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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>
155 lines
3.9 KiB
Plaintext
155 lines
3.9 KiB
Plaintext
config BR2_TARGET_ROOTFS_EXT2
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bool "ext2/3/4 root filesystem"
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select BR2_PACKAGE_HOST_E2FSPROGS
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help
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Build an ext2/3/4 root filesystem
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if BR2_TARGET_ROOTFS_EXT2
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config BR2_TARGET_ROOTFS_EXT2_2
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bool
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choice
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bool "ext2/3/4 variant"
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default BR2_TARGET_ROOTFS_EXT2_2r1
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config BR2_TARGET_ROOTFS_EXT2_2r0
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bool "ext2 (rev0)"
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select BR2_TARGET_ROOTFS_EXT2_2
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config BR2_TARGET_ROOTFS_EXT2_2r1
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bool "ext2 (rev1)"
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select BR2_TARGET_ROOTFS_EXT2_2
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config BR2_TARGET_ROOTFS_EXT2_3
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bool "ext3"
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config BR2_TARGET_ROOTFS_EXT2_4
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bool "ext4"
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endchoice
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config BR2_TARGET_ROOTFS_EXT2_GEN
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int
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default 2 if BR2_TARGET_ROOTFS_EXT2_2
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default 3 if BR2_TARGET_ROOTFS_EXT2_3
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default 4 if BR2_TARGET_ROOTFS_EXT2_4
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# All ext generations are revision 1, except ext2r0, which is revision 0
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config BR2_TARGET_ROOTFS_EXT2_REV
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int
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default 0 if BR2_TARGET_ROOTFS_EXT2_2r0
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default 1 if !BR2_TARGET_ROOTFS_EXT2_2r0
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config BR2_TARGET_ROOTFS_EXT2_LABEL
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string "filesystem label"
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default "rootfs"
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config BR2_TARGET_ROOTFS_EXT2_SIZE
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string "exact size"
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default BR2_TARGET_ROOTFS_EXT2_BLOCKS if BR2_TARGET_ROOTFS_EXT2_BLOCKS_WRAP # legacy 2017.08
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default "60M"
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help
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The size of the filesystem image. If it does not have a
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suffix, it is interpreted as power-of-two kilobytes. If it is
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suffixed by 'k', 'm', 'g', 't' (either upper-case or
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lower-case), then it is interpreted in power-of-two kilobytes,
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megabytes, gigabytes, terabytes, etc.
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config BR2_TARGET_ROOTFS_EXT2_INODES
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int "exact number of inodes (leave at 0 for auto calculation)"
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default 0
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config BR2_TARGET_ROOTFS_EXT2_INODE_SIZE
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int "inode size"
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default 256
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help
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Set the size of inodes, in bytes, as a power of 2 larger or
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equal to 128.
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Set to 0 to let the filesystem generator decide based on the
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file system size. If unsure, keep the default, 256.
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Note: 128-byte inodes suffer of the Y2K38 problem, and can't
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store timestamps beyond 2038-01-19 03:14:07Z.
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config BR2_TARGET_ROOTFS_EXT2_RESBLKS
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int "reserved blocks percentage"
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default 5
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help
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The number of blocks on the filesystem (as a percentage of the
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total number of blocks), that are reserved for use by root.
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Traditionally, this has been 5%, and all ext-related tools
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still default to reserving 5% when creating a new ext
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filesystem.
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config BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS
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string "additional mke2fs options"
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default "-O ^64bit"
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help
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Specify a space-separated list of mke2fs options, including
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any ext2/3/4 filesystem features.
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For more information about the mke2fs options, see the manual
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page mke2fs(8).
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For more information about the ext2/3/4 features which can be
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set, see the manual page ext4(5).
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The default is "-O ^64bit", i.e. disable 64-bit filesystem
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support. This default value has been chosen because U-Boot
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versions before 2017.02 don't support this filesystem
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option: using it may make the filesystem unreadable by
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U-Boot.
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choice
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prompt "Compression method"
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default BR2_TARGET_ROOTFS_EXT2_NONE
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help
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Select compressor for ext2/3/4 filesystem of the root
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filesystem
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config BR2_TARGET_ROOTFS_EXT2_NONE
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bool "no compression"
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help
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Do not compress the ext2/3/4 filesystem.
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config BR2_TARGET_ROOTFS_EXT2_GZIP
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bool "gzip"
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help
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Do compress the ext2/3/4 filesystem with gzip.
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config BR2_TARGET_ROOTFS_EXT2_BZIP2
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bool "bzip2"
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help
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Do compress the ext2/3/4 filesystem with bzip2.
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config BR2_TARGET_ROOTFS_EXT2_LZ4
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bool "lz4"
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help
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Do compress the ext2 filesystem with lz4.
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config BR2_TARGET_ROOTFS_EXT2_LZMA
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bool "lzma"
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help
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Do compress the ext2/3/4 filesystem with lzma.
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config BR2_TARGET_ROOTFS_EXT2_LZO
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bool "lzo"
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help
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Do compress the ext2 filesystem with lzop.
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config BR2_TARGET_ROOTFS_EXT2_XZ
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bool "xz"
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help
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Do compress the ext2 filesystem with xz.
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config BR2_TARGET_ROOTFS_EXT2_ZSTD
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bool "zstd"
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help
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Do compress the ext2 filesystem with zstd.
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endchoice
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endif # BR2_TARGET_ROOTFS_EXT2
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