fs/buffer: add folio_set_bh helper
Patch series "convert create_page_buffers to folio_create_buffers". One of the first kernel panic we hit when we try to increase the block size > 4k is inside create_page_buffers()[1]. Even though buffer.c function do not support large folios (folios > PAGE_SIZE) at the moment, these changes are required when we want to remove that constraint. This patch (of 4): The folio version of set_bh_page(). This is required to convert create_page_buffers() to folio_create_buffers() later in the series. Link: https://lkml.kernel.org/r/20230417123618.22094-1-p.raghav@samsung.com Link: https://lkml.kernel.org/r/20230417123618.22094-2-p.raghav@samsung.com Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Luis Chamberlain <mcgrof@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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15
fs/buffer.c
15
fs/buffer.c
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@ -1485,6 +1485,21 @@ void set_bh_page(struct buffer_head *bh,
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}
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EXPORT_SYMBOL(set_bh_page);
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void folio_set_bh(struct buffer_head *bh, struct folio *folio,
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unsigned long offset)
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{
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bh->b_folio = folio;
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BUG_ON(offset >= folio_size(folio));
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if (folio_test_highmem(folio))
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/*
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* This catches illegal uses and preserves the offset:
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*/
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bh->b_data = (char *)(0 + offset);
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else
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bh->b_data = folio_address(folio) + offset;
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}
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EXPORT_SYMBOL(folio_set_bh);
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/*
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* Called when truncating a buffer on a page completely.
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*/
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@ -196,6 +196,8 @@ void mark_buffer_write_io_error(struct buffer_head *bh);
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void touch_buffer(struct buffer_head *bh);
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void set_bh_page(struct buffer_head *bh,
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struct page *page, unsigned long offset);
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void folio_set_bh(struct buffer_head *bh, struct folio *folio,
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unsigned long offset);
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bool try_to_free_buffers(struct folio *);
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struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
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bool retry);
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