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buffer: improve bdev_getblk documentation
Add some more information about the state of the buffer_head returned. Link: https://lkml.kernel.org/r/20240416031754.4076917-8-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Pankaj Raghav <p.raghav@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1424,6 +1424,11 @@ EXPORT_SYMBOL(__find_get_block);
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* @size: The size of buffer_heads for this @bdev.
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* @gfp: The memory allocation flags to use.
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*
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* The returned buffer head has its reference count incremented, but is
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* not locked. The caller should call brelse() when it has finished
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* with the buffer. The buffer may not be uptodate. If needed, the
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* caller can bring it uptodate either by reading it or overwriting it.
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*
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* Return: The buffer head, or NULL if memory could not be allocated.
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*/
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struct buffer_head *bdev_getblk(struct block_device *bdev, sector_t block,
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