LCOV - code coverage report
Current view: top level - lkbce/fs/isofs - inode.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 410 779 52.6 %
Date: 2017-01-25 Functions: 30 37 81.1 %

          Line data    Source code
       1             : /*
       2             :  *  linux/fs/isofs/inode.c
       3             :  *
       4             :  *  (C) 1991  Linus Torvalds - minix filesystem
       5             :  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
       6             :  *      1994  Eberhard Mönkeberg - multi session handling.
       7             :  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
       8             :  *      1997  Gordon Chaffee - Joliet CDs
       9             :  *      1998  Eric Lammerts - ISO 9660 Level 3
      10             :  *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
      11             :  *      2004  Paul Serice - NFS Export Operations
      12             :  */
      13             : 
      14             : #include <linux/init.h>
      15             : #include <linux/module.h>
      16             : 
      17             : #include <linux/slab.h>
      18             : #include <linux/nls.h>
      19             : #include <linux/ctype.h>
      20             : #include <linux/smp_lock.h>
      21             : #include <linux/statfs.h>
      22             : #include <linux/cdrom.h>
      23             : #include <linux/parser.h>
      24             : 
      25             : #include "isofs.h"
      26             : #include "zisofs.h"
      27             : 
      28             : #define BEQUIET
      29             : 
      30             : static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
      31             : static int isofs_hash(struct dentry *parent, struct qstr *qstr);
      32             : static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
      33             : static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
      34             : 
      35             : #ifdef CONFIG_JOLIET
      36             : static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
      37             : static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
      38             : static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
      39             : static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
      40             : #endif
      41             : 
      42             : static void isofs_put_super(struct super_block *sb)
      43             : {
      44           4 :         struct isofs_sb_info *sbi = ISOFS_SB(sb);
      45           1 : 
      46             : #ifdef CONFIG_JOLIET
      47           1 :         lock_kernel();
      48             : 
      49           1 :         unload_nls(sbi->s_nls_iocharset);
      50             : 
      51           1 :         unlock_kernel();
      52             : #endif
      53             : 
      54           1 :         kfree(sbi);
      55           1 :         sb->s_fs_info = NULL;
      56           1 :         return;
      57             : }
      58             : 
      59             : static int isofs_read_inode(struct inode *);
      60             : static int isofs_statfs (struct dentry *, struct kstatfs *);
      61             : 
      62           1 : static struct kmem_cache *isofs_inode_cachep;
      63             : 
      64             : static struct inode *isofs_alloc_inode(struct super_block *sb)
      65             : {
      66           1 :         struct iso_inode_info *ei;
      67           3 :         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
      68           2 :         if (!ei)
      69           1 :                 return NULL;
      70           1 :         return &ei->vfs_inode;
      71             : }
      72             : 
      73             : static void isofs_destroy_inode(struct inode *inode)
      74             : {
      75           4 :         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
      76           1 : }
      77             : 
      78             : static void init_once(void *foo)
      79             : {
      80           0 :         struct iso_inode_info *ei = foo;
      81             : 
      82           0 :         inode_init_once(&ei->vfs_inode);
      83           0 : }
      84             : 
      85             : static int init_inodecache(void)
      86             : {
      87           1 :         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
      88             :                                         sizeof(struct iso_inode_info),
      89             :                                         0, (SLAB_RECLAIM_ACCOUNT|
      90             :                                         SLAB_MEM_SPREAD),
      91             :                                         init_once);
      92           2 :         if (isofs_inode_cachep == NULL)
      93           1 :                 return -ENOMEM;
      94           1 :         return 0;
      95             : }
      96             : 
      97             : static void destroy_inodecache(void)
      98             : {
      99           3 :         kmem_cache_destroy(isofs_inode_cachep);
     100           3 : }
     101             : 
     102             : static int isofs_remount(struct super_block *sb, int *flags, char *data)
     103             : {
     104             :         /* we probably want a lot more here */
     105           1 :         *flags |= MS_RDONLY;
     106           1 :         return 0;
     107             : }
     108             : 
     109           1 : static const struct super_operations isofs_sops = {
     110             :         .alloc_inode    = isofs_alloc_inode,
     111             :         .destroy_inode  = isofs_destroy_inode,
     112             :         .put_super      = isofs_put_super,
     113             :         .statfs         = isofs_statfs,
     114             :         .remount_fs     = isofs_remount,
     115             :         .show_options   = generic_show_options,
     116             : };
     117             : 
     118             : 
     119           1 : static const struct dentry_operations isofs_dentry_ops[] = {
     120             :         {
     121             :                 .d_hash         = isofs_hash,
     122             :                 .d_compare      = isofs_dentry_cmp,
     123             :         },
     124             :         {
     125             :                 .d_hash         = isofs_hashi,
     126             :                 .d_compare      = isofs_dentry_cmpi,
     127             :         },
     128             : #ifdef CONFIG_JOLIET
     129             :         {
     130             :                 .d_hash         = isofs_hash_ms,
     131             :                 .d_compare      = isofs_dentry_cmp_ms,
     132             :         },
     133             :         {
     134             :                 .d_hash         = isofs_hashi_ms,
     135             :                 .d_compare      = isofs_dentry_cmpi_ms,
     136           1 :         },
     137             : #endif
     138             : };
     139             : 
     140             : struct iso9660_options{
     141             :         unsigned int rock:1;
     142             :         unsigned int joliet:1;
     143             :         unsigned int cruft:1;
     144             :         unsigned int hide:1;
     145             :         unsigned int showassoc:1;
     146             :         unsigned int nocompress:1;
     147             :         unsigned int overriderockperm:1;
     148             :         unsigned int uid_set:1;
     149             :         unsigned int gid_set:1;
     150             :         unsigned int utf8:1;
     151             :         unsigned char map;
     152             :         unsigned char check;
     153             :         unsigned int blocksize;
     154             :         mode_t fmode;
     155             :         mode_t dmode;
     156             :         gid_t gid;
     157             :         uid_t uid;
     158             :         char *iocharset;
     159             :         /* LVE */
     160             :         s32 session;
     161             :         s32 sbsector;
     162             : };
     163             : 
     164             : /*
     165             :  * Compute the hash for the isofs name corresponding to the dentry.
     166             :  */
     167             : static int
     168             : isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
     169             : {
     170           2 :         const char *name;
     171           2 :         int len;
     172             : 
     173           4 :         len = qstr->len;
     174           4 :         name = qstr->name;
     175           4 :         if (ms) {
     176          10 :                 while (len && name[len-1] == '.')
     177           4 :                         len--;
     178           4 :         }
     179             : 
     180           8 :         qstr->hash = full_name_hash(name, len);
     181             : 
     182           2 :         return 0;
     183             : }
     184             : 
     185             : /*
     186             :  * Compute the hash for the isofs name corresponding to the dentry.
     187             :  */
     188             : static int
     189             : isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
     190             : {
     191           2 :         const char *name;
     192           2 :         int len;
     193           2 :         char c;
     194           2 :         unsigned long hash;
     195           2 : 
     196           6 :         len = qstr->len;
     197           6 :         name = qstr->name;
     198           6 :         if (ms) {
     199          10 :                 while (len && name[len-1] == '.')
     200           4 :                         len--;
     201           4 :         }
     202             : 
     203           4 :         hash = init_name_hash();
     204          12 :         while (len--) {
     205          12 :                 c = tolower(*name++);
     206           6 :                 hash = partial_name_hash(c, hash);
     207             :         }
     208           8 :         qstr->hash = end_name_hash(hash);
     209             : 
     210           2 :         return 0;
     211             : }
     212             : 
     213             : /*
     214             :  * Case insensitive compare of two isofs names.
