CONFIG_TMPFS_INODE64: Use 64-bit ino_t by default in tmpfs

General informations

The Linux kernel configuration item CONFIG_TMPFS_INODE64:

• prompt: Use 64-bit ino_t by default in tmpfs
• type: bool
• depends on: CONFIG_TMPFS && CONFIG_64BIT
• defined in fs/Kconfig
• found in Linux kernels: 5.9–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

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, without needing to specify the inode64 option when mounting.

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.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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