inode.c
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上传日期:2013-02-24
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文件大小:37k
- /*
- * linux/fs/isofs/inode.c
- *
- * (C) 1991 Linus Torvalds - minix filesystem
- * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
- * 1994 Eberhard Moenkeberg - multi session handling.
- * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
- * 1997 Gordon Chaffee - Joliet CDs
- * 1998 Eric Lammerts - ISO 9660 Level 3
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/stat.h>
- #include <linux/sched.h>
- #include <linux/iso_fs.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/mm.h>
- #include <linux/string.h>
- #include <linux/locks.h>
- #include <linux/slab.h>
- #include <linux/errno.h>
- #include <linux/cdrom.h>
- #include <linux/init.h>
- #include <linux/nls.h>
- #include <linux/ctype.h>
- #include <linux/smp_lock.h>
- #include <linux/blkdev.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include "zisofs.h"
- /*
- * We have no support for "multi volume" CDs, but more and more disks carry
- * wrong information within the volume descriptors.
- */
- #define IGNORE_WRONG_MULTI_VOLUME_SPECS
- #define BEQUIET
- #ifdef LEAK_CHECK
- static int check_malloc = 0;
- static int check_bread = 0;
- #endif
- static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
- static int isofs_hash(struct dentry *parent, struct qstr *qstr);
- static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
- static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
- #ifdef CONFIG_JOLIET
- static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
- static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
- static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
- static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
- #endif
- static void isofs_put_super(struct super_block *sb)
- {
- #ifdef CONFIG_JOLIET
- if (sb->u.isofs_sb.s_nls_iocharset) {
- unload_nls(sb->u.isofs_sb.s_nls_iocharset);
- sb->u.isofs_sb.s_nls_iocharset = NULL;
- }
- #endif
- #ifdef LEAK_CHECK
- printk("Outstanding mallocs:%d, outstanding buffers: %dn",
- check_malloc, check_bread);
- #endif
- return;
- }
- static void isofs_read_inode(struct inode *);
- static int isofs_statfs (struct super_block *, struct statfs *);
- static struct super_operations isofs_sops = {
- read_inode: isofs_read_inode,
- put_super: isofs_put_super,
- statfs: isofs_statfs,
- };
- static struct dentry_operations isofs_dentry_ops[] = {
- {
- d_hash: isofs_hash,
- d_compare: isofs_dentry_cmp,
- },
- {
- d_hash: isofs_hashi,
- d_compare: isofs_dentry_cmpi,
- },
- #ifdef CONFIG_JOLIET
- {
- d_hash: isofs_hash_ms,
- d_compare: isofs_dentry_cmp_ms,
- },
- {
- d_hash: isofs_hashi_ms,
- d_compare: isofs_dentry_cmpi_ms,
- }
- #endif
- };
- struct iso9660_options{
- char map;
- char rock;
- char joliet;
- char cruft;
- char unhide;
- char nocompress;
- unsigned char check;
- unsigned int blocksize;
- mode_t mode;
- gid_t gid;
- uid_t uid;
- char *iocharset;
- unsigned char utf8;
- /* LVE */
- s32 session;
- s32 sbsector;
- };
- /*
- * Compute the hash for the isofs name corresponding to the dentry.
- */
- static int
- isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
- {
- const char *name;
- int len;
- len = qstr->len;
- name = qstr->name;
- if (ms) {
- while (len && name[len-1] == '.')
- len--;
- }
- qstr->hash = full_name_hash(name, len);
- return 0;
- }
- /*
- * Compute the hash for the isofs name corresponding to the dentry.
- */
- static int
- isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
- {
- const char *name;
- int len;
- char c;
- unsigned long hash;
- len = qstr->len;
- name = qstr->name;
- if (ms) {
- while (len && name[len-1] == '.')
- len--;
- }
- hash = init_name_hash();
- while (len--) {
- c = tolower(*name++);
- hash = partial_name_hash(tolower(c), hash);
- }
- qstr->hash = end_name_hash(hash);
- return 0;
- }
- /*
- * Case insensitive compare of two isofs names.
- */
- static int
- isofs_dentry_cmpi_common(struct dentry *dentry,struct qstr *a,struct qstr *b,int ms)
- {
- int alen, blen;
- /* A filename cannot end in '.' or we treat it like it has none */
- alen = a->len;
- blen = b->len;
- if (ms) {
- while (alen && a->name[alen-1] == '.')
- alen--;
- while (blen && b->name[blen-1] == '.')
- blen--;
- }
- if (alen == blen) {
- if (strnicmp(a->name, b->name, alen) == 0)
- return 0;
- }
- return 1;
- }
- /*
- * Case sensitive compare of two isofs names.
- */
- static int
- isofs_dentry_cmp_common(struct dentry *dentry,struct qstr *a,struct qstr *b,int ms)
- {
- int alen, blen;
- /* A filename cannot end in '.' or we treat it like it has none */
- alen = a->len;
- blen = b->len;
- if (ms) {
- while (alen && a->name[alen-1] == '.')
- alen--;
- while (blen && b->name[blen-1] == '.')
