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![Christoph Hellwig](/assets/img/avatar_default.png)
The only overlap between the block open flags mapped into the fmode_t and other uses of fmode_t are FMODE_READ and FMODE_WRITE. Define a new blk_mode_t instead for use in blkdev_get_by_{dev,path}, ->open and ->ioctl and stop abusing fmode_t. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jack Wang <jinpu.wang@ionos.com> [rnbd] Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20230608110258.189493-28-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
2922 lines
71 KiB
C
2922 lines
71 KiB
C
/*
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* Copyright (C) 2000 Jens Axboe <axboe@suse.de>
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* Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
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* Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
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* DVD-RAM devices.
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*
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* Theory of operation:
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*
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* At the lowest level, there is the standard driver for the CD/DVD device,
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* such as drivers/scsi/sr.c. This driver can handle read and write requests,
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* but it doesn't know anything about the special restrictions that apply to
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* packet writing. One restriction is that write requests must be aligned to
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* packet boundaries on the physical media, and the size of a write request
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* must be equal to the packet size. Another restriction is that a
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* GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
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* command, if the previous command was a write.
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*
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* The purpose of the packet writing driver is to hide these restrictions from
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* higher layers, such as file systems, and present a block device that can be
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* randomly read and written using 2kB-sized blocks.
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*
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* The lowest layer in the packet writing driver is the packet I/O scheduler.
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* Its data is defined by the struct packet_iosched and includes two bio
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* queues with pending read and write requests. These queues are processed
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* by the pkt_iosched_process_queue() function. The write requests in this
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* queue are already properly aligned and sized. This layer is responsible for
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* issuing the flush cache commands and scheduling the I/O in a good order.
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*
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* The next layer transforms unaligned write requests to aligned writes. This
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* transformation requires reading missing pieces of data from the underlying
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* block device, assembling the pieces to full packets and queuing them to the
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* packet I/O scheduler.
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*
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* At the top layer there is a custom ->submit_bio function that forwards
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* read requests directly to the iosched queue and puts write requests in the
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* unaligned write queue. A kernel thread performs the necessary read
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* gathering to convert the unaligned writes to aligned writes and then feeds
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* them to the packet I/O scheduler.
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*
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*************************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/backing-dev.h>
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#include <linux/compat.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/freezer.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/nospec.h>
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#include <linux/pktcdvd.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_ioctl.h>
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#include <asm/unaligned.h>
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#define DRIVER_NAME "pktcdvd"
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#define MAX_SPEED 0xffff
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static DEFINE_MUTEX(pktcdvd_mutex);
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static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
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static struct proc_dir_entry *pkt_proc;
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static int pktdev_major;
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static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
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static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
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static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
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static mempool_t psd_pool;
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static struct bio_set pkt_bio_set;
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/* /sys/class/pktcdvd */
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static struct class class_pktcdvd;
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static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
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/* forward declaration */
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static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
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static int pkt_remove_dev(dev_t pkt_dev);
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static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
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{
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return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
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}
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/**********************************************************
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* sysfs interface for pktcdvd
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* by (C) 2006 Thomas Maier <balagi@justmail.de>
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/sys/class/pktcdvd/pktcdvd[0-7]/
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stat/reset
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stat/packets_started
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stat/packets_finished
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stat/kb_written
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stat/kb_read
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stat/kb_read_gather
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write_queue/size
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write_queue/congestion_off
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write_queue/congestion_on
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**********************************************************/
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static ssize_t packets_started_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started);
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}
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static DEVICE_ATTR_RO(packets_started);
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static ssize_t packets_finished_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended);
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}
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static DEVICE_ATTR_RO(packets_finished);
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static ssize_t kb_written_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1);
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}
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static DEVICE_ATTR_RO(kb_written);
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static ssize_t kb_read_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1);
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}
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static DEVICE_ATTR_RO(kb_read);
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static ssize_t kb_read_gather_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1);
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}
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static DEVICE_ATTR_RO(kb_read_gather);
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static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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if (len > 0) {
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pd->stats.pkt_started = 0;
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pd->stats.pkt_ended = 0;
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pd->stats.secs_w = 0;
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pd->stats.secs_rg = 0;
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pd->stats.secs_r = 0;
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}
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return len;
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}
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static DEVICE_ATTR_WO(reset);
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static struct attribute *pkt_stat_attrs[] = {
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&dev_attr_packets_finished.attr,
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&dev_attr_packets_started.attr,
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&dev_attr_kb_read.attr,
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&dev_attr_kb_written.attr,
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&dev_attr_kb_read_gather.attr,
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&dev_attr_reset.attr,
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NULL,
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};
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static const struct attribute_group pkt_stat_group = {
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.name = "stat",
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.attrs = pkt_stat_attrs,
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};
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static ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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int n;
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spin_lock(&pd->lock);
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n = sysfs_emit(buf, "%d\n", pd->bio_queue_size);
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spin_unlock(&pd->lock);
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return n;
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}
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static DEVICE_ATTR_RO(size);
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static void init_write_congestion_marks(int* lo, int* hi)
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{
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if (*hi > 0) {
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*hi = max(*hi, 500);
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*hi = min(*hi, 1000000);
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if (*lo <= 0)
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*lo = *hi - 100;
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else {
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*lo = min(*lo, *hi - 100);
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*lo = max(*lo, 100);
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}
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} else {
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*hi = -1;
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*lo = -1;
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}
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}
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static ssize_t congestion_off_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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int n;
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spin_lock(&pd->lock);
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n = sysfs_emit(buf, "%d\n", pd->write_congestion_off);
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spin_unlock(&pd->lock);
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return n;
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}
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static ssize_t congestion_off_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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int val, ret;
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ret = kstrtoint(buf, 10, &val);
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if (ret)
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return ret;
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spin_lock(&pd->lock);
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pd->write_congestion_off = val;
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init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
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spin_unlock(&pd->lock);
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return len;
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}
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static DEVICE_ATTR_RW(congestion_off);
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static ssize_t congestion_on_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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int n;
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spin_lock(&pd->lock);
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n = sysfs_emit(buf, "%d\n", pd->write_congestion_on);
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spin_unlock(&pd->lock);
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return n;
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}
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static ssize_t congestion_on_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct pktcdvd_device *pd = dev_get_drvdata(dev);
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int val, ret;
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ret = kstrtoint(buf, 10, &val);
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if (ret)
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return ret;
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spin_lock(&pd->lock);
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pd->write_congestion_on = val;
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init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
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spin_unlock(&pd->lock);
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return len;
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}
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static DEVICE_ATTR_RW(congestion_on);
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static struct attribute *pkt_wq_attrs[] = {
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&dev_attr_congestion_on.attr,
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&dev_attr_congestion_off.attr,
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&dev_attr_size.attr,
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NULL,
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};
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static const struct attribute_group pkt_wq_group = {
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.name = "write_queue",
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.attrs = pkt_wq_attrs,
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};
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static const struct attribute_group *pkt_groups[] = {
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&pkt_stat_group,
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&pkt_wq_group,
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NULL,
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};
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static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
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{
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if (class_is_registered(&class_pktcdvd)) {
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pd->dev = device_create_with_groups(&class_pktcdvd, NULL,
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MKDEV(0, 0), pd, pkt_groups,
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"%s", pd->disk->disk_name);
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if (IS_ERR(pd->dev))
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pd->dev = NULL;
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}
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}
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static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
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{
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if (class_is_registered(&class_pktcdvd))
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device_unregister(pd->dev);
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}
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/********************************************************************
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/sys/class/pktcdvd/
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add map block device
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remove unmap packet dev
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device_map show mappings
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*******************************************************************/
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static ssize_t device_map_show(const struct class *c, const struct class_attribute *attr,
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char *data)
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{
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int n = 0;
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int idx;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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for (idx = 0; idx < MAX_WRITERS; idx++) {
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struct pktcdvd_device *pd = pkt_devs[idx];
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if (!pd)
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continue;
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n += sysfs_emit_at(data, n, "%s %u:%u %u:%u\n",
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pd->disk->disk_name,
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MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
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MAJOR(pd->bdev->bd_dev),
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MINOR(pd->bdev->bd_dev));
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}
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mutex_unlock(&ctl_mutex);
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return n;
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}
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static CLASS_ATTR_RO(device_map);
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static ssize_t add_store(const struct class *c, const struct class_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int major, minor;
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if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
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/* pkt_setup_dev() expects caller to hold reference to self */
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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pkt_setup_dev(MKDEV(major, minor), NULL);
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module_put(THIS_MODULE);
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return count;
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}
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return -EINVAL;
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}
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static CLASS_ATTR_WO(add);
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static ssize_t remove_store(const struct class *c, const struct class_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int major, minor;
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if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
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pkt_remove_dev(MKDEV(major, minor));
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return count;
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}
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return -EINVAL;
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}
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static CLASS_ATTR_WO(remove);
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static struct attribute *class_pktcdvd_attrs[] = {
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&class_attr_add.attr,
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&class_attr_remove.attr,
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&class_attr_device_map.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(class_pktcdvd);
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static struct class class_pktcdvd = {
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.name = DRIVER_NAME,
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.class_groups = class_pktcdvd_groups,
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};
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static int pkt_sysfs_init(void)
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{
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/*
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* create control files in sysfs
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* /sys/class/pktcdvd/...
