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| author | Heiko Carstens <hca@linux.ibm.com> | 2023-07-04 15:47:13 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-07-24 12:12:22 +0200 |
| commit | 3325b4d85799957aa53514e69bed5c9df7771caf (patch) | |
| tree | 3c47e58f6881eccf4f7d5817b744b297302bfad8 /arch/s390/Kconfig | |
| parent | b7857acc1b1105da5f088fe2593f1a6e3a3d47ce (diff) | |
| download | linux-stable-3325b4d85799957aa53514e69bed5c9df7771caf.tar.gz linux-stable-3325b4d85799957aa53514e69bed5c9df7771caf.tar.bz2 linux-stable-3325b4d85799957aa53514e69bed5c9df7771caf.zip | |
s390/hypfs: factor out filesystem code
The s390_hypfs filesystem is deprecated and shouldn't be used due to its
rather odd semantics. It creates a whole directory structure with static
file contents so a user can read a consistent state while within that
directory.
Writing to its update attribute will remove and rebuild nearly the whole
filesystem, so that again a user can read a consistent state, even if
multiple files need to be read.
Given that this wastes a lot of CPU cycles, and involves a lot of code,
binary interfaces have been added quite a couple of years ago, which simply
pass the binary data to user space, and let user space decode the data.
This is the preferred and only way how the data should be retrieved.
The assumption is that there are no users of the s390_hypfs filesystem.
However instead of just removing the code, and having to revert in case
there are actually users, factor the filesystem code out and make it only
available via a new config option.
This config option is supposed to be disabled. If it turns out there are no
complaints the filesystem code can be removed probably in a couple of
years.
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c0afca69904e..ea0e8f34eb0d 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -877,13 +877,24 @@ config APPLDATA_NET_SUM This can also be compiled as a module, which will be called appldata_net_sum.o. -config S390_HYPFS_FS +config S390_HYPFS def_bool y + prompt "s390 hypervisor information" + help + This provides several binary files at (debugfs)/s390_hypfs/ to + provide accounting information in an s390 hypervisor environment. + +config S390_HYPFS_FS + def_bool n prompt "s390 hypervisor file system support" select SYS_HYPERVISOR + depends on S390_HYPFS help This is a virtual file system intended to provide accounting - information in an s390 hypervisor environment. + information in an s390 hypervisor environment. This file system + is deprecated and should not be used. + + Say N if you are unsure. source "arch/s390/kvm/Kconfig" |