1 files changed, 336 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
new file mode 100644
index 000000000000..a50958b1b6ee
--- /dev/null
+++ b/drivers/scsi/scsi_proc.c
@@ -0,0 +1,336 @@
+/*
+ * linux/drivers/scsi/scsi_proc.c
+ *
+ * The functions in this file provide an interface between
+ * the PROC file system and the SCSI device drivers
+ * It is mainly used for debugging, statistics and to pass 
+ * information directly to the lowlevel driver.
+ *
+ * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de 
+ * Version: 0.99.8   last change: 95/09/13
+ * 
+ * generic command parser provided by: 
+ * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
+ *
+ * generic_proc_info() support of xxxx_info() by:
+ * Michael A. Griffith <grif@acm.org>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+
+/* 4K page size, but our output routines, use some slack for overruns */
+#define PROC_BLOCK_SIZE (3*1024)
+
+static struct proc_dir_entry *proc_scsi;
+
+/* Protect sht->present and sht->proc_dir */
+static DECLARE_MUTEX(global_host_template_sem);
+
+static int proc_scsi_read(char *buffer, char **start, off_t offset,
+                          int length, int *eof, void *data)
+{
+        struct Scsi_Host *shost = data;
+        int n;
+
+        n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
+        *eof = (n < length);
+
+        return n;
+}
+
+static int proc_scsi_write_proc(struct file *file, const char __user *buf,
+                           unsigned long count, void *data)
+{
+        struct Scsi_Host *shost = data;
+        ssize_t ret = -ENOMEM;
+        char *page;
+        char *start;
+    
+        if (count > PROC_BLOCK_SIZE)
+                return -EOVERFLOW;
+
+        page = (char *)__get_free_page(GFP_KERNEL);
+        if (page) {
+                ret = -EFAULT;
+                if (copy_from_user(page, buf, count))
+                        goto out;
+                ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
+        }
+out:
+        free_page((unsigned long)page);
+        return ret;
+}
+
+void scsi_proc_hostdir_add(struct scsi_host_template *sht)
+{
+        if (!sht->proc_info)
+                return;
+
+        down(&global_host_template_sem);
+        if (!sht->present++) {
+                sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
+                if (!sht->proc_dir)
+                        printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
+                               __FUNCTION__, sht->proc_name);
+                else
+                        sht->proc_dir->owner = sht->module;
+        }
+        up(&global_host_template_sem);
+}
+
+void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
+{
+        if (!sht->proc_info)
+                return;
+
+        down(&global_host_template_sem);
+        if (!--sht->present && sht->proc_dir) {
+                remove_proc_entry(sht->proc_name, proc_scsi);
+                sht->proc_dir = NULL;
+        }
+        up(&global_host_template_sem);
+}
+
+void scsi_proc_host_add(struct Scsi_Host *shost)
+{
+        struct scsi_host_template *sht = shost->hostt;
+        struct proc_dir_entry *p;
+        char name[10];
+
+        if (!sht->proc_dir)
+                return;
+
+        sprintf(name,"%d", shost->host_no);
+        p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
+                        sht->proc_dir, proc_scsi_read, shost);
+        if (!p) {
+                printk(KERN_ERR "%s: Failed to register host %d in"
+                       "%s\n", __FUNCTION__, shost->host_no,
+                       sht->proc_name);
+                return;
+        } 
+
+        p->write_proc = proc_scsi_write_proc;
+        p->owner = sht->module;
+}
+
+void scsi_proc_host_rm(struct Scsi_Host *shost)
+{
+        char name[10];
+
+        if (!shost->hostt->proc_dir)
+                return;
+
+        sprintf(name,"%d", shost->host_no);
+        remove_proc_entry(name, shost->hostt->proc_dir);
+}
+
+static int proc_print_scsidevice(struct device *dev, void *data)
+{
+        struct scsi_device *sdev = to_scsi_device(dev);
+        struct seq_file *s = data;
+        int i;
+
+        seq_printf(s,
+                "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n  Vendor: ",
+                sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
+        for (i = 0; i < 8; i++) {
+                if (sdev->vendor[i] >= 0x20)
+                        seq_printf(s, "%c", sdev->vendor[i]);
+                else
+                        seq_printf(s, " ");
+        }
+
+        seq_printf(s, " Model: ");
+        for (i = 0; i < 16; i++) {
+                if (sdev->model[i] >= 0x20)
+                        seq_printf(s, "%c", sdev->model[i]);
+                else
+                        seq_printf(s, " ");
+        }
+
+        seq_printf(s, " Rev: ");
+        for (i = 0; i < 4; i++) {
+                if (sdev->rev[i] >= 0x20)
+                        seq_printf(s, "%c", sdev->rev[i]);
+                else
+                        seq_printf(s, " ");
+        }
+
+        seq_printf(s, "\n");
+
+        seq_printf(s, "  Type:   %s ",
+                     sdev->type < MAX_SCSI_DEVICE_CODE ?