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*/
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return class_register(&class_pktcdvd);
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}
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static void pkt_sysfs_cleanup(void)
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{
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class_unregister(&class_pktcdvd);
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}
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/********************************************************************
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entries in debugfs
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/sys/kernel/debug/pktcdvd[0-7]/
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info
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*******************************************************************/
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static void pkt_count_states(struct pktcdvd_device *pd, int *states)
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{
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struct packet_data *pkt;
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int i;
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for (i = 0; i < PACKET_NUM_STATES; i++)
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states[i] = 0;
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spin_lock(&pd->cdrw.active_list_lock);
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list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
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states[pkt->state]++;
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}
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spin_unlock(&pd->cdrw.active_list_lock);
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}
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static int pkt_seq_show(struct seq_file *m, void *p)
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{
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struct pktcdvd_device *pd = m->private;
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char *msg;
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int states[PACKET_NUM_STATES];
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seq_printf(m, "Writer %s mapped to %pg:\n", pd->disk->disk_name, pd->bdev);
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seq_printf(m, "\nSettings:\n");
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seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
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if (pd->settings.write_type == 0)
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msg = "Packet";
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else
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msg = "Unknown";
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seq_printf(m, "\twrite type:\t\t%s\n", msg);
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seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
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seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
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seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
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if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
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msg = "Mode 1";
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else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
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msg = "Mode 2";
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else
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msg = "Unknown";
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seq_printf(m, "\tblock mode:\t\t%s\n", msg);
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seq_printf(m, "\nStatistics:\n");
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seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
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seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
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seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
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seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
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seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
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seq_printf(m, "\nMisc:\n");
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seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
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seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
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seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
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seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
|
|
seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
|
|
seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
|
|
|
|
seq_printf(m, "\nQueue state:\n");
|
|
seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
|
|
seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
|
|
seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", pd->current_sector);
|
|
|
|
pkt_count_states(pd, states);
|
|
seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
|
|
states[0], states[1], states[2], states[3], states[4], states[5]);
|
|
|
|
seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
|
|
pd->write_congestion_off,
|
|
pd->write_congestion_on);
|
|
return 0;
|
|
}
|
|
DEFINE_SHOW_ATTRIBUTE(pkt_seq);
|
|
|
|
static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
|
|
{
|
|
if (!pkt_debugfs_root)
|
|
return;
|
|
pd->dfs_d_root = debugfs_create_dir(pd->disk->disk_name, pkt_debugfs_root);
|
|
if (!pd->dfs_d_root)
|
|
return;
|
|
|
|
pd->dfs_f_info = debugfs_create_file("info", 0444, pd->dfs_d_root,
|
|
pd, &pkt_seq_fops);
|
|
}
|
|
|
|
static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
|
|
{
|
|
if (!pkt_debugfs_root)
|
|
return;
|
|
debugfs_remove(pd->dfs_f_info);
|
|
debugfs_remove(pd->dfs_d_root);
|
|
pd->dfs_f_info = NULL;
|
|
pd->dfs_d_root = NULL;
|
|
}
|
|
|
|
static void pkt_debugfs_init(void)
|
|
{
|
|
pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
|
|
}
|
|
|
|
static void pkt_debugfs_cleanup(void)
|
|
{
|
|
debugfs_remove(pkt_debugfs_root);
|
|
pkt_debugfs_root = NULL;
|
|
}
|
|
|
|
/* ----------------------------------------------------------*/
|
|
|
|
|
|
static void pkt_bio_finished(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
|
|
if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
|
|
dev_dbg(ddev, "queue empty\n");
|
|
atomic_set(&pd->iosched.attention, 1);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate a packet_data struct
|
|
*/
|
|
static struct packet_data *pkt_alloc_packet_data(int frames)
|
|
{
|
|
int i;
|
|
struct packet_data *pkt;
|
|
|
|
pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
|
|
if (!pkt)
|
|
goto no_pkt;
|
|
|
|
pkt->frames = frames;
|
|
pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL);
|
|
if (!pkt->w_bio)
|
|
goto no_bio;
|
|
|
|
for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
|
|
pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
|
|
if (!pkt->pages[i])
|
|
goto no_page;
|
|
}
|
|
|
|
spin_lock_init(&pkt->lock);
|
|
bio_list_init(&pkt->orig_bios);
|
|
|
|
for (i = 0; i < frames; i++) {
|
|
pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL);
|
|
if (!pkt->r_bios[i])
|
|
goto no_rd_bio;
|
|
}
|
|
|
|
return pkt;
|
|
|
|
no_rd_bio:
|
|
for (i = 0; i < frames; i++)
|
|
kfree(pkt->r_bios[i]);
|
|
no_page:
|
|
for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
|
|
if (pkt->pages[i])
|
|
__free_page(pkt->pages[i]);
|
|
kfree(pkt->w_bio);
|
|
no_bio:
|
|
kfree(pkt);
|
|
no_pkt:
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Free a packet_data struct
|
|
*/
|
|
static void pkt_free_packet_data(struct packet_data *pkt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < pkt->frames; i++)
|
|
kfree(pkt->r_bios[i]);
|
|
for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
|
|
__free_page(pkt->pages[i]);
|
|
kfree(pkt->w_bio);
|
|
kfree(pkt);
|
|
}
|
|
|
|
static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_data *pkt, *next;
|
|
|
|
BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
|
|
|
|
list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
|
|
pkt_free_packet_data(pkt);
|
|
}
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
|
|
}
|
|
|
|
static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
|
|
{
|
|
struct packet_data *pkt;
|
|
|
|
BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
|
|
|
|
while (nr_packets > 0) {
|
|
pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
|
|
if (!pkt) {
|
|
pkt_shrink_pktlist(pd);
|
|
return 0;
|
|
}
|
|
pkt->id = nr_packets;
|
|
pkt->pd = pd;
|
|
list_add(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
nr_packets--;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
|
|
{
|
|
struct rb_node *n = rb_next(&node->rb_node);
|
|
if (!n)
|
|
return NULL;
|
|
return rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
|
|
static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
|
|
{
|
|
rb_erase(&node->rb_node, &pd->bio_queue);
|
|
mempool_free(node, &pd->rb_pool);
|
|
pd->bio_queue_size--;
|
|
BUG_ON(pd->bio_queue_size < 0);
|
|
}
|
|
|
|
/*
|
|
* Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
|
|
*/
|
|
static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
|
|
{
|
|
struct rb_node *n = pd->bio_queue.rb_node;
|
|
struct rb_node *next;
|
|
struct pkt_rb_node *tmp;
|
|
|
|
if (!n) {
|
|
BUG_ON(pd->bio_queue_size > 0);
|
|
return NULL;
|
|
}
|
|
|
|
for (;;) {
|
|
tmp = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
if (s <= tmp->bio->bi_iter.bi_sector)
|
|
next = n->rb_left;
|
|
else
|
|
next = n->rb_right;
|
|
if (!next)
|
|
break;
|
|
n = next;
|
|
}
|
|
|
|
if (s > tmp->bio->bi_iter.bi_sector) {
|
|
tmp = pkt_rbtree_next(tmp);
|
|
if (!tmp)
|
|
return NULL;
|
|
}
|
|
BUG_ON(s > tmp->bio->bi_iter.bi_sector);
|
|
return tmp;
|
|
}
|
|
|
|
/*
|
|
* Insert a node into the pd->bio_queue rb tree.
|
|
*/
|
|
static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
|
|
{
|
|
struct rb_node **p = &pd->bio_queue.rb_node;
|
|
struct rb_node *parent = NULL;
|
|
sector_t s = node->bio->bi_iter.bi_sector;
|
|
struct pkt_rb_node *tmp;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
|
|
if (s < tmp->bio->bi_iter.bi_sector)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
rb_link_node(&node->rb_node, parent, p);
|
|
rb_insert_color(&node->rb_node, &pd->bio_queue);
|
|
pd->bio_queue_size++;
|
|
}
|
|
|
|
/*
|
|
* Send a packet_command to the underlying block device and
|
|
* wait for completion.
|
|
*/
|
|
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(pd->bdev);
|
|
struct scsi_cmnd *scmd;
|
|
struct request *rq;
|
|
int ret = 0;
|
|
|
|
rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
|
|
REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(rq))
|
|
return PTR_ERR(rq);
|
|
scmd = blk_mq_rq_to_pdu(rq);
|
|
|
|
if (cgc->buflen) {
|
|
ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
|
|
GFP_NOIO);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
|
|
memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE);
|
|
|
|
rq->timeout = 60*HZ;
|
|
if (cgc->quiet)
|
|
rq->rq_flags |= RQF_QUIET;
|
|
|
|
blk_execute_rq(rq, false);
|
|
if (scmd->result)
|
|
ret = -EIO;
|
|
out:
|
|
blk_mq_free_request(rq);
|
|
return ret;
|
|
}
|
|
|
|
static const char *sense_key_string(__u8 index)
|
|
{
|
|
static const char * const info[] = {
|
|
"No sense", "Recovered error", "Not ready",
|
|
"Medium error", "Hardware error", "Illegal request",
|
|
"Unit attention", "Data protect", "Blank check",
|
|
};
|
|
|
|
return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
|
|
}
|
|
|
|
/*
|
|
* A generic sense dump / resolve mechanism should be implemented across
|
|
* all ATAPI + SCSI devices.
|
|
*/
|
|
static void pkt_dump_sense(struct pktcdvd_device *pd,
|
|
struct packet_command *cgc)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct scsi_sense_hdr *sshdr = cgc->sshdr;
|
|
|
|
if (sshdr)
|
|
dev_err(ddev, "%*ph - sense %02x.%02x.%02x (%s)\n",
|
|
CDROM_PACKET_SIZE, cgc->cmd,
|
|
sshdr->sense_key, sshdr->asc, sshdr->ascq,
|
|
sense_key_string(sshdr->sense_key));
|
|
else
|
|
dev_err(ddev, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
|
|
}
|
|
|
|
/*
|
|
* flush the drive cache to media
|
|
*/
|
|
static int pkt_flush_cache(struct pktcdvd_device *pd)
|
|
{
|
|
struct packet_command cgc;
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.cmd[0] = GPCMD_FLUSH_CACHE;
|
|
cgc.quiet = 1;
|
|
|
|
/*
|
|
* the IMMED bit -- we default to not setting it, although that
|
|
* would allow a much faster close, this is safer
|
|
*/
|
|
#if 0
|
|
cgc.cmd[1] = 1 << 1;
|
|
#endif
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
/*
|
|
* speed is given as the normal factor, e.g. 4 for 4x
|
|
*/
|
|
static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
|
|
unsigned write_speed, unsigned read_speed)
|
|
{
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
int ret;
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.sshdr = &sshdr;
|
|
cgc.cmd[0] = GPCMD_SET_SPEED;
|
|
put_unaligned_be16(read_speed, &cgc.cmd[2]);
|
|
put_unaligned_be16(write_speed, &cgc.cmd[4]);
|
|
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret)
|
|
pkt_dump_sense(pd, &cgc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Queue a bio for processing by the low-level CD device. Must be called
|
|
* from process context.
|
|
*/
|
|
static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
|
|
{
|
|
spin_lock(&pd->iosched.lock);
|
|
if (bio_data_dir(bio) == READ)
|
|
bio_list_add(&pd->iosched.read_queue, bio);
|
|
else
|
|
bio_list_add(&pd->iosched.write_queue, bio);
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
atomic_set(&pd->iosched.attention, 1);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
|
|
/*
|
|
* Process the queued read/write requests. This function handles special
|
|
* requirements for CDRW drives:
|
|
* - A cache flush command must be inserted before a read request if the
|
|
* previous request was a write.
|
|
* - Switching between reading and writing is slow, so don't do it more often
|
|
* than necessary.
