Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
new file mode 100644
index 0000000..fd72d73
--- /dev/null
+++ b/drivers/scsi/sg.c
@@ -0,0 +1,3092 @@
+/*
+ * 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 - 2005 Douglas Gilbert
+ *
+ * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
+ *
+ * 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 = 30532; /* 2 digits for each component */
+#define SG_VERSION_STR "3.5.32"
+
+/*
+ * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), 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/config.h>
+#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/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/smp_lock.h>
+#include <linux/moduleparam.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/cdev.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+
+#include "scsi.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 = "20050117";
+
+static int sg_proc_init(void);
+static void sg_proc_cleanup(void);
+#endif
+
+#ifndef LINUX_VERSION_CODE
+#include <linux/version.h>
+#endif /* LINUX_VERSION_CODE */
+
+#define SG_ALLOW_DIO_DEF 0
+#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
+
+#define SG_MAX_DEVS 32768
+
+/*
+ * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
+ * Then when using 32 bit integers x * m may overflow during the calculation.
+ * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
+ * calculates the same, but prevents the overflow when both m and d
+ * are "small" numbers (like HZ and USER_HZ).
+ * Of course an overflow is inavoidable if the result of muldiv doesn't fit
+ * in 32 bits.
+ */
+#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
+
+#define SG_DEFAULT_TIMEOUT MULDIV(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;
+
+#define SG_SECTOR_SZ 512
+#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
+
+#define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
+
+static int sg_add(struct class_device *);
+static void sg_remove(struct class_device *);
+
+static Scsi_Request *dummy_cmdp; /* only used for sizeof */
+
+static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
+ file descriptor list for device */
+
+static struct class_interface sg_interface = {
+ .add = sg_add,
+ .remove = sg_remove,
+};
+
+typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
+ unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
+ unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
+ unsigned bufflen; /* Size of (aggregate) data buffer */
+ unsigned b_malloc_len; /* actual len malloc'ed in buffer */
+ void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
+ 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 */
+ Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
+ struct sg_request *nextrp; /* NULL -> tail request (slist) */
+ 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[sizeof (dummy_cmdp->sr_sense_buffer)];
+ 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 */
+ volatile char done; /* 0->before bh, 1->before read, 2->read */
+} Sg_request;
+
+typedef struct sg_fd { /* holds the state of a file descriptor */
+ struct sg_fd *nextfp; /* NULL when last opened fd on this device */
+ 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 */
+ 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 */
+ unsigned save_scat_len; /* original length of trunc. scat. element */
+ Sg_request *headrp; /* head of request slist, NULL->empty */
+ struct fasync_struct *async_qp; /* used by asynchronous notification */
+ Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
+ char low_dma; /* as in parent but possibly overridden to 1 */
+ char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
+ volatile char closed; /* 1 -> fd closed but request(s) outstanding */
+ char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
+ char next_cmd_len; /* 0 -> automatic (def), >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 */
+} Sg_fd;
+
+typedef struct sg_device { /* holds the state of each scsi generic device */
+ struct scsi_device *device;
+ wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
+ int sg_tablesize; /* adapter's max scatter-gather table size */
+ Sg_fd *headfp; /* first open fd belonging to this device */
+ volatile char detached; /* 0->attached, 1->detached pending removal */
+ volatile char exclude; /* opened for exclusive access */
+ 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>] */
+} Sg_device;
+
+static int sg_fasync(int fd, struct file *filp, int mode);
+static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
+static int sg_start_req(Sg_request * srp);
+static void sg_finish_rem_req(Sg_request * srp);
+static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
+static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
+ int tablesize);
+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, const char __user *buf, size_t count,
+ int blocking, int read_only, 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_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
+ int wr_xf, int *countp, unsigned char __user **up);
+static int sg_write_xfer(Sg_request * srp);
+static int sg_read_xfer(Sg_request * srp);
+static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
+static void sg_remove_scat(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 char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
+static void sg_page_free(char *buff, int size);
+static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
+static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
+static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
+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 int sg_res_in_use(Sg_fd * sfp);
+static int sg_allow_access(unsigned char opcode, char dev_type);
+static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
+static Sg_device *sg_get_dev(int dev);
+static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
+#ifdef CONFIG_SCSI_PROC_FS
+static int sg_last_dev(void);
+#endif
+
+static Sg_device **sg_dev_arr = NULL;
+static int sg_dev_max;
+static int sg_nr_dev;
+
+#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)
+
+static int
+sg_open(struct inode *inode, struct file *filp)
+{
+ int dev = iminor(inode);
+ int flags = filp->f_flags;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ int res;
+ int retval;
+
+ nonseekable_open(inode, filp);
+ SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
+ sdp = sg_get_dev(dev);
+ if ((!sdp) || (!sdp->device))
+ return -ENXIO;
+ if (sdp->detached)
+ return -ENODEV;
+
+ /* 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)
+ return retval;
+
+ if (!((flags & O_NONBLOCK) ||
+ scsi_block_when_processing_errors(sdp->device))) {
+ retval = -ENXIO;
+ /* we are in error recovery for this device */
+ goto error_out;
+ }
+
+ if (flags & O_EXCL) {
+ if (O_RDONLY == (flags & O_ACCMODE)) {
+ retval = -EPERM; /* Can't lock it with read only access */
+ goto error_out;
+ }
+ if (sdp->headfp && (flags & O_NONBLOCK)) {
+ retval = -EBUSY;
+ goto error_out;
+ }
+ res = 0;
+ __wait_event_interruptible(sdp->o_excl_wait,
+ ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
+ if (res) {
+ retval = res; /* -ERESTARTSYS because signal hit process */
+ goto error_out;
+ }
+ } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
+ if (flags & O_NONBLOCK) {
+ retval = -EBUSY;
+ goto error_out;
+ }
+ res = 0;
+ __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
+ res);
+ if (res) {
+ retval = res; /* -ERESTARTSYS because signal hit process */
+ goto error_out;
+ }
+ }
+ if (sdp->detached) {
+ retval = -ENODEV;
+ goto error_out;
+ }
+ if (!sdp->headfp) { /* no existing opens on this device */
+ sdp->sgdebug = 0;
+ sdp->sg_tablesize = sdp->device->host->sg_tablesize;
+ }
+ if ((sfp = sg_add_sfp(sdp, dev)))
+ filp->private_data = sfp;
+ else {
+ if (flags & O_EXCL)
+ sdp->exclude = 0; /* undo if error */
+ retval = -ENOMEM;
+ goto error_out;
+ }
+ return 0;
+
+ error_out:
+ scsi_device_put(sdp->device);
+ return retval;
+}
+
+/* Following function was formerly called 'sg_close' */
+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, printk("sg_release: %s\n", sdp->disk->disk_name));
+ sg_fasync(-1, filp, 0); /* remove filp from async notification list */
+ if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
+ if (!sdp->detached) {
+ scsi_device_put(sdp->device);
+ }
+ sdp->exclude = 0;
+ wake_up_interruptible(&sdp->o_excl_wait);
+ }
+ return 0;
+}
+
+static ssize_t
+sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
+{
+ int res;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ int req_pack_id = -1;
+ struct sg_header old_hdr;
+ sg_io_hdr_t new_hdr;
+ sg_io_hdr_t *hp;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
+ sdp->disk->disk_name, (int) count));
+ if (!access_ok(VERIFY_WRITE, buf, count))
+ return -EFAULT;
+ if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
+ if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
+ return -EFAULT;
+ if (old_hdr.reply_len < 0) {
+ if (count >= SZ_SG_IO_HDR) {
+ if (__copy_from_user
+ (&new_hdr, buf, SZ_SG_IO_HDR))
+ return -EFAULT;
+ req_pack_id = new_hdr.pack_id;
+ }
+ } 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 (sdp->detached)
+ return -ENODEV;
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ while (1) {
+ res = 0; /* following is a macro that beats race condition */
+ __wait_event_interruptible(sfp->read_wait,
+ (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
+ res);
+ if (sdp->detached)
+ return -ENODEV;
+ if (0 == res)
+ break;
+ return res; /* -ERESTARTSYS because signal hit process */
+ }
+ }
+ if (srp->header.interface_id != '\0')
+ return sg_new_read(sfp, buf, count, srp);
+
+ hp = &srp->header;
+ memset(&old_hdr, 0, SZ_SG_HEADER);
+ old_hdr.reply_len = (int) hp->timeout;
+ old_hdr.pack_len = old_hdr.reply_len; /* very 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))
+ return -EFAULT;
+ buf += SZ_SG_HEADER;
+ if (count > old_hdr.reply_len)
+ count = old_hdr.reply_len;
+ if (count > SZ_SG_HEADER) {
+ if ((res =
+ sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
+ return -EFAULT;
+ }
+ } else
+ count = (old_hdr.result == 0) ? 0 : -EIO;
+ sg_finish_rem_req(srp);
+ return count;
+}
+
+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;
+ 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 = sizeof (dummy_cmdp->sr_sense_buffer);
