[PATCH] Revert "fs/ntfs3: Replace inode_trylock with inode_lock"

[Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>]

This reverts commit 69505fe98f198ee813898cbcaf6770949636430b.

Make lock acquiring conditional to avoid the deadlock.

Fixes: 69505fe98f19 ("fs/ntfs3: Replace inode_trylock with inode_lock")
Reported-by: syzbot+a5d1c9dfa91705cd2f6d@xxxxxxxxxxxxxxxxxxxxxxxxx
Suggested-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
---
 fs/ntfs3/file.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 65fb27d1e17c..2e321b84a1ed 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -322,7 +322,10 @@ 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);
-- 
2.43.0