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 | /* * QNX4 file system, Linux implementation. * * Version : 0.1 * * Using parts of the xiafs filesystem. * * History : * * 28-05-1998 by Richard Frowijn : first release. * 21-06-1998 by Frank Denis : ugly changes to make it compile on Linux 2.1.99+ */ /* THIS FILE HAS TO BE REWRITTEN */ #include <linux/string.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/qnx4_fs.h> #include <linux/stat.h> #include <asm/segment.h> #include <asm/uaccess.h> static int qnx4_readlink(struct dentry *, char *, int); static struct dentry *qnx4_follow_link(struct dentry *, struct dentry *, unsigned int follow); /* * symlinks can't do much... */ struct inode_operations qnx4_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 */ qnx4_readlink, /* readlink */ qnx4_follow_link, /* follow_link */ NULL, /* get_block */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* truncate */ NULL, /* permission */ NULL /* revalidate */ }; static struct dentry *qnx4_follow_link(struct dentry *dentry, struct dentry *base, unsigned int follow) { #if 0 struct inode *inode = dentry->d_inode; struct buffer_head *bh; if (!inode) { return ERR_PTR(-ENOENT); } if (current->link_count > 5) { return ERR_PTR(-ELOOP); } if (!(bh = qnx4_bread(inode, 0, 0))) { return ERR_PTR(-EIO); } current->link_count++; current->link_count--; brelse(bh); return 0; #else printk("qnx4: qnx4_follow_link needs to be fixed.\n"); return ERR_PTR(-EIO); #endif } static int qnx4_readlink(struct dentry *dentry, char *buffer, int buflen) { struct inode *inode = dentry->d_inode; struct buffer_head *bh; int i; char c; struct qnx4_inode_info *qnx4_ino; QNX4DEBUG(("qnx4: qnx4_readlink() called\n")); if (buffer == NULL || inode == NULL || !S_ISLNK(inode->i_mode)) { return -EINVAL; } qnx4_ino = &inode->u.qnx4_i; if (buflen > 1023) { buflen = 1023; } bh = bread(inode->i_dev, qnx4_ino->i_first_xtnt.xtnt_blk, QNX4_BLOCK_SIZE); if (bh == NULL) { QNX4DEBUG(("qnx4: NULL symlink bh\n")); return 0; } QNX4DEBUG(("qnx4: qnx4_bread sym called -> [%s]\n", bh->b_data)); if (bh->b_data[0] != 0) { i = 0; while (i < buflen && (c = bh->b_data[i])) { i++; put_user(c, buffer++); } brelse(bh); return i; } else { brelse(bh); memcpy(buffer, "fixme", 5); return 5; } } |