* stpd: Remove directory.
* relayfs: Remove directory.
2007-03-14 Martin Hunt <hunt@redhat.com>
-
+ * stpd: Remove directory.
+ * relayfs: Remove directory.
+
+2007-03-14 Martin Hunt <hunt@redhat.com>
* bench2/bench.rb: Updated to work with new transport
and new itest.c.
* bench2/Makefile: Updated for new itest.c
+++ /dev/null
-2005-10-19 Tom Zanussi <zanussi@us.ibm.com>
-
- * inode.c (relayfs_remove): Applied patch
- [PATCH 2.6.13-rc6-mm2] relayfs: relayfs_remove fix
-
-2005-10-14 Tom Zanussi <zanussi@us.ibm.com>
-
- * buffers.c (relay_alloc_buf): Applied patch
- [PATCH 2.6.14-rc4] relayfs: fix bogus param value in call to vmap
-
-2005-05-17 Martin Hunt <hunt@redhat.com>
-
- * relay.c (relay_switch_subbuf): Applied patch
- [PATCH 2.6.12-rc1-mm2] relayfs: properly handle oversized events
-
-2005-04-11 Martin Hunt <hunt@redhat.com>
-
- * inode.c: Latest kernels have modified backing_dev_info. Detect
- newer version and set appropriately.
-
-
+++ /dev/null
-#
-# relayfs Makefile
-#
-
-PWD := $(shell pwd)
-KDIR := /lib/modules/$(shell uname -r)/build
-
-relayfs-y := relay.o inode.o buffers.o
-
-obj-m += relayfs.o
-
-default:
- $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
-
-clean:
- /bin/rm -rf *.o *.ko *~ *.mod.c .*.cmd .tmp_versions
-
+++ /dev/null
-/*
- * RelayFS buffer management code.
- *
- * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
- * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
- *
- * This file is released under the GPL.
- */
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include "linux/relayfs_fs.h"
-#include "relay.h"
-#include "buffers.h"
-
-/*
- * close() vm_op implementation for relayfs file mapping.
- */
-static void relay_file_mmap_close(struct vm_area_struct *vma)
-{
- struct rchan_buf *buf = vma->vm_private_data;
- buf->chan->cb->buf_unmapped(buf, vma->vm_file);
-}
-
-/*
- * nopage() vm_op implementation for relayfs file mapping.
- */
-static struct page *relay_buf_nopage(struct vm_area_struct *vma,
- unsigned long address,
- int *type)
-{
- struct page *page;
- struct rchan_buf *buf = vma->vm_private_data;
- unsigned long offset = address - vma->vm_start;
-
- if (address > vma->vm_end)
- return NOPAGE_SIGBUS; /* Disallow mremap */
- if (!buf)
- return NOPAGE_OOM;
-
- page = vmalloc_to_page(buf->start + offset);
- if (!page)
- return NOPAGE_OOM;
- get_page(page);
-
- if (type)
- *type = VM_FAULT_MINOR;
-
- return page;
-}
-
-/*
- * vm_ops for relay file mappings.
- */
-static struct vm_operations_struct relay_file_mmap_ops = {
- .nopage = relay_buf_nopage,
- .close = relay_file_mmap_close,
-};
-
-/**
- * relay_mmap_buf: - mmap channel buffer to process address space
- * @buf: relay channel buffer
- * @vma: vm_area_struct describing memory to be mapped
- *
- * Returns 0 if ok, negative on error
- *
- * Caller should already have grabbed mmap_sem.
- */
-int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
-{
- unsigned long length = vma->vm_end - vma->vm_start;
- struct file *filp = vma->vm_file;
-
- if (!buf)
- return -EBADF;
-
- if (length != (unsigned long)buf->chan->alloc_size)
- return -EINVAL;
-
- vma->vm_ops = &relay_file_mmap_ops;
- vma->vm_private_data = buf;
- buf->chan->cb->buf_mapped(buf, filp);
-
- return 0;
-}
-
-/**
- * relay_alloc_buf - allocate a channel buffer
- * @buf: the buffer struct
- * @size: total size of the buffer
- *
- * Returns a pointer to the resulting buffer, NULL if unsuccessful
- */
-static void *relay_alloc_buf(struct rchan_buf *buf, unsigned long size)
-{
- void *mem;
- int i, j, n_pages;
-
- size = PAGE_ALIGN(size);
- n_pages = size >> PAGE_SHIFT;
-
- buf->page_array = kcalloc(n_pages, sizeof(struct page *), GFP_KERNEL);
- if (!buf->page_array)
- return NULL;
-
- for (i = 0; i < n_pages; i++) {
- buf->page_array[i] = alloc_page(GFP_KERNEL);
- if (unlikely(!buf->page_array[i]))
- goto depopulate;
- }
- mem = vmap(buf->page_array, n_pages, VM_MAP, PAGE_KERNEL);
- if (!mem)
- goto depopulate;
-
- memset(mem, 0, size);
- buf->page_count = n_pages;
- return mem;
-
-depopulate:
- for (j = 0; j < i; j++)
- __free_page(buf->page_array[j]);
- kfree(buf->page_array);
- return NULL;
-}
-
-/**
- * relay_create_buf - allocate and initialize a channel buffer
- * @alloc_size: size of the buffer to allocate
- * @n_subbufs: number of sub-buffers in the channel
- *
- * Returns channel buffer if successful, NULL otherwise
- */
-struct rchan_buf *relay_create_buf(struct rchan *chan)
-{
- struct rchan_buf *buf = kcalloc(1, sizeof(struct rchan_buf), GFP_KERNEL);
- if (!buf)
- return NULL;
-
- buf->padding = kmalloc(chan->n_subbufs * sizeof(unsigned *), GFP_KERNEL);
- if (!buf->padding)
- goto free_buf;
-
- buf->commit = kmalloc(chan->n_subbufs * sizeof(unsigned *), GFP_KERNEL);
- if (!buf->commit)
- goto free_buf;
-
- buf->start = relay_alloc_buf(buf, chan->alloc_size);
- if (!buf->start)
- goto free_buf;
-
- buf->chan = chan;
- kref_get(&buf->chan->kref);
- return buf;
-
-free_buf:
- kfree(buf->commit);
- kfree(buf->padding);
- kfree(buf);
- return NULL;
-}
-
-/**
- * relay_destroy_buf - destroy an rchan_buf struct and associated buffer
- * @buf: the buffer struct
- */
-void relay_destroy_buf(struct rchan_buf *buf)
-{
- struct rchan *chan = buf->chan;
- int i;
-
- if (likely(buf->start)) {
- vunmap(buf->start);
- for (i = 0; i < buf->page_count; i++)
- __free_page(buf->page_array[i]);
- kfree(buf->page_array);
- }
- kfree(buf->padding);
- kfree(buf->commit);
- kfree(buf);
- kref_put(&chan->kref, relay_destroy_channel);
-}
-
-/**
- * relay_remove_buf - remove a channel buffer
- *
- * Removes the file from the relayfs fileystem, which also frees the
- * rchan_buf_struct and the channel buffer. Should only be called from
- * kref_put().
- */
-void relay_remove_buf(struct kref *kref)
-{
- struct rchan_buf *buf = container_of(kref, struct rchan_buf, kref);
- relayfs_remove(buf->dentry);
-}
+++ /dev/null
-#ifndef _BUFFERS_H
-#define _BUFFERS_H
-
-/* This inspired by rtai/shmem */
-#define FIX_SIZE(x) (((x) - 1) & PAGE_MASK) + PAGE_SIZE
-
-extern int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma);
-extern struct rchan_buf *relay_create_buf(struct rchan *chan);
-extern void relay_destroy_buf(struct rchan_buf *buf);
-extern void relay_remove_buf(struct kref *kref);
-
-#endif/* _BUFFERS_H */
+++ /dev/null
-/*
- * VFS-related code for RelayFS, a high-speed data relay filesystem.
- *
- * Copyright (C) 2003-2005 - Tom Zanussi <zanussi@us.ibm.com>, IBM Corp
- * Copyright (C) 2003-2005 - Karim Yaghmour <karim@opersys.com>
- *
- * Based on ramfs, Copyright (C) 2002 - Linus Torvalds
- *
- * This file is released under the GPL.
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/pagemap.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/backing-dev.h>
-#include <linux/namei.h>
-#include <linux/poll.h>
-#include "linux/relayfs_fs.h"
-#include "relay.h"
-#include "buffers.h"
-
-#define RELAYFS_MAGIC 0xF0B4A981
-
-static struct vfsmount * relayfs_mount;
-static int relayfs_mount_count;
-static kmem_cache_t * relayfs_inode_cachep;
-
-static struct backing_dev_info relayfs_backing_dev_info = {
- .ra_pages = 0, /* No readahead */
-#ifdef BDI_CAP_NO_ACCT_DIRTY
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
-#else
- .memory_backed = 1, /* Does not contribute to dirty memory */
-#endif
-};
-
-static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
- struct rchan *chan)
-{
- struct rchan_buf *buf = NULL;
- struct inode *inode;
-
- if (S_ISREG(mode)) {
- BUG_ON(!chan);
- buf = relay_create_buf(chan);
- if (!buf)
- return NULL;
- }
-
- inode = new_inode(sb);
- if (!inode) {
- relay_destroy_buf(buf);
- return NULL;
- }
-
- inode->i_mode = mode;
- inode->i_uid = 0;
- inode->i_gid = 0;
- inode->i_blksize = PAGE_CACHE_SIZE;
- inode->i_blocks = 0;
- inode->i_mapping->backing_dev_info = &relayfs_backing_dev_info;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- switch (mode & S_IFMT) {
- case S_IFREG:
- inode->i_fop = &relayfs_file_operations;
- RELAYFS_I(inode)->buf = buf;
- break;
- case S_IFDIR:
- inode->i_op = &simple_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
-
- /* directory inodes start off with i_nlink == 2 (for "." entry) */
- inode->i_nlink++;
- break;
- default:
- break;
- }
-
- return inode;
-}
-
-/**
- * relayfs_create_entry - create a relayfs directory or file
- * @name: the name of the file to create
- * @parent: parent directory
- * @mode: mode
- * @chan: relay channel associated with the file
- *
- * Returns the new dentry, NULL on failure
- *
- * Creates a file or directory with the specifed permissions.
- */
-static struct dentry *relayfs_create_entry(const char *name,
- struct dentry *parent,
- int mode,
- struct rchan *chan)
-{
- struct qstr qname;
- struct dentry *d;
- struct inode *inode;
- int error = 0;
-
- BUG_ON(!name || !(S_ISREG(mode) || S_ISDIR(mode)));
-
- error = simple_pin_fs("relayfs", &relayfs_mount, &relayfs_mount_count);
- if (error) {
- printk(KERN_ERR "Couldn't mount relayfs: errcode %d\n", error);
- return NULL;
- }
-
- qname.name = name;
- qname.len = strlen(name);
- qname.hash = full_name_hash(name, qname.len);
-
- if (!parent && relayfs_mount && relayfs_mount->mnt_sb)
- parent = relayfs_mount->mnt_sb->s_root;
-
- if (!parent) {
- simple_release_fs(&relayfs_mount, &relayfs_mount_count);
- return NULL;
- }
-
- parent = dget(parent);
- down(&parent->d_inode->i_sem);
- d = lookup_hash(&qname, parent);
- if (IS_ERR(d)) {
- d = NULL;
- goto release_mount;
- }
-
- if (d->d_inode) {
- d = NULL;
- goto release_mount;
- }
-
- inode = relayfs_get_inode(parent->d_inode->i_sb, mode, chan);
- if (!inode) {
- d = NULL;
- goto release_mount;
- }
-
- d_instantiate(d, inode);
- dget(d); /* Extra count - pin the dentry in core */
-
- if (S_ISDIR(mode))
- parent->d_inode->i_nlink++;
-
- goto exit;
-
-release_mount:
- simple_release_fs(&relayfs_mount, &relayfs_mount_count);
-
-exit:
- up(&parent->d_inode->i_sem);
- dput(parent);
- return d;
-}
-
-/**
- * relayfs_create_file - create a file in the relay filesystem
- * @name: the name of the file to create
- * @parent: parent directory
- * @mode: mode, if not specied the default perms are used
- * @chan: channel associated with the file
- *
- * Returns file dentry if successful, NULL otherwise.
- *
- * The file will be created user r on behalf of current user.
- */
-struct dentry *relayfs_create_file(const char *name, struct dentry *parent,
- int mode, struct rchan *chan)
-{
- if (!mode)
- mode = S_IRUSR;
- mode = (mode & S_IALLUGO) | S_IFREG;
-
- return relayfs_create_entry(name, parent, mode, chan);
-}
-
-/**
- * relayfs_create_dir - create a directory in the relay filesystem
- * @name: the name of the directory to create
- * @parent: parent directory, NULL if parent should be fs root
- *
- * Returns directory dentry if successful, NULL otherwise.
- *
- * The directory will be created world rwx on behalf of current user.
- */
-struct dentry *relayfs_create_dir(const char *name, struct dentry *parent)
-{
- int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
- return relayfs_create_entry(name, parent, mode, NULL);
-}
-
-/**
- * relayfs_remove - remove a file or directory in the relay filesystem
- * @dentry: file or directory dentry
- *
- * Returns 0 if successful, negative otherwise.
- */
-int relayfs_remove(struct dentry *dentry)
-{
- struct dentry *parent;
- int error = 0;
-
- if (!dentry)
- return -EINVAL;
- parent = dentry->d_parent;
- if (!parent)
- return -EINVAL;
-
- parent = dget(parent);
- down(&parent->d_inode->i_sem);
- if (dentry->d_inode) {
- if (S_ISDIR(dentry->d_inode->i_mode))
- error = simple_rmdir(parent->d_inode, dentry);
- else
- error = simple_unlink(parent->d_inode, dentry);
- if (!error)
- d_delete(dentry);
- }
- if (!error)
- dput(dentry);
- up(&parent->d_inode->i_sem);
- dput(parent);
-
- if (!error)
- simple_release_fs(&relayfs_mount, &relayfs_mount_count);
-
- return error;
-}
-
-/**
- * relayfs_remove_dir - remove a directory in the relay filesystem
- * @dentry: directory dentry
- *
- * Returns 0 if successful, negative otherwise.
