Commits on Sep 13, 2023

1. Resolve cgroup inode in fanotify as soon as possible …

   In cloudflare#264 we reduced
   the amount of syscalls, here we reorder them to get the inode first.
   
   Before:
   
   ```
   ivan@vm:~$ sudo strace -f -TT -e open_by_handle_at,newfstatat,readlinkat -p $(pidof ebpf_exporter)
   strace: Process 14153 attached with 11 threads
   [pid 14153] open_by_handle_at(7, {handle_bytes=8, handle_type=254, f_handle="\x36\x00\x00\x00\x00\x00\x00\x00"}, O_RDONLY) = 13 <0.000764>
   [pid 14153] readlinkat(AT_FDCWD, "/proc/self/fd/13", "/sys/fs/cgroup/system.slice", 128) = 27 <0.000815>
   [pid 14153] newfstatat(AT_FDCWD, "/sys/fs/cgroup/system.slice/systemd-resolved.service", {st_mode=S_IFDIR|0755, st_size=0, ...}, 0) = 0 <0.000839>
   ```
   
   After:
   
   ```
   ivan@vm:~$ sudo strace -f -TT -e open_by_handle_at,newfstatat,readlinkat -p $(pidof ebpf_exporter)
   strace: Process 13925 attached with 10 threads
   [pid 13931] open_by_handle_at(7, {handle_bytes=8, handle_type=254, f_handle="\x36\x00\x00\x00\x00\x00\x00\x00"}, O_RDONLY) = 13 <0.000700>
   [pid 13931] newfstatat(13, "systemd-resolved.service", {st_mode=S_IFDIR|0755, st_size=0, ...}, 0) = 0 <0.001069>
   [pid 13931] readlinkat(AT_FDCWD, "/proc/self/fd/13", "/sys/fs/cgroup/system.slice", 128) = 27 <0.000774>
   ```

   

   bobrik committed Sep 13, 2023
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