The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x f4ce24f54d9cca4f09a395f3eecce20d6bec4663 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023051540-afterlife-impeding-8523@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

f4ce24f54d9c ("ext4: fix deadlock when converting an inline directory in nojournal mode") f036adb39976 ("ext4: rename "dirent_csum" functions to use "dirblock"") b886ee3e778e ("ext4: Support case-insensitive file name lookups")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f4ce24f54d9cca4f09a395f3eecce20d6bec4663 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o tytso@mit.edu Date: Sat, 6 May 2023 21:04:01 -0400 Subject: [PATCH] ext4: fix deadlock when converting an inline directory in nojournal mode

In no journal mode, ext4_finish_convert_inline_dir() can self-deadlock by calling ext4_handle_dirty_dirblock() when it already has taken the directory lock. There is a similar self-deadlock in ext4_incvert_inline_data_nolock() for data files which we'll fix at the same time.

A simple reproducer demonstrating the problem:

mke2fs -Fq -t ext2 -O inline_data -b 4k /dev/vdc 64 mount -t ext4 -o dirsync /dev/vdc /vdc cd /vdc mkdir file0 cd file0 touch file0 touch file1 attr -s BurnSpaceInEA -V abcde . touch supercalifragilisticexpialidocious

Cc: stable@kernel.org Link: https://lore.kernel.org/r/20230507021608.1290720-1-tytso@mit.edu Reported-by: syzbot+91dccab7c64e2850a4e5@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=ba84cc80a9491d65416bc7877e1650c87530fe8... Signed-off-by: Theodore Ts'o tytso@mit.edu

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 859bc4e2c9b0..d3dfc51a43c5 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -1175,6 +1175,7 @@ static int ext4_finish_convert_inline_dir(handle_t *handle, ext4_initialize_dirent_tail(dir_block, inode->i_sb->s_blocksize); set_buffer_uptodate(dir_block); + unlock_buffer(dir_block); err = ext4_handle_dirty_dirblock(handle, inode, dir_block); if (err) return err; @@ -1249,6 +1250,7 @@ static int ext4_convert_inline_data_nolock(handle_t *handle, if (!S_ISDIR(inode->i_mode)) { memcpy(data_bh->b_data, buf, inline_size); set_buffer_uptodate(data_bh); + unlock_buffer(data_bh); error = ext4_handle_dirty_metadata(handle, inode, data_bh); } else { @@ -1256,7 +1258,6 @@ static int ext4_convert_inline_data_nolock(handle_t *handle, buf, inline_size); }

- unlock_buffer(data_bh); out_restore: if (error) ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);