From b0df249c20b683ee5e85a1c2c60e9c60d84f2b12 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 6 Mar 2023 10:43:47 -0500 Subject: [PATCH] NFSD: Protect against filesystem freezing [ Upstream commit 8e86b2fba0c96968c97d5e8c1922623ef6120ab6 ] Flole observes this WARNING on occasion: [1210423.486503] WARNING: CPU: 8 PID: 1524732 at fs/ext4/ext4_jbd2.c:75 ext4_journal_check_start+0x68/0xb0 Reported-by: Suggested-by: Jan Kara Link: https://bugzilla.kernel.org/show_bug.cgi?id=217123 Fixes: 459ceebfe186 ("nfsd: use vfs_iter_read/write") Reviewed-by: Jeff Layton Reviewed-by: Jan Kara Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/vfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 0d49c6bb22eb1..59f9a8cee012a 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1037,7 +1037,9 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, since = READ_ONCE(file->f_wb_err); if (verf) nfsd_copy_write_verifier(verf, nn); + file_start_write(file); host_err = vfs_iter_write(file, &iter, &pos, flags); + file_end_write(file); if (host_err < 0) { nfsd_reset_write_verifier(nn); trace_nfsd_writeverf_reset(nn, rqstp, host_err); -- 2.39.5