patch-1.3.5 linux/drivers/scsi/scsi_proc.c

• Lines: 315
• Date: Thu Jun 29 12:37:45 1995
• Orig file: v1.3.4/linux/drivers/scsi/scsi_proc.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.4/linux/drivers/scsi/scsi_proc.c linux/drivers/scsi/scsi_proc.c
@@ -0,0 +1,314 @@
+/*
+ * 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: 0.99.5   last change: 95/06/28
+ * 
+ * generic command parser provided by: 
+ * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
+ */
+
+
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include "../block/blk.h"
+#include "scsi.h"
+#include "hosts.h"
+
+#ifndef TRUE
+#define TRUE  1
+#define FALSE 0
+#endif
+
+extern struct proc_dir_entry scsi_dir[];
+extern struct proc_dir_entry scsi_hba_dir[];
+extern int scsi_proc_info(char *, char **, off_t, int, int, int);
+ 
+
+int get_hba_index(int ino)
+{
+    Scsi_Host_Template *tpnt = scsi_hosts;
+    struct Scsi_Host *hpnt = scsi_hostlist;
+    uint x = 0;
+
+    while (tpnt) {
+	if (ino == tpnt->low_ino) 
+		return(x);
+	x += 3;
+	while (hpnt) {
+	    hpnt = hpnt->next;
+	    x++;
+	}
+	tpnt = tpnt->next;
+    }
+    return(0);
+}
+
+/* generic_proc_info
+ * Used if the driver currently has no own support for /proc/scsi
+ */
+int generic_proc_info(char *buffer, char **start, off_t offset, 
+		     int length, int inode, int inout)
+{
+    int len, pos, begin;
+
+    if(inout == TRUE)
+	return(-ENOSYS);  /* This is a no-op */
+    
+    begin = 0;
+    pos = len = sprintf(buffer, 
+			"The driver does not yet support the proc-fs\n");
+    if(pos < offset)
+    {
+	len = 0;
+	begin = pos;
+    }
+    
+    *start = buffer + (offset - begin);   /* Start of wanted data */
+    len -= (offset - begin);
+    if(len > length)
+	len = length;
+    
+    return(len);
+}
+
+/* dispatch_scsi_info is the central dispatcher 
+ * It is the interface between the proc-fs and the SCSI subsystem code
+ */
+extern int dispatch_scsi_info(int ino, char *buffer, char **start, 
+			      off_t offset, int length, int func)
+{
+    struct Scsi_Host *hpnt = scsi_hostlist;
+
+    if(func != 2) {    
+	if(ino == PROC_SCSI_SCSI) 
+	    return(scsi_proc_info(buffer, start, offset, length, 
+				  hpnt->host_no, func));
+	while(hpnt) {
+	    if (ino == (hpnt->host_no + PROC_SCSI_FILE)) 
+		return(hpnt->hostt->proc_info(buffer, start, offset, length, 
+					      hpnt->host_no, func));
+	    hpnt = hpnt->next;
+	}
+	return(-EBADF);
+    } else
+	return(get_hba_index(ino));
+}
+
+inline uint count_templates(void)
+{
+    Scsi_Host_Template *tpnt = scsi_hosts;
+    uint x = 0;
+    
+    while (tpnt) {
+	tpnt = tpnt->next;
+	x++;
+    }
+    return (x);
+}
+
+void build_proc_dir_hba_entries(void)
+{
+    Scsi_Host_Template *tpnt = scsi_hosts;
+    struct Scsi_Host *hpnt = scsi_hostlist;
+    static char names[PROC_SCSI_LAST - PROC_SCSI_FILE][3];
+    uint x, y;
+    
+    x = y = 0;
+
+    while (tpnt) {
+	scsi_hba_dir[x].low_ino = tpnt->low_ino;
+	scsi_hba_dir[x].namelen = 1;
+	scsi_hba_dir[x++].name = ".";
+	scsi_hba_dir[x].low_ino = PROC_SCSI;
+	scsi_hba_dir[x].namelen = 2;
+	scsi_hba_dir[x++].name = "..";
+	    
+	while (hpnt) {
+	    if (tpnt == hpnt->hostt) {
+		scsi_hba_dir[x].low_ino = PROC_SCSI_FILE + hpnt->host_no;
+		scsi_hba_dir[x].namelen = sprintf(names[y],"%d",hpnt->host_no);
+		scsi_hba_dir[x].name = names[y];
+		y++;
+		x++;
+	    }
+	    hpnt = hpnt->next;
+	}
+	
+	scsi_hba_dir[x].low_ino = 0;
+	scsi_hba_dir[x].namelen = 0;
+	scsi_hba_dir[x++].name = NULL;
+	tpnt = tpnt->next;
+    }    
+}
+
+void build_proc_dir_entries(void)
+{
+    Scsi_Host_Template *tpnt = scsi_hosts;
+    
+    uint newnum; 
+    uint x;
+    
+    newnum = count_templates();
+    
+    scsi_dir[0].low_ino = PROC_SCSI;
+    scsi_dir[0].namelen = 1;
+    scsi_dir[0].name = ".";
+    scsi_dir[1].low_ino = PROC_ROOT_INO;
+    scsi_dir[1].namelen = 2;
+    scsi_dir[1].name = "..";
+    scsi_dir[2].low_ino = PROC_SCSI_SCSI;
+    scsi_dir[2].namelen = 4;
+    scsi_dir[2].name = "scsi";
+    for(x = 3; x < newnum + 3; x++, tpnt = tpnt->next) {
+	scsi_dir[x].low_ino = tpnt->low_ino;
+	scsi_dir[x].namelen = strlen(tpnt->procname);
+	scsi_dir[x].name = tpnt->procname;
+    }
+    scsi_dir[x].low_ino = 0;
+    scsi_dir[x].namelen = 0;
+    scsi_dir[x].name = NULL;
+    
+    build_proc_dir_hba_entries();
+}
+
+
+/*
+ *  parseHandle *parseInit(char *buf, char *cmdList, int cmdNum); 
+ *	 	gets a pointer to a null terminated data buffer
+ *		and a list of commands with blanks as delimiter 
+ *      in between. 
