fs: cache the string generated by reading /proc/filesystems

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It is being read surprisingly often (e.g., by mkdir, ls and even sed!).

This is lock-protected pointer chasing over a linked list to pay for
sprintf for every fs (32 on my boxen).

Instead cache the result.

While here make the file as permanent to avoid spurious ref trips in
procfs.

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20260425220844.1763933-4-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Mateusz Guzik 2026-04-26 00:08:44 +02:00 • committed by Christian Brauner

parent dc651e25a6

commit 36b3306779

1 changed files with 153 additions and 2 deletions

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fs/filesystems.c

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