Merge with /shiny/git/linux-2.6/.git

[karo-tx-linux.git] / fs / sysfs / file.c

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 352f966a1174681f0c1e6a5801942b16d8df7d40..335288b9be0f1301c42838b98d760ca0c33c4344 100644 (file)
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -3,8 +3,9 @@
  */
 
 #include <linux/module.h>
-#include <linux/dnotify.h>
+#include <linux/fsnotify.h>
 #include <linux/kobject.h>
+#include <linux/namei.h>
 #include <asm/uaccess.h>
 #include <asm/semaphore.h>
 
@@ -13,7 +14,7 @@
 #define to_subsys(k) container_of(k,struct subsystem,kset.kobj)
 #define to_sattr(a) container_of(a,struct subsys_attribute,attr)
 
-/**
+/*
  * Subsystem file operations.
  * These operations allow subsystems to have files that can be 
  * read/written. 
@@ -23,7 +24,7 @@ subsys_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
 {
        struct subsystem * s = to_subsys(kobj);
        struct subsys_attribute * sattr = to_sattr(attr);
-       ssize_t ret = 0;
+       ssize_t ret = -EIO;
 
        if (sattr->show)
                ret = sattr->show(s,page);
@@ -36,7 +37,7 @@ subsys_attr_store(struct kobject * kobj, struct attribute * attr,
 {
        struct subsystem * s = to_subsys(kobj);
        struct subsys_attribute * sattr = to_sattr(attr);
-       ssize_t ret = 0;
+       ssize_t ret = -EIO;
 
        if (sattr->store)
                ret = sattr->store(s,page,count);
@@ -96,7 +97,7 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer
 /**
  *     flush_read_buffer - push buffer to userspace.
  *     @buffer:        data buffer for file.
- *     @userbuf:       user-passed buffer.
+ *     @buf:           user-passed buffer.
  *     @count:         number of bytes requested.
  *     @ppos:          file position.
  *
@@ -164,7 +165,7 @@ out:
 /**
  *     fill_write_buffer - copy buffer from userspace.
  *     @buffer:        data buffer for file.
- *     @userbuf:       data from user.
+ *     @buf:           data from user.
  *     @count:         number of bytes in @userbuf.
  *
  *     Allocate @buffer->page if it hasn't been already, then
@@ -182,7 +183,7 @@ fill_write_buffer(struct sysfs_buffer * buffer, const char __user * buf, size_t
                return -ENOMEM;
 
        if (count >= PAGE_SIZE)
-               count = PAGE_SIZE - 1;
+               count = PAGE_SIZE;
        error = copy_from_user(buffer->page,buf,count);
        buffer->needs_read_fill = 1;
        return error ? -EFAULT : count;
@@ -191,8 +192,9 @@ fill_write_buffer(struct sysfs_buffer * buffer, const char __user * buf, size_t
 
 /**
  *     flush_write_buffer - push buffer to kobject.
- *     @file:          file pointer.
+ *     @dentry:        dentry to the attribute
  *     @buffer:        data buffer for file.
+ *     @count:         number of bytes
  *
  *     Get the correct pointers for the kobject and the attribute we're
  *     dealing with, then call the store() method for the attribute, 
@@ -389,9 +391,6 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)
  * sysfs_update_file - update the modified timestamp on an object attribute.
  * @kobj: object we're acting for.
  * @attr: attribute descriptor.
- *
- * Also call dnotify for the dentry, which lots of userspace programs
- * use.
  */
 int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
 {
@@ -400,13 +399,13 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
        int res = -ENOENT;
 
        down(&dir->d_inode->i_sem);
-       victim = sysfs_get_dentry(dir, attr->name);
+       victim = lookup_one_len(attr->name, dir, strlen(attr->name));
        if (!IS_ERR(victim)) {
                /* make sure dentry is really there */
                if (victim->d_inode && 
                    (victim->d_parent->d_inode == dir->d_inode)) {
                        victim->d_inode->i_mtime = CURRENT_TIME;
-                       dnotify_parent(victim, DN_MODIFY);
+                       fsnotify_modify(victim);
 
                        /**
                         * Drop reference from initial sysfs_get_dentry().
@@ -427,6 +426,41 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
 }
 
 
+/**
+ * sysfs_chmod_file - update the modified mode value on an object attribute.
+ * @kobj: object we're acting for.
+ * @attr: attribute descriptor.
+ * @mode: file permissions.
+ *
+ */
+int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
+{
+       struct dentry *dir = kobj->dentry;
+       struct dentry *victim;
+       struct sysfs_dirent *sd;
+       umode_t umode = (mode & S_IALLUGO) | S_IFREG;
+       int res = -ENOENT;
+
+       down(&dir->d_inode->i_sem);
+       victim = lookup_one_len(attr->name, dir, strlen(attr->name));
+       if (!IS_ERR(victim)) {
+               if (victim->d_inode &&
+                   (victim->d_parent->d_inode == dir->d_inode)) {
+                       sd = victim->d_fsdata;
+                       attr->mode = mode;
+                       sd->s_mode = umode;
+                       victim->d_inode->i_mode = umode;
+                       dput(victim);
+                       res = 0;
+               }
+       }
+       up(&dir->d_inode->i_sem);
+
+       return res;
+}
+EXPORT_SYMBOL_GPL(sysfs_chmod_file);
+
+
 /**
  *     sysfs_remove_file - remove an object attribute.
  *     @kobj:  object we're acting for.