ | |
128 | sb_from_disk(ondisk, sbp); | |
129 | ||
130 | /* sanity checks, we don't want to rely on magic string only */ | |
131 | if (sbp->sb_agcount <= 0 || | |
132 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
133 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
134 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
135 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
136 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || | |
137 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
138 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
139 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
140 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
b9710f1f | 141 | sbp->sb_blocksize != (1ULL << sbp->sb_blocklog) || |
53e6896a KZ |
142 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
143 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
144 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || | |
145 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
146 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || | |
147 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
148 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || | |
149 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
150 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || | |
151 | sbp->sb_dblocks == 0 || | |
152 | sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || | |
153 | sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp)) | |
154 | return 0; | |
155 | ||
156 | /* TODO: version 5 has also checksum CRC32, maybe we can check it too */ | |
157 | ||
158 | return 1; | |
159 | } | |
160 | ||
15fe4400 KZ |
161 | static int probe_xfs(blkid_probe pr, const struct blkid_idmag *mag) |
162 | { | |
163 | struct xfs_super_block *xs; | |
164 | ||
165 | xs = blkid_probe_get_sb(pr, mag, struct xfs_super_block); | |
166 | if (!xs) | |
37f40602 | 167 | return errno ? -errno : 1; |
15fe4400 | 168 | |
53e6896a KZ |
169 | if (!xfs_verify_sb(xs)) |
170 | return 1; | |
171 | ||
e8c20678 | 172 | if (*xs->sb_fname != '\0') |
53e6896a KZ |
173 | blkid_probe_set_label(pr, (unsigned char *) xs->sb_fname, |
174 | sizeof(xs->sb_fname)); | |
175 | blkid_probe_set_uuid(pr, xs->sb_uuid); | |
2771d40b | 176 | blkid_probe_set_block_size(pr, be16_to_cpu(xs->sb_sectsize)); |
15fe4400 KZ |
177 | return 0; |
178 | } | |
179 | ||
180 | const struct blkid_idinfo xfs_idinfo = | |
181 | { | |
182 | .name = "xfs", | |
183 | .usage = BLKID_USAGE_FILESYSTEM, | |
184 | .probefunc = probe_xfs, | |
185 | .magics = | |
186 | { | |
187 | { .magic = "XFSB", .len = 4 }, | |
188 | { NULL } | |
189 | } | |
190 | }; | |
191 | ||
0a200255 ES |
192 | struct xlog_rec_header { |
193 | uint32_t h_magicno; | |
194 | uint32_t h_dummy1[1]; | |
195 | uint32_t h_version; | |
196 | uint32_t h_len; | |
197 | uint32_t h_dummy2[71]; | |
198 | uint32_t h_fmt; | |
199 | unsigned char h_uuid[16]; | |
200 | } __attribute__((packed)); | |
201 | ||
202 | #define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe | |
203 | ||
204 | /* | |
205 | * For very small filesystems, the minimum log size | |
206 | * can be smaller, but that seems vanishingly unlikely | |
207 | * when used with an external log (which is used for | |
208 | * performance reasons; tiny conflicts with that goal). | |
209 | */ | |
210 | #define XFS_MIN_LOG_BYTES (10 * 1024 * 1024) | |
211 | ||
212 | #define XLOG_FMT_LINUX_LE 1 | |
213 | #define XLOG_FMT_LINUX_BE 2 | |
214 | #define XLOG_FMT_IRIX_BE 3 | |
215 | ||
216 | #define XLOG_VERSION_1 1 | |
217 | #define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */ | |
218 | #define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2) | |
219 | ||
220 | static int xlog_valid_rec_header(struct xlog_rec_header *rhead) | |
221 | { | |
3b411763 | 222 | uint32_t hlen; |
0a200255 ES |
223 | |
224 | if (rhead->h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) | |
225 | return 0; | |
226 | ||
227 | if (!rhead->h_version || | |
228 | (be32_to_cpu(rhead->h_version) & (~XLOG_VERSION_OKBITS))) | |
229 | return 0; | |
230 | ||
231 | /* LR body must have data or it wouldn't have been written */ | |
232 | hlen = be32_to_cpu(rhead->h_len); | |
233 | if (hlen <= 0 || hlen > INT_MAX) | |
234 | return 0; | |
235 | ||
236 | if (rhead->h_fmt != cpu_to_be32(XLOG_FMT_LINUX_LE) && | |
237 | rhead->h_fmt != cpu_to_be32(XLOG_FMT_LINUX_BE) && | |
238 | rhead->h_fmt != cpu_to_be32(XLOG_FMT_IRIX_BE)) | |
239 | return 0; | |
240 | ||
241 | return 1; | |
242 | } | |
243 | ||
244 | /* xlog record header will be in some sector in the first 256k */ | |
71177ab8 RM |
245 | static int probe_xfs_log(blkid_probe pr, |
246 | const struct blkid_idmag *mag __attribute__((__unused__))) | |
0a200255 ES |
247 | { |
248 | int i; | |
249 | struct xlog_rec_header *rhead; | |
250 | unsigned char *buf; | |
251 | ||
252 | buf = blkid_probe_get_buffer(pr, 0, 256*1024); | |
253 | if (!buf) | |
37f40602 | 254 | return errno ? -errno : 1; |
0a200255 | 255 | |
ed5a064d KZ |
256 | if (memcmp(buf, "XFSB", 4) == 0) |
257 | return 1; /* this is regular XFS, ignore */ | |
258 | ||
0a200255 ES |
259 | /* check the first 512 512-byte sectors */ |
260 | for (i = 0; i < 512; i++) { | |
261 | rhead = (struct xlog_rec_header *)&buf[i*512]; | |
262 | ||
263 | if (xlog_valid_rec_header(rhead)) { | |
c57e6f52 | 264 | blkid_probe_set_uuid_as(pr, rhead->h_uuid, "LOGUUID"); |
d5b7d291 KZ |
265 | |
266 | if (blkid_probe_set_magic(pr, i * 512, | |
267 | sizeof(rhead->h_magicno), | |
268 | (unsigned char *) &rhead->h_magicno)) | |
269 | return 1; | |
270 | ||
0a200255 ES |
271 | return 0; |
272 | } | |
273 | } | |
274 | ||
37f40602 | 275 | return 1; |
0a200255 ES |
276 | } |
277 | ||
278 | const struct blkid_idinfo xfs_log_idinfo = | |
279 | { | |
280 | .name = "xfs_external_log", | |
281 | .usage = BLKID_USAGE_OTHER, | |
282 | .probefunc = probe_xfs_log, | |
283 | .magics = BLKID_NONE_MAGIC, | |
284 | .minsz = XFS_MIN_LOG_BYTES, | |
285 | }; |