- */
-int relayfs_remove_dir(struct dentry *dentry)
-{
- return relayfs_remove(dentry);
-}
-
-/**
- * relayfs_open - open file op for relayfs files
- * @inode: the inode
- * @filp: the file
- *
- * Increments the channel buffer refcount.
- */
-int relayfs_open(struct inode *inode, struct file *filp)
-{
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
- kref_get(&buf->kref);
-
- return 0;
-}
-
-/**
- * relayfs_mmap - mmap file op for relayfs files
- * @filp: the file
- * @vma: the vma describing what to map
- *
- * Calls upon relay_mmap_buf to map the file into user space.
- */
-int relayfs_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- struct inode *inode = filp->f_dentry->d_inode;
- return relay_mmap_buf(RELAYFS_I(inode)->buf, vma);
-}
-
-/**
- * relayfs_poll - poll file op for relayfs files
- * @filp: the file
- * @wait: poll table
- *
- * Poll implemention.
- */
-unsigned int relayfs_poll(struct file *filp, poll_table *wait)
-{
- unsigned int mask = 0;
- struct inode *inode = filp->f_dentry->d_inode;
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
-
- if (buf->finalized)
- return POLLERR;
-
- if (filp->f_mode & FMODE_READ) {
- poll_wait(filp, &buf->read_wait, wait);
- if (!relay_buf_empty(buf))
- mask |= POLLIN | POLLRDNORM;
- }
-
- return mask;
-}
-
-/**
- * relayfs_release - release file op for relayfs files
- * @inode: the inode
- * @filp: the file
- *
- * Decrements the channel refcount, as the filesystem is
- * no longer using it.
- */
-int relayfs_release(struct inode *inode, struct file *filp)
-{
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
- kref_put(&buf->kref, relay_remove_buf);
-
- return 0;
-}
-
-/**
- * relayfs alloc_inode() implementation
- */
-static struct inode *relayfs_alloc_inode(struct super_block *sb)
-{
- struct relayfs_inode_info *p = kmem_cache_alloc(relayfs_inode_cachep, SLAB_KERNEL);
- if (!p)
- return NULL;
- p->buf = NULL;
-
- return &p->vfs_inode;
-}
-
-/**
- * relayfs destroy_inode() implementation
- */
-static void relayfs_destroy_inode(struct inode *inode)
-{
- if (RELAYFS_I(inode)->buf)
- relay_destroy_buf(RELAYFS_I(inode)->buf);
-
- kmem_cache_free(relayfs_inode_cachep, RELAYFS_I(inode));
-}
-
-static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
-{
- struct relayfs_inode_info *i = p;
- if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
- inode_init_once(&i->vfs_inode);
-}
-
-struct file_operations relayfs_file_operations = {
- .open = relayfs_open,
- .poll = relayfs_poll,
- .mmap = relayfs_mmap,
- .release = relayfs_release,
-};
-
-static struct super_operations relayfs_ops = {
- .statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
- .alloc_inode = relayfs_alloc_inode,
- .destroy_inode = relayfs_destroy_inode,
-};
-
-static int relayfs_fill_super(struct super_block * sb, void * data, int silent)
-{
- struct inode *inode;
- struct dentry *root;
- int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
-
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = RELAYFS_MAGIC;
- sb->s_op = &relayfs_ops;
- inode = relayfs_get_inode(sb, mode, NULL);
-
- if (!inode)
- return -ENOMEM;
-
- root = d_alloc_root(inode);
- if (!root) {
- iput(inode);
- return -ENOMEM;
- }
- sb->s_root = root;
-
- return 0;
-}
-
-static struct super_block * relayfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
-{
- return get_sb_single(fs_type, flags, data, relayfs_fill_super);
-}
-
-static struct file_system_type relayfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "relayfs",
- .get_sb = relayfs_get_sb,
- .kill_sb = kill_litter_super,
-};
-
-static int __init init_relayfs_fs(void)
-{
- int err;
-
- relayfs_inode_cachep = kmem_cache_create("relayfs_inode_cache",
- sizeof(struct relayfs_inode_info), 0,
- 0, init_once, NULL);
- if (!relayfs_inode_cachep)
- return -ENOMEM;
-
- err = register_filesystem(&relayfs_fs_type);
- if (err)
- kmem_cache_destroy(relayfs_inode_cachep);
-
- return err;
-}
-
-static void __exit exit_relayfs_fs(void)
-{
- unregister_filesystem(&relayfs_fs_type);
- kmem_cache_destroy(relayfs_inode_cachep);
-}
-
-module_init(init_relayfs_fs)
-module_exit(exit_relayfs_fs)
-
-EXPORT_SYMBOL_GPL(relayfs_open);
-EXPORT_SYMBOL_GPL(relayfs_poll);
-EXPORT_SYMBOL_GPL(relayfs_mmap);
-EXPORT_SYMBOL_GPL(relayfs_release);
-EXPORT_SYMBOL_GPL(relayfs_file_operations);
-EXPORT_SYMBOL_GPL(relayfs_create_dir);
-EXPORT_SYMBOL_GPL(relayfs_remove_dir);
-
-MODULE_AUTHOR("Tom Zanussi <zanussi@us.ibm.com> and Karim Yaghmour <karim@opersys.com>");
-MODULE_DESCRIPTION("Relay Filesystem");
-MODULE_LICENSE("GPL");
-
+++ /dev/null
-/*
- * linux/include/linux/relayfs_fs.h
- *
- * Copyright (C) 2002, 2003 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
- * Copyright (C) 1999, 2000, 2001, 2002 - Karim Yaghmour (karim@opersys.com)
- *
- * RelayFS definitions and declarations
- */
-
-#ifndef _LINUX_RELAYFS_FS_H
-#define _LINUX_RELAYFS_FS_H
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/list.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/kref.h>
-
-/*
- * Tracks changes to rchan_buf struct
- */
-#define RELAYFS_CHANNEL_VERSION 3
-
-/*
- * Per-cpu relay channel buffer
- */
-struct rchan_buf
-{
- void *start; /* start of channel buffer */
- void *data; /* start of current sub-buffer */
- unsigned offset; /* current offset into sub-buffer */
- atomic_t subbufs_produced; /* count of sub-buffers produced */
- atomic_t subbufs_consumed; /* count of sub-buffers consumed */
- atomic_t unfull; /* state has gone from full to not */
- struct rchan *chan; /* associated channel */
- wait_queue_head_t read_wait; /* reader wait queue */
- struct work_struct wake_readers; /* reader wake-up work struct */
- struct dentry *dentry; /* channel file dentry */
- struct kref kref; /* channel buffer refcount */
- struct page **page_array; /* array of current buffer pages */
- int page_count; /* number of current buffer pages */
- unsigned *padding; /* padding counts per sub-buffer */
- unsigned *commit; /* commit counts per sub-buffer */
- int finalized; /* buffer has been finalized */
-} ____cacheline_aligned;
-
-/*
- * Relay channel data structure
- */
-struct rchan
-{
- u32 version; /* the version of this struct */
- unsigned subbuf_size; /* sub-buffer size */
- unsigned n_subbufs; /* number of sub-buffers per buffer */
- unsigned alloc_size; /* total buffer size allocated */
- int overwrite; /* overwrite buffer when full? */
- struct rchan_callbacks *cb; /* client callbacks */
- struct kref kref; /* channel refcount */
- void *private_data; /* for user-defined data */
- struct rchan_buf *buf[NR_CPUS]; /* per-cpu channel buffers */
-};
-
-/*
- * Relayfs inode
- */
-struct relayfs_inode_info
-{
- struct inode vfs_inode;
- struct rchan_buf *buf;
-};
-
-static inline struct relayfs_inode_info *RELAYFS_I(struct inode *inode)
-{
- return container_of(inode, struct relayfs_inode_info, vfs_inode);
-}
-
-/*
- * Relay channel client callbacks
- */
-struct rchan_callbacks
-{
- /*
- * subbuf_start - called on buffer-switch to a new sub-buffer
- * @buf: the channel buffer containing the new sub-buffer
- * @subbuf: the start of the new sub-buffer
- * @prev_subbuf_idx: the previous sub-buffer's index
- * @prev_subbuf: the start of the previous sub-buffer
- *
- * The client should return the number of bytes it reserves at
- * the beginning of the sub-buffer, 0 if none.
- *
- * NOTE: subbuf_start will also be invoked when the buffer is
- * created, so that the first sub-buffer can be initialized
- * if necessary. In this case, prev_subbuf will be NULL.
- */
- int (*subbuf_start) (struct rchan_buf *buf,
- void *subbuf,
- unsigned prev_subbuf_idx,
- void *prev_subbuf);
-
- /*
- * deliver - deliver a guaranteed full sub-buffer to client
- * @buf: the channel buffer containing the sub-buffer
- * @subbuf_idx: the sub-buffer's index
- * @subbuf: the start of the new sub-buffer
- *
- * Only works if relay_commit is also used
- */
- void (*deliver) (struct rchan_buf *buf,
- unsigned subbuf_idx,
- void *subbuf);
-
- /*
- * buf_mapped - relayfs buffer mmap notification
- * @buf: the channel buffer
- * @filp: relayfs file pointer
- *
- * Called when a relayfs file is successfully mmapped
- */
- void (*buf_mapped)(struct rchan_buf *buf,
- struct file *filp);
-
- /*
- * buf_unmapped - relayfs buffer unmap notification
- * @buf: the channel buffer
- * @filp: relayfs file pointer
- *
- * Called when a relayfs file is successfully unmapped
- */
- void (*buf_unmapped)(struct rchan_buf *buf,
- struct file *filp);
-
- /*
- * buf_full - relayfs buffer full notification
- * @buf: the channel channel buffer
- * @subbuf_idx: the current sub-buffer's index
- * @subbuf: the start of the current sub-buffer
- *
- * Called when a relayfs buffer becomes full
- */
- void (*buf_full)(struct rchan_buf *buf,
- unsigned subbuf_idx,
- void *subbuf);
-};
-
-/*
- * relayfs kernel API, fs/relayfs/relay.c
- */
-
-struct rchan *relay_open(const char *base_filename,
- struct dentry *parent,
- unsigned subbuf_size,
- unsigned n_subbufs,
- int overwrite,
- struct rchan_callbacks *cb);
-extern void relay_close(struct rchan *chan);
-extern void relay_flush(struct rchan *chan);
-extern void relay_subbufs_consumed(struct rchan *chan,
- int cpu,
- int subbufs_consumed);
-extern void relay_reset(struct rchan *chan);
-extern unsigned relay_switch_subbuf(struct rchan_buf *buf,
- unsigned length);
-extern void relay_commit(struct rchan_buf *buf,
- void *reserved,
- unsigned count);
-extern struct dentry *relayfs_create_dir(const char *name,
- struct dentry *parent);
-extern int relayfs_remove_dir(struct dentry *dentry);
-
-/**
- * relay_write - write data into the channel
- * @chan: relay channel
- * @data: data to be written
- * @length: number of bytes to write
- *
- * Writes data into the current cpu's channel buffer.
- *
- * Protects the buffer by disabling interrupts. Use this
- * if you might be logging from interrupt context. Try
- * __relay_write() if you know you won't be logging from
- * interrupt context.
- */
-static inline void relay_write(struct rchan *chan,
- const void *data,
- unsigned length)
-{
- unsigned long flags;
- struct rchan_buf *buf;
-
- local_irq_save(flags);
- buf = chan->buf[smp_processor_id()];
- if (unlikely(buf->offset + length > chan->subbuf_size))
- length = relay_switch_subbuf(buf, length);
- memcpy(buf->data + buf->offset, data, length);
- buf->offset += length;
- local_irq_restore(flags);
-}
-
-/**
- * __relay_write - write data into the channel
- * @chan: relay channel
- * @data: data to be written
- * @length: number of bytes to write
- *
- * Writes data into the current cpu's channel buffer.
- *
- * Protects the buffer by disabling preemption. Use
- * relay_write() if you might be logging from interrupt
- * context.
- */
-static inline void __relay_write(struct rchan *chan,
- const void *data,
- unsigned length)
-{
- struct rchan_buf *buf;
-
- buf = chan->buf[get_cpu()];
- if (unlikely(buf->offset + length > buf->chan->subbuf_size))
- length = relay_switch_subbuf(buf, length);
- memcpy(buf->data + buf->offset, data, length);
- buf->offset += length;
- put_cpu();
-}
-
-/**
- * relay_reserve - reserve slot in channel buffer
- * @chan: relay channel
- * @length: number of bytes to reserve
- *
- * Returns pointer to reserved slot, NULL if full.
- *
- * Reserves a slot in the current cpu's channel buffer.
- * Does not protect the buffer at all - caller must provide
- * appropriate synchronization.
- */
-static inline void *relay_reserve(struct rchan *chan, unsigned length)
-{
- void *reserved;
- struct rchan_buf *buf = chan->buf[smp_processor_id()];
-
- if (unlikely(buf->offset + length > buf->chan->subbuf_size)) {
- length = relay_switch_subbuf(buf, length);
- if (!length)
- return NULL;
- }
- reserved = buf->data + buf->offset;
- buf->offset += length;
-
- return reserved;
-}
-
-/*
- * exported relayfs file operations, fs/relayfs/inode.c
- */
-
-extern struct file_operations relayfs_file_operations;
-extern int relayfs_open(struct inode *inode, struct file *filp);
-extern unsigned int relayfs_poll(struct file *filp, poll_table *wait);
-extern int relayfs_mmap(struct file *filp, struct vm_area_struct *vma);
-extern int relayfs_release(struct inode *inode, struct file *filp);
-
-#endif /* _LINUX_RELAYFS_FS_H */
-
+++ /dev/null
-/*
- * Public API and common code for RelayFS.