- blen--;
- }
- if (alen == blen) {
- if (strncmp(a->name, b->name, alen) == 0)
- return 0;
- }
- return 1;
- }
- static int
- isofs_hash(struct dentry *dentry, struct qstr *qstr)
- {
- return isofs_hash_common(dentry, qstr, 0);
- }
- static int
- isofs_hashi(struct dentry *dentry, struct qstr *qstr)
- {
- return isofs_hashi_common(dentry, qstr, 0);
- }
- static int
- isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
- {
- return isofs_dentry_cmp_common(dentry, a, b, 0);
- }
- static int
- isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
- {
- return isofs_dentry_cmpi_common(dentry, a, b, 0);
- }
- #ifdef CONFIG_JOLIET
- static int
- isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
- {
- return isofs_hash_common(dentry, qstr, 1);
- }
- static int
- isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
- {
- return isofs_hashi_common(dentry, qstr, 1);
- }
- static int
- isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
- {
- return isofs_dentry_cmp_common(dentry, a, b, 1);
- }
- static int
- isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
- {
- return isofs_dentry_cmpi_common(dentry, a, b, 1);
- }
- #endif
- static int parse_options(char *options, struct iso9660_options * popt)
- {
- char *this_char,*value;
- popt->map = 'n';
- popt->rock = 'y';
- popt->joliet = 'y';
- popt->cruft = 'n';
- popt->unhide = 'n';
- popt->check = 'u'; /* unset */
- popt->nocompress = 0;
- popt->blocksize = 1024;
- popt->mode = S_IRUGO | S_IXUGO; /* r-x for all. The disc could
- be shared with DOS machines so
- virtually anything could be
- a valid executable. */
- popt->gid = 0;
- popt->uid = 0;
- popt->iocharset = NULL;
- popt->utf8 = 0;
- popt->session=-1;
- popt->sbsector=-1;
- if (!options) return 1;
- for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
- if (strncmp(this_char,"norock",6) == 0) {
- popt->rock = 'n';
- continue;
- }
- if (strncmp(this_char,"nojoliet",8) == 0) {
- popt->joliet = 'n';
- continue;
- }
- if (strncmp(this_char,"unhide",6) == 0) {
- popt->unhide = 'y';
- continue;
- }
- if (strncmp(this_char,"cruft",5) == 0) {
- popt->cruft = 'y';
- continue;
- }
- if (strncmp(this_char,"utf8",4) == 0) {
- popt->utf8 = 1;
- continue;
- }
- if (strncmp(this_char,"nocompress",10) == 0) {
- popt->nocompress = 1;
- continue;
- }
- if ((value = strchr(this_char,'=')) != NULL)
- *value++ = 0;
- #ifdef CONFIG_JOLIET
- if (!strcmp(this_char,"iocharset") && value) {
- popt->iocharset = value;
- while (*value && *value != ',')
- value++;
- if (value == popt->iocharset)
- return 0;
- *value = 0;
- } else
- #endif
- if (!strcmp(this_char,"map") && value) {
- if (value[0] && !value[1] && strchr("ano",*value))
- popt->map = *value;
- else if (!strcmp(value,"off")) popt->map = 'o';
- else if (!strcmp(value,"normal")) popt->map = 'n';
- else if (!strcmp(value,"acorn")) popt->map = 'a';
- else return 0;
- }
- if (!strcmp(this_char,"session") && value) {
- char * vpnt = value;
- unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
- if(ivalue < 0 || ivalue >99) return 0;
- popt->session=ivalue+1;
- }
- if (!strcmp(this_char,"sbsector") && value) {
- char * vpnt = value;
- unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
- if(ivalue < 0 || ivalue >660*512) return 0;
- popt->sbsector=ivalue;
- }
- else if (!strcmp(this_char,"check") && value) {
- if (value[0] && !value[1] && strchr("rs",*value))
- popt->check = *value;
- else if (!strcmp(value,"relaxed")) popt->check = 'r';
- else if (!strcmp(value,"strict")) popt->check = 's';
- else return 0;
- }
- else if (!strcmp(this_char,"conv") && value) {
- /* no conversion is done anymore;
- we still accept the same mount options,
- but ignore them */
- if (value[0] && !value[1] && strchr("btma",*value)) ;
- else if (!strcmp(value,"binary")) ;
- else if (!strcmp(value,"text")) ;
- else if (!strcmp(value,"mtext")) ;
- else if (!strcmp(value,"auto")) ;
- else return 0;
- }
- else if (value &&
- (!strcmp(this_char,"block") ||
- !strcmp(this_char,"mode") ||
- !strcmp(this_char,"uid") ||
- !strcmp(this_char,"gid"))) {
- char * vpnt = value;
- unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
- if (*vpnt) return 0;
- switch(*this_char) {
- case 'b':
- if ( ivalue != 512
- && ivalue != 1024
- && ivalue != 2048) return 0;
- popt->blocksize = ivalue;
- break;
- case 'u':
- popt->uid = ivalue;
- break;
- case 'g':
- popt->gid = ivalue;
- break;
- case 'm':
- popt->mode = ivalue;
- break;
- }
- }
- else return 1;
- }
- return 1;
- }
- /*
- * look if the driver can tell the multi session redirection value
- *
- * don't change this if you don't know what you do, please!
- * Multisession is legal only with XA disks.
- * A non-XA disk with more than one volume descriptor may do it right, but
- * usually is written in a nowhere standardized "multi-partition" manner.
- * Multisession uses absolute addressing (solely the first frame of the whole
- * track is #0), multi-partition uses relative addressing (each first frame of
- * each track is #0), and a track is not a session.
- *
- * A broken CDwriter software or drive firmware does not set new standards,
- * at least not if conflicting with the existing ones.