+ 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 = sg_read_xfer(srp);
+ err_out:
+ sg_finish_rem_req(srp);
+ return (0 == err) ? count : err;
+}
+
+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[sizeof (dummy_cmdp->sr_cmnd)];
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
+ sdp->disk->disk_name, (int) count));
+ if (sdp->detached)
+ 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, buf, count, blocking, 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, printk("sg_write: queue full\n"));
+ return -EDOM;
+ }
+ buf += SZ_SG_HEADER;
+ __get_user(opcode, buf);
+ if (sfp->next_cmd_len > 0) {
+ if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
+ SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
+ sfp->next_cmd_len = 0;
+ sg_remove_request(sfp, srp);
+ return -EIO;
+ }
+ 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;
+ }
+ SCSI_LOG_TIMEOUT(4, printk(
+ "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;
+ hp->dxferp = (char __user *)buf + cmd_size;
+ 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)
+ if (printk_ratelimit())
+ printk(KERN_WARNING
+ "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
+ "guessing data in;\n" KERN_WARNING " "
+ "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, const char __user *buf, size_t count,
+ int blocking, int read_only, Sg_request ** o_srp)
+{
+ int k;
+ Sg_request *srp;
+ sg_io_hdr_t *hp;
+ unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
+ 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, printk("sg_new_write: queue full\n"));
+ return -EDOM;
+ }
+ 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 (sg_res_in_use(sfp)) {
+ 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(cmnd[0], sfp->parentdp->device->type))) {
+ 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;
+ Scsi_Request *SRpnt;
+ Sg_device *sdp = sfp->parentdp;
+ sg_io_hdr_t *hp = &srp->header;
+ request_queue_t *q;
+
+ 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, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
+ (int) cmnd[0], (int) hp->cmd_len));
+
+ if ((k = sg_start_req(srp))) {
+ SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
+ sg_finish_rem_req(srp);
+ return k; /* probably out of space --> ENOMEM */
+ }
+ if ((k = sg_write_xfer(srp))) {
+ SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
+ sg_finish_rem_req(srp);
+ return k;
+ }
+ if (sdp->detached) {
+ sg_finish_rem_req(srp);
+ return -ENODEV;
+ }
+ SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
+ if (SRpnt == NULL) {
+ SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
+ sg_finish_rem_req(srp);
+ return -ENOMEM;
+ }
+
+ srp->my_cmdp = SRpnt;
+ q = SRpnt->sr_device->request_queue;
+ SRpnt->sr_request->rq_disk = sdp->disk;
+ SRpnt->sr_sense_buffer[0] = 0;
+ SRpnt->sr_cmd_len = hp->cmd_len;
+ SRpnt->sr_use_sg = srp->data.k_use_sg;
+ SRpnt->sr_sglist_len = srp->data.sglist_len;
+ SRpnt->sr_bufflen = srp->data.bufflen;
+ SRpnt->sr_underflow = 0;
+ SRpnt->sr_buffer = srp->data.buffer;
+ switch (hp->dxfer_direction) {
+ case SG_DXFER_TO_FROM_DEV:
+ case SG_DXFER_FROM_DEV:
+ SRpnt->sr_data_direction = SCSI_DATA_READ;
+ break;
+ case SG_DXFER_TO_DEV:
+ SRpnt->sr_data_direction = SCSI_DATA_WRITE;
+ break;
+ case SG_DXFER_UNKNOWN:
+ SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
+ break;
+ default:
+ SRpnt->sr_data_direction = SCSI_DATA_NONE;
+ break;
+ }
+ SRpnt->upper_private_data = srp;
+ srp->data.k_use_sg = 0;
+ srp->data.sglist_len = 0;
+ srp->data.bufflen = 0;
+ srp->data.buffer = NULL;
+ hp->duration = jiffies; /* unit jiffies now, millisecs after done */
+/* Now send everything of to mid-level. The next time we hear about this
+ packet is when sg_cmd_done() is called (i.e. a callback). */
+ scsi_do_req(SRpnt, (void *) cmnd,
+ (void *) SRpnt->sr_buffer, hp->dxfer_len,
+ sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
+ /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
+ return 0;
+}
+
+static int
+sg_srp_done(Sg_request *srp, Sg_fd *sfp)
+{
+ unsigned long iflags;
+ int done;
+
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ done = srp->done;
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return done;
+}
+
+static int
+sg_ioctl(struct inode *inode, 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, printk("sg_ioctl: %s, cmd=0x%x\n",
+ sdp->disk->disk_name, (int) cmd_in));
+ read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
+
+ switch (cmd_in) {
+ case SG_IO:
+ {
+ int blocking = 1; /* ignore O_NONBLOCK flag */
+
+ if (sdp->detached)
+ 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, p, SZ_SG_IO_HDR,
+ blocking, read_only, &srp);
+ if (result < 0)
+ return result;
+ srp->sg_io_owned = 1;
+ while (1) {
+ result = 0; /* following macro to beat race condition */
+ __wait_event_interruptible(sfp->read_wait,
+ (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
+ result);
+ if (sdp->detached)
+ return -ENODEV;
+ if (sfp->closed)
+ return 0; /* request packet dropped already */
+ if (0 == result)
+ break;
+ srp->orphan = 1;
+ return result; /* -ERESTARTSYS because signal hit process */
+ }
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ srp->done = 2;
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
+ return (result < 0) ? result : 0;
+ }
+ case SG_SET_TIMEOUT:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (val < 0)
+ return -EIO;
+ if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
+ val = MULDIV (INT_MAX, USER_HZ, HZ);
+ sfp->timeout_user = val;
+ sfp->timeout = MULDIV (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:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (val) {
+ sfp->low_dma = 1;
+ if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
+ val = (int) sfp->reserve.bufflen;
+ sg_remove_scat(&sfp->reserve);
+ sg_build_reserve(sfp, val);
+ }
+ } else {
+ if (sdp->detached)
+ return -ENODEV;
+ sfp->low_dma = sdp->device->host->unchecked_isa_dma;
+ }
+ return 0;
+ case SG_GET_LOW_DMA:
+ return put_user((int) sfp->low_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 (sdp->detached)
+ 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);
+ for (srp = sfp->headrp; srp; srp = srp->nextrp) {
+ 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);
+ for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
+ 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;
+ if (val != sfp->reserve.bufflen) {
+ if (sg_res_in_use(sfp) || sfp->mmap_called)
+ return -EBUSY;
+ sg_remove_scat(&sfp->reserve);
+ sg_build_reserve(sfp, val);
+ }
+ return 0;
+ case SG_GET_RESERVED_SIZE:
+ val = (int) sfp->reserve.bufflen;
+ 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;
+ 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[SG_MAX_QUEUE];
+ Sg_request *srp;
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
+ ++val, srp = srp ? srp->nextrp : srp) {
+ memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
+ if (srp) {
+ rinfo[val].req_state = srp->done + 1;
+ rinfo[val].problem =
+ srp->header.masked_status &
+ srp->header.host_status &
+ srp->header.driver_status;
+ rinfo[val].duration =
+ srp->done ? srp->header.duration :
+ jiffies_to_msecs(
+ jiffies - srp->header.duration);
+ 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;
+ }
+ }
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return (__copy_to_user(p, rinfo,
+ SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
+ }
+ case SG_EMULATED_HOST:
+ if (sdp->detached)
+ return -ENODEV;
+ return put_user(sdp->device->host->hostt->emulated, ip);
+ case SG_SCSI_RESET:
+ if (sdp->detached)
+ return -ENODEV;
+ if (filp->f_flags & O_NONBLOCK) {
+ if (test_bit(SHOST_RECOVERY,
+ &sdp->device->host->shost_state))
+ return -EBUSY;
+ } else if (!scsi_block_when_processing_errors(sdp->device))
+ return -EBUSY;
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ if (SG_SCSI_RESET_NOTHING == val)
+ return 0;
+ switch (val) {
+ case SG_SCSI_RESET_DEVICE:
+ val = SCSI_TRY_RESET_DEVICE;
+ break;
+ case SG_SCSI_RESET_BUS:
+ val = SCSI_TRY_RESET_BUS;
+ break;
+ case SG_SCSI_RESET_HOST:
+ val = SCSI_TRY_RESET_HOST;
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ return (scsi_reset_provider(sdp->device, val) ==
+ SUCCESS) ? 0 : -EIO;
+ case SCSI_IOCTL_SEND_COMMAND:
+ if (sdp->detached)
+ return -ENODEV;
+ if (read_only) {
+ unsigned char opcode = WRITE_6;
+ Scsi_Ioctl_Command __user *siocp = p;
+
+ if (copy_from_user(&opcode, siocp->data, 1))
+ return -EFAULT;
+ if (!sg_allow_access(opcode, sdp->device->type))
+ return -EPERM;
+ }
+ return scsi_ioctl_send_command(sdp->device, p);
+ case SG_SET_DEBUG:
+ result = get_user(val, ip);
+ if (result)
+ return result;
+ sdp->sgdebug = (char) val;
+ return 0;
+ case SCSI_IOCTL_GET_IDLUN:
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ case SCSI_IOCTL_PROBE_HOST:
+ case SG_GET_TRANSFORM:
+ if (sdp->detached)
+ return -ENODEV;
+ return scsi_ioctl(sdp->device, cmd_in, p);
+ default:
+ if (read_only)
+ return -EPERM; /* don't know so take safe approach */
+ 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 unsigned int
+sg_poll(struct file *filp, poll_table * wait)
+{
+ unsigned int res = 0;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+ Sg_request *srp;
+ int count = 0;
+ unsigned long iflags;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
+ || sfp->closed)
+ return POLLERR;
+ poll_wait(filp, &sfp->read_wait, wait);
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ for (srp = sfp->headrp; srp; srp = srp->nextrp) {
+ /* if any read waiting, flag it */
+ if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
+ res = POLLIN | POLLRDNORM;
+ ++count;
+ }
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+
+ if (sdp->detached)
+ res |= POLLHUP;
+ else if (!sfp->cmd_q) {
+ if (0 == count)
+ res |= POLLOUT | POLLWRNORM;
+ } else if (count < SG_MAX_QUEUE)
+ res |= POLLOUT | POLLWRNORM;
+ SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
+ sdp->disk->disk_name, (int) res));
+ return res;
+}
+
+static int
+sg_fasync(int fd, struct file *filp, int mode)
+{
+ int retval;
+ Sg_device *sdp;
+ Sg_fd *sfp;
+
+ if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
+ sdp->disk->disk_name, mode));
+
+ retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
+ return (retval < 0) ? retval : 0;
+}
+
+static inline unsigned char *
+sg_scatg2virt(const struct scatterlist *sclp)
+{
+ return (sclp && sclp->page) ?
