From: Barry Song v-songbaohua@oppo.com

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/20240614100329.1203579-1-hch@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: Paulo Alcantara pc@manguebit.com Cc: Ronnie Sahlberg ronniesahlberg@gmail.com Cc: Shyam Prasad N sprasad@microsoft.com Cc: Tom Talpey tom@talpey.com Cc: Bharath SM bharathsm@microsoft.com Cc: stable@vger.kernel.org Signed-off-by: Barry Song v-songbaohua@oppo.com --- -v2: * drop the assertion instead of fixing the assertion. per the comments of Willy, Christoph in nfs thread.

fs/smb/client/file.c | 2 -- 1 file changed, 2 deletions(-)

diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index 9d5c2440abfc..1e269e0bc75b 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -3200,8 +3200,6 @@ static int cifs_swap_rw(struct kiocb *iocb, struct iov_iter *iter) { ssize_t ret;

- WARN_ON_ONCE(iov_iter_count(iter) != PAGE_SIZE); - if (iov_iter_rw(iter) == READ) ret = netfs_unbuffered_read_iter_locked(iocb, iter); else