     215             :  */
     216             : static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
     217             :                                 struct qstr *b, int ms)
     218             : {
     219           2 :         int alen, blen;
     220           2 : 
     221           2 :         /* A filename cannot end in '.' or we treat it like it has none */
     222           4 :         alen = a->len;
     223           4 :         blen = b->len;
     224           4 :         if (ms) {
     225          10 :                 while (alen && a->name[alen-1] == '.')
     226           4 :                         alen--;
     227          14 :                 while (blen && b->name[blen-1] == '.')
     228           4 :                         blen--;
     229           4 :         }
     230           8 :         if (alen == blen) {
     231          20 :                 if (strnicmp(a->name, b->name, alen) == 0)
     232           4 :                         return 0;
     233             :         }
     234           4 :         return 1;
     235             : }
     236             : 
     237             : /*
     238             :  * Case sensitive compare of two isofs names.
     239             :  */
     240             : static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
     241             :                                         struct qstr *b, int ms)
     242             : {
     243           2 :         int alen, blen;
     244           2 : 
     245           2 :         /* A filename cannot end in '.' or we treat it like it has none */
     246           4 :         alen = a->len;
     247           4 :         blen = b->len;
     248           4 :         if (ms) {
     249          10 :                 while (alen && a->name[alen-1] == '.')
     250           4 :                         alen--;
     251          14 :                 while (blen && b->name[blen-1] == '.')
     252           4 :                         blen--;
     253           4 :         }
     254           8 :         if (alen == blen) {
     255          20 :                 if (strncmp(a->name, b->name, alen) == 0)
     256           4 :                         return 0;
     257             :         }
     258           4 :         return 1;
     259             : }
     260             : 
     261             : static int
     262             : isofs_hash(struct dentry *dentry, struct qstr *qstr)
     263             : {
     264           4 :         return isofs_hash_common(dentry, qstr, 0);
     265             : }
     266             : 
     267             : static int
     268             : isofs_hashi(struct dentry *dentry, struct qstr *qstr)
     269             : {
     270           4 :         return isofs_hashi_common(dentry, qstr, 0);
     271             : }
     272             : 
     273             : static int
     274             : isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
     275             : {
     276           5 :         return isofs_dentry_cmp_common(dentry, a, b, 0);
     277             : }
     278             : 
     279             : static int
     280             : isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
     281             : {
     282           5 :         return isofs_dentry_cmpi_common(dentry, a, b, 0);
     283             : }
     284             : 
     285             : #ifdef CONFIG_JOLIET
     286             : static int
     287             : isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
     288             : {
     289           4 :         return isofs_hash_common(dentry, qstr, 1);
     290             : }
     291             : 
     292             : static int
     293             : isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
     294             : {
     295           4 :         return isofs_hashi_common(dentry, qstr, 1);
     296             : }
     297             : 
     298             : static int
     299             : isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
     300             : {
     301           5 :         return isofs_dentry_cmp_common(dentry, a, b, 1);
     302             : }
     303             : 
     304             : static int
     305             : isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
     306             : {
     307           5 :         return isofs_dentry_cmpi_common(dentry, a, b, 1);
     308             : }
     309             : #endif
     310             : 
     311             : enum {
     312             :         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
     313             :         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
     314             :         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
     315             :         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
     316             : };
     317             : 
     318           1 : static const match_table_t tokens = {
     319             :         {Opt_norock, "norock"},
     320             :         {Opt_nojoliet, "nojoliet"},
     321             :         {Opt_unhide, "unhide"},
     322             :         {Opt_hide, "hide"},
     323             :         {Opt_showassoc, "showassoc"},
     324             :         {Opt_cruft, "cruft"},
     325             :         {Opt_utf8, "utf8"},
     326             :         {Opt_iocharset, "iocharset=%s"},
     327             :         {Opt_map_a, "map=acorn"},
     328             :         {Opt_map_a, "map=a"},
     329             :         {Opt_map_n, "map=normal"},
     330             :         {Opt_map_n, "map=n"},
     331             :         {Opt_map_o, "map=off"},
     332             :         {Opt_map_o, "map=o"},
     333             :         {Opt_session, "session=%u"},
     334             :         {Opt_sb, "sbsector=%u"},
     335             :         {Opt_check_r, "check=relaxed"},
     336             :         {Opt_check_r, "check=r"},
     337             :         {Opt_check_s, "check=strict"},
     338             :         {Opt_check_s, "check=s"},
     339             :         {Opt_uid, "uid=%u"},
     340             :         {Opt_gid, "gid=%u"},
     341             :         {Opt_mode, "mode=%u"},
     342             :         {Opt_dmode, "dmode=%u"},
     343             :         {Opt_overriderockperm, "overriderockperm"},
     344             :         {Opt_block, "block=%u"},
     345             :         {Opt_ignore, "conv=binary"},
     346             :         {Opt_ignore, "conv=b"},
     347             :         {Opt_ignore, "conv=text"},
     348             :         {Opt_ignore, "conv=t"},
     349             :         {Opt_ignore, "conv=mtext"},
     350             :         {Opt_ignore, "conv=m"},
     351             :         {Opt_ignore, "conv=auto"},
     352             :         {Opt_ignore, "conv=a"},
     353             :         {Opt_nocompress, "nocompress"},
     354             :         {Opt_err, NULL}
     355             : };
     356             : 
     357             : static int parse_options(char *options, struct iso9660_options *popt)
     358             : {
     359           0 :         char *p;
     360           0 :         int option;
     361           0 : 
     362           0 :         popt->map = 'n';
     363           0 :         popt->rock = 1;
     364           0 :         popt->joliet = 1;
     365           0 :         popt->cruft = 0;
     366           0 :         popt->hide = 0;
     367           0 :         popt->showassoc = 0;
     368           0 :         popt->check = 'u';           /* unset */
     369           0 :         popt->nocompress = 0;
     370           0 :         popt->blocksize = 1024;
     371           0 :         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
     372           0 :         popt->uid_set = 0;
     373           0 :         popt->gid_set = 0;
     374           0 :         popt->gid = 0;
     375           0 :         popt->uid = 0;
     376           0 :         popt->iocharset = NULL;
     377           0 :         popt->utf8 = 0;
     378           0 :         popt->overriderockperm = 0;
     379           0 :         popt->session=-1;
     380           0 :         popt->sbsector=-1;
     381           0 :         if (!options)
     382           0 :                 return 1;
     383             : 
     384           0 :         while ((p = strsep(&options, ",")) != NULL) {
     385           0 :                 int token;
     386           0 :                 substring_t args[MAX_OPT_ARGS];
     387             :                 unsigned n;
     388             : 
     389           0 :                 if (!*p)
     390           0 :                         continue;
     391             : 
     392           0 :                 token = match_token(p, tokens, args);
     393             :                 switch (token) {
     394           0 :                 case Opt_norock:
     395           0 :                         popt->rock = 0;
     396           0 :                         break;
     397           0 :                 case Opt_nojoliet:
     398           0 :                         popt->joliet = 0;
     399           0 :                         break;
     400           0 :                 case Opt_hide:
     401           0 :                         popt->hide = 1;
     402           0 :                         break;
     403           0 :                 case Opt_unhide:
     404           0 :                 case Opt_showassoc:
     405           0 :                         popt->showassoc = 1;
     406           0 :                         break;
     407           0 :                 case Opt_cruft:
     408           0 :                         popt->cruft = 1;
     409           0 :                         break;
     410           0 :                 case Opt_utf8:
     411           0 :                         popt->utf8 = 1;
     412           0 :                         break;
     413           0 : #ifdef CONFIG_JOLIET
     414           0 :                 case Opt_iocharset:
     415           0 :                         popt->iocharset = match_strdup(&args[0]);
     416           0 :                         break;
     417           0 : #endif
     418           0 :                 case Opt_map_a:
     419           0 :                         popt->map = 'a';
     420           0 :                         break;
     421           0 :                 case Opt_map_o:
     422           0 :                         popt->map = 'o';
     423           0 :                         break;
     424           0 :                 case Opt_map_n:
     425           0 :                         popt->map = 'n';
     426           0 :                         break;
     427           0 :                 case Opt_session:
     428           0 :                         if (match_int(&args[0], &option))
     429           0 :                                 return 0;
     430           0 :                         n = option;