- *
- * See Documentation/filesystems/relayfs.txt for an overview of relayfs.
- *
- * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
- * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
- *
- * This file is released under the GPL.
- */
-
-#include <linux/errno.h>
-#include <linux/stddef.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include "linux/relayfs_fs.h"
-#include "relay.h"
-#include "buffers.h"
-
-/**
- * relay_buf_empty - boolean, is the channel buffer empty?
- * @buf: channel buffer
- *
- * Returns 1 if the buffer is empty, 0 otherwise.
- */
-int relay_buf_empty(struct rchan_buf *buf)
-{
- int produced = atomic_read(&buf->subbufs_produced);
- int consumed = atomic_read(&buf->subbufs_consumed);
-
- return (produced - consumed) ? 0 : 1;
-}
-
-/**
- * relay_buf_full - boolean, is the channel buffer full?
- * @buf: channel buffer
- *
- * Returns 1 if the buffer is full, 0 otherwise.
- */
-static inline int relay_buf_full(struct rchan_buf *buf)
-{
- int produced, consumed;
-
- if (buf->chan->overwrite)
- return 0;
-
- produced = atomic_read(&buf->subbufs_produced);
- consumed = atomic_read(&buf->subbufs_consumed);
-
- return (produced - consumed > buf->chan->n_subbufs - 1) ? 1 : 0;
-}
-
-/*
- * High-level relayfs kernel API and associated functions.
- */
-
-/*
- * rchan_callback implementations defining default channel behavior. Used
- * in place of corresponding NULL values in client callback struct.
- */
-
-/*
- * subbuf_start() default callback. Does nothing.
- */
-static int subbuf_start_default_callback (struct rchan_buf *buf,
- void *subbuf,
- unsigned prev_subbuf_idx,
- void *prev_subbuf)
-{
- return 0;
-}
-
-/*
- * deliver() default callback. Does nothing.
- */
-static void deliver_default_callback (struct rchan_buf *buf,
- unsigned subbuf_idx,
- void *subbuf)
-{
-}
-
-/*
- * buf_mapped() default callback. Does nothing.
- */
-static void buf_mapped_default_callback(struct rchan_buf *buf,
- struct file *filp)
-{
-}
-
-/*
- * buf_unmapped() default callback. Does nothing.
- */
-static void buf_unmapped_default_callback(struct rchan_buf *buf,
- struct file *filp)
-{
-}
-
-/*
- * buf_full() default callback. Does nothing.
- */
-static void buf_full_default_callback(struct rchan_buf *buf,
- unsigned subbuf_idx,
- void *subbuf)
-{
-}
-
-/* relay channel default callbacks */
-static struct rchan_callbacks default_channel_callbacks = {
- .subbuf_start = subbuf_start_default_callback,
- .deliver = deliver_default_callback,
- .buf_mapped = buf_mapped_default_callback,
- .buf_unmapped = buf_unmapped_default_callback,
- .buf_full = buf_full_default_callback,
-};
-
-/**
- * wakeup_readers - wake up readers waiting on a channel
- * @private: the channel buffer
- *
- * This is the work function used to defer reader waking. The
- * reason waking is deferred is that calling directly from write
- * causes problems if you're writing from say the scheduler.
- */
-static void wakeup_readers(void *private)
-{
- struct rchan_buf *buf = private;
- wake_up_interruptible(&buf->read_wait);
-}
-
-/**
- * get_next_subbuf - return next sub-buffer within channel buffer
- * @buf: channel buffer
- */
-static inline void *get_next_subbuf(struct rchan_buf *buf)
-{
- void *next = buf->data + buf->chan->subbuf_size;
- if (next >= buf->start + buf->chan->subbuf_size * buf->chan->n_subbufs)
- next = buf->start;
-
- return next;
-}
-
-/**
- * __relay_reset - reset a channel buffer
- * @buf: the channel buffer
- * @init: 1 if this is a first-time initialization
- *
- * See relay_reset for description of effect.
- */
-static inline void __relay_reset(struct rchan_buf *buf, int init)
-{
- int i;
-
- if (init) {
- init_waitqueue_head(&buf->read_wait);
- kref_init(&buf->kref);
- INIT_WORK(&buf->wake_readers, NULL, NULL);
- } else {
- cancel_delayed_work(&buf->wake_readers);
- flush_scheduled_work();
- }
-
- atomic_set(&buf->subbufs_produced, 0);
- atomic_set(&buf->subbufs_consumed, 0);
- atomic_set(&buf->unfull, 0);
- buf->finalized = 0;
- buf->data = buf->start;
- buf->offset = 0;
-
- for (i = 0; i < buf->chan->n_subbufs; i++) {
- buf->padding[i] = 0;
- buf->commit[i] = 0;
- }
-
- buf->offset = buf->chan->cb->subbuf_start(buf, buf->data, 0, NULL);
- buf->commit[0] = buf->offset;
-}
-
-/**
- * relay_reset - reset the channel
- * @chan: the channel
- *
- * Returns 0 if successful, negative if not.
- *
- * This has the effect of erasing all data from all channel buffers
- * and restarting the channel in its initial state. The buffers
- * are not freed, so any mappings are still in effect.
- *
- * NOTE: Care should be taken that the channel isn't actually
- * being used by anything when this call is made.
- */
-void relay_reset(struct rchan *chan)
-{
- int i;
-
- if (!chan)
- return;
-
- for (i = 0; i < NR_CPUS; i++) {
- if (!chan->buf[i])
- continue;
- __relay_reset(chan->buf[i], 0);
- }
-}
-
-/**
- * relay_open_buf - create a new channel buffer in relayfs
- *
- * Internal - used by relay_open().
- */
-static struct rchan_buf *relay_open_buf(struct rchan *chan,
- const char *filename,
- struct dentry *parent)
-{
- struct rchan_buf *buf;
- struct dentry *dentry;
-
- /* Create file in fs */
- dentry = relayfs_create_file(filename, parent, S_IRUSR, chan);
- if (!dentry)
- return NULL;
-
- buf = RELAYFS_I(dentry->d_inode)->buf;
- buf->dentry = dentry;
- __relay_reset(buf, 1);
-
- return buf;
-}
-
-/**
- * relay_close_buf - close a channel buffer
- * @buf: channel buffer
- *
- * Marks the buffer finalized and restores the default callbacks.
- * The channel buffer and channel buffer data structure are then freed
- * automatically when the last reference is given up.
- */
-static inline void relay_close_buf(struct rchan_buf *buf)
-{
- buf->finalized = 1;
- buf->chan->cb = &default_channel_callbacks;
- cancel_delayed_work(&buf->wake_readers);
- flush_scheduled_work();
- kref_put(&buf->kref, relay_remove_buf);
-}
-
-static inline void setup_callbacks(struct rchan *chan,
- struct rchan_callbacks *cb)
-{
- if (!cb) {
- chan->cb = &default_channel_callbacks;
- return;
- }
-
- if (!cb->subbuf_start)
- cb->subbuf_start = subbuf_start_default_callback;
- if (!cb->deliver)
- cb->deliver = deliver_default_callback;
- if (!cb->buf_mapped)
- cb->buf_mapped = buf_mapped_default_callback;
- if (!cb->buf_unmapped)
- cb->buf_unmapped = buf_unmapped_default_callback;
- if (!cb->buf_full)
- cb->buf_full = buf_full_default_callback;
- chan->cb = cb;
-}
-
-/**
- * relay_open - create a new relayfs channel
- * @base_filename: base name of files to create
- * @parent: dentry of parent directory, NULL for root directory
- * @subbuf_size: size of sub-buffers
- * @n_subbufs: number of sub-buffers
- * @overwrite: overwrite buffer when full?
- * @cb: client callback functions
- *
- * Returns channel pointer if successful, NULL otherwise.
- *
- * Creates a channel buffer for each cpu using the sizes and
- * attributes specified. The created channel buffer files
- * will be named base_filename0...base_filenameN-1. File
- * permissions will be S_IRUSR.
- */
-struct rchan *relay_open(const char *base_filename,
- struct dentry *parent,
- unsigned subbuf_size,
- unsigned n_subbufs,
- int overwrite,
- struct rchan_callbacks *cb)
-{
- int i;
- struct rchan *chan;
- char *tmpname;
-
- if (!base_filename)
- return NULL;
-
- if (!(subbuf_size && n_subbufs))
- return NULL;
-
- chan = kcalloc(1, sizeof(struct rchan), GFP_KERNEL);
- if (!chan)
- return NULL;
-
- chan->version = RELAYFS_CHANNEL_VERSION;
- chan->overwrite = overwrite;
- chan->n_subbufs = n_subbufs;
- chan->subbuf_size = subbuf_size;
- chan->alloc_size = FIX_SIZE(subbuf_size * n_subbufs);
- setup_callbacks(chan, cb);
- kref_init(&chan->kref);
-
- tmpname = kmalloc(NAME_MAX + 1, GFP_KERNEL);
- if (!tmpname)
- goto free_chan;
-
- for_each_online_cpu(i) {
- sprintf(tmpname, "%s%d", base_filename, i);
- chan->buf[i] = relay_open_buf(chan, tmpname, parent);
- if (!chan->buf[i])
- goto free_bufs;
- }
-
- kfree(tmpname);
- return chan;
-
-free_bufs:
- for (i = 0; i < NR_CPUS; i++) {
- if (!chan->buf[i])
- break;
- relay_close_buf(chan->buf[i]);
- }
- kfree(tmpname);
-
-free_chan:
- kref_put(&chan->kref, relay_destroy_channel);
- return NULL;
-}
-
-/**
- * deliver_check - deliver a guaranteed full sub-buffer if applicable
- */
-static inline void deliver_check(struct rchan_buf *buf,
- unsigned subbuf_idx)
-{
- void *subbuf;
- unsigned full = buf->chan->subbuf_size - buf->padding[subbuf_idx];
-
- if (buf->commit[subbuf_idx] == full) {
- subbuf = buf->start + subbuf_idx * buf->chan->subbuf_size;
- buf->chan->cb->deliver(buf, subbuf_idx, subbuf);
- }
-}
-
-/**
- * do_switch - change subbuf pointer and do related bookkeeping
- */
-static inline void do_switch(struct rchan_buf *buf, unsigned new, unsigned old)
-{
- unsigned start = 0;
- void *old_data = buf->start + old * buf->chan->subbuf_size;
-
- buf->data = get_next_subbuf(buf);
- buf->padding[new] = 0;
- start = buf->chan->cb->subbuf_start(buf, buf->data, old, old_data);
- buf->offset = buf->commit[new] = start;
-}
-
-/**
- * relay_switch_subbuf - switch to a new sub-buffer
- * @buf: channel buffer
- * @length: size of current event
- *
- * Returns either the length passed in or 0 if full.
-
- * Performs sub-buffer-switch tasks such as invoking callbacks,
- * updating padding counts, waking up readers, etc.
- */
-unsigned relay_switch_subbuf(struct rchan_buf *buf, unsigned length)
-{
- int new, old, produced = atomic_read(&buf->subbufs_produced);
- unsigned padding;
-
- if (unlikely(length > buf->chan->subbuf_size))
- goto toobig;
-
- if (unlikely(atomic_read(&buf->unfull))) {
- atomic_set(&buf->unfull, 0);
- new = produced % buf->chan->n_subbufs;
- old = (produced - 1) % buf->chan->n_subbufs;
- do_switch(buf, new, old);
- return 0;
- }
-
- if (unlikely(relay_buf_full(buf)))
- return 0;
-
- old = produced % buf->chan->n_subbufs;
- padding = buf->chan->subbuf_size - buf->offset;
- buf->padding[old] = padding;
- deliver_check(buf, old);
- buf->offset = buf->chan->subbuf_size;
- atomic_inc(&buf->subbufs_produced);
-
- if (waitqueue_active(&buf->read_wait)) {
- PREPARE_WORK(&buf->wake_readers, wakeup_readers, buf);
- schedule_delayed_work(&buf->wake_readers, 1);
- }
-
- if (unlikely(relay_buf_full(buf))) {
- void *old_data = buf->start + old * buf->chan->subbuf_size;
- buf->chan->cb->buf_full(buf, old, old_data);
- return 0;
- }
-
- new = (produced + 1) % buf->chan->n_subbufs;
- do_switch(buf, new, old);
-
- if (unlikely(length + buf->offset > buf->chan->subbuf_size))
- goto toobig;
-
- return length;
-
- toobig:
- printk(KERN_WARNING "relayfs: event too large (%u)\n", length);
- WARN_ON(1);
- return 0;
-}
-
-/**
- * relay_commit - add count bytes to a sub-buffer's commit count
- * @buf: channel buffer
- * @reserved: reserved address associated with commit
- * @count: number of bytes committed
- *
- * Invokes deliver() callback if sub-buffer is completely written.
- */
-void relay_commit(struct rchan_buf *buf,
- void *reserved,
- unsigned count)
-{
- unsigned offset, subbuf_idx;
-
- offset = reserved - buf->start;
- subbuf_idx = offset / buf->chan->subbuf_size;
- buf->commit[subbuf_idx] += count;
- deliver_check(buf, subbuf_idx);
-}
-
-/**
- * relay_subbufs_consumed - update the buffer's sub-buffers-consumed count
- * @chan: the channel
- * @cpu: the cpu associated with the channel buffer to update
- * @subbufs_consumed: number of sub-buffers to add to current buf's count
- *
- * Adds to the channel buffer's consumed sub-buffer count.
