v4.19.13 snapshot.
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
new file mode 100644
index 0000000..8a254bb
--- /dev/null
+++ b/drivers/scsi/sg.c
@@ -0,0 +1,2622 @@
+/*
+ * History:
+ * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
+ * to allow user process control of SCSI devices.
+ * Development Sponsored by Killy Corp. NY NY
+ *
+ * Original driver (sg.c):
+ * Copyright (C) 1992 Lawrence Foard
+ * Version 2 and 3 extensions to driver:
+ * Copyright (C) 1998 - 2014 Douglas Gilbert
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ */
+
+static int sg_version_num = 30536; /* 2 digits for each component */
+#define SG_VERSION_STR "3.5.36"
+
+/*
+ * D. P. Gilbert (dgilbert@interlog.com), notes:
+ * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
+ * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
+ * (otherwise the macros compile to empty statements).
+ *
+ */
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/mtio.h>
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/moduleparam.h>
+#include <linux/cdev.h>
+#include <linux/idr.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/blktrace_api.h>
+#include <linux/mutex.h>
+#include <linux/atomic.h>
+#include <linux/ratelimit.h>
+#include <linux/uio.h>
+#include <linux/cred.h> /* for sg_check_file_access() */
+
+#include "scsi.h"
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/sg.h>
+
+#include "scsi_logging.h"
+
+#ifdef CONFIG_SCSI_PROC_FS
+#include <linux/proc_fs.h>
+static char *sg_version_date = "20140603";
+
+static int sg_proc_init(void);
+#endif
+
+#define SG_ALLOW_DIO_DEF 0
+
+#define SG_MAX_DEVS 32768
+
+/* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
+ * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
+ * than 16 bytes are "variable length" whose length is a multiple of 4
+ */
+#define SG_MAX_CDB_SIZE 252
+
+#define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
+
+int sg_big_buff = SG_DEF_RESERVED_SIZE;
+/* N.B. This variable is readable and writeable via
+ /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
+ of this size (or less if there is not enough memory) will be reserved
+ for use by this file descriptor. [Deprecated usage: this variable is also
+ readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
+ the kernel (i.e. it is not a module).] */
+static int def_reserved_size = -1; /* picks up init parameter */
+static int sg_allow_dio = SG_ALLOW_DIO_DEF;
+
+static int scatter_elem_sz = SG_SCATTER_SZ;
+static int scatter_elem_sz_prev = SG_SCATTER_SZ;
+
+#define SG_SECTOR_SZ 512
+
+static int sg_add_device(struct device *, struct class_interface *);
+static void sg_remove_device(struct device *, struct class_interface *);
+
+static DEFINE_IDR(sg_index_idr);
+static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
+ file descriptor list for device */
+
+static struct class_interface sg_interface = {
+ .add_dev = sg_add_device,
+ .remove_dev = sg_remove_device,
+};
+
+typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
+ unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
+ unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
+ unsigned bufflen; /* Size of (aggregate) data buffer */
+ struct page **pages;
+ int page_order;
+ char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
+ unsigned char cmd_opcode; /* first byte of command */
+} Sg_scatter_hold;
+
+struct sg_device; /* forward declarations */
+struct sg_fd;
+
+typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
+ struct list_head entry; /* list entry */
+ struct sg_fd *parentfp; /* NULL -> not in use */
+ Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
+ sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
+ unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
+ char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
+ char orphan; /* 1 -> drop on sight, 0 -> normal */
+ char sg_io_owned; /* 1 -> packet belongs to SG_IO */
+ /* done protected by rq_list_lock */
+ char done; /* 0->before bh, 1->before read, 2->read */
+ struct request *rq;
+ struct bio *bio;
+ struct execute_work ew;
+} Sg_request;
+
+typedef struct sg_fd { /* holds the state of a file descriptor */
+ struct list_head sfd_siblings; /* protected by device's sfd_lock */
+ struct sg_device *parentdp; /* owning device */
+ wait_queue_head_t read_wait; /* queue read until command done */
+ rwlock_t rq_list_lock; /* protect access to list in req_arr */
+ struct mutex f_mutex; /* protect against changes in this fd */
+ int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
+ int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
+ Sg_scatter_hold reserve; /* buffer held for this file descriptor */
+ struct list_head rq_list; /* head of request list */
+ struct fasync_struct *async_qp; /* used by asynchronous notification */
+ Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
+ char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
+ char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
+ unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
+ char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
+ char mmap_called; /* 0 -> mmap() never called on this fd */
+ char res_in_use; /* 1 -> 'reserve' array in use */
+ struct kref f_ref;
+ struct execute_work ew;
+} Sg_fd;
+
+typedef struct sg_device { /* holds the state of each scsi generic device */
+ struct scsi_device *device;
+ wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
+ struct mutex open_rel_lock; /* held when in open() or release() */
+ int sg_tablesize; /* adapter's max scatter-gather table size */
+ u32 index; /* device index number */
+ struct list_head sfds;
+ rwlock_t sfd_lock; /* protect access to sfd list */
+ atomic_t detaching; /* 0->device usable, 1->device detaching */
+ bool exclude; /* 1->open(O_EXCL) succeeded and is active */
+ int open_cnt; /* count of opens (perhaps < num(sfds) ) */
+ char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
+ struct gendisk *disk;
+ struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
+ struct kref d_ref;
+} Sg_device;
+
+/* tasklet or soft irq callback */
+static void sg_rq_end_io(struct request *rq, blk_status_t status);
+static int sg_start_req(Sg_request *srp, unsigned char *cmd);
+static int sg_finish_rem_req(Sg_request * srp);
+static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
+static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
+ Sg_request * srp);
+static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
+ const char __user *buf, size_t count, int blocking,
+ int read_only, int sg_io_owned, Sg_request **o_srp);
+static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
+ unsigned char *cmnd, int timeout, int blocking);
+static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
+static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
+static void sg_build_reserve(Sg_fd * sfp, int req_size);
+static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
+static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
+static Sg_fd *sg_add_sfp(Sg_device * sdp);
+static void sg_remove_sfp(struct kref *);
+static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
+static Sg_request *sg_add_request(Sg_fd * sfp);
+static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
+static Sg_device *sg_get_dev(int dev);
+static void sg_device_destroy(struct kref *kref);
+
+#define SZ_SG_HEADER sizeof(struct sg_header)
+#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
+#define SZ_SG_IOVEC sizeof(sg_iovec_t)
+#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
+
+#define sg_printk(prefix, sdp, fmt, a...) \
+ sdev_prefix_printk(prefix, (sdp)->device, \
+ (sdp)->disk->disk_name, fmt, ##a)
+
+/*
+ * The SCSI interfaces that use read() and write() as an asynchronous variant of
+ * ioctl(..., SG_IO, ...) are fundamentally unsafe, since there are lots of ways
+ * to trigger read() and write() calls from various contexts with elevated
+ * privileges. This can lead to kernel memory corruption (e.g. if these
+ * interfaces are called through splice()) and privilege escalation inside
+ * userspace (e.g. if a process with access to such a device passes a file
+ * descriptor to a SUID binary as stdin/stdout/stderr).
+ *
+ * This function provides protection for the legacy API by restricting the
+ * calling context.