     431           0 :                         if (n > 99)
     432           0 :                                 return 0;
     433           0 :                         popt->session = n + 1;
     434           0 :                         break;
     435           0 :                 case Opt_sb:
     436           0 :                         if (match_int(&args[0], &option))
     437           0 :                                 return 0;
     438           0 :                         popt->sbsector = option;
     439           0 :                         break;
     440           0 :                 case Opt_check_r:
     441           0 :                         popt->check = 'r';
     442           0 :                         break;
     443           0 :                 case Opt_check_s:
     444           0 :                         popt->check = 's';
     445           0 :                         break;
     446           0 :                 case Opt_ignore:
     447           0 :                         break;
     448           0 :                 case Opt_uid:
     449           0 :                         if (match_int(&args[0], &option))
     450           0 :                                 return 0;
     451           0 :                         popt->uid = option;
     452           0 :                         popt->uid_set = 1;
     453           0 :                         break;
     454           0 :                 case Opt_gid:
     455           0 :                         if (match_int(&args[0], &option))
     456           0 :                                 return 0;
     457           0 :                         popt->gid = option;
     458           0 :                         popt->gid_set = 1;
     459           0 :                         break;
     460           0 :                 case Opt_mode:
     461           0 :                         if (match_int(&args[0], &option))
     462           0 :                                 return 0;
     463           0 :                         popt->fmode = option;
     464           0 :                         break;
     465           0 :                 case Opt_dmode:
     466           0 :                         if (match_int(&args[0], &option))
     467           0 :                                 return 0;
     468           0 :                         popt->dmode = option;
     469           0 :                         break;
     470           0 :                 case Opt_overriderockperm:
     471           0 :                         popt->overriderockperm = 1;
     472           0 :                         break;
     473           0 :                 case Opt_block:
     474           0 :                         if (match_int(&args[0], &option))
     475           0 :                                 return 0;
     476           0 :                         n = option;
     477           0 :                         if (n != 512 && n != 1024 && n != 2048)
     478           0 :                                 return 0;
     479           0 :                         popt->blocksize = n;
     480           0 :                         break;
     481           0 :                 case Opt_nocompress:
     482           0 :                         popt->nocompress = 1;
     483           0 :                         break;
     484           0 :                 default:
     485           0 :                         return 0;
     486             :                 }
     487             :         }
     488           0 :         return 1;
     489           0 : }
     490             : 
     491             : /*
     492             :  * look if the driver can tell the multi session redirection value
     493             :  *
     494             :  * don't change this if you don't know what you do, please!
     495             :  * Multisession is legal only with XA disks.
     496             :  * A non-XA disk with more than one volume descriptor may do it right, but
     497             :  * usually is written in a nowhere standardized "multi-partition" manner.
     498             :  * Multisession uses absolute addressing (solely the first frame of the whole
     499             :  * track is #0), multi-partition uses relative addressing (each first frame of
     500             :  * each track is #0), and a track is not a session.
     501             :  *
     502             :  * A broken CDwriter software or drive firmware does not set new standards,
     503             :  * at least not if conflicting with the existing ones.
     504             :  *
     505             :  * emoenke@gwdg.de
     506             :  */
     507             : #define WE_OBEY_THE_WRITTEN_STANDARDS 1
     508             : 
     509             : static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
     510             : {
     511           0 :         struct cdrom_multisession ms_info;
     512           0 :         unsigned int vol_desc_start;
     513           0 :         struct block_device *bdev = sb->s_bdev;
     514           0 :         int i;
     515           0 : 
     516           0 :         vol_desc_start=0;
     517           0 :         ms_info.addr_format=CDROM_LBA;
     518           0 :         if(session >= 0 && session <= 99) {
     519             :                 struct cdrom_tocentry Te;
     520           0 :                 Te.cdte_track=session;
     521           0 :                 Te.cdte_format=CDROM_LBA;
     522           0 :                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
     523           0 :                 if (!i) {
     524           0 :                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
     525             :                                 session, Te.cdte_addr.lba,
     526             :                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
     527           0 :                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
     528           0 :                                 return Te.cdte_addr.lba;
     529             :                 }
     530             : 
     531           0 :                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
     532             :         }
     533           0 :         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
     534           0 :         if (session > 0)
     535           0 :                 printk(KERN_ERR "ISOFS: Invalid session number\n");
     536             : #if 0
     537             :         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
     538             :         if (i==0) {
     539             :                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
     540             :                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
     541             :         }
     542             : #endif
     543           0 :         if (i==0)
     544             : #if WE_OBEY_THE_WRITTEN_STANDARDS
     545           0 :                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
     546             : #endif
     547           0 :                         vol_desc_start=ms_info.addr.lba;
     548           0 :         return vol_desc_start;
     549             : }
     550             : 
     551             : /*
     552             :  * Initialize the superblock and read the root inode.
     553             :  *
     554             :  * Note: a check_disk_change() has been done immediately prior
     555             :  * to this call, so we don't need to check again.
     556             :  */
     557             : static int isofs_fill_super(struct super_block *s, void *data, int silent)
     558             : {
     559           0 :         struct buffer_head *bh = NULL, *pri_bh = NULL;
     560           0 :         struct hs_primary_descriptor *h_pri = NULL;
     561           0 :         struct iso_primary_descriptor *pri = NULL;
     562           0 :         struct iso_supplementary_descriptor *sec = NULL;
     563           0 :         struct iso_directory_record *rootp;
     564           0 :         struct inode *inode;
     565           0 :         struct iso9660_options opt;
     566           0 :         struct isofs_sb_info *sbi;
     567           0 :         unsigned long first_data_zone;
     568           0 :         int joliet_level = 0;
     569           0 :         int iso_blknum, block;
     570           0 :         int orig_zonesize;
     571           0 :         int table, error = -EINVAL;
     572           0 :         unsigned int vol_desc_start;
     573           0 : 
     574           0 :         save_mount_options(s, data);
     575           0 : 
     576           0 :         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
     577           0 :         if (!sbi)
     578           0 :                 return -ENOMEM;
     579           0 :         s->s_fs_info = sbi;
     580           0 : 
     581           0 :         if (!parse_options((char *)data, &opt))
     582           0 :                 goto out_freesbi;
     583           0 : 
     584           0 :         /*
     585           0 :          * First of all, get the hardware blocksize for this device.
     586           0 :          * If we don't know what it is, or the hardware blocksize is
     587           0 :          * larger than the blocksize the user specified, then use
     588           0 :          * that value.
     589           0 :          */
     590           0 :         /*
     591           0 :          * What if bugger tells us to go beyond page size?
     592           0 :          */
     593           0 :         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
     594           0 : 
     595           0 :         sbi->s_high_sierra = 0; /* default is iso9660 */
     596           0 : 
     597           0 :         vol_desc_start = (opt.sbsector != -1) ?
     598           0 :                 opt.sbsector : isofs_get_last_session(s,opt.session);
     599           0 : 
     600           0 :         for (iso_blknum = vol_desc_start+16;
     601           0 :                 iso_blknum < vol_desc_start+100; iso_blknum++) {
     602             :                 struct hs_volume_descriptor *hdp;
     603           0 :                 struct iso_volume_descriptor  *vdp;
     604             : 
     605           0 :                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
     606           0 :                 if (!(bh = sb_bread(s, block)))
     607           0 :                         goto out_no_read;
     608             : 
     609           0 :                 vdp = (struct iso_volume_descriptor *)bh->b_data;
     610           0 :                 hdp = (struct hs_volume_descriptor *)bh->b_data;
     611             : 
     612             :                 /*
     613             :                  * Due to the overlapping physical location of the descriptors,
     614             :                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
     615             :                  * proper identification in this case, we first check for ISO.
