#include <linux/kref.h>
/*
- * Tracks changes to rchan_buf struct
+ * Tracks changes to rchan/rchan_buf structs
*/
-#define RELAYFS_CHANNEL_VERSION 5
+#define RELAYFS_CHANNEL_VERSION 6
/*
* Per-cpu relay channel buffer
struct rchan_callbacks *cb; /* client callbacks */
struct kref kref; /* channel refcount */
void *private_data; /* for user-defined data */
+ size_t last_toobig; /* tried to log event > subbuf size */
struct rchan_buf *buf[NR_CPUS]; /* per-cpu channel buffers */
};
-/*
- * Relayfs inode
- */
-struct relayfs_inode_info
-{
- struct inode vfs_inode;
- struct rchan_buf *buf;
-};
-
-static inline struct relayfs_inode_info *RELAYFS_I(struct inode *inode)
-{
- return container_of(inode, struct relayfs_inode_info, vfs_inode);
-}
-
/*
* Relay channel client callbacks
*/
*/
void (*buf_unmapped)(struct rchan_buf *buf,
struct file *filp);
+ /*
+ * create_buf_file - create file to represent a relayfs channel buffer
+ * @filename: the name of the file to create
+ * @parent: the parent of the file to create
+ * @mode: the mode of the file to create
+ * @buf: the channel buffer
+ * @is_global: outparam - set non-zero if the buffer should be global
+ *
+ * Called during relay_open(), once for each per-cpu buffer,
+ * to allow the client to create a file to be used to
+ * represent the corresponding channel buffer. If the file is
+ * created outside of relayfs, the parent must also exist in
+ * that filesystem.
+ *
+ * The callback should return the dentry of the file created
+ * to represent the relay buffer.
+ *
+ * Setting the is_global outparam to a non-zero value will
+ * cause relay_open() to create a single global buffer rather
+ * than the default set of per-cpu buffers.
+ *
+ * See Documentation/filesystems/relayfs.txt for more info.
+ */
+ struct dentry *(*create_buf_file)(const char *filename,
+ struct dentry *parent,
+ int mode,
+ struct rchan_buf *buf,
+ int *is_global);
+
+ /*
+ * remove_buf_file - remove file representing a relayfs channel buffer
+ * @dentry: the dentry of the file to remove
+ *
+ * Called during relay_close(), once for each per-cpu buffer,
+ * to allow the client to remove a file used to represent a
+ * channel buffer.
+ *
+ * The callback should return 0 if successful, negative if not.
+ */
+ int (*remove_buf_file)(struct dentry *dentry);
};
/*
extern struct dentry *relayfs_create_dir(const char *name,
struct dentry *parent);
extern int relayfs_remove_dir(struct dentry *dentry);
+extern struct dentry *relayfs_create_file(const char *name,
+ struct dentry *parent,
+ int mode,
+ struct file_operations *fops,
+ void *data);
+extern int relayfs_remove_file(struct dentry *dentry);
/**
* relay_write - write data into the channel
}
/*
- * exported relayfs file operations, fs/relayfs/inode.c
+ * exported relay file operations, fs/relayfs/inode.c
*/
-
-extern struct file_operations relayfs_file_operations;
+extern struct file_operations relay_file_operations;
#endif /* _LINUX_RELAYFS_FS_H */