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Commit fd659fd6 authored by Eric Dumazet's avatar Eric Dumazet Committed by Al Viro
Browse files

fix f_count description in Documentation/filesystems/files.txt 



Documentation/filesystems/files.txt was not updated when
f_count became an atomic_long_t.
atomic_long_inc_not_zero() is now used instead of atomic_inc_not_zero()

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 1239f26c

Documentation/filesystems/files.txt

+3 −3
Original line number Diff line number Diff line
@@ -76,13 +76,13 @@ the fdtable structure - 
5. Handling of the file structures is special. Since the look-up

   of the fd (fget()/fget_light()) are lock-free, it is possible

   that look-up may race with the last put() operation on the

   file structure. This is avoided using atomic_inc_not_zero()

   file structure. This is avoided using atomic_long_inc_not_zero()

   on ->f_count :



	rcu_read_lock();

	file = fcheck_files(files, fd);

	if (file) {

		if (atomic_inc_not_zero(&file->f_count))

		if (atomic_long_inc_not_zero(&file->f_count))

			*fput_needed = 1;

		else

		/* Didn't get the reference, someone's freed */
@@ -92,7 +92,7 @@ the fdtable structure - 
	....

	return file;



   atomic_inc_not_zero() detects if refcounts is already zero or

   atomic_long_inc_not_zero() detects if refcounts is already zero or

   goes to zero during increment. If it does, we fail

   fget()/fget_light().