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authorMatthew Wilcox (Oracle) <willy@infradead.org>2024-02-15 09:36:43 +0300
committerAndrew Morton <akpm@linux-foundation.org>2024-02-24 04:48:36 +0300
commit751e0d559c62a87dc828af22c3c58dc078c734e3 (patch)
tree532b088cc1f4e64212b9ffdb389e35efc2a254d7 /mm/page-writeback.c
parentb1793929b7dc17842a5e4377796b005d3efd61bc (diff)
downloadlinux-751e0d559c62a87dc828af22c3c58dc078c734e3.tar.xz
writeback: factor writeback_get_batch() out of write_cache_pages()
This simple helper will be the basis of the writeback iterator. To make this work, we need to remember the current index and end positions in writeback_control. [hch@lst.de: heavily rebased, add helpers to get the tag and end index, don't keep the end index in struct writeback_control] Link: https://lkml.kernel.org/r/20240215063649.2164017-9-hch@lst.de Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: Dave Chinner <dchinner@redhat.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c60
1 files changed, 38 insertions, 22 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 4bc55ce9597d..5b8dbbef7137 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2392,6 +2392,29 @@ static bool folio_prepare_writeback(struct address_space *mapping,
return true;
}
+static xa_mark_t wbc_to_tag(struct writeback_control *wbc)
+{
+ if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
+ return PAGECACHE_TAG_TOWRITE;
+ return PAGECACHE_TAG_DIRTY;
+}
+
+static pgoff_t wbc_end(struct writeback_control *wbc)
+{
+ if (wbc->range_cyclic)
+ return -1;
+ return wbc->range_end >> PAGE_SHIFT;
+}
+
+static void writeback_get_batch(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ folio_batch_release(&wbc->fbatch);
+ cond_resched();
+ filemap_get_folios_tag(mapping, &wbc->index, wbc_end(wbc),
+ wbc_to_tag(wbc), &wbc->fbatch);
+}
+
/**
* write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
* @mapping: address space structure to write
@@ -2429,38 +2452,32 @@ int write_cache_pages(struct address_space *mapping,
{
int ret = 0;
int error;
- struct folio_batch fbatch;
struct folio *folio;
- int nr_folios;
- pgoff_t index;
pgoff_t end; /* Inclusive */
- xa_mark_t tag;
- folio_batch_init(&fbatch);
if (wbc->range_cyclic) {
- index = mapping->writeback_index; /* prev offset */
+ wbc->index = mapping->writeback_index; /* prev offset */
end = -1;
} else {
- index = wbc->range_start >> PAGE_SHIFT;
+ wbc->index = wbc->range_start >> PAGE_SHIFT;
end = wbc->range_end >> PAGE_SHIFT;
}
- if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
- tag_pages_for_writeback(mapping, index, end);
- tag = PAGECACHE_TAG_TOWRITE;
- } else {
- tag = PAGECACHE_TAG_DIRTY;
- }
- while (index <= end) {
+ if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
+ tag_pages_for_writeback(mapping, wbc->index, end);
+
+ folio_batch_init(&wbc->fbatch);
+
+ while (wbc->index <= end) {
int i;
- nr_folios = filemap_get_folios_tag(mapping, &index, end,
- tag, &fbatch);
+ writeback_get_batch(mapping, wbc);
- if (nr_folios == 0)
+ if (wbc->fbatch.nr == 0)
break;
- for (i = 0; i < nr_folios; i++) {
- folio = fbatch.folios[i];
+ for (i = 0; i < wbc->fbatch.nr; i++) {
+ folio = wbc->fbatch.folios[i];
+
folio_lock(folio);
if (!folio_prepare_writeback(mapping, wbc, folio)) {
folio_unlock(folio);
@@ -2498,8 +2515,6 @@ int write_cache_pages(struct address_space *mapping,
goto done;
}
}
- folio_batch_release(&fbatch);
- cond_resched();
}
/*
@@ -2512,6 +2527,7 @@ int write_cache_pages(struct address_space *mapping,
* of the file if we are called again, which can only happen due to
* -ENOMEM from the file system.
*/
+ folio_batch_release(&wbc->fbatch);
if (wbc->range_cyclic)
mapping->writeback_index = 0;
return ret;
@@ -2519,7 +2535,7 @@ int write_cache_pages(struct address_space *mapping,
done:
if (wbc->range_cyclic)
mapping->writeback_index = folio->index + folio_nr_pages(folio);
- folio_batch_release(&fbatch);
+ folio_batch_release(&wbc->fbatch);
return error;
}
EXPORT_SYMBOL(write_cache_pages);