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io_uring: COW io_identity on mismatch

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If the io_identity doesn't completely match the task, then create a
copy of it and use that. The existing copy remains valid until the last
user of it has gone away.

This also changes the personality lookup to be indexed by io_identity,
instead of creds directly.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-10-15 08:46:24 -06:00
parent 98447d65b4
commit 1e6fa5216a
2 changed files with 189 additions and 70 deletions
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1
include/linux/io_uring.h
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@ -15,6 +15,7 @@ struct io_identity {
struct nsproxy *nsproxy;
struct fs_struct *fs;
unsigned long fsize;
refcount_t count;
};
struct io_uring_task {