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#ifndef IOOPS_H
#define IOOPS_H

#include <sys/types.h>

extern int open_or_die(const char *file, int flags);
extern int open_or_die_m(const char *file, int flags, mode_t mode);
extern int dup_or_die(int oldfd);
extern void dup2_or_die(int oldfd, int newfd);
extern void create_or_die(const char *file, mode_t mode);
extern int tun_open_or_die(const char *name, int type);
extern void pipe_or_die(int pipefd[2], int flags);
extern ssize_t read_or_die(int fd, void *buf, size_t count);
extern ssize_t write_or_die(int fd, const void *buf, size_t count);
extern int read_blob_or_die(const char *file, void *blob, size_t count);
extern int write_blob_or_die(const char *file, const void *blob, size_t count);

#endif /* IOOPS_H */
th>867dfe342118b1ea0256a85f7c0d9ceb0ead032a (diff)
device-dax: fix percpu_ref_exit ordering
We need to wait until the percpu_ref is released before exit. Otherwise, we sometimes lose the race and trigger this new warning that was added in v4.9 (commit a67823c1ed10 "percpu-refcount: init ->confirm_switch member properly"): WARNING: CPU: 0 PID: 3629 at lib/percpu-refcount.c:107 percpu_ref_exit+0x51/0x60 [..] Call Trace: [<ffffffff814bf093>] dump_stack+0x85/0xc2 [<ffffffff810b15db>] __warn+0xcb/0xf0 [<ffffffff810b170d>] warn_slowpath_null+0x1d/0x20 [<ffffffff814d70c1>] percpu_ref_exit+0x51/0x60 [<ffffffffa005706a>] dax_pmem_percpu_exit+0x1a/0x50 [dax_pmem] [<ffffffff81615f1f>] devm_action_release+0xf/0x20 Cc: <stable@vger.kernel.org> Fixes: ab68f2622136 ("/dev/dax, pmem: direct access to persistent memory") Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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