2018-11-14 12:26:45 +01:00
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From 9c6fbdcb126ed8d0567ac3b88dac1bf34d4036fb Mon Sep 17 00:00:00 2001
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2018-11-02 14:41:02 +01:00
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From: Werner Fink <werner@suse.de>
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2018-11-14 12:26:45 +01:00
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Date: Wed, 14 Nov 2018 08:49:45 +0100
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2018-11-02 14:41:02 +01:00
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Subject: [PATCH] Use new statx(2) system call to avoid hangs on NFS
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Signed-off-by: Werner Fink <werner@suse.de>
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---
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Makefile.am | 4 +-
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configure.ac | 38 +++---
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src/fuser.c | 86 +++-----------
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src/statx.c | 147 +++++++++++++++++++++++
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2018-11-05 08:52:51 +01:00
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src/statx.h | 66 +++++++++++
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2018-11-02 14:41:02 +01:00
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src/timeout.c | 372 ----------------------------------------------------------
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src/timeout.h | 45 -------
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2018-11-05 09:39:03 +01:00
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7 files changed, 248 insertions(+), 510 deletions(-)
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2018-11-02 14:41:02 +01:00
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create mode 100644 src/statx.c
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create mode 100644 src/statx.h
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delete mode 100644 src/timeout.c
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delete mode 100644 src/timeout.h
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diff --git Makefile.am Makefile.am
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index d8c4619..a76799c 100644
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--- Makefile.am
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+++ Makefile.am
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@@ -58,8 +58,8 @@ src_fuser_SOURCES = \
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src/fuser.h \
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src/lists.h
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-if WANT_TIMEOUT_STAT
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-src_fuser_SOURCES += src/timeout.c src/timeout.h
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+if HAVE_SYSCALL_STATX
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+src_fuser_SOURCES += src/statx.c src/statx.h
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endif
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src_fuser_LDADD = @LIBINTL@
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src_killall_SOURCES = src/killall.c src/comm.h src/signals.c src/signals.h src/i18n.h
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diff --git configure.ac configure.ac
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index d8d3366..81d3674 100644
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--- configure.ac
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+++ configure.ac
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@@ -33,20 +33,6 @@ else
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fi
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AC_SUBST([SELINUX_LIB])
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-# Call fork before all stat calls to stop hanging on NFS mounts
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-AC_SUBST([WITH_TIMEOUT_STAT])
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-AC_ARG_ENABLE([timeout_stat],
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- [AS_HELP_STRING([--enable-timeout-stat], [Use a timeout on stat calls (optional with argument "static" for a static background process)])],
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- [enable_timeout_stat=$enableval],
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- [enable_timeout_stat="no"])
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-if test "$enable_timeout_stat" = "yes"; then
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- AC_DEFINE([WITH_TIMEOUT_STAT], [1], [Use timeout on stat calls])
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-fi
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-if test "$enable_timeout_stat" = "static"; then
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- AC_DEFINE([WITH_TIMEOUT_STAT], [2], [Use timeout on stat calls])
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-fi
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-AM_CONDITIONAL([WANT_TIMEOUT_STAT], [test "$enable_timeout_stat" = "static"])
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-
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# Use /proc/self/mountinfo if available
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if test -e /proc/self/mountinfo ; then
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AC_DEFINE([HAS_MOUNTINFO], [1], [System has /proc/self/mountinfo which can used instead /proc(/self)/mounts])
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@@ -60,16 +46,20 @@ fi
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AC_CHECK_FUNC([name_to_handle_at],[
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AC_DEFINE([HAS_NAME_TO_HANDLE_AT], [1], [System has name_to_handle_at(2) system call])])
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-# Use string search for network based file systems but only if the system
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-# has /proc/self/mountinfo
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-AC_SUBST([WITH_MOUNTINFO_LIST])
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-AC_ARG_ENABLE([mountinfo_list],
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- [AS_HELP_STRING([--enable-mountinfo-list], [Use the list in /proc/self/mountinfo to replace stat(2) syscall on network file systems shares])],
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- [enable_mountinfo_list="yes"],
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- [enable_mountinfo_list="no"])
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-if test "$enable_mountinfo_list" = "yes" -a -e /proc/self/mountinfo ; then
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- AC_DEFINE([WITH_MOUNTINFO_LIST], [1], [Use list in /proc/self/mountinfo to replace stat calls])
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-fi
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+AC_CHECK_HEADERS([sys/syscall.h])
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+AC_CHECK_DECLS([SYS_statx],
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+ [has_syscall_statx="yes"],
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+ [has_syscall_statx="no"],
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+ [[#include <sys/syscall.h>]]
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+)
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+AC_CHECK_FUNCS([statx])
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+# Check for linux specific statx(2) system call
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+AC_SUBST([HAS_SYSCALL_STATX])
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+AC_ARG_ENABLE([disable_statx],
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+ [AS_HELP_STRING([--disable-statx], [Do not use linux specific statx(2) system call as replacement for stat(2), lstat(2), and fstat(2)])],
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+ [enable_syscall_statx="no"],
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+ [enable_syscall_statx=$has_syscall_statx])
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+AM_CONDITIONAL([HAVE_SYSCALL_STATX], [test "$enable_syscall_statx" = "yes"])
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# Enable hardened compile and link flags
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AC_ARG_ENABLE([harden_flags],
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diff --git src/fuser.c src/fuser.c
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2018-11-14 12:26:45 +01:00
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index 970b52d..e2d14bf 100644
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2018-11-02 14:41:02 +01:00
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--- src/fuser.c
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+++ src/fuser.c
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@@ -63,7 +63,7 @@
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#include "fuser.h"
