Revert "fs/ntfs3: Replace inode_trylock with inode_lock"

[ Upstream commit a49f0abd8959048af18c6c690b065eb0d65b2d21 ]

This reverts commit 69505fe98f198ee813898cbcaf6770949636430b.

Initially, conditional lock acquisition was removed to fix an xfstest bug
that was observed during internal testing. The deadlock reported by syzbot
is resolved by reintroducing conditional acquisition. The xfstest bug no
longer occurs on kernel version 6.16-rc1 during internal testing. I
assume that changes in other modules may have contributed to this.

Fixes: 69505fe98f19 ("fs/ntfs3: Replace inode_trylock with inode_lock")
Reported-by: syzbot+a91fcdbd2698f99db8f4@syzkaller.appspotmail.com
Suggested-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 748c4be912db56ea8002078b5d997ba78773f5a8..902dc8ba878ef8158005fcbcff563f38642164ef 100644 (file)
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -392,7 +392,10 @@ static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
                }
 
                if (ni->i_valid < to) {
-                       inode_lock(inode);
+                       if (!inode_trylock(inode)) {
+                               err = -EAGAIN;
+                               goto out;
+                       }
                        err = ntfs_extend_initialized_size(file, ni,
                                                           ni->i_valid, to);
                        inode_unlock(inode);