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2926 lines
71 KiB
2926 lines
71 KiB
/* |
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* Copyright (C) 2000 Jens Axboe <[email protected]> |
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* Copyright (C) 2001-2004 Peter Osterlund <[email protected]> |
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* Copyright (C) 2006 Thomas Maier <[email protected]> |
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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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* typically ide-cd.c or 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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/pktcdvd.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/compat.h> |
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#include <linux/kthread.h> |
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#include <linux/errno.h> |
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#include <linux/spinlock.h> |
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#include <linux/file.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/miscdevice.h> |
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#include <linux/freezer.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/backing-dev.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_ioctl.h> |
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#include <scsi/scsi.h> |
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#include <linux/debugfs.h> |
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#include <linux/device.h> |
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#include <linux/nospec.h> |
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#include <linux/uaccess.h> |
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|
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#define DRIVER_NAME "pktcdvd" |
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|
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#define pkt_err(pd, fmt, ...) \ |
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pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) |
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#define pkt_notice(pd, fmt, ...) \ |
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pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) |
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#define pkt_info(pd, fmt, ...) \ |
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pr_info("%s: " fmt, pd->name, ##__VA_ARGS__) |
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|
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#define pkt_dbg(level, pd, fmt, ...) \ |
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do { \ |
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if (level == 2 && PACKET_DEBUG >= 2) \ |
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pr_notice("%s: %s():" fmt, \ |
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pd->name, __func__, ##__VA_ARGS__); \ |
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else if (level == 1 && PACKET_DEBUG >= 1) \ |
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pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ |
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} while (0) |
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|
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#define MAX_SPEED 0xffff |
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|
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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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|
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static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
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static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
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|
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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 int pkt_seq_show(struct seq_file *m, void *p); |
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|
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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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/* |
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* create and register a pktcdvd kernel object. |
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*/ |
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static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, |
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const char* name, |
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struct kobject* parent, |
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struct kobj_type* ktype) |
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{ |
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struct pktcdvd_kobj *p; |
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int error; |
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|
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p = kzalloc(sizeof(*p), GFP_KERNEL); |
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if (!p) |
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return NULL; |
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p->pd = pd; |
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error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
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if (error) { |
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kobject_put(&p->kobj); |
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return NULL; |
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} |
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kobject_uevent(&p->kobj, KOBJ_ADD); |
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return p; |
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} |