|
|
* - Optimize for throughput at the expense of latency. This means that streaming
|
|
* writes will never be interrupted by a read, but if the drive has to seek
|
|
* before the next write, switch to reading instead if there are any pending
|
|
* read requests.
|
|
* - Set the read speed according to current usage pattern. When only reading
|
|
* from the device, it's best to use the highest possible read speed, but
|
|
* when switching often between reading and writing, it's better to have the
|
|
* same read and write speeds.
|
|
*/
|
|
static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
if (atomic_read(&pd->iosched.attention) == 0)
|
|
return;
|
|
atomic_set(&pd->iosched.attention, 0);
|
|
|
|
for (;;) {
|
|
struct bio *bio;
|
|
int reads_queued, writes_queued;
|
|
|
|
spin_lock(&pd->iosched.lock);
|
|
reads_queued = !bio_list_empty(&pd->iosched.read_queue);
|
|
writes_queued = !bio_list_empty(&pd->iosched.write_queue);
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
if (!reads_queued && !writes_queued)
|
|
break;
|
|
|
|
if (pd->iosched.writing) {
|
|
int need_write_seek = 1;
|
|
spin_lock(&pd->iosched.lock);
|
|
bio = bio_list_peek(&pd->iosched.write_queue);
|
|
spin_unlock(&pd->iosched.lock);
|
|
if (bio && (bio->bi_iter.bi_sector ==
|
|
pd->iosched.last_write))
|
|
need_write_seek = 0;
|
|
if (need_write_seek && reads_queued) {
|
|
if (atomic_read(&pd->cdrw.pending_bios) > 0) {
|
|
dev_dbg(ddev, "write, waiting\n");
|
|
break;
|
|
}
|
|
pkt_flush_cache(pd);
|
|
pd->iosched.writing = 0;
|
|
}
|
|
} else {
|
|
if (!reads_queued && writes_queued) {
|
|
if (atomic_read(&pd->cdrw.pending_bios) > 0) {
|
|
dev_dbg(ddev, "read, waiting\n");
|
|
break;
|
|
}
|
|
pd->iosched.writing = 1;
|
|
}
|
|
}
|
|
|
|
spin_lock(&pd->iosched.lock);
|
|
if (pd->iosched.writing)
|
|
bio = bio_list_pop(&pd->iosched.write_queue);
|
|
else
|
|
bio = bio_list_pop(&pd->iosched.read_queue);
|
|
spin_unlock(&pd->iosched.lock);
|
|
|
|
if (!bio)
|
|
continue;
|
|
|
|
if (bio_data_dir(bio) == READ)
|
|
pd->iosched.successive_reads +=
|
|
bio->bi_iter.bi_size >> 10;
|
|
else {
|
|
pd->iosched.successive_reads = 0;
|
|
pd->iosched.last_write = bio_end_sector(bio);
|
|
}
|
|
if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
|
|
if (pd->read_speed == pd->write_speed) {
|
|
pd->read_speed = MAX_SPEED;
|
|
pkt_set_speed(pd, pd->write_speed, pd->read_speed);
|
|
}
|
|
} else {
|
|
if (pd->read_speed != pd->write_speed) {
|
|
pd->read_speed = pd->write_speed;
|
|
pkt_set_speed(pd, pd->write_speed, pd->read_speed);
|
|
}
|
|
}
|
|
|
|
atomic_inc(&pd->cdrw.pending_bios);
|
|
submit_bio_noacct(bio);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Special care is needed if the underlying block device has a small
|
|
* max_phys_segments value.
|
|
*/
|
|
static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
if ((pd->settings.size << 9) / CD_FRAMESIZE <= queue_max_segments(q)) {
|
|
/*
|
|
* The cdrom device can handle one segment/frame
|
|
*/
|
|
clear_bit(PACKET_MERGE_SEGS, &pd->flags);
|
|
return 0;
|
|
}
|
|
|
|
if ((pd->settings.size << 9) / PAGE_SIZE <= queue_max_segments(q)) {
|
|
/*
|
|
* We can handle this case at the expense of some extra memory
|
|
* copies during write operations
|
|
*/
|
|
set_bit(PACKET_MERGE_SEGS, &pd->flags);
|
|
return 0;
|
|
}
|
|
|
|
dev_err(ddev, "cdrom max_phys_segments too small\n");
|
|
return -EIO;
|
|
}
|
|
|
|
static void pkt_end_io_read(struct bio *bio)
|
|
{
|
|
struct packet_data *pkt = bio->bi_private;
|
|
struct pktcdvd_device *pd = pkt->pd;
|
|
BUG_ON(!pd);
|
|
|
|
dev_dbg(disk_to_dev(pd->disk), "bio=%p sec0=%llx sec=%llx err=%d\n",
|
|
bio, pkt->sector, bio->bi_iter.bi_sector, bio->bi_status);
|
|
|
|
if (bio->bi_status)
|
|
atomic_inc(&pkt->io_errors);
|
|
bio_uninit(bio);
|
|
if (atomic_dec_and_test(&pkt->io_wait)) {
|
|
atomic_inc(&pkt->run_sm);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
pkt_bio_finished(pd);
|
|
}
|
|
|
|
static void pkt_end_io_packet_write(struct bio *bio)
|
|
{
|
|
struct packet_data *pkt = bio->bi_private;
|
|
struct pktcdvd_device *pd = pkt->pd;
|
|
BUG_ON(!pd);
|
|
|
|
dev_dbg(disk_to_dev(pd->disk), "id=%d, err=%d\n", pkt->id, bio->bi_status);
|
|
|
|
pd->stats.pkt_ended++;
|
|
|
|
bio_uninit(bio);
|
|
pkt_bio_finished(pd);
|
|
atomic_dec(&pkt->io_wait);
|
|
atomic_inc(&pkt->run_sm);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
|
|
/*
|
|
* Schedule reads for the holes in a packet
|
|
*/
|
|
static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int frames_read = 0;
|
|
struct bio *bio;
|
|
int f;
|
|
char written[PACKET_MAX_SIZE];
|
|
|
|
BUG_ON(bio_list_empty(&pkt->orig_bios));
|
|
|
|
atomic_set(&pkt->io_wait, 0);
|
|
atomic_set(&pkt->io_errors, 0);
|
|
|
|
/*
|
|
* Figure out which frames we need to read before we can write.
|
|
*/
|
|
memset(written, 0, sizeof(written));
|
|
spin_lock(&pkt->lock);
|
|
bio_list_for_each(bio, &pkt->orig_bios) {
|
|
int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
|
|
(CD_FRAMESIZE >> 9);
|
|
int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
|
|
pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
|
|
BUG_ON(first_frame < 0);
|
|
BUG_ON(first_frame + num_frames > pkt->frames);
|
|
for (f = first_frame; f < first_frame + num_frames; f++)
|
|
written[f] = 1;
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
|
|
if (pkt->cache_valid) {
|
|
dev_dbg(ddev, "zone %llx cached\n", pkt->sector);
|
|
goto out_account;
|
|
}
|
|
|
|
/*
|
|
* Schedule reads for missing parts of the packet.
|
|
*/
|
|
for (f = 0; f < pkt->frames; f++) {
|
|
int p, offset;
|
|
|
|
if (written[f])
|
|
continue;
|
|
|
|
bio = pkt->r_bios[f];
|
|
bio_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ);
|
|
bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
|
|
bio->bi_end_io = pkt_end_io_read;
|
|
bio->bi_private = pkt;
|
|
|
|
p = (f * CD_FRAMESIZE) / PAGE_SIZE;
|
|
offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
|
|
dev_dbg(ddev, "Adding frame %d, page:%p offs:%d\n", f,
|
|
pkt->pages[p], offset);
|
|
if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
|
|
BUG();
|
|
|
|
atomic_inc(&pkt->io_wait);
|
|
pkt_queue_bio(pd, bio);
|
|
frames_read++;
|
|
}
|
|
|
|
out_account:
|
|
dev_dbg(ddev, "need %d frames for zone %llx\n", frames_read, pkt->sector);
|
|
pd->stats.pkt_started++;
|
|
pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
|
|
}
|
|
|
|
/*
|
|
* Find a packet matching zone, or the least recently used packet if
|
|
* there is no match.
|
|
*/
|
|
static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
|
|
{
|
|
struct packet_data *pkt;
|
|
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
|
|
if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
|
|
list_del_init(&pkt->list);
|
|
if (pkt->sector != zone)
|
|
pkt->cache_valid = 0;
|
|
return pkt;
|
|
}
|
|
}
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
|
|
static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
if (pkt->cache_valid) {
|
|
list_add(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
} else {
|
|
list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
|
|
}
|
|
}
|
|
|
|
static inline void pkt_set_state(struct device *ddev, struct packet_data *pkt,
|
|
enum packet_data_state state)
|
|
{
|
|
static const char *state_name[] = {
|
|
"IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
|
|
};
|
|
enum packet_data_state old_state = pkt->state;
|
|
|
|
dev_dbg(ddev, "pkt %2d : s=%6llx %s -> %s\n",
|
|
pkt->id, pkt->sector, state_name[old_state], state_name[state]);
|
|
|
|
pkt->state = state;
|
|
}
|
|
|
|
/*
|
|
* Scan the work queue to see if we can start a new packet.
|
|
* returns non-zero if any work was done.
