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io_uring-5.6-2020-02-05

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Merge tag 'io_uring-5.6-2020-02-05' of git://git.kernel.dk/linux-block

Pull io_uring updates from Jens Axboe:
 "Some later fixes for io_uring:

   - Small cleanup series from Pavel

   - Belt and suspenders build time check of sqe size and layout
     (Stefan)

   - Addition of ->show_fdinfo() on request of Jann Horn, to aid in
     understanding mapped personalities

   - eventfd recursion/deadlock fix, for both io_uring and aio

   - Fixup for send/recv handling

   - Fixup for double deferral of read/write request

   - Fix for potential double completion event for close request

   - Adjust fadvise advice async/inline behavior

   - Fix for shutdown hang with SQPOLL thread

   - Fix for potential use-after-free of fixed file table"

* tag 'io_uring-5.6-2020-02-05' of git://git.kernel.dk/linux-block:
  io_uring: cleanup fixed file data table references
  io_uring: spin for sq thread to idle on shutdown
  aio: prevent potential eventfd recursion on poll
  io_uring: put the flag changing code in the same spot
  io_uring: iterate req cache backwards
  io_uring: punt even fadvise() WILLNEED to async context
  io_uring: fix sporadic double CQE entry for close
  io_uring: remove extra ->file check
  io_uring: don't map read/write iovec potentially twice
  io_uring: use the proper helpers for io_send/recv
  io_uring: prevent potential eventfd recursion on poll
  eventfd: track eventfd_signal() recursion depth
  io_uring: add BUILD_BUG_ON() to assert the layout of struct io_uring_sqe
  io_uring: add ->show_fdinfo() for the io_uring file descriptor
This commit is contained in:
Linus Torvalds 2020-02-06 06:33:17 +00:00
commit c1ef57a3a3
4 changed files with 251 additions and 52 deletions
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14
include/linux/eventfd.h
View file

@ -12,6 +12,8 @@
#include <linux/fcntl.h>
#include <linux/wait.h>
#include <linux/err.h>
#include <linux/percpu-defs.h>
#include <linux/percpu.h>
/*
* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
@ -40,6 +42,13 @@ __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
__u64 *cnt);
DECLARE_PER_CPU(int, eventfd_wake_count);
static inline bool eventfd_signal_count(void)
{
return this_cpu_read(eventfd_wake_count);
}
#else /* CONFIG_EVENTFD */
/*
@ -68,6 +77,11 @@ static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
return -ENOSYS;
}
static inline bool eventfd_signal_count(void)
{
return false;
}
#endif
#endif /* _LINUX_EVENTFD_H */