On Tue, Jun 18, 2024 at 8:57 AM Barry Song 21cnbao@gmail.com wrote:
From: Christoph Hellwig hch@lst.de
Since commit 2282679fb20b ("mm: submit multipage write for SWP_FS_OPS swap-space"), we can plug multiple pages then unplug them all together. That means iov_iter_count(iter) could be way bigger than PAGE_SIZE, it actually equals the size of iov_iter_npages(iter, INT_MAX).
Note this issue has nothing to do with large folios as we don't support THP_SWPOUT to non-block devices.
Fixes: 2282679fb20b ("mm: submit multipage write for SWP_FS_OPS swap-space") Reported-by: Christoph Hellwig hch@lst.de Closes: https://lore.kernel.org/linux-mm/20240617053201.GA16852@lst.de/ Cc: NeilBrown neilb@suse.de Cc: Anna Schumaker anna@kernel.org Cc: Steve French sfrench@samba.org Cc: Trond Myklebust trondmy@kernel.org Cc: Chuanhua Han hanchuanhua@oppo.com Cc: Ryan Roberts ryan.roberts@arm.com Cc: Chris Li chrisl@kernel.org Cc: "Huang, Ying" ying.huang@intel.com Cc: Jeff Layton jlayton@kernel.org Cc: stable@vger.kernel.org Cc: Matthew Wilcox willy@infradead.org Cc: Martin Wege martin.l.wege@gmail.com Signed-off-by: Christoph Hellwig hch@lst.de [Barry: figure out the cause and correct the commit message] Signed-off-by: Barry Song v-songbaohua@oppo.com
fs/nfs/direct.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index bb2f583eb28b..90079ca134dd 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c
Please add a
Reviewed-by: Martin Wege martin.l.wege@gmail.com
Thanks, Martin