On Wed, Feb 21, 2024 at 11:30 PM Greg Kroah-Hartman wrote:
5.4-stable review patch. If anyone has any objections, please let me know.
From: Ryusuke Konishi konishi.ryusuke@gmail.com
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@google.com Link: https://lkml.kernel.org/r/20230126164114.6911-1-konishi.ryusuke@gmail.com Signed-off-by: Ryusuke Konishi konishi.ryusuke@gmail.com Reported-by: syzbot+5d5d25f90f195a3cfcb4@syzkaller.appspotmail.com Tested-by: Ryusuke Konishi konishi.ryusuke@gmail.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
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_error(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,
Hi Greg,
Please drop this patch for 5.4 as well as the patch for 4.19. (same reason as the review comment for the 4.19 patch)
I will send an equivalent replacement patch.
Thanks, Ryusuke Konishi