diff mbox series

[3/3] filemap: Update the folio_mark_dirty documentation

Message ID 20220508203048.667631-4-willy@infradead.org (mailing list archive)
State New, archived
Headers show
Series Appoint myself page cache maintainer | expand

Commit Message

Matthew Wilcox May 8, 2022, 8:30 p.m. UTC 
The previous comment was not terribly helpful.  Be a bit more explicit
about the necessary locking environment.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/page-writeback.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
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Patch

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 7e2da284e427..fa1117db4610 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2602,10 +2602,12 @@  EXPORT_SYMBOL(folio_redirty_for_writepage);
  * folio_mark_dirty - Mark a folio as being modified.
  * @folio: The folio.
  *
- * For folios with a mapping this should be done with the folio lock held
- * for the benefit of asynchronous memory errors who prefer a consistent
- * dirty state. This rule can be broken in some special cases,
- * but should be better not to.
+ * The folio may not be truncated while this function is running.
+ * Holding the folio lock is sufficient to prevent truncation, but some
+ * callers cannot acquire a sleeping lock.  These callers instead hold
+ * the page table lock for a page table which contains at least one page
+ * in this folio.  Truncation will block on the page table lock as it
+ * unmaps pages before removing the folio from its mapping.
  *
  * Return: True if the folio was newly dirtied, false if it was already dirty.
  */