- *
- * emoenke@gwdg.de
- */
- #define WE_OBEY_THE_WRITTEN_STANDARDS 1
- static unsigned int isofs_get_last_session(struct super_block *sb,s32 session )
- {
- struct cdrom_multisession ms_info;
- unsigned int vol_desc_start;
- struct block_device *bdev = sb->s_bdev;
- int i;
- vol_desc_start=0;
- ms_info.addr_format=CDROM_LBA;
- if(session >= 0 && session <= 99) {
- struct cdrom_tocentry Te;
- Te.cdte_track=session;
- Te.cdte_format=CDROM_LBA;
- i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
- if (!i) {
- printk(KERN_DEBUG "Session %d start %d type %dn",
- session, Te.cdte_addr.lba,
- Te.cdte_ctrl&CDROM_DATA_TRACK);
- if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
- return Te.cdte_addr.lba;
- }
-
- printk(KERN_ERR "Invalid session number or type of trackn");
- }
- i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
- if(session > 0) printk(KERN_ERR "Invalid session numbern");
- #if 0
- printk("isofs.inode: CDROMMULTISESSION: rc=%dn",i);
- if (i==0) {
- printk("isofs.inode: XA disk: %sn",ms_info.xa_flag?"yes":"no");
- printk("isofs.inode: vol_desc_start = %dn", ms_info.addr.lba);
- }
- #endif
- if (i==0)
- #if WE_OBEY_THE_WRITTEN_STANDARDS
- if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
- #endif
- vol_desc_start=ms_info.addr.lba;
- return vol_desc_start;
- }
- /*
- * Initialize the superblock and read the root inode.
- *
- * Note: a check_disk_change() has been done immediately prior
- * to this call, so we don't need to check again.
- */
- static struct super_block *isofs_read_super(struct super_block *s, void *data,
- int silent)
- {
- kdev_t dev = s->s_dev;
- struct buffer_head * bh = NULL, *pri_bh = NULL;
- struct hs_primary_descriptor * h_pri = NULL;
- struct iso_primary_descriptor * pri = NULL;
- struct iso_supplementary_descriptor *sec = NULL;
- struct iso_directory_record * rootp;
- int joliet_level = 0;
- int high_sierra;
- int iso_blknum, block;
- int orig_zonesize;
- int table;
- unsigned int blocksize, blocksize_bits;
- unsigned int vol_desc_start;
- unsigned long first_data_zone;
- struct inode * inode;
- struct iso9660_options opt;
- if (!parse_options((char *) data, &opt))
- goto out_unlock;
- #if 0
- printk("map = %cn", opt.map);
- printk("rock = %cn", opt.rock);
- printk("joliet = %cn", opt.joliet);
- printk("check = %cn", opt.check);
- printk("cruft = %cn", opt.cruft);
- printk("unhide = %cn", opt.unhide);
- printk("blocksize = %dn", opt.blocksize);
- printk("gid = %dn", opt.gid);
- printk("uid = %dn", opt.uid);
- printk("iocharset = %sn", opt.iocharset);
- #endif
- /*
- * First of all, get the hardware blocksize for this device.
- * If we don't know what it is, or the hardware blocksize is
- * larger than the blocksize the user specified, then use
- * that value.
- */
- blocksize = get_hardsect_size(dev);
- if(blocksize > opt.blocksize) {
- /*
- * Force the blocksize we are going to use to be the
- * hardware blocksize.
- */
- opt.blocksize = blocksize;
- }
- blocksize_bits = 0;
- {
- int i = opt.blocksize;
- while (i != 1){
- blocksize_bits++;
- i >>=1;
- }
- }
- set_blocksize(dev, opt.blocksize);
- s->s_blocksize = opt.blocksize;
- s->u.isofs_sb.s_high_sierra = high_sierra = 0; /* default is iso9660 */
- vol_desc_start = (opt.sbsector != -1) ?
- opt.sbsector : isofs_get_last_session(s,opt.session);
- for (iso_blknum = vol_desc_start+16;
- iso_blknum < vol_desc_start+100; iso_blknum++)
- {
- struct hs_volume_descriptor * hdp;
- struct iso_volume_descriptor * vdp;
- block = iso_blknum << (ISOFS_BLOCK_BITS-blocksize_bits);
- if (!(bh = sb_bread(s, block)))
- goto out_no_read;
- vdp = (struct iso_volume_descriptor *)bh->b_data;
- hdp = (struct hs_volume_descriptor *)bh->b_data;
-
- /* Due to the overlapping physical location of the descriptors,
- * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
- * proper identification in this case, we first check for ISO.
- */
- if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
- if (isonum_711 (vdp->type) == ISO_VD_END)
- break;
- if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) {
- if (pri == NULL) {
- pri = (struct iso_primary_descriptor *)vdp;
- /* Save the buffer in case we need it ... */
- pri_bh = bh;
- bh = NULL;
- }
- }
- #ifdef CONFIG_JOLIET
- else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) {
- sec = (struct iso_supplementary_descriptor *)vdp;
- if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
- if (opt.joliet == 'y') {
- if (sec->escape[2] == 0x40) {
- joliet_level = 1;
- } else if (sec->escape[2] == 0x43) {
- joliet_level = 2;
- } else if (sec->escape[2] == 0x45) {
- joliet_level = 3;
- }
- printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %dn",
- joliet_level);
- }
- goto root_found;
- } else {
- /* Unknown supplementary volume descriptor */
- sec = NULL;
- }
- }
- #endif
- } else {
- if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
- if (isonum_711 (hdp->type) != ISO_VD_PRIMARY)
- goto out_freebh;
-
- s->u.isofs_sb.s_high_sierra = 1;
- high_sierra = 1;
- opt.rock = 'n';
- h_pri = (struct hs_primary_descriptor *)vdp;
- goto root_found;
- }
- }
- /* Just skip any volume descriptors we don't recognize */
- brelse(bh);
- bh = NULL;
- }
- /*
- * If we fall through, either no volume descriptor was found,
- * or else we passed a primary descriptor looking for others.