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#include "signals.h"
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#include "i18n.h"
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-#include "timeout.h"
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+#include "statx.h"
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#include "comm.h"
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//#define DEBUG 1
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@@ -118,10 +118,6 @@ static void clear_mntinfo(void) __attribute__ ((__destructor__));
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static void init_mntinfo(void) __attribute__ ((__constructor__));
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static int get_fdinfo(const pid_t pid, const char *fd, struct fdinfo *info);
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static int find_mountpoint(const char *path, mntinfo_t **mountinfo);
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-#if defined(WITH_MOUNTINFO_LIST)
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-static int mntstat(const char *path, struct stat *buf);
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-#endif
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-static stat_t thestat = stat;
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static char *expandpath(const char *path);
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static struct unixsocket_list *unixsockets = NULL;
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static struct names *names_head = NULL, *names_tail = NULL;
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2018-11-14 12:26:45 +01:00
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@@ -506,7 +502,7 @@ int parse_file(struct names *this_name, struct inode_list **ino_list,
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2018-11-02 14:41:02 +01:00
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free(this_name->filename);
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this_name->filename = strdup(new);
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}
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- if (timeout(thestat, this_name->filename, &(this_name->st), 5) != 0 ||
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+ if (statn(this_name->filename, STATX_INO, &(this_name->st)) != 0 ||
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find_mountpoint(this_name->filename, &mountinfo) != 0) {
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if (errno == ENOENT)
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fprintf(stderr,
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2018-11-14 12:26:45 +01:00
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@@ -1233,9 +1229,7 @@ int main(int argc, char *argv[])
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2018-11-02 14:41:02 +01:00
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opts |= OPT_INTERACTIVE;
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break;
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case 'I':
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-#if defined(WITH_MOUNTINFO_LIST)
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opts |= OPT_ALWAYSSTAT;
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-#endif
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break;
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case 'k':
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opts |= OPT_KILL;
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2018-11-14 12:26:45 +01:00
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@@ -1301,10 +1295,11 @@ int main(int argc, char *argv[])
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2018-11-02 14:41:02 +01:00
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continue;
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}
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-#if defined(WITH_MOUNTINFO_LIST)
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- if ((opts & (OPT_MOUNTS|OPT_ALWAYSSTAT)) == OPT_MOUNTS)
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- thestat = mntstat;
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2018-11-05 09:39:03 +01:00
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+#if defined(HAVE_DECL_SYS_STATX) && HAVE_DECL_SYS_STATX == 1
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2018-11-02 14:41:02 +01:00
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+ if ((opts & OPT_ALWAYSSTAT))
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+ stat_flags = 0; /* Triggers sync with e.g. remote NFS server even on autofs */
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2018-11-05 09:39:03 +01:00
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#endif
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2018-11-02 14:41:02 +01:00
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+
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/* an option */
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/* Not an option, must be a file specification */
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if ((this_name = malloc(sizeof(struct names))) == NULL)
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2018-11-14 12:26:45 +01:00
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@@ -1624,7 +1619,7 @@ static struct stat *get_pidstat(const pid_t pid, const char *filename, int *id)
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2018-11-02 14:41:02 +01:00
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if ((st = (struct stat *)malloc(sizeof(struct stat))) == NULL)
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return NULL;
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snprintf(pathname, 256, "/proc/%d/%s", pid, filename);
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- if (timeout(thestat, pathname, st, 5) != 0) {
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+ if (statn(pathname, STATX_UID|STATX_INO|STATX_TYPE, st) != 0) {
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free(st);
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return NULL;
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}
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2018-11-14 12:26:45 +01:00
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@@ -1671,7 +1666,7 @@ check_dir(const pid_t pid, const char *dirname, struct device_list *dev_head,
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2018-11-02 14:41:02 +01:00
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snprintf(filepath, sizeof filepath - 1, "/proc/%d/%s/%s",
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pid, dirname, direntry->d_name);
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- if (timeout(thestat, filepath, &st, 5) != 0) {
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+ if (statn(filepath, STATX_INO, &st) != 0) {
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if (errno != ENOENT && errno != ENOTDIR) {
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fprintf(stderr, _("Cannot stat file %s: %s\n"),
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filepath, strerror(errno));
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2018-11-14 12:26:45 +01:00
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@@ -1726,7 +1721,7 @@ check_dir(const pid_t pid, const char *dirname, struct device_list *dev_head,
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2018-11-02 14:41:02 +01:00
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if (thedev != ino_tmp->device)
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continue;
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if (!st.st_ino
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- && timeout(thestat, filepath, &st, 5) != 0) {
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+ && statn(filepath, STATX_INO, &st) != 0) {
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fprintf(stderr,
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_("Cannot stat file %s: %s\n"),
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filepath, strerror(errno));
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2018-11-14 12:26:45 +01:00
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@@ -1824,11 +1819,11 @@ static uid_t getpiduid(const pid_t pid)
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2018-11-02 14:41:02 +01:00
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if (asprintf(&pathname, "/proc/%d", pid) < 0)
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return 0;
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- if (timeout(thestat, pathname, &st, 5) != 0) {
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- free(pathname);
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+ if (statn(pathname, STATX_UID, &st) != 0) {
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+ free(pathname);
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return 0;
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- }
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- free(pathname);
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+ }
