diff mbox series

[v3,7/8] buffer: Improve bdev_getblk documentation

Message ID 20240416031754.4076917-8-willy@infradead.org (mailing list archive)
State New, archived
Headers show
Series Improve buffer head documentation | expand

Commit Message

Matthew Wilcox April 16, 2024, 3:17 a.m. UTC 
Add some more information about the state of the buffer_head returned.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/buffer.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/fs/buffer.c b/fs/buffer.c
index 60829312787a..ed698caa8834 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1424,6 +1424,11 @@  EXPORT_SYMBOL(__find_get_block);
  * @size: The size of buffer_heads for this @bdev.
  * @gfp: The memory allocation flags to use.
  *
+ * The returned buffer head has its reference count incremented, but is
+ * not locked.  The caller should call brelse() when it has finished
+ * with the buffer.  The buffer may not be uptodate.  If needed, the
+ * caller can bring it uptodate either by reading it or overwriting it.
+ *
  * Return: The buffer head, or NULL if memory could not be allocated.
  */
 struct buffer_head *bdev_getblk(struct block_device *bdev, sector_t block,