     616             :                  */
     617           0 :                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
     618           0 :                         if (isonum_711(vdp->type) == ISO_VD_END)
     619           0 :                                 break;
     620           0 :                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
     621           0 :                                 if (pri == NULL) {
     622           0 :                                         pri = (struct iso_primary_descriptor *)vdp;
     623             :                                         /* Save the buffer in case we need it ... */
     624           0 :                                         pri_bh = bh;
     625           0 :                                         bh = NULL;
     626             :                                 }
     627             :                         }
     628             : #ifdef CONFIG_JOLIET
     629           0 :                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
     630           0 :                                 sec = (struct iso_supplementary_descriptor *)vdp;
     631           0 :                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
     632           0 :                                         if (opt.joliet) {
     633           0 :                                                 if (sec->escape[2] == 0x40)
     634           0 :                                                         joliet_level = 1;
     635           0 :                                                 else if (sec->escape[2] == 0x43)
     636           0 :                                                         joliet_level = 2;
     637           0 :                                                 else if (sec->escape[2] == 0x45)
     638           0 :                                                         joliet_level = 3;
     639             : 
     640           0 :                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
     641             :                                                         "Microsoft Joliet Level %d\n",
     642             :                                                         joliet_level);
     643             :                                         }
     644           0 :                                         goto root_found;
     645             :                                 } else {
     646             :                                 /* Unknown supplementary volume descriptor */
     647           0 :                                 sec = NULL;
     648             :                                 }
     649             :                         }
     650             : #endif
     651             :                 } else {
     652           0 :                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
     653           0 :                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
     654           0 :                                         goto out_freebh;
     655             : 
     656           0 :                                 sbi->s_high_sierra = 1;
     657           0 :                                 opt.rock = 0;
     658           0 :                                 h_pri = (struct hs_primary_descriptor *)vdp;
     659           0 :                                 goto root_found;
     660             :                         }
     661             :                 }
     662             : 
     663             :                 /* Just skip any volume descriptors we don't recognize */
     664             : 
     665           0 :                 brelse(bh);
     666           0 :                 bh = NULL;
     667             :         }
     668             :         /*
     669             :          * If we fall through, either no volume descriptor was found,
     670             :          * or else we passed a primary descriptor looking for others.
     671             :          */
     672           0 :         if (!pri)
     673           0 :                 goto out_unknown_format;
     674           0 :         brelse(bh);
     675           0 :         bh = pri_bh;
     676           0 :         pri_bh = NULL;
     677             : 
     678           0 : root_found:
     679             : 
     680           0 :         if (joliet_level && (pri == NULL || !opt.rock)) {
     681             :                 /* This is the case of Joliet with the norock mount flag.
     682             :                  * A disc with both Joliet and Rock Ridge is handled later
     683             :                  */
     684           0 :                 pri = (struct iso_primary_descriptor *) sec;
     685             :         }
     686             : 
     687           0 :         if(sbi->s_high_sierra){
     688           0 :                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
     689           0 :                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
     690           0 :                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
     691           0 :                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
     692             :         } else {
     693           0 :                 if (!pri)
     694           0 :                         goto out_freebh;
     695           0 :                 rootp = (struct iso_directory_record *) pri->root_directory_record;
     696           0 :                 sbi->s_nzones = isonum_733(pri->volume_space_size);
     697           0 :                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
     698           0 :                 sbi->s_max_size = isonum_733(pri->volume_space_size);
     699             :         }
     700             : 
     701           0 :         sbi->s_ninodes = 0; /* No way to figure this out easily */
     702             : 
     703           0 :         orig_zonesize = sbi->s_log_zone_size;
     704             :         /*
     705             :          * If the zone size is smaller than the hardware sector size,
     706             :          * this is a fatal error.  This would occur if the disc drive
     707             :          * had sectors that were 2048 bytes, but the filesystem had
     708             :          * blocks that were 512 bytes (which should only very rarely
     709             :          * happen.)
     710             :          */
     711           0 :         if (orig_zonesize < opt.blocksize)
     712           0 :                 goto out_bad_size;
     713             : 
     714             :         /* RDE: convert log zone size to bit shift */
     715             :         switch (sbi->s_log_zone_size) {
     716           0 :         case  512: sbi->s_log_zone_size =  9; break;
     717           0 :         case 1024: sbi->s_log_zone_size = 10; break;
     718           0 :         case 2048: sbi->s_log_zone_size = 11; break;
     719           0 : 
     720           0 :         default:
     721           0 :                 goto out_bad_zone_size;
     722             :         }
     723             : 
     724           0 :         s->s_magic = ISOFS_SUPER_MAGIC;
     725           0 :         s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
     726             : 
     727             :         /*
     728             :          * The CDROM is read-only, has no nodes (devices) on it, and since
     729             :          * all of the files appear to be owned by root, we really do not want
     730             :          * to allow suid.  (suid or devices will not show up unless we have
     731             :          * Rock Ridge extensions)
     732             :          */
     733             : 
     734           0 :         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
     735             : 
     736             :         /* Set this for reference. Its not currently used except on write
     737             :            which we don't have .. */
     738             : 
     739           0 :         first_data_zone = isonum_733(rootp->extent) +
     740             :                           isonum_711(rootp->ext_attr_length);
     741           0 :         sbi->s_firstdatazone = first_data_zone;
     742             : #ifndef BEQUIET
     743             :         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
     744             :                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
     745             :         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
     746             :         if(sbi->s_high_sierra)
     747             :                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
     748             : #endif
     749             : 
     750             :         /*
     751             :          * If the Joliet level is set, we _may_ decide to use the
     752             :          * secondary descriptor, but can't be sure until after we
     753             :          * read the root inode. But before reading the root inode
     754             :          * we may need to change the device blocksize, and would
     755             :          * rather release the old buffer first. So, we cache the
     756             :          * first_data_zone value from the secondary descriptor.
     757             :          */
     758           0 :         if (joliet_level) {
     759           0 :                 pri = (struct iso_primary_descriptor *) sec;
     760           0 :                 rootp = (struct iso_directory_record *)
     761             :                         pri->root_directory_record;
     762           0 :                 first_data_zone = isonum_733(rootp->extent) +
     763             :                                 isonum_711(rootp->ext_attr_length);
     764             :         }
     765             : 
     766             :         /*
     767             :          * We're all done using the volume descriptor, and may need
     768             :          * to change the device blocksize, so release the buffer now.
     769             :          */
     770           0 :         brelse(pri_bh);
     771           0 :         brelse(bh);
     772             : 
     773             :         /*
     774             :          * Force the blocksize to 512 for 512 byte sectors.  The file
     775             :          * read primitives really get it wrong in a bad way if we don't
     776             :          * do this.
     777             :          *
     778             :          * Note - we should never be setting the blocksize to something
     779             :          * less than the hardware sector size for the device.  If we
     780             :          * do, we would end up having to read larger buffers and split
     781             :          * out portions to satisfy requests.
     782             :          *
     783             :          * Note2- the idea here is that we want to deal with the optimal
     784             :          * zonesize in the filesystem.  If we have it set to something less,
     785             :          * then we have horrible problems with trying to piece together
     786             :          * bits of adjacent blocks in order to properly read directory
     787             :          * entries.  By forcing the blocksize in this way, we ensure
     788             :          * that we will never be required to do this.
