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proc: Allow creating permanently empty directories that serve as mount points

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Add a new function proc_create_mount_point that when used to creates a
directory that can not be added to.

Add a new function is_empty_pde to test if a function is a mount
point.

Update the code to use make_empty_dir_inode when reporting
a permanently empty directory to the vfs.

Update the code to not allow adding to permanently empty directories.

Update /proc/openprom and /proc/fs/nfsd to be permanently empty directories.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2015-05-11 16:44:25 -05:00
parent f9bd6733d3
commit eb6d38d542
4 changed files with 35 additions and 2 deletions
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4
fs/proc/root.c
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@@ -179,10 +179,10 @@ void __init proc_root_init(void)
#endif
proc_mkdir("fs", NULL);
proc_mkdir("driver", NULL);
proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
proc_create_mount_point("fs/nfsd"); /* somewhere for the nfsd filesystem to be mounted */
#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
/* just give it a mountpoint */
proc_mkdir("openprom", NULL);
proc_create_mount_point("openprom");
#endif
proc_tty_init();
proc_mkdir("bus", NULL);