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+ free(pathname);
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return st.st_uid;
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}
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2018-11-14 12:26:45 +01:00
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@@ -1866,7 +1861,7 @@ void fill_unix_cache(struct unixsocket_list **unixsocket_head)
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2018-11-02 14:41:02 +01:00
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path = scanned_path;
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if (*scanned_path == '@')
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scanned_path++;
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- if (timeout(thestat, scanned_path, &st, 5) < 0) {
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+ if (statn(scanned_path, STATX_INO, &st) < 0) {
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free(path);
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continue;
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}
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2018-11-14 12:26:45 +01:00
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@@ -2001,7 +1996,7 @@ static dev_t find_net_dev(void)
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2018-11-02 14:41:02 +01:00
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fprintf(stderr, _("Cannot open a network socket.\n"));
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return -1;
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}
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- if (fstat(skt, &st) != 0) {
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+ if (fstatn(skt, STATX_INO, &st) != 0) {
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fprintf(stderr, _("Cannot find socket's device number.\n"));
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close(skt);
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return -1;
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2018-11-14 12:26:45 +01:00
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@@ -2034,7 +2029,7 @@ scan_knfsd(struct names *names_head, struct inode_list *ino_head,
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2018-11-02 14:41:02 +01:00
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if ((find_space = strpbrk(line, " \t")) == NULL)
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continue;
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*find_space = '\0';
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- if (timeout(thestat, line, &st, 5) != 0) {
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+ if (statn(line, STATX_INO, &st) != 0) {
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continue;
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}
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/* Scan the devices */
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2018-11-14 12:26:45 +01:00
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@@ -2069,7 +2064,7 @@ scan_mounts(struct names *names_head, struct inode_list *ino_head,
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2018-11-02 14:41:02 +01:00
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mntinfo_t *mnt = list_entry(ptr, mntinfo_t);
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const char *find_mountp = mnt->mpoint;
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- if (timeout(thestat, find_mountp, &st, 5) != 0)
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+ if (statn(find_mountp, STATX_INO, &st) != 0)
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continue;
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/* Scan the devices */
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2018-11-14 12:26:45 +01:00
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@@ -2116,7 +2111,7 @@ scan_swaps(struct names *names_head, struct inode_list *ino_head,
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2018-11-02 14:41:02 +01:00
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if (*find_space == '\0')
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continue;
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}
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- if (timeout(thestat, line, &st, 5) != 0) {
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+ if (statn(line, STATX_INO, &st) != 0) {
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continue;
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}
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/* Scan the devices */
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2018-11-14 12:26:45 +01:00
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@@ -2279,7 +2274,7 @@ out:
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2018-11-02 14:41:02 +01:00
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struct stat lst;
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snprintf(pathname, 256, "/proc/%d/fd/%s", pid, fd);
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- if (!flags && lstat(pathname, &lst) == 0) {
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+ if (!flags && lstatn(pathname, STATX_MODE, &lst) == 0) {
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if (lst.st_mode & S_IWUSR)
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info->flags |= O_WRONLY;
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ret++;
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2018-11-14 12:26:45 +01:00
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@@ -2422,49 +2417,6 @@ out:
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2018-11-02 14:41:02 +01:00
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return ret;
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}
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-#if defined(WITH_MOUNTINFO_LIST)
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-/*
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- * Determine device of links below /proc/
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- */
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-static int mntstat(const char *path, struct stat *buf)
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-{
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- char name[PATH_MAX + 1];
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- const char *use;
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- mntinfo_t *mnt;
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-
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- if ((use = realpath(path, name)) == NULL || *use != '/')
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- {
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- if (errno == ENOENT)
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- return -1;
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- /*
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- * Could be a special file (socket, pipe, inotify)
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- */
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- errno = 0;
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- return stat(path, buf);
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- }
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- if (strncmp("/dev/", use, 5) == 0) {
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- /*
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- * Could be a special file (socket, pipe, inotify)
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- */
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- errno = 0;
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- return stat(path, buf);
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- }
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-
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- if (find_mountpoint(use, &mnt) < 0) {
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- errno = ENOENT;
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- return -1;
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- }
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-
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- if (mnt->isremote) {
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- buf->st_dev = mnt->dev;
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- buf->st_ino = mnt->id; /* inode substitute */
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- return 0; /* found on NFS */
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- }
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-
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- return stat(path, buf);
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-}
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-#endif /* WITH_MOUNTINFO_LIST */
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-
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/*
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* Somehow the realpath(3) glibc function call, nevertheless
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* it avoids lstat(2) system calls.
