| /* |
| * Copyright (C) 2000 Jens Axboe <axboe@suse.de> |
| * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> |
| * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
| * |
| * May be copied or modified under the terms of the GNU General Public |
| * License. See linux/COPYING for more information. |
| * |
| * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
| * DVD-RAM devices. |
| * |
| * Theory of operation: |
| * |
| * At the lowest level, there is the standard driver for the CD/DVD device, |
| * typically ide-cd.c or sr.c. This driver can handle read and write requests, |
| * but it doesn't know anything about the special restrictions that apply to |
| * packet writing. One restriction is that write requests must be aligned to |
| * packet boundaries on the physical media, and the size of a write request |
| * must be equal to the packet size. Another restriction is that a |
| * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read |
| * command, if the previous command was a write. |
| * |
| * The purpose of the packet writing driver is to hide these restrictions from |
| * higher layers, such as file systems, and present a block device that can be |
| * randomly read and written using 2kB-sized blocks. |
| * |
| * The lowest layer in the packet writing driver is the packet I/O scheduler. |
| * Its data is defined by the struct packet_iosched and includes two bio |
| * queues with pending read and write requests. These queues are processed |
| * by the pkt_iosched_process_queue() function. The write requests in this |
| * queue are already properly aligned and sized. This layer is responsible for |
| * issuing the flush cache commands and scheduling the I/O in a good order. |
| * |
| * The next layer transforms unaligned write requests to aligned writes. This |
| * transformation requires reading missing pieces of data from the underlying |
| * block device, assembling the pieces to full packets and queuing them to the |
| * packet I/O scheduler. |
| * |
| * At the top layer there is a custom make_request_fn function that forwards |
| * read requests directly to the iosched queue and puts write requests in the |
| * unaligned write queue. A kernel thread performs the necessary read |
| * gathering to convert the unaligned writes to aligned writes and then feeds |
| * them to the packet I/O scheduler. |
| * |
| *************************************************************************/ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/pktcdvd.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/compat.h> |
| #include <linux/kthread.h> |
| #include <linux/errno.h> |
| #include <linux/spinlock.h> |
| #include <linux/file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/miscdevice.h> |
| #include <linux/freezer.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/backing-dev.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_ioctl.h> |
| #include <scsi/scsi.h> |
| #include <linux/debugfs.h> |
| #include <linux/device.h> |
| |
| #include <asm/uaccess.h> |
| |
| #define DRIVER_NAME "pktcdvd" |
| |
| #define pkt_err(pd, fmt, ...) \ |
| pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) |
| #define pkt_notice(pd, fmt, ...) \ |
| pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) |
| #define pkt_info(pd, fmt, ...) \ |
| pr_info("%s: " fmt, pd->name, ##__VA_ARGS__) |
| |
| #define pkt_dbg(level, pd, fmt, ...) \ |
| do { \ |
| if (level == 2 && PACKET_DEBUG >= 2) \ |
| pr_notice("%s: %s():" fmt, \ |
| pd->name, __func__, ##__VA_ARGS__); \ |
| else if (level == 1 && PACKET_DEBUG >= 1) \ |
| pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ |
| } while (0) |
| |
| #define MAX_SPEED 0xffff |
| |
| static DEFINE_MUTEX(pktcdvd_mutex); |
| static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
| static struct proc_dir_entry *pkt_proc; |
| static int pktdev_major; |
| static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
| static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; |
| static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
| static mempool_t *psd_pool; |
| |
| static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
| static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
| |
| /* forward declaration */ |
| static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); |
| static int pkt_remove_dev(dev_t pkt_dev); |
| static int pkt_seq_show(struct seq_file *m, void *p); |
| |
| static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) |
| { |
| return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); |
| } |
| |
| /* |
| * create and register a pktcdvd kernel object. |
| */ |
| static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, |
| const char* name, |
| struct kobject* parent, |
| struct kobj_type* ktype) |
| { |
| struct pktcdvd_kobj *p; |
| int error; |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) |
| return NULL; |
| p->pd = pd; |
| error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
