From: Chi Zhiling Date: Mon, 11 May 2026 09:40:07 +0000 (+0800) Subject: iomap: add dirty page control to iomap_zero_iter X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=ecf22101ba7a398eb1aefbb4eaba5fdddf7b08e4;p=thirdparty%2Fkernel%2Flinux.git iomap: add dirty page control to iomap_zero_iter This patch prepares the iomap framework for exFAT's upcoming migration to iomap. During testing of the exFAT iomap branch with xfstests generic/299 on a VM with 8GB RAM and a 40GB disk, system unresponsiveness was observed. iomap_zero_iter() lacked dirty page throttling, which could cause memory pressure when exFAT's valid_size mechanism triggers large-scale zeroing operations during writes beyond valid_size. Align iomap_zero_iter() with iomap_write_iter() by adding balance_dirty_pages_ratelimited() to throttle dirty page generation during large zeroing operations Signed-off-by: Chi Zhiling Link: https://patch.msgid.link/20260511094007.728011-1-chizhiling@163.com Reviewed-by: Christoph Hellwig Cc: Namjae Jeon Signed-off-by: Christian Brauner --- diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index d7b648421a70f..437a7c527c4a4 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1543,6 +1543,8 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero, size_t offset; bool ret; + balance_dirty_pages_ratelimited(iter->inode->i_mapping); + bytes = min_t(u64, SIZE_MAX, bytes); status = iomap_write_begin(iter, write_ops, &folio, &offset, &bytes);