+ */
+static int sg_check_file_access(struct file *filp, const char *caller)
+{
+ if (filp->f_cred != current_real_cred()) {
+ pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
+ caller, task_tgid_vnr(current), current->comm);
+ return -EPERM;
+ }
+ if (uaccess_kernel()) {
+ pr_err_once("%s: process %d (%s) called from kernel context, this is not allowed.\n",
+ caller, task_tgid_vnr(current), current->comm);
+ return -EACCES;
+ }
+ return 0;
+}
+
+static int sg_allow_access(struct file *filp, unsigned char *cmd)
+{
+ struct sg_fd *sfp = filp->private_data;
+
+ if (sfp->parentdp->device->type == TYPE_SCANNER)
+ return 0;
+
+ return blk_verify_command(cmd, filp->f_mode);
+}
+
+static int
+open_wait(Sg_device *sdp, int flags)
+{
+ int retval = 0;
+
+ if (flags & O_EXCL) {
+ while (sdp->open_cnt > 0) {
+ mutex_unlock(&sdp->open_rel_lock);
+ retval = wait_event_interruptible(sdp->open_wait,
+ (atomic_read(&sdp->detaching) ||
+ !sdp->open_cnt));
+ mutex_lock(&sdp->open_rel_lock);
+
+ if (retval) /* -ERESTARTSYS */
+ return retval;
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ }
+ } else {
+ while (sdp->exclude) {
+ mutex_unlock(&sdp->open_rel_lock);
+ retval = wait_event_interruptible(sdp->open_wait,
+ (atomic_read(&sdp->detaching) ||
+ !sdp->exclude));
+ mutex_lock(&sdp->open_rel_lock);
+
+ if (retval) /* -ERESTARTSYS */
+ return retval;
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ }
+ }
+
+ return retval;
+}
+
+/* Returns 0 on success, else a negated errno value */
+static int
+sg_open(struct inode *inode, struct file *filp)
+{
+ int dev = iminor(inode);
+ int flags = filp->f_flags;
+ struct request_queue *q;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ int retval;
+
+ nonseekable_open(inode, filp);
+ if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
+ return -EPERM; /* Can't lock it with read only access */
+ sdp = sg_get_dev(dev);
+ if (IS_ERR(sdp))
+ return PTR_ERR(sdp);
+
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_open: flags=0x%x\n", flags));
+
+ /* This driver's module count bumped by fops_get in <linux/fs.h> */
+ /* Prevent the device driver from vanishing while we sleep */
+ retval = scsi_device_get(sdp->device);
+ if (retval)
+ goto sg_put;
+
+ retval = scsi_autopm_get_device(sdp->device);
+ if (retval)
+ goto sdp_put;
+
+ /* scsi_block_when_processing_errors() may block so bypass
+ * check if O_NONBLOCK. Permits SCSI commands to be issued
+ * during error recovery. Tread carefully. */
+ if (!((flags & O_NONBLOCK) ||
+ scsi_block_when_processing_errors(sdp->device))) {
+ retval = -ENXIO;
+ /* we are in error recovery for this device */
+ goto error_out;
+ }
+
+ mutex_lock(&sdp->open_rel_lock);
+ if (flags & O_NONBLOCK) {
+ if (flags & O_EXCL) {
+ if (sdp->open_cnt > 0) {
+ retval = -EBUSY;
+ goto error_mutex_locked;
+ }
+ } else {
+ if (sdp->exclude) {
+ retval = -EBUSY;
+ goto error_mutex_locked;
+ }
+ }
+ } else {
+ retval = open_wait(sdp, flags);
+ if (retval) /* -ERESTARTSYS or -ENODEV */
+ goto error_mutex_locked;
+ }
+
+ /* N.B. at this point we are holding the open_rel_lock */
+ if (flags & O_EXCL)
+ sdp->exclude = true;
+
+ if (sdp->open_cnt < 1) { /* no existing opens */
+ sdp->sgdebug = 0;
+ q = sdp->device->request_queue;
+ sdp->sg_tablesize = queue_max_segments(q);
+ }
+ sfp = sg_add_sfp(sdp);
+ if (IS_ERR(sfp)) {
+ retval = PTR_ERR(sfp);
+ goto out_undo;
+ }
+
+ filp->private_data = sfp;
+ sdp->open_cnt++;
+ mutex_unlock(&sdp->open_rel_lock);
+
+ retval = 0;
+sg_put:
+ kref_put(&sdp->d_ref, sg_device_destroy);
+ return retval;
+
+out_undo:
+ if (flags & O_EXCL) {
+ sdp->exclude = false; /* undo if error */
+ wake_up_interruptible(&sdp->open_wait);
+ }
+error_mutex_locked:
+ mutex_unlock(&sdp->open_rel_lock);
+error_out:
+ scsi_autopm_put_device(sdp->device);
+sdp_put:
+ scsi_device_put(sdp->device);
+ goto sg_put;
+}
+
+/* Release resources associated with a successful sg_open()
+ * Returns 0 on success, else a negated errno value */
+static int
+sg_release(struct inode *inode, struct file *filp)
+{
+ Sg_device *sdp;
+ Sg_fd *sfp;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
+
+ mutex_lock(&sdp->open_rel_lock);
+ scsi_autopm_put_device(sdp->device);
+ kref_put(&sfp->f_ref, sg_remove_sfp);
+ sdp->open_cnt--;
+
+ /* possibly many open()s waiting on exlude clearing, start many;
+ * only open(O_EXCL)s wait on 0==open_cnt so only start one */
+ if (sdp->exclude) {
+ sdp->exclude = false;
+ wake_up_interruptible_all(&sdp->open_wait);
+ } else if (0 == sdp->open_cnt) {
+ wake_up_interruptible(&sdp->open_wait);
+ }
+ mutex_unlock(&sdp->open_rel_lock);
+ return 0;
+}
+
+static ssize_t
+sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
+{
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ int req_pack_id = -1;
+ sg_io_hdr_t *hp;
+ struct sg_header *old_hdr = NULL;
+ int retval = 0;
+
+ /*
+ * This could cause a response to be stranded. Close the associated
+ * file descriptor to free up any resources being held.
+ */
+ retval = sg_check_file_access(filp, __func__);
+ if (retval)
+ return retval;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_read: count=%d\n", (int) count));
+
+ if (!access_ok(VERIFY_WRITE, buf, count))
+ return -EFAULT;
+ if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
+ old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
+ if (!old_hdr)
+ return -ENOMEM;
+ if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
+ retval = -EFAULT;
+ goto free_old_hdr;
+ }
+ if (old_hdr->reply_len < 0) {
+ if (count >= SZ_SG_IO_HDR) {
+ sg_io_hdr_t *new_hdr;
+ new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
+ if (!new_hdr) {
+ retval = -ENOMEM;
+ goto free_old_hdr;
+ }
+ retval =__copy_from_user
+ (new_hdr, buf, SZ_SG_IO_HDR);
+ req_pack_id = new_hdr->pack_id;
+ kfree(new_hdr);
+ if (retval) {
+ retval = -EFAULT;
+ goto free_old_hdr;
+ }
+ }
+ } else
+ req_pack_id = old_hdr->pack_id;
+ }
+ srp = sg_get_rq_mark(sfp, req_pack_id);
+ if (!srp) { /* now wait on packet to arrive */
+ if (atomic_read(&sdp->detaching)) {
+ retval = -ENODEV;
+ goto free_old_hdr;
+ }
+ if (filp->f_flags & O_NONBLOCK) {
+ retval = -EAGAIN;
+ goto free_old_hdr;
+ }
+ retval = wait_event_interruptible(sfp->read_wait,
+ (atomic_read(&sdp->detaching) ||
+ (srp = sg_get_rq_mark(sfp, req_pack_id))));
+ if (atomic_read(&sdp->detaching)) {
+ retval = -ENODEV;
+ goto free_old_hdr;
+ }
+ if (retval) {
+ /* -ERESTARTSYS as signal hit process */
+ goto free_old_hdr;
+ }
+ }
+ if (srp->header.interface_id != '\0') {
+ retval = sg_new_read(sfp, buf, count, srp);
+ goto free_old_hdr;
+ }
+
+ hp = &srp->header;
+ if (old_hdr == NULL) {
+ old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
+ if (! old_hdr) {
+ retval = -ENOMEM;
+ goto free_old_hdr;
+ }
+ }
+ memset(old_hdr, 0, SZ_SG_HEADER);
+ old_hdr->reply_len = (int) hp->timeout;
+ old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
+ old_hdr->pack_id = hp->pack_id;
+ old_hdr->twelve_byte =
+ ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
+ old_hdr->target_status = hp->masked_status;
+ old_hdr->host_status = hp->host_status;
+ old_hdr->driver_status = hp->driver_status;
+ if ((CHECK_CONDITION & hp->masked_status) ||
+ (DRIVER_SENSE & hp->driver_status))
+ memcpy(old_hdr->sense_buffer, srp->sense_b,
+ sizeof (old_hdr->sense_buffer));
+ switch (hp->host_status) {
+ /* This setup of 'result' is for backward compatibility and is best
+ ignored by the user who should use target, host + driver status */
+ case DID_OK:
+ case DID_PASSTHROUGH:
+ case DID_SOFT_ERROR:
+ old_hdr->result = 0;
+ break;
+ case DID_NO_CONNECT:
+ case DID_BUS_BUSY:
+ case DID_TIME_OUT:
+ old_hdr->result = EBUSY;
+ break;
+ case DID_BAD_TARGET:
+ case DID_ABORT:
+ case DID_PARITY:
+ case DID_RESET:
+ case DID_BAD_INTR:
+ old_hdr->result = EIO;
+ break;
+ case DID_ERROR:
+ old_hdr->result = (srp->sense_b[0] == 0 &&
+ hp->masked_status == GOOD) ? 0 : EIO;
+ break;
+ default:
+ old_hdr->result = EIO;
+ break;
+ }
+
+ /* Now copy the result back to the user buffer. */
+ if (count >= SZ_SG_HEADER) {
+ if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
+ retval = -EFAULT;
+ goto free_old_hdr;
+ }
+ buf += SZ_SG_HEADER;
+ if (count > old_hdr->reply_len)
+ count = old_hdr->reply_len;
+ if (count > SZ_SG_HEADER) {
+ if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
+ retval = -EFAULT;
+ goto free_old_hdr;
+ }
+ }
+ } else
+ count = (old_hdr->result == 0) ? 0 : -EIO;
+ sg_finish_rem_req(srp);
+ sg_remove_request(sfp, srp);
+ retval = count;
+free_old_hdr:
+ kfree(old_hdr);
+ return retval;
+}
+
+static ssize_t
+sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
+{
+ sg_io_hdr_t *hp = &srp->header;
+ int err = 0, err2;
+ int len;
+
+ if (count < SZ_SG_IO_HDR) {
+ err = -EINVAL;
+ goto err_out;
+ }
+ hp->sb_len_wr = 0;
+ if ((hp->mx_sb_len > 0) && hp->sbp) {
+ if ((CHECK_CONDITION & hp->masked_status) ||
+ (DRIVER_SENSE & hp->driver_status)) {
+ int sb_len = SCSI_SENSE_BUFFERSIZE;
+ sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
+ len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
+ len = (len > sb_len) ? sb_len : len;
+ if (copy_to_user(hp->sbp, srp->sense_b, len)) {
+ err = -EFAULT;
+ goto err_out;
+ }
+ hp->sb_len_wr = len;
+ }
+ }
+ if (hp->masked_status || hp->host_status || hp->driver_status)
+ hp->info |= SG_INFO_CHECK;
+ if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
+ err = -EFAULT;
+ goto err_out;
+ }
+err_out:
+ err2 = sg_finish_rem_req(srp);
+ sg_remove_request(sfp, srp);
+ return err ? : err2 ? : count;
+}
+
+static ssize_t
+sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
+{
+ int mxsize, cmd_size, k;
+ int input_size, blocking;
+ unsigned char opcode;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ struct sg_header old_hdr;
+ sg_io_hdr_t *hp;
+ unsigned char cmnd[SG_MAX_CDB_SIZE];
+ int retval;
+
+ retval = sg_check_file_access(filp, __func__);
+ if (retval)
+ return retval;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_write: count=%d\n", (int) count));
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ if (!((filp->f_flags & O_NONBLOCK) ||
+ scsi_block_when_processing_errors(sdp->device)))
+ return -ENXIO;
+
+ if (!access_ok(VERIFY_READ, buf, count))
+ return -EFAULT; /* protects following copy_from_user()s + get_user()s */
+ if (count < SZ_SG_HEADER)
+ return -EIO;
+ if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
+ return -EFAULT;
+ blocking = !(filp->f_flags & O_NONBLOCK);
+ if (old_hdr.reply_len < 0)
+ return sg_new_write(sfp, filp, buf, count,
+ blocking, 0, 0, NULL);
+ if (count < (SZ_SG_HEADER + 6))
+ return -EIO; /* The minimum scsi command length is 6 bytes. */
+
+ if (!(srp = sg_add_request(sfp))) {
+ SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
+ "sg_write: queue full\n"));
+ return -EDOM;
+ }
+ buf += SZ_SG_HEADER;
+ __get_user(opcode, buf);
+ mutex_lock(&sfp->f_mutex);
+ if (sfp->next_cmd_len > 0) {
+ cmd_size = sfp->next_cmd_len;
+ sfp->next_cmd_len = 0; /* reset so only this write() effected */
+ } else {
+ cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
+ if ((opcode >= 0xc0) && old_hdr.twelve_byte)
+ cmd_size = 12;
+ }
+ mutex_unlock(&sfp->f_mutex);
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
+ "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
+/* Determine buffer size. */
+ input_size = count - cmd_size;
+ mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
+ mxsize -= SZ_SG_HEADER;
+ input_size -= SZ_SG_HEADER;
+ if (input_size < 0) {
+ sg_remove_request(sfp, srp);
+ return -EIO; /* User did not pass enough bytes for this command. */
+ }
+ hp = &srp->header;
+ hp->interface_id = '\0'; /* indicator of old interface tunnelled */
+ hp->cmd_len = (unsigned char) cmd_size;
+ hp->iovec_count = 0;
+ hp->mx_sb_len = 0;
+ if (input_size > 0)
+ hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
+ SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
+ else
+ hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
+ hp->dxfer_len = mxsize;
+ if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
+ (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
+ hp->dxferp = (char __user *)buf + cmd_size;
+ else
+ hp->dxferp = NULL;
+ hp->sbp = NULL;
+ hp->timeout = old_hdr.reply_len; /* structure abuse ... */
+ hp->flags = input_size; /* structure abuse ... */
+ hp->pack_id = old_hdr.pack_id;
+ hp->usr_ptr = NULL;
+ if (__copy_from_user(cmnd, buf, cmd_size))
+ return -EFAULT;
+ /*
+ * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
+ * but is is possible that the app intended SG_DXFER_TO_DEV, because there
+ * is a non-zero input_size, so emit a warning.