+ (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
+}
+
+/* When startFinish==1 increments page counts for pages other than the
+ first of scatter gather elements obtained from __get_free_pages().
+ When startFinish==0 decrements ... */
+static void
+sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
+{
+ void *page_ptr;
+ struct page *page;
+ int k, m;
+
+ SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
+ startFinish, rsv_schp->k_use_sg));
+ /* N.B. correction _not_ applied to base page of each allocation */
+ if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
+ struct scatterlist *sclp = rsv_schp->buffer;
+
+ for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
+ for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
+ page_ptr = sg_scatg2virt(sclp) + m;
+ page = virt_to_page(page_ptr);
+ if (startFinish)
+ get_page(page);
+ else {
+ if (page_count(page) > 0)
+ __put_page(page);
+ }
+ }
+ }
+ } else { /* reserve buffer is just a single allocation */
+ for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
+ page_ptr = (unsigned char *) rsv_schp->buffer + m;
+ page = virt_to_page(page_ptr);
+ if (startFinish)
+ get_page(page);
+ else {
+ if (page_count(page) > 0)
+ __put_page(page);
+ }
+ }
+ }
+}
+
+static struct page *
+sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
+{
+ Sg_fd *sfp;
+ struct page *page = NOPAGE_SIGBUS;
+ void *page_ptr = NULL;
+ unsigned long offset;
+ Sg_scatter_hold *rsv_schp;
+
+ if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
+ return page;
+ rsv_schp = &sfp->reserve;
+ offset = addr - vma->vm_start;
+ if (offset >= rsv_schp->bufflen)
+ return page;
+ SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
+ offset, rsv_schp->k_use_sg));
+ if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
+ int k;
+ unsigned long sa = vma->vm_start;
+ unsigned long len;
+ struct scatterlist *sclp = rsv_schp->buffer;
+
+ for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
+ ++k, ++sclp) {
+ len = vma->vm_end - sa;
+ len = (len < sclp->length) ? len : sclp->length;
+ if (offset < len) {
+ page_ptr = sg_scatg2virt(sclp) + offset;
+ page = virt_to_page(page_ptr);
+ get_page(page); /* increment page count */
+ break;
+ }
+ sa += len;
+ offset -= len;
+ }
+ } else { /* reserve buffer is just a single allocation */
+ page_ptr = (unsigned char *) rsv_schp->buffer + offset;
+ page = virt_to_page(page_ptr);
+ get_page(page); /* increment page count */
+ }
+ if (type)
+ *type = VM_FAULT_MINOR;
+ return page;
+}
+
+static struct vm_operations_struct sg_mmap_vm_ops = {
+ .nopage = sg_vma_nopage,
+};
+
+static int
+sg_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ Sg_fd *sfp;
+ unsigned long req_sz = vma->vm_end - vma->vm_start;
+ Sg_scatter_hold *rsv_schp;
+
+ if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
+ return -ENXIO;
+ SCSI_LOG_TIMEOUT(3, printk("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;
+ if (req_sz > rsv_schp->bufflen)
+ return -ENOMEM; /* cannot map more than reserved buffer */
+
+ if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
+ int k;
+ unsigned long sa = vma->vm_start;
+ unsigned long len;
+ struct scatterlist *sclp = rsv_schp->buffer;
+
+ for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
+ ++k, ++sclp) {
+ if (0 != sclp->offset)
+ return -EFAULT; /* non page aligned memory ?? */
+ len = vma->vm_end - sa;
+ len = (len < sclp->length) ? len : sclp->length;
+ sa += len;
+ }
+ } else { /* reserve buffer is just a single allocation */
+ if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
+ return -EFAULT; /* non page aligned memory ?? */
+ }
+ if (0 == sfp->mmap_called) {
+ sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
+ sfp->mmap_called = 1;
+ }
+ vma->vm_flags |= (VM_RESERVED | VM_IO);
+ vma->vm_private_data = sfp;
+ vma->vm_ops = &sg_mmap_vm_ops;
+ return 0;
+}
+
+/* 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_cmd_done(Scsi_Cmnd * SCpnt)
+{
+ Scsi_Request *SRpnt = NULL;
+ Sg_device *sdp = NULL;
+ Sg_fd *sfp;
+ Sg_request *srp = NULL;
+ unsigned long iflags;
+
+ if (SCpnt && (SRpnt = SCpnt->sc_request))
+ srp = (Sg_request *) SRpnt->upper_private_data;
+ if (NULL == srp) {
+ printk(KERN_ERR "sg_cmd_done: NULL request\n");
+ if (SRpnt)
+ scsi_release_request(SRpnt);
+ return;
+ }
+ sfp = srp->parentfp;
+ if (sfp)
+ sdp = sfp->parentdp;
+ if ((NULL == sdp) || sdp->detached) {
+ printk(KERN_INFO "sg_cmd_done: device detached\n");
+ scsi_release_request(SRpnt);
+ return;
+ }
+
+ /* First transfer ownership of data buffers to sg_device object. */
+ srp->data.k_use_sg = SRpnt->sr_use_sg;
+ srp->data.sglist_len = SRpnt->sr_sglist_len;
+ srp->data.bufflen = SRpnt->sr_bufflen;
+ srp->data.buffer = SRpnt->sr_buffer;
+ /* now clear out request structure */
+ SRpnt->sr_use_sg = 0;
+ SRpnt->sr_sglist_len = 0;
+ SRpnt->sr_bufflen = 0;
+ SRpnt->sr_buffer = NULL;
+ SRpnt->sr_underflow = 0;
+ SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
+
+ srp->my_cmdp = NULL;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
+ sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
+ srp->header.resid = SCpnt->resid;
+ /* N.B. unit of duration changes here from jiffies to millisecs */
+ srp->header.duration =
+ jiffies_to_msecs(jiffies - srp->header.duration);
+ if (0 != SRpnt->sr_result) {
+ struct scsi_sense_hdr sshdr;
+
+ memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
+ sizeof (srp->sense_b));
+ srp->header.status = 0xff & SRpnt->sr_result;
+ srp->header.masked_status = status_byte(SRpnt->sr_result);
+ srp->header.msg_status = msg_byte(SRpnt->sr_result);
+ srp->header.host_status = host_byte(SRpnt->sr_result);
+ srp->header.driver_status = driver_byte(SRpnt->sr_result);
+ if ((sdp->sgdebug > 0) &&
+ ((CHECK_CONDITION == srp->header.masked_status) ||
+ (COMMAND_TERMINATED == srp->header.masked_status)))
+ print_req_sense("sg_cmd_done", SRpnt);
+
+ /* Following if statement is a patch supplied by Eric Youngdale */
+ if (driver_byte(SRpnt->sr_result) != 0
+ && scsi_command_normalize_sense(SCpnt, &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;
+ }
+ }
+ /* Rely on write phase to clean out srp status values, so no "else" */
+
+ scsi_release_request(SRpnt);
+ SRpnt = NULL;
+ if (sfp->closed) { /* whoops this fd already released, cleanup */
+ SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
+ sg_finish_rem_req(srp);
+ srp = NULL;
+ if (NULL == sfp->headrp) {
+ SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
+ if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