| if (error) { |
| kobject_put(&p->kobj); |
| return NULL; |
| } |
| kobject_uevent(&p->kobj, KOBJ_ADD); |
| return p; |
| } |
| /* |
| * remove a pktcdvd kernel object. |
| */ |
| static void pkt_kobj_remove(struct pktcdvd_kobj *p) |
| { |
| if (p) |
| kobject_put(&p->kobj); |
| } |
| /* |
| * default release function for pktcdvd kernel objects. |
| */ |
| static void pkt_kobj_release(struct kobject *kobj) |
| { |
| kfree(to_pktcdvdkobj(kobj)); |
| } |
| |
| |
| /********************************************************** |
| * |
| * sysfs interface for pktcdvd |
| * by (C) 2006 Thomas Maier <balagi@justmail.de> |
| * |
| **********************************************************/ |
| |
| #define DEF_ATTR(_obj,_name,_mode) \ |
| static struct attribute _obj = { .name = _name, .mode = _mode } |
| |
| /********************************************************** |
| /sys/class/pktcdvd/pktcdvd[0-7]/ |
| stat/reset |
| stat/packets_started |
| stat/packets_finished |
| stat/kb_written |
| stat/kb_read |
| stat/kb_read_gather |
| write_queue/size |
| write_queue/congestion_off |
| write_queue/congestion_on |
| **********************************************************/ |
| |
| DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); |
| DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); |
| DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); |
| DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); |
| DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); |
| DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); |
| |
| static struct attribute *kobj_pkt_attrs_stat[] = { |
| &kobj_pkt_attr_st1, |
| &kobj_pkt_attr_st2, |
| &kobj_pkt_attr_st3, |
| &kobj_pkt_attr_st4, |
| &kobj_pkt_attr_st5, |
| &kobj_pkt_attr_st6, |
| NULL |
| }; |
| |
| DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); |
| DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); |
| DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); |
| |
| static struct attribute *kobj_pkt_attrs_wqueue[] = { |
| &kobj_pkt_attr_wq1, |
| &kobj_pkt_attr_wq2, |
| &kobj_pkt_attr_wq3, |
| NULL |
| }; |
| |
| static ssize_t kobj_pkt_show(struct kobject *kobj, |
| struct attribute *attr, char *data) |
| { |
| struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
| int n = 0; |
| int v; |
| if (strcmp(attr->name, "packets_started") == 0) { |
| n = sprintf(data, "%lu\n", pd->stats.pkt_started); |
| |
| } else if (strcmp(attr->name, "packets_finished") == 0) { |
| n = sprintf(data, "%lu\n", pd->stats.pkt_ended); |
| |
| } else if (strcmp(attr->name, "kb_written") == 0) { |
| n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); |
| |
| } else if (strcmp(attr->name, "kb_read") == 0) { |
| n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); |
| |
| } else if (strcmp(attr->name, "kb_read_gather") == 0) { |
| n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); |
| |
| } else if (strcmp(attr->name, "size") == 0) { |
| spin_lock(&pd->lock); |
| v = pd->bio_queue_size; |
| spin_unlock(&pd->lock); |
| n = sprintf(data, "%d\n", v); |
| |
| } else if (strcmp(attr->name, "congestion_off") == 0) { |
| spin_lock(&pd->lock); |
| v = pd->write_congestion_off; |
| spin_unlock(&pd->lock); |
| n = sprintf(data, "%d\n", v); |
| |
| } else if (strcmp(attr->name, "congestion_on") == 0) { |
| spin_lock(&pd->lock); |
| v = pd->write_congestion_on; |
| spin_unlock(&pd->lock); |
| n = sprintf(data, "%d\n", v); |
| } |
| return n; |
| } |
| |
| static void init_write_congestion_marks(int* lo, int* hi) |
| { |
| if (*hi > 0) { |
| *hi = max(*hi, 500); |
| *hi = min(*hi, 1000000); |
| if (*lo <= 0) |
| *lo = *hi - 100; |
| else { |
| *lo = min(*lo, *hi - 100); |
| *lo = max(*lo, 100); |
| } |
| } else { |
| *hi = -1; |
| *lo = -1; |
| } |
| } |
| |
| static ssize_t kobj_pkt_store(struct kobject *kobj, |
| struct attribute *attr, |
| const char *data, size_t len) |
| { |
| struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
| int val; |
| |
| if (strcmp(attr->name, "reset") == 0 && len > 0) { |
| pd->stats.pkt_started = 0; |
| pd->stats.pkt_ended = 0; |
| pd->stats.secs_w = 0; |
| pd->stats.secs_rg = 0; |
| pd->stats.secs_r = 0; |
| |
| } else if (strcmp(attr->name, "congestion_off") == 0 |
| && sscanf(data, "%d", &val) == 1) { |
| spin_lock(&pd->lock); |
| pd->write_congestion_off = val; |
| init_write_congestion_marks(&pd->write_congestion_off, |
| &pd->write_congestion_on); |
| spin_unlock(&pd->lock); |
| |
| } else if (strcmp(attr->name, "congestion_on") == 0 |
| && sscanf(data, "%d", &val) == 1) { |
| spin_lock(&pd->lock); |
| pd->write_congestion_on = val; |
| init_write_congestion_marks(&pd->write_congestion_off, |
| &pd->write_congestion_on); |
| spin_unlock(&pd->lock); |
| } |
| return len; |
| } |
| |
| static const struct sysfs_ops kobj_pkt_ops = { |
| .show = kobj_pkt_show, |
| .store = kobj_pkt_store |
| }; |
| static struct kobj_type kobj_pkt_type_stat = { |
| .release = pkt_kobj_release, |
| .sysfs_ops = &kobj_pkt_ops, |