- */
- if (!pri)
- goto out_unknown_format;
- brelse(bh);
- bh = pri_bh;
- pri_bh = NULL;
- root_found:
- if (joliet_level && (pri == NULL || opt.rock == 'n')) {
- /* This is the case of Joliet with the norock mount flag.
- * A disc with both Joliet and Rock Ridge is handled later
- */
- pri = (struct iso_primary_descriptor *) sec;
- }
- if(high_sierra){
- rootp = (struct iso_directory_record *) h_pri->root_directory_record;
- #ifndef IGNORE_WRONG_MULTI_VOLUME_SPECS
- if (isonum_723 (h_pri->volume_set_size) != 1)
- goto out_no_support;
- #endif /* IGNORE_WRONG_MULTI_VOLUME_SPECS */
- s->u.isofs_sb.s_nzones = isonum_733 (h_pri->volume_space_size);
- s->u.isofs_sb.s_log_zone_size = isonum_723 (h_pri->logical_block_size);
- s->u.isofs_sb.s_max_size = isonum_733(h_pri->volume_space_size);
- } else {
- rootp = (struct iso_directory_record *) pri->root_directory_record;
- #ifndef IGNORE_WRONG_MULTI_VOLUME_SPECS
- if (isonum_723 (pri->volume_set_size) != 1)
- goto out_no_support;
- #endif /* IGNORE_WRONG_MULTI_VOLUME_SPECS */
- s->u.isofs_sb.s_nzones = isonum_733 (pri->volume_space_size);
- s->u.isofs_sb.s_log_zone_size = isonum_723 (pri->logical_block_size);
- s->u.isofs_sb.s_max_size = isonum_733(pri->volume_space_size);
- }
- s->u.isofs_sb.s_ninodes = 0; /* No way to figure this out easily */
- orig_zonesize = s -> u.isofs_sb.s_log_zone_size;
- /*
- * If the zone size is smaller than the hardware sector size,
- * this is a fatal error. This would occur if the disc drive
- * had sectors that were 2048 bytes, but the filesystem had
- * blocks that were 512 bytes (which should only very rarely
- * happen.)
- */
- if(blocksize != 0 && orig_zonesize < blocksize)
- goto out_bad_size;
- /* RDE: convert log zone size to bit shift */
- switch (s -> u.isofs_sb.s_log_zone_size)
- { case 512: s -> u.isofs_sb.s_log_zone_size = 9; break;
- case 1024: s -> u.isofs_sb.s_log_zone_size = 10; break;
- case 2048: s -> u.isofs_sb.s_log_zone_size = 11; break;
- default:
- goto out_bad_zone_size;
- }
- s->s_magic = ISOFS_SUPER_MAGIC;
- /* The CDROM is read-only, has no nodes (devices) on it, and since
- all of the files appear to be owned by root, we really do not want
- to allow suid. (suid or devices will not show up unless we have
- Rock Ridge extensions) */
- s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
- /* Set this for reference. Its not currently used except on write
- which we don't have .. */
-
- /* RDE: data zone now byte offset! */
- first_data_zone = ((isonum_733 (rootp->extent) +
- isonum_711 (rootp->ext_attr_length))
- << s -> u.isofs_sb.s_log_zone_size);
- s->u.isofs_sb.s_firstdatazone = first_data_zone;
- #ifndef BEQUIET
- printk(KERN_DEBUG "Max size:%ld Log zone size:%ldn",
- s->u.isofs_sb.s_max_size,
- 1UL << s->u.isofs_sb.s_log_zone_size);
- printk(KERN_DEBUG "First datazone:%ld Root inode number:%ldn",
- s->u.isofs_sb.s_firstdatazone >> s -> u.isofs_sb.s_log_zone_size,
- s->u.isofs_sb.s_firstdatazone);
- if(high_sierra)
- printk(KERN_DEBUG "Disc in High Sierra format.n");
- #endif
- /*
- * If the Joliet level is set, we _may_ decide to use the
- * secondary descriptor, but can't be sure until after we
- * read the root inode. But before reading the root inode
- * we may need to change the device blocksize, and would
- * rather release the old buffer first. So, we cache the
- * first_data_zone value from the secondary descriptor.
- */
- if (joliet_level) {
- pri = (struct iso_primary_descriptor *) sec;
- rootp = (struct iso_directory_record *)
- pri->root_directory_record;
- first_data_zone = ((isonum_733 (rootp->extent) +
- isonum_711 (rootp->ext_attr_length))
- << s -> u.isofs_sb.s_log_zone_size);
- }
- /*
- * We're all done using the volume descriptor, and may need
- * to change the device blocksize, so release the buffer now.
- */
- brelse(pri_bh);
- brelse(bh);
- /*
- * Force the blocksize to 512 for 512 byte sectors. The file
- * read primitives really get it wrong in a bad way if we don't
- * do this.
- *
- * Note - we should never be setting the blocksize to something
- * less than the hardware sector size for the device. If we
- * do, we would end up having to read larger buffers and split
- * out portions to satisfy requests.
- *
- * Note2- the idea here is that we want to deal with the optimal
- * zonesize in the filesystem. If we have it set to something less,
- * then we have horrible problems with trying to piece together
- * bits of adjacent blocks in order to properly read directory
- * entries. By forcing the blocksize in this way, we ensure
- * that we will never be required to do this.