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diff --git src/statx.c src/statx.c
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new file mode 100644
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index 0000000..2554da7
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--- /dev/null
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+++ src/statx.c
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@@ -0,0 +1,147 @@
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+/*
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+ * statx.c - Map modern statx(2) system call to older stat(2), lstat(2),
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+ * and fstat(2) replacements named {,l,f}statn()
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+ *
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+ * Copyright (C) 2018 Werner Fink
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+#ifndef _GNU_SOURCE
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+#define _GNU_SOURCE
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+#endif
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+
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+#ifdef HAVE_CONFIG_H
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+#include <config.h>
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+#endif
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+
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+#ifndef HAVE_STATX
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+# define _ASM_GENERIC_FCNTL_H /* Avoid collisions between asm/fcntl.h and bits/fcntl.h ! */
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+# include <linux/fcntl.h> /* Definition of AT_* and AT_STATX_* constants ! */
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+#endif
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+#include <fcntl.h> /* Definition of AT_* constants */
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+#ifndef HAVE_STATX
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+# include <linux/stat.h> /* Provides 'struct statx' and STATX_* ! */
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+#endif
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+#include <sys/stat.h>
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+#include <sys/sysmacros.h>
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+#include <sys/syscall.h>
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+#include <sys/types.h>
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+#include <unistd.h>
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+
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+int stat_flags = AT_NO_AUTOMOUNT|AT_STATX_DONT_SYNC;
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+
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+int statn(const char *pathname, unsigned int mask, struct stat *st)
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+{
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+ int flags = stat_flags;
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+ int dirfd = pathname && *pathname == '/' ? 0 : AT_FDCWD;
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+ int ret;
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+ struct statx stx;
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+
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+#ifndef HAVE_STATX
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+ ret = syscall(SYS_statx, dirfd, pathname, flags, mask, &stx);
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+#else
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+ ret = statx(dirfd, pathname, flags, mask, &stx);
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+#endif
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+ if (ret >= 0) {
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+ st->st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor);
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+ st->st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor);
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+
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+ st->st_ino = stx.stx_ino;
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+ st->st_mode = stx.stx_mode;
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+ st->st_nlink = stx.stx_nlink;
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+ st->st_uid = stx.stx_uid;
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+ st->st_gid = stx.stx_gid;
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+ st->st_size = stx.stx_size;
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+ st->st_blksize = stx.stx_blksize;
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+ st->st_blocks = stx.stx_blocks;
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+
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+ st->st_atim.tv_sec = stx.stx_atime.tv_sec;
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+ st->st_atim.tv_nsec = stx.stx_atime.tv_nsec;
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+ st->st_mtim.tv_sec = stx.stx_mtime.tv_sec;
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+ st->st_mtim.tv_nsec = stx.stx_mtime.tv_nsec;
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+ st->st_ctim.tv_sec = stx.stx_ctime.tv_sec;
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+ st->st_ctim.tv_nsec = stx.stx_ctime.tv_nsec;
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+ }
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+ return ret;
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+}
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+
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+int fstatn(int fd, unsigned int mask, struct stat *st)
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+{
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+ int flags = AT_EMPTY_PATH|stat_flags;
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+ int ret;
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+ struct statx stx;
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+
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+#ifndef HAVE_STATX
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+ ret = syscall(SYS_statx, fd, "", flags, mask, &stx);
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+#else
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+ ret = statx(fd, "", flags, mask, &stx);
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+#endif
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+ if (ret >= 0) {
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+ st->st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor);
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+ st->st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor);
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+
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+ st->st_ino = stx.stx_ino;
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+ st->st_mode = stx.stx_mode;
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+ st->st_nlink = stx.stx_nlink;
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+ st->st_uid = stx.stx_uid;
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+ st->st_gid = stx.stx_gid;
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+ st->st_size = stx.stx_size;
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+ st->st_blksize = stx.stx_blksize;
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+ st->st_blocks = stx.stx_blocks;
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+
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+ st->st_atim.tv_sec = stx.stx_atime.tv_sec;
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+ st->st_atim.tv_nsec = stx.stx_atime.tv_nsec;
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+ st->st_mtim.tv_sec = stx.stx_mtime.tv_sec;
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+ st->st_mtim.tv_nsec = stx.stx_mtime.tv_nsec;
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+ st->st_ctim.tv_sec = stx.stx_ctime.tv_sec;
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+ st->st_ctim.tv_nsec = stx.stx_ctime.tv_nsec;
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+ }
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+ return ret;
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+}
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+
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+int lstatn(const char *pathname, unsigned int mask, struct stat *st)
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+{
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+ int flags = AT_SYMLINK_NOFOLLOW|stat_flags;
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+ int dirfd = pathname && *pathname == '/' ? 0 : AT_FDCWD;
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+ int ret;
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+ struct statx stx;
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+
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+#ifndef HAVE_STATX
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+ ret = syscall(SYS_statx, dirfd, pathname, flags, mask, &stx);
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+#else
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+ ret = statx(dirfd, pathname, flags, mask, &stx);
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+#endif
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+ if (ret >= 0) {
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+ st->st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor);
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+ st->st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor);
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+
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+ st->st_ino = stx.stx_ino;
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+ st->st_mode = stx.stx_mode;
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+ st->st_nlink = stx.stx_nlink;
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+ st->st_uid = stx.stx_uid;
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+ st->st_gid = stx.stx_gid;
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+ st->st_size = stx.stx_size;
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+ st->st_blksize = stx.stx_blksize;
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+ st->st_blocks = stx.stx_blocks;
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+
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+ st->st_atim.tv_sec = stx.stx_atime.tv_sec;
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+ st->st_atim.tv_nsec = stx.stx_atime.tv_nsec;
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+ st->st_mtim.tv_sec = stx.stx_mtime.tv_sec;
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+ st->st_mtim.tv_nsec = stx.stx_mtime.tv_nsec;
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+ st->st_ctim.tv_sec = stx.stx_ctime.tv_sec;
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+ st->st_ctim.tv_nsec = stx.stx_ctime.tv_nsec;
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+ }
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+ return ret;
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+}
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diff --git src/statx.h src/statx.h
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new file mode 100644
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2018-11-05 09:39:03 +01:00
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index 0000000..bc9eda7
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2018-11-02 14:41:02 +01:00
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--- /dev/null
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+++ src/statx.h
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2018-11-05 08:52:51 +01:00
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@@ -0,0 +1,66 @@
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2018-11-02 14:41:02 +01:00
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+/*
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+ * statx.h - Map modern statx(2) system call to older stat(2), lstat(2),
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+ * and fstat(2) replacements named {,l,f}statn()
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+ *
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+ * Copyright (C) 2018 Werner Fink
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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|
|
|
+ * it under the terms of the GNU General Public License as published by
|
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|
+ * the Free Software Foundation; either version 2 of the License, or
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|
|
+ * (at your option) any later version.