| .default_attrs = kobj_pkt_attrs_stat |
| }; |
| static struct kobj_type kobj_pkt_type_wqueue = { |
| .release = pkt_kobj_release, |
| .sysfs_ops = &kobj_pkt_ops, |
| .default_attrs = kobj_pkt_attrs_wqueue |
| }; |
| |
| static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) |
| { |
| if (class_pktcdvd) { |
| pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
| "%s", pd->name); |
| if (IS_ERR(pd->dev)) |
| pd->dev = NULL; |
| } |
| if (pd->dev) { |
| pd->kobj_stat = pkt_kobj_create(pd, "stat", |
| &pd->dev->kobj, |
| &kobj_pkt_type_stat); |
| pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", |
| &pd->dev->kobj, |
| &kobj_pkt_type_wqueue); |
| } |
| } |
| |
| static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) |
| { |
| pkt_kobj_remove(pd->kobj_stat); |
| pkt_kobj_remove(pd->kobj_wqueue); |
| if (class_pktcdvd) |
| device_unregister(pd->dev); |
| } |
| |
| |
| /******************************************************************** |
| /sys/class/pktcdvd/ |
| add map block device |
| remove unmap packet dev |
| device_map show mappings |
| *******************************************************************/ |
| |
| static void class_pktcdvd_release(struct class *cls) |
| { |
| kfree(cls); |
| } |
| static ssize_t class_pktcdvd_show_map(struct class *c, |
| struct class_attribute *attr, |
| char *data) |
| { |
| int n = 0; |
| int idx; |
| 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)); |
| } |
| mutex_unlock(&ctl_mutex); |
| return n; |
| } |
| |
| static ssize_t class_pktcdvd_store_add(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 ssize_t class_pktcdvd_store_remove(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 struct class_attribute class_pktcdvd_attrs[] = { |
| __ATTR(add, 0200, NULL, class_pktcdvd_store_add), |
| __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), |
| __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), |
| __ATTR_NULL |
| }; |
| |
| |
| 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_attrs = class_pktcdvd_attrs; |
| 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", S_IRUGO, |
| 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) ? |
| WRITE : READ, __GFP_RECLAIM); |
| if (IS_ERR(rq)) |
| return PTR_ERR(rq); |
| blk_rq_set_block_pc(rq); |
| |
| if (cgc->buflen) { |
| ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
| __GFP_RECLAIM); |
| if (ret) |
| goto out; |
| } |
| |
| rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
| memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
| |
| rq->timeout = 60*HZ; |
| if (cgc->quiet) |
| rq->rq_flags |= RQF_QUIET; |
| |
| blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
| if (rq->errors) |
| 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 request_sense *sense = cgc->sense; |
| |
| if (sense) |
| pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n", |
| CDROM_PACKET_SIZE, cgc->cmd, |
| sense->sense_key, sense->asc, sense->ascq, |
| sense_key_string(sense->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 request_sense sense; |
| int ret; |
| |
| init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| cgc.sense = &sense; |
| 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; |
| |
| if ((ret = pkt_generic_packet(pd, &cgc))) |
| 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); |
| generic_make_request(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; |
| } |
| } |
| |
| /* |
| * Copy all data for this packet to pkt->pages[], so that |
| * a) The number of required segments for the write bio is minimized, which |
| * is necessary for some scsi controllers. |
| * b) The data can be used as cache to avoid read requests if we receive a |
| * new write request for the same zone. |
| */ |
| static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
| { |
| int f, p, offs; |
| |
| /* Copy all data to pkt->pages[] */ |
| p = 0; |
| offs = 0; |
| for (f = 0; f < pkt->frames; f++) { |
| if (bvec[f].bv_page != pkt->pages[p]) { |
| void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset; |
| void *vto = page_address(pkt->pages[p]) + offs; |
| memcpy(vto, vfrom, CD_FRAMESIZE); |
| kunmap_atomic(vfrom); |
| bvec[f].bv_page = pkt->pages[p]; |
| bvec[f].bv_offset = offs; |
| } else { |
| BUG_ON(bvec[f].bv_offset != offs); |
| } |
| offs += CD_FRAMESIZE; |
| if (offs >= PAGE_SIZE) { |
| offs = 0; |
| p++; |
| } |
| } |
| } |
| |
| 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_error); |
| |
| if (bio->bi_error) |
| 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_error); |
| |
| 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->bi_bdev = 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); |
| } |
| } |
| |
| /* |
| * recover a failed write, query for relocation if possible |
| * |
| * returns 1 if recovery is possible, or 0 if not |
| * |
| */ |
| static int pkt_start_recovery(struct packet_data *pkt) |
| { |
| /* |
| * FIXME. We need help from the file system to implement |
| * recovery handling. |