+ */
+ if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
+ printk_ratelimited(KERN_WARNING
+ "sg_write: data in/out %d/%d bytes "
+ "for SCSI command 0x%x-- guessing "
+ "data in;\n program %s not setting "
+ "count and/or reply_len properly\n",
+ old_hdr.reply_len - (int)SZ_SG_HEADER,
+ input_size, (unsigned int) cmnd[0],
+ current->comm);
+ }
+ k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
+ return (k < 0) ? k : count;
+}
+
+static ssize_t
+sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
+ size_t count, int blocking, int read_only, int sg_io_owned,
+ Sg_request **o_srp)
+{
+ int k;
+ Sg_request *srp;
+ sg_io_hdr_t *hp;
+ unsigned char cmnd[SG_MAX_CDB_SIZE];
+ int timeout;
+ unsigned long ul_timeout;
+
+ if (count < SZ_SG_IO_HDR)
+ return -EINVAL;
+ if (!access_ok(VERIFY_READ, buf, count))
+ return -EFAULT; /* protects following copy_from_user()s + get_user()s */
+
+ sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
+ if (!(srp = sg_add_request(sfp))) {
+ SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_new_write: queue full\n"));
+ return -EDOM;
+ }
+ srp->sg_io_owned = sg_io_owned;
+ hp = &srp->header;
+ if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
+ sg_remove_request(sfp, srp);
+ return -EFAULT;
+ }
+ if (hp->interface_id != 'S') {
+ sg_remove_request(sfp, srp);
+ return -ENOSYS;
+ }
+ if (hp->flags & SG_FLAG_MMAP_IO) {
+ if (hp->dxfer_len > sfp->reserve.bufflen) {
+ sg_remove_request(sfp, srp);
+ return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
+ }
+ if (hp->flags & SG_FLAG_DIRECT_IO) {
+ sg_remove_request(sfp, srp);
+ return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
+ }
+ if (sfp->res_in_use) {
+ sg_remove_request(sfp, srp);
+ return -EBUSY; /* reserve buffer already being used */
+ }
+ }
+ ul_timeout = msecs_to_jiffies(srp->header.timeout);
+ timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
+ if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
+ sg_remove_request(sfp, srp);
+ return -EMSGSIZE;
+ }
+ if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
+ sg_remove_request(sfp, srp);
+ return -EFAULT; /* protects following copy_from_user()s + get_user()s */
+ }
+ if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
+ sg_remove_request(sfp, srp);
+ return -EFAULT;
+ }
+ if (read_only && sg_allow_access(file, cmnd)) {
+ sg_remove_request(sfp, srp);
+ return -EPERM;
+ }
+ k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
+ if (k < 0)
+ return k;
+ if (o_srp)
+ *o_srp = srp;
+ return count;
+}
+
+static int
+sg_common_write(Sg_fd * sfp, Sg_request * srp,
+ unsigned char *cmnd, int timeout, int blocking)
+{
+ int k, at_head;
+ Sg_device *sdp = sfp->parentdp;
+ sg_io_hdr_t *hp = &srp->header;
+
+ srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
+ hp->status = 0;
+ hp->masked_status = 0;
+ hp->msg_status = 0;
+ hp->info = 0;
+ hp->host_status = 0;
+ hp->driver_status = 0;
+ hp->resid = 0;
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
+ (int) cmnd[0], (int) hp->cmd_len));
+
+ if (hp->dxfer_len >= SZ_256M)
+ return -EINVAL;
+
+ k = sg_start_req(srp, cmnd);
+ if (k) {
+ SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_common_write: start_req err=%d\n", k));
+ sg_finish_rem_req(srp);
+ sg_remove_request(sfp, srp);
+ return k; /* probably out of space --> ENOMEM */
+ }
+ if (atomic_read(&sdp->detaching)) {
+ if (srp->bio) {
+ scsi_req_free_cmd(scsi_req(srp->rq));
+ blk_end_request_all(srp->rq, BLK_STS_IOERR);
+ srp->rq = NULL;
+ }
+
+ sg_finish_rem_req(srp);
+ sg_remove_request(sfp, srp);
+ return -ENODEV;
+ }
+
+ hp->duration = jiffies_to_msecs(jiffies);
+ if (hp->interface_id != '\0' && /* v3 (or later) interface */
+ (SG_FLAG_Q_AT_TAIL & hp->flags))
+ at_head = 0;
+ else
+ at_head = 1;
+
+ srp->rq->timeout = timeout;
+ kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
+ blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
+ srp->rq, at_head, sg_rq_end_io);
+ return 0;
+}
+
+static int srp_done(Sg_fd *sfp, Sg_request *srp)
+{
+ unsigned long flags;
+ int ret;
+
+ read_lock_irqsave(&sfp->rq_list_lock, flags);
+ ret = srp->done;
+ read_unlock_irqrestore(&sfp->rq_list_lock, flags);
+ return ret;
+}
+
+static int max_sectors_bytes(struct request_queue *q)
+{
+ unsigned int max_sectors = queue_max_sectors(q);
+
+ max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
+
+ return max_sectors << 9;
+}
+
+static void
+sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)
+{
+ Sg_request *srp;
+ int val;
+ unsigned int ms;
+
+ val = 0;
+ list_for_each_entry(srp, &sfp->rq_list, entry) {
+ if (val >= SG_MAX_QUEUE)
+ break;
+ rinfo[val].req_state = srp->done + 1;
+ rinfo[val].problem =
+ srp->header.masked_status &
+ srp->header.host_status &
+ srp->header.driver_status;
+ if (srp->done)
+ rinfo[val].duration =
+ srp->header.duration;
+ else {
+ ms = jiffies_to_msecs(jiffies);
+ rinfo[val].duration =
+ (ms > srp->header.duration) ?
+ (ms - srp->header.duration) : 0;
+ }
+ rinfo[val].orphan = srp->orphan;
+ rinfo[val].sg_io_owned = srp->sg_io_owned;
+ rinfo[val].pack_id = srp->header.pack_id;
+ rinfo[val].usr_ptr = srp->header.usr_ptr;
+ val++;
+ }
+}
+
+static long
+sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
+{
+ void __user *p = (void __user *)arg;
+ int __user *ip = p;
+ int result, val, read_only;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ unsigned long iflags;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
+ read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
+
+ switch (cmd_in) {
+ case SG_IO:
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ if (!scsi_block_when_processing_errors(sdp->device))
+ return -ENXIO;
+ if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
+ return -EFAULT;
+ result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
+ 1, read_only, 1, &srp);
+ if (result < 0)
+ return result;
+ result = wait_event_interruptible(sfp->read_wait,
+ (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ write_lock_irq(&sfp->rq_list_lock);
+ if (srp->done) {
+ srp->done = 2;
+ write_unlock_irq(&sfp->rq_list_lock);
+ result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
+ return (result < 0) ? result : 0;
+ }
+ srp->orphan = 1;
+ write_unlock_irq(&sfp->rq_list_lock);
+ return result; /* -ERESTARTSYS because signal hit process */
+ case SG_SET_TIMEOUT:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (val < 0)
+ return -EIO;
+ if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
+ val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
+ INT_MAX);
+ sfp->timeout_user = val;
+ sfp->timeout = mult_frac(val, HZ, USER_HZ);
+
+ return 0;
+ case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
+ /* strange ..., for backward compatibility */
+ return sfp->timeout_user;
+ case SG_SET_FORCE_LOW_DMA:
+ /*
+ * N.B. This ioctl never worked properly, but failed to
+ * return an error value. So returning '0' to keep compability
+ * with legacy applications.