     789             :          */
     790           0 :         sb_set_blocksize(s, orig_zonesize);
     791             : 
     792           0 :         sbi->s_nls_iocharset = NULL;
     793             : 
     794             : #ifdef CONFIG_JOLIET
     795           0 :         if (joliet_level && opt.utf8 == 0) {
     796           0 :                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
     797           0 :                 sbi->s_nls_iocharset = load_nls(p);
     798           0 :                 if (! sbi->s_nls_iocharset) {
     799             :                         /* Fail only if explicit charset specified */
     800           0 :                         if (opt.iocharset)
     801           0 :                                 goto out_freesbi;
     802           0 :                         sbi->s_nls_iocharset = load_nls_default();
     803             :                 }
     804             :         }
     805             : #endif
     806           0 :         s->s_op = &isofs_sops;
     807           0 :         s->s_export_op = &isofs_export_ops;
     808           0 :         sbi->s_mapping = opt.map;
     809           0 :         sbi->s_rock = (opt.rock ? 2 : 0);
     810           0 :         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
     811           0 :         sbi->s_cruft = opt.cruft;
     812           0 :         sbi->s_hide = opt.hide;
     813           0 :         sbi->s_showassoc = opt.showassoc;
     814           0 :         sbi->s_uid = opt.uid;
     815           0 :         sbi->s_gid = opt.gid;
     816           0 :         sbi->s_uid_set = opt.uid_set;
     817           0 :         sbi->s_gid_set = opt.gid_set;
     818           0 :         sbi->s_utf8 = opt.utf8;
     819           0 :         sbi->s_nocompress = opt.nocompress;
     820           0 :         sbi->s_overriderockperm = opt.overriderockperm;
     821             :         /*
     822             :          * It would be incredibly stupid to allow people to mark every file
     823             :          * on the disk as suid, so we merely allow them to set the default
     824             :          * permissions.
     825             :          */
     826           0 :         if (opt.fmode != ISOFS_INVALID_MODE)
     827           0 :                 sbi->s_fmode = opt.fmode & 0777;
     828             :         else
     829           0 :                 sbi->s_fmode = ISOFS_INVALID_MODE;
     830           0 :         if (opt.dmode != ISOFS_INVALID_MODE)
     831           0 :                 sbi->s_dmode = opt.dmode & 0777;
     832             :         else
     833           0 :                 sbi->s_dmode = ISOFS_INVALID_MODE;
     834             : 
     835             :         /*
     836             :          * Read the root inode, which _may_ result in changing
     837             :          * the s_rock flag. Once we have the final s_rock value,
     838             :          * we then decide whether to use the Joliet descriptor.
     839             :          */
     840           0 :         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
     841           0 :         if (IS_ERR(inode))
     842           0 :                 goto out_no_root;
     843             : 
     844             :         /*
     845             :          * If this disk has both Rock Ridge and Joliet on it, then we
     846             :          * want to use Rock Ridge by default.  This can be overridden
     847             :          * by using the norock mount option.  There is still one other
     848             :          * possibility that is not taken into account: a Rock Ridge
     849             :          * CD with Unicode names.  Until someone sees such a beast, it
     850             :          * will not be supported.
     851             :          */
     852           0 :         if (sbi->s_rock == 1) {
     853           0 :                 joliet_level = 0;
     854           0 :         } else if (joliet_level) {
     855           0 :                 sbi->s_rock = 0;
     856           0 :                 if (sbi->s_firstdatazone != first_data_zone) {
     857           0 :                         sbi->s_firstdatazone = first_data_zone;
     858           0 :                         printk(KERN_DEBUG
     859             :                                 "ISOFS: changing to secondary root\n");
     860           0 :                         iput(inode);
     861           0 :                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
     862           0 :                         if (IS_ERR(inode))
     863           0 :                                 goto out_no_root;
     864             :                 }
     865             :         }
     866             : 
     867           0 :         if (opt.check == 'u') {
     868             :                 /* Only Joliet is case insensitive by default */
     869           0 :                 if (joliet_level)
     870           0 :                         opt.check = 'r';
     871             :                 else
     872           0 :                         opt.check = 's';
     873             :         }
     874           0 :         sbi->s_joliet_level = joliet_level;
     875             : 
     876             :         /* Make sure the root inode is a directory */
     877           0 :         if (!S_ISDIR(inode->i_mode)) {
     878           0 :                 printk(KERN_WARNING
     879             :                         "isofs_fill_super: root inode is not a directory. "
     880             :                         "Corrupted media?\n");
     881           0 :                 goto out_iput;
     882             :         }
     883             : 
     884             :         /* get the root dentry */
     885           0 :         s->s_root = d_alloc_root(inode);
     886           0 :         if (!(s->s_root))
     887           0 :                 goto out_no_root;
     888             : 
     889           0 :         table = 0;
     890           0 :         if (joliet_level)
     891           0 :                 table += 2;
     892           0 :         if (opt.check == 'r')
     893           0 :                 table++;
     894           0 :         s->s_root->d_op = &isofs_dentry_ops[table];
     895             : 
     896           0 :         kfree(opt.iocharset);
     897             : 
     898           0 :         return 0;
     899           0 : 
     900             :         /*
     901             :          * Display error messages and free resources.
     902             :          */
     903             : out_iput:
     904           0 :         iput(inode);
     905           0 :         goto out_no_inode;
     906           0 : out_no_root:
     907           0 :         error = PTR_ERR(inode);
     908           0 :         if (error != -ENOMEM)
     909           0 :                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
     910             : out_no_inode:
     911             : #ifdef CONFIG_JOLIET
     912           0 :         unload_nls(sbi->s_nls_iocharset);
     913             : #endif
     914           0 :         goto out_freesbi;
     915           0 : out_no_read:
     916           0 :         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
     917             :                 __func__, s->s_id, iso_blknum, block);
     918           0 :         goto out_freesbi;
     919           0 : out_bad_zone_size:
     920           0 :         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
     921             :                 sbi->s_log_zone_size);
     922           0 :         goto out_freebh;
     923           0 : out_bad_size:
     924           0 :         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
     925             :                 orig_zonesize, opt.blocksize);
     926           0 :         goto out_freebh;
     927           0 : out_unknown_format:
     928           0 :         if (!silent)
     929           0 :                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
     930             : 
     931             : out_freebh:
     932           0 :         brelse(bh);
     933             : out_freesbi:
     934           0 :         kfree(opt.iocharset);
     935           0 :         kfree(sbi);
     936           0 :         s->s_fs_info = NULL;
     937           0 :         return error;
     938             : }
     939             : 
     940             : static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
     941             : {
     942           2 :         struct super_block *sb = dentry->d_sb;
     943           4 :         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
     944           1 : 
     945           2 :         buf->f_type = ISOFS_SUPER_MAGIC;
     946           3 :         buf->f_bsize = sb->s_blocksize;
     947           8 :         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
     948             :                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
     949           1 :         buf->f_bfree = 0;
     950           1 :         buf->f_bavail = 0;
     951           4 :         buf->f_files = ISOFS_SB(sb)->s_ninodes;
     952           1 :         buf->f_ffree = 0;
     953           1 :         buf->f_fsid.val[0] = (u32)id;
     954           1 :         buf->f_fsid.val[1] = (u32)(id >> 32);
     955           1 :         buf->f_namelen = NAME_MAX;
     956           1 :         return 0;
     957             : }
     958             : 
     959             : /*
     960             :  * Get a set of blocks; filling in buffer_heads if already allocated
     961             :  * or getblk() if they are not.  Returns the number of blocks inserted
     962             :  * (-ve == error.)
