Patch "nilfs2: replace WARN_ONs for invalid DAT metadata block requests" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    nilfs2: replace WARN_ONs for invalid DAT metadata block requests

to the 6.1-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:
     nilfs2-replace-warn_ons-for-invalid-dat-metadata-block-requests.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5124a0a549857c4b87173280e192eea24dea72ad Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Date: Fri, 27 Jan 2023 01:41:14 +0900
Subject: nilfs2: replace WARN_ONs for invalid DAT metadata block requests

From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>

commit 5124a0a549857c4b87173280e192eea24dea72ad upstream.

If DAT metadata file block access fails due to corruption of the DAT file
or abnormal virtual block numbers held by b-trees or inodes, a kernel
warning is generated.

This replaces the WARN_ONs by error output, so that a kernel, booted with
panic_on_warn, does not panic.  This patch also replaces the detected
return code -ENOENT with another internal code -EINVAL to notify the bmap
layer of metadata corruption.  When the bmap layer sees -EINVAL, it
handles the abnormal situation with nilfs_bmap_convert_error() and finally
returns code -EIO as it should.

Link: https://lkml.kernel.org/r/0000000000005cc3d205ea23ddcf@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20230126164114.6911-1-konishi.ryusuke@xxxxxxxxx
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Reported-by: <syzbot+5d5d25f90f195a3cfcb4@xxxxxxxxxxxxxxxxxxxxxxxxx>
Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nilfs2/dat.c |   27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -40,8 +40,21 @@ static inline struct nilfs_dat_info *NIL
 static int nilfs_dat_prepare_entry(struct inode *dat,
 				   struct nilfs_palloc_req *req, int create)
 {
-	return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
-					    create, &req->pr_entry_bh);
+	int ret;
+
+	ret = nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
+					   create, &req->pr_entry_bh);
+	if (unlikely(ret == -ENOENT)) {
+		nilfs_err(dat->i_sb,
+			  "DAT doesn't have a block to manage vblocknr = %llu",
+			  (unsigned long long)req->pr_entry_nr);
+		/*
+		 * Return internal code -EINVAL to notify bmap layer of
+		 * metadata corruption.
+		 */
+		ret = -EINVAL;
+	}
+	return ret;
 }
 
 static void nilfs_dat_commit_entry(struct inode *dat,
@@ -123,11 +136,7 @@ static void nilfs_dat_commit_free(struct
 
 int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
 {
-	int ret;
-
-	ret = nilfs_dat_prepare_entry(dat, req, 0);
-	WARN_ON(ret == -ENOENT);
-	return ret;
+	return nilfs_dat_prepare_entry(dat, req, 0);
 }
 
 void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
@@ -154,10 +163,8 @@ int nilfs_dat_prepare_end(struct inode *
 	int ret;
 
 	ret = nilfs_dat_prepare_entry(dat, req, 0);
-	if (ret < 0) {
-		WARN_ON(ret == -ENOENT);
+	if (ret < 0)
 		return ret;
-	}
 
 	kaddr = kmap_atomic(req->pr_entry_bh->b_page);
 	entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,


Patches currently in stable-queue which might be from konishi.ryusuke@xxxxxxxxx are

queue-6.1/nilfs2-fix-potential-bug-in-end_buffer_async_write.patch
queue-6.1/nilfs2-fix-data-corruption-in-dsync-block-recovery-for-small-block-sizes.patch
queue-6.1/nilfs2-fix-hang-in-nilfs_lookup_dirty_data_buffers.patch
queue-6.1/nilfs2-replace-warn_ons-for-invalid-dat-metadata-block-requests.patch




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