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1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
12 | * the GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | |
19 | /* |
20 | * Module: jfs_mount.c |
21 | * |
22 | * note: file system in transition to aggregate/fileset: |
23 | * |
24 | * file system mount is interpreted as the mount of aggregate, |
25 | * if not already mounted, and mount of the single/only fileset in |
26 | * the aggregate; |
27 | * |
28 | * a file system/aggregate is represented by an internal inode |
29 | * (aka mount inode) initialized with aggregate superblock; |
30 | * each vfs represents a fileset, and points to its "fileset inode |
31 | * allocation map inode" (aka fileset inode): |
32 | * (an aggregate itself is structured recursively as a filset: |
33 | * an internal vfs is constructed and points to its "fileset inode |
34 | * allocation map inode" (aka aggregate inode) where each inode |
35 | * represents a fileset inode) so that inode number is mapped to |
36 | * on-disk inode in uniform way at both aggregate and fileset level; |
37 | * |
38 | * each vnode/inode of a fileset is linked to its vfs (to facilitate |
39 | * per fileset inode operations, e.g., unmount of a fileset, etc.); |
40 | * each inode points to the mount inode (to facilitate access to |
41 | * per aggregate information, e.g., block size, etc.) as well as |
42 | * its file set inode. |
43 | * |
44 | * aggregate |
45 | * ipmnt |
46 | * mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap; |
47 | * fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot; |
48 | */ |
49 | |
50 | #include <linux/fs.h> |
51 | #include <linux/buffer_head.h> |
52 | |
53 | #include "jfs_incore.h" |
54 | #include "jfs_filsys.h" |
55 | #include "jfs_superblock.h" |
56 | #include "jfs_dmap.h" |
57 | #include "jfs_imap.h" |
58 | #include "jfs_metapage.h" |
59 | #include "jfs_debug.h" |
60 | |
61 | |
62 | /* |
63 | * forward references |
64 | */ |
65 | static int chkSuper(struct super_block *); |
66 | static int logMOUNT(struct super_block *sb); |
67 | |
68 | /* |
69 | * NAME: jfs_mount(sb) |
70 | * |
71 | * FUNCTION: vfs_mount() |
72 | * |
73 | * PARAMETER: sb - super block |
74 | * |
75 | * RETURN: -EBUSY - device already mounted or open for write |
76 | * -EBUSY - cvrdvp already mounted; |
77 | * -EBUSY - mount table full |
78 | * -ENOTDIR- cvrdvp not directory on a device mount |
79 | * -ENXIO - device open failure |
80 | */ |
81 | int jfs_mount(struct super_block *sb) |
82 | { |
83 | int rc = 0; /* Return code */ |
84 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
85 | struct inode *ipaimap = NULL; |
86 | struct inode *ipaimap2 = NULL; |
87 | struct inode *ipimap = NULL; |
88 | struct inode *ipbmap = NULL; |
89 | |
90 | /* |
91 | * read/validate superblock |
92 | * (initialize mount inode from the superblock) |
93 | */ |
94 | if ((rc = chkSuper(sb))) { |
95 | goto errout20; |
96 | } |
97 | |
98 | ipaimap = diReadSpecial(sb, AGGREGATE_I, 0); |
99 | if (ipaimap == NULL) { |
100 | jfs_err("jfs_mount: Failed to read AGGREGATE_I"); |
101 | rc = -EIO; |
102 | goto errout20; |
103 | } |
104 | sbi->ipaimap = ipaimap; |
105 | |
106 | jfs_info("jfs_mount: ipaimap:0x%p", ipaimap); |
107 | |
108 | /* |
109 | * initialize aggregate inode allocation map |
110 | */ |
111 | if ((rc = diMount(ipaimap))) { |
112 | jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc); |
113 | goto errout21; |
114 | } |
115 | |
116 | /* |
117 | * open aggregate block allocation map |
118 | */ |
119 | ipbmap = diReadSpecial(sb, BMAP_I, 0); |
120 | if (ipbmap == NULL) { |
121 | rc = -EIO; |
122 | goto errout22; |
123 | } |
124 | |
125 | jfs_info("jfs_mount: ipbmap:0x%p", ipbmap); |
126 | |
127 | sbi->ipbmap = ipbmap; |
128 | |
129 | /* |
130 | * initialize aggregate block allocation map |
131 | */ |
132 | if ((rc = dbMount(ipbmap))) { |
133 | jfs_err("jfs_mount: dbMount failed w/rc = %d", rc); |