     963             :  */
     964             : int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
     965             :                      struct buffer_head **bh, unsigned long nblocks)
     966             : {
     967           4 :         unsigned long b_off;
     968           4 :         unsigned offset, sect_size;
     969           4 :         unsigned int firstext;
     970           4 :         unsigned long nextblk, nextoff;
     971           8 :         long iblock = (long)iblock_s;
     972           4 :         int section, rv, error;
     973          16 :         struct iso_inode_info *ei = ISOFS_I(inode);
     974           4 : 
     975           8 :         lock_kernel();
     976           4 : 
     977           8 :         error = -EIO;
     978           8 :         rv = 0;
     979          20 :         if (iblock < 0 || iblock != iblock_s) {
     980           8 :                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
     981           8 :                 goto abort;
     982           4 :         }
     983           4 : 
     984           8 :         b_off = iblock;
     985           4 : 
     986           4 :         offset = 0;
     987           4 :         firstext = ei->i_first_extent;
     988           8 :         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
     989           4 :         nextblk = ei->i_next_section_block;
     990           4 :         nextoff = ei->i_next_section_offset;
     991           4 :         section = 0;
     992             : 
     993          12 :         while (nblocks) {
     994           4 :                 /* If we are *way* beyond the end of the file, print a message.
     995           4 :                  * Access beyond the end of the file up to the next page boundary
     996             :                  * is normal, however because of the way the page cache works.
     997             :                  * In this case, we just return 0 so that we can properly fill
     998             :                  * the page with useless information without generating any
     999             :                  * I/O errors.
    1000             :                  */
    1001          16 :                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
    1002           8 :                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
    1003             :                                 __func__, iblock, (unsigned long) inode->i_size);
    1004           4 :                         goto abort;
    1005             :                 }
    1006             : 
    1007             :                 /* On the last section, nextblk == 0, section size is likely to
    1008             :                  * exceed sect_size by a partial block, and access beyond the
    1009             :                  * end of the file will reach beyond the section size, too.
    1010             :                  */
    1011          20 :                 while (nextblk && (b_off >= (offset + sect_size))) {
    1012           4 :                         struct inode *ninode;
    1013           4 : 
    1014           4 :                         offset += sect_size;
    1015          24 :                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
    1016          16 :                         if (IS_ERR(ninode)) {
    1017          12 :                                 error = PTR_ERR(ninode);
    1018           4 :                                 goto abort;
    1019             :                         }
    1020          12 :                         firstext  = ISOFS_I(ninode)->i_first_extent;
    1021          16 :                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
    1022          12 :                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
    1023          12 :                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
    1024           4 :                         iput(ninode);
    1025             : 
    1026          12 :                         if (++section > 100) {
    1027           4 :                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
    1028             :                                         " aborting...\n", __func__);
    1029           4 :                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
    1030             :                                         "nextblk=%lu nextoff=%lu\n", __func__,
    1031             :                                         iblock, firstext, (unsigned) sect_size,
    1032             :                                         nextblk, nextoff);
    1033           4 :                                 goto abort;
    1034             :                         }
    1035             :                 }
    1036             : 
    1037          12 :                 if (*bh) {
    1038           8 :                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
    1039             :                 } else {
    1040           8 :                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
    1041           8 :                         if (!*bh)
    1042           4 :                                 goto abort;
    1043             :                 }
    1044           8 :                 bh++;   /* Next buffer head */
    1045           8 :                 b_off++;        /* Next buffer offset */
    1046           8 :                 nblocks--;
    1047           8 :                 rv++;
    1048           8 :         }
    1049             : 
    1050           4 :         error = 0;
    1051           4 : abort:
    1052          20 :         unlock_kernel();
    1053         120 :         return rv != 0 ? rv : error;
    1054             : }
    1055             : 
    1056             : /*
    1057             :  * Used by the standard interfaces.
    1058             :  */
    1059             : static int isofs_get_block(struct inode *inode, sector_t iblock,
    1060             :                     struct buffer_head *bh_result, int create)
    1061             : {
    1062           4 :         int ret;
    1063             : 
    1064           8 :         if (create) {
    1065           4 :                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
    1066           4 :                 return -EROFS;
    1067             :         }
    1068             : 
    1069          24 :         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
    1070          24 :         return ret < 0 ? ret : 0;
    1071             : }
    1072             : 
    1073             : static int isofs_bmap(struct inode *inode, sector_t block)
    1074             : {
    1075           4 :         struct buffer_head dummy;
    1076           4 :         int error;
    1077             : 
    1078           4 :         dummy.b_state = 0;
    1079           4 :         dummy.b_blocknr = -1000;
    1080          12 :         error = isofs_get_block(inode, block, &dummy, 0);
    1081           8 :         if (!error)
    1082           4 :                 return dummy.b_blocknr;
    1083           4 :         return 0;
    1084             : }
    1085             : 
    1086             : struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
    1087             : {
    1088          16 :         sector_t blknr = isofs_bmap(inode, block);
    1089          12 :         if (!blknr)
    1090           8 :                 return NULL;
    1091          12 :         return sb_bread(inode->i_sb, blknr);
    1092             : }
    1093             : 
    1094             : static int isofs_readpage(struct file *file, struct page *page)
    1095             : {
    1096           0 :         return block_read_full_page(page,isofs_get_block);
    1097             : }
    1098             : 
    1099             : static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
    1100             : {
    1101           3 :         return generic_block_bmap(mapping,block,isofs_get_block);
    1102             : }
    1103             : 
    1104           1 : static const struct address_space_operations isofs_aops = {
    1105             :         .readpage = isofs_readpage,
    1106             :         .sync_page = block_sync_page,
    1107             :         .bmap = _isofs_bmap
    1108             : };
    1109             : 
    1110             : static int isofs_read_level3_size(struct inode *inode)
    1111             : {
    1112          16 :         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
    1113          40 :         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
    1114          16 :         struct buffer_head *bh = NULL;
    1115           8 :         unsigned long block, offset, block_saved, offset_saved;
    1116          16 :         int i = 0;
    1117          16 :         int more_entries = 0;
    1118          16 :         struct iso_directory_record *tmpde = NULL;
    1119          32 :         struct iso_inode_info *ei = ISOFS_I(inode);
    1120           8 : 
    1121          16 :         inode->i_size = 0;
    1122           8 : 
    1123           8 :         /* The first 16 blocks are reserved as the System Area.  Thus,
    1124           8 :          * no inodes can appear in block 0.  We use this to flag that
    1125           8 :          * this is the last section. */
    1126          16 :         ei->i_next_section_block = 0;
    1127          16 :         ei->i_next_section_offset = 0;
    1128           8 : 
    1129          16 :         block = ei->i_iget5_block;
    1130           8 :         offset = ei->i_iget5_offset;
    1131             : 
    1132           8 :         do {
    1133             :                 struct iso_directory_record *de;
    1134             :                 unsigned int de_len;
    1135             : 
    1136          16 :                 if (!bh) {
    1137          16 :                         bh = sb_bread(inode->i_sb, block);
    1138          16 :                         if (!bh)
    1139           8 :                                 goto out_noread;
    1140             :                 }
    1141          16 :                 de = (struct iso_directory_record *) (bh->b_data + offset);
    1142          16 :                 de_len = *(unsigned char *) de;
    1143             : 
    1144          32 :                 if (de_len == 0) {
    1145          32 :                         brelse(bh);
    1146           8 :                         bh = NULL;
    1147           8 :                         ++block;
    1148           8 :                         offset = 0;
    1149           8 :                         continue;
    1150             :                 }
    1151             : 
    1152          16 :                 block_saved = block;
    1153          16 :                 offset_saved = offset;
    1154          16 :                 offset += de_len;
    1155             : 
    1156             :                 /* Make sure we have a full directory entry */
    1157          32 :                 if (offset >= bufsize) {
    1158          16 :                         int slop = bufsize - offset + de_len;
    1159          32 :                         if (!tmpde) {
    1160          40 :                                 tmpde = kmalloc(256, GFP_KERNEL);
