static int nfs_follow_link(struct inode *dir, struct inode *inode, int flag, int mode, struct inode **res_inode) { int error, *mem; unsigned int len; char *res, *res2; *res_inode = NULL; if (!dir) { dir = current->fs->root; dir->i_count++; } if (!inode) { iput(dir); return -ENOENT; } if (!S_ISLNK(inode->i_mode)) { iput(dir); *res_inode = inode; return 0; } if (current->link_count > 5) { iput(inode); iput(dir); return -ELOOP; } error = nfs_proc_readlink(NFS_SERVER(inode), NFS_FH(inode), &mem, &res, &len, NFS_MAXPATHLEN); if (error) { iput(inode); iput(dir); kfree(mem); return error; } while ((res2 = (char *) kmalloc(NFS_MAXPATHLEN + 1, GFP_NFS)) == NULL) { schedule(); } memcpy(res2, res, len); res2[len] = '\0'; kfree(mem); iput(inode); current->link_count++; error = open_namei(res2, flag, mode, res_inode, dir); current->link_count--; kfree_s(res2, NFS_MAXPATHLEN + 1); return error; }
int nfs_readlink(struct file *filp, char *buf, int bufsize) { struct nfs_fh *fhandle; int status; DPRINTF(CLU_LEVEL,("nfs_readlink:\n")); demand(filp, bogus filp); if (buf == (char *) 0) {errno = EFAULT; return -1;} fhandle = GETFHANDLE(filp); status = nfs_proc_readlink(fhandle,buf); if (status != 0) { errno = status; return -1; } else { return strlen(buf); } }
static int nfs_readlink(struct inode *inode, char *buffer, int buflen) { int error, *mem; unsigned int len; char *res; if (!S_ISLNK(inode->i_mode)) { iput(inode); return -EINVAL; } if (buflen > NFS_MAXPATHLEN) buflen = NFS_MAXPATHLEN; error = nfs_proc_readlink(NFS_SERVER(inode), NFS_FH(inode), &mem, &res, &len, buflen); iput(inode); if (! error) { memcpy_tofs(buffer, res, len); put_fs_byte('\0', buffer + len); error = len; } kfree(mem); return error; }