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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-09-25 21:16:53 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2020-09-28 18:47:01 +0300 |
| commit | 4595a298d5563cf76c1d852970f162051fd1a7a6 (patch) | |
| tree | b2abc85f95dfbe458f4bd22572e62da773957238 | |
| parent | 81ee8e52a71c712dbe04994f1430cb4c88b87ad6 (diff) | |
| download | linux-4595a298d5563cf76c1d852970f162051fd1a7a6.tar.xz | |
iomap: Set all uptodate bits for an Uptodate page
For filesystems with block size < page size, we need to set all the
per-block uptodate bits if the page was already uptodate at the time
we create the per-block metadata. This can happen if the page is
invalidated (eg by a write to drop_caches) but ultimately not removed
from the page cache.
This is a data corruption issue as page writeback skips blocks which
are marked !uptodate.
Fixes: 9dc55f1389f9 ("iomap: add support for sub-pagesize buffered I/O without buffer heads")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reported-by: Qian Cai <cai@redhat.com>
Cc: Brian Foster <bfoster@redhat.com>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | fs/iomap/buffered-io.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 8b6cca7e34e4..8180061b9e16 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -60,6 +60,8 @@ iomap_page_create(struct inode *inode, struct page *page) iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), GFP_NOFS | __GFP_NOFAIL); spin_lock_init(&iop->uptodate_lock); + if (PageUptodate(page)) + bitmap_fill(iop->uptodate, nr_blocks); attach_page_private(page, iop); return iop; } |