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When creating a filesystem, mkfs.ext will chose the inode size depending
on the size of the filesystem. Small filesystem get 128-bytes inodes,
while bigger filesystems use 256-byte inodes (inode must be a power of 2
larger or equal to 128, and smaller or equal to the blocksize).
However, 128-byte inodes can't store timestamps past the dreaded
2038-01-19 03:14:07Z deadline, while inodes larger than or equal to 256
do not have the issue.
It turns out that the tipping point to decide whether a filesystem is
small or big, is about around the size of the filesystems we generate
for our runtime tests. This causes the kernel to emit warning like:
ext2 filesystem being remounted at / supports timestamps until 2038 (0x7fffffff)
We add a new option to our ext2 filesystem, so that user can specify the
size of the inode. That new option defaults to 256 to be resilient to
the Y2K38 problem.
Note: it was already possible for users to explicitly pass the -I
option, through BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS. We could have
chosen to extend the existing value with a -I 256, but that is not
satisfactory. Indeed, we do want to ensure that the default is now
Y2K38-OK, even for existing configurations that did not have explicit
setting.
We also pass that new option before the user-specified arbitrary ones,
so that BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS still wins (in case -I was
set there).
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
[Peter: tweak help text]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
48 lines
1.5 KiB
Makefile
48 lines
1.5 KiB
Makefile
################################################################################
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#
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# Build the ext2 root filesystem image
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#
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################################################################################
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ROOTFS_EXT2_SIZE = $(call qstrip,$(BR2_TARGET_ROOTFS_EXT2_SIZE))
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ifeq ($(BR2_TARGET_ROOTFS_EXT2)-$(ROOTFS_EXT2_SIZE),y-)
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$(error BR2_TARGET_ROOTFS_EXT2_SIZE cannot be empty)
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endif
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ROOTFS_EXT2_MKFS_OPTS = $(call qstrip,$(BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS))
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# qstrip results in stripping consecutive spaces into a single one. So the
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# variable is not qstrip-ed to preserve the integrity of the string value.
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ROOTFS_EXT2_LABEL = $(subst ",,$(BR2_TARGET_ROOTFS_EXT2_LABEL))
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#" Syntax highlighting... :-/ )
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ROOTFS_EXT2_OPTS = \
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-d $(TARGET_DIR) \
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-r $(BR2_TARGET_ROOTFS_EXT2_REV) \
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-N $(BR2_TARGET_ROOTFS_EXT2_INODES) \
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-m $(BR2_TARGET_ROOTFS_EXT2_RESBLKS) \
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-L "$(ROOTFS_EXT2_LABEL)" \
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-I $(BR2_TARGET_ROOTFS_EXT2_INODE_SIZE) \
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$(ROOTFS_EXT2_MKFS_OPTS)
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ROOTFS_EXT2_DEPENDENCIES = host-e2fsprogs
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define ROOTFS_EXT2_CMD
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rm -f $@
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$(HOST_DIR)/sbin/mkfs.ext$(BR2_TARGET_ROOTFS_EXT2_GEN) $(ROOTFS_EXT2_OPTS) $@ \
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"$(ROOTFS_EXT2_SIZE)" \
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|| { ret=$$?; \
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echo "*** Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)" 1>&2; \
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exit $$ret; \
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}
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endef
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ifneq ($(BR2_TARGET_ROOTFS_EXT2_GEN),2)
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define ROOTFS_EXT2_SYMLINK
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ln -sf rootfs.ext2$(ROOTFS_EXT2_COMPRESS_EXT) $(BINARIES_DIR)/rootfs.ext$(BR2_TARGET_ROOTFS_EXT2_GEN)$(ROOTFS_EXT2_COMPRESS_EXT)
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endef
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ROOTFS_EXT2_POST_GEN_HOOKS += ROOTFS_EXT2_SYMLINK
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endif
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$(eval $(rootfs))
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