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[2620:137:e000::1:20]) by mx.google.com with ESMTP id j62-20020a638b41000000b0046ec381a28bsi8151093pge.25.2022.12.02.10.29.06; Fri, 02 Dec 2022 10:29:19 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=BET+2J87; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234415AbiLBS2Y (ORCPT + 99 others); Fri, 2 Dec 2022 13:28:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234448AbiLBS2R (ORCPT ); Fri, 2 Dec 2022 13:28:17 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC390ACA51; Fri, 2 Dec 2022 10:28:08 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 07660CE1F5D; Fri, 2 Dec 2022 18:28:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A67DFC433D7; Fri, 2 Dec 2022 18:28:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670005684; bh=5FOVFiQmzeMmTx+NFuwImEVT8PtZgcRCQQuaj6VPs70=; h=From:To:Cc:Subject:Date:From; b=BET+2J875S0Mn0MNhcZr2EesQ8F3ynEQhridElT9Ubj86O5FpQ5JCt0ki8RVTyNnM Av+lnGZ50M+AnRuGS1KWQXWyDkPzM/cUzAQvGDniQ7oAwgOVuRZVewaIavR7g9H9mL tWZl/KJC3AdjKA6LqSwRY4h3d1ZnDWsVEAF+d6TA= From: Greg Kroah-Hartman To: Jens Axboe Cc: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Christoph Hellwig , Thomas Maier , Peter Osterlund , linux-block@vger.kernel.org Subject: [PATCH] pktcdvd: remove driver. Date: Fri, 2 Dec 2022 19:27:58 +0100 Message-Id: <20221202182758.1339039-1-gregkh@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=97233; i=gregkh@linuxfoundation.org; h=from:subject; bh=5FOVFiQmzeMmTx+NFuwImEVT8PtZgcRCQQuaj6VPs70=; b=owGbwMvMwCRo6H6F97bub03G02pJDMldzmuWW2UVNKxRc3lwXnOvvvqDj3X8O2cv9LkXOemRdtq/ bxH3OmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiYX4MC/aUmcpNSey02LCUMe7H6V UKO+N1VzMsWK7z3eTawnq1bWW1S+e1Hgg9aHIgDwA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751127959282765909?= X-GMAIL-MSGID: =?utf-8?q?1751127959282765909?= Way back in 2016 in commit 5a8b187c61e9 ("pktcdvd: mark as unmaintained and deprecated") this driver was marked as "will be removed soon". 5 years seems long enough to have it stick around after that, so finally remove the thing now. Reported-by: Christoph Hellwig Cc: Jens Axboe Cc: Thomas Maier Cc: Peter Osterlund Cc: linux-block@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/debugfs-pktcdvd | 18 - Documentation/ABI/testing/sysfs-class-pktcdvd | 97 - MAINTAINERS | 7 - drivers/block/Kconfig | 43 - drivers/block/Makefile | 1 - drivers/block/pktcdvd.c | 2944 ----------------- include/linux/pktcdvd.h | 197 -- include/uapi/linux/pktcdvd.h | 112 - 8 files changed, 3419 deletions(-) delete mode 100644 Documentation/ABI/testing/debugfs-pktcdvd delete mode 100644 Documentation/ABI/testing/sysfs-class-pktcdvd delete mode 100644 drivers/block/pktcdvd.c delete mode 100644 include/linux/pktcdvd.h delete mode 100644 include/uapi/linux/pktcdvd.h diff --git a/Documentation/ABI/testing/debugfs-pktcdvd b/Documentation/ABI/testing/debugfs-pktcdvd deleted file mode 100644 index f6f65a4faea0..000000000000 --- a/Documentation/ABI/testing/debugfs-pktcdvd +++ /dev/null @@ -1,18 +0,0 @@ -What: /sys/kernel/debug/pktcdvd/pktcdvd[0-7] -Date: Oct. 2006 -KernelVersion: 2.6.20 -Contact: Thomas Maier -Description: - -The pktcdvd module (packet writing driver) creates -these files in debugfs: - -/sys/kernel/debug/pktcdvd/pktcdvd[0-7]/ - - ==== ====== ==================================== - info 0444 Lots of driver statistics and infos. - ==== ====== ==================================== - -Example:: - - cat /sys/kernel/debug/pktcdvd/pktcdvd0/info diff --git a/Documentation/ABI/testing/sysfs-class-pktcdvd b/Documentation/ABI/testing/sysfs-class-pktcdvd deleted file mode 100644 index ba1ce626591d..000000000000 --- a/Documentation/ABI/testing/sysfs-class-pktcdvd +++ /dev/null @@ -1,97 +0,0 @@ -sysfs interface ---------------- -The pktcdvd module (packet writing driver) creates the following files in the -sysfs: ( is in the format major:minor) - -What: /sys/class/pktcdvd/add -What: /sys/class/pktcdvd/remove -What: /sys/class/pktcdvd/device_map -Date: Oct. 2006 -KernelVersion: 2.6.20 -Contact: Thomas Maier -Description: - - ========== ============================================== - add (WO) Write a block device id (major:minor) to - create a new pktcdvd device and map it to the - block device. - - remove (WO) Write the pktcdvd device id (major:minor) - to remove the pktcdvd device. - - device_map (RO) Shows the device mapping in format: - pktcdvd[0-7] - ========== ============================================== - - -What: /sys/class/pktcdvd/pktcdvd[0-7]/dev -What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent -Date: Oct. 2006 -KernelVersion: 2.6.20 -Contact: Thomas Maier -Description: - dev: (RO) Device id - - uevent: (WO) To send a uevent - - -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather -What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset -Date: Oct. 2006 -KernelVersion: 2.6.20 -Contact: Thomas Maier -Description: - packets_started: (RO) Number of started packets. - - packets_finished: (RO) Number of finished packets. - - kb_written: (RO) kBytes written. - - kb_read: (RO) kBytes read. - - kb_read_gather: (RO) kBytes read to fill write packets. - - reset: (WO) Write any value to it to reset - pktcdvd device statistic values, like - bytes read/written. - - -What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size -What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off -What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on -Date: Oct. 2006 -KernelVersion: 2.6.20 -Contact: Thomas Maier -Description: - ============== ================================================ - size (RO) Contains the size of the bio write queue. - - congestion_off (RW) If bio write queue size is below this mark, - accept new bio requests from the block layer. - - congestion_on (RW) If bio write queue size is higher as this - mark, do no longer accept bio write requests - from the block layer and wait till the pktcdvd - device has processed enough bio's so that bio - write queue size is below congestion off mark. - A value of <= 0 disables congestion control. - ============== ================================================ - - -Example: --------- -To use the pktcdvd sysfs interface directly, you can do:: - - # create a new pktcdvd device mapped to /dev/hdc - echo "22:0" >/sys/class/pktcdvd/add - cat /sys/class/pktcdvd/device_map - # assuming device pktcdvd0 was created, look at stat's - cat /sys/class/pktcdvd/pktcdvd0/stat/kb_written - # print the device id of the mapped block device - fgrep pktcdvd0 /sys/class/pktcdvd/device_map - # remove device, using pktcdvd0 device id 253:0 - echo "253:0" >/sys/class/pktcdvd/remove diff --git a/MAINTAINERS b/MAINTAINERS index 2585e7edc335..42c215c59f89 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16379,13 +16379,6 @@ S: Supported F: Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml F: drivers/input/keyboard/pinephone-keyboard.c -PKTCDVD DRIVER -M: linux-block@vger.kernel.org -S: Orphan -F: drivers/block/pktcdvd.c -F: include/linux/pktcdvd.h -F: include/uapi/linux/pktcdvd.h - PLANTOWER PMS7003 AIR POLLUTION SENSOR DRIVER M: Tomasz Duszynski S: Maintained diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index a41145d52de9..a2184b428493 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -285,49 +285,6 @@ config BLK_DEV_RAM_SIZE The default value is 4096 kilobytes. Only change this if you know what you are doing. -config CDROM_PKTCDVD - tristate "Packet writing on CD/DVD media (DEPRECATED)" - depends on !UML - depends on SCSI - select CDROM - help - Note: This driver is deprecated and will be removed from the - kernel in the near future! - - If you have a CDROM/DVD drive that supports packet writing, say - Y to include support. It should work with any MMC/Mt Fuji - compliant ATAPI or SCSI drive, which is just about any newer - DVD/CD writer. - - Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs - is possible. - DVD-RW disks must be in restricted overwrite mode. - - See the file - for further information on the use of this driver. - - To compile this driver as a module, choose M here: the - module will be called pktcdvd. - -config CDROM_PKTCDVD_BUFFERS - int "Free buffers for data gathering" - depends on CDROM_PKTCDVD - default "8" - help - This controls the maximum number of active concurrent packets. More - concurrent packets can increase write performance, but also require - more memory. Each concurrent packet will require approximately 64Kb - of non-swappable kernel memory, memory which will be allocated when - a disc is opened for writing. - -config CDROM_PKTCDVD_WCACHE - bool "Enable write caching" - depends on CDROM_PKTCDVD - help - If enabled, write caching will be set for the CD-R/W device. For now - this option is dangerous unless the CD-RW media is known good, as we - don't do deferred write error handling yet. - config ATA_OVER_ETH tristate "ATA over Ethernet