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/* |
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* remove a pktcdvd kernel object. |
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*/ |
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static void pkt_kobj_remove(struct pktcdvd_kobj *p) |
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{ |
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if (p) |
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kobject_put(&p->kobj); |
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} |
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/* |
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* default release function for pktcdvd kernel objects. |
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*/ |
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static void pkt_kobj_release(struct kobject *kobj) |
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{ |
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kfree(to_pktcdvdkobj(kobj)); |
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} |
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|
|
|
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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 <[email protected]> |
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* |
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**********************************************************/ |
|
|
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#define DEF_ATTR(_obj,_name,_mode) \ |
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static struct attribute _obj = { .name = _name, .mode = _mode } |
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|
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/********************************************************** |
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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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|
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DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); |
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DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); |
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DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); |
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DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); |
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DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); |
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DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); |
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|
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static struct attribute *kobj_pkt_attrs_stat[] = { |
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&kobj_pkt_attr_st1, |
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&kobj_pkt_attr_st2, |
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&kobj_pkt_attr_st3, |
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&kobj_pkt_attr_st4, |
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&kobj_pkt_attr_st5, |
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&kobj_pkt_attr_st6, |
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NULL |
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}; |
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|
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DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); |
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DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); |
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DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); |
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|
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static struct attribute *kobj_pkt_attrs_wqueue[] = { |
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&kobj_pkt_attr_wq1, |
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&kobj_pkt_attr_wq2, |
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&kobj_pkt_attr_wq3, |
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NULL |
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}; |
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|
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static ssize_t kobj_pkt_show(struct kobject *kobj, |
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struct attribute *attr, char *data) |
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{ |
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struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
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int n = 0; |
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int v; |
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if (strcmp(attr->name, "packets_started") == 0) { |
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n = sprintf(data, "%lu\n", pd->stats.pkt_started); |
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|
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} else if (strcmp(attr->name, "packets_finished") == 0) { |
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n = sprintf(data, "%lu\n", pd->stats.pkt_ended); |
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|
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} else if (strcmp(attr->name, "kb_written") == 0) { |
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n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); |
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|
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} else if (strcmp(attr->name, "kb_read") == 0) { |
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n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); |
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|
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} else if (strcmp(attr->name, "kb_read_gather") == 0) { |