134 | goto errout22; |
135 | } |
136 | |
137 | /* |
138 | * open the secondary aggregate inode allocation map |
139 | * |
140 | * This is a duplicate of the aggregate inode allocation map. |
141 | * |
142 | * hand craft a vfs in the same fashion as we did to read ipaimap. |
143 | * By adding INOSPEREXT (32) to the inode number, we are telling |
144 | * diReadSpecial that we are reading from the secondary aggregate |
145 | * inode table. This also creates a unique entry in the inode hash |
146 | * table. |
147 | */ |
148 | if ((sbi->mntflag & JFS_BAD_SAIT) == 0) { |
149 | ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1); |
150 | if (!ipaimap2) { |
151 | jfs_err("jfs_mount: Failed to read AGGREGATE_I"); |
152 | rc = -EIO; |
153 | goto errout35; |
154 | } |
155 | sbi->ipaimap2 = ipaimap2; |
156 | |
157 | jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2); |
158 | |
159 | /* |
160 | * initialize secondary aggregate inode allocation map |
161 | */ |
162 | if ((rc = diMount(ipaimap2))) { |
163 | jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d", |
164 | rc); |
165 | goto errout35; |
166 | } |
167 | } else |
168 | /* Secondary aggregate inode table is not valid */ |
169 | sbi->ipaimap2 = NULL; |
170 | |
171 | /* |
172 | * mount (the only/single) fileset |
173 | */ |
174 | /* |
175 | * open fileset inode allocation map (aka fileset inode) |
176 | */ |
177 | ipimap = diReadSpecial(sb, FILESYSTEM_I, 0); |
178 | if (ipimap == NULL) { |
179 | jfs_err("jfs_mount: Failed to read FILESYSTEM_I"); |
180 | /* open fileset secondary inode allocation map */ |
181 | rc = -EIO; |
182 | goto errout40; |
183 | } |
184 | jfs_info("jfs_mount: ipimap:0x%p", ipimap); |
185 | |
186 | /* map further access of per fileset inodes by the fileset inode */ |
187 | sbi->ipimap = ipimap; |
188 | |
189 | /* initialize fileset inode allocation map */ |
190 | if ((rc = diMount(ipimap))) { |
191 | jfs_err("jfs_mount: diMount failed w/rc = %d", rc); |
192 | goto errout41; |
193 | } |
194 | |
195 | goto out; |
196 | |
197 | /* |
198 | * unwind on error |
199 | */ |
200 | errout41: /* close fileset inode allocation map inode */ |
201 | diFreeSpecial(ipimap); |
202 | |
203 | errout40: /* fileset closed */ |
204 | |
205 | /* close secondary aggregate inode allocation map */ |
206 | if (ipaimap2) { |
207 | diUnmount(ipaimap2, 1); |
208 | diFreeSpecial(ipaimap2); |
209 | } |
210 | |
211 | errout35: |
212 | |
213 | /* close aggregate block allocation map */ |
214 | dbUnmount(ipbmap, 1); |
215 | diFreeSpecial(ipbmap); |
216 | |
217 | errout22: /* close aggregate inode allocation map */ |
218 | |
219 | diUnmount(ipaimap, 1); |
220 | |
221 | errout21: /* close aggregate inodes */ |
222 | diFreeSpecial(ipaimap); |
223 | errout20: /* aggregate closed */ |
224 | |
225 | out: |
226 | |
227 | if (rc) |
228 | jfs_err("Mount JFS Failure: %d", rc); |
229 | |
230 | return rc; |
231 | } |
232 | |
233 | /* |
234 | * NAME: jfs_mount_rw(sb, remount) |
235 | * |
236 | * FUNCTION: Completes read-write mount, or remounts read-only volume |
237 | * as read-write |
238 | */ |
239 | int jfs_mount_rw(struct super_block *sb, int remount) |
240 | { |
241 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
242 | int rc; |
243 | |
244 | /* |
245 | * If we are re-mounting a previously read-only volume, we want to |
246 | * re-read the inode and block maps, since fsck.jfs may have updated |
247 | * them. |
248 | */ |
249 | if (remount) { |
250 | if (chkSuper(sb) || (sbi->state != FM_CLEAN)) |
251 | return -EINVAL; |
252 | |
253 | truncate_inode_pages(sbi->ipimap->i_mapping, 0); |
254 | truncate_inode_pages(sbi->ipbmap->i_mapping, 0); |
255 | diUnmount(sbi->ipimap, 1); |
256 | if ((rc = diMount(sbi->ipimap))) { |
257 | jfs_err("jfs_mount_rw: diMount failed!"); |
258 | return rc; |
259 | } |
260 | |
261 | dbUnmount(sbi->ipbmap, 1); |
262 | if ((rc = dbMount(sbi->ipbmap))) { |
263 | jfs_err("jfs_mount_rw: dbMount failed!"); |
