diff options
Diffstat (limited to 'fs/isofs/symlink.c')
-rw-r--r-- | fs/isofs/symlink.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/fs/isofs/symlink.c b/fs/isofs/symlink.c new file mode 100644 index 000000000..fa4a45ba6 --- /dev/null +++ b/fs/isofs/symlink.c @@ -0,0 +1,106 @@ +/* + * linux/fs/isofs/symlink.c + * + * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * isofs symlink handling code. This is only used with the Rock Ridge + * extensions to iso9660 + */ + +#include <asm/segment.h> + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/iso_fs.h> +#include <linux/stat.h> +#include <linux/malloc.h> + +static int isofs_readlink(struct inode *, char *, int); +static int isofs_follow_link(struct inode *, struct inode *, int, int, struct inode **); + +/* + * symlinks can't do much... + */ +struct inode_operations isofs_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 */ + isofs_readlink, /* readlink */ + isofs_follow_link, /* follow_link */ + NULL, /* bmap */ + NULL, /* truncate */ + NULL /* permission */ +}; + +static int isofs_follow_link(struct inode * dir, struct inode * inode, + int flag, int mode, struct inode ** res_inode) +{ + int error; + char * pnt; + + if (!dir) { + dir = current->fs->root; + dir->i_count++; + } + if (!inode) { + iput(dir); + *res_inode = NULL; + return -ENOENT; + } + if (!S_ISLNK(inode->i_mode)) { + iput(dir); + *res_inode = inode; + return 0; + } + if ((current->link_count > 5) || + !(pnt = get_rock_ridge_symlink(inode))) { + iput(dir); + iput(inode); + *res_inode = NULL; + return -ELOOP; + } + iput(inode); + current->link_count++; + error = open_namei(pnt,flag,mode,res_inode,dir); + current->link_count--; + kfree(pnt); + return error; +} + +static int isofs_readlink(struct inode * inode, char * buffer, int buflen) +{ + char * pnt; + int i; + char c; + + if (!S_ISLNK(inode->i_mode)) { + iput(inode); + return -EINVAL; + } + + if (buflen > 1023) + buflen = 1023; + pnt = get_rock_ridge_symlink(inode); + + iput(inode); + if (!pnt) + return 0; + i = 0; + + while (i<buflen && (c = pnt[i])) { + i++; + put_fs_byte(c,buffer++); + } + kfree(pnt); + return i; +} |