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|
|
+ *
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|
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|
+ * This program is distributed in the hope that it will be useful,
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|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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|
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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|
|
+ * GNU General Public License for more details.
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|
|
|
+ *
|
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|
+ * You should have received a copy of the GNU General Public License
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|
+ * along with this program; if not, write to the Free Software
|
|
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|
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#ifndef _STATX_H
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+#define _STATX_H
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+
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+extern int stat_flags;
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+#if defined(HAVE_DECL_SYS_STATX) && HAVE_DECL_SYS_STATX == 1
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2018-11-05 08:52:51 +01:00
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+# ifndef HAVE_STATX
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+# define _ASM_GENERIC_FCNTL_H /* Avoid collisions between asm/fcntl.h and bits/fcntl.h ! */
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|
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+# include <linux/fcntl.h> /* Definition of AT_* and AT_STATX_* constants ! */
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|
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+# include <linux/stat.h> /* Provides 'struct statx' and STATX_* ! */
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+# endif
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2018-11-02 14:41:02 +01:00
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+extern int statn(const char*, unsigned int, struct stat*);
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+extern int fstatn(int, unsigned int, struct stat*);
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+extern int lstatn(const char*, unsigned int, struct stat*);
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+#else
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+extern inline int
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2018-11-05 09:39:03 +01:00
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+statn(const char *path, unsigned int mask __attribute__((unused)), struct stat *st)
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2018-11-02 14:41:02 +01:00
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+{
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+ return stat(path, st);
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+}
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+extern inline int
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2018-11-05 09:39:03 +01:00
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+fstatn(int fd, unsigned int mask __attribute__((unused)), struct stat *st)
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2018-11-02 14:41:02 +01:00
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+{
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+ return fstat(fd, st);
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+}
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+extern inline int
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2018-11-05 09:39:03 +01:00
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+lstatn(const char *path, unsigned int mask __attribute__((unused)), struct stat *st)
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2018-11-02 14:41:02 +01:00
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+{
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2018-11-05 09:39:03 +01:00
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+ return lstat(path, st);
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2018-11-02 14:41:02 +01:00
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+}
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+#define STATX_TYPE 0
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+#define STATX_MODE 0
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+#define STATX_NLINK 0
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+#define STATX_UID 0
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+#define STATX_GID 0
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+#define STATX_ATIME 0
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+#define STATX_MTIME 0
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+#define STATX_CTIME 0
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+#define STATX_INO 0
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+#define STATX_SIZE 0
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+#define STATX_BLOCKS 0
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+#define STATX_BASIC_STATS 0
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+#define STATX_BTIME 0
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+#define STATX_ALL 0
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+#endif
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+#endif
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diff --git src/timeout.c src/timeout.c
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deleted file mode 100644
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index ca4a7cd..0000000
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--- src/timeout.c
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+++ /dev/null
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@@ -1,372 +0,0 @@
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-/*
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- * timout.c Advanced timeout handling for file system calls
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- * to avoid deadlocks on remote file shares.
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- *
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- * Version: 0.2 11-Dec-2012 Fink
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- *
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- * Copyright 2011,2012 Werner Fink, 2011,2012 SUSE LINUX Products GmbH, Germany.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * Author: Werner Fink <werner@suse.de>, 2011
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- */
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-
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-#ifndef _GNU_SOURCE
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-# define _GNU_SOURCE
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-#endif
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-
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-#ifdef _FEATURES_H
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-# error Include local config.h before any system header file
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-#endif
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-#include "config.h"
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-
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-#ifndef WITH_TIMEOUT_STAT
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-# define WITH_TIMEOUT_STAT 0
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-#endif
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-
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-#ifndef USE_SOCKETPAIR
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-# define USE_SOCKETPAIR 1
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-#endif
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-
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-#include <errno.h>
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-#include <setjmp.h>
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-#include <signal.h>
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-#include <stdlib.h>
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-#include <string.h>
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-#include <sys/mman.h>
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-#include <sys/time.h>
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-#include <sys/types.h>
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-#include <sys/select.h>
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-#include <sys/stat.h>
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-#include <unistd.h>
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-#if USE_SOCKETPAIR
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|
-# include <sys/socket.h>
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-# include <netdb.h>
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-# include <netinet/in.h>
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|
-# ifndef SHUT_RD
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-# define SHUT_RD 0
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-# endif
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-# ifndef SHUT_WR
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-# define SHUT_WR 1
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-# endif
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-# undef pipe
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-# define pipe(v) (((socketpair(AF_UNIX,SOCK_STREAM,0,v) < 0) || \
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- (shutdown((v)[1],SHUT_RD) < 0) || (shutdown((v)[0],SHUT_WR) < 0)) ? -1 : 0)
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-#endif
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-#include <wait.h>
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-
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-#include "timeout.h"
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-
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-#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
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-# ifndef destructor
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-# define destructor __destructor__
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-# endif
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-# ifndef constructor
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-# define constructor __constructor__
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-# endif
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-# ifndef packed
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-# define packed __packed__
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-# endif
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-# ifndef inline
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-# define inline __inline__
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-# endif
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-# ifndef unused
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-# define unused __unused__
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-# endif
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-# ifndef volatile
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-# define volatile __volatile__
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-# endif
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-#endif
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-#ifndef attribute
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|
-# define attribute(attr) __attribute__(attr)
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-#endif
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-
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|
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|
-#if defined __GNUC__
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|
|
-# undef strcpy
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|
|
|
-# define strcpy(d,s) __builtin_strcpy((d),(s)) /* Without boundary check please */
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|
-#endif
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-
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-#if WITH_TIMEOUT_STAT
|
|
|
|
-static sigjmp_buf jenv;
|
|
|
|
-static void sigjump(int sig attribute((unused)))
|
|
|
|
-{
|
|
|
|
- siglongjmp(jenv, 1);
|
|
|
|
-}
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-#if WITH_TIMEOUT_STAT == 2
|
|
|
|
-/*
|
|
|
|
- * The structure used for communication between the processes
|
|
|
|
- */
|
|
|
|
-typedef struct _handle {
|
|
|
|
- int errcode;
|
|
|
|
- struct stat argument;
|
|
|
|
- stat_t function;
|
|
|
|
- size_t len;
|
|
|
|
- char path[0];
|
|
|
|
-} attribute((packed)) handle_t;
|
|
|
|
-
|
|
|
|
-/*
|
|
|
|
- * Using a forked process for doing e.g. stat(2) system call as this
|
|
|
|
- * allows us to send e.g. SIGKILL to this process if it hangs in `D'
|
|
|
|
- * state on a file share due a stalled NFS server. This does not work
|
|
|
|
- * with (p)threads as SIGKILL would kill all threads including main.
