#define _GNU_SOURCE #include #include #include #include #include #include #include #include #include "die.h" #include "dev.h" #include "ioops.h" #include "str.h" #include "built_in.h" int open_or_die(const char *file, int flags) { int ret = open(file, flags); if (unlikely(ret < 0)) panic("Cannot open file %s! %s.\n", file, strerror(errno)); return ret; } int open_or_die_m(const char *file, int flags, mode_t mode) { int ret = open(file, flags, mode); if (unlikely(ret < 0)) panic("Cannot open or create file %s! %s.", file, strerror(errno)); return ret; } int dup_or_die(int oldfd) { int newfd = dup(oldfd); if (unlikely(newfd < 0)) panic("Cannot dup old file descriptor!\n"); return newfd; } void dup2_or_die(int oldfd, int newfd) { int ret = dup2(oldfd, newfd); if (unlikely(ret < 0)) panic("Cannot dup2 old/new file descriptor!\n"); } void create_or_die(const char *file, mode_t mode) { int fd = open_or_die_m(file, O_WRONLY | O_CREAT, mode); close(fd); } void pipe_or_die(int pipefd[2], int flags) { int ret = pipe2(pipefd, flags); if (unlikely(ret < 0)) panic("Cannot create pipe2 event fd! %s.\n", strerror(errno)); } int tun_open_or_die(const char *name, int type) { int fd, ret; short flags; struct ifreq ifr; if (unlikely(!name)) panic("No name provided for tundev!\n"); fd = open_or_die("/dev/net/tun", O_RDWR); memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = type; strlcpy(ifr.ifr_name, name, IFNAMSIZ); ret = ioctl(fd, TUNSETIFF, &ifr); if (unlikely(ret < 0)) panic("ioctl screwed up! %s.\n", strerror(errno)); ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); if (unlikely(ret < 0)) panic("fctnl screwed up! %s.\n", strerror(errno)); flags = device_get_flags(name); flags |= IFF_UP | IFF_RUNNING; device_set_flags(name, flags); return fd; } ssize_t read_or_die(int fd, void *buf, size_t len) { ssize_t ret = read(fd, buf, len); if (unlikely(ret < 0)) { if (errno == EPIPE) die(); panic("Cannot read from descriptor! %s.\n", strerror(errno)); } return ret; } ssize_t write_or_die(int fd, const void *buf, size_t len) { ssize_t ret = write(fd, buf, len); if (unlikely(ret < 0)) { if (errno == EPIPE) die(); panic("Cannot write to descriptor! %s.", strerror(errno)); } return ret; } int read_blob_or_die(const char *file, void *blob, size_t count) { int fd, ret; fd = open_or_die(file, O_RDONLY); ret = read_or_die(fd, blob, count); close(fd); return ret; } int write_blob_or_die(const char *file, const void *blob, size_t count) { int fd, ret; fd = open_or_die_m(file, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); ret = write_or_die(fd, blob, count); fdatasync(fd); close(fd); return ret; } submit();'>space:mode:
authorVitaly Kuznetsov <vkuznets@redhat.com>2016-05-19 17:13:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commit86dd995d63241039e0ad9123f9b424013c611510 (patch)
treed3bee4d667fab9a57ff2a6d499fdb2916524ca05
parent8604d9e534a3e662600e288bcfd1a5acd2763d28 (diff)
memory_hotplug: introduce memhp_default_state= command line parameter
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE specifies the default value for the memory hotplug onlining policy. Add a command line parameter to make it possible to override the default. It may come handy for debug and testing purposes. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Dan Williams <dan.j.williams@intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Vrabel <david.vrabel@citrix.com> Cc: David Rientjes <rientjes@google.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Lennart Poettering <lennart@poettering.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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