support" depends on NET diff --git a/drivers/block/Makefile b/drivers/block/Makefile index 101612cba303..962ee65d8ca3 100644 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -20,7 +20,6 @@ obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o obj-$(CONFIG_N64CART) += n64cart.o obj-$(CONFIG_BLK_DEV_RAM) += brd.o obj-$(CONFIG_BLK_DEV_LOOP) += loop.o -obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o obj-$(CONFIG_SUNVDC) += sunvdc.o obj-$(CONFIG_BLK_DEV_NBD) += nbd.o diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c deleted file mode 100644 index 4cea3b08087e..000000000000 --- a/drivers/block/pktcdvd.c +++ /dev/null @@ -1,2944 +0,0 @@ -/* - * Copyright (C) 2000 Jens Axboe - * Copyright (C) 2001-2004 Peter Osterlund - * Copyright (C) 2006 Thomas Maier - * - * 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, - * such as drivers/scsi/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 ->submit_bio 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#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 bio_set pkt_bio_set; - -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); -} - -/********************************************************** - * sysfs interface for pktcdvd - * by (C) 2006 Thomas Maier - - /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 - **********************************************************/ - -static ssize_t packets_started_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started); -} -static DEVICE_ATTR_RO(packets_started); - -static ssize_t packets_finished_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended); -} -static DEVICE_ATTR_RO(packets_finished); - -static ssize_t kb_written_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1); -} -static DEVICE_ATTR_RO(kb_written); - -static ssize_t kb_read_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1); -} -static DEVICE_ATTR_RO(kb_read); - -static ssize_t kb_read_gather_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1); -} -static DEVICE_ATTR_RO(kb_read_gather); - -static ssize_t reset_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t len) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - - if (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; - } - return len; -} -static DEVICE_ATTR_WO(reset); - -static struct attribute *pkt_stat_attrs[] = { - &dev_attr_packets_finished.attr, - &dev_attr_packets_started.attr, - &dev_attr_kb_read.attr, - &dev_attr_kb_written.attr, - &dev_attr_kb_read_gather.attr, - &dev_attr_reset.attr, - NULL, -}; - -static const struct attribute_group pkt_stat_group = { - .name = "stat", - .attrs = pkt_stat_attrs, -}; - -static ssize_t size_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - int n; - - spin_lock(&pd->lock); - n = sysfs_emit(buf, "%d\n", pd->bio_queue_size); - spin_unlock(&pd->lock); - return n; -} -static DEVICE_ATTR_RO(size); - -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 congestion_off_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - int n; - - spin_lock(&pd->lock); - n = sysfs_emit(buf, "%d\n", pd->write_congestion_off); - spin_unlock(&pd->lock); - return n; -} - -static ssize_t congestion_off_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - int val; - - if (sscanf(buf, "%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); - } - return len; -} -static DEVICE_ATTR_RW(congestion_off); - -static ssize_t congestion_on_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - int n; - - spin_lock(&pd->lock); - n = sysfs_emit(buf, "%d\n", pd->write_congestion_on); - spin_unlock(&pd->lock); - return n; -} - -static ssize_t congestion_on_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct pktcdvd_device *pd = dev_get_drvdata(dev); - int val; - - if (sscanf(buf, "%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 DEVICE_ATTR_RW(congestion_on); - -static struct attribute *pkt_wq_attrs[] = { - &dev_attr_congestion_on.attr, - &dev_attr_congestion_off.attr, - &dev_attr_size.attr, - NULL, -}; - -static const struct attribute_group pkt_wq_group = { - .name = "write_queue", - .attrs = pkt_wq_attrs, -}; - -static const struct attribute_group *pkt_groups[] = { - &pkt_stat_group, - &pkt_wq_group, - NULL, -}; - -static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) -{ - if (class_pktcdvd) { - pd->dev = device_create_with_groups(class_pktcdvd, NULL, - MKDEV(0, 0), pd, pkt_groups, - "%s", pd->name); - if (IS_ERR(pd->dev)) - pd->dev = NULL; - } -} - -static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) -{ - 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 device_map_show(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 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(frames, GFP_KERNEL); - if (!pkt->w_bio) - goto no_bio; - - for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { - pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); - if (!pkt->pages[i]) - goto no_page; - } - - spin_lock_init(&pkt->lock); - bio_list_init(&pkt->orig_bios); - - for (i = 0; i < frames; i++) { - pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL); - if (!pkt->r_bios[i]) - goto no_rd_bio; - } - - return pkt; - -no_rd_bio: - for (i = 0; i < frames; i++) - kfree(pkt->r_bios[i]); -no_page: - for (i = 0; i < frames / FRAMES_PER_PAGE; i++) - if (pkt->pages[i]) - __free_page(pkt->pages[i]); - kfree(pkt->w_bio); -no_bio: - kfree(pkt); -no_pkt: - return NULL; -} - -/* - * Free a packet_data struct - */ -static void pkt_free_packet_data(struct packet_data *pkt) -{ - int i; - - for (i = 0; i < pkt->frames; i++) - kfree(pkt->r_bios[i]); - for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) - __free_page(pkt->pages[i]); - kfree(pkt->w_bio); - kfree(pkt); -} - -static void pkt_shrink_pktlist(struct pktcdvd_device *pd) -{ - struct packet_data *pkt, *next; - - BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); - - list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { - pkt_free_packet_data(pkt); - } - INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); -} - -static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) -{ - struct packet_data *pkt; - - BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); - - while (nr_packets > 0) { - pkt = pkt_alloc_packet_data(pd->settings.size >> 2); - if (!pkt) { - pkt_shrink_pktlist(pd); - return 0; - } - pkt->id = nr_packets; - pkt->pd = pd; - list_add(&pkt->list, &pd->cdrw.pkt_free_list); - nr_packets--; - } - return 1; -} - -static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) -{ - struct rb_node *n = rb_next(&node->rb_node); - if (!n) - return NULL; - return rb_entry(n, struct pkt_rb_node, rb_node); -} - -static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) -{ - rb_erase(&node->rb_node, &pd->bio_queue); - mempool_free(node, &pd->rb_pool); - pd->bio_queue_size--; - BUG_ON(pd->bio_queue_size < 0); -} - -/* - * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. - */ -static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) -{ - struct rb_node *n = pd->bio_queue.rb_node; - struct rb_node *next; - struct pkt_rb_node *tmp; - - if (!n) { - BUG_ON(pd->bio_queue_size > 0); - return NULL; - } - - for (;;) { - tmp = rb_entry(n, struct pkt_rb_node, rb_node); - if (s <= tmp->bio->bi_iter.bi_sector) - next = n->rb_left; - else - next = n->rb_right; - if (!next) - break; - n = next; - } - - if (s > tmp->bio->bi_iter.bi_sector) { - tmp = pkt_rbtree_next(tmp); - if (!tmp) - return NULL; - } - BUG_ON(s > tmp->bio->bi_iter.bi_sector); - return tmp; -} - -/* - * Insert a node into the pd->bio_queue rb tree. - */ -static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) -{ - struct rb_node **p = &pd->bio_queue.rb_node; - struct rb_node *parent = NULL; - sector_t s = node->bio->bi_iter.bi_sector; - struct pkt_rb_node *tmp; - - while (*p) { - parent = *p; - tmp = rb_entry(parent, struct pkt_rb_node, rb_node); - if (s < tmp->bio->bi_iter.bi_sector) - p = &(*p)->rb_left; - else - p = &(*p)->rb_right; - } - rb_link_node(&node->rb_node, parent, p); - rb_insert_color(&node->rb_node, &pd->bio_queue); - pd->bio_queue_size++; -} - -/* - * Send a packet_command to the underlying block device and - * wait for completion. - */ -static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) -{ - struct request_queue *q = bdev_get_queue(pd->bdev); - struct scsi_cmnd *scmd; - struct request *rq; - int ret = 0; - - rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? - REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); - if (IS_ERR(rq)) - return PTR_ERR(rq); - scmd = blk_mq_rq_to_pdu(rq); - - if (cgc->buflen) { - ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, - GFP_NOIO); - if (ret) - goto out; - } - - scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]); - memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE); - - rq->timeout = 60*HZ; - if (cgc->quiet) - rq->rq_flags |= RQF_QUIET; - - blk_execute_rq(rq, false); - if (scmd->result) - ret = -EIO; -out: - blk_mq_free_request(rq); - return ret; -} - -static const char *sense_key_string(__u8 index) -{ - static const char * const info[] = { - "No sense", "Recovered error", "Not ready", - "Medium error", "Hardware error", "Illegal request", - "Unit attention", "Data protect", "Blank check", - }; - - return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; -} - -/* - * A generic sense dump / resolve mechanism should be implemented across - * all ATAPI + SCSI devices. - */ -static void pkt_dump_sense(struct pktcdvd_device *pd, - struct packet_command *cgc) -{ - struct 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); - bio_uninit(bio); - if (atomic_dec_and_test(&pkt->io_wait)) { - atomic_inc(&pkt->run_sm); - wake_up(&pd->wqueue); - } - pkt_bio_finished(pd); -} - -static void pkt_end_io_packet_write(struct bio *bio) -{ - struct packet_data *pkt = bio->bi_private; - struct pktcdvd_device *pd = pkt->pd; - BUG_ON(!pd); - - pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status); - - pd->stats.pkt_ended++; - - bio_uninit(bio); - pkt_bio_finished(pd); - atomic_dec(&pkt->io_wait); - atomic_inc(&pkt->run_sm); - wake_up(&pd->wqueue); -} - -/* - * Schedule reads for the holes in a packet - */ -static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) -{ - 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_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ); - bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); - bio->bi_end_io = pkt_end_io_read; - bio->bi_private = pkt; - - p = (f * CD_FRAMESIZE) / PAGE_SIZE; - offset = (f * CD_FRAMESIZE) % PAGE_SIZE; - 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); - 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; - - 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 - */ - if (pd->congested && - pd->bio_queue_size <= pd->write_congestion_off) { - pd->congested = false; - wake_up_var(&pd->congested); - } - spin_unlock(&pd->lock); - - pkt->sleep_time = max(PACKET_WAIT_TIME, 1); - pkt_set_state(pkt, PACKET_WAITING_STATE); - atomic_set(&pkt->run_sm, 1); - - spin_lock(&pd->cdrw.active_list_lock); - list_add(&pkt->list, &pd->cdrw.pkt_active_list); - spin_unlock(&pd->cdrw.active_list_lock); - - return 1; -} - -/** - * bio_list_copy_data - copy contents of data buffers from one chain of bios to - * another - * @src: source bio list - * @dst: destination bio list - * - * Stops when it reaches the end of either the @src list or @dst list - that is, - * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of - * bios). - */ -static void bio_list_copy_data(struct bio *dst, struct bio *src) -{ - struct bvec_iter src_iter = src->bi_iter; - struct bvec_iter dst_iter = dst->bi_iter; - - while (1) { - if (!src_iter.bi_size) { - src = src->bi_next; - if (!src) - break; - - src_iter = src->bi_iter; - } - - if (!dst_iter.bi_size) { - dst = dst->bi_next; - if (!dst) - break; - - dst_iter = dst->bi_iter; - } - - bio_copy_data_iter(dst, &dst_iter, src, &src_iter); - } -} - -/* - * Assemble a bio to write one packet and queue the bio for processing - * by the underlying block device. - */ -static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) -{ - int f; - - bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames, - REQ_OP_WRITE); - pkt->w_bio->bi_iter.bi_sector = pkt->sector; - pkt->w_bio->bi_end_io = pkt_end_io_packet_write; - pkt->w_bio->bi_private = pkt; - - /* XXX: locking? */ - for (f = 0; f < pkt->frames; f++) { - struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; - unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE; - - if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset)) - BUG(); - } - 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); - 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_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set); - struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO); - - psd->pd = pd; - psd->bio = bio; - cloned_bio->bi_private = psd; - cloned_bio->bi_end_io = pkt_end_io_read_cloned; - pd->stats.secs_r += bio_sectors(bio); - pkt_queue_bio(pd, cloned_bio); -} - -static void pkt_make_request_write(struct request_queue *q, struct bio *bio) -{ - struct pktcdvd_device *pd = q->queuedata; - sector_t zone; - struct packet_data *pkt; - int was_empty, blocked_bio; - struct pkt_rb_node *node; - - zone = get_zone(bio->bi_iter.bi_sector, pd); - - /* - * If we find a matching packet in state WAITING or READ_WAIT, we can - * just append this bio