|
|
*/
|
|
static int pkt_handle_queue(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_data *pkt, *p;
|
|
struct bio *bio = NULL;
|
|
sector_t zone = 0; /* Suppress gcc warning */
|
|
struct pkt_rb_node *node, *first_node;
|
|
struct rb_node *n;
|
|
|
|
atomic_set(&pd->scan_queue, 0);
|
|
|
|
if (list_empty(&pd->cdrw.pkt_free_list)) {
|
|
dev_dbg(ddev, "no pkt\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to find a zone we are not already working on.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
first_node = pkt_rbtree_find(pd, pd->current_sector);
|
|
if (!first_node) {
|
|
n = rb_first(&pd->bio_queue);
|
|
if (n)
|
|
first_node = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
node = first_node;
|
|
while (node) {
|
|
bio = node->bio;
|
|
zone = get_zone(bio->bi_iter.bi_sector, pd);
|
|
list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
|
|
if (p->sector == zone) {
|
|
bio = NULL;
|
|
goto try_next_bio;
|
|
}
|
|
}
|
|
break;
|
|
try_next_bio:
|
|
node = pkt_rbtree_next(node);
|
|
if (!node) {
|
|
n = rb_first(&pd->bio_queue);
|
|
if (n)
|
|
node = rb_entry(n, struct pkt_rb_node, rb_node);
|
|
}
|
|
if (node == first_node)
|
|
node = NULL;
|
|
}
|
|
spin_unlock(&pd->lock);
|
|
if (!bio) {
|
|
dev_dbg(ddev, "no bio\n");
|
|
return 0;
|
|
}
|
|
|
|
pkt = pkt_get_packet_data(pd, zone);
|
|
|
|
pd->current_sector = zone + pd->settings.size;
|
|
pkt->sector = zone;
|
|
BUG_ON(pkt->frames != pd->settings.size >> 2);
|
|
pkt->write_size = 0;
|
|
|
|
/*
|
|
* Scan work queue for bios in the same zone and link them
|
|
* to this packet.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
dev_dbg(ddev, "looking for zone %llx\n", zone);
|
|
while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
|
|
sector_t tmp = get_zone(node->bio->bi_iter.bi_sector, pd);
|
|
|
|
bio = node->bio;
|
|
dev_dbg(ddev, "found zone=%llx\n", tmp);
|
|
if (tmp != zone)
|
|
break;
|
|
pkt_rbtree_erase(pd, node);
|
|
spin_lock(&pkt->lock);
|
|
bio_list_add(&pkt->orig_bios, bio);
|
|
pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
|
|
spin_unlock(&pkt->lock);
|
|
}
|
|
/* check write congestion marks, and if bio_queue_size is
|
|
* below, wake up any waiters
|
|
*/
|
|
if (pd->congested &&
|
|
pd->bio_queue_size <= pd->write_congestion_off) {
|
|
pd->congested = false;
|
|
wake_up_var(&pd->congested);
|
|
}
|
|
spin_unlock(&pd->lock);
|
|
|
|
pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
|
|
pkt_set_state(ddev, pkt, PACKET_WAITING_STATE);
|
|
atomic_set(&pkt->run_sm, 1);
|
|
|
|
spin_lock(&pd->cdrw.active_list_lock);
|
|
list_add(&pkt->list, &pd->cdrw.pkt_active_list);
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* bio_list_copy_data - copy contents of data buffers from one chain of bios to
|
|
* another
|
|
* @src: source bio list
|
|
* @dst: destination bio list
|
|
*
|
|
* Stops when it reaches the end of either the @src list or @dst list - that is,
|
|
* copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of
|
|
* bios).
|
|
*/
|
|
static void bio_list_copy_data(struct bio *dst, struct bio *src)
|
|
{
|
|
struct bvec_iter src_iter = src->bi_iter;
|
|
struct bvec_iter dst_iter = dst->bi_iter;
|
|
|
|
while (1) {
|
|
if (!src_iter.bi_size) {
|
|
src = src->bi_next;
|
|
if (!src)
|
|
break;
|
|
|
|
src_iter = src->bi_iter;
|
|
}
|
|
|
|
if (!dst_iter.bi_size) {
|
|
dst = dst->bi_next;
|
|
if (!dst)
|
|
break;
|
|
|
|
dst_iter = dst->bi_iter;
|
|
}
|
|
|
|
bio_copy_data_iter(dst, &dst_iter, src, &src_iter);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Assemble a bio to write one packet and queue the bio for processing
|
|
* by the underlying block device.
|
|
*/
|
|
static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int f;
|
|
|
|
bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames,
|
|
REQ_OP_WRITE);
|
|
pkt->w_bio->bi_iter.bi_sector = pkt->sector;
|
|
pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
|
|
pkt->w_bio->bi_private = pkt;
|
|
|
|
/* XXX: locking? */
|
|
for (f = 0; f < pkt->frames; f++) {
|
|
struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
|
|
unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
|
|
|
|
if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
|
|
BUG();
|
|
}
|
|
dev_dbg(ddev, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
|
|
|
|
/*
|
|
* Fill-in bvec with data from orig_bios.
|
|
*/
|
|
spin_lock(&pkt->lock);
|
|
bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
|
|
|
|
pkt_set_state(ddev, pkt, PACKET_WRITE_WAIT_STATE);
|
|
spin_unlock(&pkt->lock);
|
|
|
|
dev_dbg(ddev, "Writing %d frames for zone %llx\n", pkt->write_size, pkt->sector);
|
|
|
|
if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
|
|
pkt->cache_valid = 1;
|
|
else
|
|
pkt->cache_valid = 0;
|
|
|
|
/* Start the write request */
|
|
atomic_set(&pkt->io_wait, 1);
|
|
pkt_queue_bio(pd, pkt->w_bio);
|
|
}
|
|
|
|
static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
|
|
{
|
|
struct bio *bio;
|
|
|
|
if (status)
|
|
pkt->cache_valid = 0;
|
|
|
|
/* Finish all bios corresponding to this packet */
|
|
while ((bio = bio_list_pop(&pkt->orig_bios))) {
|
|
bio->bi_status = status;
|
|
bio_endio(bio);
|
|
}
|
|
}
|
|
|
|
static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
dev_dbg(ddev, "pkt %d\n", pkt->id);
|
|
|
|
for (;;) {
|
|
switch (pkt->state) {
|
|
case PACKET_WAITING_STATE:
|
|
if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
|
|
return;
|
|
|
|
pkt->sleep_time = 0;
|
|
pkt_gather_data(pd, pkt);
|
|
pkt_set_state(ddev, pkt, PACKET_READ_WAIT_STATE);
|
|
break;
|
|
|
|
case PACKET_READ_WAIT_STATE:
|
|
if (atomic_read(&pkt->io_wait) > 0)
|
|
return;
|
|
|
|
if (atomic_read(&pkt->io_errors) > 0) {
|
|
pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE);
|
|
} else {
|
|
pkt_start_write(pd, pkt);
|
|
}
|
|
break;
|
|
|
|
case PACKET_WRITE_WAIT_STATE:
|
|
if (atomic_read(&pkt->io_wait) > 0)
|
|
return;
|
|
|
|
if (!pkt->w_bio->bi_status) {
|
|
pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE);
|
|
} else {
|
|
pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE);
|
|
}
|
|
break;
|
|
|
|
case PACKET_RECOVERY_STATE:
|
|
dev_dbg(ddev, "No recovery possible\n");
|
|
pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE);
|
|
break;
|
|
|
|
case PACKET_FINISHED_STATE:
|
|
pkt_finish_packet(pkt, pkt->w_bio->bi_status);
|
|
return;
|
|
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pkt_handle_packets(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_data *pkt, *next;
|
|
|
|
/*
|
|
* Run state machine for active packets
|
|
*/
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (atomic_read(&pkt->run_sm) > 0) {
|
|
atomic_set(&pkt->run_sm, 0);
|
|
pkt_run_state_machine(pd, pkt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Move no longer active packets to the free list
|
|
*/
|
|
spin_lock(&pd->cdrw.active_list_lock);
|
|
list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
|
|
if (pkt->state == PACKET_FINISHED_STATE) {
|
|
list_del(&pkt->list);
|
|
pkt_put_packet_data(pd, pkt);
|
|
pkt_set_state(ddev, pkt, PACKET_IDLE_STATE);
|
|
atomic_set(&pd->scan_queue, 1);
|
|
}
|
|
}
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
}
|
|
|
|
/*
|
|
* kcdrwd is woken up when writes have been queued for one of our
|
|
* registered devices
|
|
*/
|
|
static int kcdrwd(void *foobar)
|
|
{
|
|
struct pktcdvd_device *pd = foobar;
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_data *pkt;
|
|
int states[PACKET_NUM_STATES];
|
|
long min_sleep_time, residue;
|
|
|
|
set_user_nice(current, MIN_NICE);
|
|
set_freezable();
|
|
|
|
for (;;) {
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
/*
|
|
* Wait until there is something to do
|
|
*/
|
|
add_wait_queue(&pd->wqueue, &wait);
|
|
for (;;) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
/* Check if we need to run pkt_handle_queue */
|
|
if (atomic_read(&pd->scan_queue) > 0)
|
|
goto work_to_do;
|
|
|
|
/* Check if we need to run the state machine for some packet */
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (atomic_read(&pkt->run_sm) > 0)
|
|
goto work_to_do;
|
|
}
|
|
|
|
/* Check if we need to process the iosched queues */
|
|
if (atomic_read(&pd->iosched.attention) != 0)
|
|
goto work_to_do;
|
|
|
|
/* Otherwise, go to sleep */
|
|
pkt_count_states(pd, states);
|
|
dev_dbg(ddev, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
|
|
states[0], states[1], states[2], states[3], states[4], states[5]);
|
|
|
|
min_sleep_time = MAX_SCHEDULE_TIMEOUT;
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
|
|
min_sleep_time = pkt->sleep_time;
|
|
}
|
|
|
|
dev_dbg(ddev, "sleeping\n");
|
|
residue = schedule_timeout(min_sleep_time);
|
|
dev_dbg(ddev, "wake up\n");
|
|
|
|
/* make swsusp happy with our thread */
|
|
try_to_freeze();
|
|
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (!pkt->sleep_time)
|
|
continue;
|
|
pkt->sleep_time -= min_sleep_time - residue;
|
|
if (pkt->sleep_time <= 0) {
|
|
pkt->sleep_time = 0;
|
|
atomic_inc(&pkt->run_sm);
|
|
}
|
|
}
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
}
|
|
work_to_do:
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&pd->wqueue, &wait);
|
|
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
/*
|
|
* if pkt_handle_queue returns true, we can queue
|
|
* another request.
