This is a note to let you know that I've just added the patch titled
NFSD: Protect against filesystem freezing
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-protect-against-filesystem-freezing.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 33403aa7da58382c46db95e86a033baacb4ed44d
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Mon Mar 6 10:43:47 2023 -0500
NFSD: Protect against filesystem freezing
[ Upstream commit fd9a2e1d513823e840960cb3bc26d8b7749d4ac2 ]
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: <flole@xxxxxxxx>
Suggested-by: Jan Kara <jack@xxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217123
Fixes: 73da852e3831 ("nfsd: use vfs_iter_read/write")
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index db7f0119433cf..690191b3d997c 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1101,7 +1101,9 @@ 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);
