proc: move fs/proc/inode-alloc.txt comment into a source file

so that people will realize that it exists and can update it as needed.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 5d2989e9dcc1..8c68bbe2b61e 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -307,6 +307,21 @@ static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
 /*
  * Return an inode number between PROC_DYNAMIC_FIRST and
  * 0xffffffff, or zero on failure.
+ *
+ * Current inode allocations in the proc-fs (hex-numbers):
+ *
+ * 00000000             reserved
+ * 00000001-00000fff    static entries  (goners)
+ *      001             root-ino
+ *
+ * 00001000-00001fff    unused
+ * 0001xxxx-7fffxxxx    pid-dir entries for pid 1-7fff
+ * 80000000-efffffff    unused
+ * f0000000-ffffffff    dynamic entries
+ *
+ * Goal:
+ *      Once we split the thing into several virtual filesystems,
+ *      we will get rid of magical ranges (and this comment, BTW).
  */
 static unsigned int get_inode_number(void)
 {