jfs_mount.c

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    1 /*
    2  *   Copyright (c) International Business Machines Corp., 2000-2002
    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/locks.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: Faild 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 == 0) {
  151                         jfs_err("jfs_mount: Faild 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 = 0;
  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 //errout42: /* close fileset inode allocation map */
  201         diUnmount(ipimap, 1);
  202 
  203       errout41:         /* close fileset inode allocation map inode */
  204         diFreeSpecial(ipimap);
  205 
  206       errout40:         /* fileset closed */
  207 
  208         /* close secondary aggregate inode allocation map */
  209         if (ipaimap2) {
  210                 diUnmount(ipaimap2, 1);
  211                 diFreeSpecial(ipaimap2);
  212         }
  213 
  214       errout35:
  215 
  216         /* close aggregate block allocation map */
  217         dbUnmount(ipbmap, 1);
  218         diFreeSpecial(ipbmap);
  219 
  220       errout22:         /* close aggregate inode allocation map */
  221 
  222         diUnmount(ipaimap, 1);
  223 
  224       errout21:         /* close aggregate inodes */
  225         diFreeSpecial(ipaimap);
  226       errout20:         /* aggregate closed */
  227 
  228       out:
  229 
  230         if (rc)
  231                 jfs_err("Mount JFS Failure: %d", rc);
  232 
  233         return rc;
  234 }
  235 
  236 /*
  237  * NAME:        jfs_mount_rw(sb, remount)
  238  *
  239  * FUNCTION:    Completes read-write mount, or remounts read-only volume
  240  *              as read-write
  241  */
  242 int jfs_mount_rw(struct super_block *sb, int remount)
  243 {
  244         struct jfs_sb_info *sbi = JFS_SBI(sb);  
  245         struct jfs_log *log;
  246         int rc;
  247 
  248         /*
  249          * If we are re-mounting a previously read-only volume, we want to
  250          * re-read the inode and block maps, since fsck.jfs may have updated
  251          * them.
  252          */
  253         if (remount) {
  254                 if (chkSuper(sb) || (sbi->state != FM_CLEAN))
  255                         return -EINVAL;
  256 
  257                 truncate_inode_pages(sbi->ipimap->i_mapping, 0);
  258                 truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
  259                 diUnmount(sbi->ipimap, 1);
  260                 if ((rc = diMount(sbi->ipimap))) {
  261                         jfs_err("jfs_mount_rw: diMount failed!");
  262                         return rc;
  263                 }
  264 
  265                 dbUnmount(sbi->ipbmap, 1);
  266                 if ((rc = dbMount(sbi->ipbmap))) {
  267                         jfs_err("jfs_mount_rw: dbMount failed!");
  268                         return rc;
  269                 }
  270         }
  271 
  272         /*
  273          * open/initialize log
  274          */
  275         if ((rc = lmLogOpen(sb, &log)))
  276                 return rc;
  277 
  278         JFS_SBI(sb)->log = log;
  279 
  280         /*
  281          * update file system superblock;
  282          */
  283         if ((rc = updateSuper(sb, FM_MOUNT))) {
  284                 jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
  285                 lmLogClose(sb, log);
  286                 JFS_SBI(sb)->log = 0;
  287                 return rc;
  288         }
  289 
  290         /*
  291          * write MOUNT log record of the file system
  292          */
  293         logMOUNT(sb);
  294 
  295         return rc;
  296 }
  297 
  298 /*
  299  *      chkSuper()
  300  *
  301  * validate the superblock of the file system to be mounted and 
  302  * get the file system parameters.
