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Linux/fs/jfs/jfs_mount.c

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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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