|
|
*/
|
|
while (pkt_handle_queue(pd))
|
|
;
|
|
|
|
/*
|
|
* Handle packet state machine
|
|
*/
|
|
pkt_handle_packets(pd);
|
|
|
|
/*
|
|
* Handle iosched queues
|
|
*/
|
|
pkt_iosched_process_queue(pd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pkt_print_settings(struct pktcdvd_device *pd)
|
|
{
|
|
dev_info(disk_to_dev(pd->disk), "%s packets, %u blocks, Mode-%c disc\n",
|
|
pd->settings.fp ? "Fixed" : "Variable",
|
|
pd->settings.size >> 2,
|
|
pd->settings.block_mode == 8 ? '1' : '2');
|
|
}
|
|
|
|
static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
|
|
{
|
|
memset(cgc->cmd, 0, sizeof(cgc->cmd));
|
|
|
|
cgc->cmd[0] = GPCMD_MODE_SENSE_10;
|
|
cgc->cmd[2] = page_code | (page_control << 6);
|
|
put_unaligned_be16(cgc->buflen, &cgc->cmd[7]);
|
|
cgc->data_direction = CGC_DATA_READ;
|
|
return pkt_generic_packet(pd, cgc);
|
|
}
|
|
|
|
static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
|
|
{
|
|
memset(cgc->cmd, 0, sizeof(cgc->cmd));
|
|
memset(cgc->buffer, 0, 2);
|
|
cgc->cmd[0] = GPCMD_MODE_SELECT_10;
|
|
cgc->cmd[1] = 0x10; /* PF */
|
|
put_unaligned_be16(cgc->buflen, &cgc->cmd[7]);
|
|
cgc->data_direction = CGC_DATA_WRITE;
|
|
return pkt_generic_packet(pd, cgc);
|
|
}
|
|
|
|
static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
|
|
{
|
|
struct packet_command cgc;
|
|
int ret;
|
|
|
|
/* set up command and get the disc info */
|
|
init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
|
|
cgc.cmd[0] = GPCMD_READ_DISC_INFO;
|
|
cgc.cmd[8] = cgc.buflen = 2;
|
|
cgc.quiet = 1;
|
|
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* not all drives have the same disc_info length, so requeue
|
|
* packet with the length the drive tells us it can supply
|
|
*/
|
|
cgc.buflen = be16_to_cpu(di->disc_information_length) +
|
|
sizeof(di->disc_information_length);
|
|
|
|
if (cgc.buflen > sizeof(disc_information))
|
|
cgc.buflen = sizeof(disc_information);
|
|
|
|
cgc.cmd[8] = cgc.buflen;
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
|
|
{
|
|
struct packet_command cgc;
|
|
int ret;
|
|
|
|
init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
|
|
cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
|
|
cgc.cmd[1] = type & 3;
|
|
put_unaligned_be16(track, &cgc.cmd[4]);
|
|
cgc.cmd[8] = 8;
|
|
cgc.quiet = 1;
|
|
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cgc.buflen = be16_to_cpu(ti->track_information_length) +
|
|
sizeof(ti->track_information_length);
|
|
|
|
if (cgc.buflen > sizeof(track_information))
|
|
cgc.buflen = sizeof(track_information);
|
|
|
|
cgc.cmd[8] = cgc.buflen;
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
|
|
long *last_written)
|
|
{
|
|
disc_information di;
|
|
track_information ti;
|
|
__u32 last_track;
|
|
int ret;
|
|
|
|
ret = pkt_get_disc_info(pd, &di);
|
|
if (ret)
|
|
return ret;
|
|
|
|
last_track = (di.last_track_msb << 8) | di.last_track_lsb;
|
|
ret = pkt_get_track_info(pd, last_track, 1, &ti);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* if this track is blank, try the previous. */
|
|
if (ti.blank) {
|
|
last_track--;
|
|
ret = pkt_get_track_info(pd, last_track, 1, &ti);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* if last recorded field is valid, return it. */
|
|
if (ti.lra_v) {
|
|
*last_written = be32_to_cpu(ti.last_rec_address);
|
|
} else {
|
|
/* make it up instead */
|
|
*last_written = be32_to_cpu(ti.track_start) +
|
|
be32_to_cpu(ti.track_size);
|
|
if (ti.free_blocks)
|
|
*last_written -= (be32_to_cpu(ti.free_blocks) + 7);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* write mode select package based on pd->settings
|
|
*/
|
|
static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
write_param_page *wp;
|
|
char buffer[128];
|
|
int ret, size;
|
|
|
|
/* doesn't apply to DVD+RW or DVD-RAM */
|
|
if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
|
|
return 0;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
|
|
cgc.sshdr = &sshdr;
|
|
ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
|
|
size = 2 + get_unaligned_be16(&buffer[0]);
|
|
pd->mode_offset = get_unaligned_be16(&buffer[6]);
|
|
if (size > sizeof(buffer))
|
|
size = sizeof(buffer);
|
|
|
|
/*
|
|
* now get it all
|
|
*/
|
|
init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
|
|
cgc.sshdr = &sshdr;
|
|
ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* write page is offset header + block descriptor length
|
|
*/
|
|
wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
|
|
|
|
wp->fp = pd->settings.fp;
|
|
wp->track_mode = pd->settings.track_mode;
|
|
wp->write_type = pd->settings.write_type;
|
|
wp->data_block_type = pd->settings.block_mode;
|
|
|
|
wp->multi_session = 0;
|
|
|
|
#ifdef PACKET_USE_LS
|
|
wp->link_size = 7;
|
|
wp->ls_v = 1;
|
|
#endif
|
|
|
|
if (wp->data_block_type == PACKET_BLOCK_MODE1) {
|
|
wp->session_format = 0;
|
|
wp->subhdr2 = 0x20;
|
|
} else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
|
|
wp->session_format = 0x20;
|
|
wp->subhdr2 = 8;
|
|
#if 0
|
|
wp->mcn[0] = 0x80;
|
|
memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
|
|
#endif
|
|
} else {
|
|
/*
|
|
* paranoia
|
|
*/
|
|
dev_err(ddev, "write mode wrong %d\n", wp->data_block_type);
|
|
return 1;
|
|
}
|
|
wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
|
|
|
|
cgc.buflen = cgc.cmd[8] = size;
|
|
ret = pkt_mode_select(pd, &cgc);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
|
|
pkt_print_settings(pd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 1 -- we can write to this track, 0 -- we can't
|
|
*/
|
|
static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
switch (pd->mmc3_profile) {
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x12: /* DVD-RAM */
|
|
/* The track is always writable on DVD+RW/DVD-RAM */
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!ti->packet || !ti->fp)
|
|
return 0;
|
|
|
|
/*
|
|
* "good" settings as per Mt Fuji.
|
|
*/
|
|
if (ti->rt == 0 && ti->blank == 0)
|
|
return 1;
|
|
|
|
if (ti->rt == 0 && ti->blank == 1)
|
|
return 1;
|
|
|
|
if (ti->rt == 1 && ti->blank == 0)
|
|
return 1;
|
|
|
|
dev_err(ddev, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 1 -- we can write to this disc, 0 -- we can't
|
|
*/
|
|
static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
switch (pd->mmc3_profile) {
|
|
case 0x0a: /* CD-RW */
|
|
case 0xffff: /* MMC3 not supported */
|
|
break;
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x13: /* DVD-RW */
|
|
case 0x12: /* DVD-RAM */
|
|
return 1;
|
|
default:
|
|
dev_dbg(ddev, "Wrong disc profile (%x)\n", pd->mmc3_profile);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* for disc type 0xff we should probably reserve a new track.
|
|
* but i'm not sure, should we leave this to user apps? probably.
|
|
*/
|
|
if (di->disc_type == 0xff) {
|
|
dev_notice(ddev, "unknown disc - no track?\n");
|
|
return 0;
|
|
}
|
|
|
|
if (di->disc_type != 0x20 && di->disc_type != 0) {
|
|
dev_err(ddev, "wrong disc type (%x)\n", di->disc_type);
|
|
return 0;
|
|
}
|
|
|
|
if (di->erasable == 0) {
|
|
dev_err(ddev, "disc not erasable\n");
|
|
return 0;
|
|
}
|
|
|
|
if (di->border_status == PACKET_SESSION_RESERVED) {
|
|
dev_err(ddev, "can't write to last track (reserved)\n");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_command cgc;
|
|
unsigned char buf[12];
|
|
disc_information di;
|
|
track_information ti;
|
|
int ret, track;
|
|
|
|
init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
|
|
cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
|
|
cgc.cmd[8] = 8;
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
pd->mmc3_profile = ret ? 0xffff : get_unaligned_be16(&buf[6]);
|
|
|
|
memset(&di, 0, sizeof(disc_information));
|
|
memset(&ti, 0, sizeof(track_information));
|
|
|
|
ret = pkt_get_disc_info(pd, &di);
|
|
if (ret) {
|
|
dev_err(ddev, "failed get_disc\n");
|
|
return ret;
|
|
}
|
|
|
|
if (!pkt_writable_disc(pd, &di))
|
|
return -EROFS;
|
|
|
|
pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
|
|
|
|
track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
|
|
ret = pkt_get_track_info(pd, track, 1, &ti);
|
|
if (ret) {
|
|
dev_err(ddev, "failed get_track\n");
|
|
return ret;
|
|
}
|
|
|
|
if (!pkt_writable_track(pd, &ti)) {
|
|
dev_err(ddev, "can't write to this track\n");
|
|
return -EROFS;
|
|
}
|
|
|
|
/*
|
|
* we keep packet size in 512 byte units, makes it easier to
|
|
* deal with request calculations.
|
|
*/
|
|
pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
|
|
if (pd->settings.size == 0) {
|
|
dev_notice(ddev, "detected zero packet size!\n");
|
|
return -ENXIO;
|
|
}
|
|
if (pd->settings.size > PACKET_MAX_SECTORS) {
|
|
dev_err(ddev, "packet size is too big\n");
|
|
return -EROFS;
|
|
}
|
|
pd->settings.fp = ti.fp;
|
|
pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
|
|
|
|
if (ti.nwa_v) {
|
|
pd->nwa = be32_to_cpu(ti.next_writable);
|
|
set_bit(PACKET_NWA_VALID, &pd->flags);
|
|
}
|
|
|
|
/*
|
|
* in theory we could use lra on -RW media as well and just zero
|
|
* blocks that haven't been written yet, but in practice that
|
|
* is just a no-go. we'll use that for -R, naturally.
|
|
*/
|
|
if (ti.lra_v) {
|
|
pd->lra = be32_to_cpu(ti.last_rec_address);
|
|
set_bit(PACKET_LRA_VALID, &pd->flags);
|
|
} else {
|
|
pd->lra = 0xffffffff;
|
|
set_bit(PACKET_LRA_VALID, &pd->flags);
|
|
}
|
|
|
|
/*
|
|
* fine for now
|
|
*/
|
|
pd->settings.link_loss = 7;
|
|
pd->settings.write_type = 0; /* packet */
|
|
pd->settings.track_mode = ti.track_mode;
|
|
|
|
/*
|
|
* mode1 or mode2 disc
|
|
*/
|
|
switch (ti.data_mode) {
|
|
case PACKET_MODE1:
|
|
pd->settings.block_mode = PACKET_BLOCK_MODE1;
|
|
break;
|
|
case PACKET_MODE2:
|
|
pd->settings.block_mode = PACKET_BLOCK_MODE2;
|
|
break;
|
|
default:
|
|
dev_err(ddev, "unknown data mode\n");
|
|
return -EROFS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* enable/disable write caching on drive
|
|
*/
|
|
static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
unsigned char buf[64];
|
|
bool set = IS_ENABLED(CONFIG_CDROM_PKTCDVD_WCACHE);
|
|
int ret;
|
|
|
|
init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
|
|
cgc.sshdr = &sshdr;
|
|
cgc.buflen = pd->mode_offset + 12;
|
|
|
|
/*
|
|
* caching mode page might not be there, so quiet this command
|
|
*/
|
|
cgc.quiet = 1;
|
|
|
|
ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* use drive write caching -- we need deferred error handling to be
|
|
* able to successfully recover with this option (drive will return good
|
|
* status as soon as the cdb is validated).