| */ |
| return 0; |
| #if 0 |
| struct request *rq = pkt->rq; |
| struct pktcdvd_device *pd = rq->rq_disk->private_data; |
| struct block_device *pkt_bdev; |
| struct super_block *sb = NULL; |
| unsigned long old_block, new_block; |
| sector_t new_sector; |
| |
| pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); |
| if (pkt_bdev) { |
| sb = get_super(pkt_bdev); |
| bdput(pkt_bdev); |
| } |
| |
| if (!sb) |
| return 0; |
| |
| if (!sb->s_op->relocate_blocks) |
| goto out; |
| |
| old_block = pkt->sector / (CD_FRAMESIZE >> 9); |
| if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) |
| goto out; |
| |
| new_sector = new_block * (CD_FRAMESIZE >> 9); |
| pkt->sector = new_sector; |
| |
| bio_reset(pkt->bio); |
| pkt->bio->bi_bdev = pd->bdev; |
| bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0); |
| pkt->bio->bi_iter.bi_sector = new_sector; |
| pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE; |
| pkt->bio->bi_vcnt = pkt->frames; |
| |
| pkt->bio->bi_end_io = pkt_end_io_packet_write; |
| pkt->bio->bi_private = pkt; |
| |
| drop_super(sb); |
| return 1; |
| |
| out: |
| drop_super(sb); |
| return 0; |
| #endif |
| } |
| |
| 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; |
| struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
| |
| bio_reset(pkt->w_bio); |
| pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
| pkt->w_bio->bi_bdev = 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++) { |
| bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
| bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
| if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_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_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_make_local_copy(pkt, bvec); |
| 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, int error) |
| { |
| struct bio *bio; |
| |
| if (error) |
| pkt->cache_valid = 0; |
| |
| /* Finish all bios corresponding to this packet */ |
| while ((bio = bio_list_pop(&pkt->orig_bios))) { |
| bio->bi_error = error; |
| 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_error) { |
| pkt_set_state(pkt, PACKET_FINISHED_STATE); |
| } else { |
| pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
| } |
| break; |
| |
| case PACKET_RECOVERY_STATE: |
| if (pkt_start_recovery(pkt)) { |
| pkt_start_write(pd, pkt); |
| } else { |
| 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_error); |
| 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; |
| |
| if ((ret = pkt_generic_packet(pd, &cgc))) |
| 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; |
| |
| if ((ret = pkt_generic_packet(pd, &cgc))) |
| 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 = -1; |
| |
| if ((ret = pkt_get_disc_info(pd, &di))) |
| return ret; |
| |
| last_track = (di.last_track_msb << 8) | di.last_track_lsb; |
| if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| return ret; |
| |
| /* if this track is blank, try the previous. */ |
| if (ti.blank) { |
| last_track--; |
| if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| 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 request_sense sense; |
| 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.sense = &sense; |
| if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 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.sense = &sense; |
| if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 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; |
| if ((ret = pkt_mode_select(pd, &cgc))) { |
| 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)); |
| |
| if ((ret = pkt_get_disc_info(pd, &di))) { |
| 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; */ |
| if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { |
| 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 request_sense sense; |
| unsigned char buf[64]; |
| int ret; |
| |
| init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
| cgc.sense = &sense; |
| cgc.buflen = pd->mode_offset + 12; |
| |
| /* |
| * caching mode page might not be there, so quiet this command |
| */ |
| cgc.quiet = 1; |
| |
| if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) |
| 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 request_sense sense; |
| 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.sense = &sense; |
| |
| 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 request_sense sense; |
| unsigned char buf[64]; |
| unsigned int size, st, sp; |
| int ret; |
| |
| init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); |
| cgc.sense = &sense; |
| 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.sense = &sense; |
| 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 request_sense sense; |
| int ret; |
| |
| pkt_dbg(2, pd, "Performing OPC\n"); |
| |
| init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| cgc.sense = &sense; |
| cgc.timeout = 60*HZ; |
| cgc.cmd[0] = GPCMD_SEND_OPC; |
| cgc.cmd[1] = 1; |
| if ((ret = pkt_generic_packet(pd, &cgc))) |