264 | return rc; |
265 | } |
266 | } |
267 | |
268 | /* |
269 | * open/initialize log |
270 | */ |
271 | if ((rc = lmLogOpen(sb))) |
272 | return rc; |
273 | |
274 | /* |
275 | * update file system superblock; |
276 | */ |
277 | if ((rc = updateSuper(sb, FM_MOUNT))) { |
278 | jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc); |
279 | lmLogClose(sb); |
280 | return rc; |
281 | } |
282 | |
283 | /* |
284 | * write MOUNT log record of the file system |
285 | */ |
286 | logMOUNT(sb); |
287 | |
288 | return rc; |
289 | } |
290 | |
291 | /* |
292 | * chkSuper() |
293 | * |
294 | * validate the superblock of the file system to be mounted and |
295 | * get the file system parameters. |
296 | * |
297 | * returns |
298 | * 0 with fragsize set if check successful |
299 | * error code if not successful |
300 | */ |
301 | static int chkSuper(struct super_block *sb) |
302 | { |
303 | int rc = 0; |
304 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
305 | struct jfs_superblock *j_sb; |
306 | struct buffer_head *bh; |
307 | int AIM_bytesize, AIT_bytesize; |
308 | int expected_AIM_bytesize, expected_AIT_bytesize; |
309 | s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr; |
310 | s64 byte_addr_diff0, byte_addr_diff1; |
311 | s32 bsize; |
312 | |
313 | if ((rc = readSuper(sb, &bh))) |
314 | return rc; |
315 | j_sb = (struct jfs_superblock *)bh->b_data; |
316 | |
317 | /* |
318 | * validate superblock |
319 | */ |
320 | /* validate fs signature */ |
321 | if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) || |
322 | le32_to_cpu(j_sb->s_version) > JFS_VERSION) { |
323 | rc = -EINVAL; |
324 | goto out; |
325 | } |
326 | |
327 | bsize = le32_to_cpu(j_sb->s_bsize); |
328 | #ifdef _JFS_4K |
329 | if (bsize != PSIZE) { |
330 | jfs_err("Currently only 4K block size supported!"); |
331 | rc = -EINVAL; |
332 | goto out; |
333 | } |
334 | #endif /* _JFS_4K */ |
335 | |
336 | jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx", |
337 | le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state), |
338 | (unsigned long long) le64_to_cpu(j_sb->s_size)); |
339 | |
340 | /* validate the descriptors for Secondary AIM and AIT */ |
341 | if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) != |
342 | cpu_to_le32(JFS_BAD_SAIT)) { |
343 | expected_AIM_bytesize = 2 * PSIZE; |
344 | AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize; |
345 | expected_AIT_bytesize = 4 * PSIZE; |
346 | AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize; |
347 | AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize; |
348 | AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize; |
349 | byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr; |
350 | fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize; |
351 | byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr; |
352 | if ((AIM_bytesize != expected_AIM_bytesize) || |
353 | (AIT_bytesize != expected_AIT_bytesize) || |
354 | (byte_addr_diff0 != AIM_bytesize) || |
355 | (byte_addr_diff1 <= AIT_bytesize)) |
356 | j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); |
357 | } |
358 | |
359 | if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) != |
360 | cpu_to_le32(JFS_GROUPCOMMIT)) |
361 | j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT); |
362 | |
363 | /* validate fs state */ |
364 | if (j_sb->s_state != cpu_to_le32(FM_CLEAN) && |
365 | !(sb->s_flags & MS_RDONLY)) { |
366 | jfs_err("jfs_mount: Mount Failure: File System Dirty."); |
367 | rc = -EINVAL; |
368 | goto out; |
369 | } |
370 | |
371 | sbi->state = le32_to_cpu(j_sb->s_state); |
372 | sbi->mntflag = le32_to_cpu(j_sb->s_flag); |
373 | |
374 | /* |
375 | * JFS always does I/O by 4K pages. Don't tell the buffer cache |
376 | * that we use anything else (leave s_blocksize alone). |
377 | */ |
378 | sbi->bsize = bsize; |
379 | sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize); |
380 | |
381 | /* |