|
|
*/
|
|
buf[pd->mode_offset + 10] |= (set << 2);
|
|
|
|
cgc.buflen = cgc.cmd[8] = 2 + get_unaligned_be16(&buf[0]);
|
|
ret = pkt_mode_select(pd, &cgc);
|
|
if (ret) {
|
|
dev_err(ddev, "write caching control failed\n");
|
|
pkt_dump_sense(pd, &cgc);
|
|
} else if (!ret && set)
|
|
dev_notice(ddev, "enabled write caching\n");
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
|
|
{
|
|
struct packet_command cgc;
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
|
|
cgc.cmd[4] = lockflag ? 1 : 0;
|
|
return pkt_generic_packet(pd, &cgc);
|
|
}
|
|
|
|
/*
|
|
* Returns drive maximum write speed
|
|
*/
|
|
static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
|
|
unsigned *write_speed)
|
|
{
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
unsigned char buf[256+18];
|
|
unsigned char *cap_buf;
|
|
int ret, offset;
|
|
|
|
cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
|
|
init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
|
|
cgc.sshdr = &sshdr;
|
|
|
|
ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
|
|
if (ret) {
|
|
cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
|
|
sizeof(struct mode_page_header);
|
|
ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
offset = 20; /* Obsoleted field, used by older drives */
|
|
if (cap_buf[1] >= 28)
|
|
offset = 28; /* Current write speed selected */
|
|
if (cap_buf[1] >= 30) {
|
|
/* If the drive reports at least one "Logical Unit Write
|
|
* Speed Performance Descriptor Block", use the information
|
|
* in the first block. (contains the highest speed)
|
|
*/
|
|
int num_spdb = get_unaligned_be16(&cap_buf[30]);
|
|
if (num_spdb > 0)
|
|
offset = 34;
|
|
}
|
|
|
|
*write_speed = get_unaligned_be16(&cap_buf[offset]);
|
|
return 0;
|
|
}
|
|
|
|
/* These tables from cdrecord - I don't have orange book */
|
|
/* standard speed CD-RW (1-4x) */
|
|
static char clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
/* high speed CD-RW (-10x) */
|
|
static char hs_clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
/* ultra high speed CD-RW */
|
|
static char us_clv_to_speed[16] = {
|
|
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
|
|
0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
|
|
};
|
|
|
|
/*
|
|
* reads the maximum media speed from ATIP
|
|
*/
|
|
static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
|
|
unsigned *speed)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
unsigned char buf[64];
|
|
unsigned int size, st, sp;
|
|
int ret;
|
|
|
|
init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
|
|
cgc.sshdr = &sshdr;
|
|
cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
|
|
cgc.cmd[1] = 2;
|
|
cgc.cmd[2] = 4; /* READ ATIP */
|
|
cgc.cmd[8] = 2;
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
size = 2 + get_unaligned_be16(&buf[0]);
|
|
if (size > sizeof(buf))
|
|
size = sizeof(buf);
|
|
|
|
init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
|
|
cgc.sshdr = &sshdr;
|
|
cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
|
|
cgc.cmd[1] = 2;
|
|
cgc.cmd[2] = 4;
|
|
cgc.cmd[8] = size;
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret) {
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
|
|
if (!(buf[6] & 0x40)) {
|
|
dev_notice(ddev, "disc type is not CD-RW\n");
|
|
return 1;
|
|
}
|
|
if (!(buf[6] & 0x4)) {
|
|
dev_notice(ddev, "A1 values on media are not valid, maybe not CDRW?\n");
|
|
return 1;
|
|
}
|
|
|
|
st = (buf[6] >> 3) & 0x7; /* disc sub-type */
|
|
|
|
sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
|
|
|
|
/* Info from cdrecord */
|
|
switch (st) {
|
|
case 0: /* standard speed */
|
|
*speed = clv_to_speed[sp];
|
|
break;
|
|
case 1: /* high speed */
|
|
*speed = hs_clv_to_speed[sp];
|
|
break;
|
|
case 2: /* ultra high speed */
|
|
*speed = us_clv_to_speed[sp];
|
|
break;
|
|
default:
|
|
dev_notice(ddev, "unknown disc sub-type %d\n", st);
|
|
return 1;
|
|
}
|
|
if (*speed) {
|
|
dev_info(ddev, "maximum media speed: %d\n", *speed);
|
|
return 0;
|
|
} else {
|
|
dev_notice(ddev, "unknown speed %d for sub-type %d\n", sp, st);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct packet_command cgc;
|
|
struct scsi_sense_hdr sshdr;
|
|
int ret;
|
|
|
|
dev_dbg(ddev, "Performing OPC\n");
|
|
|
|
init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
|
|
cgc.sshdr = &sshdr;
|
|
cgc.timeout = 60*HZ;
|
|
cgc.cmd[0] = GPCMD_SEND_OPC;
|
|
cgc.cmd[1] = 1;
|
|
ret = pkt_generic_packet(pd, &cgc);
|
|
if (ret)
|
|
pkt_dump_sense(pd, &cgc);
|
|
return ret;
|
|
}
|
|
|
|
static int pkt_open_write(struct pktcdvd_device *pd)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int ret;
|
|
unsigned int write_speed, media_write_speed, read_speed;
|
|
|
|
ret = pkt_probe_settings(pd);
|
|
if (ret) {
|
|
dev_dbg(ddev, "failed probe\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = pkt_set_write_settings(pd);
|
|
if (ret) {
|
|
dev_notice(ddev, "failed saving write settings\n");
|
|
return -EIO;
|
|
}
|
|
|
|
pkt_write_caching(pd);
|
|
|
|
ret = pkt_get_max_speed(pd, &write_speed);
|
|
if (ret)
|
|
write_speed = 16 * 177;
|
|
switch (pd->mmc3_profile) {
|
|
case 0x13: /* DVD-RW */
|
|
case 0x1a: /* DVD+RW */
|
|
case 0x12: /* DVD-RAM */
|
|
dev_notice(ddev, "write speed %ukB/s\n", write_speed);
|
|
break;
|
|
default:
|
|
ret = pkt_media_speed(pd, &media_write_speed);
|
|
if (ret)
|
|
media_write_speed = 16;
|
|
write_speed = min(write_speed, media_write_speed * 177);
|
|
dev_notice(ddev, "write speed %ux\n", write_speed / 176);
|
|
break;
|
|
}
|
|
read_speed = write_speed;
|
|
|
|
ret = pkt_set_speed(pd, write_speed, read_speed);
|
|
if (ret) {
|
|
dev_notice(ddev, "couldn't set write speed\n");
|
|
return -EIO;
|
|
}
|
|
pd->write_speed = write_speed;
|
|
pd->read_speed = read_speed;
|
|
|
|
ret = pkt_perform_opc(pd);
|
|
if (ret)
|
|
dev_notice(ddev, "Optimum Power Calibration failed\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* called at open time.
|
|
*/
|
|
static int pkt_open_dev(struct pktcdvd_device *pd, bool write)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int ret;
|
|
long lba;
|
|
struct request_queue *q;
|
|
struct block_device *bdev;
|
|
|
|
/*
|
|
* We need to re-open the cdrom device without O_NONBLOCK to be able
|
|
* to read/write from/to it. It is already opened in O_NONBLOCK mode
|
|
* so open should not fail.
|
|
*/
|
|
bdev = blkdev_get_by_dev(pd->bdev->bd_dev, BLK_OPEN_READ, pd, NULL);
|
|
if (IS_ERR(bdev)) {
|
|
ret = PTR_ERR(bdev);
|
|
goto out;
|
|
}
|
|
|
|
ret = pkt_get_last_written(pd, &lba);
|
|
if (ret) {
|
|
dev_err(ddev, "pkt_get_last_written failed\n");
|
|
goto out_putdev;
|
|
}
|
|
|
|
set_capacity(pd->disk, lba << 2);
|
|
set_capacity_and_notify(pd->bdev->bd_disk, lba << 2);
|
|
|
|
q = bdev_get_queue(pd->bdev);
|
|
if (write) {
|
|
ret = pkt_open_write(pd);
|
|
if (ret)
|
|
goto out_putdev;
|
|
/*
|
|
* Some CDRW drives can not handle writes larger than one packet,
|
|
* even if the size is a multiple of the packet size.
|
|
*/
|
|
blk_queue_max_hw_sectors(q, pd->settings.size);
|
|
set_bit(PACKET_WRITABLE, &pd->flags);
|
|
} else {
|
|
pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
|
|
clear_bit(PACKET_WRITABLE, &pd->flags);
|
|
}
|
|
|
|
ret = pkt_set_segment_merging(pd, q);
|
|
if (ret)
|
|
goto out_putdev;
|
|
|
|
if (write) {
|
|
if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
|
|
dev_err(ddev, "not enough memory for buffers\n");
|
|
ret = -ENOMEM;
|
|
goto out_putdev;
|
|
}
|
|
dev_info(ddev, "%lukB available on disc\n", lba << 1);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_putdev:
|
|
blkdev_put(bdev, pd);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called when the device is closed. makes sure that the device flushes
|
|
* the internal cache before we close.