| 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; |
| |
| if ((ret = pkt_probe_settings(pd))) { |
| pkt_dbg(2, pd, "failed probe\n"); |
| return ret; |
| } |
| |
| if ((ret = pkt_set_write_settings(pd))) { |
| pkt_dbg(1, pd, "failed saving write settings\n"); |
| return -EIO; |
| } |
| |
| pkt_write_caching(pd, USE_WCACHING); |
| |
| if ((ret = pkt_get_max_speed(pd, &write_speed))) |
| 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: |
| if ((ret = pkt_media_speed(pd, &media_write_speed))) |
| 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; |
| |
| if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { |
| pkt_dbg(1, pd, "couldn't set write speed\n"); |
| return -EIO; |
| } |
| pd->write_speed = write_speed; |
| pd->read_speed = read_speed; |
| |
| if ((ret = pkt_perform_opc(pd))) { |
| 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; |
| |
| /* |
| * 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 bdget() can't fail. |
| */ |
| bdget(pd->bdev->bd_dev); |
| if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
| goto out; |
| |
| if ((ret = pkt_get_last_written(pd, &lba))) { |
| pkt_err(pd, "pkt_get_last_written failed\n"); |
| goto out_putdev; |
| } |
| |
| set_capacity(pd->disk, lba << 2); |
| set_capacity(pd->bdev->bd_disk, lba << 2); |
| bd_set_size(pd->bdev, (loff_t)lba << 11); |
| |
| q = bdev_get_queue(pd->bdev); |
| if (write) { |
| if ((ret = pkt_open_write(pd))) |
| 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. |
| */ |
| spin_lock_irq(q->queue_lock); |
| blk_queue_max_hw_sectors(q, pd->settings.size); |
| spin_unlock_irq(q->queue_lock); |
| set_bit(PACKET_WRITABLE, &pd->flags); |
| } else { |
| pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
| clear_bit(PACKET_WRITABLE, &pd->flags); |
| } |
| |
| if ((ret = pkt_set_segment_merging(pd, q))) |
| 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(pd->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; |
| 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_error = bio->bi_error; |
| 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(bio, GFP_NOIO); |
| struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); |
| |
| psd->pd = pd; |
| psd->bio = bio; |
| cloned_bio->bi_bdev = 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_make_request(struct request_queue *q, struct bio *bio) |
| { |
| struct pktcdvd_device *pd; |
| char b[BDEVNAME_SIZE]; |
| struct bio *split; |
| |
| blk_queue_bounce(q, &bio); |
| |
| blk_queue_split(q, &bio, q->bio_split); |
| |
| pd = q->queuedata; |
| if (!pd) { |
| pr_err("%s incorrect request queue\n", |
| bdevname(bio->bi_bdev, 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, fs_bio_set); |
| bio_chain(split, bio); |
| } else { |
| split = bio; |
| } |
| |
| pkt_make_request_write(q, 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_make_request(q, pkt_make_request); |
| 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_seq_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, pkt_seq_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations pkt_proc_fops = { |
| .open = pkt_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release |
| }; |
| |
| static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
| { |
| int i; |
| int ret = 0; |
| 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 = bdget(dev); |
| if (!bdev) |
| return -ENOMEM; |
| ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
| if (ret) |
| return ret; |
| |
| /* 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"); |
| ret = -ENOMEM; |
| goto out_mem; |
| } |
| |
| proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, 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 ret; |
| } |
| |
| 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); |
| /* fallthru */ |
| /* |
| * 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: |
| ret = __blkdev_driver_ioctl(pd->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 const struct block_device_operations pktcdvd_ops = { |
| .owner = THIS_MODULE, |
| .open = pkt_open, |
| .release = pkt_close, |
| .ioctl = pkt_ioctl, |
| .check_events = pkt_check_events, |
| }; |
| |
| static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode) |
| { |
| return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); |
| } |
| |
| /* |
| * 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; |
| |
| pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
| sizeof(struct pkt_rb_node)); |
| if (!pd->rb_pool) |
| 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; |
| |
| 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->devnode = pktcdvd_devnode; |
| disk->private_data = pd; |
| disk->queue = blk_alloc_queue(GFP_KERNEL); |
| 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; |
| disk->async_events = pd->bdev->bd_disk->async_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_destroy(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_destroy(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) |
| { |
|