- */
- if ( orig_zonesize != opt.blocksize ) {
- set_blocksize(dev, orig_zonesize);
- #ifndef BEQUIET
- printk(KERN_DEBUG
- "ISOFS: Forcing new log zone size:%dn", orig_zonesize);
- #endif
- }
- s->s_blocksize = orig_zonesize;
- s->s_blocksize_bits = s -> u.isofs_sb.s_log_zone_size;
- s->u.isofs_sb.s_nls_iocharset = NULL;
- #ifdef CONFIG_JOLIET
- if (joliet_level && opt.utf8 == 0) {
- char * p = opt.iocharset ? opt.iocharset : "iso8859-1";
- s->u.isofs_sb.s_nls_iocharset = load_nls(p);
- if (! s->u.isofs_sb.s_nls_iocharset) {
- /* Fail only if explicit charset specified */
- if (opt.iocharset)
- goto out_unlock;
- s->u.isofs_sb.s_nls_iocharset = load_nls_default();
- }
- }
- #endif
- s->s_op = &isofs_sops;
- s->u.isofs_sb.s_mapping = opt.map;
- s->u.isofs_sb.s_rock = (opt.rock == 'y' ? 2 : 0);
- s->u.isofs_sb.s_rock_offset = -1; /* initial offset, will guess until SP is found*/
- s->u.isofs_sb.s_cruft = opt.cruft;
- s->u.isofs_sb.s_unhide = opt.unhide;
- s->u.isofs_sb.s_uid = opt.uid;
- s->u.isofs_sb.s_gid = opt.gid;
- s->u.isofs_sb.s_utf8 = opt.utf8;
- s->u.isofs_sb.s_nocompress = opt.nocompress;
- /*
- * It would be incredibly stupid to allow people to mark every file
- * on the disk as suid, so we merely allow them to set the default
- * permissions.
- */
- s->u.isofs_sb.s_mode = opt.mode & 0777;
- /*
- * Read the root inode, which _may_ result in changing
- * the s_rock flag. Once we have the final s_rock value,
- * we then decide whether to use the Joliet descriptor.
- */
- inode = iget(s, s->u.isofs_sb.s_firstdatazone);
- /*
- * If this disk has both Rock Ridge and Joliet on it, then we
- * want to use Rock Ridge by default. This can be overridden
- * by using the norock mount option. There is still one other
- * possibility that is not taken into account: a Rock Ridge
- * CD with Unicode names. Until someone sees such a beast, it
- * will not be supported.
- */
- if (s->u.isofs_sb.s_rock == 1) {
- joliet_level = 0;
- } else if (joliet_level) {
- s->u.isofs_sb.s_rock = 0;
- if (s->u.isofs_sb.s_firstdatazone != first_data_zone) {
- s->u.isofs_sb.s_firstdatazone = first_data_zone;
- printk(KERN_DEBUG
- "ISOFS: changing to secondary rootn");
- iput(inode);
- inode = iget(s, s->u.isofs_sb.s_firstdatazone);
- }
- }
- if (opt.check == 'u') {
- /* Only Joliet is case insensitive by default */
- if (joliet_level) opt.check = 'r';
- else opt.check = 's';
- }
- s->u.isofs_sb.s_joliet_level = joliet_level;
- /* check the root inode */
- if (!inode)
- goto out_no_root;
- if (!inode->i_op)
- goto out_bad_root;
- /* get the root dentry */
- s->s_root = d_alloc_root(inode);
- if (!(s->s_root))
- goto out_no_root;
- table = 0;
- if (joliet_level) table += 2;
- if (opt.check == 'r') table++;
- s->s_root->d_op = &isofs_dentry_ops[table];
- return s;
- /*
- * Display error messages and free resources.
- */
- out_bad_root:
- printk(KERN_WARNING "isofs_read_super: root inode not initializedn");
- goto out_iput;
- out_no_root:
- printk(KERN_WARNING "isofs_read_super: get root inode failedn");
- out_iput:
- iput(inode);
- #ifdef CONFIG_JOLIET
- if (s->u.isofs_sb.s_nls_iocharset)
- unload_nls(s->u.isofs_sb.s_nls_iocharset);
- #endif
- goto out_unlock;
- out_no_read:
- printk(KERN_WARNING "isofs_read_super: "
- "bread failed, dev=%s, iso_blknum=%d, block=%dn",
- kdevname(dev), iso_blknum, block);
- goto out_unlock;
- out_bad_zone_size:
- printk(KERN_WARNING "Bad logical zone size %ldn",
- s->u.isofs_sb.s_log_zone_size);
- goto out_freebh;
- out_bad_size:
- printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)n",
- orig_zonesize, blocksize);
- goto out_freebh;
- #ifndef IGNORE_WRONG_MULTI_VOLUME_SPECS
- out_no_support:
- printk(KERN_WARNING "Multi-volume disks not supported.n");
- goto out_freebh;
- #endif
- out_unknown_format:
- if (!silent)
- printk(KERN_WARNING "Unable to identify CD-ROM format.n");
- out_freebh:
- brelse(bh);
- out_unlock:
- return NULL;
- }
- static int isofs_statfs (struct super_block *sb, struct statfs *buf)
- {
- buf->f_type = ISOFS_SUPER_MAGIC;
- buf->f_bsize = sb->s_blocksize;
- buf->f_blocks = (sb->u.isofs_sb.s_nzones
- << (sb->u.isofs_sb.s_log_zone_size - sb->s_blocksize_bits));
- buf->f_bfree = 0;
- buf->f_bavail = 0;
- buf->f_files = sb->u.isofs_sb.s_ninodes;
- buf->f_ffree = 0;
- buf->f_namelen = NAME_MAX;
- return 0;
- }
- /*
- * Get a set of blocks; filling in buffer_heads if already allocated
- * or getblk() if they are not. Returns the number of blocks inserted
- * (0 == error.)