- * subbufs_consumed should be the number of sub-buffers newly consumed,
- * not the total consumed.
- *
- * NOTE: kernel clients don't need to call this function if the channel
- * mode is 'overwrite'.
- */
-void relay_subbufs_consumed(struct rchan *chan, int cpu, int subbufs_consumed)
-{
- int produced, consumed;
- struct rchan_buf *buf;
-
- if (!chan)
- return;
-
- if (cpu >= NR_CPUS || !chan->buf[cpu])
- return;
-
- buf = chan->buf[cpu];
- if (relay_buf_full(buf))
- atomic_set(&buf->unfull, 1);
-
- atomic_add(subbufs_consumed, &buf->subbufs_consumed);
- produced = atomic_read(&buf->subbufs_produced);
- consumed = atomic_read(&buf->subbufs_consumed);
- if (consumed > produced)
- atomic_set(&buf->subbufs_consumed, produced);
-}
-
-/**
- * relay_destroy_channel - free the channel struct
- *
- * Should only be called from kref_put().
- */
-void relay_destroy_channel(struct kref *kref)
-{
- struct rchan *chan = container_of(kref, struct rchan, kref);
- kfree(chan);
-}
-
-/**
- * relay_close - close the channel
- * @chan: the channel
- *
- * Closes all channel buffers and frees the channel.
- */
-void relay_close(struct rchan *chan)
-{
- int i;
-
- if (!chan)
- return;
-
- for (i = 0; i < NR_CPUS; i++) {
- if (!chan->buf[i])
- continue;
- relay_close_buf(chan->buf[i]);
- }
-
- kref_put(&chan->kref, relay_destroy_channel);
-}
-
-/**
- * relay_flush - close the channel
- * @chan: the channel
- *
- * Flushes all channel buffers i.e. forces buffer switch.
- */
-void relay_flush(struct rchan *chan)
-{
- int i;
-
- if (!chan)
- return;
-
- for (i = 0; i < NR_CPUS; i++) {
- if (!chan->buf[i])
- continue;
- relay_switch_subbuf(chan->buf[i], 0);
- }
-}
-
-EXPORT_SYMBOL_GPL(relay_open);
-EXPORT_SYMBOL_GPL(relay_close);
-EXPORT_SYMBOL_GPL(relay_flush);
-EXPORT_SYMBOL_GPL(relay_reset);
-EXPORT_SYMBOL_GPL(relay_subbufs_consumed);
-EXPORT_SYMBOL_GPL(relay_commit);
-EXPORT_SYMBOL_GPL(relay_switch_subbuf);
+++ /dev/null
-#ifndef _RELAY_H
-#define _RELAY_H
-
-struct dentry *relayfs_create_file(const char *name,
- struct dentry *parent,
- int mode,
- struct rchan *chan);
-extern int relayfs_remove(struct dentry *dentry);
-extern int relay_buf_empty(struct rchan_buf *buf);
-extern void relay_destroy_channel(struct kref *kref);
-
-#endif /* _RELAY_H */
+++ /dev/null
-
-relayfs - a high-speed data relay filesystem
-============================================
-
-relayfs is a filesystem designed to provide an efficient mechanism for
-tools and facilities to relay large and potentially sustained streams
-of data from kernel space to user space.
-
-The main abstraction of relayfs is the 'channel'. A channel consists
-of a set of per-cpu kernel buffers each represented by a file in the
-relayfs filesystem. Kernel clients write into a channel using
-efficient write functions which automatically log to the current cpu's
-channel buffer. User space applications mmap() the per-cpu files and
-retrieve the data as it becomes available.
-
-The format of the data logged into the channel buffers is completely
-up to the relayfs client; relayfs does however provide hooks which
-allow clients to impose some stucture on the buffer data. Nor does
-relayfs implement any form of data filtering - this also is left to
-the client. The purpose is to keep relayfs as simple as possible.
-
-This document provides an overview of the relayfs API. The details of
-the function parameters are documented along with the functions in the
-filesystem code - please see that for details.
-
-
-The relayfs user space API
-==========================
-
-relayfs implements basic file operations for user space access to
-relayfs channel buffer data. Here are the file operations that are
-available and some comments regarding their behavior:
-
-open() enables user to open an _existing_ buffer.
-
-mmap() results in channel buffer being mapped into the caller's
- memory space.
-
-poll() POLLIN/POLLRDNORM/POLLERR supported. User applications are
- notified when sub-buffer boundaries are crossed.
-
-close() decrements the channel buffer's refcount. When the refcount
- reaches 0 i.e. when no process or kernel client has the buffer
- open, the channel buffer is freed.
-
-
-In order for a user application to make use of relayfs files, the
-relayfs filesystem must be mounted. For example,
-
- mount -t relayfs relayfs /mnt/relay
-
-NOTE: relayfs doesn't need to be mounted for kernel clients to create
- or use channels - it only needs to be mounted when user space
- applications need access to the buffer data.
-
-
-The relayfs kernel API
-======================
-
-Here's a summary of the API relayfs provides to in-kernel clients:
-
-
- channel management functions:
-
- relay_open(base_filename, parent, subbuf_size, n_subbufs,
- overwrite, callbacks)
- relay_close(chan)
- relay_flush(chan)
- relay_reset(chan)
- relayfs_create_dir(name, parent)
- relayfs_remove_dir(dentry)
- relay_commit(buf, reserved, count)
- relay_subbufs_consumed(chan, cpu, subbufs_consumed)
-
- write functions:
-
- relay_write(chan, data, length)
- __relay_write(chan, data, length)
- relay_reserve(chan, length)
-
- callbacks:
-
- subbuf_start(buf, subbuf, prev_subbuf_idx, prev_subbuf)
- deliver(buf, subbuf_idx, subbuf)
- buf_mapped(buf, filp)
- buf_unmapped(buf, filp)
- buf_full(buf, subbuf_idx)
-
-
-A relayfs channel is made of up one or more per-cpu channel buffers,
-each implemented as a circular buffer subdivided into one or more
-sub-buffers.
-
-relay_open() is used to create a channel, along with its per-cpu
-channel buffers. Each channel buffer will have an associated file
-created for it in the relayfs filesystem, which can be opened and
-mmapped from user space if desired. The files are named
-basename0...basenameN-1 where N is the number of online cpus, and by
-default will be created in the root of the filesystem. If you want a
-directory structure to contain your relayfs files, you can create it
-with relayfs_create_dir() and pass the parent directory to
-relay_open(). Clients are responsible for cleaning up any directory
-structure they create when the channel is closed - use
-relayfs_remove_dir() for that.
-
-The total size of each per-cpu buffer is calculated by multiplying the
-number of sub-buffers by the sub-buffer size passed into relay_open().
-The idea behind sub-buffers is that they're basically an extension of
-double-buffering to N buffers, and they also allow applications to
-easily implement random-access-on-buffer-boundary schemes, which can
-be important for some high-volume applications. The number and size
-of sub-buffers is completely dependent on the application and even for
-the same application, different conditions will warrant different
-values for these parameters at different times. Typically, the right
-values to use are best decided after some experimentation; in general,
-though, it's safe to assume that having only 1 sub-buffer is a bad
-idea - you're guaranteed to either overwrite data or lose events
-depending on the channel mode being used.
-
-relayfs channels can be opened in either of two modes - 'overwrite' or
-'no-overwrite'. In overwrite mode, writes continuously cycle around
-the buffer and will never fail, but will unconditionally overwrite old
-data regardless of whether it's actually been consumed. In
-no-overwrite mode, writes will fail i.e. data will be lost, if the
-number of unconsumed sub-buffers equals the total number of
-sub-buffers in the channel. In this mode, the client is reponsible
-for notifying relayfs when sub-buffers have been consumed via
-relay_subbufs_consumed(). A full buffer will become 'unfull' and
-logging will continue once the client calls relay_subbufs_consumed()
-again. When a buffer becomes full, the buf_full() callback is invoked
-to notify the client. In both modes, the subbuf_start() callback will
-notify the client whenever a sub-buffer boundary is crossed. This can
-be used to write header information into the new sub-buffer or fill in
-header information reserved in the previous sub-buffer. One piece of
-information that's useful to save in a reserved header slot is the
-number of bytes of 'padding' for a sub-buffer, which is the amount of
-unused space at the end of a sub-buffer. The padding count for each
-sub-buffer is contained in an array in the rchan_buf struct passed
-into the subbuf_start() callback: rchan_buf->padding[prev_subbuf_idx]
-can be used to to get the padding for the just-finished sub-buffer.
-subbuf_start() is also called for the first sub-buffer in each channel
-buffer when the channel is created. The mode is specified to
-relay_open() using the overwrite parameter.
-
-kernel clients write data into the current cpu's channel buffer using
-relay_write() or __relay_write(). relay_write() is the main logging
-function - it uses local_irqsave() to protect the buffer and should be
-used if you might be logging from interrupt context. If you know
-you'll never be logging from interrupt context, you can use
-__relay_write(), which only disables preemption. These functions
-don't return a value, so you can't determine whether or not they
-failed - the assumption is that you wouldn't want to check a return
-value in the fast logging path anyway, and that they'll always succeed
-unless the buffer is full and in no-overwrite mode, in which case
-you'll be notified via the buf_full() callback.
-
-relay_reserve() is used to reserve a slot in a channel buffer which
-can be written to later. This would typically be used in applications
-that need to write directly into a channel buffer without having to
-stage data in a temporary buffer beforehand. Because the actual write
-may not happen immediately after the slot is reserved, applications
-using relay_reserve() can call relay_commit() to notify relayfs when
-the slot has actually been written. When all the reserved slots have
-been committed, the deliver() callback is invoked to notify the client
-that a guaranteed full sub-buffer has been produced. Because the
-write is under control of the client and is separated from the
-reserve, relay_reserve() doesn't protect the buffer at all - it's up
-to the client to provide the appropriate synchronization when using
-relay_reserve().
-
-The client calls relay_close() when it's finished using the channel.
-The channel and its associated buffers are destroyed when there are no
-longer any references to any of the channel buffers. relay_flush()
-forces a sub-buffer switch on all the channel buffers, and can be used
-to finalize and process the last sub-buffers before the channel is
-closed.
-
-Some applications may want to keep a channel around and re-use it
-rather than open and close a new channel for each use. relay_reset()
-can be used for this purpose - it resets a channel to its initial
-state without reallocating channel buffer memory or destroying
-existing mappings. It should however only be called when it's safe to
-do so i.e. when the channel isn't currently being written to.
-
-Finally, there are a couple of utility callbacks that can be used for
-different purposes. buf_mapped() is called whenever a channel buffer
-is mmapped from user space and buf_unmapped() is called when it's
-unmapped. The client can use this notification to trigger actions
-within the kernel application, such as enabling/disabling logging to
-the channel.
-
-
-Resources
-=========
-
-For news, example code, mailing list, etc. see the relayfs homepage:
-
- http://relayfs.sourceforge.net
-
-
-Credits
-=======
-
-The ideas and specs for relayfs came about as a result of discussions
-on tracing involving the following:
-
-Michel Dagenais <michel.dagenais@polymtl.ca>
-Richard Moore <richardj_moore@uk.ibm.com>
-Bob Wisniewski <bob@watson.ibm.com>
-Karim Yaghmour <karim@opersys.com>
-Tom Zanussi <zanussi@us.ibm.com>
-
-Also thanks to Hubertus Franke for a lot of useful suggestions and bug
-reports.
+++ /dev/null
-2007-03-12 Frank Ch. Eigler <fche@elastic.org>
-
- * librelay.c (init_stp): Use /proc/MODULE rather than
- /proc/systemtap/MODULE.
-
-2006-12-11 Martin Hunt <hunt@redhat.com>
-
- * symbols.c (get_sections): Set buffer sizes to large enough
- sizes to hold all possible values, but also include checks in case
- we are wrong.
-
-2006-11-15 Martin Hunt <hunt@redhat.com>
-
- * symbols.c (do_kernel_symbols): Add sizeof(long) to sym_base
- to preserve 64-bit alignment.
-
-2006-11-09 Martin Hunt <hunt@redhat.com>
-
- * librelay.c: Change all references to transport messages
- to use the new names with "_stp" prefix.
- (stp_main_loop): For STP_SYMBOLS, check pointer size and
- endianess to confirm staprun is compatible with the kernel.
-
- * librelay.h: Move a bunch of common includes here.
- * stpd.c: Cleanup includes.
- * symbols.c: Ditto.
-
-2006-11-02 Martin Hunt <hunt@redhat.com>
-
- * symbols.c: New file. Sends symbol and module information to
- the systemtap module.
-
- * librelay.c (stp_main_loop): Add STP_MODULE and STP_SYMBOLS
- message handling.
-
- * librelay.h: Add some new function prototypes.
-
- * Makefile (CFLAGS): Set to be the same as for building modules.
- Added symbols.c to sources.
-
-2006-10-10 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (merge_output): Add check for min when writing
- output, otherwise last write happens twice.
-
-2006-09-26 David Smith <dsmith@redhat.com>
-
- * Makefile: Changed 'stpd' references to 'staprun'.
- * librelay.c: Ditto.
- * stpd.c: Ditto.
-
-2006-09-25 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (kill_percpu_threads): Remove printf.
- (wait_for_percpu_threads): New.
- (process_subbufs): Remove processing, processing_mutex, exit
- thread if exiting flag set.
- (read_last_buffers): Removed.
- (cleanup_and_exit): Remove call to read_last_buffers, wait for
- threads to read flushed buffers instead.
- (stp_main_loop): Remove mutex init.
-
-2006-09-22 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (init_relayfs): Cleanup if stp_check fails.
-
-2006-09-19 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (init_relayfs): Add debugfs path to relay files and
- add new systemtap directory to path.
- (init_stp): rmmod module on failure.