to that packet. - */ - spin_lock(&pd->cdrw.active_list_lock); - blocked_bio = 0; - list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { - if (pkt->sector == zone) { - spin_lock(&pkt->lock); - if ((pkt->state == PACKET_WAITING_STATE) || - (pkt->state == PACKET_READ_WAIT_STATE)) { - bio_list_add(&pkt->orig_bios, bio); - pkt->write_size += - bio->bi_iter.bi_size / CD_FRAMESIZE; - if ((pkt->write_size >= pkt->frames) && - (pkt->state == PACKET_WAITING_STATE)) { - atomic_inc(&pkt->run_sm); - wake_up(&pd->wqueue); - } - spin_unlock(&pkt->lock); - spin_unlock(&pd->cdrw.active_list_lock); - return; - } else { - blocked_bio = 1; - } - spin_unlock(&pkt->lock); - } - } - spin_unlock(&pd->cdrw.active_list_lock); - - /* - * Test if there is enough room left in the bio work queue - * (queue size >= congestion on mark). - * If not, wait till the work queue size is below the congestion off mark. - */ - spin_lock(&pd->lock); - if (pd->write_congestion_on > 0 - && pd->bio_queue_size >= pd->write_congestion_on) { - struct wait_bit_queue_entry wqe; - - init_wait_var_entry(&wqe, &pd->congested, 0); - for (;;) { - prepare_to_wait_event(__var_waitqueue(&pd->congested), - &wqe.wq_entry, - TASK_UNINTERRUPTIBLE); - if (pd->bio_queue_size <= pd->write_congestion_off) - break; - pd->congested = true; - spin_unlock(&pd->lock); - schedule(); - spin_lock(&pd->lock); - } - } - spin_unlock(&pd->lock); - - /* - * No matching packet found. Store the bio in the work queue. - */ - node = mempool_alloc(&pd->rb_pool, GFP_NOIO); - node->bio = bio; - spin_lock(&pd->lock); - BUG_ON(pd->bio_queue_size < 0); - was_empty = (pd->bio_queue_size == 0); - pkt_rbtree_insert(pd, node); - spin_unlock(&pd->lock); - - /* - * Wake up the worker thread. - */ - atomic_set(&pd->scan_queue, 1); - if (was_empty) { - /* This wake_up is required for correct operation */ - wake_up(&pd->wqueue); - } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { - /* - * This wake up is not required for correct operation, - * but improves performance in some cases. - */ - wake_up(&pd->wqueue); - } -} - -static void pkt_submit_bio(struct bio *bio) -{ - struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata; - struct bio *split; - - bio = bio_split_to_limits(bio); - - 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; - } - - 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; -end_io: - bio_io_error(bio); -} - -static void pkt_init_queue(struct pktcdvd_device *pd) -{ - struct request_queue *q = pd->disk->queue; - - blk_queue_logical_block_size(q, CD_FRAMESIZE); - blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); - q->queuedata = pd; -} - -static int pkt_seq_show(struct seq_file *m, void *p) -{ - struct pktcdvd_device *pd = m->private; - char *msg; - int states[PACKET_NUM_STATES]; - - seq_printf(m, "Writer %s mapped to %pg:\n", pd->name, pd->bdev); - - 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; - struct block_device *bdev; - struct scsi_device *sdev; - - 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, "%pg already setup\n", pd2->bdev); - 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); - sdev = scsi_device_from_queue(bdev->bd_disk->queue); - if (!sdev) { - blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); - return -EINVAL; - } - put_device(&sdev->sdev_gendev); - - /* This is safe, since we have a reference from open(). */ - __module_get(THIS_MODULE); - - pd->bdev = bdev; - set_blocksize(bdev, CD_FRAMESIZE); - - pkt_init_queue(pd); - - atomic_set(&pd->cdrw.pending_bios, 0); - pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->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 %pg\n", bdev); - 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 = blk_alloc_disk(NUMA_NO_NODE); - if (!disk) - goto out_mem; - pd->disk = disk; - disk->major = pktdev_major; - disk->first_minor = idx; - disk->minors = 1; - disk->fops = &pktcdvd_ops; - disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; - strcpy(disk->disk_name, pd->name); - disk->private_data = pd; - - pd->pkt_dev = MKDEV(pktdev_major, idx); - ret = pkt_new_dev(pd, dev); - if (ret) - goto out_mem2; - - /* inherit events of the host device */ - disk->events = pd->bdev->bd_disk->events; - - ret = add_disk(disk); - if (ret) - goto out_mem2; - - pkt_sysfs_dev_new(pd); - pkt_debugfs_dev_new(pd); - - pkt_devs[idx] = pd; - if (pkt_dev) - *pkt_dev = pd->pkt_dev; - - mutex_unlock(&ctl_mutex); - return 0; - -out_mem2: - put_disk(disk); -out_mem: - mempool_exit(&pd->rb_pool); - kfree(pd); -out_mutex: - mutex_unlock(&ctl_mutex); - pr_err("setup of pktcdvd device failed\n"); - return ret; -} - -/* - * Tear down mapping from pktcdvd device to CD-ROM device. - */ -static int pkt_remove_dev(dev_t pkt_dev) -{ - struct pktcdvd_device *pd; - 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); - 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 "); -MODULE_LICENSE("GPL"); - -module_init(pkt_init); -module_exit(pkt_exit); diff --git a/include/linux/pktcdvd.h b/include/linux/pktcdvd.h deleted file mode 100644 index f9c5ac80d59b..000000000000 --- a/include/linux/pktcdvd.h +++ /dev/null @@ -1,197 +0,0 @@ -/* - * Copyright (C) 2000 Jens Axboe - * Copyright (C) 2001-2004 Peter Osterlund - * - * 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-R, CD-RW, DVD-R, and - * DVD-RW devices. - * - */ -#ifndef __PKTCDVD_H -#define __PKTCDVD_H - -#include -#include -#include -#include -#include -#include -#include - -/* default bio write queue congestion marks */ -#define PKT_WRITE_CONGESTION_ON 10000 -#define PKT_WRITE_CONGESTION_OFF 9000 - - -struct packet_settings -{ - __u32 size; /* packet size in (512 byte) sectors */ - __u8 fp; /* fixed packets */ - __u8 link_loss; /* the rest is specified - * as per Mt Fuji */ - __u8 write_type; - __u8 track_mode; - __u8 block_mode; -}; - -/* - * Very crude stats for now - */ -struct packet_stats -{ - unsigned long pkt_started; - unsigned long pkt_ended; - unsigned long secs_w; - unsigned long secs_rg; - unsigned long secs_r; -}; - -struct packet_cdrw -{ - struct list_head pkt_free_list; - struct list_head pkt_active_list; - spinlock_t active_list_lock; /* Serialize access to pkt_active_list */ - struct task_struct *thread; - atomic_t pending_bios; -}; - -/* - * Switch to high speed reading after reading this many kilobytes - * with no interspersed writes. - */ -#define HI_SPEED_SWITCH 512 - -struct packet_iosched -{ - atomic_t attention; /* Set to non-zero when queue processing is needed */ - int writing; /* Non-zero when writing, zero when reading */ - spinlock_t lock; /* Protecting read/write queue manipulations */ - struct bio_list read_queue; - struct bio_list write_queue; - sector_t last_write; /* The sector where the last write ended */ - int successive_reads; -}; - -/* - * 32 buffers of 2048 bytes - */ -#if (PAGE_SIZE % CD_FRAMESIZE) != 0 -#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE" -#endif -#define PACKET_MAX_SIZE 128 -#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE) -#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9) - -enum packet_data_state { - PACKET_IDLE_STATE, /* Not used at the moment */ - PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */ - /* we don't have to do as much */ - /* data gathering */ - PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */ - PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */ - PACKET_RECOVERY_STATE, /* Recover after read/write errors */ - PACKET_FINISHED_STATE, /* After write has finished */ - - PACKET_NUM_STATES /* Number of possible states */ -}; - -/* - * Information needed for writing a single packet - */ -struct pktcdvd_device; - -struct packet_data -{ - struct list_head list; - - spinlock_t lock; /* Lock protecting state transitions and */ - /* orig_bios list */ - - struct bio_list orig_bios; /* Original bios passed to pkt_make_request */ - /* that will be handled by this packet */ - int write_size; /* Total size of all bios in the orig_bios */ - /* list, measured in number of frames */ - - struct bio *w_bio; /* The bio we will send to the real CD */ - /* device once we have all data for the */ - /* packet we are going to write */ - sector_t sector; /* First sector in this packet */ - int frames; /* Number of frames in this packet */ - - enum packet_data_state state; /* Current state */ - atomic_t run_sm; /* Incremented whenever the state */ - /* machine needs to be run */ - long sleep_time; /* Set this to non-zero to make the state */ - /* machine run after this many jiffies. */ - - atomic_t io_wait; /* Number of pending IO operations */ - atomic_t io_errors; /* Number of read/write errors during IO */ - - struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */ - struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE]; - - int cache_valid; /* If non-zero, the data for the zone defined */ - /* by the sector variable is completely cached */ - /* in the pages[] vector. */ - - int id; /* ID number for debugging */ - struct pktcdvd_device *pd; -}; - -struct pkt_rb_node { - struct rb_node rb_node; - struct bio *bio; -}; - -struct packet_stacked_data -{ - struct bio *bio; /* Original read request bio */ - struct pktcdvd_device *pd; -}; -#define PSD_POOL_SIZE 64 - -struct pktcdvd_device -{ - struct block_device *bdev; /* dev attached */ - dev_t pkt_dev; /* our dev */ - char name[20]; - struct packet_settings settings; - struct packet_stats stats; - int refcnt; /* Open count */ - int write_speed; /* current write speed, kB/s */ - int read_speed; /* current read speed, kB/s */ - unsigned long offset; /* start offset */ - __u8 mode_offset; /* 0 / 8 */ - __u8 type; - unsigned long flags; - __u16 mmc3_profile; - __u32 nwa; /* next writable address */ - __u32 lra; /* last recorded address */ - struct packet_cdrw cdrw; - wait_queue_head_t wqueue; - - spinlock_t lock; /* Serialize access to bio_queue */ - struct rb_root bio_queue; /* Work queue of bios we need to handle */ - int bio_queue_size; /* Number of nodes in bio_queue */ - bool congested; /* Someone is waiting for bio_queue_size - * to drop. */ - sector_t current_sector; /* Keep track of where the elevator is */ - atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */ - /* needs to be run. */ - mempool_t rb_pool; /* mempool for pkt_rb_node allocations */ - - struct packet_iosched iosched; - struct gendisk *disk; - - int write_congestion_off; - int write_congestion_on; - - struct device *dev; /* sysfs pktcdvd[0-7] dev */ - - struct dentry *dfs_d_root; /* debugfs: devname directory */ - struct dentry *dfs_f_info; /* debugfs: info file */ -}; - -#endif /* __PKTCDVD_H */ diff --git a/include/uapi/linux/pktcdvd.h b/include/uapi/linux/pktcdvd.h deleted file mode 100644 index 9cbb55d21c94..000000000000 --- a/include/uapi/linux/pktcdvd.h +++ /dev/null @@ -1,112 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ -/* - * Copyright (C) 2000 Jens Axboe - * Copyright (C) 2001-2004 Peter Osterlund - * - * 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-R, CD-RW, DVD-R, and - * DVD-RW devices. - * - */ -#ifndef _UAPI__PKTCDVD_H -#define _UAPI__PKTCDVD_H - -#include - -/* - * 1 for normal debug messages, 2 is very verbose. 0 to turn it off. - */ -#define PACKET_DEBUG 1 - -#define MAX_WRITERS 8 - -#define PKT_RB_POOL_SIZE 512 - -/* - * How long we should hold a non-full packet before starting data gathering. - */ -#define PACKET_WAIT_TIME (HZ * 5 / 1000) - -/* - * use drive write caching -- we need deferred error handling to be - * able to successfully recover with this option (drive will return good - * status as soon as the cdb is validated). - */ -#if defined(CONFIG_CDROM_PKTCDVD_WCACHE) -#define USE_WCACHING 1 -#else -#define USE_WCACHING 0 -#endif - -/* - * No user-servicable parts beyond this point -> - */ - -/* - * device types - */ -#define PACKET_CDR 1 -#define PACKET_CDRW 2 -#define PACKET_DVDR 3 -#define PACKET_DVDRW 4 - -/* - * flags - */ -#define PACKET_WRITABLE 1 /* pd is writable */ -#define PACKET_NWA_VALID 2 /* next writable address valid */ -#define PACKET_LRA_VALID 3 /* last recorded address valid */ -#define PACKET_MERGE_SEGS 4 /* perform segment merging to keep */ - /* underlying cdrom device happy */ - -/* - * Disc status -- from READ_DISC_INFO - */ -#define PACKET_DISC_EMPTY 0 -#define PACKET_DISC_INCOMPLETE 1 -#define PACKET_DISC_COMPLETE 2 -#define PACKET_DISC_OTHER 3 - -/* - * write type, and corresponding data block type - */ -#define PACKET_MODE1 1 -#define PACKET_MODE2 2 -#define PACKET_BLOCK_MODE1 8 -#define PACKET_BLOCK_MODE2 10 - -/* - * Last session/border status - */ -#define PACKET_SESSION_EMPTY 0 -#define PACKET_SESSION_INCOMPLETE 1 -#define PACKET_SESSION_RESERVED 2 -#define PACKET_SESSION_COMPLETE 3 - -#define PACKET_MCN "4a656e734178626f65323030300000" - -#undef PACKET_USE_LS - -#define PKT_CTRL_CMD_SETUP 0 -#define PKT_CTRL_CMD_TEARDOWN 1 -#define PKT_CTRL_CMD_STATUS 2 - -struct pkt_ctrl_command { - __u32 command; /* in: Setup, teardown, status */ - __u32 dev_index; /* in/out: Device index */ - __u32 dev; /* in/out: Device nr for cdrw device */ - __u32 pkt_dev; /* in/out: Device nr for packet device */ - __u32 num_devices; /* out: Largest device index + 1 */ - __u32 padding; /* Not used */ -}; - -/* - * packet ioctls - */ -#define PACKET_IOCTL_MAGIC ('X') -#define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command) - - -#endif /* _UAPI__PKTCDVD_H */