releases/5.15.154/fuse-don-t-unhash-root.patch

   1 From cb3e68017eeab61358f6313a558d774e2f490d19 Mon Sep 17 00:00:00 2001
   2 From: Sasha Levin <sashal@kernel.org>
   3 Date: Wed, 28 Feb 2024 16:50:49 +0100
   4 Subject: fuse: don't unhash root
   5
   6 From: Miklos Szeredi <mszeredi@redhat.com>
   7
   8 [ Upstream commit b1fe686a765e6c0d71811d825b5a1585a202b777 ]
   9
  10 The root inode is assumed to be always hashed.  Do not unhash the root
  11 inode even if it is marked BAD.
  12
  13 Fixes: 5d069dbe8aaf ("fuse: fix bad inode")
  14 Cc: <stable@vger.kernel.org> # v5.11
  15 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
  16 Signed-off-by: Sasha Levin <sashal@kernel.org>
  17 ---
  18  fs/fuse/fuse_i.h | 1 -
  19  fs/fuse/inode.c  | 7 +++++--
  20  2 files changed, 5 insertions(+), 3 deletions(-)
  21
  22 diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
  23 index 4b8f094345e12..55b7ca26fb8ab 100644
  24 --- a/fs/fuse/fuse_i.h
  25 +++ b/fs/fuse/fuse_i.h
  26 @@ -899,7 +899,6 @@ static inline bool fuse_stale_inode(const struct inode *inode, int generation,
  27
  28  static inline void fuse_make_bad(struct inode *inode)
  29  {
  30 -       remove_inode_hash(inode);
  31         set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
  32  }
  33
  34 diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
  35 index 97dc24557bf24..62b4143ccf26c 100644
  36 --- a/fs/fuse/inode.c
  37 +++ b/fs/fuse/inode.c
  38 @@ -413,8 +413,11 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
  39         } else if (fuse_stale_inode(inode, generation, attr)) {
  40                 /* nodeid was reused, any I/O on the old inode should fail */
  41                 fuse_make_bad(inode);
  42 -               iput(inode);
  43 -               goto retry;
  44 +               if (inode != d_inode(sb->s_root)) {
  45 +                       remove_inode_hash(inode);
  46 +                       iput(inode);
  47 +                       goto retry;
  48 +               }
  49         }
  50         fi = get_fuse_inode(inode);
  51         spin_lock(&fi->lock);
  52 --
  53 2.43.0
  54