    1161          16 :                                 if (!tmpde)
    1162           8 :                                         goto out_nomem;
    1163             :                         }
    1164          24 :                         memcpy(tmpde, de, slop);
    1165          24 :                         offset &= bufsize - 1;
    1166          24 :                         block++;
    1167          48 :                         brelse(bh);
    1168           8 :                         bh = NULL;
    1169          16 :                         if (offset) {
    1170          16 :                                 bh = sb_bread(inode->i_sb, block);
    1171          16 :                                 if (!bh)
    1172           8 :                                         goto out_noread;
    1173          16 :                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
    1174             :                         }
    1175          16 :                         de = tmpde;
    1176             :                 }
    1177             : 
    1178          72 :                 inode->i_size += isonum_733(de->size);
    1179          16 :                 if (i == 1) {
    1180           8 :                         ei->i_next_section_block = block_saved;
    1181           8 :                         ei->i_next_section_offset = offset_saved;
    1182             :                 }
    1183             : 
    1184           8 :                 more_entries = de->flags[-high_sierra] & 0x80;
    1185             : 
    1186           8 :                 i++;
    1187          16 :                 if (i > 100)
    1188           8 :                         goto out_toomany;
    1189          32 :         } while (more_entries);
    1190             : out:
    1191          32 :         kfree(tmpde);
    1192          40 :         if (bh)
    1193          32 :                 brelse(bh);
    1194          24 :         return 0;
    1195           8 : 
    1196          16 : out_nomem:
    1197          16 :         if (bh)
    1198          16 :                 brelse(bh);
    1199          16 :         return -ENOMEM;
    1200          16 : 
    1201             : out_noread:
    1202          16 :         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
    1203          16 :         kfree(tmpde);
    1204          16 :         return -EIO;
    1205           8 : 
    1206             : out_toomany:
    1207           8 :         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
    1208             :                 "isofs_read_level3_size: inode=%lu\n",
    1209             :                 __func__, inode->i_ino);
    1210           8 :         goto out;
    1211             : }
    1212             : 
    1213             : static int isofs_read_inode(struct inode *inode)
    1214             : {
    1215          16 :         struct super_block *sb = inode->i_sb;
    1216          32 :         struct isofs_sb_info *sbi = ISOFS_SB(sb);
    1217          16 :         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
    1218           8 :         unsigned long block;
    1219          24 :         int high_sierra = sbi->s_high_sierra;
    1220          16 :         struct buffer_head *bh = NULL;
    1221           8 :         struct iso_directory_record *de;
    1222          16 :         struct iso_directory_record *tmpde = NULL;
    1223           8 :         unsigned int de_len;
    1224           8 :         unsigned long offset;
    1225          32 :         struct iso_inode_info *ei = ISOFS_I(inode);
    1226          16 :         int ret = -EIO;
    1227           8 : 
    1228          16 :         block = ei->i_iget5_block;
    1229          24 :         bh = sb_bread(inode->i_sb, block);
    1230          24 :         if (!bh)
    1231          16 :                 goto out_badread;
    1232           8 : 
    1233          16 :         offset = ei->i_iget5_offset;
    1234           8 : 
    1235          16 :         de = (struct iso_directory_record *) (bh->b_data + offset);
    1236          16 :         de_len = *(unsigned char *) de;
    1237           8 : 
    1238          24 :         if (offset + de_len > bufsize) {
    1239          16 :                 int frag1 = bufsize - offset;
    1240             : 
    1241          24 :                 tmpde = kmalloc(de_len, GFP_KERNEL);
    1242          16 :                 if (tmpde == NULL) {
    1243           8 :                         printk(KERN_INFO "%s: out of memory\n", __func__);
    1244           8 :                         ret = -ENOMEM;
    1245           8 :                         goto fail;
    1246             :                 }
    1247           8 :                 memcpy(tmpde, bh->b_data + offset, frag1);
    1248          16 :                 brelse(bh);
    1249          24 :                 bh = sb_bread(inode->i_sb, ++block);
    1250          16 :                 if (!bh)
    1251           8 :                         goto out_badread;
    1252          16 :                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
    1253           8 :                 de = tmpde;
    1254             :         }
    1255             : 
    1256          48 :         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
    1257             :                                         ei->i_iget5_offset,
    1258             :                                         ISOFS_BUFFER_BITS(inode));
    1259             : 
    1260             :         /* Assume it is a normal-format file unless told otherwise */
    1261           8 :         ei->i_file_format = isofs_file_normal;
    1262             : 
    1263          16 :         if (de->flags[-high_sierra] & 2) {
    1264          16 :                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
    1265          16 :                         inode->i_mode = S_IFDIR | sbi->s_dmode;
    1266             :                 else
    1267           8 :                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
    1268           8 :                 inode->i_nlink = 1;  /*
    1269             :                                          * Set to 1.  We know there are 2, but
    1270             :                                          * the find utility tries to optimize
    1271             :                                          * if it is 2, and it screws up.  It is
    1272             :                                          * easier to give 1 which tells find to
    1273             :                                          * do it the hard way.
    1274             :                                          */
    1275             :         } else {
    1276          16 :                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
    1277          16 :                         inode->i_mode = S_IFREG | sbi->s_fmode;
    1278             :                 } else {
    1279             :                         /*
    1280             :                          * Set default permissions: r-x for all.  The disc
    1281             :                          * could be shared with DOS machines so virtually
    1282             :                          * anything could be a valid executable.
    1283             :                          */
    1284           8 :                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
    1285             :                 }
    1286           8 :                 inode->i_nlink = 1;
    1287             :         }
    1288           8 :         inode->i_uid = sbi->s_uid;
    1289           8 :         inode->i_gid = sbi->s_gid;
    1290           8 :         inode->i_blocks = 0;
    1291             : 
    1292           8 :         ei->i_format_parm[0] = 0;
    1293           8 :         ei->i_format_parm[1] = 0;
    1294           8 :         ei->i_format_parm[2] = 0;
    1295             : 
    1296          24 :         ei->i_section_size = isonum_733(de->size);
    1297          16 :         if (de->flags[-high_sierra] & 0x80) {
    1298          64 :                 ret = isofs_read_level3_size(inode);
    1299          16 :                 if (ret < 0)
    1300           8 :                         goto fail;
    1301           8 :                 ret = -EIO;
    1302             :         } else {
    1303           8 :                 ei->i_next_section_block = 0;
    1304           8 :                 ei->i_next_section_offset = 0;
    1305          24 :                 inode->i_size = isonum_733(de->size);
    1306             :         }
    1307             : 
    1308             :         /*
    1309             :          * Some dipshit decided to store some other bit of information
    1310             :          * in the high byte of the file length.  Truncate size in case
    1311             :          * this CDROM was mounted with the cruft option.
    1312             :          */
    1313             : 
    1314          32 :         if (sbi->s_cruft)
    1315          16 :                 inode->i_size &= 0x00ffffff;
    1316             : 
    1317          32 :         if (de->interleave[0]) {
    1318          16 :                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
    1319          16 :                 inode->i_size = 0;
    1320             :         }
    1321             : 
    1322             :         /* I have no idea what file_unit_size is used for, so
    1323             :            we will flag it for now */
    1324          32 :         if (de->file_unit_size[0] != 0) {
    1325          16 :                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
    1326             :                         inode->i_ino);
    1327             :         }
    1328             : 
    1329             :         /* I have no idea what other flag bits are used for, so
    1330             :            we will flag it for now */
    1331             : #ifdef DEBUG
    1332             :         if((de->flags[-high_sierra] & ~2)!= 0){
    1333             :                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
    1334             :                                 "(%ld %x).\n",
    1335             :                         inode->i_ino, de->flags[-high_sierra]);
    1336             :         }
    1337             : #endif
    1338             : 
    1339          88 :         inode->i_mtime.tv_sec =
    1340             :         inode->i_atime.tv_sec =
    1341             :         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
    1342          40 :         inode->i_mtime.tv_nsec =
    1343             :         inode->i_atime.tv_nsec =
    1344             :         inode->i_ctime.tv_nsec = 0;
    1345             : 
    1346          40 :         ei->i_first_extent = (isonum_733(de->extent) +
    1347             :                         isonum_711(de->ext_attr_length));
    1348             : 
    1349             :         /* Set the number of blocks for stat() - should be done before RR */
    1350           8 :         inode->i_blocks = (inode->i_size + 511) >> 9;
    1351             : 
    1352             :         /*
    1353             :          * Now test for possible Rock Ridge extensions which will override
    1354             :          * some of these numbers in the inode structure.