+ scsi_device_put(sdp->device);
+ }
+ sfp = NULL;
+ }
+ } else if (srp && srp->orphan) {
+ if (sfp->keep_orphan)
+ srp->sg_io_owned = 0;
+ else {
+ sg_finish_rem_req(srp);
+ srp = NULL;
+ }
+ }
+ if (sfp && srp) {
+ /* Now wake up any sg_read() that is waiting for this packet. */
+ kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ srp->done = 1;
+ wake_up_interruptible(&sfp->read_wait);
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ }
+}
+
+static struct file_operations sg_fops = {
+ .owner = THIS_MODULE,
+ .read = sg_read,
+ .write = sg_write,
+ .poll = sg_poll,
+ .ioctl = sg_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = sg_compat_ioctl,
+#endif
+ .open = sg_open,
+ .mmap = sg_mmap,
+ .release = sg_release,
+ .fasync = sg_fasync,
+};
+
+static struct class_simple * sg_sysfs_class;
+
+static int sg_sysfs_valid = 0;
+
+static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
+{
+ Sg_device *sdp;
+ unsigned long iflags;
+ void *old_sg_dev_arr = NULL;
+ int k, error;
+
+ sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
+ if (!sdp) {
+ printk(KERN_WARNING "kmalloc Sg_device failure\n");
+ return -ENOMEM;
+ }
+
+ write_lock_irqsave(&sg_dev_arr_lock, iflags);
+ if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
+ Sg_device **tmp_da;
+ int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+
+ tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
+ if (unlikely(!tmp_da))
+ goto expand_failed;
+
+ write_lock_irqsave(&sg_dev_arr_lock, iflags);
+ memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
+ memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
+ old_sg_dev_arr = sg_dev_arr;
+ sg_dev_arr = tmp_da;
+ sg_dev_max = tmp_dev_max;
+ }
+
+ for (k = 0; k < sg_dev_max; k++)
+ if (!sg_dev_arr[k])
+ break;
+ if (unlikely(k >= SG_MAX_DEVS))
+ goto overflow;
+
+ memset(sdp, 0, sizeof(*sdp));
+ SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
+ sprintf(disk->disk_name, "sg%d", k);
+ disk->first_minor = k;
+ sdp->disk = disk;
+ sdp->device = scsidp;
+ init_waitqueue_head(&sdp->o_excl_wait);
+ sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
+
+ sg_nr_dev++;
+ sg_dev_arr[k] = sdp;
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ error = k;
+
+ out:
+ if (error < 0)
+ kfree(sdp);
+ kfree(old_sg_dev_arr);
+ return error;
+
+ expand_failed:
+ printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
+ error = -ENOMEM;
+ goto out;
+
+ overflow:
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ printk(KERN_WARNING
+ "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
+ "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
+ scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
+ error = -ENODEV;
+ goto out;
+}
+
+static int
+sg_add(struct class_device *cl_dev)
+{
+ struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
+ struct gendisk *disk;
+ Sg_device *sdp = NULL;
+ struct cdev * cdev = NULL;
+ int error, k;
+
+ disk = alloc_disk(1);
+ if (!disk) {
+ printk(KERN_WARNING "alloc_disk failed\n");
+ return -ENOMEM;
+ }
+ disk->major = SCSI_GENERIC_MAJOR;
+
+ error = -ENOMEM;
+ cdev = cdev_alloc();
+ if (!cdev) {
+ printk(KERN_WARNING "cdev_alloc failed\n");
+ goto out;
+ }
+ cdev->owner = THIS_MODULE;
+ cdev->ops = &sg_fops;
+
+ error = sg_alloc(disk, scsidp);
+ if (error < 0) {
+ printk(KERN_WARNING "sg_alloc failed\n");
+ goto out;
+ }
+ k = error;
+ sdp = sg_dev_arr[k];
+
+ devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
+ S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
+ "%s/generic", scsidp->devfs_name);
+ error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
+ if (error) {
+ devfs_remove("%s/generic", scsidp->devfs_name);
+ goto out;
+ }
+ sdp->cdev = cdev;
+ if (sg_sysfs_valid) {
+ struct class_device * sg_class_member;
+
+ sg_class_member = class_simple_device_add(sg_sysfs_class,
+ MKDEV(SCSI_GENERIC_MAJOR, k),
+ cl_dev->dev, "%s",
+ disk->disk_name);
+ if (IS_ERR(sg_class_member))
+ printk(KERN_WARNING "sg_add: "
+ "class_simple_device_add failed\n");
+ class_set_devdata(sg_class_member, sdp);
+ error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
+ &sg_class_member->kobj, "generic");
+ if (error)
+ printk(KERN_ERR "sg_add: unable to make symlink "
+ "'generic' back to sg%d\n", k);
+ } else
+ printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
+
+ printk(KERN_NOTICE
+ "Attached scsi generic sg%d at scsi%d, channel"
+ " %d, id %d, lun %d, type %d\n", k,
+ scsidp->host->host_no, scsidp->channel, scsidp->id,
+ scsidp->lun, scsidp->type);
+
+ return 0;
+
+out:
+ put_disk(disk);
+ if (cdev)
+ cdev_del(cdev);
+ return error;
+}
+
+static void
+sg_remove(struct class_device *cl_dev)
+{
+ struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
+ Sg_device *sdp = NULL;
+ unsigned long iflags;
+ Sg_fd *sfp;
+ Sg_fd *tsfp;
+ Sg_request *srp;
+ Sg_request *tsrp;
+ int k, delay;
+
+ if (NULL == sg_dev_arr)
+ return;
+ delay = 0;
+ write_lock_irqsave(&sg_dev_arr_lock, iflags);
+ for (k = 0; k < sg_dev_max; k++) {
+ sdp = sg_dev_arr[k];
+ if ((NULL == sdp) || (sdp->device != scsidp))
+ continue; /* dirty but lowers nesting */
+ if (sdp->headfp) {
+ sdp->detached = 1;
+ for (sfp = sdp->headfp; sfp; sfp = tsfp) {
+ tsfp = sfp->nextfp;
+ for (srp = sfp->headrp; srp; srp = tsrp) {
+ tsrp = srp->nextrp;
+ if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
+ sg_finish_rem_req(srp);
+ }
+ if (sfp->closed) {
+ scsi_device_put(sdp->device);
+ __sg_remove_sfp(sdp, sfp);
+ } else {
+ delay = 1;
+ wake_up_interruptible(&sfp->read_wait);
+ kill_fasync(&sfp->async_qp, SIGPOLL,
+ POLL_HUP);
+ }
+ }
+ SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
+ if (NULL == sdp->headfp) {
+ sg_dev_arr[k] = NULL;
+ }
+ } else { /* nothing active, simple case */
+ SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
+ sg_dev_arr[k] = NULL;
+ }
+ sg_nr_dev--;
+ break;
+ }
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+
+ if (sdp) {
+ sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
+ class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
+ cdev_del(sdp->cdev);
+ sdp->cdev = NULL;
+ devfs_remove("%s/generic", scsidp->devfs_name);
+ put_disk(sdp->disk);
+ sdp->disk = NULL;
+ if (NULL == sdp->headfp)
+ kfree((char *) sdp);
+ }
+
+ if (delay)
+ msleep(10); /* dirty detach so delay device destruction */
+}
+
+/* Set 'perm' (4th argument) to 0 to disable module_param's definition
+ * of sysfs parameters (which module_param doesn't yet support).
+ * Sysfs parameters defined explicitly below.
