Command to dump the metadata cache again

[lttng-modules.git] / lib / ringbuffer / vfs.h

diff --git a/lib/ringbuffer/vfs.h b/lib/ringbuffer/vfs.h
index 625f9c91d932c0833c2c45ac771b69b16ded3d0e..e2bc401002fd0b70d5cc5c6409f7c825d7e8b7d8 100644 (file)
--- a/lib/ringbuffer/vfs.h
+++ b/lib/ringbuffer/vfs.h
@@ -37,21 +37,37 @@ extern const struct file_operations lib_ring_buffer_file_operations;
  * Internal file operations.
  */
 
-int lib_ring_buffer_open(struct inode *inode, struct file *file);
-int lib_ring_buffer_release(struct inode *inode, struct file *file);
-unsigned int lib_ring_buffer_poll(struct file *filp, poll_table *wait);
+struct lib_ring_buffer;
+
+int lib_ring_buffer_open(struct inode *inode, struct file *file,
+               struct lib_ring_buffer *buf);
+int lib_ring_buffer_release(struct inode *inode, struct file *file,
+               struct lib_ring_buffer *buf);
+unsigned int lib_ring_buffer_poll(struct file *filp, poll_table *wait,
+               struct lib_ring_buffer *buf);
 ssize_t lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
-                                   struct pipe_inode_info *pipe, size_t len,
-                                   unsigned int flags);
-int lib_ring_buffer_mmap(struct file *filp, struct vm_area_struct *vma);
+               struct pipe_inode_info *pipe, size_t len,
+               unsigned int flags, struct lib_ring_buffer *buf);
+int lib_ring_buffer_mmap(struct file *filp, struct vm_area_struct *vma,
+               struct lib_ring_buffer *buf);
 
 /* Ring Buffer ioctl() and ioctl numbers */
-long lib_ring_buffer_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+long lib_ring_buffer_ioctl(struct file *filp, unsigned int cmd,
+               unsigned long arg, struct lib_ring_buffer *buf);
 #ifdef CONFIG_COMPAT
 long lib_ring_buffer_compat_ioctl(struct file *filp, unsigned int cmd,
-                                 unsigned long arg);
+               unsigned long arg, struct lib_ring_buffer *buf);
 #endif
 
+ssize_t vfs_lib_ring_buffer_file_splice_read(struct file *in, loff_t *ppos,
+               struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+loff_t vfs_lib_ring_buffer_no_llseek(struct file *file, loff_t offset,
+               int origin);
+int vfs_lib_ring_buffer_mmap(struct file *filp, struct vm_area_struct *vma);
+ssize_t vfs_lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
+               struct pipe_inode_info *pipe, size_t len,
+               unsigned int flags);
+
 /*
  * Use RING_BUFFER_GET_NEXT_SUBBUF / RING_BUFFER_PUT_NEXT_SUBBUF to read and
  * consume sub-buffers sequentially.
@@ -95,8 +111,23 @@ long lib_ring_buffer_compat_ioctl(struct file *filp, unsigned int cmd,
 #define RING_BUFFER_GET_MMAP_LEN               _IOR(0xF6, 0x0A, unsigned long)
 /* returns the offset of the subbuffer belonging to the mmap reader. */
 #define RING_BUFFER_GET_MMAP_READ_OFFSET       _IOR(0xF6, 0x0B, unsigned long)
-/* flush the current sub-buffer */
+/* Flush the current sub-buffer, if non-empty. */
 #define RING_BUFFER_FLUSH                      _IO(0xF6, 0x0C)
+/* Get the current version of the metadata cache (after a get_next). */
+#define RING_BUFFER_GET_METADATA_VERSION       _IOR(0xF6, 0x0D, uint64_t)
+/*
+ * Get a snapshot of the current ring buffer producer and consumer positions,
+ * regardless of whether or not the two positions are contained within the same
+ * sub-buffer.
+ */
+#define RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS  _IO(0xF6, 0x0E)
+/* Flush the current sub-buffer, even if empty. */
+#define RING_BUFFER_FLUSH_EMPTY                        _IO(0xF6, 0x0F)
+/*
+ * Reset the position of what has been consumed from the metadata cache to 0
+ * so it can be read again.
+ */
+#define RING_BUFFER_METADATA_CACHE_DUMP                _IO(0xF6, 0x10)
 
 #ifdef CONFIG_COMPAT
 /* Get a snapshot of the current ring buffer producer and consumer positions */
@@ -127,8 +158,20 @@ long lib_ring_buffer_compat_ioctl(struct file *filp, unsigned int cmd,
 #define RING_BUFFER_COMPAT_GET_MMAP_LEN                _IOR(0xF6, 0x0A, compat_ulong_t)
 /* returns the offset of the subbuffer belonging to the mmap reader. */
 #define RING_BUFFER_COMPAT_GET_MMAP_READ_OFFSET        _IOR(0xF6, 0x0B, compat_ulong_t)
-/* flush the current sub-buffer */
+/* Flush the current sub-buffer, if non-empty. */
 #define RING_BUFFER_COMPAT_FLUSH               RING_BUFFER_FLUSH
+/* Get the current version of the metadata cache (after a get_next). */
+#define RING_BUFFER_COMPAT_GET_METADATA_VERSION        RING_BUFFER_GET_METADATA_VERSION
+/*
+ * Get a snapshot of the current ring buffer producer and consumer positions,
+ * regardless of whether or not the two positions are contained within the same
+ * sub-buffer.
+ */
+#define RING_BUFFER_COMPAT_SNAPSHOT_SAMPLE_POSITIONS   \
+       RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS
+/* Flush the current sub-buffer, even if empty. */
+#define RING_BUFFER_COMPAT_FLUSH_EMPTY                 \
+       RING_BUFFER_FLUSH_EMPTY
 #endif /* CONFIG_COMPAT */
 
 #endif /* _LIB_RING_BUFFER_VFS_H */