|
|
|
|
- */
|
|
|
|
-
|
|
|
|
-static volatile pid_t active;
|
|
|
|
-static int pipes[4] = {-1, -1, -1, -1};
|
|
|
|
-static handle_t *restrict handle;
|
|
|
|
-static const size_t buflen = PATH_MAX+sizeof(handle_t)+1;
|
|
|
|
-
|
|
|
|
-static void sigchild(int sig attribute((unused)))
|
|
|
|
-{
|
|
|
|
- pid_t pid = waitpid(active, NULL, WNOHANG|WUNTRACED);
|
|
|
|
- if (pid <= 0)
|
|
|
|
- return;
|
|
|
|
- if (errno == ECHILD)
|
|
|
|
- return;
|
|
|
|
- active = 0;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-static void attribute((constructor)) start(void)
|
|
|
|
-{
|
|
|
|
- sigset_t sigset, oldset;
|
|
|
|
- struct sigaction act;
|
|
|
|
- char sync[1];
|
|
|
|
- ssize_t in;
|
|
|
|
-
|
|
|
|
- if (pipes[1] >= 0) close(pipes[1]);
|
|
|
|
- if (pipes[2] >= 0) close(pipes[2]);
|
|
|
|
-
|
|
|
|
- if (pipe(&pipes[0]))
|
|
|
|
- goto error;
|
|
|
|
- if (pipe(&pipes[2]))
|
|
|
|
- goto error;
|
|
|
|
-
|
|
|
|
- memset(&act, 0, sizeof(act));
|
|
|
|
- sigemptyset(&act.sa_mask);
|
|
|
|
- act.sa_flags = SA_RESTART;
|
|
|
|
- act.sa_handler = sigchild;
|
|
|
|
- sigaction(SIGCHLD, &act, 0);
|
|
|
|
-
|
|
|
|
- if (!handle)
|
|
|
|
- handle = mmap(NULL, buflen, PROT_READ|PROT_WRITE,
|
|
|
|
- MAP_ANONYMOUS|MAP_SHARED, -1, 0);
|
|
|
|
- if (handle == MAP_FAILED)
|
|
|
|
- goto error;
|
|
|
|
-
|
|
|
|
- if ((active = fork()) < 0)
|
|
|
|
- goto error;
|
|
|
|
-
|
|
|
|
- if (active) {
|
|
|
|
- close(pipes[0]);
|
|
|
|
- close(pipes[3]);
|
|
|
|
- pipes[0] = pipes[3] = -1;
|
|
|
|
- return;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- sigemptyset(&sigset);
|
|
|
|
- sigaddset(&sigset, SIGALRM);
|
|
|
|
- sigprocmask(SIG_BLOCK, &sigset, &oldset);
|
|
|
|
-
|
|
|
|
- act.sa_handler = SIG_DFL;
|
|
|
|
- sigaction(SIGCHLD, &act, 0);
|
|
|
|
-
|
|
|
|
- close(pipes[1]);
|
|
|
|
- close(pipes[2]);
|
|
|
|
- dup2(pipes[0], STDIN_FILENO);
|
|
|
|
- dup2(pipes[3], STDOUT_FILENO);
|
|
|
|
- close(pipes[0]);
|
|
|
|
- close(pipes[3]);
|
|
|
|
- pipes[1] = pipes[2] = -1;
|
|
|
|
- pipes[0] = pipes[3] = -1;
|
|
|
|
-
|
|
|
|
- while ((in = read(STDIN_FILENO, &sync, sizeof(sync))) != 0) {
|
|
|
|
- ssize_t out;
|
|
|
|
- if (in < 0) {
|
|
|
|
- if (errno == EINTR)
|
|
|
|
- continue;
|
|
|
|
- break;
|
|
|
|
- }
|
|
|
|
- if (!handle)
|
|
|
|
- break;
|
|
|
|
- if (handle->function(handle->path, &handle->argument) < 0)
|
|
|
|
- handle->errcode = errno;
|
|
|
|
- do
|
|
|
|
- out = write(STDOUT_FILENO, &sync, sizeof(sync));
|
|
|
|
- while (out < 0 && errno == EINTR);
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
|
|
- exit(0);
|
|
|
|
-error:
|
|
|
|
- if (pipes[0] >= 0) close(pipes[0]);
|
|
|
|
- if (pipes[1] >= 0) close(pipes[1]);
|
|
|
|
- if (pipes[2] >= 0) close(pipes[2]);
|
|
|
|
- if (pipes[3] >= 0) close(pipes[3]);
|
|
|
|
- if (handle && handle != MAP_FAILED)
|
|
|
|
- munmap(handle, buflen);
|
|
|
|
- handle = NULL;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-static void /* attribute((destructor)) */ stop(void)
|
|
|
|
-{
|
|
|
|
- if (active && waitpid(active, NULL, WNOHANG|WUNTRACED) == 0)
|
|
|
|
- kill(active, SIGKILL);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-/*
|
|
|
|
- * External routine
|
|
|
|
- *
|
|
|
|
- * Execute stat(2) system call with timeout to avoid deadlock
|
|
|
|
- * on network based file systems.