- */
- int isofs_get_blocks(struct inode *inode, long iblock,
- struct buffer_head **bh_result, unsigned long nblocks)
- {
- unsigned long b_off;
- unsigned offset, sect_size;
- unsigned int firstext;
- unsigned long nextino;
- int section, rv;
- lock_kernel();
- rv = 0;
- if (iblock < 0) {
- printk("isofs_get_blocks: block < 0n");
- goto abort;
- }
- b_off = iblock;
-
- offset = 0;
- firstext = inode->u.isofs_i.i_first_extent;
- sect_size = inode->u.isofs_i.i_section_size >> ISOFS_BUFFER_BITS(inode);
- nextino = inode->u.isofs_i.i_next_section_ino;
- section = 0;
- while ( nblocks ) {
- /* If we are *way* beyond the end of the file, print a message.
- * Access beyond the end of the file up to the next page boundary
- * is normal, however because of the way the page cache works.
- * In this case, we just return 0 so that we can properly fill
- * the page with useless information without generating any
- * I/O errors.
- */
- if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
- printk("isofs_get_blocks: block >= EOF (%ld, %ld)n",
- iblock, (unsigned long) inode->i_size);
- goto abort;
- }
-
- if (nextino) {
- while (b_off >= (offset + sect_size)) {
- struct inode *ninode;
-
- offset += sect_size;
- if (nextino == 0)
- goto abort;
- ninode = iget(inode->i_sb, nextino);
- if (!ninode)
- goto abort;
- firstext = ninode->u.isofs_i.i_first_extent;
- sect_size = ninode->u.isofs_i.i_section_size;
- nextino = ninode->u.isofs_i.i_next_section_ino;
- iput(ninode);
-
- if (++section > 100) {
- printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...n");
- printk("isofs_get_blocks: ino=%lu block=%ld firstext=%u sect_size=%u nextino=%lun",
- inode->i_ino, iblock, firstext, (unsigned) sect_size, nextino);
- goto abort;
- }
- }
- }
-
- if ( *bh_result ) {
- (*bh_result)->b_dev = inode->i_dev;
- (*bh_result)->b_blocknr = firstext + b_off - offset;
- (*bh_result)->b_state |= (1UL << BH_Mapped);
- } else {
- *bh_result = sb_getblk(inode->i_sb, firstext+b_off-offset);
- if ( !*bh_result )
- goto abort;
- }
- bh_result++; /* Next buffer head */
- b_off++; /* Next buffer offset */
- nblocks--;
- rv++;
- }
- abort:
- unlock_kernel();
- return rv;
- }
- /*
- * Used by the standard interfaces.
- */
- static int isofs_get_block(struct inode *inode, long iblock,
- struct buffer_head *bh_result, int create)
- {
- if ( create ) {
- printk("isofs_get_block: Kernel tries to allocate a blockn");
- return -EROFS;
- }
- return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
- }
- static int isofs_bmap(struct inode *inode, int block)
- {
- struct buffer_head dummy;
- int error;
- dummy.b_state = 0;
- dummy.b_blocknr = -1000;
- error = isofs_get_block(inode, block, &dummy, 0);
- if (!error)
- return dummy.b_blocknr;
- return 0;
- }
- struct buffer_head *isofs_bread(struct inode *inode, unsigned int block)
- {
- unsigned int blknr = isofs_bmap(inode, block);
- if (!blknr)
- return NULL;
- return sb_bread(inode->i_sb, blknr);
- }
- static int isofs_readpage(struct file *file, struct page *page)
- {
- return block_read_full_page(page,isofs_get_block);
- }
- static int _isofs_bmap(struct address_space *mapping, long block)
- {
- return generic_block_bmap(mapping,block,isofs_get_block);
- }
- static struct address_space_operations isofs_aops = {
- readpage: isofs_readpage,
- sync_page: block_sync_page,
- bmap: _isofs_bmap
- };
- static inline void test_and_set_uid(uid_t *p, uid_t value)
- {
- if(value) {
- *p = value;
- }
- }
- static inline void test_and_set_gid(gid_t *p, gid_t value)
- {
- if(value) {
- *p = value;
- }
- }
- static int isofs_read_level3_size(struct inode * inode)
- {
- unsigned long f_pos = inode->i_ino;
- unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
- int high_sierra = inode->i_sb->u.isofs_sb.s_high_sierra;
- struct buffer_head * bh = NULL;
- unsigned long block, offset;
- int i = 0;
- int more_entries = 0;
- struct iso_directory_record * tmpde = NULL;
- inode->i_size = 0;
- inode->u.isofs_i.i_next_section_ino = 0;
- block = f_pos >> ISOFS_BUFFER_BITS(inode);
- offset = f_pos & (bufsize-1);
- do {
- struct iso_directory_record * de;
- unsigned int de_len;
- if (!bh) {
- bh = sb_bread(inode->i_sb, block);
- if (!bh)
- goto out_noread;
- }
- de = (struct iso_directory_record *) (bh->b_data + offset);
- de_len = *(unsigned char *) de;
- if (de_len == 0) {
- brelse(bh);