  303  *
  304  * returns
  305  *      0 with fragsize set if check successful
  306  *      error code if not successful
  307  */
  308 static int chkSuper(struct super_block *sb)
  309 {
  310         int rc = 0;
  311         struct jfs_sb_info *sbi = JFS_SBI(sb);
  312         struct jfs_superblock *j_sb;
  313         struct buffer_head *bh;
  314         int AIM_bytesize, AIT_bytesize;
  315         int expected_AIM_bytesize, expected_AIT_bytesize;
  316         s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
  317         s64 byte_addr_diff0, byte_addr_diff1;
  318         s32 bsize;
  319 
  320         if ((rc = readSuper(sb, &bh)))
  321                 return rc;
  322         j_sb = (struct jfs_superblock *)bh->b_data;
  323 
  324         /*
  325          * validate superblock
  326          */
  327         /* validate fs signature */
  328         if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) ||
  329             j_sb->s_version > cpu_to_le32(JFS_VERSION)) {
  330                 //rc = EFORMAT;
  331                 rc = EINVAL;
  332                 goto out;
  333         }
  334 
  335         bsize = le32_to_cpu(j_sb->s_bsize);
  336 #ifdef _JFS_4K
  337         if (bsize != PSIZE) {
  338                 jfs_err("Currently only 4K block size supported!");
  339                 rc = EINVAL;
  340                 goto out;
  341         }
  342 #endif                          /* _JFS_4K */
  343 
  344         jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
  345                  le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
  346                  (unsigned long long) le64_to_cpu(j_sb->s_size));
  347 
  348         /* validate the descriptors for Secondary AIM and AIT */
  349         if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
  350             cpu_to_le32(JFS_BAD_SAIT)) {
  351                 expected_AIM_bytesize = 2 * PSIZE;
  352                 AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
  353                 expected_AIT_bytesize = 4 * PSIZE;
  354                 AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
  355                 AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
  356                 AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
  357                 byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
  358                 fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
  359                 byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
  360                 if ((AIM_bytesize != expected_AIM_bytesize) ||
  361                     (AIT_bytesize != expected_AIT_bytesize) ||
  362                     (byte_addr_diff0 != AIM_bytesize) ||
  363                     (byte_addr_diff1 <= AIT_bytesize))
  364                         j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
  365         }
  366 
  367         if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
  368             cpu_to_le32(JFS_GROUPCOMMIT))
  369                 j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT);
  370 
  371         /* validate fs state */
  372         if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
  373             !(sb->s_flags & MS_RDONLY)) {
  374                 jfs_err("jfs_mount: Mount Failure: File System Dirty.");
  375                 rc = EINVAL;
  376                 goto out;
  377         }
  378 
  379         sbi->state = le32_to_cpu(j_sb->s_state);
  380         sbi->mntflag = le32_to_cpu(j_sb->s_flag);
  381 
  382         /*
  383          * JFS always does I/O by 4K pages.  Don't tell the buffer cache
  384          * that we use anything else (leave s_blocksize alone).
  385          */
  386         sbi->bsize = bsize;
  387         sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);
  388 
  389         /*
  390          * For now, ignore s_pbsize, l2bfactor.  All I/O going through buffer
  391          * cache.
  392          */
  393         sbi->nbperpage = PSIZE >> sbi->l2bsize;
  394         sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
  395         sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
  396         if (sbi->mntflag & JFS_INLINELOG)
  397                 sbi->logpxd = j_sb->s_logpxd;
  398         else {
  399                 sbi->logdev = to_kdev_t(le32_to_cpu(j_sb->s_logdev));
  400                 memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
  401                 memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
  402         }
  403         sbi->fsckpxd = j_sb->s_fsckpxd;
  404         sbi->ait2 = j_sb->s_ait2;
  405 
  406       out:
  407         brelse(bh);
  408         return rc;
  409 }
  410 
  411 
  412 /*
  413  *      updateSuper()
  414  *
  415  * update synchronously superblock if it is mounted read-write.
  416  */
  417 int updateSuper(struct super_block *sb, uint state)
  418 {
  419         struct jfs_superblock *j_sb;
  420         struct jfs_sb_info *sbi = JFS_SBI(sb);
  421         struct buffer_head *bh;
  422         int rc;
  423 
  424         /*
  425          * Only fsck can fix dirty state
  426          */
  427         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(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         ll_rw_block(WRITE, 1, &bh);
  453         wait_on_buffer(bh);
  454         brelse(bh);
  455 
  456         return 0;
  457 }
  458 
  459 
  460 /*
  461  *      readSuper()
  462  *
  463  * read superblock by raw sector address
  464  */
  465 int readSuper(struct super_block *sb, struct buffer_head **bpp)
  466 {
  467         /* read in primary superblock */
  468         *bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
  469         if (*bpp)
  470                 return 0;
  471 
  472         /* read in secondary/replicated superblock */
  473         *bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
  474         if (*bpp)
  475                 return 0;
  476 
  477         return -EIO;
  478 }
  479 
  480 
  481 /*
  482  *      logMOUNT()
  483  *
  484  * function: write a MOUNT log record for file system.
  485  *
  486  * MOUNT record keeps logredo() from processing log records
  487  * for this file system past this point in log.
  488  * it is harmless if mount fails.
  489  *
  490  * note: MOUNT record is at aggregate level, not at fileset level, 
  491  * since log records of previous mounts of a fileset
  492  * (e.g., AFTER record of extent allocation) have to be processed 
  493  * to update block allocation map at aggregate level.
  494  */
  495 static int logMOUNT(struct super_block *sb)
  496 {
  497         struct jfs_log *log = JFS_SBI(sb)->log;
  498         struct lrd lrd;
  499 
  500         lrd.logtid = 0;
  501         lrd.backchain = 0;
  502         lrd.type = cpu_to_le16(LOG_MOUNT);
  503         lrd.length = 0;
  504         lrd.aggregate = cpu_to_le32(kdev_t_to_nr(sb->s_dev));
  505         lmLog(log, NULL, &lrd, NULL);
  506 
  507         return 0;
  508 }
Cache object: 21f3729febed3a8895640ce964f93022
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FreeBSD/Linux Kernel Cross Reference sys/fs/jfs/jfs_mount.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/jfs/jfs_mount.c