+ */
+module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
+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_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 (def_reserved_size >= 0)
+ sg_big_buff = def_reserved_size;
+
+ rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
+ SG_MAX_DEVS, "sg");
+ if (rc)
+ return rc;
+ sg_sysfs_class = class_simple_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_simple_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
+ sg_proc_cleanup();
+#endif /* CONFIG_SCSI_PROC_FS */
+ scsi_unregister_interface(&sg_interface);
+ class_simple_destroy(sg_sysfs_class);
+ sg_sysfs_valid = 0;
+ unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
+ SG_MAX_DEVS);
+ if (sg_dev_arr != NULL) {
+ kfree((char *) sg_dev_arr);
+ sg_dev_arr = NULL;
+ }
+ sg_dev_max = 0;
+}
+
+static int
+sg_start_req(Sg_request * srp)
+{
+ int res;
+ 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;
+ Sg_scatter_hold *req_schp = &srp->data;
+ Sg_scatter_hold *rsv_schp = &sfp->reserve;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
+ 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) && (0 == hp->iovec_count) &&
+ (!sfp->parentdp->device->host->unchecked_isa_dma)) {
+ res = sg_build_direct(srp, sfp, dxfer_len);
+ if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
+ return res;
+ }
+ if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
+ sg_link_reserve(sfp, srp, dxfer_len);
+ else {
+ res = sg_build_indirect(req_schp, sfp, dxfer_len);
+ if (res) {
+ sg_remove_scat(req_schp);
+ return res;
+ }
+ }
+ return 0;
+}
+
+static void
+sg_finish_rem_req(Sg_request * srp)
+{
+ Sg_fd *sfp = srp->parentfp;
+ Sg_scatter_hold *req_schp = &srp->data;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
+ if (srp->res_used)
+ sg_unlink_reserve(sfp, srp);
+ else
+ sg_remove_scat(req_schp);
+ sg_remove_request(sfp, srp);
+}
+
+static int
+sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
+{
+ int ret_sz;
+ int elem_sz = sizeof (struct scatterlist);
+ int sg_bufflen = tablesize * elem_sz;
+ int mx_sc_elems = tablesize;
+
+ schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
+ if (!schp->buffer)
+ return -ENOMEM;
+ else if (ret_sz != sg_bufflen) {
+ sg_bufflen = ret_sz;
+ mx_sc_elems = sg_bufflen / elem_sz;
+ }
+ schp->sglist_len = sg_bufflen;
+ memset(schp->buffer, 0, sg_bufflen);
+ return mx_sc_elems; /* number of scat_gath elements allocated */
+}
+
+#ifdef SG_ALLOW_DIO_CODE
+/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
+ /* hopefully this generic code will moved to a library */
+
+/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
+ - mapping of all pages not successful
+ - any page is above max_pfn
+ (i.e., either completely successful or fails)
+*/
+static int
+st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
+ unsigned long uaddr, size_t count, int rw,
+ unsigned long max_pfn)
+{
+ int res, i, j;
+ unsigned int nr_pages;
+ struct page **pages;
+
+ nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
+
+ /* User attempted Overflow! */
+ if ((uaddr + count) < uaddr)
+ return -EINVAL;
+
+ /* Too big */
+ if (nr_pages > max_pages)
+ return -ENOMEM;
+
+ /* Hmm? */
+ if (count == 0)
+ return 0;
+
+ if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
+ return -ENOMEM;
+
+ /* Try to fault in all of the necessary pages */
+ down_read(¤t->mm->mmap_sem);
+ /* rw==READ means read from drive, write into memory area */
+ res = get_user_pages(
+ current,
+ current->mm,
+ uaddr,
+ nr_pages,
+ rw == READ,
+ 0, /* don't force */
+ pages,
+ NULL);
+ up_read(¤t->mm->mmap_sem);
+
+ /* Errors and no page mapped should return here */
+ if (res < nr_pages)
+ goto out_unmap;
+
+ for (i=0; i < nr_pages; i++) {
+ /* FIXME: flush superflous for rw==READ,
+ * probably wrong function for rw==WRITE
+ */
+ flush_dcache_page(pages[i]);
+ if (page_to_pfn(pages[i]) > max_pfn)
+ goto out_unlock;
+ /* ?? Is locking needed? I don't think so */
+ /* if (TestSetPageLocked(pages[i]))
+ goto out_unlock; */
+ }
+
+ /* Populate the scatter/gather list */
+ sgl[0].page = pages[0];
+ sgl[0].offset = uaddr & ~PAGE_MASK;
+ if (nr_pages > 1) {
+ sgl[0].length = PAGE_SIZE - sgl[0].offset;
+ count -= sgl[0].length;
+ for (i=1; i < nr_pages ; i++) {
+ sgl[i].offset = 0;
+ sgl[i].page = pages[i];
+ sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
+ count -= PAGE_SIZE;
+ }
+ }
+ else {
+ sgl[0].length = count;
+ }
+
+ kfree(pages);
+ return nr_pages;
+
+ out_unlock:
+ /* for (j=0; j < i; j++)
+ unlock_page(pages[j]); */
+ res = 0;
+ out_unmap:
+ if (res > 0)
+ for (j=0; j < res; j++)
+ page_cache_release(pages[j]);
+ kfree(pages);
+ return res;
+}
+
+
+/* And unmap them... */
+static int
+st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
+ int dirtied)
+{
+ int i;
+
+ for (i=0; i < nr_pages; i++) {
+ if (dirtied && !PageReserved(sgl[i].page))
+ SetPageDirty(sgl[i].page);
+ /* unlock_page(sgl[i].page); */
+ /* FIXME: cache flush missing for rw==READ
+ * FIXME: call the correct reference counting function
+ */
+ page_cache_release(sgl[i].page);
+ }
+
+ return 0;
+}
+
+/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
+#endif
+
+
+/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
+static int
+sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
+{
+#ifdef SG_ALLOW_DIO_CODE
+ sg_io_hdr_t *hp = &srp->header;
+ Sg_scatter_hold *schp = &srp->data;
+ int sg_tablesize = sfp->parentdp->sg_tablesize;
+ struct scatterlist *sgl;
+ int mx_sc_elems, res;
+ struct scsi_device *sdev = sfp->parentdp->device;
+
+ if (((unsigned long)hp->dxferp &
+ queue_dma_alignment(sdev->request_queue)) != 0)
+ return 1;
+ mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
+ if (mx_sc_elems <= 0) {
+ return 1;
+ }
+ sgl = (struct scatterlist *)schp->buffer;
+ res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
+ (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
+ if (res <= 0)
+ return 1;
+ schp->k_use_sg = res;
+ schp->dio_in_use = 1;
+ hp->info |= SG_INFO_DIRECT_IO;
+ return 0;
+#else
+ return 1;
+#endif
+}
+
+static int
+sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
+{
+ int ret_sz;
+ int blk_size = buff_size;
+ unsigned char *p = NULL;
+
+ if ((blk_size < 0) || (!sfp))
+ 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 = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
+ SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
+ buff_size, blk_size));
+ if (blk_size <= SG_SCATTER_SZ) {
+ p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
+ if (!p)
+ return -ENOMEM;
+ if (blk_size == ret_sz) { /* got it on the first attempt */
+ schp->k_use_sg = 0;
+ schp->buffer = p;
+ schp->bufflen = blk_size;
+ schp->b_malloc_len = blk_size;
+ return 0;
+ }
+ } else {
+ p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
+ if (!p)
+ return -ENOMEM;
+ }
+/* Want some local declarations, so start new block ... */
+ { /* lets try and build a scatter gather list */
+ struct scatterlist *sclp;
+ int k, rem_sz, num;
+ int mx_sc_elems;
+ int sg_tablesize = sfp->parentdp->sg_tablesize;
+ int first = 1;
+
+ /* 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 */
+
+ for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
+ (rem_sz > 0) && (k < mx_sc_elems);
+ ++k, rem_sz -= ret_sz, ++sclp) {
+ if (first)
+ first = 0;
+ else {
+ num =
+ (rem_sz >
+ SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
+ p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
+ if (!p)
+ break;
+ }
+ sclp->page = virt_to_page(p);
+ sclp->offset = offset_in_page(p);
+ sclp->length = ret_sz;
+
+ SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
+ k, sg_scatg2virt(sclp), ret_sz));
+ } /* end of for loop */
+ schp->k_use_sg = k;
+ SCSI_LOG_TIMEOUT(5, printk("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;
+}
+
+static int
+sg_write_xfer(Sg_request * srp)
+{
+ sg_io_hdr_t *hp = &srp->header;
+ Sg_scatter_hold *schp = &srp->data;
+ int num_xfer = 0;
+ int j, k, onum, usglen, ksglen, res;
+ int iovec_count = (int) hp->iovec_count;
+ int dxfer_dir = hp->dxfer_direction;
+ unsigned char *p;
+ unsigned char __user *up;
+ int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
+
+ if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
+ (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
