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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [isofs/] [dir.c] - Rev 1782
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/* * linux/fs/isofs/dir.c * * (C) 1992, 1993, 1994 Eric Youngdale Modified for ISO9660 filesystem. * * (C) 1991 Linus Torvalds - minix filesystem * * Steve Beynon : Missing last directory entries fixed * (stephen@askone.demon.co.uk) : 21st June 1996 * * isofs directory handling functions */ #include <linux/errno.h> #include <linux/fs.h> #include <linux/iso_fs.h> #include <linux/kernel.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/malloc.h> #include <linux/sched.h> #include <linux/locks.h> #include <asm/segment.h> static int isofs_readdir(struct inode *, struct file *, void *, filldir_t); static struct file_operations isofs_dir_operations = { NULL, /* lseek - default */ NULL, /* read */ NULL, /* write - bad */ isofs_readdir, /* readdir */ NULL, /* select - default */ NULL, /* ioctl - default */ NULL, /* no special open code */ NULL, /* no special release code */ NULL /* fsync */ }; /* * directories can handle most operations... */ struct inode_operations isofs_dir_inode_operations = { &isofs_dir_operations, /* default directory file-ops */ NULL, /* create */ isofs_lookup, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ isofs_bmap, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static int parent_inode_number(struct inode * inode, struct iso_directory_record * de) { int inode_number = inode->i_ino; if ((inode->i_sb->u.isofs_sb.s_firstdatazone) != inode->i_ino) inode_number = inode->u.isofs_i.i_backlink; if (inode_number != -1) return inode_number; /* This should never happen, but who knows. Try to be forgiving */ return isofs_lookup_grandparent(inode, find_rock_ridge_relocation(de, inode)); } static int isofs_name_translate(char * old, int len, char * new) { int i, c; for (i = 0; i < len; i++) { c = old[i]; if (!c) break; if (c >= 'A' && c <= 'Z') c |= 0x20; /* lower case */ /* Drop trailing '.;1' (ISO9660:1988 7.5.1 requires period) */ if (c == '.' && i == len - 3 && old[i + 1] == ';' && old[i + 2] == '1') break; /* Drop trailing ';1' */ if (c == ';' && i == len - 2 && old[i + 1] == '1') break; /* Convert remaining ';' to '.' */ if (c == ';') c = '.'; new[i] = c; } return i; } /* * This should _really_ be cleaned up some day.. */ static int do_isofs_readdir(struct inode *inode, struct file *filp, void *dirent, filldir_t filldir, char * tmpname, struct iso_directory_record * tmpde) { unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); unsigned char bufbits = ISOFS_BUFFER_BITS(inode); unsigned int block, offset; int inode_number = 0; /* Quiet GCC */ struct buffer_head *bh; int len; int map; int high_sierra; int first_de = 1; char *p = NULL; /* Quiet GCC */ struct iso_directory_record *de; offset = filp->f_pos & (bufsize - 1); block = isofs_bmap(inode, filp->f_pos >> bufbits); high_sierra = inode->i_sb->u.isofs_sb.s_high_sierra; if (!block) return 0; if (!(bh = breada(inode->i_dev, block, bufsize, filp->f_pos, inode->i_size))) return 0; while (filp->f_pos < inode->i_size) { int de_len, next_offset; #ifdef DEBUG printk("Block, offset, f_pos: %x %x %x\n", block, offset, filp->f_pos); printk("inode->i_size = %x\n",inode->i_size); #endif /* Next directory_record on next CDROM sector */ if (offset >= bufsize) { #ifdef DEBUG printk("offset >= bufsize\n"); #endif brelse(bh); offset = 0; block = isofs_bmap(inode, (filp->f_pos) >> bufbits); if (!block) return 0; bh = breada(inode->i_dev, block, bufsize, filp->f_pos, inode->i_size); if (!bh) return 0; continue; } de = (struct iso_directory_record *) (bh->b_data + offset); if(first_de) inode_number = (block << bufbits) + (offset & (bufsize - 1)); de_len = *(unsigned char *) de; #ifdef DEBUG printk("de_len = %ld\n", de_len); #endif /* If the length byte is zero, we should move on to the next CDROM sector. If we are at the end of the directory, we kick out of the while loop. */ if (de_len == 0) { brelse(bh); filp->f_pos = ((filp->f_pos & ~(ISOFS_BLOCK_SIZE - 1)) + ISOFS_BLOCK_SIZE); offset = 0; block = isofs_bmap(inode, (filp->f_pos) >> bufbits); if (!block) return 0; bh = breada(inode->i_dev, block, bufsize, filp->f_pos, inode->i_size); if (!bh) return 0; continue; } /* Make sure that the entire directory record is in the current bh block. If not, put the two halves together in "tmpde" */ next_offset = offset + de_len; if (next_offset > bufsize) { #ifdef DEBUG printk("next_offset (%x) > bufsize (%x)\n",next_offset,bufsize); #endif next_offset &= (bufsize - 1); memcpy(tmpde, de, bufsize - offset); brelse(bh); block = isofs_bmap(inode, (filp->f_pos + de_len) >> bufbits); if (!block) { return 0; } bh = breada(inode->i_dev, block, bufsize, filp->f_pos, inode->i_size); if (!bh) { #ifdef DEBUG printk("!bh block=%ld, bufsize=%ld\n",block,bufsize); printk("filp->f_pos = %ld\n",filp->f_pos); printk("inode->i_size = %ld\n", inode->i_size); #endif return 0; } memcpy(bufsize - offset + (char *) tmpde, bh->b_data, next_offset); de = tmpde; } offset = next_offset; if(de->flags[-high_sierra] & 0x80) { first_de = 0; filp->f_pos += de_len; continue; } first_de = 1; /* Handle the case of the '.' directory */ if (de->name_len[0] == 1 && de->name[0] == 0) { if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino) < 0) break; filp->f_pos += de_len; continue; } len = 0; /* Handle the case of the '..' directory */ if (de->name_len[0] == 1 && de->name[0] == 1) { inode_number = parent_inode_number(inode, de); if (inode_number == -1) break; if (filldir(dirent, "..", 2, filp->f_pos, inode_number) < 0) break; filp->f_pos += de_len; continue; } /* Handle everything else. Do name translation if there is no Rock Ridge NM field. */ if (inode->i_sb->u.isofs_sb.s_unhide == 'n') { /* Do not report hidden or associated files */ if (de->flags[-high_sierra] & 5) { filp->f_pos += de_len; continue; } } map = 1; if (inode->i_sb->u.isofs_sb.s_rock) { len = get_rock_ridge_filename(de, tmpname, inode); if (len != 0) { p = tmpname; map = 0; } } if (map) { if (inode->i_sb->u.isofs_sb.s_joliet_level) { len = get_joliet_filename(de, inode, tmpname); p = tmpname; } else { if (inode->i_sb->u.isofs_sb.s_mapping == 'n') { len = isofs_name_translate(de->name, de->name_len[0], tmpname); p = tmpname; } else { p = de->name; len = de->name_len[0]; } } } if (len > 0) { if (filldir(dirent, p, len, filp->f_pos, inode_number) < 0) break; dcache_add(inode, p, len, inode_number); } filp->f_pos += de_len; continue; } brelse(bh); return 0; } /* * Handle allocation of temporary space for name translation and * handling split directory entries.. The real work is done by * "do_isofs_readdir()". */ static int isofs_readdir(struct inode *inode, struct file *filp, void *dirent, filldir_t filldir) { int result; char * tmpname; struct iso_directory_record * tmpde; if (!inode || !S_ISDIR(inode->i_mode)) return -EBADF; tmpname = (char *) __get_free_page(GFP_KERNEL); if (!tmpname) return -ENOMEM; tmpde = (struct iso_directory_record *) (tmpname+1024); result = do_isofs_readdir(inode, filp, dirent, filldir, tmpname, tmpde); free_page((unsigned long) tmpname); return result; }
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