![Christof Schmitt](/assets/img/avatar_default.png)
After the latest changes, the list of FCP devices is only used to lookup the adapter for requests from the actcli tool. Change this to use the lookup function in the cio layer. Now we can remove the adapter list and have one place less to use the global config_lock. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Acked-by: Felix Beck <felix@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
252 lines
6 KiB
C
252 lines
6 KiB
C
/*
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* zfcp device driver
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*
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* Userspace interface for accessing the
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* Access Control Lists / Control File Data Channel
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*
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* Copyright IBM Corporation 2008
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <asm/ccwdev.h>
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#include "zfcp_def.h"
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#include "zfcp_ext.h"
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#include "zfcp_fsf.h"
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#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
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#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
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#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
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#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
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#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
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#define ZFCP_CFDC_DOWNLOAD 0x00000001
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#define ZFCP_CFDC_UPLOAD 0x00000002
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#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
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#define ZFCP_CFDC_IOC_MAGIC 0xDD
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#define ZFCP_CFDC_IOC \
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_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
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/**
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* struct zfcp_cfdc_data - data for ioctl cfdc interface
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* @signature: request signature
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* @devno: FCP adapter device number
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* @command: command code
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* @fsf_status: returns status of FSF command to userspace
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* @fsf_status_qual: returned to userspace
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* @payloads: access conflicts list
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* @control_file: access control table
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*/
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struct zfcp_cfdc_data {
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u32 signature;
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u32 devno;
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u32 command;
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u32 fsf_status;
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u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
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u8 payloads[256];
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u8 control_file[0];
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};
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static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
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void __user *user_buffer)
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{
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unsigned int length;
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unsigned int size = ZFCP_CFDC_MAX_SIZE;
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while (size) {
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length = min((unsigned int)size, sg->length);
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if (copy_from_user(sg_virt(sg++), user_buffer, length))
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return -EFAULT;
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user_buffer += length;
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size -= length;
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}
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return 0;
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}
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static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
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struct scatterlist *sg)
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{
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unsigned int length;
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unsigned int size = ZFCP_CFDC_MAX_SIZE;
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while (size) {
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length = min((unsigned int) size, sg->length);
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if (copy_to_user(user_buffer, sg_virt(sg++), length))
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return -EFAULT;
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user_buffer += length;
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size -= length;
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}
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return 0;
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}
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static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
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{
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char busid[9];
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snprintf(busid, sizeof(busid), "0.0.%04x", devno);
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return zfcp_get_adapter_by_busid(busid);
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}
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static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
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{
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switch (command) {
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case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
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break;
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case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
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break;
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case ZFCP_CFDC_CMND_FULL_ACCESS:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
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break;
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case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
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break;
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case ZFCP_CFDC_CMND_UPLOAD:
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fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
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fsf_cfdc->option = 0;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
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u8 __user *control_file)
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{
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int retval;
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retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
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if (retval)
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return retval;
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sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
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if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
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command & ZFCP_CFDC_DOWNLOAD) {
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retval = zfcp_cfdc_copy_from_user(sg, control_file);
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if (retval) {
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zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
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return -EFAULT;
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}
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}
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return 0;
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}
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static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
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struct zfcp_fsf_req *req)
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{
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data->fsf_status = req->qtcb->header.fsf_status;
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memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
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sizeof(union fsf_status_qual));
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memcpy(&data->payloads, &req->qtcb->bottom.support.els,
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sizeof(req->qtcb->bottom.support.els));
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}
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static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
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unsigned long buffer)
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{
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struct zfcp_cfdc_data *data;
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struct zfcp_cfdc_data __user *data_user;
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struct zfcp_adapter *adapter;
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struct zfcp_fsf_req *req;
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struct zfcp_fsf_cfdc *fsf_cfdc;
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int retval;
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if (command != ZFCP_CFDC_IOC)
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return -ENOTTY;
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data_user = (void __user *) buffer;
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if (!data_user)
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return -EINVAL;
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fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
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if (!fsf_cfdc)
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return -ENOMEM;
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data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
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if (!data) {
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retval = -ENOMEM;
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goto no_mem_sense;
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}
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retval = copy_from_user(data, data_user, sizeof(*data));
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if (retval) {
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retval = -EFAULT;
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goto free_buffer;
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}
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if (data->signature != 0xCFDCACDF) {
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retval = -EINVAL;
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goto free_buffer;
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}
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retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
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adapter = zfcp_cfdc_get_adapter(data->devno);
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if (!adapter) {
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retval = -ENXIO;
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goto free_buffer;
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}
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retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
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data_user->control_file);
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if (retval)
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goto adapter_put;
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req = zfcp_fsf_control_file(adapter, fsf_cfdc);
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if (IS_ERR(req)) {
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retval = PTR_ERR(req);
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goto free_sg;
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}
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if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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retval = -ENXIO;
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goto free_fsf;
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}
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zfcp_cfdc_req_to_sense(data, req);
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retval = copy_to_user(data_user, data, sizeof(*data_user));
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if (retval) {
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retval = -EFAULT;
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goto free_fsf;
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}
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if (data->command & ZFCP_CFDC_UPLOAD)
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retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
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fsf_cfdc->sg);
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free_fsf:
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zfcp_fsf_req_free(req);
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free_sg:
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zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
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adapter_put:
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zfcp_adapter_put(adapter);
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free_buffer:
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kfree(data);
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no_mem_sense:
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kfree(fsf_cfdc);
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return retval;
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}
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static const struct file_operations zfcp_cfdc_fops = {
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.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = zfcp_cfdc_dev_ioctl
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#endif
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};
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struct miscdevice zfcp_cfdc_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "zfcp_cfdc",
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.fops = &zfcp_cfdc_fops,
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};
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