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iomap: Support large folios in invalidatepage 

If we're punching a hole in a large folio, we need to remove the
per-folio iomap data as the folio is about to be split and each page will
need its own.  If a dirty folio is only partially-uptodate, the iomap
data contains the information about which blocks cannot be written back,
so assert that a dirty folio is fully uptodate.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-01-13 10:48:49 -05:00
parent 589110e897
commit 60d8231089
1 changed files with 7 additions and 2 deletions
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9
fs/iomap/buffered-io.c
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@ -481,13 +481,18 @@ void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len)
trace_iomap_invalidatepage(folio->mapping->host, offset, len);
/*
* If we're invalidating the entire page, clear the dirty state from it
* and release it to avoid unnecessary buildup of the LRU.
* If we're invalidating the entire folio, clear the dirty state
* from it and release it to avoid unnecessary buildup of the LRU.
*/
if (offset == 0 && len == folio_size(folio)) {
WARN_ON_ONCE(folio_test_writeback(folio));
folio_cancel_dirty(folio);
iomap_page_release(folio);
} else if (folio_test_large(folio)) {
/* Must release the iop so the page can be split */
WARN_ON_ONCE(!folio_test_uptodate(folio) &&
folio_test_dirty(folio));
iomap_page_release(folio);
}
}
EXPORT_SYMBOL_GPL(iomap_invalidate_folio);