- (merge_output): Remove debugging printfs left in code.
- (close_relay_files): Clear relay_file descriptor after close.
- (cleanup_and_exit): Allow cleanup and exit even if there was an
- error opening relay files.
- (stp_main_loop): Call cleanup_and_exit() if init_relayfs() fails.
-
-2006-09-18 Martin Hunt <hunt@redhat.com>
-
- * stpd.c (usage): Remove "-m" option.
- (main): Print warning if "-m" is used.
- * librelay.c (merge_output): Rewrite to handle
- new format that support binary.
- (stp_main_loop): Read merge option from the
- transport info message.
-
-2006-09-13 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (init_relayfs): Exec stp_check and find
- relay_filebase.
-
- * librelay.h (stp_main_loop): Fix declaration of init_stp().
-
- * stpd.c (usage): Remove "-r" option.
- (main): Don't find stpd_filebase and don't send it to init_stp().
-
-
-2006-08-02 Tom Zanussi <zanussi@us.ibm.com>
-
- * stpd.c (main): Use modname rather than driver_pid in
- stpd_filebase.
-
-2006-07-20 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (stp_main_loop): If module doesn't start, kill any
- target command.
-
-2006-06-23 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (cleanup_and_exit): Close relay files even if
- not merging.
-
-2006-06-13 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (start_cmd): Rewrite using sigwait() to eliminate
- a race.
-
-2006-05-18 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (stp_main_loop): Set output to always be line
- buffered.
-
-2006-04-08 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (stp_main_loop): Write with fwrite() instead
- of fputs() so we can write binary data.
-
-2006-04-05 Martin Hunt <hunt@redhat.com>
- * librelay.c (merge_output): Remove ANSI codes and write
- warning to stderr.
-
-2006-04-05 Martin Hunt <hunt@redhat.com>
- * librelay.c (merge_output): Set the output filename if necessary.
- (merge_output):
-
- * stpd.c (main): Don't reset output_filename just because
- relayfs is possible. Move that code to librelay.c.
-
-2006-04-04 Roland McGrath <roland@redhat.com>
-
- * stpd.c (main): Cast f_type when comparing; type differs by machine.
-
-2006-04-04 Tom Zanussi <zanussi@us.ibm.com>
-
- * stpd.c (main): Check that /mnt/relay is actually relayfs.
-
-2006-03-15 Tom Zanussi <zanussi@us.ibm.com>
-
- * stpd.c (main): Add runtime check for relayfs vs relay-on-proc.
-
-2006-03-06 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (start_cmd): Set proper uid/gid before execing
- command.
- (system_cmd): New function.
- (cleanup_and_exit): Wait for any child processes to complete.
- (stp_main_loop): Recognize STP_SYSTEM message.
-
- * stpd.c (main): Add support for "-u username".
-
-2006-02-25 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (init_stp): Better error handling and cleanup.
-
-2006-02-23 Frank Ch. Eigler <fche@elastic.org>
-
- PR 1304
- * stpd.c (mdooptions): New array.
- (main): Populate it with leftover arguments.
- * librelay.c (init_stp): Pass it to execve().
-
-2005-12-08 Frank Ch. Eigler <fche@elastic.org>
-
- PR 1937
- * stpd.c (main): Support new "-d" option.
- (usage): Document it.
- * librelay.c (driver_poll): New function to react to death of
- driver process.
- (stp_main_loop): Call it if "-d PID" given. Treat SIGHUP like others.
-
-2005-10-19 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c: Move output_file var to stpd.c.
- (stp_main_loop): If the output_file option was specified,
- and streaming mode is being used, send output to the file
- instead of stdout. If !streaming, send output to the file
- instead of probe.out.
- * stpd.c (usage): Add comment for -o option.
- (main): Add -o option.
-
-2005-10-19 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (merge_output): Switch to binary TIMESTAMP.
- * stp_dump.c (main): Switch to binary TIMESTAMP.
- * stp_merge.c (main): Switch to binary TIMESTAMP.
-
-2005-10-14 Tom Zanussi <zanussi@us.ibm.com>
-
- PR 1476
- * librelay.c: Add flag for buffer processing.
- (reader_thread): Disable/enable cancel state around buffer
- processing, and update flag to show we're busy processing.
- (cleanup_and_exit): Wait for any threads busy processing.
- (stp_main_loop): Initialize processing mutex.
-
-2005-09-06 Martin Hunt <hunt@redhat.com>
-
- * librelay.c: Remove all USE_PROCFS ifdefs.
- (sig_usr): Signal handler for SIGUSR1.
- (start_cmd): New function to handle "-c" option, forks()
- off a new process then waits for SIGUSR1 to exec it.
- (init_stp): Call start_cmd().
- (stp_main_loop): Set a signal handler for SIGCHLD.
-
- * stpd.c (main): Add "-t" and "-c" options.
- (usage): Update with new options.
-
-2005-08-29 Martin Hunt <hunt@redhat.com>
-
- * stpd.c main): Add enable_relayfs flag.
- Turn it off with "-r".
-
-2005-08-24 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (sigproc): Removed the "Exiting..."
- message for now.
-
-2005-08-24 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (sigproc): Reestablish signal handler so
- impatient people don't hit ^C twice and terminate the
- program before it saves the data and removes the module.
- Also print a message to stderr that it is exiting.
- (stp_main_loop): Write OOB data (warnings, errors, etc)
- to stderr instead of stdout.
- * librelay.h: Write debug info to stderr.
- * Makefile: add librelay.h to dependencies.
-
-2005-08-23 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (merge_output): Don't add an extra \n.
-
-2005-08-23 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (read_last_buffers): New function. Directly grab the
- last buffers.
- (info_pending): Deleted.
- (request_last_buffers): Deleted.
-
-2005-08-22 Martin Hunt <hunt@redhat.com>
-
- * Makefile (debug): Add debug target.
- * librelay.h (dbug): Define.
- * librelay.c: Enable some dbug lines.
-
-2005-08-19 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (reader_thread): Check the return value for write().
-
-2005-08-19 Frank Ch. Eigler <fche@elastic.org>
-
- * librelay.c (modpath): New global. Use it for insmod only.
- * stpd.c (main): Set both modpath and modname, to support
- modules specified by full path name.
-
-2005-08-19 Martin Hunt <hunt@redhat.com>
-
- * stpd.c (main): Simplify buffer size code.
- * librelay.c: Major changes to support procfs instead of netlink.
-
-2005-08-03 Tom Zanussi <trz@us.ibm.com>
-
- * librelay.c: Track subbuf info requests/replies
- so we know unequivocally when it's ok to do final
- processing.
- (reader_thread): Remove buffer-full warning.
-
-2005-08-03 Martin Hunt <hunt@redhat.com>
- * librelay.c (init_stp): Change variable name to eliminate shadow warning.
-
-2005-08-03 Martin Hunt <hunt@redhat.com>
- * librelay.c (open_control_channel): Set the receive buffer
- to 512K, or the max allowed.
-
- * stpd.c: Remove "-n" subbug option and change "-b" option
- so you can specify buffering in different ways. Add a verbose option.
- Exec the "stp_check" script.
-
-2005-08-01 Frank Ch. Eigler <fche@redhat.com>
-
- * librelay.c: Correct fwrite api usage.
- * all: Correct copyright holder name.
-
-2005-08-01 Martin Hunt <hunt@redhat.com>
-
- * librelay.h: Get structs and enums from
- ../transport/transport_msgs.h to eliminate duplication.
-
- * librelay.c (send_request): Retry if send fails.
- (open_relayfs_files): Use fopen() instead of open() for the
- percpu tmpfiles.
- (request_last_buffers): Just send cpu number for STP_BUF_INFO request.
- (reader_thread): Ditto.
- (process_subbufs): Use fwrite_unlocked() instead of write().
- (sigchld): Removed.
- (init_stp): Go back to using system() instead of fork and exec
- to load module. When done, send a TRANSPORT_INFO request.
- (cleanup_and_exit): Change parameter to simple flag to
- indicate if the module needs removing.
- (sigproc): Remove complicated logic and just send STP_EXIT.
- (stp_main_loop): When receiving STP_TRANSPORT_INFO, set
- the local params and reply with a STP_START. When
- receiving STP_START, there was an error, so cleanup and exit.
-
- * stpd.c (main): Added new options to set number of
- buffers and their size.
-
-2005-07-29 Roland McGrath <roland@redhat.com>
-
- * librelay.c (process_subbufs): Use unsigned for I.
- (sigproc): Add __attribute__((unused)) on parameter.
- (sigchld): Likewise. Avoid shadowing global variable name.
- (stp_main_loop): Add a cast.
-
-2005-07-18 Martin Hunt <hunt@redhat.com>
-
- * stp_merge.c (main): Fix dropped count calculation.
-
-2005-07-14 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c (reader_thread): Add missing pthread_mutex_lock
-
-2005-07-14 Frank Ch. Eigler <fche@redhat.com>
-
- * stpd.c (main): Pass !quiet mode to init_stp().
- * librelay.c (init_relayfs): Be quiet if !print_totals.
-
-2005-07-13 Martin Hunt <hunt@redhat.com>
-
- * stpd.c (usage): Fix usage string.
-
- * librelay.c (init_stp): Change last arg to NULL, not 0.
-
-2005-07-08 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (sigchld): Signal handler to detect
- completion of module loading.
- (init_stp): Use fork/exec instead of system() so
- we can get async signal of module load success/failure.
- (cleanup_and_exit): New function.
- (sigproc): If module is not loaded, don't send message to it.
- (stp_main_loop): Call cleanup_and_exit() when STP_EXIT
- is received. Don't send a request for the transport
- mode. The module will send notification to the daemon
- when it is ready.
-
- * stpd.c (main): Don't print message until module
- is loaded.
-
-2005-07-01 Martin Hunt <hunt@redhat.com>
-
- * librelay.c: Removed the color coding of cpu output.
-
-2005-06-28 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (merge_output): Use unlocked stdio
- to improve speed.
-
- * stp_merge.c: New file.
-
- * Makefile: Add stp_merge.
-
-2005-06-27 Martin Hunt <hunt@redhat.com>
-
- * stpd.c (main): Add new command line arg, "-m"
- to disable the per-cpu merging.
-
- * librelay.c (merge_output): Replacement for sort_output().
- Efficiently merges per-cpu streams.
-
-
-2005-06-20 Tom Zanussi <zanussi@us.ibm.com>
-
- * librelay.c: Large refactoring, important changes are
- added transport_mode command, for relayfs transport
- display results only when probe completes and/or write
- output file, merge, sort and delete the per-cpu files
- in postprocessing, refactor so that relayfs files aren't
- created until transport command received, removed sigalrm,
- read the final subbuffers on exit
-
- * stpd.c: Remove all command-line args except for -p
- and -q as well as all code related to buffer sizes.
-
- * librelay.h: Add transport mode command and struct.
-
-2005-05-16 Martin Hunt <hunt@redhat.com>
-
- * librelay.c (sigproc): If STP_EXIT send fails, keep retrying
- every 10ms.
- (init_stp): Don't set n_subbufs and subbuf_size params.
+++ /dev/null
-CFLAGS = -Wall -std=gnu99 -D_GNU_SOURCE -fexceptions -Wall -Werror -Wshadow -Wunused
-
-all: staprun stp_merge stp_dump
-
-staprun: stpd.c librelay.c symbols.c ../transport/transport_msgs.h librelay.h
- gcc -O3 $(CFLAGS) -o staprun stpd.c librelay.c symbols.c -lpthread
-
-stp_merge: stp_merge.c
- gcc -O3 $(CFLAGS) -o stp_merge stp_merge.c
-
-stp_dump: stp_dump.c
- gcc -O3 $(CFLAGS) -o stp_dump stp_dump.c
-
-debug: stpd.c librelay.c symbols.c ../transport/transport_msgs.h librelay.h
- gcc -g -D DEBUG $(CFLAGS) -o staprun stpd.c librelay.c symbols.c -lpthread
-
-clean:
- /bin/rm -f staprun stp_merge *.o *~
+++ /dev/null
-/*
- * libstp - staprun 'library'
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2005
- * Copyright (C) Red Hat Inc, 2005, 2006
- *
- */
-#include "librelay.h"
-#include <signal.h>
-#include <sys/ioctl.h>
-#include <errno.h>
-#include <linux/fd.h>
-#include <sys/mman.h>
-#include <sys/poll.h>
-#include <pthread.h>
-#include <sys/socket.h>
-#include <linux/types.h>
-#include <linux/limits.h>
-#include <sys/wait.h>
-#include <sys/statfs.h>
-
-
-/* stp_check script */
-#ifdef PKGLIBDIR
-char *stp_check=PKGLIBDIR "/stp_check";
-#else
-char *stp_check="stp_check";
-#endif
-
-/* maximum number of CPUs we can handle - change if more */
-#define NR_CPUS 256
-
-/* relayfs parameters */
-static struct params
-{
- unsigned subbuf_size;
- unsigned n_subbufs;
- int merge;
- char relay_filebase[256];
-} params;
-
-/* temporary per-cpu output written here for relayfs, filebase0...N */
-static char *percpu_tmpfilebase = "stpd_cpu";
-
-/* procfs files */
-static char proc_filebase[128];
-static int proc_file[NR_CPUS];
-
-/* probe output written here, if non-NULL */
-/* if no output file name is specified, use this */
-#define DEFAULT_RELAYFS_OUTFILE_NAME "probe.out"
-extern char *outfile_name;
-
-/* internal variables */
-static int transport_mode;
-static int ncpus;
-static int print_totals;
-static int exiting;
-
-/* per-cpu data */
-static int relay_file[NR_CPUS];
-static FILE *percpu_tmpfile[NR_CPUS];
-static char *relay_buffer[NR_CPUS];
-static pthread_t reader[NR_CPUS];
-
-/* control channel */
-int control_channel;
-
-/* flags */
-extern int print_only, quiet, verbose;
-extern unsigned int buffer_size;
-extern char *modname;
-extern char *modpath;
-extern char *modoptions[];
-extern int target_pid;
-extern int driver_pid;
-extern char *target_cmd;
-
-/* uid/gid to use when execing external programs */
-extern uid_t cmd_uid;
-extern gid_t cmd_gid;
-
-/* per-cpu buffer info */
-static struct buf_status
-{
- struct _stp_buf_info info;
- unsigned max_backlog; /* max # sub-buffers ready at one time */
-} status[NR_CPUS];
-
-
-
-/**
- * streaming - is the current transport mode streaming or not?