- bh = NULL;
- f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
- block = f_pos >> ISOFS_BUFFER_BITS(inode);
- offset = 0;
- continue;
- }
- offset += de_len;
- /* Make sure we have a full directory entry */
- if (offset >= bufsize) {
- int slop = bufsize - offset + de_len;
- if (!tmpde) {
- tmpde = kmalloc(256, GFP_KERNEL);
- if (!tmpde)
- goto out_nomem;
- }
- memcpy(tmpde, de, slop);
- offset &= bufsize - 1;
- block++;
- brelse(bh);
- bh = NULL;
- if (offset) {
- bh = sb_bread(inode->i_sb, block);
- if (!bh)
- goto out_noread;
- memcpy((void *) tmpde + slop, bh->b_data, offset);
- }
- de = tmpde;
- }
- inode->i_size += isonum_733(de->size);
- if (i == 1)
- inode->u.isofs_i.i_next_section_ino = f_pos;
- more_entries = de->flags[-high_sierra] & 0x80;
- f_pos += de_len;
- i++;
- if(i > 100)
- goto out_toomany;
- } while(more_entries);
- out:
- if (tmpde)
- kfree(tmpde);
- if (bh)
- brelse(bh);
- return 0;
- out_nomem:
- if (bh)
- brelse(bh);
- return -ENOMEM;
- out_noread:
- printk(KERN_INFO "ISOFS: unable to read i-node block %lun", block);
- if (tmpde)
- kfree(tmpde);
- return -EIO;
- out_toomany:
- printk(KERN_INFO "isofs_read_level3_size: "
- "More than 100 file sections ?!?, aborting...n"
- "isofs_read_level3_size: inode=%lu ino=%lun",
- inode->i_ino, f_pos);
- goto out;
- }
- static void isofs_read_inode(struct inode * inode)
- {
- struct super_block *sb = inode->i_sb;
- unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
- int block = inode->i_ino >> ISOFS_BUFFER_BITS(inode);
- int high_sierra = sb->u.isofs_sb.s_high_sierra;
- struct buffer_head * bh = NULL;
- struct iso_directory_record * de;
- struct iso_directory_record * tmpde = NULL;
- unsigned int de_len;
- unsigned long offset;
- int volume_seq_no, i;
- bh = sb_bread(inode->i_sb, block);
- if (!bh)
- goto out_badread;
- offset = (inode->i_ino & (bufsize - 1));
- de = (struct iso_directory_record *) (bh->b_data + offset);
- de_len = *(unsigned char *) de;
- if (offset + de_len > bufsize) {
- int frag1 = bufsize - offset;
- tmpde = kmalloc(de_len, GFP_KERNEL);
- if (tmpde == NULL) {
- printk(KERN_INFO "isofs_read_inode: out of memoryn");
- goto fail;
- }
- memcpy(tmpde, bh->b_data + offset, frag1);
- brelse(bh);
- bh = sb_bread(inode->i_sb, ++block);
- if (!bh)
- goto out_badread;
- memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
- de = tmpde;
- }
- /* Assume it is a normal-format file unless told otherwise */
- inode->u.isofs_i.i_file_format = isofs_file_normal;
- if (de->flags[-high_sierra] & 2) {
- inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR;
- inode->i_nlink = 1; /* Set to 1. We know there are 2, but
- the find utility tries to optimize
- if it is 2, and it screws up. It is
- easier to give 1 which tells find to
- do it the hard way. */
- } else {
- /* Everybody gets to read the file. */
- inode->i_mode = inode->i_sb->u.isofs_sb.s_mode;
- inode->i_nlink = 1;
- inode->i_mode |= S_IFREG;
- /* If there are no periods in the name,
- * then set the execute permission bit
- */
- for(i=0; i< de->name_len[0]; i++)
- if(de->name[i]=='.' || de->name[i]==';')
- break;
- if(i == de->name_len[0] || de->name[i] == ';')
- inode->i_mode |= S_IXUGO; /* execute permission */
- }
- inode->i_uid = inode->i_sb->u.isofs_sb.s_uid;
- inode->i_gid = inode->i_sb->u.isofs_sb.s_gid;
- inode->i_blocks = inode->i_blksize = 0;
- inode->u.isofs_i.i_section_size = isonum_733 (de->size);
- if(de->flags[-high_sierra] & 0x80) {
- if(isofs_read_level3_size(inode)) goto fail;
- } else {
- inode->i_size = isonum_733 (de->size);
- }
- /*
- * The ISO-9660 filesystem only stores 32 bits for file size.
- * mkisofs handles files up to 2GB-2 = 2147483646 = 0x7FFFFFFE bytes
- * in size. This is according to the large file summit paper from 1996.
- * WARNING: ISO-9660 filesystems > 1 GB and even > 2 GB are fully
- * legal. Do not prevent to use DVD's schilling@fokus.gmd.de
- */
- if ((inode->i_size < 0 || inode->i_size > 0x7FFFFFFE) &&
- inode->i_sb->u.isofs_sb.s_cruft == 'n') {
- printk(KERN_WARNING "Warning: defective CD-ROM. "
- "Enabling "cruft" mount option.n");
- inode->i_sb->u.isofs_sb.s_cruft = 'y';
- }
- /*
- * Some dipshit decided to store some other bit of information
- * in the high byte of the file length. Catch this and holler.
- * WARNING: this will make it impossible for a file to be > 16MB
- * on the CDROM.