+ */
+ return 0;
+ case SG_GET_LOW_DMA:
+ return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
+ case SG_GET_SCSI_ID:
+ if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
+ return -EFAULT;
+ else {
+ sg_scsi_id_t __user *sg_idp = p;
+
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ __put_user((int) sdp->device->host->host_no,
+ &sg_idp->host_no);
+ __put_user((int) sdp->device->channel,
+ &sg_idp->channel);
+ __put_user((int) sdp->device->id, &sg_idp->scsi_id);
+ __put_user((int) sdp->device->lun, &sg_idp->lun);
+ __put_user((int) sdp->device->type, &sg_idp->scsi_type);
+ __put_user((short) sdp->device->host->cmd_per_lun,
+ &sg_idp->h_cmd_per_lun);
+ __put_user((short) sdp->device->queue_depth,
+ &sg_idp->d_queue_depth);
+ __put_user(0, &sg_idp->unused[0]);
+ __put_user(0, &sg_idp->unused[1]);
+ return 0;
+ }
+ case SG_SET_FORCE_PACK_ID:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ sfp->force_packid = val ? 1 : 0;
+ return 0;
+ case SG_GET_PACK_ID:
+ if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
+ return -EFAULT;
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ list_for_each_entry(srp, &sfp->rq_list, entry) {
+ if ((1 == srp->done) && (!srp->sg_io_owned)) {
+ read_unlock_irqrestore(&sfp->rq_list_lock,
+ iflags);
+ __put_user(srp->header.pack_id, ip);
+ return 0;
+ }
+ }
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ __put_user(-1, ip);
+ return 0;
+ case SG_GET_NUM_WAITING:
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ val = 0;
+ list_for_each_entry(srp, &sfp->rq_list, entry) {
+ if ((1 == srp->done) && (!srp->sg_io_owned))
+ ++val;
+ }
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return put_user(val, ip);
+ case SG_GET_SG_TABLESIZE:
+ return put_user(sdp->sg_tablesize, ip);
+ case SG_SET_RESERVED_SIZE:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (val < 0)
+ return -EINVAL;
+ val = min_t(int, val,
+ max_sectors_bytes(sdp->device->request_queue));
+ mutex_lock(&sfp->f_mutex);
+ if (val != sfp->reserve.bufflen) {
+ if (sfp->mmap_called ||
+ sfp->res_in_use) {
+ mutex_unlock(&sfp->f_mutex);
+ return -EBUSY;
+ }
+
+ sg_remove_scat(sfp, &sfp->reserve);
+ sg_build_reserve(sfp, val);
+ }
+ mutex_unlock(&sfp->f_mutex);
+ return 0;
+ case SG_GET_RESERVED_SIZE:
+ val = min_t(int, sfp->reserve.bufflen,
+ max_sectors_bytes(sdp->device->request_queue));
+ return put_user(val, ip);
+ case SG_SET_COMMAND_Q:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ sfp->cmd_q = val ? 1 : 0;
+ return 0;
+ case SG_GET_COMMAND_Q:
+ return put_user((int) sfp->cmd_q, ip);
+ case SG_SET_KEEP_ORPHAN:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ sfp->keep_orphan = val;
+ return 0;
+ case SG_GET_KEEP_ORPHAN:
+ return put_user((int) sfp->keep_orphan, ip);
+ case SG_NEXT_CMD_LEN:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (val > SG_MAX_CDB_SIZE)
+ return -ENOMEM;
+ sfp->next_cmd_len = (val > 0) ? val : 0;
+ return 0;
+ case SG_GET_VERSION_NUM:
+ return put_user(sg_version_num, ip);
+ case SG_GET_ACCESS_COUNT:
+ /* faked - we don't have a real access count anymore */
+ val = (sdp->device ? 1 : 0);
+ return put_user(val, ip);
+ case SG_GET_REQUEST_TABLE:
+ if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
+ return -EFAULT;
+ else {
+ sg_req_info_t *rinfo;
+
+ rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO,
+ GFP_KERNEL);
+ if (!rinfo)
+ return -ENOMEM;
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ sg_fill_request_table(sfp, rinfo);
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ result = __copy_to_user(p, rinfo,
+ SZ_SG_REQ_INFO * SG_MAX_QUEUE);
+ result = result ? -EFAULT : 0;
+ kfree(rinfo);
+ return result;
+ }
+ case SG_EMULATED_HOST:
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ return put_user(sdp->device->host->hostt->emulated, ip);
+ case SCSI_IOCTL_SEND_COMMAND:
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
+ case SG_SET_DEBUG:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ sdp->sgdebug = (char) val;
+ return 0;
+ case BLKSECTGET:
+ return put_user(max_sectors_bytes(sdp->device->request_queue),
+ ip);
+ case BLKTRACESETUP:
+ return blk_trace_setup(sdp->device->request_queue,
+ sdp->disk->disk_name,
+ MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
+ NULL, p);
+ case BLKTRACESTART:
+ return blk_trace_startstop(sdp->device->request_queue, 1);
+ case BLKTRACESTOP:
+ return blk_trace_startstop(sdp->device->request_queue, 0);
+ case BLKTRACETEARDOWN:
+ return blk_trace_remove(sdp->device->request_queue);
+ case SCSI_IOCTL_GET_IDLUN:
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ case SCSI_IOCTL_PROBE_HOST:
+ case SG_GET_TRANSFORM:
+ case SG_SCSI_RESET:
+ if (atomic_read(&sdp->detaching))
+ return -ENODEV;
+ break;
+ default:
+ if (read_only)
+ return -EPERM; /* don't know so take safe approach */
+ break;
+ }
+
+ result = scsi_ioctl_block_when_processing_errors(sdp->device,
+ cmd_in, filp->f_flags & O_NDELAY);
+ if (result)
+ return result;
+ return scsi_ioctl(sdp->device, cmd_in, p);
+}
+
+#ifdef CONFIG_COMPAT
+static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
+{
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ struct scsi_device *sdev;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+
+ sdev = sdp->device;
+ if (sdev->host->hostt->compat_ioctl) {
+ int ret;
+
+ ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
+
+ return ret;
+ }
+
+ return -ENOIOCTLCMD;
+}
+#endif
+
+static __poll_t
+sg_poll(struct file *filp, poll_table * wait)
+{
+ __poll_t res = 0;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ int count = 0;
+ unsigned long iflags;
+
+ sfp = filp->private_data;
+ if (!sfp)
+ return EPOLLERR;
+ sdp = sfp->parentdp;
+ if (!sdp)
+ return EPOLLERR;
+ poll_wait(filp, &sfp->read_wait, wait);
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ list_for_each_entry(srp, &sfp->rq_list, entry) {
+ /* if any read waiting, flag it */
+ if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
+ res = EPOLLIN | EPOLLRDNORM;
+ ++count;
+ }
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+
+ if (atomic_read(&sdp->detaching))
+ res |= EPOLLHUP;
+ else if (!sfp->cmd_q) {
+ if (0 == count)
+ res |= EPOLLOUT | EPOLLWRNORM;
+ } else if (count < SG_MAX_QUEUE)
+ res |= EPOLLOUT | EPOLLWRNORM;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_poll: res=0x%x\n", (__force u32) res));
+ return res;
+}
+
+static int
+sg_fasync(int fd, struct file *filp, int mode)
+{
+ Sg_device *sdp;
+ Sg_fd *sfp;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_fasync: mode=%d\n", mode));
+
+ return fasync_helper(fd, filp, mode, &sfp->async_qp);
+}
+
+static vm_fault_t
+sg_vma_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ Sg_fd *sfp;
+ unsigned long offset, len, sa;
+ Sg_scatter_hold *rsv_schp;
+ int k, length;
+
+ if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
+ return VM_FAULT_SIGBUS;
+ rsv_schp = &sfp->reserve;
+ offset = vmf->pgoff << PAGE_SHIFT;
+ if (offset >= rsv_schp->bufflen)
+ return VM_FAULT_SIGBUS;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_vma_fault: offset=%lu, scatg=%d\n",
+ offset, rsv_schp->k_use_sg));
+ sa = vma->vm_start;
+ length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
+ len = vma->vm_end - sa;
+ len = (len < length) ? len : length;
+ if (offset < len) {
+ struct page *page = nth_page(rsv_schp->pages[k],
+ offset >> PAGE_SHIFT);
+ get_page(page); /* increment page count */
+ vmf->page = page;
+ return 0; /* success */
+ }
+ sa += len;
+ offset -= len;
+ }
+
+ return VM_FAULT_SIGBUS;
+}
+
+static const struct vm_operations_struct sg_mmap_vm_ops = {
+ .fault = sg_vma_fault,
+};
+
+static int
+sg_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ Sg_fd *sfp;
+ unsigned long req_sz, len, sa;
+ Sg_scatter_hold *rsv_schp;
+ int k, length;
+ int ret = 0;
+
+ if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
+ return -ENXIO;
+ req_sz = vma->vm_end - vma->vm_start;
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_mmap starting, vm_start=%p, len=%d\n",
+ (void *) vma->vm_start, (int) req_sz));
+ if (vma->vm_pgoff)
+ return -EINVAL; /* want no offset */
+ rsv_schp = &sfp->reserve;
+ mutex_lock(&sfp->f_mutex);
+ if (req_sz > rsv_schp->bufflen) {
+ ret = -ENOMEM; /* cannot map more than reserved buffer */
+ goto out;
+ }
+
+ sa = vma->vm_start;
+ length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
+ len = vma->vm_end - sa;
+ len = (len < length) ? len : length;
+ sa += len;
+ }
+
+ sfp->mmap_called = 1;
+ vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_private_data = sfp;
+ vma->vm_ops = &sg_mmap_vm_ops;
+out:
+ mutex_unlock(&sfp->f_mutex);
+ return ret;
+}
+
+static void
+sg_rq_end_io_usercontext(struct work_struct *work)
+{
+ struct sg_request *srp = container_of(work, struct sg_request, ew.work);
+ struct sg_fd *sfp = srp->parentfp;
+
+ sg_finish_rem_req(srp);
+ sg_remove_request(sfp, srp);
+ kref_put(&sfp->f_ref, sg_remove_sfp);
+}
+
+/*
+ * This function is a "bottom half" handler that is called by the mid
+ * level when a command is completed (or has failed).