- *
- * Returns 1 if in streaming mode, 0 otherwise.
- */
-static int streaming(void)
-{
- if (transport_mode == STP_TRANSPORT_PROC)
- return 1;
-
- return 0;
-}
-
-/**
- * send_request - send request to kernel over control channel
- * @type: the relay-app command id
- * @data: pointer to the data to be sent
- * @len: length of the data to be sent
- *
- * Returns 0 on success, negative otherwise.
- */
-int send_request(int type, void *data, int len)
-{
- char buf[1024];
- memcpy(buf, &type, 4);
- memcpy(&buf[4],data,len);
- return write(control_channel, buf, len+4);
-}
-
-
-/**
- * summarize - print a summary if applicable
- */
-static void summarize(void)
-{
- int i;
-
- if (transport_mode != STP_TRANSPORT_RELAYFS)
- return;
-
- printf("summary:\n");
- for (i = 0; i < ncpus; i++) {
- printf("cpu %u:\n", i);
- printf(" %u sub-buffers processed\n",
- status[i].info.consumed);
- printf(" %u max backlog\n", status[i].max_backlog);
- }
-}
-
-static void close_proc_files()
-{
- int i;
- for (i = 0; i < ncpus; i++)
- close(proc_file[i]);
-}
-
-/**
- * close_relayfs_files - close and munmap buffer and open output file
- */
-static void close_relayfs_files(int cpu)
-{
- size_t total_bufsize = params.subbuf_size * params.n_subbufs;
-
- munmap(relay_buffer[cpu], total_bufsize);
- close(relay_file[cpu]);
- relay_file[cpu] = 0;
- fclose(percpu_tmpfile[cpu]);
-}
-
-/**
- * close_all_relayfs_files - close and munmap buffers and output files
- */
-static void close_all_relayfs_files(void)
-{
- int i;
-
- if (!streaming()) {
- for (i = 0; i < ncpus; i++)
- close_relayfs_files(i);
- }
-}
-
-/**
- * open_relayfs_files - open and mmap buffer and open output file
- */
-static int open_relayfs_files(int cpu, const char *relay_filebase)
-{
- size_t total_bufsize;
- char tmp[PATH_MAX];
-
- memset(&status[cpu], 0, sizeof(struct buf_status));
- status[cpu].info.cpu = cpu;
-
- sprintf(tmp, "%s%d", relay_filebase, cpu);
- relay_file[cpu] = open(tmp, O_RDONLY | O_NONBLOCK);
- if (relay_file[cpu] < 0) {
- fprintf(stderr, "ERROR: couldn't open relayfs file %s: errcode = %s\n", tmp, strerror(errno));
- return -1;
- }
-
- sprintf(tmp, "%s/%d", proc_filebase, cpu);
- dbug("Opening %s.\n", tmp);
- proc_file[cpu] = open(tmp, O_RDWR | O_NONBLOCK);
- if (proc_file[cpu] < 0) {
- fprintf(stderr, "ERROR: couldn't open proc file %s: errcode = %s\n", tmp, strerror(errno));
- return -1;
- }
-
- sprintf(tmp, "%s%d", percpu_tmpfilebase, cpu);
- if((percpu_tmpfile[cpu] = fopen(tmp, "w+")) == NULL) {
- fprintf(stderr, "ERROR: Couldn't open output file %s: errcode = %s\n", tmp, strerror(errno));
- close(relay_file[cpu]);
- return -1;
- }
-
- total_bufsize = params.subbuf_size * params.n_subbufs;
- relay_buffer[cpu] = mmap(NULL, total_bufsize, PROT_READ,
- MAP_PRIVATE | MAP_POPULATE, relay_file[cpu],
- 0);
- if(relay_buffer[cpu] == MAP_FAILED)
- {
- fprintf(stderr, "ERROR: couldn't mmap relay file, total_bufsize (%d) = subbuf_size (%d) * n_subbufs(%d), error = %s \n", (int)total_bufsize, (int)params.subbuf_size, (int)params.n_subbufs, strerror(errno));
- close(relay_file[cpu]);
- fclose(percpu_tmpfile[cpu]);
- return -1;
- }
-
- return 0;
-}
-
-/**
- * delete_percpu_files - delete temporary per-cpu output files
- *
- * Returns 0 if successful, -1 otherwise.
- */
-static int delete_percpu_files(void)
-{
- int i;
- char tmp[PATH_MAX];
-
- for (i = 0; i < ncpus; i++) {
- sprintf(tmp, "%s%d", percpu_tmpfilebase, i);
- if (unlink(tmp) < 0) {
- fprintf(stderr, "ERROR: couldn't unlink percpu file %s: errcode = %s\n", tmp, strerror(errno));
- return -1;
- }
- }
- return 0;
-}
-
-/**
- * kill_percpu_threads - kill per-cpu threads 0->n-1
- * @n: number of threads to kill
- *
- * Returns number of threads killed.
- */
-static int kill_percpu_threads(int n)
-{
- int i, killed = 0;
-
- for (i = 0; i < n; i++) {
- if (pthread_cancel(reader[i]) == 0)
- killed++;
- }
-
- return killed;
-}
-
-/**
- * wait_for_percpu_threads - wait for all threads to exit
- * @n: number of threads to wait for
- */
-static void wait_for_percpu_threads(int n)
-{
- int i;
-
- for (i = 0; i < n; i++)
- pthread_join(reader[i], NULL);
-}
-
-/**
- * process_subbufs - write ready subbufs to disk
- */
-static int process_subbufs(struct _stp_buf_info *info)
-{
- unsigned subbufs_ready, start_subbuf, end_subbuf, subbuf_idx, i;
- int len, cpu = info->cpu;
- char *subbuf_ptr;
- int subbufs_consumed = 0;
- unsigned padding;
-
- subbufs_ready = info->produced - info->consumed;
- start_subbuf = info->consumed % params.n_subbufs;
- end_subbuf = start_subbuf + subbufs_ready;
-
- for (i = start_subbuf; i < end_subbuf; i++) {
- subbuf_idx = i % params.n_subbufs;
- subbuf_ptr = relay_buffer[cpu] + subbuf_idx * params.subbuf_size;
- padding = *((unsigned *)subbuf_ptr);
- subbuf_ptr += sizeof(padding);
- len = (params.subbuf_size - sizeof(padding)) - padding;
- if (len) {
- if (fwrite_unlocked (subbuf_ptr, len, 1, percpu_tmpfile[cpu]) != 1) {
- fprintf(stderr, "ERROR: couldn't write to output file for cpu %d, exiting: errcode = %d: %s\n", cpu, errno, strerror(errno));
- exit(1);
- }
- }
- subbufs_consumed++;
- }
-
- return subbufs_consumed;
-}
-
-/**
- * reader_thread - per-cpu channel buffer reader
- */
-static void *reader_thread(void *data)
-{
- int rc;
- int cpu = (long)data;
- struct pollfd pollfd;
- struct _stp_consumed_info consumed_info;
- unsigned subbufs_consumed;
-
- pollfd.fd = relay_file[cpu];
- pollfd.events = POLLIN;
-
- do {
- rc = poll(&pollfd, 1, -1);
- if (rc < 0) {
- if (errno != EINTR) {
- fprintf(stderr, "ERROR: poll error: %s\n",
- strerror(errno));
- exit(1);
- }
- fprintf(stderr, "WARNING: poll warning: %s\n",
- strerror(errno));
- rc = 0;
- }
-
- rc = read(proc_file[cpu], &status[cpu].info,
- sizeof(struct _stp_buf_info));
- subbufs_consumed = process_subbufs(&status[cpu].info);
- if (subbufs_consumed) {
- if (subbufs_consumed > status[cpu].max_backlog)
- status[cpu].max_backlog = subbufs_consumed;
- status[cpu].info.consumed += subbufs_consumed;
- consumed_info.cpu = cpu;
- consumed_info.consumed = subbufs_consumed;
- if (write (proc_file[cpu], &consumed_info, sizeof(struct _stp_consumed_info)) < 0)
- fprintf(stderr,"WARNING: writing consumed info failed.\n");
- }
- if (status[cpu].info.flushing)
- pthread_exit(NULL);
- } while (1);
-}
-
-#define RELAYFS_MAGIC 0xF0B4A981
-#define DEBUGFS_MAGIC 0x64626720
-/**
- * init_relayfs - create files and threads for relayfs processing
- *
- * Returns 0 if successful, negative otherwise
- */
-int init_relayfs(void)
-{
- int i, j, wstat;
- pid_t pid;
- struct statfs st;
-
- dbug("initializing relayfs\n");
-
- /* first run the _stp_check script */
- if ((pid = fork()) < 0) {
- perror ("fork of stp_check failed.");
- exit(-1);
- } else if (pid == 0) {
- if (execlp(stp_check, stp_check, NULL) < 0)
- _exit (-1);
- }
- if (waitpid(pid, &wstat, 0) < 0) {
- perror("waitpid");
- exit(-1);
- }
- if (WIFEXITED(wstat) && WEXITSTATUS(wstat)) {
- perror (stp_check);
- fprintf(stderr, "Could not execute %s\n", stp_check);
- return -1;
- }
-
- if (statfs("/mnt/relay", &st) == 0 && (int) st.f_type == (int) RELAYFS_MAGIC)
- sprintf(params.relay_filebase, "/mnt/relay/systemtap/%d/cpu", getpid());
- else if (statfs("/sys/kernel/debug", &st) == 0 && (int) st.f_type == (int) DEBUGFS_MAGIC)
- sprintf(params.relay_filebase, "/sys/kernel/debug/systemtap/%d/cpu", getpid());
- else
- sprintf(params.relay_filebase, "/debug/systemtap/%d/cpu", getpid());
-
- for (i = 0; i < ncpus; i++) {
- if (open_relayfs_files(i, params.relay_filebase) < 0) {
- fprintf(stderr, "ERROR: couldn't open relayfs files, cpu = %d\n", i);
- goto err;
- }
- /* create a thread for each per-cpu buffer */
- if (pthread_create(&reader[i], NULL, reader_thread, (void *)(long)i) < 0) {
- close_relayfs_files(i);
- fprintf(stderr, "ERROR: Couldn't create reader thread, cpu = %d\n", i);
- goto err;
- }
- }
-
- if (print_totals && verbose)
- printf("Using channel with %u sub-buffers of size %u.\n",
- params.n_subbufs, params.subbuf_size);
-
- return 0;
-err:
- for (j = 0; j < i; j++)
- close_relayfs_files(j);
- kill_percpu_threads(i);
-
- return -1;
-}
-
-void start_cmd(void)
-{
- pid_t pid;
- sigset_t usrset;
-
- sigemptyset(&usrset);
- sigaddset(&usrset, SIGUSR1);
- sigprocmask(SIG_BLOCK, &usrset, NULL);
-
- dbug ("execing target_cmd %s\n", target_cmd);
- if ((pid = fork()) < 0) {
- perror ("fork");
- exit(-1);
- } else if (pid == 0) {
- int signum;
-
- if (setregid(cmd_gid, cmd_gid) < 0) {
- perror("setregid");
- }
- if (setreuid(cmd_uid, cmd_uid) < 0) {
- perror("setreuid");
- }
- /* wait here until signaled */
- sigwait(&usrset, &signum);
-
- if (execl("/bin/sh", "sh", "-c", target_cmd, NULL) < 0)
- perror(target_cmd);
- _exit(-1);
- }
- target_pid = pid;
-}
-
-void system_cmd(char *cmd)
-{
- pid_t pid;
-
- dbug ("system %s\n", cmd);
- if ((pid = fork()) < 0) {
- perror ("fork");
- } else if (pid == 0) {
- if (setregid(cmd_gid, cmd_gid) < 0) {
- perror("setregid");
- }
- if (setreuid(cmd_uid, cmd_uid) < 0) {
- perror("setreuid");
- }
- if (execl("/bin/sh", "sh", "-c", cmd, NULL) < 0)
- perror(cmd);
- _exit(-1);
- }
-}
-
-/**
- * init_stp - initialize the app
- * @print_summary: boolean, print summary or not at end of run
- *
- * Returns 0 on success, negative otherwise.