- */
- if (inode->i_sb->u.isofs_sb.s_cruft == 'y' &&
- inode->i_size & 0xff000000) {
- inode->i_size &= 0x00ffffff;
- }
- if (de->interleave[0]) {
- printk("Interleaved files not (yet) supported.n");
- inode->i_size = 0;
- }
- /* I have no idea what file_unit_size is used for, so
- we will flag it for now */
- if (de->file_unit_size[0] != 0) {
- printk("File unit size != 0 for ISO file (%ld).n",
- inode->i_ino);
- }
- /* I have no idea what other flag bits are used for, so
- we will flag it for now */
- #ifdef DEBUG
- if((de->flags[-high_sierra] & ~2)!= 0){
- printk("Unusual flag settings for ISO file (%ld %x).n",
- inode->i_ino, de->flags[-high_sierra]);
- }
- #endif
- inode->i_mtime = inode->i_atime = inode->i_ctime =
- iso_date(de->date, high_sierra);
- inode->u.isofs_i.i_first_extent = (isonum_733 (de->extent) +
- isonum_711 (de->ext_attr_length));
- /* Set the number of blocks for stat() - should be done before RR */
- inode->i_blksize = PAGE_CACHE_SIZE; /* For stat() only */
- inode->i_blocks = (inode->i_size + 511) >> 9;
- /*
- * Now test for possible Rock Ridge extensions which will override
- * some of these numbers in the inode structure.
- */
- if (!high_sierra) {
- parse_rock_ridge_inode(de, inode);
- /* if we want uid/gid set, override the rock ridge setting */
- test_and_set_uid(&inode->i_uid, inode->i_sb->u.isofs_sb.s_uid);
- test_and_set_gid(&inode->i_gid, inode->i_sb->u.isofs_sb.s_gid);
- }
- /* get the volume sequence number */
- volume_seq_no = isonum_723 (de->volume_sequence_number) ;
- /*
- * Disable checking if we see any volume number other than 0 or 1.
- * We could use the cruft option, but that has multiple purposes, one
- * of which is limiting the file size to 16Mb. Thus we silently allow
- * volume numbers of 0 to go through without complaining.
- */
- if (inode->i_sb->u.isofs_sb.s_cruft == 'n' &&
- (volume_seq_no != 0) && (volume_seq_no != 1)) {
- printk(KERN_WARNING "Warning: defective CD-ROM "
- "(volume sequence number %d). "
- "Enabling "cruft" mount option.n", volume_seq_no);
- inode->i_sb->u.isofs_sb.s_cruft = 'y';
- }
- /* Install the inode operations vector */
- #ifndef IGNORE_WRONG_MULTI_VOLUME_SPECS
- if (inode->i_sb->u.isofs_sb.s_cruft != 'y' &&
- (volume_seq_no != 0) && (volume_seq_no != 1)) {
- printk(KERN_WARNING "Multi-volume CD somehow got mounted.n");
- } else
- #endif /*IGNORE_WRONG_MULTI_VOLUME_SPECS */
- {
- if (S_ISREG(inode->i_mode)) {
- inode->i_fop = &generic_ro_fops;
- switch ( inode->u.isofs_i.i_file_format ) {
- #ifdef CONFIG_ZISOFS
- case isofs_file_compressed:
- inode->i_data.a_ops = &zisofs_aops;
- break;
- #endif
- default:
- inode->i_data.a_ops = &isofs_aops;
- break;
- }
- } else if (S_ISDIR(inode->i_mode)) {
- inode->i_op = &isofs_dir_inode_operations;
- inode->i_fop = &isofs_dir_operations;
- } else if (S_ISLNK(inode->i_mode)) {
- inode->i_op = &page_symlink_inode_operations;
- inode->i_data.a_ops = &isofs_symlink_aops;
- } else
- /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
- init_special_inode(inode, inode->i_mode,
- kdev_t_to_nr(inode->i_rdev));
- }
- out:
- if (tmpde)
- kfree(tmpde);
- if (bh)
- brelse(bh);
- return;
- out_badread:
- printk(KERN_WARNING "ISOFS: unable to read i-node blockn");
- fail:
- make_bad_inode(inode);
- goto out;
- }
- #ifdef LEAK_CHECK
- #undef malloc
- #undef free_s
- #undef sb_bread
- #undef brelse
- void * leak_check_malloc(unsigned int size){
- void * tmp;
- check_malloc++;
- tmp = kmalloc(size, GFP_KERNEL);
- return tmp;
- }
- void leak_check_free_s(void * obj, int size){
- check_malloc--;
- return kfree(obj);
- }
- struct buffer_head * leak_check_bread(struct super_block *sb, int block){
- check_bread++;
- return sb_bread(sb, block);
- }
- void leak_check_brelse(struct buffer_head * bh){
- check_bread--;
- return brelse(bh);
- }
- #endif
- static DECLARE_FSTYPE_DEV(iso9660_fs_type, "iso9660", isofs_read_super);
- static int __init init_iso9660_fs(void)
- {
- #ifdef CONFIG_ZISOFS
- int err;
- err = zisofs_init();
- if ( err )
- return err;
- #endif
- return register_filesystem(&iso9660_fs_type);
- }
- static void __exit exit_iso9660_fs(void)
- {
- unregister_filesystem(&iso9660_fs_type);
- #ifdef CONFIG_ZISOFS
- zisofs_cleanup();
- #endif
- }
- EXPORT_NO_SYMBOLS;
- module_init(init_iso9660_fs)
- module_exit(exit_iso9660_fs)
- MODULE_LICENSE("GPL");