+ *      The commands have to be alphanumerically sorted. 
+ *      cmdNum has to contain the number of commands.
+ *		On success, a pointer to a handle structure
+ *		is returned, NULL on failure
+ *
+ *	int parseOpt(parseHandle *handle, char **param);
+ *		processes the next parameter. On success, the
+ *		index of the appropriate command in the cmdList
+ *		is returned, starting with zero.
+ *		param points to the null terminated parameter string.
+ *		On failure, -1 is returned.
+ *
+ *	The databuffer buf may only contain pairs of commands
+ *	    options, separated by blanks:
+ *		<Command> <Parameter> [<Command> <Parameter>]*
+ */
+
+typedef struct
+{
+    char *buf,				   /* command buffer  */
+	 *cmdList,                         /* command list    */
+	 *bufPos,                          /* actual position */
+	 **cmdPos,                         /* cmdList index   */
+	 cmdNum;                           /* cmd number      */
+} parseHandle;
+	
+
+inline int parseFree (parseHandle *handle)               /* free memory     */
+{
+    kfree (handle->cmdPos);
+    kfree (handle);
+    
+    return(-1);
+}
+
+	
+parseHandle *parseInit(char *buf, char *cmdList, int cmdNum)
+{
+    char        *ptr;                               /* temp pointer    */
+    parseHandle *handle;                            /* new handle      */
+    
+    if (!buf || !cmdList)                           /* bad input ?     */
+	return(NULL);
+    if ((handle = (parseHandle*) kmalloc(sizeof(parseHandle), 1)) == 0)
+	return(NULL);                               /* out of memory   */
+    if ((handle->cmdPos = (char**) kmalloc(sizeof(int), cmdNum)) == 0) {
+	kfree(handle);
+	return(NULL);                               /* out of memory   */
+    }
+    
+    handle->buf     = handle->bufPos = buf;         /* init handle     */
+    handle->cmdList = cmdList;
+    handle->cmdNum  = cmdNum;
+    
+    handle->cmdPos[cmdNum = 0] = cmdList;
+    for (ptr = cmdList; *ptr; ptr++) {          /* scan command string */
+	if(*ptr == ' ') {                       /* and insert zeroes   */
+	    *ptr++ = 0;
+	    handle->cmdPos[++cmdNum] = ptr++;
+	} 
+    }
+    return(handle);
+}
+
+
+int parseOpt(parseHandle *handle, char **param)
+{
+    int  cmdIndex = 0, 
+	 cmdLen = 0;
+    char *startPos;
+    
+    if (!handle)                                    /* invalid handle  */
+	return(parseFree(handle));
+    /* skip spaces     */  
+    for (; *(handle->bufPos) && *(handle->bufPos) == ' '; handle->bufPos++);
+    if (!*(handle->bufPos))
+	return(parseFree(handle));                  /* end of data     */
+    
+    startPos = handle->bufPos;                      /* store cmd start */
+    for (; handle->cmdPos[cmdIndex][cmdLen] && *(handle->bufPos); handle->bufPos++)
+    {                                               /* no string end?  */
+	for (;;)
+	{
+	    if (*(handle->bufPos) == handle->cmdPos[cmdIndex][cmdLen])
+		break;                              /* char matches ?  */
+	    else
+		if (memcmp(startPos, (char*)(handle->cmdPos[++cmdIndex]), cmdLen))
+		    return(parseFree(handle));      /* unknown command */
+	    
+	    if (cmdIndex >= handle->cmdNum)
+		return(parseFree(handle));          /* unknown command */     
+	}
+	
+	cmdLen++;                                   /* next char       */
+    }
+    
+    /* Get param. First skip all blanks, then insert zero after param  */
+    
+    for (; *(handle->bufPos) && *(handle->bufPos) == ' '; handle->bufPos++);
+    *param = handle->bufPos; 
+    
+    for (; *(handle->bufPos) && *(handle->bufPos) != ' '; handle->bufPos++);
+    *(handle->bufPos++) = 0;
+    
+    return(cmdIndex);
+}
+
+
+/*
+ * Overrides for Emacs so that we get a uniform tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: nil
+ * tab-width: 8
+ * End:
+ */