- */
-int init_stp(int print_summary)
-{
- char buf[1024];
- struct _stp_transport_info ti;
- pid_t pid;
- int rstatus;
-
- ncpus = sysconf(_SC_NPROCESSORS_ONLN);
- print_totals = print_summary;
-
- /* insert module */
- sprintf(buf, "_stp_pid=%d", (int)getpid());
- modoptions[0] = "insmod";
- modoptions[1] = modpath;
- modoptions[2] = buf;
- /* modoptions[3...N] set by command line parser. */
-
- if ((pid = fork()) < 0) {
- perror ("fork");
- exit(-1);
- } else if (pid == 0) {
- if (execvp("/sbin/insmod", modoptions) < 0)
- _exit(-1);
- }
- if (waitpid(pid, &rstatus, 0) < 0) {
- perror("waitpid");
- exit(-1);
- }
- if (WIFEXITED(rstatus) && WEXITSTATUS(rstatus)) {
- fprintf(stderr, "ERROR, couldn't insmod probe module %s\n", modpath);
- return -1;
- }
-
- /* We no longer use /proc/systemtap/, just /proc. */
- sprintf (proc_filebase, "/proc/%s", modname);
- char *ptr = index(proc_filebase,'.');
- if (ptr)
- *ptr = 0;
-
- sprintf(buf, "%s/cmd", proc_filebase);
- dbug("Opening %s\n", buf);
- control_channel = open(buf, O_RDWR);
- if (control_channel < 0) {
- fprintf(stderr, "ERROR: couldn't open control channel %s: errcode = %s\n", buf, strerror(errno));
- goto do_rmmod;
- }
-
- /* start target_cmd if necessary */
- if (target_cmd)
- start_cmd();
-
- /* now send TRANSPORT_INFO */
- ti.buf_size = buffer_size;
- ti.subbuf_size = 0;
- ti.n_subbufs = 0;
- ti.target = target_pid;
- if (send_request(STP_TRANSPORT_INFO, &ti, sizeof(ti)) < 0) {
- fprintf(stderr, "staprun failed because TRANSPORT_INFO returned an error.\n");
- if (target_cmd)
- kill (target_pid, SIGKILL);
- close(control_channel);
- goto do_rmmod;
- }
- return 0;
-
- do_rmmod:
- snprintf(buf, sizeof(buf), "/sbin/rmmod -w %s", modname);
- if (system(buf))
- fprintf(stderr, "ERROR: couldn't rmmod probe module %s.\n", modname);
- return -1;
-}
-
-
-/* length of timestamp in output field 0 */
-#define TIMESTAMP_SIZE (sizeof(uint32_t))
-
-/**
- * merge_output - merge per-cpu output
- *
- */
-#define MERGE_BUF_SIZE 16*1024
-static int merge_output(void)
-{
- char *buf[ncpus], tmp[PATH_MAX];
- int i, j, dropped=0;
- uint32_t count=0, min, num[ncpus];
- FILE *ofp, *fp[ncpus];
- uint32_t length[ncpus];
-
- for (i = 0; i < ncpus; i++) {
- sprintf (tmp, "%s%d", percpu_tmpfilebase, i);
- fp[i] = fopen (tmp, "r");
- if (!fp[i]) {
- fprintf (stderr, "error opening file %s.\n", tmp);
- return -1;
- }
- num[i] = 0;
- buf[i] = malloc(MERGE_BUF_SIZE);
- if (!buf[i]) {
- fprintf(stderr,"Out of memory in merge_output(). Aborting merge.\n");
- printf("Out of memory in merge_output(). Aborting merge.\n");
- return -1;
- }
-
- if (fread_unlocked (&length[i], sizeof(uint32_t), 1, fp[i])) {
- if (fread_unlocked (buf[i], length[i]+TIMESTAMP_SIZE, 1, fp[i]))
- num[i] = *((uint32_t *)buf[i]);
- }
- }
-
- if (!outfile_name)
- outfile_name = DEFAULT_RELAYFS_OUTFILE_NAME;
-
- ofp = fopen (outfile_name, "w");
- if (!ofp) {
- fprintf (stderr, "ERROR: couldn't open output file %s: errcode = %s\n",
- outfile_name, strerror(errno));
- return -1;
- }
-
- do {
- min = num[0];
- j = 0;
- for (i = 1; i < ncpus; i++) {
- if (min == 0 || (num[i] && num[i] < min)) {
- min = num[i];
- j = i;
- }
- }
-
- if (min && !quiet)
- fwrite_unlocked (buf[j]+TIMESTAMP_SIZE, length[j], 1, stdout);
- if (min && !print_only)
- fwrite_unlocked (buf[j]+TIMESTAMP_SIZE, length[j], 1, ofp);
-
- if (min && ++count != min) {
- count = min;
- dropped++ ;
- }
-
- num[j] = 0;
- if (fread_unlocked (&length[j], sizeof(uint32_t), 1, fp[j])) {
- if (fread_unlocked (buf[j], length[j]+TIMESTAMP_SIZE, 1, fp[j]))
- num[j] = *((uint32_t *)buf[j]);
- }
- } while (min);
-
- if (!print_only)
- fwrite_unlocked ("\n", 1, 1, ofp);
-
- for (i = 0; i < ncpus; i++)
- fclose (fp[i]);
- fclose (ofp);
-
- if (dropped)
- fprintf (stderr, "Sequence had %d drops.\n", dropped);
-
- return 0;
-}
-
-void cleanup_and_exit (int closed)
-{
- char tmpbuf[128];
- pid_t err;
-
- if (exiting)
- return;
- exiting = 1;
-
- dbug("CLEANUP AND EXIT closed=%d mode=%d\n", closed, transport_mode);
-
- /* what about child processes? we will wait for them here. */
- err = waitpid(-1, NULL, WNOHANG);
- if (err >= 0)
- fprintf(stderr,"\nWaititing for processes to exit\n");
- while(wait(NULL) > 0);
-
- if (transport_mode == STP_TRANSPORT_RELAYFS && relay_file[0] > 0)
- wait_for_percpu_threads(ncpus);
-
- close_proc_files();
-
- if (print_totals && verbose)
- summarize();
-
- if (transport_mode == STP_TRANSPORT_RELAYFS && relay_file[0] > 0) {
- close_all_relayfs_files();
- if (params.merge) {
- merge_output();
- delete_percpu_files();
- }
- }
-
- dbug("closing control channel\n");
- close(control_channel);
-
- if (!closed) {
- snprintf(tmpbuf, sizeof(tmpbuf), "/sbin/rmmod -w %s", modname);
- if (system(tmpbuf)) {
- fprintf(stderr, "ERROR: couldn't rmmod probe module %s. No output will be written.\n",
- modname);
- exit(1);
- }
- }
- exit(0);
-}
-
-static void sigproc(int signum)
-{
- if (signum == SIGCHLD) {
- pid_t pid = waitpid(-1, NULL, WNOHANG);
- if (pid != target_pid)
- return;
- }
- send_request(STP_EXIT, NULL, 0);
-}
-
-static void driver_poll (int signum __attribute__((unused)))
-{
- /* See if the driver process is still alive. If not, time to exit. */
- if (kill (driver_pid, 0) < 0) {
- send_request(STP_EXIT, NULL, 0);
- return;
- } else {
- /* Check again later. Use any reasonable poll interval */
- signal (SIGALRM, driver_poll);
- alarm (10);
- }
-}
-
-
-/**
- * stp_main_loop - loop forever reading data
- */
-static char recvbuf[8192];
-
-int stp_main_loop(void)
-{
- int nb, rc;
- void *data;
- int type;
- FILE *ofp = stdout;
-
- setvbuf(ofp, (char *)NULL, _IOLBF, 0);
-
- signal(SIGINT, sigproc);
- signal(SIGTERM, sigproc);
- signal(SIGCHLD, sigproc);
- signal(SIGHUP, sigproc);
-
- if (driver_pid)
- driver_poll(0); // And by the way, I'm also the signal handler.
-
- dbug("in main loop\n");
-
- while (1) { /* handle messages from control channel */
- nb = read(control_channel, recvbuf, sizeof(recvbuf));
- if (nb <= 0) {
- perror("recv");
- fprintf(stderr, "WARNING: unexpected EOF. nb=%d\n", nb);
- continue;
- }
-
- type = *(int *)recvbuf;
- data = (void *)(recvbuf + sizeof(int));
-
- if (!transport_mode && type != STP_TRANSPORT_INFO && type != STP_EXIT) {
- fprintf(stderr, "WARNING: invalid stp command: no transport\n");
- continue;
- }
-
- switch (type) {
- case STP_REALTIME_DATA:
- fwrite_unlocked(data, nb - sizeof(int), 1, ofp);
- break;
- case STP_OOB_DATA:
- fputs ((char *)data, stderr);
- break;
- case STP_EXIT:
- {
- /* module asks us to unload it and exit */
- int *closed = (int *)data;
- cleanup_and_exit(*closed);
- break;
- }
- case STP_START:
- {
- struct _stp_transport_start *t = (struct _stp_transport_start *)data;
- dbug("probe_start() returned %d\n", t->pid);
- if (t->pid < 0) {
- if (target_cmd)
- kill (target_pid, SIGKILL);
- cleanup_and_exit(0);
- } else if (target_cmd)
- kill (target_pid, SIGUSR1);
- break;
- }
- case STP_SYSTEM:
- {
- struct _stp_cmd_info *c = (struct _stp_cmd_info *)data;
- system_cmd(c->cmd);
- break;
- }
- case STP_TRANSPORT_INFO:
- {
- struct _stp_transport_info *info = (struct _stp_transport_info *)data;
- struct _stp_transport_start ts;
- transport_mode = info->transport_mode;
- params.subbuf_size = info->subbuf_size;
- params.n_subbufs = info->n_subbufs;
- params.merge = info->merge;
-#ifdef DEBUG
- if (transport_mode == STP_TRANSPORT_RELAYFS) {
- fprintf(stderr,"TRANSPORT_INFO recvd: RELAYFS %d bufs of %d bytes.\n",
- params.n_subbufs,
- params.subbuf_size);
- if (params.merge)
- fprintf(stderr,"Merge output\n");
- } else
- fprintf(stderr,"TRANSPORT_INFO recvd: PROC with %d Mbyte buffers.\n",
- info->buf_size);
-#endif
- if (!streaming()) {
- rc = init_relayfs();
- if (rc < 0) {
- fprintf(stderr, "ERROR: couldn't init relayfs, exiting\n");
- cleanup_and_exit(0);
- }
- } else if (outfile_name) {
- ofp = fopen (outfile_name, "w");
- if (!ofp) {
- fprintf (stderr, "ERROR: couldn't open output file %s: errcode = %s\n",
- outfile_name, strerror(errno));
- cleanup_and_exit(0);
- }
- }
- ts.pid = getpid();
- send_request(STP_START, &ts, sizeof(ts));
- break;
- }
- case STP_MODULE:
- {
- struct _stp_transport_start ts;
- if (do_module(data)) {
- ts.pid = getpid();
- send_request(STP_START, &ts, sizeof(ts));
- }
- break;
- }
- case STP_SYMBOLS:
- {
- struct _stp_symbol_req *req = (struct _stp_symbol_req *)data;
- struct _stp_transport_start ts;
- dbug("STP_SYMBOLS request received\n");
- if (req->endian != 0x1234) {
- fprintf(stderr,"ERROR: staprun is compiled with different endianess than the kernel!\n");
- cleanup_and_exit(0);
- }
- if (req->ptr_size != sizeof(char *)) {
- fprintf(stderr,"ERROR: staprun is compiled with %d-bit pointers and the kernel uses %d-bit.\n",
- 8*sizeof(char *), 8*req->ptr_size);
- cleanup_and_exit(0);
- }
- do_kernel_symbols();
- ts.pid = getpid();
- send_request(STP_START, &ts, sizeof(ts));
- break;
- }
- default:
- fprintf(stderr, "WARNING: ignored message of type %d\n", (type));
- }
- }
- fclose(ofp);
- return 0;
-}
+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <string.h>
-#include <stdint.h>
-
-#include "../transport/transport_msgs.h"
-
-#ifdef DEBUG
-#define dbug(args...) {fprintf(stderr,"%s:%d ",__FUNCTION__, __LINE__); fprintf(stderr,args); }
-#else
-#define dbug(args...) ;
-#endif /* DEBUG */
-
-/*
- * functions
- */
-int init_stp(int print_summary);
-int stp_main_loop(void);
-int send_request(int type, void *data, int len);
-void cleanup_and_exit (int);
-int do_module(void *);
-void do_kernel_symbols(void);
-
-/*
- * variables
- */
-extern int control_channel;
+++ /dev/null
-/*
- * stp_dump.c - stp data dump program
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) Red Hat Inc, 2005
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-
-static void usage (char *prog)
-{
- fprintf(stderr, "%s input_file \n", prog);
- exit(1);
-}
-
-#define TIMESTAMP_SIZE (sizeof(int))
-
-int main (int argc, char *argv[])
-{
- char buf[32];
- int c, seq, lastseq = 0;
- FILE *fp;
-
- if (argc != 2)
- usage(argv[0]);
-
- fp = fopen(argv[1], "r");
- if (!fp) {
- fprintf(stderr, "ERROR: couldn't open input file %s: errcode = %s\n",
- argv[1], strerror(errno));
- return -1;
- }
-
- while (1) {
- int numbytes = 0;
-
- if (fread (buf, TIMESTAMP_SIZE, 1, fp))
- seq = *((int *)buf);
- else
- break;
-
- if (seq < lastseq)
- fprintf(stderr, "WARNING: seq %d followed by %d\n", lastseq, seq);
- lastseq = seq;
-
- while (1) {
- c = fgetc_unlocked(fp);
- if (c == 0 || c == EOF)
- break;
- numbytes++;
- }
- printf ("<%d><%d BYTES>", seq, numbytes);
- if (c == 0)
- printf ("<0>\n");
- else {
- printf ("<EOF>\n");
- break;
- }
- }
-
- printf ("DONE\n");
- fclose (fp);
- return 0;
-}
+++ /dev/null
-/*
- * stp_merge.c - stp merge program
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) Red Hat Inc, 2005
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-
-static void usage (char *prog)
-{
- fprintf(stderr, "%s [-o output_filename] input_files ...\n", prog);
- exit(1);
-}
-
-#define TIMESTAMP_SIZE (sizeof(int))
-#define NR_CPUS 256
-
-int main (int argc, char *argv[])
-{
- char *outfile_name = NULL;
- char buf[32];
- int c, i, j, dropped=0;
- long count=0, min, num[NR_CPUS];
- FILE *ofp, *fp[NR_CPUS];
- int ncpus;
-
- while ((c = getopt (argc, argv, "o:")) != EOF) {
- switch (c) {
- case 'o':
- outfile_name = optarg;
- break;
- default:
- usage(argv[0]);
- }
- }
-
- if (optind == argc)
- usage (argv[0]);
-
- i = 0;
- while (optind < argc) {
- fp[i] = fopen(argv[optind++], "r");
- if (!fp[i]) {
- fprintf(stderr, "error opening file %s.\n", argv[optind - 1]);
- return -1;
- }
- if (fread (buf, TIMESTAMP_SIZE, 1, fp[i]))
- num[i] = *((int *)buf);
- else
- num[i] = 0;
- i++;
- }
- ncpus = i;
-
- if (!outfile_name)
- ofp = stdout;
- else {
- ofp = fopen(outfile_name, "w");
- if (!ofp) {
- fprintf(stderr, "ERROR: couldn't open output file %s: errcode = %s\n",
- outfile_name, strerror(errno));
- return -1;
- }
- }
-
- do {
- min = num[0];
- j = 0;
- for (i = 1; i < ncpus; i++) {
- if (min == 0 || (num[i] && num[i] < min)) {
- min = num[i];
- j = i;
- }
- }
-
- while (1) {
- c = fgetc_unlocked(fp[j]);
- if (c == 0 || c == EOF)
- break;
- fputc_unlocked (c, ofp);
- }
-
- if (min && ++count != min) {
- fprintf(stderr, "got %ld. expected %ld\n", min, count);
- dropped += min - count ;
- count = min;
- }
-
- if (fread (buf, TIMESTAMP_SIZE, 1, fp[j]))
- num[j] = *((int *)buf);
- else
- num[j] = 0;
- } while (min);
-
- fputs ("\n", ofp);
-
- for (i = 0; i < ncpus; i++)
- fclose (fp[i]);
- fclose (ofp);
- printf ("sequence had %d drops\n", dropped);
- return 0;
-}
+++ /dev/null
-/*
- * stp.c - stp 'daemon'
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) 2005 IBM Corporation
- * Copyright (C) 2005-2006 Red Hat, Inc.
