path: root/arch/s390/hypfs/hypfs.h
diff options
authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2011-01-05 12:47:43 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:27 +0100
commit2fcb3686e1601cff992e026dceeab1b22dc81178 (patch)
tree6f2c62354f5fa445982f3e1575aac5e4758187ee /arch/s390/hypfs/hypfs.h
parent[S390] current_thread_info optimization (diff)
[S390] hypfs: Move buffer allocation from open to read
Currently the buffer for diagnose data is allocated in the open function of the debugfs file and is released in the close function. This has the drawback that a user (root) can pin that memory by not closing the file. This patch moves the buffer allocation to the read function. The buffer is automatically released after the buffer is copied to userspace. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
1 files changed, 31 insertions, 2 deletions
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
index fa487d4cc08b..80c1526f2af3 100644
--- a/arch/s390/hypfs/hypfs.h
+++ b/arch/s390/hypfs/hypfs.h
@@ -12,6 +12,8 @@
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/debugfs.h>
+#include <linux/workqueue.h>
+#include <linux/kref.h>
#define REG_FILE_MODE 0440
#define UPDATE_FILE_MODE 0220
@@ -38,6 +40,33 @@ extern int hypfs_vm_init(void);
extern void hypfs_vm_exit(void);
extern int hypfs_vm_create_files(struct super_block *sb, struct dentry *root);
-/* Directory for debugfs files */
-extern struct dentry *hypfs_dbfs_dir;
+/* debugfs interface */
+struct hypfs_dbfs_file;
+struct hypfs_dbfs_data {
+ void *buf;
+ void *buf_free_ptr;
+ size_t size;
+ struct hypfs_dbfs_file *dbfs_file;;
+ struct kref kref;
+struct hypfs_dbfs_file {
+ const char *name;
+ int (*data_create)(void **data, void **data_free_ptr,
+ size_t *size);
+ void (*data_free)(const void *buf_free_ptr);
+ /* Private data for hypfs_dbfs.c */
+ struct hypfs_dbfs_data *data;
+ struct delayed_work data_free_work;
+ struct mutex lock;
+ struct dentry *dentry;
+extern int hypfs_dbfs_init(void);
+extern void hypfs_dbfs_exit(void);
+extern int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df);
+extern void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df);
#endif /* _HYPFS_H_ */