fscrypt: convert bh_get_inode_and_lblk_num to use a folio

Patch series "Remove page_mapping()".

There are only a few users left.  Convert them all to either call
folio_mapping() or just use folio->mapping directly.

This patch (of 6):

Remove uses of page->index, page_mapping() and b_page.  Saves a call
to compound_head().

Link: https://lkml.kernel.org/r/20240423225552.4113447-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20240423225552.4113447-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c
index b4002aea7cdb9d9b0adf873f74b901d7cb05a34c..40de69860dcf976f56d31fe5053eca766932a599 100644 (file)
--- a/fs/crypto/inline_crypt.c
+++ b/fs/crypto/inline_crypt.c
@@ -284,7 +284,7 @@ static bool bh_get_inode_and_lblk_num(const struct buffer_head *bh,
                                      const struct inode **inode_ret,
                                      u64 *lblk_num_ret)
 {
-       struct page *page = bh->b_page;
+       struct folio *folio = bh->b_folio;
        const struct address_space *mapping;
        const struct inode *inode;
 
@@ -292,13 +292,13 @@ static bool bh_get_inode_and_lblk_num(const struct buffer_head *bh,
         * The ext4 journal (jbd2) can submit a buffer_head it directly created
         * for a non-pagecache page.  fscrypt doesn't care about these.
         */
-       mapping = page_mapping(page);
+       mapping = folio_mapping(folio);
        if (!mapping)
                return false;
        inode = mapping->host;
 
        *inode_ret = inode;
-       *lblk_num_ret = ((u64)page->index << (PAGE_SHIFT - inode->i_blkbits)) +
+       *lblk_num_ret = ((u64)folio->index << (PAGE_SHIFT - inode->i_blkbits)) +
                        (bh_offset(bh) >> inode->i_blkbits);
        return true;
 }