[folded-merged] tmpfs-support-64-bit-inums-per-sb-fix.patch removed from -mm tree

[folded-merged] tmpfs-support-64-bit-inums-per-sb-fix.patch removed from -mm tree

[akpm]

The patch titled
     Subject: tmpfs: support 64-bit inums per-sb fix
has been removed from the -mm tree.  Its filename was
     tmpfs-support-64-bit-inums-per-sb-fix.patch

This patch was dropped because it was folded into tmpfs-support-64-bit-inums-per-sb.patch

------------------------------------------------------
From: Hugh Dickins <hughd@google.com>
Subject: tmpfs: support 64-bit inums per-sb fix

Expanded Chris's Documentation and Kconfig help on tmpfs inode64. 
TMPFS_INODE64 still there, still default N, but writing down its very
limited limitation does make me wonder again if we want the option.

Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008011928010.13320@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/filesystems/tmpfs.rst |   13 ++++++++++---
 fs/Kconfig                          |   16 +++++++++++-----
 2 files changed, 21 insertions(+), 8 deletions(-)

--- a/Documentation/filesystems/tmpfs.rst~tmpfs-support-64-bit-inums-per-sb-fix
+++ a/Documentation/filesystems/tmpfs.rst
@@ -153,11 +153,18 @@ parameters with chmod(1), chown(1) and c
 tmpfs has a mount option to select whether it will wrap at 32- or 64-bit inode
 numbers:
 
+=======   ========================
 inode64   Use 64-bit inode numbers
 inode32   Use 32-bit inode numbers
+=======   ========================
+
+On a 32-bit kernel, inode32 is implicit, and inode64 is refused at mount time.
+On a 64-bit kernel, CONFIG_TMPFS_INODE64 sets the default.  inode64 avoids the
+possibility of multiple files with the same inode number on a single device;
+but risks glibc failing with EOVERFLOW once 33-bit inode numbers are reached -
+if a long-lived tmpfs is accessed by 32-bit applications so ancient that
+opening a file larger than 2GiB fails with EINVAL.
 
-On 64-bit, the default is set by CONFIG_TMPFS_INODE64. On 32-bit, inode64 is
-not legal and will produce an error at mount time.
 
 So 'mount -t tmpfs -o size=10G,nr_inodes=10k,mode=700 tmpfs /mytmpfs'
 will give you tmpfs instance on /mytmpfs which can allocate 10GB
@@ -170,5 +177,5 @@ RAM/SWAP in 10240 inodes and it is only
    Hugh Dickins, 4 June 2007
 :Updated:
    KOSAKI Motohiro, 16 Mar 2010
-Updated:
+:Updated:
    Chris Down, 13 July 2020
--- a/fs/Kconfig~tmpfs-support-64-bit-inums-per-sb-fix
+++ a/fs/Kconfig
@@ -207,12 +207,18 @@ config TMPFS_INODE64
 	default n
 	help
 	  tmpfs has historically used only inode numbers as wide as an unsigned
-	  int. In some cases this can cause wraparound, potentially resulting in
-	  multiple files with the same inode number on a single device. This option
-	  makes tmpfs use the full width of ino_t by default, similarly to the
-	  inode64 mount option.
+	  int. In some cases this can cause wraparound, potentially resulting
+	  in multiple files with the same inode number on a single device. This
+	  option makes tmpfs use the full width of ino_t by default, without
+	  needing to specify the inode64 option when mounting.
 
-	  To override this default, use the inode32 or inode64 mount options.
+	  But if a long-lived tmpfs is to be accessed by 32-bit applications so
+	  ancient that opening a file larger than 2GiB fails with EINVAL, then
+	  the INODE64 config option and inode64 mount option risk operations
+	  failing with EOVERFLOW once 33-bit inode numbers are reached.
+
+	  To override this configured default, use the inode32 or inode64
+	  option when mounting.
 
 	  If unsure, say N.
 
_

Patches currently in -mm which might be from hughd@google.com are

tmpfs-support-64-bit-inums-per-sb.patch
mm-memcontrol-decouple-reference-counting-from-page-accounting-fix.patch
khugepaged-collapse_pte_mapped_thp-flush-the-right-range.patch
khugepaged-collapse_pte_mapped_thp-protect-the-pmd-lock.patch
khugepaged-retract_page_tables-remember-to-test-exit.patch
khugepaged-khugepaged_test_exit-check-mmget_still_valid.patch