fs: Add helper functions for permanently empty directories.

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To ensure it is safe to mount proc and sysfs I need to check if
filesystems that are mounted on top of them are mounted on truly empty
directories.  Given that some directories can gain entries over time,
knowing that a directory is empty right now is insufficient.

Therefore add supporting infrastructure for permantently empty
directories that proc and sysfs can use when they create mount points
for filesystems and fs_fully_visible can use to test for permanently
empty directories to ensure that nothing will be gained by mounting a
fresh copy of proc or sysfs.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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Eric W. Biederman 2015-05-09 15:54:49 -05:00

parent ceeb0e5d39

commit fbabfd0f4e

2 changed files with 98 additions and 0 deletions

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96

fs/libfs.c

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2

include/linux/fs.h

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