block: clean up cmdfilter sysfs interface

This patch changes the interface of the cmd filter to use a +/-
notation like:

echo -- +0x02 +0x03 -0x08

If neither + or - is given it defaults to + (allow command).

Note: The interface was added in 2.6.17-rc1 and is unused and
undocumented so far so it's safe to change it.

Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Reviewed-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: jens.axboe@oracle.com
Cc: James.Bottomley@hansenpartnership.com
Cc: dan.j.williams@intel.com
Cc: pjones@redhat.com
Cc: viro@zeniv.linux.org.uk
Cc: dougg@torque.net
Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/cmd-filter.c b/block/cmd-filter.c
index 0e3a123..1d40262 100644 (file)
--- a/block/cmd-filter.c
+++ b/block/cmd-filter.c
@@ -20,7 +20,6 @@
 #include <linux/list.h>
 #include <linux/genhd.h>
 #include <linux/spinlock.h>
-#include <linux/parser.h>
 #include <linux/capability.h>
 #include <linux/bitops.h>
 
@@ -65,8 +64,7 @@ static ssize_t rcf_cmds_show(struct blk_cmd_filter *filter, char *page,
 
        for (i = 0; i < BLK_SCSI_MAX_CMDS; i++) {
                if (test_bit(i, okbits)) {
-                       sprintf(npage, "%02x", i);
-                       npage += 2;
+                       npage += sprintf(npage, "0x%02x", i);
                        if (i < BLK_SCSI_MAX_CMDS - 1)
                                sprintf(npage++, " ");
                }
@@ -92,33 +90,41 @@ static ssize_t rcf_writecmds_show(struct blk_cmd_filter *filter,
 static ssize_t rcf_cmds_store(struct blk_cmd_filter *filter,
                              const char *page, size_t count, int rw)
 {
-       ssize_t ret = 0;
        unsigned long okbits[BLK_SCSI_CMD_PER_LONG], *target_okbits;
-       int cmd, status, len;
-       substring_t ss;
-
-       memset(&okbits, 0, sizeof(okbits));
-
-       for (len = strlen(page); len > 0; len -= 3) {
-               if (len < 2)
-                       break;
-               ss.from = (char *) page + ret;
-               ss.to = (char *) page + ret + 2;
-               ret += 3;
-               status = match_hex(&ss, &cmd);
+       int cmd, set;
+       char *p, *status;
+
+       if (rw == READ) {
+               memcpy(&okbits, filter->read_ok, sizeof(okbits));
+               target_okbits = filter->read_ok;
+       } else {
+               memcpy(&okbits, filter->write_ok, sizeof(okbits));
+               target_okbits = filter->write_ok;
+       }
+
+       while ((p = strsep((char **)&page, " ")) != NULL) {
+               set = 1;
+
+               if (p[0] == '+') {
+                       p++;
+               } else if (p[0] == '-') {
+                       set = 0;
+                       p++;
+               }
+
+               cmd = simple_strtol(p, &status, 16);
+
                /* either of these cases means invalid input, so do nothing. */
-               if (status || cmd >= BLK_SCSI_MAX_CMDS)
+               if ((status == p) || cmd >= BLK_SCSI_MAX_CMDS)
                        return -EINVAL;
 
-               __set_bit(cmd, okbits);
+               if (set)
+                       __set_bit(cmd, okbits);
+               else
+                       __clear_bit(cmd, okbits);
        }
 
-       if (rw == READ)
-               target_okbits = filter->read_ok;
-       else
-               target_okbits = filter->write_ok;
-
-       memmove(target_okbits, okbits, sizeof(okbits));
+       memcpy(target_okbits, okbits, sizeof(okbits));
        return count;
 }