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n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); |
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|
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} else if (strcmp(attr->name, "size") == 0) { |
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spin_lock(&pd->lock); |
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v = pd->bio_queue_size; |
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spin_unlock(&pd->lock); |
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n = sprintf(data, "%d\n", v); |
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|
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} else if (strcmp(attr->name, "congestion_off") == 0) { |
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spin_lock(&pd->lock); |
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v = pd->write_congestion_off; |
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spin_unlock(&pd->lock); |
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n = sprintf(data, "%d\n", v); |
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|
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} else if (strcmp(attr->name, "congestion_on") == 0) { |
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spin_lock(&pd->lock); |
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v = pd->write_congestion_on; |
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spin_unlock(&pd->lock); |
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n = sprintf(data, "%d\n", v); |
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} |
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return n; |
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} |
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|
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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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|
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static ssize_t kobj_pkt_store(struct kobject *kobj, |
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struct attribute *attr, |
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const char *data, size_t len) |
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{ |
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struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
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int val; |
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|
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if (strcmp(attr->name, "reset") == 0 && 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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} else if (strcmp(attr->name, "congestion_off") == 0 |
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&& sscanf(data, "%d", &val) == 1) { |
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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, |
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&pd->write_congestion_on); |
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spin_unlock(&pd->lock); |
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|
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} else if (strcmp(attr->name, "congestion_on") == 0 |
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&& sscanf(data, "%d", &val) == 1) { |
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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, |
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&pd->write_congestion_on); |
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spin_unlock(&pd->lock); |
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} |
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return len; |
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} |
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|
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static const struct sysfs_ops kobj_pkt_ops = { |
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.show = kobj_pkt_show, |
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.store = kobj_pkt_store |
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}; |
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static struct kobj_type kobj_pkt_type_stat = { |
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.release = pkt_kobj_release, |
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.sysfs_ops = &kobj_pkt_ops, |
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.default_attrs = kobj_pkt_attrs_stat |
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}; |
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static struct kobj_type kobj_pkt_type_wqueue = { |
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.release = pkt_kobj_release, |
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.sysfs_ops = &kobj_pkt_ops, |
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.default_attrs = kobj_pkt_attrs_wqueue |
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}; |
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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_pktcdvd) { |
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pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
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"%s", pd->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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if (pd->dev) { |
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pd->kobj_stat = pkt_kobj_create(pd, "stat", |
|
&pd->dev->kobj, |
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&kobj_pkt_type_stat); |
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pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", |
|
&pd->dev->kobj, |
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&kobj_pkt_type_wqueue); |
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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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pkt_kobj_remove(pd->kobj_stat); |
