Add /proc interface for modifying debugging trace flags, from John M Cavallo.
authortpoynor <tpoynor>
Fri, 27 Jan 2006 23:54:21 +0000 (23:54 +0000)
committertpoynor <tpoynor>
Fri, 27 Jan 2006 23:54:21 +0000 (23:54 +0000)
yaffs_fs.c

index cc4f68a..c2ab888 100644 (file)
@@ -31,7 +31,7 @@
  */
 
 const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.40 2006-01-25 01:21:08 tpoynor Exp $";
+    "$Id: yaffs_fs.c,v 1.41 2006-01-27 23:54:21 tpoynor Exp $";
 extern const char *yaffs_guts_c_version;
 
 #include <linux/config.h>
@@ -48,6 +48,7 @@ extern const char *yaffs_guts_c_version;
 #include <linux/mtd/mtd.h>
 #include <linux/interrupt.h>
 #include <linux/string.h>
+#include <linux/ctype.h>
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 
@@ -1687,6 +1688,118 @@ static int yaffs_proc_read(char *page,
        return buf - page < count ? buf - page : count;
 }
 
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ */
+
+static struct {
+       char *mask_name;
+       unsigned mask_bitfield;
+} mask_flags[] = {
+       {"allocate", YAFFS_TRACE_ALLOCATE},
+       {"always", YAFFS_TRACE_ALWAYS},
+       {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+       {"buffers", YAFFS_TRACE_BUFFERS},
+       {"bug", YAFFS_TRACE_BUG},
+       {"deletion", YAFFS_TRACE_DELETION},
+       {"erase", YAFFS_TRACE_ERASE},
+       {"error", YAFFS_TRACE_ERROR},
+       {"gc_detail", YAFFS_TRACE_GC_DETAIL},
+       {"gc", YAFFS_TRACE_GC},
+       {"mtd", YAFFS_TRACE_MTD},
+       {"nandaccess", YAFFS_TRACE_NANDACCESS},
+       {"os", YAFFS_TRACE_OS},
+       {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+       {"scan", YAFFS_TRACE_SCAN},
+       {"tracing", YAFFS_TRACE_TRACING},
+       {"write", YAFFS_TRACE_WRITE},
+       {"all", 0xffffffff},
+       {"none", 0},
+       {NULL, 0},
+};
+
+static int yaffs_proc_write(struct file *file, const char *buf,
+                                        unsigned long count, void *data)
+{
+       unsigned rg = 0, mask_bitfield;
+       char *end, *mask_name;
+       int i;
+       int done = 0;
+       int add, len;
+       int pos = 0;
+
+       rg = yaffs_traceMask;
+
+       while (!done && (pos < count)) {
+               done = 1;
+               while ((pos < count) && isspace(buf[pos])) {
+                       pos++;
+               }
+
+               switch (buf[pos]) {
+               case '+':
+               case '-':
+               case '=':
+                       add = buf[pos];
+                       pos++;
+                       break;
+
+               default:
+                       add = ' ';
+                       break;
+               }
+               mask_name = NULL;
+               mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+               if (end > buf + pos) {
+                       mask_name = "numeral";
+                       len = end - (buf + pos);
+                       done = 0;
+               } else {
+
+                       for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                               len = strlen(mask_flags[i].mask_name);
+                               if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
+                                       mask_name = mask_flags[i].mask_name;
+                                       mask_bitfield = mask_flags[i].mask_bitfield;
+                                       done = 0;
+                                       break;
+                               }
+                       }
+               }
+
+               if (mask_name != NULL) {
+                       pos += len;
+                       done = 0;
+                       switch(add) {
+                       case '-':
+                               rg &= ~mask_bitfield;
+                               break;
+                       case '+':
+                               rg |= mask_bitfield;
+                               break;
+                       case '=':
+                               rg = mask_bitfield;
+                               break;
+                       default:
+                               rg |= mask_bitfield;
+                               break;
+                       }
+               }
+       }
+
+       yaffs_traceMask = rg;
+       if (rg & YAFFS_TRACE_ALWAYS) {
+               for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                       char flag;
+                       flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
+                       printk("%c%s\n", flag, mask_flags[i].mask_name);
+               }
+       }
+
+       return count;
+}
+
 /* Stuff to handle installation of file systems */
 struct file_system_to_install {
        struct file_system_type *fst;
@@ -1712,11 +1825,15 @@ static int __init init_yaffs_fs(void)
          ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
 
        /* Install the proc_fs entry */
-       my_proc_entry = create_proc_read_entry("yaffs",
+       my_proc_entry = create_proc_entry("yaffs",
                                               S_IRUGO | S_IFREG,
-                                              &proc_root,
-                                              yaffs_proc_read, NULL);
-       if (!my_proc_entry) {
+                                              &proc_root);
+
+       if (my_proc_entry) {
+               my_proc_entry->write_proc = yaffs_proc_write;
+               my_proc_entry->read_proc = yaffs_proc_read;
+               my_proc_entry->data = NULL;
+       } else {
                return -ENOMEM;
        }