|
|
|
|
- *
|
|
|
|
- */
|
|
|
|
-int
|
|
|
|
-timeout(stat_t function, const char *path, struct stat *restrict argument, time_t seconds)
|
|
|
|
-{
|
|
|
|
- struct sigaction alrm_act, pipe_act, new_act;
|
|
|
|
- sigset_t sigset, oldset;
|
|
|
|
- char sync[1] = "x";
|
|
|
|
-
|
|
|
|
- if (active <= 0) /* Oops, last one failed therefore clear status and restart */
|
|
|
|
- start();
|
|
|
|
- if (!handle) /* No shared memory area */
|
|
|
|
- return function(path, argument);
|
|
|
|
- memset(handle, 0, sizeof(handle_t));
|
|
|
|
- handle->len = strlen(path) + 1;
|
|
|
|
- if (handle->len >= PATH_MAX) {
|
|
|
|
- errno = ENAMETOOLONG;
|
|
|
|
- goto error;
|
|
|
|
- }
|
|
|
|
- handle->errcode = 0;
|
|
|
|
- handle->argument = *argument;
|
|
|
|
- handle->function = function;
|
|
|
|
- strcpy(handle->path, path);
|
|
|
|
-
|
|
|
|
- sigemptyset(&sigset);
|
|
|
|
- sigaddset(&sigset, SIGALRM);
|
|
|
|
- sigaddset(&sigset, SIGPIPE);
|
|
|
|
- sigprocmask(SIG_UNBLOCK, &sigset, &oldset);
|
|
|
|
-
|
|
|
|
- memset(&new_act, 0, sizeof(new_act));
|
|
|
|
- sigemptyset(&new_act.sa_mask);
|
|
|
|
- new_act.sa_flags = SA_RESETHAND;
|
|
|
|
-
|
|
|
|
- if (sigsetjmp(jenv, 1))
|
|
|
|
- goto timed;
|
|
|
|
-
|
|
|
|
- new_act.sa_handler = sigjump;
|
|
|
|
- sigaction(SIGALRM, &new_act, &alrm_act);
|
|
|
|
- sigaction(SIGPIPE, &new_act, &pipe_act);
|
|
|
|
- alarm(seconds);
|
|
|
|
-
|
|
|
|
- write(pipes[1], &sync, sizeof(sync));
|
|
|
|
- read(pipes[2], &sync, sizeof(sync));
|
|
|
|
-
|
|
|
|
- alarm(0);
|
|
|
|
- sigaction(SIGPIPE, &pipe_act, NULL);
|
|
|
|
- sigaction(SIGALRM, &alrm_act, NULL);
|
|
|
|
-
|
|
|
|
- if (handle->errcode) {
|
|
|
|
- errno = handle->errcode;
|
|
|
|
- goto error;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- *argument = handle->argument;
|
|
|
|
- sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
|
|
-
|
|
|
|
- return 0;
|
|
|
|
-timed:
|
|
|
|
- (void) alarm(0);
|
|
|
|
- sigaction(SIGPIPE, &pipe_act, NULL);
|
|
|
|
- sigaction(SIGALRM, &alrm_act, NULL);
|
|
|
|
- sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
|
|
- stop();
|
|
|
|
- errno = ETIMEDOUT;
|
|
|
|
-error:
|
|
|
|
- return -1;
|
|
|
|
-}
|
|
|
|
-#elif WITH_TIMEOUT_STAT == 1
|
|
|
|
-/*
|
|
|
|
- * External routine
|
|
|
|
- *
|
|
|
|
- * Execute stat(2) system call with timeout to avoid deadlock
|
|
|
|
- * on network based file systems.