382 | * For now, ignore s_pbsize, l2bfactor. All I/O going through buffer |
383 | * cache. |
384 | */ |
385 | sbi->nbperpage = PSIZE >> sbi->l2bsize; |
386 | sbi->l2nbperpage = L2PSIZE - sbi->l2bsize; |
387 | sbi->l2niperblk = sbi->l2bsize - L2DISIZE; |
388 | if (sbi->mntflag & JFS_INLINELOG) |
389 | sbi->logpxd = j_sb->s_logpxd; |
390 | else { |
391 | sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev)); |
392 | memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid)); |
393 | memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid)); |
394 | } |
395 | sbi->fsckpxd = j_sb->s_fsckpxd; |
396 | sbi->ait2 = j_sb->s_ait2; |
397 | |
398 | out: |
399 | brelse(bh); |
400 | return rc; |
401 | } |
402 | |
403 | |
404 | /* |
405 | * updateSuper() |
406 | * |
407 | * update synchronously superblock if it is mounted read-write. |
408 | */ |
409 | int updateSuper(struct super_block *sb, uint state) |
410 | { |
411 | struct jfs_superblock *j_sb; |
412 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
413 | struct buffer_head *bh; |
414 | int rc; |
415 | |
416 | if (sbi->flag & JFS_NOINTEGRITY) { |
417 | if (state == FM_DIRTY) { |
418 | sbi->p_state = state; |
419 | return 0; |
420 | } else if (state == FM_MOUNT) { |
421 | sbi->p_state = sbi->state; |
422 | state = FM_DIRTY; |
423 | } else if (state == FM_CLEAN) { |
424 | state = sbi->p_state; |
425 | } else |
426 | jfs_err("updateSuper: bad state"); |
427 | } else if (sbi->state == FM_DIRTY) |
428 | return 0; |
429 | |
430 | if ((rc = readSuper(sb, &bh))) |
431 | return rc; |
432 | |
433 | j_sb = (struct jfs_superblock *)bh->b_data; |
434 | |
435 | j_sb->s_state = cpu_to_le32(state); |
436 | sbi->state = state; |
437 | |
438 | if (state == FM_MOUNT) { |
439 | /* record log's dev_t and mount serial number */ |
440 | j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev)); |
441 | j_sb->s_logserial = cpu_to_le32(sbi->log->serial); |
442 | } else if (state == FM_CLEAN) { |
443 | /* |
444 | * If this volume is shared with OS/2, OS/2 will need to |
445 | * recalculate DASD usage, since we don't deal with it. |
446 | */ |
447 | if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED)) |
448 | j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME); |
449 | } |
450 | |
451 | mark_buffer_dirty(bh); |
452 | sync_dirty_buffer(bh); |
453 | brelse(bh); |
454 | |
455 | return 0; |
456 | } |
457 | |
458 | |
459 | /* |
460 | * readSuper() |
461 | * |
462 | * read superblock by raw sector address |
463 | */ |
464 | int readSuper(struct super_block *sb, struct buffer_head **bpp) |
465 | { |
466 | /* read in primary superblock */ |
467 | *bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits); |
468 | if (*bpp) |
469 | return 0; |
470 | |
471 | /* read in secondary/replicated superblock */ |
472 | *bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits); |
473 | if (*bpp) |
474 | return 0; |
475 | |
476 | return -EIO; |
477 | } |
478 | |
479 | |
480 | /* |
481 | * logMOUNT() |
482 | * |
483 | * function: write a MOUNT log record for file system. |
484 | * |
485 | * MOUNT record keeps logredo() from processing log records |
486 | * for this file system past this point in log. |
487 | * it is harmless if mount fails. |
488 | * |
489 | * note: MOUNT record is at aggregate level, not at fileset level, |
490 | * since log records of previous mounts of a fileset |
491 | * (e.g., AFTER record of extent allocation) have to be processed |
492 | * to update block allocation map at aggregate level. |
493 | */ |
494 | static int logMOUNT(struct super_block *sb) |
495 | { |
496 | struct jfs_log *log = JFS_SBI(sb)->log; |
497 | struct lrd lrd; |
498 | |
499 | lrd.logtid = 0; |
500 | lrd.backchain = 0; |
501 | lrd.type = cpu_to_le16(LOG_MOUNT); |
502 | lrd.length = 0; |
503 | lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev)); |
504 | lmLog(log, NULL, &lrd, NULL); |
505 | |
506 | return 0; |
507 | } |
508 |
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