vfs: make getcwd() get the root and pwd path under rcu

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This allows us to skip all the crazy spinlocks and reference count
updates, and instead use the fs sequence read-lock to get an atomic
snapshot of the root and cwd information.

We might want to make the rule that "prepend_path()" is always called
with the RCU lock held, but the RCU lock nests fine and this is the
minimal fix.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Linus Torvalds 2013-09-12 10:35:47 -07:00

parent 5762482f54

commit 8b19e34188

1 changed files with 12 additions and 11 deletions

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fs/dcache.c

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