Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 262 insertions, 0 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
new file mode 100644
index 000000000000..548556ff2506
--- /dev/null
+++ b/fs/debugfs/file.c
@@ -0,0 +1,262 @@
+/*
+ *  file.c - part of debugfs, a tiny little debug file system
+ *
+ *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *  Copyright (C) 2004 IBM Inc.
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License version
+ *      2 as published by the Free Software Foundation.
+ *
+ *  debugfs is for people to use instead of /proc or /sys.
+ *  See Documentation/DocBook/kernel-api for more details.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/debugfs.h>
+
+static ssize_t default_read_file(struct file *file, char __user *buf,
+                                 size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static ssize_t default_write_file(struct file *file, const char __user *buf,
+                                   size_t count, loff_t *ppos)
+{
+        return count;
+}
+
+static int default_open(struct inode *inode, struct file *file)
+{
+        if (inode->u.generic_ip)
+                file->private_data = inode->u.generic_ip;
+
+        return 0;
+}
+
+struct file_operations debugfs_file_operations = {
+        .read =         default_read_file,
+        .write =        default_write_file,
+        .open =         default_open,
+};
+
+#define simple_type(type, format, temptype, strtolfn)                           \
+static ssize_t read_file_##type(struct file *file, char __user *user_buf,       \
+                                size_t count, loff_t *ppos)                     \
+{                                                                               \
+        char buf[32];                                                           \
+        type *val = file->private_data;                                         \
+                                                                                \
+        snprintf(buf, sizeof(buf), format "\n", *val);                          \
+        return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));\
+}                                                                               \
+static ssize_t write_file_##type(struct file *file, const char __user *user_buf,\
+                                 size_t count, loff_t *ppos)                    \
+{                                                                               \
+        char *endp;                                                             \
+        char buf[32];                                                           \
+        int buf_size;                                                           \
+        type *val = file->private_data;                                         \
+        temptype tmp;                                                           \
+                                                                                \
+        memset(buf, 0x00, sizeof(buf));                                         \
+        buf_size = min(count, (sizeof(buf)-1));                                 \
+        if (copy_from_user(buf, user_buf, buf_size))                            \
+                return -EFAULT;                                                 \
+                                                                                \
+        tmp = strtolfn(buf, &endp, 0);                                          \
+        if ((endp == buf) || ((type)tmp != tmp))                                \
+                return -EINVAL;                                                 \
+        *val = tmp;                                                             \
+        return count;                                                           \
+}                                                                               \
+static struct file_operations fops_##type = {                                   \
+        .read =         read_file_##type,                                       \
+        .write =        write_file_##type,                                      \
+        .open =         default_open,                                           \
+};
+simple_type(u8, "%c", unsigned long, simple_strtoul);
+simple_type(u16, "%hi", unsigned long, simple_strtoul);
+simple_type(u32, "%i", unsigned long, simple_strtoul);
+
+/**
+ * debugfs_create_u8 - create a file in the debugfs filesystem that is used to read and write a unsigned 8 bit value.
+ *
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ *
+ * This function creates a file in debugfs with the given name that
+ * contains the value of the variable @value.  If the @mode variable is so
+ * set, it can be read from, and written to.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *debugfs_create_u8(const char *name, mode_t mode,
+                                 struct dentry *parent, u8 *value)
+{
+        return debugfs_create_file(name, mode, parent, value, &fops_u8);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_u8);
+
+/**
+ * debugfs_create_u16 - create a file in the debugfs filesystem that is used to read and write a unsigned 8 bit value.
+ *
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ *
+ * This function creates a file in debugfs with the given name that
+ * contains the value of the variable @value.  If the @mode variable is so
+ * set, it can be read from, and written to.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *debugfs_create_u16(const char *name, mode_t mode,
+                                  struct dentry *parent, u16 *value)
+{
+        return debugfs_create_file(name, mode, parent, value, &fops_u16);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_u16);
+
+/**
+ * debugfs_create_u32 - create a file in the debugfs filesystem that is used to read and write a unsigned 8 bit value.
+ *
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ *
+ * This function creates a file in debugfs with the given name that
+ * contains the value of the variable @value.  If the @mode variable is so
+ * set, it can be read from, and written to.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *debugfs_create_u32(const char *name, mode_t mode,
+                                 struct dentry *parent, u32 *value)
+{
+        return debugfs_create_file(name, mode, parent, value, &fops_u32);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_u32);
+
+static ssize_t read_file_bool(struct file *file, char __user *user_buf,
+                              size_t count, loff_t *ppos)
+{
+        char buf[3];
+        u32 *val = file->private_data;
+        
+        if (*val)
+                buf[0] = 'Y';
+        else
+                buf[0] = 'N';
+        buf[1] = '\n';
+        buf[2] = 0x00;
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
+                               size_t count, loff_t *ppos)
+{
+        char buf[32];
+        int buf_size;
+        u32 *val = file->private_data;
+
+        buf_size = min(count, (sizeof(buf)-1));
+        if (copy_from_user(buf, user_buf, buf_size))
+                return -EFAULT;
+
+        switch (buf[0]) {
+        case 'y':
+        case 'Y':
+        case '1':
+                *val = 1;
+                break;
+        case 'n':
+        case 'N':
+        case '0':
+                *val = 0;
+                break;
+        }
+        
+        return count;
+}
+
+static struct file_operations fops_bool = {
+        .read =         read_file_bool,
+        .write =        write_file_bool,
+        .open =         default_open,
+};
+
+/**
+ * debugfs_create_bool - create a file in the debugfs filesystem that is used to read and write a boolean value.
+ *
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ *
+ * This function creates a file in debugfs with the given name that
+ * contains the value of the variable @value.  If the @mode variable is so
+ * set, it can be read from, and written to.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *debugfs_create_bool(const char *name, mode_t mode,
+                                   struct dentry *parent, u32 *value)
+{
+        return debugfs_create_file(name, mode, parent, value, &fops_bool);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_bool);
+