|
|
|
|
- *
|
|
|
|
- */
|
|
|
|
-int
|
|
|
|
-timeout(stat_t function, const char *path, struct stat *restrict argument, time_t seconds)
|
|
|
|
-{
|
|
|
|
- struct sigaction alrm_act, pipe_act, new_act;
|
|
|
|
- sigset_t sigset, oldset;
|
|
|
|
- int ret = 0, pipes[4];
|
|
|
|
- pid_t pid = 0;
|
|
|
|
- ssize_t len;
|
|
|
|
-
|
|
|
|
- if (pipe(&pipes[0]) < 0)
|
|
|
|
- goto error;
|
|
|
|
- switch ((pid = fork())) {
|
|
|
|
- case -1:
|
|
|
|
- close(pipes[0]);
|
|
|
|
- close(pipes[1]);
|
|
|
|
- goto error;
|
|
|
|
- case 0:
|
|
|
|
- new_act.sa_handler = SIG_DFL;
|
|
|
|
- sigaction(SIGALRM, &new_act, NULL);
|
|
|
|
- close(pipes[0]);
|
|
|
|
- if ((ret = function(path, argument)) == 0)
|
|
|
|
- do
|
|
|
|
- len = write(pipes[1], argument, sizeof(struct stat));
|
|
|
|
- while (len < 0 && errno == EINTR);
|
|
|
|
- close(pipes[1]);
|
|
|
|
- exit(ret);
|
|
|
|
- default:
|
|
|
|
- close(pipes[1]);
|
|
|
|
-
|
|
|
|
- sigemptyset(&sigset);
|
|
|
|
- sigaddset(&sigset, SIGALRM);
|
|
|
|
- sigaddset(&sigset, SIGPIPE);
|
|
|
|
- sigprocmask(SIG_UNBLOCK, &sigset, &oldset);
|
|
|
|
-
|
|
|
|
- memset(&new_act, 0, sizeof(new_act));
|
|
|
|
- sigemptyset(&new_act.sa_mask);
|
|
|
|
-
|
|
|
|
- if (sigsetjmp(jenv, 1))
|
|
|
|
- goto timed;
|
|
|
|
-
|
|
|
|
- new_act.sa_handler = sigjump;
|
|
|
|
- sigaction(SIGALRM, &new_act, &alrm_act);
|
|
|
|
- sigaction(SIGPIPE, &new_act, &pipe_act);
|
|
|
|
- alarm(seconds);
|
|
|
|
- if (read(pipes[0], argument, sizeof(struct stat)) == 0) {
|
|
|
|
- errno = EFAULT;
|
|
|
|
- ret = -1;
|
|
|
|
- }
|
|
|
|
- (void)alarm(0);
|
|
|
|
- sigaction(SIGPIPE, &pipe_act, NULL);
|
|
|
|
- sigaction(SIGALRM, &alrm_act, NULL);
|
|
|
|
-
|
|
|
|
- close(pipes[0]);
|
|
|
|
- waitpid(pid, NULL, 0);
|
|
|
|
- break;
|
|
|
|
- }
|
|
|
|
- return ret;
|
|
|
|
-timed:
|
|
|
|
- (void)alarm(0);
|
|
|
|
- sigaction(SIGPIPE, &pipe_act, NULL);
|
|
|
|
- sigaction(SIGALRM, &alrm_act, NULL);
|
|
|
|
- if (waitpid(0, NULL, WNOHANG) == 0)
|
|
|
|
- kill(pid, SIGKILL);
|
|
|
|
- errno = ETIMEDOUT;
|
|
|
|
-error:
|
|
|
|
- return -1;
|
|
|
|
-}
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-/*
|
|
|
|
- * End of timeout.c
|
|
|
|
- */
|
|
|
|
diff --git src/timeout.h src/timeout.h
|
|
|
|
deleted file mode 100644
|
|
|
|
index f372297..0000000
|
|
|
|
--- src/timeout.h
|
|
|
|
+++ /dev/null
|
|
|
|
@@ -1,45 +0,0 @@
|
|
|
|
-/*
|
|
|
|
- * timout.h Advanced timeout handling for file system calls
|
|
|
|
- * to avoid deadlocks on remote file shares.
|
|
|
|
- *
|
|
|
|
- * Version: 0.1 07-Sep-2011 Fink
|
|
|
|
- *
|
|
|
|
- * Copyright 2011 Werner Fink, 2011 SUSE LINUX Products GmbH, Germany.
|
|
|
|
- *
|
|
|
|
- * This program is free software; you can redistribute it and/or modify
|
|
|
|
- * it under the terms of the GNU General Public License as published by
|
|
|
|
- * the Free Software Foundation; either version 2 of the License, or
|
|
|
|
- * (at your option) any later version.
|
|
|
|
- *
|
|
|
|
- * Author: Werner Fink <werner@suse.de>, 2011
|
|
|
|
- */
|
|
|
|
-
|
|
|
|
-#ifndef _TIMEOUT_H
|
|
|
|
-#define _TIMEOUT_H
|
|
|
|
-
|
|
|
|
-#include "config.h"
|
|
|
|
-
|
|
|
|
-#ifndef WITH_TIMEOUT_STAT
|
|
|
|
-# define WITH_TIMEOUT_STAT 0
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-#include <sys/types.h>
|
|
|
|
-#include <sys/stat.h>
|
|
|
|
-#include <time.h>
|
|
|
|
-#include <limits.h>
|
|
|
|
-
|
|
|
|
-#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
|
|
|
|
-# ifndef restrict
|
|
|
|
-# define restrict __restrict__
|
|
|
|
-# endif
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-typedef int (*stat_t)(const char *, struct stat *);
|
|
|
|
-
|
|
|
|
-#if WITH_TIMEOUT_STAT > 0
|
|
|
|
-extern int timeout(stat_t, const char *, struct stat *restrict, time_t);
|
|
|
|
-#else
|
|
|
|
-# define timeout(func,path,buf,dummy) (func)((path),(buf))
|
|
|
|
-#endif
|
|
|
|
-
|
|
|
|
-#endif
|
|
|
|
--
|
|
|
|
2.16.4
|
|
|
|
|