|
|
*/
|
|
static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
|
|
if (flush && pkt_flush_cache(pd))
|
|
dev_notice(ddev, "not flushing cache\n");
|
|
|
|
pkt_lock_door(pd, 0);
|
|
|
|
pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
|
|
blkdev_put(pd->bdev, pd);
|
|
|
|
pkt_shrink_pktlist(pd);
|
|
}
|
|
|
|
static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
|
|
{
|
|
if (dev_minor >= MAX_WRITERS)
|
|
return NULL;
|
|
|
|
dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
|
|
return pkt_devs[dev_minor];
|
|
}
|
|
|
|
static int pkt_open(struct gendisk *disk, blk_mode_t mode)
|
|
{
|
|
struct pktcdvd_device *pd = NULL;
|
|
int ret;
|
|
|
|
mutex_lock(&pktcdvd_mutex);
|
|
mutex_lock(&ctl_mutex);
|
|
pd = pkt_find_dev_from_minor(disk->first_minor);
|
|
if (!pd) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
BUG_ON(pd->refcnt < 0);
|
|
|
|
pd->refcnt++;
|
|
if (pd->refcnt > 1) {
|
|
if ((mode & BLK_OPEN_WRITE) &&
|
|
!test_bit(PACKET_WRITABLE, &pd->flags)) {
|
|
ret = -EBUSY;
|
|
goto out_dec;
|
|
}
|
|
} else {
|
|
ret = pkt_open_dev(pd, mode & BLK_OPEN_WRITE);
|
|
if (ret)
|
|
goto out_dec;
|
|
/*
|
|
* needed here as well, since ext2 (among others) may change
|
|
* the blocksize at mount time
|
|
*/
|
|
set_blocksize(disk->part0, CD_FRAMESIZE);
|
|
}
|
|
mutex_unlock(&ctl_mutex);
|
|
mutex_unlock(&pktcdvd_mutex);
|
|
return 0;
|
|
|
|
out_dec:
|
|
pd->refcnt--;
|
|
out:
|
|
mutex_unlock(&ctl_mutex);
|
|
mutex_unlock(&pktcdvd_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void pkt_release(struct gendisk *disk)
|
|
{
|
|
struct pktcdvd_device *pd = disk->private_data;
|
|
|
|
mutex_lock(&pktcdvd_mutex);
|
|
mutex_lock(&ctl_mutex);
|
|
pd->refcnt--;
|
|
BUG_ON(pd->refcnt < 0);
|
|
if (pd->refcnt == 0) {
|
|
int flush = test_bit(PACKET_WRITABLE, &pd->flags);
|
|
pkt_release_dev(pd, flush);
|
|
}
|
|
mutex_unlock(&ctl_mutex);
|
|
mutex_unlock(&pktcdvd_mutex);
|
|
}
|
|
|
|
|
|
static void pkt_end_io_read_cloned(struct bio *bio)
|
|
{
|
|
struct packet_stacked_data *psd = bio->bi_private;
|
|
struct pktcdvd_device *pd = psd->pd;
|
|
|
|
psd->bio->bi_status = bio->bi_status;
|
|
bio_put(bio);
|
|
bio_endio(psd->bio);
|
|
mempool_free(psd, &psd_pool);
|
|
pkt_bio_finished(pd);
|
|
}
|
|
|
|
static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
|
|
{
|
|
struct bio *cloned_bio =
|
|
bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set);
|
|
struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
|
|
|
|
psd->pd = pd;
|
|
psd->bio = bio;
|
|
cloned_bio->bi_private = psd;
|
|
cloned_bio->bi_end_io = pkt_end_io_read_cloned;
|
|
pd->stats.secs_r += bio_sectors(bio);
|
|
pkt_queue_bio(pd, cloned_bio);
|
|
}
|
|
|
|
static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
|
|
{
|
|
struct pktcdvd_device *pd = q->queuedata;
|
|
sector_t zone;
|
|
struct packet_data *pkt;
|
|
int was_empty, blocked_bio;
|
|
struct pkt_rb_node *node;
|
|
|
|
zone = get_zone(bio->bi_iter.bi_sector, pd);
|
|
|
|
/*
|
|
* If we find a matching packet in state WAITING or READ_WAIT, we can
|
|
* just append this bio to that packet.
|
|
*/
|
|
spin_lock(&pd->cdrw.active_list_lock);
|
|
blocked_bio = 0;
|
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
|
|
if (pkt->sector == zone) {
|
|
spin_lock(&pkt->lock);
|
|
if ((pkt->state == PACKET_WAITING_STATE) ||
|
|
(pkt->state == PACKET_READ_WAIT_STATE)) {
|
|
bio_list_add(&pkt->orig_bios, bio);
|
|
pkt->write_size +=
|
|
bio->bi_iter.bi_size / CD_FRAMESIZE;
|
|
if ((pkt->write_size >= pkt->frames) &&
|
|
(pkt->state == PACKET_WAITING_STATE)) {
|
|
atomic_inc(&pkt->run_sm);
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
return;
|
|
} else {
|
|
blocked_bio = 1;
|
|
}
|
|
spin_unlock(&pkt->lock);
|
|
}
|
|
}
|
|
spin_unlock(&pd->cdrw.active_list_lock);
|
|
|
|
/*
|
|
* Test if there is enough room left in the bio work queue
|
|
* (queue size >= congestion on mark).
|
|
* If not, wait till the work queue size is below the congestion off mark.
|
|
*/
|
|
spin_lock(&pd->lock);
|
|
if (pd->write_congestion_on > 0
|
|
&& pd->bio_queue_size >= pd->write_congestion_on) {
|
|
struct wait_bit_queue_entry wqe;
|
|
|
|
init_wait_var_entry(&wqe, &pd->congested, 0);
|
|
for (;;) {
|
|
prepare_to_wait_event(__var_waitqueue(&pd->congested),
|
|
&wqe.wq_entry,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (pd->bio_queue_size <= pd->write_congestion_off)
|
|
break;
|
|
pd->congested = true;
|
|
spin_unlock(&pd->lock);
|
|
schedule();
|
|
spin_lock(&pd->lock);
|
|
}
|
|
}
|
|
spin_unlock(&pd->lock);
|
|
|
|
/*
|
|
* No matching packet found. Store the bio in the work queue.
|
|
*/
|
|
node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
|
|
node->bio = bio;
|
|
spin_lock(&pd->lock);
|
|
BUG_ON(pd->bio_queue_size < 0);
|
|
was_empty = (pd->bio_queue_size == 0);
|
|
pkt_rbtree_insert(pd, node);
|
|
spin_unlock(&pd->lock);
|
|
|
|
/*
|
|
* Wake up the worker thread.
|
|
*/
|
|
atomic_set(&pd->scan_queue, 1);
|
|
if (was_empty) {
|
|
/* This wake_up is required for correct operation */
|
|
wake_up(&pd->wqueue);
|
|
} else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
|
|
/*
|
|
* This wake up is not required for correct operation,
|
|
* but improves performance in some cases.
|
|
*/
|
|
wake_up(&pd->wqueue);
|
|
}
|
|
}
|
|
|
|
static void pkt_submit_bio(struct bio *bio)
|
|
{
|
|
struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata;
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
struct bio *split;
|
|
|
|
bio = bio_split_to_limits(bio);
|
|
if (!bio)
|
|
return;
|
|
|
|
dev_dbg(ddev, "start = %6llx stop = %6llx\n",
|
|
bio->bi_iter.bi_sector, bio_end_sector(bio));
|
|
|
|
/*
|
|
* Clone READ bios so we can have our own bi_end_io callback.
|
|
*/
|
|
if (bio_data_dir(bio) == READ) {
|
|
pkt_make_request_read(pd, bio);
|
|
return;
|
|
}
|
|
|
|
if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
|
|
dev_notice(ddev, "WRITE for ro device (%llu)\n", bio->bi_iter.bi_sector);
|
|
goto end_io;
|
|
}
|
|
|
|
if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
|
|
dev_err(ddev, "wrong bio size\n");
|
|
goto end_io;
|
|
}
|
|
|
|
do {
|
|
sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
|
|
sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
|
|
|
|
if (last_zone != zone) {
|
|
BUG_ON(last_zone != zone + pd->settings.size);
|
|
|
|
split = bio_split(bio, last_zone -
|
|
bio->bi_iter.bi_sector,
|
|
GFP_NOIO, &pkt_bio_set);
|
|
bio_chain(split, bio);
|
|
} else {
|
|
split = bio;
|
|
}
|
|
|
|
pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split);
|
|
} while (split != bio);
|
|
|
|
return;
|
|
end_io:
|
|
bio_io_error(bio);
|
|
}
|
|
|
|
static void pkt_init_queue(struct pktcdvd_device *pd)
|
|
{
|
|
struct request_queue *q = pd->disk->queue;
|
|
|
|
blk_queue_logical_block_size(q, CD_FRAMESIZE);
|
|
blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
|
|
q->queuedata = pd;
|
|
}
|
|
|
|
static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
|
|
{
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int i;
|
|
struct block_device *bdev;
|
|
struct scsi_device *sdev;
|
|
|
|
if (pd->pkt_dev == dev) {
|
|
dev_err(ddev, "recursive setup not allowed\n");
|
|
return -EBUSY;
|
|
}
|
|
for (i = 0; i < MAX_WRITERS; i++) {
|
|
struct pktcdvd_device *pd2 = pkt_devs[i];
|
|
if (!pd2)
|
|
continue;
|
|
if (pd2->bdev->bd_dev == dev) {
|
|
dev_err(ddev, "%pg already setup\n", pd2->bdev);
|
|
return -EBUSY;
|
|
}
|
|
if (pd2->pkt_dev == dev) {
|
|
dev_err(ddev, "can't chain pktcdvd devices\n");
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_NDELAY, NULL,
|
|
NULL);
|
|
if (IS_ERR(bdev))
|
|
return PTR_ERR(bdev);
|
|
sdev = scsi_device_from_queue(bdev->bd_disk->queue);
|
|
if (!sdev) {
|
|
blkdev_put(bdev, NULL);
|
|
return -EINVAL;
|
|
}
|
|
put_device(&sdev->sdev_gendev);
|
|
|
|
/* This is safe, since we have a reference from open(). */
|
|
__module_get(THIS_MODULE);
|
|
|
|
pd->bdev = bdev;
|
|
set_blocksize(bdev, CD_FRAMESIZE);
|
|
|
|
pkt_init_queue(pd);
|
|
|
|
atomic_set(&pd->cdrw.pending_bios, 0);
|
|
pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->disk->disk_name);
|
|
if (IS_ERR(pd->cdrw.thread)) {
|
|
dev_err(ddev, "can't start kernel thread\n");
|
|
goto out_mem;
|
|
}
|
|
|
|
proc_create_single_data(pd->disk->disk_name, 0, pkt_proc, pkt_seq_show, pd);
|
|
dev_notice(ddev, "writer mapped to %pg\n", bdev);
|
|
return 0;
|
|
|
|
out_mem:
|
|
blkdev_put(bdev, NULL);
|
|
/* This is safe: open() is still holding a reference. */
|
|
module_put(THIS_MODULE);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int pkt_ioctl(struct block_device *bdev, blk_mode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pktcdvd_device *pd = bdev->bd_disk->private_data;
|
|
struct device *ddev = disk_to_dev(pd->disk);
|
|
int ret;
|
|
|
|
dev_dbg(ddev, "cmd %x, dev %d:%d\n", cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
|
|
|
|
mutex_lock(&pktcdvd_mutex);
|
|
switch (cmd) {
|
|
case CDROMEJECT:
|
|
/*
|
|
* The door gets locked when the device is opened, so we
|
|
* have to unlock it or else the eject command fails.
