#include <linux/swap.h>
#include <linux/wait.h>
#include <linux/mutex.h>
+#include <linux/device.h>
#include "lttng-events.h"
+#include "lttng-tracer.h"
#include "wrapper/irqdesc.h"
#include "wrapper/spinlock.h"
#include "wrapper/fdtable.h"
#include "wrapper/nsproxy.h"
#include "wrapper/irq.h"
#include "wrapper/tracepoint.h"
+#include "wrapper/genhd.h"
#ifdef CONFIG_LTTNG_HAS_LIST_IRQ
#include <linux/irq.h>
#define CREATE_TRACE_POINTS
#define TRACE_INCLUDE_PATH ../instrumentation/events/lttng-module
#define TRACE_INCLUDE_FILE lttng-statedump
+#define LTTNG_INSTRUMENTATION
#include "instrumentation/events/lttng-module/lttng-statedump.h"
+DEFINE_TRACE(lttng_statedump_block_device);
+DEFINE_TRACE(lttng_statedump_end);
+DEFINE_TRACE(lttng_statedump_interrupt);
+DEFINE_TRACE(lttng_statedump_file_descriptor);
+DEFINE_TRACE(lttng_statedump_start);
+DEFINE_TRACE(lttng_statedump_process_state);
+DEFINE_TRACE(lttng_statedump_network_interface);
+
struct lttng_fd_ctx {
char *page;
struct lttng_session *session;
struct task_struct *p;
+ struct files_struct *files;
};
/*
LTTNG_DEAD = 7,
};
+static
+int lttng_enumerate_block_devices(struct lttng_session *session)
+{
+ struct class *ptr_block_class;
+ struct device_type *ptr_disk_type;
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ ptr_block_class = wrapper_get_block_class();
+ if (!ptr_block_class)
+ return -ENOSYS;
+ ptr_disk_type = wrapper_get_disk_type();
+ if (!ptr_disk_type) {
+ return -ENOSYS;
+ }
+ class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
+ while ((dev = class_dev_iter_next(&iter))) {
+ struct disk_part_iter piter;
+ struct gendisk *disk = dev_to_disk(dev);
+ struct hd_struct *part;
+
+ /*
+ * Don't show empty devices or things that have been
+ * suppressed
+ */
+ if (get_capacity(disk) == 0 ||
+ (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
+ continue;
+
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
+ while ((part = disk_part_iter_next(&piter))) {
+ char name_buf[BDEVNAME_SIZE];
+ char *p;
+
+ p = wrapper_disk_name(disk, part->partno, name_buf);
+ if (!p) {
+ disk_part_iter_exit(&piter);
+ class_dev_iter_exit(&iter);
+ return -ENOSYS;
+ }
+ trace_lttng_statedump_block_device(session,
+ part_devt(part), name_buf);
+ }
+ disk_part_iter_exit(&piter);
+ }
+ class_dev_iter_exit(&iter);
+ return 0;
+}
+
#ifdef CONFIG_INET
+
static
void lttng_enumerate_device(struct lttng_session *session,
struct net_device *dev)
}
#endif /* CONFIG_INET */
+#ifdef FD_ISSET /* For old kernels lacking close_on_exec() */
+static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
+{
+ return FD_ISSET(fd, fdt->close_on_exec);
+}
+#else
+static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
+{
+ return close_on_exec(fd, fdt);
+}
+#endif
+
static
int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
{
const struct lttng_fd_ctx *ctx = p;
const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
+ unsigned int flags = file->f_flags;
+ struct fdtable *fdt;
+ /*
+ * We don't expose kernel internal flags, only userspace-visible
+ * flags.
+ */
+ flags &= ~FMODE_NONOTIFY;
+ fdt = files_fdtable(ctx->files);
+ /*
+ * We need to check here again whether fd is within the fdt
+ * max_fds range, because we might be seeing a different
+ * files_fdtable() than iterate_fd(), assuming only RCU is
+ * protecting the read. In reality, iterate_fd() holds
+ * file_lock, which should ensure the fdt does not change while
+ * the lock is taken, but we are not aware whether this is
+ * guaranteed or not, so play safe.