+ */
+static void
+sg_rq_end_io(struct request *rq, blk_status_t status)
+{
+ struct sg_request *srp = rq->end_io_data;
+ struct scsi_request *req = scsi_req(rq);
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ unsigned long iflags;
+ unsigned int ms;
+ char *sense;
+ int result, resid, done = 1;
+
+ if (WARN_ON(srp->done != 0))
+ return;
+
+ sfp = srp->parentfp;
+ if (WARN_ON(sfp == NULL))
+ return;
+
+ sdp = sfp->parentdp;
+ if (unlikely(atomic_read(&sdp->detaching)))
+ pr_info("%s: device detaching\n", __func__);
+
+ sense = req->sense;
+ result = req->result;
+ resid = req->resid_len;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
+ "sg_cmd_done: pack_id=%d, res=0x%x\n",
+ srp->header.pack_id, result));
+ srp->header.resid = resid;
+ ms = jiffies_to_msecs(jiffies);
+ srp->header.duration = (ms > srp->header.duration) ?
+ (ms - srp->header.duration) : 0;
+ if (0 != result) {
+ struct scsi_sense_hdr sshdr;
+
+ srp->header.status = 0xff & result;
+ srp->header.masked_status = status_byte(result);
+ srp->header.msg_status = msg_byte(result);
+ srp->header.host_status = host_byte(result);
+ srp->header.driver_status = driver_byte(result);
+ if ((sdp->sgdebug > 0) &&
+ ((CHECK_CONDITION == srp->header.masked_status) ||
+ (COMMAND_TERMINATED == srp->header.masked_status)))
+ __scsi_print_sense(sdp->device, __func__, sense,
+ SCSI_SENSE_BUFFERSIZE);
+
+ /* Following if statement is a patch supplied by Eric Youngdale */
+ if (driver_byte(result) != 0
+ && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
+ && !scsi_sense_is_deferred(&sshdr)
+ && sshdr.sense_key == UNIT_ATTENTION
+ && sdp->device->removable) {
+ /* Detected possible disc change. Set the bit - this */
+ /* may be used if there are filesystems using this device */
+ sdp->device->changed = 1;
+ }
+ }
+
+ if (req->sense_len)
+ memcpy(srp->sense_b, req->sense, SCSI_SENSE_BUFFERSIZE);
+
+ /* Rely on write phase to clean out srp status values, so no "else" */
+
+ /*
+ * Free the request as soon as it is complete so that its resources
+ * can be reused without waiting for userspace to read() the
+ * result. But keep the associated bio (if any) around until
+ * blk_rq_unmap_user() can be called from user context.
+ */
+ srp->rq = NULL;
+ scsi_req_free_cmd(scsi_req(rq));
+ __blk_put_request(rq->q, rq);
+
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ if (unlikely(srp->orphan)) {
+ if (sfp->keep_orphan)
+ srp->sg_io_owned = 0;
+ else
+ done = 0;
+ }
+ srp->done = done;
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+
+ if (likely(done)) {
+ /* Now wake up any sg_read() that is waiting for this
+ * packet.
+ */
+ wake_up_interruptible(&sfp->read_wait);
+ kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
+ kref_put(&sfp->f_ref, sg_remove_sfp);
+ } else {
+ INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
+ schedule_work(&srp->ew.work);
+ }
+}
+
+static const struct file_operations sg_fops = {
+ .owner = THIS_MODULE,
+ .read = sg_read,
+ .write = sg_write,
+ .poll = sg_poll,
+ .unlocked_ioctl = sg_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = sg_compat_ioctl,
+#endif
+ .open = sg_open,
+ .mmap = sg_mmap,
+ .release = sg_release,
+ .fasync = sg_fasync,
+ .llseek = no_llseek,
+};
+
+static struct class *sg_sysfs_class;
+
+static int sg_sysfs_valid = 0;
+
+static Sg_device *
+sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
+{
+ struct request_queue *q = scsidp->request_queue;
+ Sg_device *sdp;
+ unsigned long iflags;
+ int error;
+ u32 k;
+
+ sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
+ if (!sdp) {
+ sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
+ "failure\n", __func__);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ idr_preload(GFP_KERNEL);
+ write_lock_irqsave(&sg_index_lock, iflags);
+
+ error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
+ if (error < 0) {
+ if (error == -ENOSPC) {
+ sdev_printk(KERN_WARNING, scsidp,
+ "Unable to attach sg device type=%d, minor number exceeds %d\n",
+ scsidp->type, SG_MAX_DEVS - 1);
+ error = -ENODEV;
+ } else {
+ sdev_printk(KERN_WARNING, scsidp, "%s: idr "
+ "allocation Sg_device failure: %d\n",
+ __func__, error);
+ }
+ goto out_unlock;
+ }
+ k = error;
+
+ SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
+ "sg_alloc: dev=%d \n", k));
+ sprintf(disk->disk_name, "sg%d", k);
+ disk->first_minor = k;
+ sdp->disk = disk;
+ sdp->device = scsidp;
+ mutex_init(&sdp->open_rel_lock);
+ INIT_LIST_HEAD(&sdp->sfds);
+ init_waitqueue_head(&sdp->open_wait);
+ atomic_set(&sdp->detaching, 0);
+ rwlock_init(&sdp->sfd_lock);
+ sdp->sg_tablesize = queue_max_segments(q);
+ sdp->index = k;
+ kref_init(&sdp->d_ref);
+ error = 0;
+
+out_unlock:
+ write_unlock_irqrestore(&sg_index_lock, iflags);
+ idr_preload_end();
+
+ if (error) {
+ kfree(sdp);
+ return ERR_PTR(error);
+ }
+ return sdp;
+}
+
+static int
+sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
+{
+ struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
+ struct gendisk *disk;
+ Sg_device *sdp = NULL;
+ struct cdev * cdev = NULL;
+ int error;
+ unsigned long iflags;
+
+ disk = alloc_disk(1);
+ if (!disk) {
+ pr_warn("%s: alloc_disk failed\n", __func__);
+ return -ENOMEM;
+ }
+ disk->major = SCSI_GENERIC_MAJOR;
+
+ error = -ENOMEM;
+ cdev = cdev_alloc();
+ if (!cdev) {
+ pr_warn("%s: cdev_alloc failed\n", __func__);
+ goto out;
+ }
+ cdev->owner = THIS_MODULE;
+ cdev->ops = &sg_fops;
+
+ sdp = sg_alloc(disk, scsidp);
+ if (IS_ERR(sdp)) {
+ pr_warn("%s: sg_alloc failed\n", __func__);
+ error = PTR_ERR(sdp);
+ goto out;
+ }
+
+ error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
+ if (error)
+ goto cdev_add_err;
+
+ sdp->cdev = cdev;
+ if (sg_sysfs_valid) {
+ struct device *sg_class_member;
+
+ sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
+ MKDEV(SCSI_GENERIC_MAJOR,
+ sdp->index),
+ sdp, "%s", disk->disk_name);
+ if (IS_ERR(sg_class_member)) {
+ pr_err("%s: device_create failed\n", __func__);
+ error = PTR_ERR(sg_class_member);
+ goto cdev_add_err;
+ }
+ error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
+ &sg_class_member->kobj, "generic");
+ if (error)
+ pr_err("%s: unable to make symlink 'generic' back "
+ "to sg%d\n", __func__, sdp->index);
+ } else
+ pr_warn("%s: sg_sys Invalid\n", __func__);
+
+ sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
+ "type %d\n", sdp->index, scsidp->type);
+
+ dev_set_drvdata(cl_dev, sdp);
+
+ return 0;
+
+cdev_add_err:
+ write_lock_irqsave(&sg_index_lock, iflags);
+ idr_remove(&sg_index_idr, sdp->index);
+ write_unlock_irqrestore(&sg_index_lock, iflags);
+ kfree(sdp);
+
+out:
+ put_disk(disk);
+ if (cdev)
+ cdev_del(cdev);
+ return error;
+}
+
+static void
+sg_device_destroy(struct kref *kref)
+{
+ struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
+ unsigned long flags;
+
+ /* CAUTION! Note that the device can still be found via idr_find()
+ * even though the refcount is 0. Therefore, do idr_remove() BEFORE
+ * any other cleanup.