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pkt_kobj_remove(pd->kobj_wqueue); |
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if (class_pktcdvd) |
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device_unregister(pd->dev); |
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} |
|
|
|
|
|
/******************************************************************** |
|
/sys/class/pktcdvd/ |
|
add map block device |
|
remove unmap packet dev |
|
device_map show mappings |
|
*******************************************************************/ |
|
|
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static void class_pktcdvd_release(struct class *cls) |
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{ |
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kfree(cls); |
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} |
|
|
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static ssize_t device_map_show(struct class *c, struct class_attribute *attr, |
|
char *data) |
|
{ |
|
int n = 0; |
|
int idx; |
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
|
for (idx = 0; idx < MAX_WRITERS; idx++) { |
|
struct pktcdvd_device *pd = pkt_devs[idx]; |
|
if (!pd) |
|
continue; |
|
n += sprintf(data+n, "%s %u:%u %u:%u\n", |
|
pd->name, |
|
MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), |
|
MAJOR(pd->bdev->bd_dev), |
|
MINOR(pd->bdev->bd_dev)); |
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} |
|
mutex_unlock(&ctl_mutex); |
|
return n; |
|
} |
|
static CLASS_ATTR_RO(device_map); |
|
|
|
static ssize_t add_store(struct class *c, struct class_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned int major, minor; |
|
|
|
if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
|
/* pkt_setup_dev() expects caller to hold reference to self */ |
|
if (!try_module_get(THIS_MODULE)) |
|
return -ENODEV; |
|
|
|
pkt_setup_dev(MKDEV(major, minor), NULL); |
|
|
|
module_put(THIS_MODULE); |
|
|
|
return count; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
static CLASS_ATTR_WO(add); |
|
|
|
static ssize_t remove_store(struct class *c, struct class_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned int major, minor; |
|
if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
|
pkt_remove_dev(MKDEV(major, minor)); |
|
return count; |
|
} |
|
return -EINVAL; |
|
} |
|
static CLASS_ATTR_WO(remove); |
|
|
|
static struct attribute *class_pktcdvd_attrs[] = { |
|
&class_attr_add.attr, |
|
&class_attr_remove.attr, |
|
&class_attr_device_map.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(class_pktcdvd); |
|
|
|
static int pkt_sysfs_init(void) |
|
{ |
|
int ret = 0; |
|
|
|
/* |
|
* create control files in sysfs |
|
* /sys/class/pktcdvd/... |
|
*/ |
|
class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); |
|
if (!class_pktcdvd) |
|
return -ENOMEM; |
|
class_pktcdvd->name = DRIVER_NAME; |
|
class_pktcdvd->owner = THIS_MODULE; |
|
class_pktcdvd->class_release = class_pktcdvd_release; |
|
class_pktcdvd->class_groups = class_pktcdvd_groups; |
|
ret = class_register(class_pktcdvd); |
|
if (ret) { |
|
kfree(class_pktcdvd); |
|
class_pktcdvd = NULL; |
|
pr_err("failed to create class pktcdvd\n"); |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
static void pkt_sysfs_cleanup(void) |
|
{ |
|
if (class_pktcdvd) |
|
class_destroy(class_pktcdvd); |
|
class_pktcdvd = NULL; |
|
} |
|
|
|
/******************************************************************** |
|
entries in debugfs |
|
|
|
/sys/kernel/debug/pktcdvd[0-7]/ |
|
info |
|
|
|
*******************************************************************/ |
|
|
|
static int pkt_debugfs_seq_show(struct seq_file *m, void *p) |
|
{ |
|
return pkt_seq_show(m, p); |
|
} |
|
|
|
static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) |
|
{ |
|
return single_open(file, pkt_debugfs_seq_show, inode->i_private); |
|
} |
|
|
|
static const struct file_operations debug_fops = { |
|
.open = pkt_debugfs_fops_open, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.release = single_release, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) |
|
{ |
|
if (!pkt_debugfs_root) |
|
return; |
|
pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
|
if (!pd->dfs_d_root) |
|
return; |
|
|
|
pd->dfs_f_info = debugfs_create_file("info", 0444, |
|
pd->dfs_d_root, pd, &debug_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) |
|
{ |
|
BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); |
|
if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { |
|
pkt_dbg(2, pd, "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(GFP_KERNEL, frames); |
|
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++) { |
|
struct bio *bio = bio_kmalloc(GFP_KERNEL, 1); |
|
if (!bio) |
|
goto no_rd_bio; |
|
|
|
pkt->r_bios[i] = bio; |
|
} |
|
|
|
return pkt; |
|
|
|
no_rd_bio: |
|
for (i = 0; i < frames; i++) { |
|
struct bio *bio = pkt->r_bios[i]; |
|
if (bio) |
|
bio_put(bio); |
|
} |
|
|
|
no_page: |
|
for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
|
if (pkt->pages[i]) |
|
__free_page(pkt->pages[i]); |
|
bio_put(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++) { |
|
struct bio *bio = pkt->r_bios[i]; |
|
if (bio) |
|
bio_put(bio); |
|
} |
|
for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
|
__free_page(pkt->pages[i]); |
|
bio_put(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 request *rq; |
|
int ret = 0; |
|
|
|
rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? |
|
REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
|
if (IS_ERR(rq)) |
|
return PTR_ERR(rq); |
|
|
|
if (cgc->buflen) { |
|
ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
|
GFP_NOIO); |
|
if (ret) |
|
goto out; |
|
} |
|
|
|
scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
|
memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
|
|
|
rq->timeout = 60*HZ; |
|
if (cgc->quiet) |
|
rq->rq_flags |= RQF_QUIET; |
|
|
|
blk_execute_rq(pd->bdev->bd_disk, rq, 0); |
