0aade4df1f
This patch makes it possible to format the rootfs using btrfs. It
introduces the option; BR2_TARGET_ROOTFS_BTRFS.
When selected, the user is able to specify the filesystem size, label,
options, and node and sector sizes. The new files are based on
fs/ext2/{Config.in,ext2.mk}
Signed-off-by: Robert J. Heywood <robert.heywood@codethink.co.uk>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[Thomas:
- fix issues pointed by Yann (duplicated empty line, missing quotes
around default values for string options)
- use -f option so that we don't have to remove the image file before
creating it again
- use the --byte-count option to set the filesystem size, which
avoids the need for doing a "truncate -s"
- remove the possible explanation of a mkfs.btrfs error. Indeed,
mkfs.btrfs automatically extends the size of the image as needed,
so the size passed can never be "too small".
- fix check-package warnings in Config.in file.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
config BR2_TARGET_ROOTFS_BTRFS
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bool "btrfs root filesystem"
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select BR2_PACKAGE_HOST_BTRFS_PROGS
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help
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Build a btrfs root filesystem. If you enable this option, you
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probably want to enable the btrfs-progs package too.
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if BR2_TARGET_ROOTFS_BTRFS
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config BR2_TARGET_ROOTFS_BTRFS_LABEL
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string "filesystem label"
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config BR2_TARGET_ROOTFS_BTRFS_SIZE
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string "filesystem size"
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default "100m"
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help
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The size of the filesystem image in bytes.
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Suffix with k, m, g or t for power-of-two kilo-, mega-, giga-
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or terabytes.
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config BR2_TARGET_ROOTFS_BTRFS_SIZE_SECTOR
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string "sector size"
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default "4096"
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help
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This value should be set to the page size in bytes. The
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default value of 4096 is the the most common page size for
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most systems. If the sectorsize differs from the page size,
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the created filesystem may not be mountable by the kernel.
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Therefore it is recommended to leave this value at
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4096. Unless you know that your kernel uses a different page
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size. Suffix with k for power-of-two kilobytes.
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config BR2_TARGET_ROOTFS_BTRFS_SIZE_NODE
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string "btree node size"
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default "16384"
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help
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The tree block size in which btrfs stores metadata in bytes.
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This must be a multiple of the sectorsize, but not larger
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than 64KiB (65536).
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Suffix with k for power-of-two kilobytes.
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config BR2_TARGET_ROOTFS_BTRFS_FEATURES
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string "Filesystem Features"
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help
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A comma separated string of features that can be enabled
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during creation time.
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For a list of available options, use:
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`.../host/bin/mkfs.btrfs -O list-all`
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endif # BR2_TARGET_ROOTFS_BTRFS
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