    1355             :          */
    1356             : 
    1357          16 :         if (!high_sierra) {
    1358          32 :                 parse_rock_ridge_inode(de, inode);
    1359             :                 /* if we want uid/gid set, override the rock ridge setting */
    1360          16 :                 if (sbi->s_uid_set)
    1361           8 :                         inode->i_uid = sbi->s_uid;
    1362          16 :                 if (sbi->s_gid_set)
    1363           8 :                         inode->i_gid = sbi->s_gid;
    1364             :         }
    1365             :         /* Now set final access rights if overriding rock ridge setting */
    1366         112 :         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
    1367             :             sbi->s_dmode != ISOFS_INVALID_MODE)
    1368          32 :                 inode->i_mode = S_IFDIR | sbi->s_dmode;
    1369         112 :         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
    1370             :             sbi->s_fmode != ISOFS_INVALID_MODE)
    1371          32 :                 inode->i_mode = S_IFREG | sbi->s_fmode;
    1372             : 
    1373             :         /* Install the inode operations vector */
    1374          48 :         if (S_ISREG(inode->i_mode)) {
    1375          16 :                 inode->i_fop = &generic_ro_fops;
    1376             :                 switch (ei->i_file_format) {
    1377             : #ifdef CONFIG_ZISOFS
    1378             :                 case isofs_file_compressed:
    1379             :                         inode->i_data.a_ops = &zisofs_aops;
    1380             :                         break;
    1381             : #endif
    1382          16 :                 default:
    1383          32 :                         inode->i_data.a_ops = &isofs_aops;
    1384          16 :                         break;
    1385             :                 }
    1386          48 :         } else if (S_ISDIR(inode->i_mode)) {
    1387          16 :                 inode->i_op = &isofs_dir_inode_operations;
    1388          16 :                 inode->i_fop = &isofs_dir_operations;
    1389          48 :         } else if (S_ISLNK(inode->i_mode)) {
    1390          16 :                 inode->i_op = &page_symlink_inode_operations;
    1391          16 :                 inode->i_data.a_ops = &isofs_symlink_aops;
    1392             :         } else
    1393             :                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
    1394          32 :                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
    1395             : 
    1396          16 :         ret = 0;
    1397          16 : out:
    1398          48 :         kfree(tmpde);
    1399          96 :         if (bh)
    1400          96 :                 brelse(bh);
    1401          56 :         return ret;
    1402          16 : 
    1403             : out_badread:
    1404          16 :         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
    1405             : fail:
    1406          48 :         goto out;
    1407             : }
    1408           1 : 
    1409             : struct isofs_iget5_callback_data {
    1410             :         unsigned long block;
    1411             :         unsigned long offset;
    1412             : };
    1413             : 
    1414             : static int isofs_iget5_test(struct inode *ino, void *data)
    1415             : {
    1416           0 :         struct iso_inode_info *i = ISOFS_I(ino);
    1417           0 :         struct isofs_iget5_callback_data *d =
    1418           0 :                 (struct isofs_iget5_callback_data*)data;
    1419           0 :         return (i->i_iget5_block == d->block)
    1420             :                 && (i->i_iget5_offset == d->offset);
    1421             : }
    1422             : 
    1423             : static int isofs_iget5_set(struct inode *ino, void *data)
    1424             : {
    1425           0 :         struct iso_inode_info *i = ISOFS_I(ino);
    1426           0 :         struct isofs_iget5_callback_data *d =
    1427           0 :                 (struct isofs_iget5_callback_data*)data;
    1428           0 :         i->i_iget5_block = d->block;
    1429           0 :         i->i_iget5_offset = d->offset;
    1430           0 :         return 0;
    1431             : }
    1432             : 
    1433             : /* Store, in the inode's containing structure, the block and block
    1434             :  * offset that point to the underlying meta-data for the inode.  The
    1435             :  * code below is otherwise similar to the iget() code in
    1436             :  * include/linux/fs.h */
    1437             : struct inode *isofs_iget(struct super_block *sb,
    1438             :                          unsigned long block,
    1439           8 :                          unsigned long offset)
    1440           8 : {
    1441           8 :         unsigned long hashval;
    1442           8 :         struct inode *inode;
    1443           8 :         struct isofs_iget5_callback_data data;
    1444           8 :         long ret;
    1445           8 : 
    1446          32 :         if (offset >= 1ul << sb->s_blocksize_bits)
    1447          24 :                 return ERR_PTR(-EINVAL);
    1448             : 
    1449           8 :         data.block = block;
    1450           8 :         data.offset = offset;
    1451             : 
    1452          16 :         hashval = (block << sb->s_blocksize_bits) | offset;
    1453             : 
    1454           8 :         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
    1455             :                                 &isofs_iget5_set, &data);
    1456             : 
    1457          16 :         if (!inode)
    1458          24 :                 return ERR_PTR(-ENOMEM);
    1459             : 
    1460          16 :         if (inode->i_state & I_NEW) {
    1461          72 :                 ret = isofs_read_inode(inode);
    1462          16 :                 if (ret < 0) {
    1463           8 :                         iget_failed(inode);
    1464          24 :                         inode = ERR_PTR(ret);
    1465             :                 } else {
    1466           8 :                         unlock_new_inode(inode);
    1467             :                 }
    1468             :         }
    1469             : 
    1470          24 :         return inode;
    1471             : }
    1472             : 
    1473             : static int isofs_get_sb(struct file_system_type *fs_type,
    1474             :         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
    1475             : {
    1476           3 :         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
    1477             :                                 mnt);
    1478             : }
    1479             : 
    1480           1 : static struct file_system_type iso9660_fs_type = {
    1481             :         .owner          = THIS_MODULE,
    1482             :         .name           = "iso9660",
    1483             :         .get_sb         = isofs_get_sb,
    1484             :         .kill_sb        = kill_block_super,
    1485             :         .fs_flags       = FS_REQUIRES_DEV,
    1486             : };
    1487             : 
    1488             : static int __init init_iso9660_fs(void)
    1489             : {
    1490           4 :         int err = init_inodecache();
    1491           3 :         if (err)
    1492           1 :                 goto out;
    1493             : #ifdef CONFIG_ZISOFS
    1494             :         err = zisofs_init();
    1495             :         if (err)
    1496             :                 goto out1;
    1497             : #endif
    1498           2 :         err = register_filesystem(&iso9660_fs_type);
    1499           2 :         if (err)
    1500           1 :                 goto out2;
    1501           1 :         return 0;
    1502           1 : out2:
    1503             : #ifdef CONFIG_ZISOFS
    1504             :         zisofs_cleanup();
    1505             : out1:
    1506             : #endif
    1507           2 :         destroy_inodecache();
    1508             : out:
    1509           3 :         return err;
    1510             : }
    1511             : 
    1512             : static void __exit exit_iso9660_fs(void)
    1513             : {
    1514           4 :         unregister_filesystem(&iso9660_fs_type);
    1515             : #ifdef CONFIG_ZISOFS
    1516             :         zisofs_cleanup();
    1517             : #endif
    1518           4 :         destroy_inodecache();
    1519           2 : }
    1520             : 
    1521             : module_init(init_iso9660_fs)
    1522             : module_exit(exit_iso9660_fs)
    1523           1 : MODULE_LICENSE("GPL");
    1524             : /* Actual filesystem name is iso9660, as requested in filesystems.c */
    1525             : MODULE_ALIAS("iso9660");

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