|
if (scsi_req(rq)->result) |
|
ret = -EIO; |
|
out: |
|
blk_put_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 scsi_sense_hdr *sshdr = cgc->sshdr; |
|
|
|
if (sshdr) |
|
pkt_err(pd, "%*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 |
|
pkt_err(pd, "%*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; |
|
cgc.cmd[2] = (read_speed >> 8) & 0xff; |
|
cgc.cmd[3] = read_speed & 0xff; |
|
cgc.cmd[4] = (write_speed >> 8) & 0xff; |
|
cgc.cmd[5] = write_speed & 0xff; |
|
|
|
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) |
|
{ |
|
|
|
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) { |
|
pkt_dbg(2, pd, "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) { |
|
pkt_dbg(2, pd, "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) |
|
{ |
|
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; |
|
} else 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; |
|
} else { |
|
pkt_err(pd, "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); |
|
|
|
pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
|
bio, (unsigned long long)pkt->sector, |
|
(unsigned long long)bio->bi_iter.bi_sector, bio->bi_status); |
|
|
|
if (bio->bi_status) |
|
atomic_inc(&pkt->io_errors); |
|
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); |
|
|
|
pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status); |
|
|
|
pd->stats.pkt_ended++; |
|
|
|
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) |
|
{ |
|
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) { |
|
pkt_dbg(2, pd, "zone %llx cached\n", |
|
(unsigned long long)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_reset(bio); |
|
bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
|
bio_set_dev(bio, pd->bdev); |
|
bio->bi_end_io = pkt_end_io_read; |
|
bio->bi_private = pkt; |
|
|
|
p = (f * CD_FRAMESIZE) / PAGE_SIZE; |
|
offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
|
pkt_dbg(2, pd, "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); |
|
bio_set_op_attrs(bio, REQ_OP_READ, 0); |
|
pkt_queue_bio(pd, bio); |
|
frames_read++; |
|
} |
|
|
|
out_account: |
|
pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
|
frames_read, (unsigned long long)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 packet_data *pkt, enum packet_data_state state) |
|
{ |
|
#if PACKET_DEBUG > 1 |
|
static const char *state_name[] = { |
|
"IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" |
|
}; |
|
enum packet_data_state old_state = pkt->state; |
|
pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
|
pkt->id, (unsigned long long)pkt->sector, |
|
state_name[old_state], state_name[state]); |
|
#endif |
|
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 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; |
|
int wakeup; |
|
|
|
atomic_set(&pd->scan_queue, 0); |
|
|
|
if (list_empty(&pd->cdrw.pkt_free_list)) { |
|
pkt_dbg(2, pd, "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) { |
|
pkt_dbg(2, pd, "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); |
|
pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
|
while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
|
bio = node->bio; |
|
pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long) |
|
get_zone(bio->bi_iter.bi_sector, pd)); |
|
if (get_zone(bio->bi_iter.bi_sector, pd) != 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 */ |
|
wakeup = (pd->write_congestion_on > 0 |
|
&& pd->bio_queue_size <= pd->write_congestion_off); |
|
spin_unlock(&pd->lock); |
|
if (wakeup) { |
|
clear_bdi_congested(pd->disk->queue->backing_dev_info, |
|
BLK_RW_ASYNC); |
|
} |
|
|
|
pkt->sleep_time = max(PACKET_WAIT_TIME, 1); |
|
pkt_set_state(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; |
|
} |
|
|
|
/* |
|
* 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) |
|
{ |
|
int f; |
|
|
|
bio_reset(pkt->w_bio); |
|
pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
|
bio_set_dev(pkt->w_bio, pd->bdev); |
|
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(); |
|
} |
|
pkt_dbg(2, pd, "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(pkt, PACKET_WRITE_WAIT_STATE); |
|
spin_unlock(&pkt->lock); |
|
|
|
pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
|
pkt->write_size, (unsigned long long)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); |
|
bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0); |
|
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) |
|
{ |
|
pkt_dbg(2, pd, "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(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(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(pkt, PACKET_FINISHED_STATE); |
|
} else { |
|
pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
|
} |
|
break; |
|
|
|
case PACKET_RECOVERY_STATE: |
|
pkt_dbg(2, pd, "No recovery possible\n"); |
|
pkt_set_state(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 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(pkt, PACKET_IDLE_STATE); |
|
atomic_set(&pd->scan_queue, 1); |
|
} |
|
} |
|
spin_unlock(&pd->cdrw.active_list_lock); |
|
} |
|
|
|
static void pkt_count_states(struct pktcdvd_device *pd, int *states) |
|
{ |
|
struct packet_data *pkt; |
|
int i; |
|
|
|
for (i = 0; i < PACKET_NUM_STATES; i++) |
|
states[i] = 0; |
|
|
|
spin_lock(&pd->cdrw.active_list_lock); |
|
list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
|
states[pkt->state]++; |
|
} |
|
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 packet_data *pkt; |
|
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 */ |
|
if (PACKET_DEBUG > 1) { |
|
int states[PACKET_NUM_STATES]; |
|
pkt_count_states(pd, states); |
|
pkt_dbg(2, pd, "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; |
|
} |
|
|
|
pkt_dbg(2, pd, "sleeping\n"); |
|
residue = schedule_timeout(min_sleep_time); |
|
pkt_dbg(2, pd, "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) |
|
{ |
|
pkt_info(pd, "%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); |
|
cgc->cmd[7] = cgc->buflen >> 8; |
|
cgc->cmd[8] = cgc->buflen & 0xff; |
|
