From c114bbc6c423a449a00780d2d6633432c0a0505f Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Thu, 10 Sep 2020 08:26:16 -0700 Subject: iomap: Fix direct I/O write consistency check When a direct I/O write falls back to buffered I/O entirely, dio->size will be 0 in iomap_dio_complete. Function invalidate_inode_pages2_range will try to invalidate the rest of the address space. If there are any dirty pages in that range, the write will fail and a "Page cache invalidation failure on direct I/O" error will be logged. On gfs2, this can be reproduced as follows: xfs_io \ -c "open -ft foo" -c "pwrite 4k 4k" -c "close" \ -c "open -d foo" -c "pwrite 0 4k" Fix this by recognizing 0-length writes. Signed-off-by: Andreas Gruenbacher Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/iomap/direct-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/iomap') diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 9519113ebc35..024d4bb3028e 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -108,7 +108,7 @@ static ssize_t iomap_dio_complete(struct iomap_dio *dio) * ->end_io() when necessary, otherwise a racing buffer read would cache * zeros from unwritten extents. */ - if (!dio->error && + if (!dio->error && dio->size && (dio->flags & IOMAP_DIO_WRITE) && inode->i_mapping->nrpages) { int err; err = invalidate_inode_pages2_range(inode->i_mapping, -- cgit v1.2.3