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nilfs2: convert metadata aops from writepage to writepages

By implementing ->writepages instead of ->writepage, we remove a layer of
indirect function calls from the writeback path and the last use of struct
page in nilfs2.

[konishi.ryusuke@gmail.com: fixed panic by using buffer_migrate_folio_norefs]
Link: https://lkml.kernel.org/r/20241002150036.1339475-5-willy@infradead.org
Link: https://lkml.kernel.org/r/20241024092602.13395-13-konishi.ryusuke@gmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Matthew Wilcox (Oracle) and committed by
Andrew Morton 013a0705 b18d78de

+15 -4
+15 -4
fs/nilfs2/mdt.c
··· 399 399 return test_bit(NILFS_I_DIRTY, &ii->i_state); 400 400 } 401 401 402 - static int 403 - nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) 402 + static int nilfs_mdt_write_folio(struct folio *folio, 403 + struct writeback_control *wbc) 404 404 { 405 - struct folio *folio = page_folio(page); 406 405 struct inode *inode = folio->mapping->host; 407 406 struct super_block *sb; 408 407 int err = 0; ··· 434 435 return err; 435 436 } 436 437 438 + static int nilfs_mdt_writeback(struct address_space *mapping, 439 + struct writeback_control *wbc) 440 + { 441 + struct folio *folio = NULL; 442 + int error; 443 + 444 + while ((folio = writeback_iter(mapping, wbc, folio, &error))) 445 + error = nilfs_mdt_write_folio(folio, wbc); 446 + 447 + return error; 448 + } 437 449 438 450 static const struct address_space_operations def_mdt_aops = { 439 451 .dirty_folio = block_dirty_folio, 440 452 .invalidate_folio = block_invalidate_folio, 441 - .writepage = nilfs_mdt_write_page, 453 + .writepages = nilfs_mdt_writeback, 454 + .migrate_folio = buffer_migrate_folio_norefs, 442 455 }; 443 456 444 457 static const struct inode_operations def_mdt_iops;