+ */
+
+ write_lock_irqsave(&sg_index_lock, flags);
+ idr_remove(&sg_index_idr, sdp->index);
+ write_unlock_irqrestore(&sg_index_lock, flags);
+
+ SCSI_LOG_TIMEOUT(3,
+ sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
+
+ put_disk(sdp->disk);
+ kfree(sdp);
+}
+
+static void
+sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
+{
+ struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
+ Sg_device *sdp = dev_get_drvdata(cl_dev);
+ unsigned long iflags;
+ Sg_fd *sfp;
+ int val;
+
+ if (!sdp)
+ return;
+ /* want sdp->detaching non-zero as soon as possible */
+ val = atomic_inc_return(&sdp->detaching);
+ if (val > 1)
+ return; /* only want to do following once per device */
+
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "%s\n", __func__));
+
+ read_lock_irqsave(&sdp->sfd_lock, iflags);
+ list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
+ wake_up_interruptible_all(&sfp->read_wait);
+ kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
+ }
+ wake_up_interruptible_all(&sdp->open_wait);
+ read_unlock_irqrestore(&sdp->sfd_lock, iflags);
+
+ sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
+ device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
+ cdev_del(sdp->cdev);
+ sdp->cdev = NULL;
+
+ kref_put(&sdp->d_ref, sg_device_destroy);
+}
+
+module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
+module_param_named(def_reserved_size, def_reserved_size, int,
+ S_IRUGO | S_IWUSR);
+module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
+
+MODULE_AUTHOR("Douglas Gilbert");
+MODULE_DESCRIPTION("SCSI generic (sg) driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(SG_VERSION_STR);
+MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
+
+MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
+ "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
+MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
+MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
+
+static int __init
+init_sg(void)
+{
+ int rc;
+
+ if (scatter_elem_sz < PAGE_SIZE) {
+ scatter_elem_sz = PAGE_SIZE;
+ scatter_elem_sz_prev = scatter_elem_sz;
+ }
+ if (def_reserved_size >= 0)
+ sg_big_buff = def_reserved_size;
+ else
+ def_reserved_size = sg_big_buff;
+
+ rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
+ SG_MAX_DEVS, "sg");
+ if (rc)
+ return rc;
+ sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
+ if ( IS_ERR(sg_sysfs_class) ) {
+ rc = PTR_ERR(sg_sysfs_class);
+ goto err_out;
+ }
+ sg_sysfs_valid = 1;
+ rc = scsi_register_interface(&sg_interface);
+ if (0 == rc) {
+#ifdef CONFIG_SCSI_PROC_FS
+ sg_proc_init();
+#endif /* CONFIG_SCSI_PROC_FS */
+ return 0;
+ }
+ class_destroy(sg_sysfs_class);
+err_out:
+ unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
+ return rc;
+}
+
+static void __exit
+exit_sg(void)
+{
+#ifdef CONFIG_SCSI_PROC_FS
+ remove_proc_subtree("scsi/sg", NULL);
+#endif /* CONFIG_SCSI_PROC_FS */
+ scsi_unregister_interface(&sg_interface);
+ class_destroy(sg_sysfs_class);
+ sg_sysfs_valid = 0;
+ unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
+ SG_MAX_DEVS);
+ idr_destroy(&sg_index_idr);
+}
+
+static int
+sg_start_req(Sg_request *srp, unsigned char *cmd)
+{
+ int res;
+ struct request *rq;
+ struct scsi_request *req;
+ Sg_fd *sfp = srp->parentfp;
+ sg_io_hdr_t *hp = &srp->header;
+ int dxfer_len = (int) hp->dxfer_len;
+ int dxfer_dir = hp->dxfer_direction;
+ unsigned int iov_count = hp->iovec_count;
+ Sg_scatter_hold *req_schp = &srp->data;
+ Sg_scatter_hold *rsv_schp = &sfp->reserve;
+ struct request_queue *q = sfp->parentdp->device->request_queue;
+ struct rq_map_data *md, map_data;
+ int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
+ unsigned char *long_cmdp = NULL;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_start_req: dxfer_len=%d\n",
+ dxfer_len));
+
+ if (hp->cmd_len > BLK_MAX_CDB) {
+ long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
+ if (!long_cmdp)
+ return -ENOMEM;
+ }
+
+ /*
+ * NOTE
+ *
+ * With scsi-mq enabled, there are a fixed number of preallocated
+ * requests equal in number to shost->can_queue. If all of the
+ * preallocated requests are already in use, then blk_get_request()
+ * will sleep until an active command completes, freeing up a request.
+ * Although waiting in an asynchronous interface is less than ideal, we
+ * do not want to use BLK_MQ_REQ_NOWAIT here because userspace might
+ * not expect an EWOULDBLOCK from this condition.
+ */
+ rq = blk_get_request(q, hp->dxfer_direction == SG_DXFER_TO_DEV ?
+ REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
+ if (IS_ERR(rq)) {
+ kfree(long_cmdp);
+ return PTR_ERR(rq);
+ }
+ req = scsi_req(rq);
+
+ if (hp->cmd_len > BLK_MAX_CDB)
+ req->cmd = long_cmdp;
+ memcpy(req->cmd, cmd, hp->cmd_len);
+ req->cmd_len = hp->cmd_len;
+
+ srp->rq = rq;
+ rq->end_io_data = srp;
+ req->retries = SG_DEFAULT_RETRIES;
+
+ if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
+ return 0;
+
+ if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
+ dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
+ !sfp->parentdp->device->host->unchecked_isa_dma &&
+ blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
+ md = NULL;
+ else
+ md = &map_data;
+
+ if (md) {
+ mutex_lock(&sfp->f_mutex);
+ if (dxfer_len <= rsv_schp->bufflen &&
+ !sfp->res_in_use) {
+ sfp->res_in_use = 1;
+ sg_link_reserve(sfp, srp, dxfer_len);
+ } else if (hp->flags & SG_FLAG_MMAP_IO) {
+ res = -EBUSY; /* sfp->res_in_use == 1 */
+ if (dxfer_len > rsv_schp->bufflen)
+ res = -ENOMEM;
+ mutex_unlock(&sfp->f_mutex);
+ return res;
+ } else {
+ res = sg_build_indirect(req_schp, sfp, dxfer_len);
+ if (res) {
+ mutex_unlock(&sfp->f_mutex);
+ return res;
+ }
+ }
+ mutex_unlock(&sfp->f_mutex);
+
+ md->pages = req_schp->pages;
+ md->page_order = req_schp->page_order;
+ md->nr_entries = req_schp->k_use_sg;
+ md->offset = 0;
+ md->null_mapped = hp->dxferp ? 0 : 1;
+ if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
+ md->from_user = 1;
+ else
+ md->from_user = 0;
+ }
+
+ if (iov_count) {
+ struct iovec *iov = NULL;
+ struct iov_iter i;
+
+ res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
+ if (res < 0)
+ return res;
+
+ iov_iter_truncate(&i, hp->dxfer_len);
+ if (!iov_iter_count(&i)) {
+ kfree(iov);
+ return -EINVAL;
+ }
+
+ res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
+ kfree(iov);
+ } else
+ res = blk_rq_map_user(q, rq, md, hp->dxferp,
+ hp->dxfer_len, GFP_ATOMIC);
+
+ if (!res) {
+ srp->bio = rq->bio;
+
+ if (!md) {
+ req_schp->dio_in_use = 1;
+ hp->info |= SG_INFO_DIRECT_IO;
+ }
+ }
+ return res;
+}
+
+static int
+sg_finish_rem_req(Sg_request *srp)
+{
+ int ret = 0;
+
+ Sg_fd *sfp = srp->parentfp;
+ Sg_scatter_hold *req_schp = &srp->data;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_finish_rem_req: res_used=%d\n",
+ (int) srp->res_used));
+ if (srp->bio)
+ ret = blk_rq_unmap_user(srp->bio);
+
+ if (srp->rq) {
+ scsi_req_free_cmd(scsi_req(srp->rq));
+ blk_put_request(srp->rq);
+ }
+
+ if (srp->res_used)
+ sg_unlink_reserve(sfp, srp);
+ else
+ sg_remove_scat(sfp, req_schp);
+
+ return ret;
+}
+
+static int
+sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
+{
+ int sg_bufflen = tablesize * sizeof(struct page *);
+ gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
+
+ schp->pages = kzalloc(sg_bufflen, gfp_flags);
+ if (!schp->pages)
+ return -ENOMEM;
+ schp->sglist_len = sg_bufflen;
+ return tablesize; /* number of scat_gath elements allocated */
+}
+
+static int
+sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
+{
+ int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
+ int sg_tablesize = sfp->parentdp->sg_tablesize;
+ int blk_size = buff_size, order;
+ gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN | __GFP_ZERO;
+ struct sg_device *sdp = sfp->parentdp;
+
+ if (blk_size < 0)
+ return -EFAULT;
+ if (0 == blk_size)
+ ++blk_size; /* don't know why */
+ /* round request up to next highest SG_SECTOR_SZ byte boundary */
+ blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_build_indirect: buff_size=%d, blk_size=%d\n",
+ buff_size, blk_size));
+
+ /* N.B. ret_sz carried into this block ... */
+ mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
+ if (mx_sc_elems < 0)
+ return mx_sc_elems; /* most likely -ENOMEM */
+
+ num = scatter_elem_sz;
+ if (unlikely(num != scatter_elem_sz_prev)) {
+ if (num < PAGE_SIZE) {
+ scatter_elem_sz = PAGE_SIZE;
+ scatter_elem_sz_prev = PAGE_SIZE;
+ } else
+ scatter_elem_sz_prev = num;
+ }
+
+ if (sdp->device->host->unchecked_isa_dma)
+ gfp_mask |= GFP_DMA;
+
+ order = get_order(num);
+retry:
+ ret_sz = 1 << (PAGE_SHIFT + order);
+
+ for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
+ k++, rem_sz -= ret_sz) {
+
+ num = (rem_sz > scatter_elem_sz_prev) ?
