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200 lines
6.3 KiB
200 lines
6.3 KiB
3 years ago
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# SPDX-License-Identifier: GPL-2.0
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config AUFS_FS
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tristate "Aufs (Advanced multi layered unification filesystem) support"
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help
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Aufs is a stackable unification filesystem such as Unionfs,
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which unifies several directories and provides a merged single
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directory.
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In the early days, aufs was entirely re-designed and
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re-implemented Unionfs Version 1.x series. Introducing many
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original ideas, approaches and improvements, it becomes totally
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different from Unionfs while keeping the basic features.
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if AUFS_FS
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choice
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prompt "Maximum number of branches"
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default AUFS_BRANCH_MAX_127
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help
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Specifies the maximum number of branches (or member directories)
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in a single aufs. The larger value consumes more system
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resources and has a minor impact to performance.
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config AUFS_BRANCH_MAX_127
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bool "127"
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help
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Specifies the maximum number of branches (or member directories)
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in a single aufs. The larger value consumes more system
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resources and has a minor impact to performance.
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config AUFS_BRANCH_MAX_511
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bool "511"
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help
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Specifies the maximum number of branches (or member directories)
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in a single aufs. The larger value consumes more system
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resources and has a minor impact to performance.
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config AUFS_BRANCH_MAX_1023
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bool "1023"
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help
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Specifies the maximum number of branches (or member directories)
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in a single aufs. The larger value consumes more system
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resources and has a minor impact to performance.
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config AUFS_BRANCH_MAX_32767
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bool "32767"
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help
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Specifies the maximum number of branches (or member directories)
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in a single aufs. The larger value consumes more system
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resources and has a minor impact to performance.
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endchoice
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config AUFS_SBILIST
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bool
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depends on AUFS_MAGIC_SYSRQ || PROC_FS
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default y
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help
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Automatic configuration for internal use.
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When aufs supports Magic SysRq or /proc, enabled automatically.
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config AUFS_HNOTIFY
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bool "Detect direct branch access (bypassing aufs)"
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help
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If you want to modify files on branches directly, eg. bypassing aufs,
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and want aufs to detect the changes of them fully, then enable this
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option and use 'udba=notify' mount option.
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Currently there is only one available configuration, "fsnotify".
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It will have a negative impact to the performance.
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See detail in aufs.5.
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choice
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prompt "method" if AUFS_HNOTIFY
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default AUFS_HFSNOTIFY
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config AUFS_HFSNOTIFY
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bool "fsnotify"
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select FSNOTIFY
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endchoice
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config AUFS_EXPORT
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bool "NFS-exportable aufs"
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depends on EXPORTFS
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help
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If you want to export your mounted aufs via NFS, then enable this
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option. There are several requirements for this configuration.
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See detail in aufs.5.
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config AUFS_INO_T_64
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bool
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depends on AUFS_EXPORT
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depends on 64BIT && !(ALPHA || S390)
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default y
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help
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Automatic configuration for internal use.
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/* typedef unsigned long/int __kernel_ino_t */
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/* alpha and s390x are int */
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config AUFS_XATTR
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bool "support for XATTR/EA (including Security Labels)"
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help
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If your branch fs supports XATTR/EA and you want to make them
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available in aufs too, then enable this opsion and specify the
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branch attributes for EA.
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See detail in aufs.5.
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config AUFS_FHSM
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bool "File-based Hierarchical Storage Management"
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help
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Hierarchical Storage Management (or HSM) is a well-known feature
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in the storage world. Aufs provides this feature as file-based.
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with multiple branches.
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These multiple branches are prioritized, ie. the topmost one
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should be the fastest drive and be used heavily.
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config AUFS_RDU
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bool "Readdir in userspace"
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help
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Aufs has two methods to provide a merged view for a directory,
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by a user-space library and by kernel-space natively. The latter
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is always enabled but sometimes large and slow.
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If you enable this option, install the library in aufs2-util
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package, and set some environment variables for your readdir(3),
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then the work will be handled in user-space which generally
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shows better performance in most cases.
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See detail in aufs.5.
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config AUFS_DIRREN
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bool "Workaround for rename(2)-ing a directory"
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help
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By default, aufs returns EXDEV error in renameing a dir who has
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his child on the lower branch, since it is a bad idea to issue
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rename(2) internally for every lower branch. But user may not
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accept this behaviour. So here is a workaround to allow such
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rename(2) and store some extra infromation on the writable
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branch. Obviously this costs high (and I don't like it).
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To use this feature, you need to enable this configuration AND
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to specify the mount option `dirren.'
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See details in aufs.5 and the design documents.
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config AUFS_SHWH
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bool "Show whiteouts"
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help
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If you want to make the whiteouts in aufs visible, then enable
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this option and specify 'shwh' mount option. Although it may
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sounds like philosophy or something, but in technically it
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simply shows the name of whiteout with keeping its behaviour.
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config AUFS_BR_RAMFS
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bool "Ramfs (initramfs/rootfs) as an aufs branch"
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help
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If you want to use ramfs as an aufs branch fs, then enable this
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option. Generally tmpfs is recommended.
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Aufs prohibited them to be a branch fs by default, because
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initramfs becomes unusable after switch_root or something
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generally. If you sets initramfs as an aufs branch and boot your
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system by switch_root, you will meet a problem easily since the
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files in initramfs may be inaccessible.
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Unless you are going to use ramfs as an aufs branch fs without
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switch_root or something, leave it N.
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config AUFS_BR_FUSE
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bool "Fuse fs as an aufs branch"
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depends on FUSE_FS
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select AUFS_POLL
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help
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If you want to use fuse-based userspace filesystem as an aufs
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branch fs, then enable this option.
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It implements the internal poll(2) operation which is
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implemented by fuse only (curretnly).
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config AUFS_POLL
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bool
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help
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Automatic configuration for internal use.
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config AUFS_BR_HFSPLUS
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bool "Hfsplus as an aufs branch"
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depends on HFSPLUS_FS
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default y
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help
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If you want to use hfsplus fs as an aufs branch fs, then enable
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this option. This option introduces a small overhead at
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copying-up a file on hfsplus.
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config AUFS_BDEV_LOOP
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bool
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depends on BLK_DEV_LOOP
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default y
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help
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Automatic configuration for internal use.
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Convert =[ym] into =y.
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config AUFS_DEBUG
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bool "Debug aufs"
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help
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Enable this to compile aufs internal debug code.
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It will have a negative impact to the performance.
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config AUFS_MAGIC_SYSRQ
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bool
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depends on AUFS_DEBUG && MAGIC_SYSRQ
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default y
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help
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Automatic configuration for internal use.
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When aufs supports Magic SysRq, enabled automatically.
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endif
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