Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | /* * linux/fs/affs/symlink.c * * 1995 Hans-Joachim Widmaier - Modified for affs. * * Copyright (C) 1991, 1992 Linus Torvalds * * affs symlink handling code */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/malloc.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/affs_fs.h> #include <linux/amigaffs.h> #include <asm/uaccess.h> #define MIN(a,b) (((a) < (b)) ? (a) : (b)) static int affs_readlink(struct dentry *, char *, int); static struct dentry *affs_follow_link(struct dentry *dentry, struct dentry *base, unsigned int); struct inode_operations affs_symlink_inode_operations = { NULL, /* no file-operations */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ affs_readlink, /* readlink */ affs_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL, /* permission */ NULL /* smap */ }; static int affs_readlink(struct dentry *dentry, char *buffer, int buflen) { struct inode *inode = dentry->d_inode; struct buffer_head *bh; struct slink_front *lf; int i, j; char c; char lc; char *pf; pr_debug("AFFS: readlink(ino=%lu,buflen=%d)\n",inode->i_ino,buflen); bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode)); if (!bh) { affs_warning(inode->i_sb,"follow_link","Unable to read i-node block %lu\n", inode->i_ino); return -EIO; } lf = (struct slink_front *)bh->b_data; lc = 0; i = 0; j = 0; pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/"; if (strchr(lf->symname,':')) { /* Handle assign or volume name */ while (i < buflen && (c = pf[i])) { put_user(c,buffer++); i++; } while (i < buflen && (c = lf->symname[j]) != ':') { put_user(c,buffer++); i++, j++; } if (i < buflen) { put_user('/',buffer++); i++, j++; } lc = '/'; } while (i < buflen && (c = lf->symname[j])) { if (c == '/' && lc == '/' && (i + 3 < buflen)) { /* parent dir */ put_user('.',buffer++); put_user('.',buffer++); i += 2; } put_user(c,buffer++); lc = c; i++, j++; } affs_brelse(bh); return i; } static struct dentry * affs_follow_link(struct dentry *dentry, struct dentry *base, unsigned int follow) { struct inode *inode = dentry->d_inode; struct buffer_head *bh; struct slink_front *lf; char *buffer; int i, j; char c; char lc; char *pf; pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino); if (!(buffer = kmalloc(1024,GFP_KERNEL))) { dput(base); return ERR_PTR(-ENOSPC); } bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode)); if (!bh) { affs_warning(inode->i_sb,"follow_link","Unable to read i-node block %lu\n", inode->i_ino); kfree(buffer); dput(base); return ERR_PTR(-EIO); } i = 0; j = 0; lf = (struct slink_front *)bh->b_data; lc = 0; pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/"; if (strchr(lf->symname,':')) { /* Handle assign or volume name */ while (i < 1023 && (c = pf[i])) buffer[i++] = c; while (i < 1023 && lf->symname[j] != ':') buffer[i++] = lf->symname[j++]; if (i < 1023) buffer[i++] = '/'; j++; lc = '/'; } while (i < 1023 && (c = lf->symname[j])) { if (c == '/' && lc == '/' && i < 1020) { /* parent dir */ buffer[i++] = '.'; buffer[i++] = '.'; } buffer[i++] = c; lc = c; j++; } buffer[i] = '\0'; affs_brelse(bh); base = lookup_dentry(buffer,base,follow); kfree(buffer); return base; } |