+ scatter_elem_sz_prev : rem_sz;
+
+ schp->pages[k] = alloc_pages(gfp_mask, order);
+ if (!schp->pages[k])
+ goto out;
+
+ if (num == scatter_elem_sz_prev) {
+ if (unlikely(ret_sz > scatter_elem_sz_prev)) {
+ scatter_elem_sz = ret_sz;
+ scatter_elem_sz_prev = ret_sz;
+ }
+ }
+
+ SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
+ k, num, ret_sz));
+ } /* end of for loop */
+
+ schp->page_order = order;
+ schp->k_use_sg = k;
+ SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
+ k, rem_sz));
+
+ schp->bufflen = blk_size;
+ if (rem_sz > 0) /* must have failed */
+ return -ENOMEM;
+ return 0;
+out:
+ for (i = 0; i < k; i++)
+ __free_pages(schp->pages[i], order);
+
+ if (--order >= 0)
+ goto retry;
+
+ return -ENOMEM;
+}
+
+static void
+sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
+{
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
+ if (schp->pages && schp->sglist_len > 0) {
+ if (!schp->dio_in_use) {
+ int k;
+
+ for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
+ SCSI_LOG_TIMEOUT(5,
+ sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_remove_scat: k=%d, pg=0x%p\n",
+ k, schp->pages[k]));
+ __free_pages(schp->pages[k], schp->page_order);
+ }
+
+ kfree(schp->pages);
+ }
+ }
+ memset(schp, 0, sizeof (*schp));
+}
+
+static int
+sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
+{
+ Sg_scatter_hold *schp = &srp->data;
+ int k, num;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
+ "sg_read_oxfer: num_read_xfer=%d\n",
+ num_read_xfer));
+ if ((!outp) || (num_read_xfer <= 0))
+ return 0;
+
+ num = 1 << (PAGE_SHIFT + schp->page_order);
+ for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
+ if (num > num_read_xfer) {
+ if (__copy_to_user(outp, page_address(schp->pages[k]),
+ num_read_xfer))
+ return -EFAULT;
+ break;
+ } else {
+ if (__copy_to_user(outp, page_address(schp->pages[k]),
+ num))
+ return -EFAULT;
+ num_read_xfer -= num;
+ if (num_read_xfer <= 0)
+ break;
+ outp += num;
+ }
+ }
+
+ return 0;
+}
+
+static void
+sg_build_reserve(Sg_fd * sfp, int req_size)
+{
+ Sg_scatter_hold *schp = &sfp->reserve;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_build_reserve: req_size=%d\n", req_size));
+ do {
+ if (req_size < PAGE_SIZE)
+ req_size = PAGE_SIZE;
+ if (0 == sg_build_indirect(schp, sfp, req_size))
+ return;
+ else
+ sg_remove_scat(sfp, schp);
+ req_size >>= 1; /* divide by 2 */
+ } while (req_size > (PAGE_SIZE / 2));
+}
+
+static void
+sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
+{
+ Sg_scatter_hold *req_schp = &srp->data;
+ Sg_scatter_hold *rsv_schp = &sfp->reserve;
+ int k, num, rem;
+
+ srp->res_used = 1;
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_link_reserve: size=%d\n", size));
+ rem = size;
+
+ num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg; k++) {
+ if (rem <= num) {
+ req_schp->k_use_sg = k + 1;
+ req_schp->sglist_len = rsv_schp->sglist_len;
+ req_schp->pages = rsv_schp->pages;
+
+ req_schp->bufflen = size;
+ req_schp->page_order = rsv_schp->page_order;
+ break;
+ } else
+ rem -= num;
+ }
+
+ if (k >= rsv_schp->k_use_sg)
+ SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+ "sg_link_reserve: BAD size\n"));
+}
+
+static void
+sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
+{
+ Sg_scatter_hold *req_schp = &srp->data;
+
+ SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
+ "sg_unlink_reserve: req->k_use_sg=%d\n",
+ (int) req_schp->k_use_sg));
+ req_schp->k_use_sg = 0;
+ req_schp->bufflen = 0;
+ req_schp->pages = NULL;
+ req_schp->page_order = 0;
+ req_schp->sglist_len = 0;
+ srp->res_used = 0;
+ /* Called without mutex lock to avoid deadlock */
+ sfp->res_in_use = 0;
+}
+
+static Sg_request *
+sg_get_rq_mark(Sg_fd * sfp, int pack_id)
+{
+ Sg_request *resp;
+ unsigned long iflags;
+
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ list_for_each_entry(resp, &sfp->rq_list, entry) {
+ /* look for requests that are ready + not SG_IO owned */
+ if ((1 == resp->done) && (!resp->sg_io_owned) &&
+ ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
+ resp->done = 2; /* guard against other readers */
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return resp;
+ }
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return NULL;
+}
+
+/* always adds to end of list */
+static Sg_request *
+sg_add_request(Sg_fd * sfp)
+{
+ int k;
+ unsigned long iflags;
+ Sg_request *rp = sfp->req_arr;
+
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ if (!list_empty(&sfp->rq_list)) {
+ if (!sfp->cmd_q)
+ goto out_unlock;
+
+ for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
+ if (!rp->parentfp)
+ break;
+ }
+ if (k >= SG_MAX_QUEUE)
+ goto out_unlock;
+ }
+ memset(rp, 0, sizeof (Sg_request));
+ rp->parentfp = sfp;
+ rp->header.duration = jiffies_to_msecs(jiffies);
+ list_add_tail(&rp->entry, &sfp->rq_list);
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return rp;
+out_unlock:
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return NULL;
+}
+
+/* Return of 1 for found; 0 for not found */
+static int
+sg_remove_request(Sg_fd * sfp, Sg_request * srp)
+{
+ unsigned long iflags;
+ int res = 0;
+
+ if (!sfp || !srp || list_empty(&sfp->rq_list))
+ return res;
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ if (!list_empty(&srp->entry)) {
+ list_del(&srp->entry);
+ srp->parentfp = NULL;
+ res = 1;
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return res;
+}
+
+static Sg_fd *
+sg_add_sfp(Sg_device * sdp)
+{
+ Sg_fd *sfp;
+ unsigned long iflags;
+ int bufflen;
+
+ sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
+ if (!sfp)
+ return ERR_PTR(-ENOMEM);
+
+ init_waitqueue_head(&sfp->read_wait);
+ rwlock_init(&sfp->rq_list_lock);
+ INIT_LIST_HEAD(&sfp->rq_list);
+ kref_init(&sfp->f_ref);
+ mutex_init(&sfp->f_mutex);
+ sfp->timeout = SG_DEFAULT_TIMEOUT;
+ sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
+ sfp->force_packid = SG_DEF_FORCE_PACK_ID;
+ sfp->cmd_q = SG_DEF_COMMAND_Q;
+ sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
+ sfp->parentdp = sdp;
+ write_lock_irqsave(&sdp->sfd_lock, iflags);
+ if (atomic_read(&sdp->detaching)) {
+ write_unlock_irqrestore(&sdp->sfd_lock, iflags);
+ kfree(sfp);
+ return ERR_PTR(-ENODEV);
+ }
+ list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
+ write_unlock_irqrestore(&sdp->sfd_lock, iflags);
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_add_sfp: sfp=0x%p\n", sfp));
+ if (unlikely(sg_big_buff != def_reserved_size))
+ sg_big_buff = def_reserved_size;
+
+ bufflen = min_t(int, sg_big_buff,
+ max_sectors_bytes(sdp->device->request_queue));
+ sg_build_reserve(sfp, bufflen);
+ SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+ "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
+ sfp->reserve.bufflen,
+ sfp->reserve.k_use_sg));
+
+ kref_get(&sdp->d_ref);
+ __module_get(THIS_MODULE);
+ return sfp;
+}
+
+static void
+sg_remove_sfp_usercontext(struct work_struct *work)
+{
+ struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
+ struct sg_device *sdp = sfp->parentdp;
+ Sg_request *srp;
+ unsigned long iflags;
+
+ /* Cleanup any responses which were never read(). */
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ while (!list_empty(&sfp->rq_list)) {
+ srp = list_first_entry(&sfp->rq_list, Sg_request, entry);
+ sg_finish_rem_req(srp);
+ list_del(&srp->entry);
+ srp->parentfp = NULL;
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+
+ if (sfp->reserve.bufflen > 0) {
+ SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
+ "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
+ (int) sfp->reserve.bufflen,
+ (int) sfp->reserve.k_use_sg));
+ sg_remove_scat(sfp, &sfp->reserve);
+ }
+
+ SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
+ "sg_remove_sfp: sfp=0x%p\n", sfp));
+ kfree(sfp);
+
+ scsi_device_put(sdp->device);
+ kref_put(&sdp->d_ref, sg_device_destroy);
+ module_put(THIS_MODULE);
+}
+
+static void
+sg_remove_sfp(struct kref *kref)
+{
+ struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
+ struct sg_device *sdp = sfp->parentdp;
+ unsigned long iflags;
+
+ write_lock_irqsave(&sdp->sfd_lock, iflags);
+ list_del(&sfp->sfd_siblings);
+ write_unlock_irqrestore(&sdp->sfd_lock, iflags);
+
+ INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
+ schedule_work(&sfp->ew.work);
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+static int
+sg_idr_max_id(int id, void *p, void *data)
+{
+ int *k = data;
+
+ if (*k < id)
+ *k = id;
+
+ return 0;
+}
+
+static int
+sg_last_dev(void)
+{
+ int k = -1;
+ unsigned long iflags;
+
+ read_lock_irqsave(&sg_index_lock, iflags);
+ idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
+ read_unlock_irqrestore(&sg_index_lock, iflags);
+ return k + 1; /* origin 1 */
+}
+#endif
+
+/* must be called with sg_index_lock held */
+static Sg_device *sg_lookup_dev(int dev)
+{
+ return idr_find(&sg_index_idr, dev);
+}
+
+static Sg_device *
+sg_get_dev(int dev)
+{
+ struct sg_device *sdp;
+ unsigned long flags;
+
+ read_lock_irqsave(&sg_index_lock, flags);
+ sdp = sg_lookup_dev(dev);
+ if (!sdp)
+ sdp = ERR_PTR(-ENXIO);
+ else if (atomic_read(&sdp->detaching)) {
+ /* If sdp->detaching, then the refcount may already be 0, in
+ * which case it would be a bug to do kref_get().
