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file_modified() must be called with inode lock held. fuse_fallocate()
didn't lock the inode in case of just FALLOC_KEEP_SIZE flags value, which
resulted in a kernel Warning in notify_change().
Lock the inode unconditionally, like all other fallocate implementations
do.
Reported-by: Pengfei Xu <pengfei.xu@intel.com>
Reported-and-tested-by: syzbot+462da39f0667b357c4b6@syzkaller.appspotmail.com
Fixes: 4a6f278d4827 ("fuse: add file_modified() to fallocate")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>