+               scsi_device_types[(int) sdev->type] : "Unknown          ");
+        seq_printf(s, "               ANSI"
+                     " SCSI revision: %02x", (sdev->scsi_level - 1) ?
+                     sdev->scsi_level - 1 : 1);
+        if (sdev->scsi_level == 2)
+                seq_printf(s, " CCS\n");
+        else
+                seq_printf(s, "\n");
+
+        return 0;
+}
+
+static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
+{
+        struct Scsi_Host *shost;
+        int error = -ENXIO;
+
+        shost = scsi_host_lookup(host);
+        if (IS_ERR(shost))
+                return PTR_ERR(shost);
+
+        error = scsi_scan_host_selected(shost, channel, id, lun, 1);
+        scsi_host_put(shost);
+        return error;
+}
+
+static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
+{
+        struct scsi_device *sdev;
+        struct Scsi_Host *shost;
+        int error = -ENXIO;
+
+        shost = scsi_host_lookup(host);
+        if (IS_ERR(shost))
+                return PTR_ERR(shost);
+        sdev = scsi_device_lookup(shost, channel, id, lun);
+        if (sdev) {
+                scsi_remove_device(sdev);
+                scsi_device_put(sdev);
+                error = 0;
+        }
+
+        scsi_host_put(shost);
+        return error;
+}
+
+static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
+                               size_t length, loff_t *ppos)
+{
+        int host, channel, id, lun;
+        char *buffer, *p;
+        int err;
+
+        if (!buf || length > PAGE_SIZE)
+                return -EINVAL;
+
+        buffer = (char *)__get_free_page(GFP_KERNEL);
+        if (!buffer)
+                return -ENOMEM;
+
+        err = -EFAULT;
+        if (copy_from_user(buffer, buf, length))
+                goto out;
+
+        err = -EINVAL;
+        if (length < PAGE_SIZE)
+                buffer[length] = '\0';
+        else if (buffer[PAGE_SIZE-1])
+                goto out;
+
+        /*
+         * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
+         * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
+         */
+        if (!strncmp("scsi add-single-device", buffer, 22)) {
+                p = buffer + 23;
+
+                host = simple_strtoul(p, &p, 0);
+                channel = simple_strtoul(p + 1, &p, 0);
+                id = simple_strtoul(p + 1, &p, 0);
+                lun = simple_strtoul(p + 1, &p, 0);
+
+                err = scsi_add_single_device(host, channel, id, lun);
+                if (err >= 0)
+                        err = length;
+
+        /*
+         * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
+         * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
+         */
+        } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
+                p = buffer + 26;
+
+                host = simple_strtoul(p, &p, 0);
+                channel = simple_strtoul(p + 1, &p, 0);
+                id = simple_strtoul(p + 1, &p, 0);
+                lun = simple_strtoul(p + 1, &p, 0);
+
+                err = scsi_remove_single_device(host, channel, id, lun);
+        }
+
+ out:
+        free_page((unsigned long)buffer);
+        return err;
+}
+
+static int proc_scsi_show(struct seq_file *s, void *p)
+{
+        seq_printf(s, "Attached devices:\n");
+        bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
+        return 0;
+}
+
+static int proc_scsi_open(struct inode *inode, struct file *file)
+{
+        /*
+         * We don't really needs this for the write case but it doesn't
+         * harm either.
+         */
+        return single_open(file, proc_scsi_show, NULL);
+}
+
+static struct file_operations proc_scsi_operations = {
+        .open           = proc_scsi_open,
+        .read           = seq_read,
+        .write          = proc_scsi_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int __init scsi_init_procfs(void)
+{
+        struct proc_dir_entry *pde;
+
+        proc_scsi = proc_mkdir("scsi", NULL);
+        if (!proc_scsi)
+                goto err1;
+
+        pde = create_proc_entry("scsi/scsi", 0, NULL);
+        if (!pde)
+                goto err2;
+        pde->proc_fops = &proc_scsi_operations;
+
+        return 0;
+
+err2:
+        remove_proc_entry("scsi", NULL);
+err1:
+        return -ENOMEM;
+}
+
+void scsi_exit_procfs(void)
+{
+        remove_proc_entry("scsi/scsi", NULL);
+        remove_proc_entry("scsi", NULL);
+}