Re: [PATCH v12 10/12] namei: aggressively check for nd->root escape on ".." resolution
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: 2019-09-04 21:37:12
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linux-alpha, linux-api, linux-arch, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-mips, linux-s390, linux-sh, lkml, sparclinux
On Wed, Sep 4, 2019 at 2:35 PM Linus Torvalds [off-list ref] wrote:
On Wed, Sep 4, 2019 at 2:09 PM Linus Torvalds [off-list ref] wrote:quoted
So you'd have three stages: 1) ".." always returns -EXDEV 2) ".." returns -EXDEV if there was a concurrent rename/mount 3) ".." returns -EXDEV if there was a concurrent rename/mount and we reset the sequence numbers and check if you escaped.In fact, I wonder if this should return -EAGAIN instead - to say that "retrying may work".
And here "this" was meant to be "case 2" - I was moving the quoted
text around and didn't fix my wording, so now it is ambiguous or
implies #3, which would be crazy.
Sorry for the confusion,
Linus