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 */ |
|
cgc->cmd[7] = cgc->buflen >> 8; |
|
cgc->cmd[8] = cgc->buflen & 0xff; |
|
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; |
|
cgc.cmd[4] = (track & 0xff00) >> 8; |
|
cgc.cmd[5] = track & 0xff; |
|
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 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 + ((buffer[0] << 8) | (buffer[1] & 0xff)); |
|
pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); |
|
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 |
|
*/ |
|
pkt_err(pd, "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) |
|
{ |
|
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; |
|
|
|
pkt_err(pd, "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) |
|
{ |
|
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: |
|
pkt_dbg(2, pd, "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) { |
|
pkt_notice(pd, "unknown disc - no track?\n"); |
|
return 0; |
|
} |
|
|
|
if (di->disc_type != 0x20 && di->disc_type != 0) { |
|
pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
|
return 0; |
|
} |
|
|
|
if (di->erasable == 0) { |
|
pkt_notice(pd, "disc not erasable\n"); |
|
return 0; |
|
} |
|
|
|
if (di->border_status == PACKET_SESSION_RESERVED) { |
|
pkt_err(pd, "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 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 : buf[6] << 8 | buf[7]; |
|
|
|
memset(&di, 0, sizeof(disc_information)); |
|
memset(&ti, 0, sizeof(track_information)); |
|
|
|
ret = pkt_get_disc_info(pd, &di); |
|
if (ret) { |
|
pkt_err(pd, "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) { |
|
pkt_err(pd, "failed get_track\n"); |
|
return ret; |
|
} |
|
|
|
if (!pkt_writable_track(pd, &ti)) { |
|
pkt_err(pd, "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) { |
|
pkt_notice(pd, "detected zero packet size!\n"); |
|
return -ENXIO; |
|
} |
|
if (pd->settings.size > PACKET_MAX_SECTORS) { |
|
pkt_err(pd, "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: |
|
pkt_err(pd, "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, |
|
int set) |
|
{ |
|
struct packet_command cgc; |
|
struct scsi_sense_hdr sshdr; |
|
unsigned char buf[64]; |
|
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; |
|
|
|
buf[pd->mode_offset + 10] |= (!!set << 2); |
|
|
|
cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); |
|
ret = pkt_mode_select(pd, &cgc); |
|
if (ret) { |
|
pkt_err(pd, "write caching control failed\n"); |
|
pkt_dump_sense(pd, &cgc); |
|
} else if (!ret && set) |
|
pkt_notice(pd, "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 = (cap_buf[30] << 8) + cap_buf[31]; |
|
if (num_spdb > 0) |
|
offset = 34; |
|
} |
|
|
|
*write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; |
|
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 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 = ((unsigned int) buf[0]<<8) + buf[1] + 2; |
|
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)) { |
|
pkt_notice(pd, "disc type is not CD-RW\n"); |
|
return 1; |
|
} |
|
if (!(buf[6] & 0x4)) { |
|
pkt_notice(pd, "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: |
|
pkt_notice(pd, "unknown disc sub-type %d\n", st); |
|
return 1; |
|
} |
|
if (*speed) { |
|
pkt_info(pd, "maximum media speed: %d\n", *speed); |
|
return 0; |
|
} else { |
|
pkt_notice(pd, "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 packet_command cgc; |
|
struct scsi_sense_hdr sshdr; |
|
int ret; |
|
|
|
pkt_dbg(2, pd, "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) |
|
{ |
|
int ret; |
|
unsigned int write_speed, media_write_speed, read_speed; |
|
|
|
ret = pkt_probe_settings(pd); |
|
if (ret) { |
|
pkt_dbg(2, pd, "failed probe\n"); |
|
return ret; |
|
} |
|
|
|
ret = pkt_set_write_settings(pd); |
|
if (ret) { |
|
pkt_dbg(1, pd, "failed saving write settings\n"); |
|
return -EIO; |
|
} |
|
|
|
pkt_write_caching(pd, USE_WCACHING); |
|
|
|
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 */ |
|
pkt_dbg(1, pd, "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); |
|
pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
|
break; |
|
} |
|
read_speed = write_speed; |
|
|
|
ret = pkt_set_speed(pd, write_speed, read_speed); |
|
if (ret) { |
|
pkt_dbg(1, pd, "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) { |
|
pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* called at open time. |
|
*/ |
|
static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
|
{ |
|
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, FMODE_READ | FMODE_EXCL, pd); |
|
if (IS_ERR(bdev)) { |
|
ret = PTR_ERR(bdev); |
|
goto out; |
|
} |
|
|
|
ret = pkt_get_last_written(pd, &lba); |
|
if (ret) { |
|
pkt_err(pd, "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)) { |
|
pkt_err(pd, "not enough memory for buffers\n"); |
|
ret = -ENOMEM; |
|
goto out_putdev; |
|
} |
|
pkt_info(pd, "%lukB available on disc\n", lba << 1); |
|
} |
|
|
|
return 0; |
|
|
|
out_putdev: |
|
blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
|
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) |
|
{ |
|
if (flush && pkt_flush_cache(pd)) |
|
pkt_dbg(1, pd, "not flushing cache\n"); |
|
|
|
pkt_lock_door(pd, 0); |
|
|
|
pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
|
blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
|
|
|
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 block_device *bdev, fmode_t mode) |
|
{ |
|
struct pktcdvd_device *pd = NULL; |
|
int ret; |
|
|
|
mutex_lock(&pktcdvd_mutex); |
|
mutex_lock(&ctl_mutex); |
|
pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
|
if (!pd) { |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
BUG_ON(pd->refcnt < 0); |
|
|
|
pd->refcnt++; |
|
if (pd->refcnt > 1) { |
|
if ((mode & FMODE_WRITE) && |
|
!test_bit(PACKET_WRITABLE, &pd->flags)) { |
|
ret = -EBUSY; |
|
goto out_dec; |
|
} |
|
} else { |
|
ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
|
if (ret) |
|
goto out_dec; |
|
/* |
|
* needed here as well, since ext2 (among others) may change |