|
|
*/
|
|
if (pd->refcnt == 1)
|
|
pkt_lock_door(pd, 0);
|
|
fallthrough;
|
|
/*
|
|
* forward selected CDROM ioctls to CD-ROM, for UDF
|
|
*/
|
|
case CDROMMULTISESSION:
|
|
case CDROMREADTOCENTRY:
|
|
case CDROM_LAST_WRITTEN:
|
|
case CDROM_SEND_PACKET:
|
|
case SCSI_IOCTL_SEND_COMMAND:
|
|
if (!bdev->bd_disk->fops->ioctl)
|
|
ret = -ENOTTY;
|
|
else
|
|
ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
|
|
break;
|
|
default:
|
|
dev_dbg(ddev, "Unknown ioctl (%x)\n", cmd);
|
|
ret = -ENOTTY;
|
|
}
|
|
mutex_unlock(&pktcdvd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int pkt_check_events(struct gendisk *disk,
|
|
unsigned int clearing)
|
|
{
|
|
struct pktcdvd_device *pd = disk->private_data;
|
|
struct gendisk *attached_disk;
|
|
|
|
if (!pd)
|
|
return 0;
|
|
if (!pd->bdev)
|
|
return 0;
|
|
attached_disk = pd->bdev->bd_disk;
|
|
if (!attached_disk || !attached_disk->fops->check_events)
|
|
return 0;
|
|
return attached_disk->fops->check_events(attached_disk, clearing);
|
|
}
|
|
|
|
static char *pkt_devnode(struct gendisk *disk, umode_t *mode)
|
|
{
|
|
return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name);
|
|
}
|
|
|
|
static const struct block_device_operations pktcdvd_ops = {
|
|
.owner = THIS_MODULE,
|
|
.submit_bio = pkt_submit_bio,
|
|
.open = pkt_open,
|
|
.release = pkt_release,
|
|
.ioctl = pkt_ioctl,
|
|
.compat_ioctl = blkdev_compat_ptr_ioctl,
|
|
.check_events = pkt_check_events,
|
|
.devnode = pkt_devnode,
|
|
};
|
|
|
|
/*
|
|
* Set up mapping from pktcdvd device to CD-ROM device.
|
|
*/
|
|
static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
|
|
{
|
|
int idx;
|
|
int ret = -ENOMEM;
|
|
struct pktcdvd_device *pd;
|
|
struct gendisk *disk;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
for (idx = 0; idx < MAX_WRITERS; idx++)
|
|
if (!pkt_devs[idx])
|
|
break;
|
|
if (idx == MAX_WRITERS) {
|
|
pr_err("max %d writers supported\n", MAX_WRITERS);
|
|
ret = -EBUSY;
|
|
goto out_mutex;
|
|
}
|
|
|
|
pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
|
|
if (!pd)
|
|
goto out_mutex;
|
|
|
|
ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
|
|
sizeof(struct pkt_rb_node));
|
|
if (ret)
|
|
goto out_mem;
|
|
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
|
|
INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
|
|
spin_lock_init(&pd->cdrw.active_list_lock);
|
|
|
|
spin_lock_init(&pd->lock);
|
|
spin_lock_init(&pd->iosched.lock);
|
|
bio_list_init(&pd->iosched.read_queue);
|
|
bio_list_init(&pd->iosched.write_queue);
|
|
init_waitqueue_head(&pd->wqueue);
|
|
pd->bio_queue = RB_ROOT;
|
|
|
|
pd->write_congestion_on = write_congestion_on;
|
|
pd->write_congestion_off = write_congestion_off;
|
|
|
|
ret = -ENOMEM;
|
|
disk = blk_alloc_disk(NUMA_NO_NODE);
|
|
if (!disk)
|
|
goto out_mem;
|
|
pd->disk = disk;
|
|
disk->major = pktdev_major;
|
|
disk->first_minor = idx;
|
|
disk->minors = 1;
|
|
disk->fops = &pktcdvd_ops;
|
|
disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
|
|
snprintf(disk->disk_name, sizeof(disk->disk_name), DRIVER_NAME"%d", idx);
|
|
disk->private_data = pd;
|
|
|
|
pd->pkt_dev = MKDEV(pktdev_major, idx);
|
|
ret = pkt_new_dev(pd, dev);
|
|
if (ret)
|
|
goto out_mem2;
|
|
|
|
/* inherit events of the host device */
|
|
disk->events = pd->bdev->bd_disk->events;
|
|
|
|
ret = add_disk(disk);
|
|
if (ret)
|
|
goto out_mem2;
|
|
|
|
pkt_sysfs_dev_new(pd);
|
|
pkt_debugfs_dev_new(pd);
|
|
|
|
pkt_devs[idx] = pd;
|
|
if (pkt_dev)
|
|
*pkt_dev = pd->pkt_dev;
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
return 0;
|
|
|
|
out_mem2:
|
|
put_disk(disk);
|
|
out_mem:
|
|
mempool_exit(&pd->rb_pool);
|
|
kfree(pd);
|
|
out_mutex:
|
|
mutex_unlock(&ctl_mutex);
|
|
pr_err("setup of pktcdvd device failed\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Tear down mapping from pktcdvd device to CD-ROM device.
|
|
*/
|
|
static int pkt_remove_dev(dev_t pkt_dev)
|
|
{
|
|
struct pktcdvd_device *pd;
|
|
struct device *ddev;
|
|
int idx;
|
|
int ret = 0;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
for (idx = 0; idx < MAX_WRITERS; idx++) {
|
|
pd = pkt_devs[idx];
|
|
if (pd && (pd->pkt_dev == pkt_dev))
|
|
break;
|
|
}
|
|
if (idx == MAX_WRITERS) {
|
|
pr_debug("dev not setup\n");
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
if (pd->refcnt > 0) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ddev = disk_to_dev(pd->disk);
|
|
|
|
if (!IS_ERR(pd->cdrw.thread))
|
|
kthread_stop(pd->cdrw.thread);
|
|
|
|
pkt_devs[idx] = NULL;
|
|
|
|
pkt_debugfs_dev_remove(pd);
|
|
pkt_sysfs_dev_remove(pd);
|
|
|
|
blkdev_put(pd->bdev, NULL);
|
|
|
|
remove_proc_entry(pd->disk->disk_name, pkt_proc);
|
|
dev_notice(ddev, "writer unmapped\n");
|
|
|
|
del_gendisk(pd->disk);
|
|
put_disk(pd->disk);
|
|
|
|
mempool_exit(&pd->rb_pool);
|
|
kfree(pd);
|
|
|
|
/* This is safe: open() is still holding a reference. */
|
|
module_put(THIS_MODULE);
|
|
|
|
out:
|
|
mutex_unlock(&ctl_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
|
|
{
|
|
struct pktcdvd_device *pd;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
|
|
if (pd) {
|
|
ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
|
|
ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
|
|
} else {
|
|
ctrl_cmd->dev = 0;
|
|
ctrl_cmd->pkt_dev = 0;
|
|
}
|
|
ctrl_cmd->num_devices = MAX_WRITERS;
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
}
|
|
|
|
static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
struct pkt_ctrl_command ctrl_cmd;
|
|
int ret = 0;
|
|
dev_t pkt_dev = 0;
|
|
|
|
if (cmd != PACKET_CTRL_CMD)
|
|
return -ENOTTY;
|
|
|
|
if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
|
|
return -EFAULT;
|
|
|
|
switch (ctrl_cmd.command) {
|
|
case PKT_CTRL_CMD_SETUP:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
|
|
ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
|
|
break;
|
|
case PKT_CTRL_CMD_TEARDOWN:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
|
|
break;
|
|
case PKT_CTRL_CMD_STATUS:
|
|
pkt_get_status(&ctrl_cmd);
|
|
break;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
|
|
if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations pkt_ctl_fops = {
|
|
.open = nonseekable_open,
|
|
.unlocked_ioctl = pkt_ctl_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = pkt_ctl_compat_ioctl,
|
|
#endif
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice pkt_misc = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = DRIVER_NAME,
|
|
.nodename = "pktcdvd/control",
|
|
.fops = &pkt_ctl_fops
|
|
};
|
|
|
|
static int __init pkt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
mutex_init(&ctl_mutex);
|
|
|
|
ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
|
|
sizeof(struct packet_stacked_data));
|
|
if (ret)
|
|
return ret;
|
|
ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
|
|
if (ret) {
|
|
mempool_exit(&psd_pool);
|
|
return ret;
|
|
}
|
|
|
|
ret = register_blkdev(pktdev_major, DRIVER_NAME);
|
|
if (ret < 0) {
|
|
pr_err("unable to register block device\n");
|
|
goto out2;
|
|
}
|
|
if (!pktdev_major)
|
|
pktdev_major = ret;
|
|
|
|
ret = pkt_sysfs_init();
|
|
if (ret)
|
|
goto out;
|
|
|
|
pkt_debugfs_init();
|
|
|
|
ret = misc_register(&pkt_misc);
|
|
if (ret) {
|
|
pr_err("unable to register misc device\n");
|
|
goto out_misc;
|
|
}
|
|
|
|
pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
|
|
|
|
return 0;
|
|
|
|
out_misc:
|
|
pkt_debugfs_cleanup();
|
|
pkt_sysfs_cleanup();
|
|
out:
|
|
unregister_blkdev(pktdev_major, DRIVER_NAME);
|
|
out2:
|
|
mempool_exit(&psd_pool);
|
|
bioset_exit(&pkt_bio_set);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit pkt_exit(void)
|
|
{
|
|
remove_proc_entry("driver/"DRIVER_NAME, NULL);
|
|
misc_deregister(&pkt_misc);
|
|
|
|
pkt_debugfs_cleanup();
|
|
pkt_sysfs_cleanup();
|
|
|
|
unregister_blkdev(pktdev_major, DRIVER_NAME);
|
|
mempool_exit(&psd_pool);
|
|
bioset_exit(&pkt_bio_set);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
|
|
MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(pkt_init);
|
|
module_exit(pkt_exit);
|