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buffer: Use a folio in generic_write_end()
Replaces two implicit calls to compound_head() with one. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
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@ -2283,6 +2283,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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struct folio *folio = page_folio(page);
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struct inode *inode = mapping->host;
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loff_t old_size = inode->i_size;
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bool i_size_changed = false;
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@ -2293,7 +2294,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
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* No need to use i_size_read() here, the i_size cannot change under us
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* because we hold i_rwsem.
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*
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* But it's important to update i_size while still holding page lock:
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* But it's important to update i_size while still holding folio lock:
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* page writeout could otherwise come in and zero beyond i_size.
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*/
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if (pos + copied > inode->i_size) {
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@ -2301,8 +2302,8 @@ int generic_write_end(struct file *file, struct address_space *mapping,
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i_size_changed = true;
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}
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unlock_page(page);
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put_page(page);
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folio_unlock(folio);
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folio_put(folio);
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if (old_size < pos)
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pagecache_isize_extended(inode, old_size, pos);
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