+ */
+ if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt))
+ flags |= O_CLOEXEC;
if (IS_ERR(s)) {
struct dentry *dentry = file->f_path.dentry;
/* Make sure we give at least some info */
spin_lock(&dentry->d_lock);
trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd,
- dentry->d_name.name);
+ dentry->d_name.name, flags, file->f_mode);
spin_unlock(&dentry->d_lock);
goto end;
}
- trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd, s);
+ trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd, s,
+ flags, file->f_mode);
end:
return 0;
}
struct task_struct *p, char *tmp)
{
struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .p = p };
+ struct files_struct *files;
task_lock(p);
- lttng_iterate_fd(p->files, 0, lttng_dump_one_fd, &ctx);
+ files = p->files;
+ if (!files)
+ goto end;
+ ctx.files = files;
+ lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx);
+end:
task_unlock(p);
}
int lttng_enumerate_file_descriptors(struct lttng_session *session)
{
struct task_struct *p;
- char *tmp = (char *) __get_free_page(GFP_KERNEL);
+ char *tmp;
+
+ tmp = (char *) __get_free_page(GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
/* Enumerate active file descriptors */
rcu_read_lock();
#endif
static
-void lttng_list_interrupts(struct lttng_session *session)
+int lttng_list_interrupts(struct lttng_session *session)
{
unsigned int irq;
unsigned long flags = 0;
wrapper_desc_spin_unlock(&desc->lock);
local_irq_restore(flags);
}
+ return 0;
#undef irq_to_desc
}
#else
static inline
-void lttng_list_interrupts(struct lttng_session *session)
+int lttng_list_interrupts(struct lttng_session *session)
{
+ return 0;
}
#endif
+/*
+ * Called with task lock held.
+ */
static
void lttng_statedump_process_ns(struct lttng_session *session,
struct task_struct *p,
struct nsproxy *proxy;
struct pid_namespace *pid_ns;
+ /*
+ * Back and forth on locking strategy within Linux upstream for nsproxy.
+ * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
+ * "namespaces: Use task_lock and not rcu to protect nsproxy"
+ * for details.
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
+ LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0))
+ proxy = p->nsproxy;
+#else
rcu_read_lock();
proxy = task_nsproxy(p);
+#endif
if (proxy) {
pid_ns = lttng_get_proxy_pid_ns(proxy);
do {
trace_lttng_statedump_process_state(session,
p, type, mode, submode, status, NULL);
}
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
+ LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0))
+ /* (nothing) */
+#else
rcu_read_unlock();
+#endif
}
static
static
int do_lttng_statedump(struct lttng_session *session)
{
- int cpu;
+ int cpu, ret;
trace_lttng_statedump_start(session);
- lttng_enumerate_process_states(session);
- lttng_enumerate_file_descriptors(session);
- /* FIXME lttng_enumerate_vm_maps(session); */
- lttng_list_interrupts(session);
- lttng_enumerate_network_ip_interface(session);
+ ret = lttng_enumerate_process_states(session);
+ if (ret)
+ return ret;
+ ret = lttng_enumerate_file_descriptors(session);
+ if (ret)
+ return ret;
+ /*
+ * FIXME
+ * ret = lttng_enumerate_vm_maps(session);
+ * if (ret)
+ * return ret;
+ */
+ ret = lttng_list_interrupts(session);
+ if (ret)
+ return ret;
+ ret = lttng_enumerate_network_ip_interface(session);
+ if (ret)
+ return ret;
+ ret = lttng_enumerate_block_devices(session);
+ switch (ret) {
+ case -ENOSYS:
+ printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
+ break;
+ default:
+ return ret;
+ }
/* TODO lttng_dump_idt_table(session); */
/* TODO lttng_dump_softirq_vec(session); */
static
int __init lttng_statedump_init(void)
{
- return wrapper_lttng_fixup_sig(THIS_MODULE);
+ /*
+ * Allow module to load even if the fixup cannot be done. This
+ * will allow seemless transition when the underlying issue fix
+ * is merged into the Linux kernel, and when tracepoint.c
+ * "tracepoint_module_notify" is turned into a static function.
+ */
+ (void) wrapper_lttng_fixup_sig(THIS_MODULE);
+ return 0;
}
module_init(lttng_statedump_init);
+static
+void __exit lttng_statedump_exit(void)
+{
+}
+
+module_exit(lttng_statedump_exit);
+
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Jean-Hugues Deschenes");
MODULE_DESCRIPTION("Linux Trace Toolkit Next Generation Statedump");
+MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
+ __stringify(LTTNG_MODULES_MINOR_VERSION) "."
+ __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
+ LTTNG_MODULES_EXTRAVERSION);
projects / lttng-modules.git / blobdiff