e2fsprogs: ensure small images have 256-byte inodes

e2fsprogs calls filesystems larger than 3MB but smaller than 512MB
"small", which has some implications:

- blocksize 1024 instead of 4096
- inode_ratio 4096 instead of 16384
- inode_size 128 instead of 256

The outcome of the inode size dropping to 128 bytes is that they cannot
store 64-bit timestamps, so are not Y2038-safe.

A previous attempt to solve this problem[1] changed some of the canned
wic files to pass -T default to mkfs.ext4, but this only covered wic
images and not traditional images.  Also, actually small filesystems,
for example a core-image-minimal, will happily be tens of megabytes and
with the "default" options will result in an image which runs out of
blocks before it runs out of space:

mkfs.ext4: Could not allocate block in ext2 filesystem while populating file system

Considering that many OpenEmbedded images are in fact "small", being
2038-safe is worth the marginal increase is disk usage.  This patch
alters the small configuration in native builds so that it also has
256-byte inodes.  Target is unchanged so that standard behaviour is
maintained outside of the build.

This is actually the same underlying patch that Mathieu Dubois-Briand
sent in April, but the wic change in [1] was accepted instead. I believe
that is the wrong approach and this approach covers more cases.

[ YOCTO #14478 ]

[1] openembedded-core eecbe62
[2] https://lists.openembedded.org/g/openembedded-core/message/150298

(From OE-Core rev: 98fbb9452aa762e61032a0836e5d732f206e3836)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 9ab0ae83a24ee99e69f8ac54256b253a122aef8a)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 23 insertions, 0 deletions

diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs/big-inodes-for-small-fs.patch b/meta/recipes-devtools/e2fsprogs/e2fsprogs/big-inodes-for-small-fs.patch
new file mode 100644
index 0000000000..caeb560d32
--- /dev/null
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs/big-inodes-for-small-fs.patch
@@ -0,0 +1,22 @@
+Ensure "small" file systems also have the default inode size (256 bytes) so that
+can store 64-bit timestamps and work past 2038.
+
+The "small" type is any size >3MB and <512MB, which covers a lot of relatively
+small filesystems built by OE, especially when they're sized to fit the contents
+and expand to the storage on boot.
+
+Upstream-Status: Inappropriate
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+diff --git a/misc/mke2fs.conf.in b/misc/mke2fs.conf.in
+index 01e35cf8..29f41dc0 100644
+--- a/misc/mke2fs.conf.in
++++ b/misc/mke2fs.conf.in
+@@ -16,7 +16,6 @@
+        }
+        small = {
+                blocksize = 1024
+-               inode_size = 128
+                inode_ratio = 4096
+        }
+        floppy = {
diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.45.4.bb b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.45.4.bb
index 439928e433..2eae9cd892 100644
--- a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.45.4.bb
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.45.4.bb
@@ -14,6 +14,7 @@ SRC_URI += "file://remove.ldconfig.call.patch \
 
 SRC_URI_append_class-native = " file://e2fsprogs-fix-missing-check-for-permission-denied.patch \
                                 file://quiet-debugfs.patch \
+                                file://big-inodes-for-small-fs.patch \
 "
 
 SRCREV = "984ff8d6a0a1d5dc300505f67b38ed5047d51dac"