+ num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
+ if (schp->bufflen < num_xfer)
+ num_xfer = schp->bufflen;
+ }
+ if ((num_xfer <= 0) || (schp->dio_in_use) ||
+ (new_interface
+ && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
+ return 0;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
+ num_xfer, iovec_count, schp->k_use_sg));
+ if (iovec_count) {
+ onum = iovec_count;
+ if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
+ return -EFAULT;
+ } else
+ onum = 1;
+
+ if (0 == schp->k_use_sg) { /* kernel has single buffer */
+ for (j = 0, p = schp->buffer; j < onum; ++j) {
+ res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
+ if (res)
+ return res;
+ usglen = (num_xfer > usglen) ? usglen : num_xfer;
+ if (__copy_from_user(p, up, usglen))
+ return -EFAULT;
+ p += usglen;
+ num_xfer -= usglen;
+ if (num_xfer <= 0)
+ return 0;
+ }
+ } else { /* kernel using scatter gather list */
+ struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
+
+ ksglen = (int) sclp->length;
+ p = sg_scatg2virt(sclp);
+ for (j = 0, k = 0; j < onum; ++j) {
+ res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
+ if (res)
+ return res;
+
+ for (; p; ++sclp, ksglen = (int) sclp->length,
+ p = sg_scatg2virt(sclp)) {
+ if (usglen <= 0)
+ break;
+ if (ksglen > usglen) {
+ if (usglen >= num_xfer) {
+ if (__copy_from_user
+ (p, up, num_xfer))
+ return -EFAULT;
+ return 0;
+ }
+ if (__copy_from_user(p, up, usglen))
+ return -EFAULT;
+ p += usglen;
+ ksglen -= usglen;
+ break;
+ } else {
+ if (ksglen >= num_xfer) {
+ if (__copy_from_user
+ (p, up, num_xfer))
+ return -EFAULT;
+ return 0;
+ }
+ if (__copy_from_user(p, up, ksglen))
+ return -EFAULT;
+ up += ksglen;
+ usglen -= ksglen;
+ }
+ ++k;
+ if (k >= schp->k_use_sg)
+ return 0;
+ }
+ }
+ }
+ return 0;
+}
+
+static int
+sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
+ int wr_xf, int *countp, unsigned char __user **up)
+{
+ int num_xfer = (int) hp->dxfer_len;
+ unsigned char __user *p = hp->dxferp;
+ int count;
+
+ if (0 == sg_num) {
+ if (wr_xf && ('\0' == hp->interface_id))
+ count = (int) hp->flags; /* holds "old" input_size */
+ else
+ count = num_xfer;
+ } else {
+ sg_iovec_t iovec;
+ if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
+ return -EFAULT;
+ p = iovec.iov_base;
+ count = (int) iovec.iov_len;
+ }
+ if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
+ return -EFAULT;
+ if (up)
+ *up = p;
+ if (countp)
+ *countp = count;
+ return 0;
+}
+
+static void
+sg_remove_scat(Sg_scatter_hold * schp)
+{
+ SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
+ if (schp->buffer && (schp->sglist_len > 0)) {
+ struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
+
+ if (schp->dio_in_use) {
+#ifdef SG_ALLOW_DIO_CODE
+ st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
+#endif
+ } else {
+ int k;
+
+ for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
+ ++k, ++sclp) {
+ SCSI_LOG_TIMEOUT(5, printk(
+ "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
+ k, sg_scatg2virt(sclp), sclp->length));
+ sg_page_free(sg_scatg2virt(sclp), sclp->length);
+ sclp->page = NULL;
+ sclp->offset = 0;
+ sclp->length = 0;
+ }
+ }
+ sg_page_free(schp->buffer, schp->sglist_len);
+ } else if (schp->buffer)
+ sg_page_free(schp->buffer, schp->b_malloc_len);
+ memset(schp, 0, sizeof (*schp));
+}
+
+static int
+sg_read_xfer(Sg_request * srp)
+{
+ sg_io_hdr_t *hp = &srp->header;
+ Sg_scatter_hold *schp = &srp->data;
+ int num_xfer = 0;
+ int j, k, onum, usglen, ksglen, res;
+ int iovec_count = (int) hp->iovec_count;
+ int dxfer_dir = hp->dxfer_direction;
+ unsigned char *p;
+ unsigned char __user *up;
+ int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
+
+ if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
+ || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
+ num_xfer = hp->dxfer_len;
+ if (schp->bufflen < num_xfer)
+ num_xfer = schp->bufflen;
+ }
+ if ((num_xfer <= 0) || (schp->dio_in_use) ||
+ (new_interface
+ && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
+ return 0;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
+ num_xfer, iovec_count, schp->k_use_sg));
+ if (iovec_count) {
+ onum = iovec_count;
+ if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
+ return -EFAULT;
+ } else
+ onum = 1;
+
+ if (0 == schp->k_use_sg) { /* kernel has single buffer */
+ for (j = 0, p = schp->buffer; j < onum; ++j) {
+ res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
+ if (res)
+ return res;
+ usglen = (num_xfer > usglen) ? usglen : num_xfer;
+ if (__copy_to_user(up, p, usglen))
+ return -EFAULT;
+ p += usglen;
+ num_xfer -= usglen;
+ if (num_xfer <= 0)
+ return 0;
+ }
+ } else { /* kernel using scatter gather list */
+ struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
+
+ ksglen = (int) sclp->length;
+ p = sg_scatg2virt(sclp);
+ for (j = 0, k = 0; j < onum; ++j) {
+ res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
+ if (res)
+ return res;
+
+ for (; p; ++sclp, ksglen = (int) sclp->length,
+ p = sg_scatg2virt(sclp)) {
+ if (usglen <= 0)
+ break;
+ if (ksglen > usglen) {
+ if (usglen >= num_xfer) {
+ if (__copy_to_user
+ (up, p, num_xfer))
+ return -EFAULT;
+ return 0;
+ }
+ if (__copy_to_user(up, p, usglen))
+ return -EFAULT;
+ p += usglen;
+ ksglen -= usglen;
+ break;
+ } else {
+ if (ksglen >= num_xfer) {
+ if (__copy_to_user
+ (up, p, num_xfer))
+ return -EFAULT;
+ return 0;
+ }
+ if (__copy_to_user(up, p, ksglen))
+ return -EFAULT;
+ up += ksglen;
+ usglen -= ksglen;
+ }
+ ++k;
+ if (k >= schp->k_use_sg)
+ return 0;
+ }
+ }
+ }
+ return 0;
+}
+
+static int
+sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
+{
+ Sg_scatter_hold *schp = &srp->data;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
+ num_read_xfer));
+ if ((!outp) || (num_read_xfer <= 0))
+ return 0;
+ if (schp->k_use_sg > 0) {
+ int k, num;
+ struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
+
+ for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
+ ++k, ++sclp) {
+ num = (int) sclp->length;
+ if (num > num_read_xfer) {
+ if (__copy_to_user
+ (outp, sg_scatg2virt(sclp), num_read_xfer))
+ return -EFAULT;
+ break;
+ } else {
+ if (__copy_to_user
+ (outp, sg_scatg2virt(sclp), num))
+ return -EFAULT;
+ num_read_xfer -= num;
+ if (num_read_xfer <= 0)
+ break;
+ outp += num;
+ }
+ }
+ } else {
+ if (__copy_to_user(outp, schp->buffer, num_read_xfer))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static void
+sg_build_reserve(Sg_fd * sfp, int req_size)
+{
+ Sg_scatter_hold *schp = &sfp->reserve;
+
+ SCSI_LOG_TIMEOUT(4, printk("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(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;
+
+ srp->res_used = 1;
+ SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
+ size = (size + 1) & (~1); /* round to even for aha1542 */
+ if (rsv_schp->k_use_sg > 0) {
+ int k, num;
+ int rem = size;
+ struct scatterlist *sclp =
+ (struct scatterlist *) rsv_schp->buffer;
+
+ for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
+ num = (int) sclp->length;
+ if (rem <= num) {
+ if (0 == k) {
+ req_schp->k_use_sg = 0;
+ req_schp->buffer = sg_scatg2virt(sclp);
+ } else {
+ sfp->save_scat_len = num;
+ sclp->length = (unsigned) rem;
+ req_schp->k_use_sg = k + 1;
+ req_schp->sglist_len =
+ rsv_schp->sglist_len;
+ req_schp->buffer = rsv_schp->buffer;
+ }
+ req_schp->bufflen = size;
+ req_schp->b_malloc_len = rsv_schp->b_malloc_len;
+ break;
+ } else
+ rem -= num;
+ }
+ if (k >= rsv_schp->k_use_sg)
+ SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
+ } else {
+ req_schp->k_use_sg = 0;
+ req_schp->bufflen = size;
+ req_schp->buffer = rsv_schp->buffer;
+ req_schp->b_malloc_len = rsv_schp->b_malloc_len;
+ }
+}
+
+static void
+sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
+{
+ Sg_scatter_hold *req_schp = &srp->data;
+ Sg_scatter_hold *rsv_schp = &sfp->reserve;
+
+ SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
+ (int) req_schp->k_use_sg));
+ if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
+ struct scatterlist *sclp =
+ (struct scatterlist *) rsv_schp->buffer;
+
+ if (sfp->save_scat_len > 0)
+ (sclp + (req_schp->k_use_sg - 1))->length =
+ (unsigned) sfp->save_scat_len;
+ else
+ SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
+ }
+ req_schp->k_use_sg = 0;