|
* the blocksize at mount time |
|
*/ |
|
set_blocksize(bdev, 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_close(struct gendisk *disk, fmode_t mode) |
|
{ |
|
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_clone_fast(bio, GFP_NOIO, &pkt_bio_set); |
|
struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO); |
|
|
|
psd->pd = pd; |
|
psd->bio = bio; |
|
bio_set_dev(cloned_bio, pd->bdev); |
|
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) { |
|
set_bdi_congested(q->backing_dev_info, BLK_RW_ASYNC); |
|
do { |
|
spin_unlock(&pd->lock); |
|
congestion_wait(BLK_RW_ASYNC, HZ); |
|
spin_lock(&pd->lock); |
|
} while(pd->bio_queue_size > pd->write_congestion_off); |
|
} |
|
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 blk_qc_t pkt_submit_bio(struct bio *bio) |
|
{ |
|
struct pktcdvd_device *pd; |
|
char b[BDEVNAME_SIZE]; |
|
struct bio *split; |
|
|
|
blk_queue_split(&bio); |
|
|
|
pd = bio->bi_bdev->bd_disk->queue->queuedata; |
|
if (!pd) { |
|
pr_err("%s incorrect request queue\n", bio_devname(bio, b)); |
|
goto end_io; |
|
} |
|
|
|
pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", |
|
(unsigned long long)bio->bi_iter.bi_sector, |
|
(unsigned long long)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 BLK_QC_T_NONE; |
|
} |
|
|
|
if (!test_bit(PACKET_WRITABLE, &pd->flags)) { |
|
pkt_notice(pd, "WRITE for ro device (%llu)\n", |
|
(unsigned long long)bio->bi_iter.bi_sector); |
|
goto end_io; |
|
} |
|
|
|
if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { |
|
pkt_err(pd, "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 BLK_QC_T_NONE; |
|
end_io: |
|
bio_io_error(bio); |
|
return BLK_QC_T_NONE; |
|
} |
|
|
|
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_seq_show(struct seq_file *m, void *p) |
|
{ |
|
struct pktcdvd_device *pd = m->private; |
|
char *msg; |
|
char bdev_buf[BDEVNAME_SIZE]; |
|
int states[PACKET_NUM_STATES]; |
|
|
|
seq_printf(m, "Writer %s mapped to %s:\n", pd->name, |
|
bdevname(pd->bdev, bdev_buf)); |
|
|
|
seq_printf(m, "\nSettings:\n"); |
|
seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); |
|
|
|
if (pd->settings.write_type == 0) |
|
msg = "Packet"; |
|
else |
|
msg = "Unknown"; |
|
seq_printf(m, "\twrite type:\t\t%s\n", msg); |
|
|
|
seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); |
|
seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); |
|
|
|
seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); |
|
|
|
if (pd->settings.block_mode == PACKET_BLOCK_MODE1) |
|
msg = "Mode 1"; |
|
else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) |
|
msg = "Mode 2"; |
|
else |
|
msg = "Unknown"; |
|
seq_printf(m, "\tblock mode:\t\t%s\n", msg); |
|
|
|
seq_printf(m, "\nStatistics:\n"); |
|
seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); |
|
seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); |
|
seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); |
|
seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); |
|
seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); |
|
|
|
seq_printf(m, "\nMisc:\n"); |
|
seq_printf(m, "\treference count:\t%d\n", pd->refcnt); |
|
seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); |
|
seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); |
|
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", (unsigned long long)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; |
|
} |
|
|
|
static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
|
{ |
|
int i; |
|
char b[BDEVNAME_SIZE]; |
|
struct block_device *bdev; |
|
|
|
if (pd->pkt_dev == dev) { |
|
pkt_err(pd, "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) { |
|
pkt_err(pd, "%s already setup\n", |
|
bdevname(pd2->bdev, b)); |
|
return -EBUSY; |
|
} |
|
if (pd2->pkt_dev == dev) { |
|
pkt_err(pd, "can't chain pktcdvd devices\n"); |
|
return -EBUSY; |
|
} |
|
} |
|
|
|
bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_NDELAY, NULL); |
|
if (IS_ERR(bdev)) |
|
return PTR_ERR(bdev); |
|
if (!blk_queue_scsi_passthrough(bdev_get_queue(bdev))) { |
|
blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
|
return -EINVAL; |
|
} |
|
|
|
/* 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->name); |
|
if (IS_ERR(pd->cdrw.thread)) { |
|
pkt_err(pd, "can't start kernel thread\n"); |
|
goto out_mem; |
|
} |
|
|
|
proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd); |
|
pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
|
return 0; |
|
|
|
out_mem: |
|
blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
|
/* This is safe: open() is still holding a reference. */ |
|
module_put(THIS_MODULE); |
|
return -ENOMEM; |
|
} |
|
|
|
static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
|
int ret; |
|
|
|
pkt_dbg(2, pd, "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: |
|
pkt_dbg(2, pd, "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_close, |
|
.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); |
|
sprintf(pd->name, DRIVER_NAME"%d", idx); |
|
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 = alloc_disk(1); |
|
if (!disk) |
|
goto out_mem; |
|
pd->disk = disk; |
|
disk->major = pktdev_major; |
|
disk->first_minor = idx; |
|
disk->fops = &pktcdvd_ops; |
|
disk->flags = GENHD_FL_REMOVABLE; |
|
strcpy(disk->disk_name, pd->name); |
|
disk->private_data = pd; |
|
disk->queue = blk_alloc_queue(NUMA_NO_NODE); |
|
if (!disk->queue) |
|
goto out_mem2; |
|
|
|
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; |
|
|
|
add_disk(disk); |
|
|
|
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; |
|
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; |
|
} |
|
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, FMODE_READ | FMODE_NDELAY); |
|
|
|
remove_proc_entry(pd->name, pkt_proc); |
|
pkt_dbg(1, pd, "writer unmapped\n"); |
|
|
|
del_gendisk(pd->disk); |
|
blk_cleanup_queue(pd->disk->queue); |
|
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 <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(pkt_init); |
|
module_exit(pkt_exit);
|
|
|