+ */
+ sdp = ERR_PTR(-ENODEV);
+ } else
+ kref_get(&sdp->d_ref);
+ read_unlock_irqrestore(&sg_index_lock, flags);
+
+ return sdp;
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+static int sg_proc_seq_show_int(struct seq_file *s, void *v);
+
+static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
+static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
+ size_t count, loff_t *off);
+static const struct file_operations adio_fops = {
+ .owner = THIS_MODULE,
+ .open = sg_proc_single_open_adio,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = sg_proc_write_adio,
+ .release = single_release,
+};
+
+static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
+static ssize_t sg_proc_write_dressz(struct file *filp,
+ const char __user *buffer, size_t count, loff_t *off);
+static const struct file_operations dressz_fops = {
+ .owner = THIS_MODULE,
+ .open = sg_proc_single_open_dressz,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = sg_proc_write_dressz,
+ .release = single_release,
+};
+
+static int sg_proc_seq_show_version(struct seq_file *s, void *v);
+static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
+static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
+static void * dev_seq_start(struct seq_file *s, loff_t *pos);
+static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
+static void dev_seq_stop(struct seq_file *s, void *v);
+static const struct seq_operations dev_seq_ops = {
+ .start = dev_seq_start,
+ .next = dev_seq_next,
+ .stop = dev_seq_stop,
+ .show = sg_proc_seq_show_dev,
+};
+
+static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
+static const struct seq_operations devstrs_seq_ops = {
+ .start = dev_seq_start,
+ .next = dev_seq_next,
+ .stop = dev_seq_stop,
+ .show = sg_proc_seq_show_devstrs,
+};
+
+static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
+static const struct seq_operations debug_seq_ops = {
+ .start = dev_seq_start,
+ .next = dev_seq_next,
+ .stop = dev_seq_stop,
+ .show = sg_proc_seq_show_debug,
+};
+
+static int
+sg_proc_init(void)
+{
+ struct proc_dir_entry *p;
+
+ p = proc_mkdir("scsi/sg", NULL);
+ if (!p)
+ return 1;
+
+ proc_create("allow_dio", S_IRUGO | S_IWUSR, p, &adio_fops);
+ proc_create_seq("debug", S_IRUGO, p, &debug_seq_ops);
+ proc_create("def_reserved_size", S_IRUGO | S_IWUSR, p, &dressz_fops);
+ proc_create_single("device_hdr", S_IRUGO, p, sg_proc_seq_show_devhdr);
+ proc_create_seq("devices", S_IRUGO, p, &dev_seq_ops);
+ proc_create_seq("device_strs", S_IRUGO, p, &devstrs_seq_ops);
+ proc_create_single("version", S_IRUGO, p, sg_proc_seq_show_version);
+ return 0;
+}
+
+
+static int sg_proc_seq_show_int(struct seq_file *s, void *v)
+{
+ seq_printf(s, "%d\n", *((int *)s->private));
+ return 0;
+}
+
+static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
+{
+ return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
+}
+
+static ssize_t
+sg_proc_write_adio(struct file *filp, const char __user *buffer,
+ size_t count, loff_t *off)
+{
+ int err;
+ unsigned long num;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ err = kstrtoul_from_user(buffer, count, 0, &num);
+ if (err)
+ return err;
+ sg_allow_dio = num ? 1 : 0;
+ return count;
+}
+
+static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
+{
+ return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
+}
+
+static ssize_t
+sg_proc_write_dressz(struct file *filp, const char __user *buffer,
+ size_t count, loff_t *off)
+{
+ int err;
+ unsigned long k = ULONG_MAX;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+
+ err = kstrtoul_from_user(buffer, count, 0, &k);
+ if (err)
+ return err;
+ if (k <= 1048576) { /* limit "big buff" to 1 MB */
+ sg_big_buff = k;
+ return count;
+ }
+ return -ERANGE;
+}
+
+static int sg_proc_seq_show_version(struct seq_file *s, void *v)
+{
+ seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
+ sg_version_date);
+ return 0;
+}
+
+static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
+{
+ seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
+ return 0;
+}
+
+struct sg_proc_deviter {
+ loff_t index;
+ size_t max;
+};
+
+static void * dev_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
+
+ s->private = it;
+ if (! it)
+ return NULL;
+
+ it->index = *pos;
+ it->max = sg_last_dev();
+ if (it->index >= it->max)
+ return NULL;
+ return it;
+}
+
+static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct sg_proc_deviter * it = s->private;
+
+ *pos = ++it->index;
+ return (it->index < it->max) ? it : NULL;
+}
+
+static void dev_seq_stop(struct seq_file *s, void *v)
+{
+ kfree(s->private);
+}
+
+static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
+{
+ struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
+ Sg_device *sdp;
+ struct scsi_device *scsidp;
+ unsigned long iflags;
+
+ read_lock_irqsave(&sg_index_lock, iflags);
+ sdp = it ? sg_lookup_dev(it->index) : NULL;
+ if ((NULL == sdp) || (NULL == sdp->device) ||
+ (atomic_read(&sdp->detaching)))
+ seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
+ else {
+ scsidp = sdp->device;
+ seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
+ scsidp->host->host_no, scsidp->channel,
+ scsidp->id, scsidp->lun, (int) scsidp->type,
+ 1,
+ (int) scsidp->queue_depth,
+ (int) atomic_read(&scsidp->device_busy),
+ (int) scsi_device_online(scsidp));
+ }
+ read_unlock_irqrestore(&sg_index_lock, iflags);
+ return 0;
+}
+
+static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
+{
+ struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
+ Sg_device *sdp;
+ struct scsi_device *scsidp;
+ unsigned long iflags;
+
+ read_lock_irqsave(&sg_index_lock, iflags);
+ sdp = it ? sg_lookup_dev(it->index) : NULL;
+ scsidp = sdp ? sdp->device : NULL;
+ if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
+ seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
+ scsidp->vendor, scsidp->model, scsidp->rev);
+ else
+ seq_puts(s, "<no active device>\n");
+ read_unlock_irqrestore(&sg_index_lock, iflags);
+ return 0;
+}
+
+/* must be called while holding sg_index_lock */
+static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
+{
+ int k, new_interface, blen, usg;
+ Sg_request *srp;
+ Sg_fd *fp;
+ const sg_io_hdr_t *hp;
+ const char * cp;
+ unsigned int ms;
+
+ k = 0;
+ list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
+ k++;
+ read_lock(&fp->rq_list_lock); /* irqs already disabled */
+ seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
+ "(res)sgat=%d low_dma=%d\n", k,
+ jiffies_to_msecs(fp->timeout),
+ fp->reserve.bufflen,
+ (int) fp->reserve.k_use_sg,
+ (int) sdp->device->host->unchecked_isa_dma);
+ seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
+ (int) fp->cmd_q, (int) fp->force_packid,
+ (int) fp->keep_orphan);
+ list_for_each_entry(srp, &fp->rq_list, entry) {
+ hp = &srp->header;
+ new_interface = (hp->interface_id == '\0') ? 0 : 1;
+ if (srp->res_used) {
+ if (new_interface &&
+ (SG_FLAG_MMAP_IO & hp->flags))
+ cp = " mmap>> ";
+ else
+ cp = " rb>> ";
+ } else {
+ if (SG_INFO_DIRECT_IO_MASK & hp->info)
+ cp = " dio>> ";
+ else
+ cp = " ";
+ }
+ seq_puts(s, cp);
+ blen = srp->data.bufflen;
+ usg = srp->data.k_use_sg;
+ seq_puts(s, srp->done ?
+ ((1 == srp->done) ? "rcv:" : "fin:")
+ : "act:");
+ seq_printf(s, " id=%d blen=%d",
+ srp->header.pack_id, blen);
+ if (srp->done)
+ seq_printf(s, " dur=%d", hp->duration);
+ else {
+ ms = jiffies_to_msecs(jiffies);
+ seq_printf(s, " t_o/elap=%d/%d",
+ (new_interface ? hp->timeout :
+ jiffies_to_msecs(fp->timeout)),
+ (ms > hp->duration ? ms - hp->duration : 0));
+ }
+ seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
+ (int) srp->data.cmd_opcode);
+ }
+ if (list_empty(&fp->rq_list))
+ seq_puts(s, " No requests active\n");
+ read_unlock(&fp->rq_list_lock);
+ }
+}
+
+static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
+{
+ struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
+ Sg_device *sdp;
+ unsigned long iflags;
+
+ if (it && (0 == it->index))
+ seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
+ (int)it->max, sg_big_buff);
+
+ read_lock_irqsave(&sg_index_lock, iflags);
+ sdp = it ? sg_lookup_dev(it->index) : NULL;
+ if (NULL == sdp)
+ goto skip;
+ read_lock(&sdp->sfd_lock);
+ if (!list_empty(&sdp->sfds)) {
+ seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
+ if (atomic_read(&sdp->detaching))
+ seq_puts(s, "detaching pending close ");
+ else if (sdp->device) {
+ struct scsi_device *scsidp = sdp->device;
+
+ seq_printf(s, "%d:%d:%d:%llu em=%d",
+ scsidp->host->host_no,
+ scsidp->channel, scsidp->id,
+ scsidp->lun,
+ scsidp->host->hostt->emulated);
+ }
+ seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
+ sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
+ sg_proc_debug_helper(s, sdp);
+ }
+ read_unlock(&sdp->sfd_lock);
+skip:
+ read_unlock_irqrestore(&sg_index_lock, iflags);
+ return 0;
+}
+
+#endif /* CONFIG_SCSI_PROC_FS */
+
+module_init(init_sg);
+module_exit(exit_sg);