+ req_schp->bufflen = 0;
+ req_schp->buffer = NULL;
+ req_schp->sglist_len = 0;
+ sfp->save_scat_len = 0;
+ srp->res_used = 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);
+ for (resp = sfp->headrp; resp; resp = resp->nextrp) {
+ /* 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 */
+ break;
+ }
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return resp;
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+static Sg_request *
+sg_get_nth_request(Sg_fd * sfp, int nth)
+{
+ Sg_request *resp;
+ unsigned long iflags;
+ int k;
+
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ for (k = 0, resp = sfp->headrp; resp && (k < nth);
+ ++k, resp = resp->nextrp) ;
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return resp;
+}
+#endif
+
+/* always adds to end of list */
+static Sg_request *
+sg_add_request(Sg_fd * sfp)
+{
+ int k;
+ unsigned long iflags;
+ Sg_request *resp;
+ Sg_request *rp = sfp->req_arr;
+
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ resp = sfp->headrp;
+ if (!resp) {
+ memset(rp, 0, sizeof (Sg_request));
+ rp->parentfp = sfp;
+ resp = rp;
+ sfp->headrp = resp;
+ } else {
+ if (0 == sfp->cmd_q)
+ resp = NULL; /* command queuing disallowed */
+ else {
+ for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
+ if (!rp->parentfp)
+ break;
+ }
+ if (k < SG_MAX_QUEUE) {
+ memset(rp, 0, sizeof (Sg_request));
+ rp->parentfp = sfp;
+ while (resp->nextrp)
+ resp = resp->nextrp;
+ resp->nextrp = rp;
+ resp = rp;
+ } else
+ resp = NULL;
+ }
+ }
+ if (resp) {
+ resp->nextrp = NULL;
+ resp->header.duration = jiffies;
+ resp->my_cmdp = NULL;
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return resp;
+}
+
+/* Return of 1 for found; 0 for not found */
+static int
+sg_remove_request(Sg_fd * sfp, Sg_request * srp)
+{
+ Sg_request *prev_rp;
+ Sg_request *rp;
+ unsigned long iflags;
+ int res = 0;
+
+ if ((!sfp) || (!srp) || (!sfp->headrp))
+ return res;
+ write_lock_irqsave(&sfp->rq_list_lock, iflags);
+ prev_rp = sfp->headrp;
+ if (srp == prev_rp) {
+ sfp->headrp = prev_rp->nextrp;
+ prev_rp->parentfp = NULL;
+ res = 1;
+ } else {
+ while ((rp = prev_rp->nextrp)) {
+ if (srp == rp) {
+ prev_rp->nextrp = rp->nextrp;
+ rp->parentfp = NULL;
+ res = 1;
+ break;
+ }
+ prev_rp = rp;
+ }
+ }
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return res;
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+static Sg_fd *
+sg_get_nth_sfp(Sg_device * sdp, int nth)
+{
+ Sg_fd *resp;
+ unsigned long iflags;
+ int k;
+
+ read_lock_irqsave(&sg_dev_arr_lock, iflags);
+ for (k = 0, resp = sdp->headfp; resp && (k < nth);
+ ++k, resp = resp->nextfp) ;
+ read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ return resp;
+}
+#endif
+
+static Sg_fd *
+sg_add_sfp(Sg_device * sdp, int dev)
+{
+ Sg_fd *sfp;
+ unsigned long iflags;
+
+ sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
+ if (!sfp)
+ return NULL;
+ memset(sfp, 0, sizeof (Sg_fd));
+ init_waitqueue_head(&sfp->read_wait);
+ rwlock_init(&sfp->rq_list_lock);
+
+ sfp->timeout = SG_DEFAULT_TIMEOUT;
+ sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
+ sfp->force_packid = SG_DEF_FORCE_PACK_ID;
+ sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
+ sdp->device->host->unchecked_isa_dma : 1;
+ sfp->cmd_q = SG_DEF_COMMAND_Q;
+ sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
+ sfp->parentdp = sdp;
+ write_lock_irqsave(&sg_dev_arr_lock, iflags);
+ if (!sdp->headfp)
+ sdp->headfp = sfp;
+ else { /* add to tail of existing list */
+ Sg_fd *pfp = sdp->headfp;
+ while (pfp->nextfp)
+ pfp = pfp->nextfp;
+ pfp->nextfp = sfp;
+ }
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
+ sg_build_reserve(sfp, sg_big_buff);
+ SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
+ sfp->reserve.bufflen, sfp->reserve.k_use_sg));
+ return sfp;
+}
+
+static void
+__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
+{
+ Sg_fd *fp;
+ Sg_fd *prev_fp;
+
+ prev_fp = sdp->headfp;
+ if (sfp == prev_fp)
+ sdp->headfp = prev_fp->nextfp;
+ else {
+ while ((fp = prev_fp->nextfp)) {
+ if (sfp == fp) {
+ prev_fp->nextfp = fp->nextfp;
+ break;
+ }
+ prev_fp = fp;
+ }
+ }
+ if (sfp->reserve.bufflen > 0) {
+ SCSI_LOG_TIMEOUT(6,
+ printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
+ (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
+ if (sfp->mmap_called)
+ sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
+ sg_remove_scat(&sfp->reserve);
+ }
+ sfp->parentdp = NULL;
+ SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
+ sg_page_free((char *) sfp, sizeof (Sg_fd));
+}
+
+/* Returns 0 in normal case, 1 when detached and sdp object removed */
+static int
+sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
+{
+ Sg_request *srp;
+ Sg_request *tsrp;
+ int dirty = 0;
+ int res = 0;
+
+ for (srp = sfp->headrp; srp; srp = tsrp) {
+ tsrp = srp->nextrp;
+ if (sg_srp_done(srp, sfp))
+ sg_finish_rem_req(srp);
+ else
+ ++dirty;
+ }
+ if (0 == dirty) {
+ unsigned long iflags;
+
+ write_lock_irqsave(&sg_dev_arr_lock, iflags);
+ __sg_remove_sfp(sdp, sfp);
+ if (sdp->detached && (NULL == sdp->headfp)) {
+ int k, maxd;
+
+ maxd = sg_dev_max;
+ for (k = 0; k < maxd; ++k) {
+ if (sdp == sg_dev_arr[k])
+ break;
+ }
+ if (k < maxd)
+ sg_dev_arr[k] = NULL;
+ kfree((char *) sdp);
+ res = 1;
+ }
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ } else {
+ /* MOD_INC's to inhibit unloading sg and associated adapter driver */
+ /* only bump the access_count if we actually succeeded in
+ * throwing another counter on the host module */
+ scsi_device_get(sdp->device); /* XXX: retval ignored? */
+ sfp->closed = 1; /* flag dirty state on this fd */
+ SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
+ dirty));
+ }
+ return res;
+}
+
+static int
+sg_res_in_use(Sg_fd * sfp)
+{
+ const Sg_request *srp;
+ unsigned long iflags;
+
+ read_lock_irqsave(&sfp->rq_list_lock, iflags);
+ for (srp = sfp->headrp; srp; srp = srp->nextrp)
+ if (srp->res_used)
+ break;
+ read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return srp ? 1 : 0;
+}
+
+/* If retSzp==NULL want exact size or fail */
+static char *
+sg_page_malloc(int rqSz, int lowDma, int *retSzp)
+{
+ char *resp = NULL;
+ int page_mask;
+ int order, a_size;
+ int resSz = rqSz;
+
+ if (rqSz <= 0)
+ return resp;
+
+ if (lowDma)
+ page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
+ else
+ page_mask = GFP_ATOMIC | __GFP_NOWARN;
+
+ for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
+ order++, a_size <<= 1) ;
+ resp = (char *) __get_free_pages(page_mask, order);
+ while ((!resp) && order && retSzp) {
+ --order;
+ a_size >>= 1; /* divide by 2, until PAGE_SIZE */
+ resp = (char *) __get_free_pages(page_mask, order); /* try half */
+ resSz = a_size;
+ }
+ if (resp) {
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ memset(resp, 0, resSz);
+ if (retSzp)
+ *retSzp = resSz;
+ }
+ return resp;
+}
+
+static void
+sg_page_free(char *buff, int size)
+{
+ int order, a_size;
+
+ if (!buff)
+ return;
+ for (order = 0, a_size = PAGE_SIZE; a_size < size;
+ order++, a_size <<= 1) ;
+ free_pages((unsigned long) buff, order);
+}
+
+#ifndef MAINTENANCE_IN_CMD
+#define MAINTENANCE_IN_CMD 0xa3
+#endif
+
+static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
+ INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
+ READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
+ SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
+};
+
+static int
+sg_allow_access(unsigned char opcode, char dev_type)
+{
+ int k;
+
+ if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
+ return 1;
+ for (k = 0; k < sizeof (allow_ops); ++k) {
+ if (opcode == allow_ops[k])
+ return 1;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+static int
+sg_last_dev(void)
+{
+ int k;
+ unsigned long iflags;
+
+ read_lock_irqsave(&sg_dev_arr_lock, iflags);
+ for (k = sg_dev_max - 1; k >= 0; --k)
+ if (sg_dev_arr[k] && sg_dev_arr[k]->device)
+ break;
+ read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ return k + 1; /* origin 1 */
+}
+#endif
+
+static Sg_device *
+sg_get_dev(int dev)
+{
+ Sg_device *sdp = NULL;
+ unsigned long iflags;
+
+ if (sg_dev_arr && (dev >= 0)) {
+ read_lock_irqsave(&sg_dev_arr_lock, iflags);
+ if (dev < sg_dev_max)
+ sdp = sg_dev_arr[dev];
+ read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ }
+ return sdp;
+}
+
+#ifdef CONFIG_SCSI_PROC_FS
+
+static struct proc_dir_entry *sg_proc_sgp = NULL;
+
+static char sg_proc_sg_dirname[] = "scsi/sg";
+
+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 struct file_operations adio_fops = {
+ /* .owner, .read and .llseek added in sg_proc_init() */
+ .open = sg_proc_single_open_adio,
+ .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 struct file_operations dressz_fops = {
+ .open = sg_proc_single_open_dressz,
+ .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_single_open_version(struct inode *inode, struct file *file);
+static struct file_operations version_fops = {
+ .open = sg_proc_single_open_version,
+ .release = single_release,
+};
+
+static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
+static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
+static struct file_operations devhdr_fops = {
+ .open = sg_proc_single_open_devhdr,
+ .release = single_release,
+};
+
+static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
+static int sg_proc_open_dev(struct inode *inode, struct file *file);
+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 struct file_operations dev_fops = {
+ .open = sg_proc_open_dev,
+ .release = seq_release,
+};
+static 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 int sg_proc_open_devstrs(struct inode *inode, struct file *file);
+static struct file_operations devstrs_fops = {
+ .open = sg_proc_open_devstrs,
+ .release = seq_release,
+};
+static 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 int sg_proc_open_debug(struct inode *inode, struct file *file);
+static struct file_operations debug_fops = {
+ .open = sg_proc_open_debug,
+ .release = seq_release,
+};
+static struct seq_operations debug_seq_ops = {
+ .start = dev_seq_start,
+ .next = dev_seq_next,
+ .stop = dev_seq_stop,
+ .show = sg_proc_seq_show_debug,
+};
+
+
+struct sg_proc_leaf {
+ const char * name;
+ struct file_operations * fops;
+};
+
+static struct sg_proc_leaf sg_proc_leaf_arr[] = {
+ {"allow_dio", &adio_fops},
+ {"debug", &debug_fops},
+ {"def_reserved_size", &dressz_fops},
+ {"device_hdr", &devhdr_fops},
+ {"devices", &dev_fops},
+ {"device_strs", &devstrs_fops},
+ {"version", &version_fops}
+};
+
+static int
+sg_proc_init(void)
+{
+ int k, mask;
+ int num_leaves =
+ sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
+ struct proc_dir_entry *pdep;
+ struct sg_proc_leaf * leaf;
+
+ sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
+ S_IFDIR | S_IRUGO | S_IXUGO, NULL);
+ if (!sg_proc_sgp)
+ return 1;
+ for (k = 0; k < num_leaves; ++k) {
+ leaf = &sg_proc_leaf_arr[k];
+ mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
+ pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
+ if (pdep) {
+ leaf->fops->owner = THIS_MODULE,
+ leaf->fops->read = seq_read,
+ leaf->fops->llseek = seq_lseek,
+ pdep->proc_fops = leaf->fops;
+ }
+ }
+ return 0;
+}
+
+static void
+sg_proc_cleanup(void)
+{
+ int k;
+ int num_leaves =
+ sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
+
+ if (!sg_proc_sgp)
+ return;
+ for (k = 0; k < num_leaves; ++k)
+ remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
+ remove_proc_entry(sg_proc_sg_dirname, NULL);
+}
+
+
+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 num;
+ char buff[11];
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ num = (count < 10) ? count : 10;
+ if (copy_from_user(buff, buffer, num))
+ return -EFAULT;
+ buff[num] = '\0';
+ sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 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 num;
+ unsigned long k = ULONG_MAX;
+ char buff[11];
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ num = (count < 10) ? count : 10;
+ if (copy_from_user(buff, buffer, num))
+ return -EFAULT;
+ buff[num] = '\0';
+ k = simple_strtoul(buff, NULL, 10);
+ 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_single_open_version(struct inode *inode, struct file *file)
+{
+ return single_open(file, sg_proc_seq_show_version, NULL);
+}
+
+static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
+{
+ seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
+ "online\n");
+ return 0;
+}
+
+static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
+{
+ return single_open(file, sg_proc_seq_show_devhdr, NULL);
+}
+
+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);
+
+ if (! it)
+ return NULL;
+ if (NULL == sg_dev_arr)
+ goto err1;
+ it->index = *pos;
+ it->max = sg_last_dev();
+ if (it->index >= it->max)
+ goto err1;
+ return it;
+err1:
+ kfree(it);
+ return NULL;
+}
+
+static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
+
+ *pos = ++it->index;
+ return (it->index < it->max) ? it : NULL;
+}
+
+static void dev_seq_stop(struct seq_file *s, void *v)
+{
+ kfree (v);
+}
+
+static int sg_proc_open_dev(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &dev_seq_ops);
+}
+
+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;
+
+ sdp = it ? sg_get_dev(it->index) : NULL;
+ if (sdp && (scsidp = sdp->device) && (!sdp->detached))
+ seq_printf(s, "%d\t%d\t%d\t%d\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) scsidp->device_busy,
+ (int) scsi_device_online(scsidp));
+ else
+ seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
+ return 0;
+}
+
+static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &devstrs_seq_ops);
+}
+
+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;
+
+ sdp = it ? sg_get_dev(it->index) : NULL;
+ if (sdp && (scsidp = sdp->device) && (!sdp->detached))
+ seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
+ scsidp->vendor, scsidp->model, scsidp->rev);
+ else
+ seq_printf(s, "<no active device>\n");
+ return 0;
+}
+
+static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
+{
+ int k, m, new_interface, blen, usg;
+ Sg_request *srp;
+ Sg_fd *fp;
+ const sg_io_hdr_t *hp;
+ const char * cp;
+
+ for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
+ seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
+ "(res)sgat=%d low_dma=%d\n", k + 1,
+ jiffies_to_msecs(fp->timeout),
+ fp->reserve.bufflen,
+ (int) fp->reserve.k_use_sg,
+ (int) fp->low_dma);
+ seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
+ (int) fp->cmd_q, (int) fp->force_packid,
+ (int) fp->keep_orphan, (int) fp->closed);
+ for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
+ 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_printf(s, cp);
+ blen = srp->my_cmdp ?
+ srp->my_cmdp->sr_bufflen : srp->data.bufflen;
+ usg = srp->my_cmdp ?
+ srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
+ seq_printf(s, srp->done ?
+ ((1 == srp->done) ? "rcv:" : "fin:")
+ : (srp->my_cmdp ? "act:" : "prior:"));
+ seq_printf(s, " id=%d blen=%d",
+ srp->header.pack_id, blen);
+ if (srp->done)
+ seq_printf(s, " dur=%d", hp->duration);
+ else
+ seq_printf(s, " t_o/elap=%d/%d",
+ new_interface ? hp->timeout : jiffies_to_msecs(fp->timeout),
+ jiffies_to_msecs(hp->duration ? (jiffies - hp->duration) : 0));
+ seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
+ (int) srp->data.cmd_opcode);
+ }
+ if (0 == m)
+ seq_printf(s, " No requests active\n");
+ }
+}
+
+static int sg_proc_open_debug(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &debug_seq_ops);
+}
+
+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;
+
+ if (it && (0 == it->index)) {
+ seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
+ "(origin 1)\n", sg_dev_max, (int)it->max);
+ seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
+ }
+ sdp = it ? sg_get_dev(it->index) : NULL;
+ if (sdp) {
+ struct scsi_device *scsidp = sdp->device;
+
+ if (NULL == scsidp) {
+ seq_printf(s, "device %d detached ??\n",
+ (int)it->index);
+ return 0;
+ }
+
+ if (sg_get_nth_sfp(sdp, 0)) {
+ seq_printf(s, " >>> device=%s ",
+ sdp->disk->disk_name);
+ if (sdp->detached)
+ seq_printf(s, "detached pending close ");
+ else
+ seq_printf
+ (s, "scsi%d chan=%d id=%d lun=%d em=%d",
+ scsidp->host->host_no,
+ scsidp->channel, scsidp->id,
+ scsidp->lun,
+ scsidp->host->hostt->emulated);
+ seq_printf(s, " sg_tablesize=%d excl=%d\n",
+ sdp->sg_tablesize, sdp->exclude);
+ }
+ sg_proc_debug_helper(s, sdp);
+ }
+ return 0;
+}
+
+#endif /* CONFIG_SCSI_PROC_FS */
+
+module_init(init_sg);
+module_exit(exit_sg);
+MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