- *
- */
-
-#include "librelay.h"
-#include <pwd.h>
-
-extern char *optarg;
-extern int optopt;
-extern int optind;
-
-int print_only = 0;
-int quiet = 0;
-int verbose = 0;
-int target_pid = 0;
-int driver_pid = 0;
-unsigned int buffer_size = 0;
-char *modname = NULL;
-char *modpath = NULL;
-#define MAXMODOPTIONS 64
-char *modoptions[MAXMODOPTIONS];
-char *target_cmd = NULL;
-char *outfile_name = NULL;
-char *username = NULL;
-uid_t cmd_uid;
-gid_t cmd_gid;
-
-static void usage(char *prog)
-{
- fprintf(stderr, "\n%s [-m] [-p] [-q] [-r] [-c cmd ] [-t pid]\n"
- "\t[-b bufsize] [-o FILE] kmod-name [kmod-options]\n", prog);
- fprintf(stderr, "-p Print only. Don't log to files.\n");
- fprintf(stderr, "-q Quiet. Don't display trace to stdout.\n");
- fprintf(stderr, "-c cmd. Command \'cmd\' will be run and staprun will exit when it does.\n");
- fprintf(stderr, " _stp_target will contain the pid for the command.\n");
- fprintf(stderr, "-t pid. Sets _stp_target to pid.\n");
- fprintf(stderr, "-d pid. Pass the systemtap driver's pid.\n");
- fprintf(stderr, "-o FILE. Send output to FILE.\n");
- fprintf(stderr, "-u username. Run commands as username.\n");
- fprintf(stderr, "-b buffer size. The systemtap module will specify a buffer size.\n");
- fprintf(stderr, " Setting one here will override that value. The value should be\n");
- fprintf(stderr, " an integer between 1 and 64 which be assumed to be the\n");
- fprintf(stderr, " buffer size in MB. That value will be per-cpu if relayfs is used.\n");
- exit(1);
-}
-
-int main(int argc, char **argv)
-{
- int c;
-
- while ((c = getopt(argc, argv, "mpqrb:n:t:d:c:vo:u:")) != EOF)
- {
- switch (c) {
- case 'm':
- fprintf(stderr, "Warning: -m option deprecated. Ignoring...\n");
- break;
- case 'p':
- print_only = 1;
- break;
- case 'q':
- quiet = 1;
- break;
- case 'v':
- verbose = 1;
- break;
- case 'r':
- fprintf(stderr, "Warning: -r option deprecated. Ignoring...\n");
- break;
- case 'b':
- {
- int size = (unsigned)atoi(optarg);
- if (!size)
- usage(argv[0]);
- if (size > 64) {
- fprintf(stderr, "Maximum buffer size is 64 (MB)\n");
- exit(1);
- }
- buffer_size = size;
- break;
- }
- case 't':
- target_pid = atoi(optarg);
- break;
- case 'd':
- driver_pid = atoi(optarg);
- break;
- case 'c':
- target_cmd = optarg;
- break;
- case 'o':
- outfile_name = optarg;
- break;
- case 'u':
- username = optarg;
- break;
- default:
- usage(argv[0]);
- }
- }
-
- if (verbose) {
- if (buffer_size)
- printf ("Using a buffer of %u bytes.\n", buffer_size);
- }
-
- if (optind < argc)
- {
- /* Collect both full path and just the trailing module name. */
- modpath = argv[optind++];
- modname = rindex (modpath, '/');
- if (modname == NULL)
- modname = modpath;
- else
- modname++; /* skip over / */
- }
-
- if (optind < argc)
- {
- unsigned start_idx = 3; /* reserve three slots in modoptions[] */
- while (optind < argc && start_idx+1 < MAXMODOPTIONS)
- modoptions[start_idx++] = argv[optind++];
- /* Redundantly ensure that there is a NULL pointer at the end
- of modoptions[]. */
- modoptions[start_idx] = NULL;
- }
-
- if (!modname) {
- fprintf (stderr, "Cannot invoke daemon without probe module\n");
- usage(argv[0]);
- }
-
- if (print_only && quiet) {
- fprintf (stderr, "Cannot do \"-p\" and \"-q\" both.\n");
- usage(argv[0]);
- }
-
- if (username) {
- struct passwd *pw = getpwnam(username);
- if (!pw) {
- fprintf(stderr, "Cannot find user \"%s\".\n", username);
- exit(1);
- }
- cmd_uid = pw->pw_uid;
- cmd_gid = pw->pw_gid;
- } else {
- cmd_uid = getuid();
- cmd_gid = getgid();
- }
-
- if (init_stp(!quiet)) {
- //fprintf(stderr, "Couldn't initialize staprun. Exiting.\n");
- exit(1);
- }
-
- if (stp_main_loop()) {
- fprintf(stderr,"Couldn't enter main loop. Exiting.\n");
- exit(1);
- }
-
- return 0;
-}
+++ /dev/null
-/* -*- linux-c -*-
- * Symbols and modules functions for staprun.
- *
- * Copyright (C) 2006 Red Hat Inc.
- *
- * This file is part of systemtap, and is free software. You can
- * redistribute it and/or modify it under the terms of the GNU General
- * Public License (GPL); either version 2, or (at your option) any
- * later version.
- */
-
-#include "librelay.h"
-#include "../sym.h"
-
-static int send_data(void *data, int len)
-{
- return write(control_channel, data, len);
-}
-
-/* Get the sections for a module. Put them in the supplied buffer */
-/* in the following order: */
-/* [struct _stp_module][struct _stp_symbol sections ...][string data] */
-/* Return the total length of all the data. */
-
-#define SECDIR "/sys/module/%s/sections"
-static int get_sections(char *name, char *data_start, int datalen)
-{
- char dir[STP_MODULE_NAME_LEN + sizeof(SECDIR)];
- char filename[STP_MODULE_NAME_LEN + 256];
- char buf[32], strdata_start[4096];
- char *strdata=strdata_start, *data=data_start;
- int fd, len, res;
- struct _stp_module *mod = (struct _stp_module *)data_start;
- struct dirent *d;
- DIR *secdir;
- struct _stp_symbol *sec;
-
- /* start of data is a struct _stp_module */
- data += sizeof(struct _stp_module);
-
- res = snprintf(dir, sizeof(dir), SECDIR, name);
- if (res >= sizeof(dir)) {
- fprintf(stderr, "ERROR: couldn't fit module \"%s\" into dir buffer.\n", name);
- fprintf(stderr, "This should never happen. Please file a bug report.\n");
- cleanup_and_exit(0);
- }
-
- if ((secdir = opendir(dir)) == NULL)
- return 0;
-
- memset(mod, 0, sizeof(struct _stp_module));
- strncpy(mod->name, name, STP_MODULE_NAME_LEN);
-
- while ((d = readdir(secdir))) {
- char *secname = d->d_name;
- res = snprintf(filename, sizeof(filename), "/sys/module/%s/sections/%s", name, secname);
- if (res >= sizeof(filename)) {
- fprintf(stderr, "ERROR: couldn't fit secname \"%s\" into filename buffer.\n", secname);
- fprintf(stderr, "This should never happen. Please file a bug report.\n");
- closedir(secdir);
- cleanup_and_exit(0);
- }
- if ((fd = open(filename,O_RDONLY)) >= 0) {
- if (read(fd, buf, 32) > 0) {
- /* filter out some non-useful stuff */
- if (!strncmp(secname,"__",2)
- || !strcmp(secname,".module_sig")
- || !strcmp(secname,".modinfo")
- || !strcmp(secname,".strtab")
- || !strcmp(secname,".symtab") ) {
- close(fd);
- continue;
- }
- /* create next section */
- sec = (struct _stp_symbol *)data;
- data += sizeof(struct _stp_symbol);
- sec->addr = strtoul(buf,NULL,16);
- sec->symbol = (char *)(strdata - strdata_start);
- mod->num_sections++;
-
- /* now create string data for the section */
- strcpy(strdata, secname);
- strdata += strlen(secname) + 1;
-
- /* These sections are used a lot so keep the values handy */
- if (!strcmp(secname, ".data"))
- mod->data = sec->addr;
- if (!strcmp(secname, ".text"))
- mod->text = sec->addr;
- if (!strcmp(secname, ".gnu.linkonce.this_module"))
- mod->module = sec->addr;
- }
- close(fd);
- }
- }
- closedir(secdir);
-
- /* consolidate buffers */
- len = strdata - strdata_start;
- if ((len + data - data_start) > datalen) {
- fprintf(stderr, "ERROR: overflowed buffers in get_sections. Size needed = %d\n",
- (int)(len + data - data_start));
- cleanup_and_exit(0);
- }
- strdata = strdata_start;
- while (len--)
- *data++ = *strdata++;
-
- return data - data_start;
-}
-#undef SECDIR
-
-void send_module (char *modname)
-{
- char data[8192];
- int len = get_sections(modname, data, sizeof(data));
- if (len)
- send_request(STP_MODULE, data, len);
-}
-
-int do_module (void *data)
-{
- struct _stp_module *mod = (struct _stp_module *)data;
-
- if (mod->name[0] == 0) {
- struct dirent *d;
- DIR *moddir = opendir("/sys/module");
- if (moddir) {
- while ((d = readdir(moddir)))
- send_module(d->d_name);
- closedir(moddir);
- }
- return 1;
- }
-
- send_module(mod->name);
- return 0;
-}
-
-static int compar(const void *p1, const void *p2)
-{
- struct _stp_symbol *s1 = (struct _stp_symbol *)p1;
- struct _stp_symbol *s2 = (struct _stp_symbol *)p2;
- if (s1->addr == s2->addr) return 0;
- if (s1->addr < s2->addr) return -1;
- return 1;
-}
-
-#define MAX_SYMBOLS 32768
-
-void do_kernel_symbols(void)
-{
- FILE *kallsyms;
- char *sym_base, *data_base;
- char buf[128], *ptr, *name, *data, *dataptr, *datamax, type;
- unsigned long addr;
- struct _stp_symbol *syms;
- int num_syms, i = 0;
-
- sym_base = malloc(MAX_SYMBOLS*sizeof(struct _stp_symbol)+sizeof(long));
- data_base = malloc(MAX_SYMBOLS*32);
- if (data_base == NULL || sym_base == NULL) {
- fprintf(stderr,"Failed to allocate memory for symbols\n");
- cleanup_and_exit(0);
- }
- *(int *)data_base = STP_SYMBOLS;
- dataptr = data = data_base + sizeof(long);
- datamax = dataptr + MAX_SYMBOLS*32 - sizeof(long);
-
- *(int *)sym_base = STP_SYMBOLS;
- syms = (struct _stp_symbol *)(sym_base + sizeof(long));
-
- kallsyms = fopen ("/proc/kallsyms", "r");
- if (!kallsyms) {
- perror("Fatal error: Unable to open /proc/kallsyms:");
- cleanup_and_exit(0);
- }
-
- /* put empty string in data */
- *dataptr++ = 0;
-
- while (fgets_unlocked(buf, 128, kallsyms) && dataptr < datamax) {
- addr = strtoul(buf, &ptr, 16);
- while (isspace(*ptr)) ptr++;
- type = *ptr++;
- if (type == 't' || type == 'T' || type == 'A') {
- while (isspace(*ptr)) ptr++;
- name = ptr++;
- while (!isspace(*ptr)) ptr++;
- *ptr++ = 0;
- while (*ptr && *ptr != '[') ptr++;
- if (*ptr)
- continue; /* it was a module */
- syms[i].addr = addr;
- syms[i].symbol = (char *)(dataptr - data);
- while (*name) *dataptr++ = *name++;
- *dataptr++ = 0;
- i++;
- if (dataptr > datamax - 1000)
- break;
- }
- }
- num_syms = i;
- qsort(syms, num_syms, sizeof(struct _stp_symbol), compar);
-
-#if 0
- for (i=0;i<num_syms;i++) {
- fprintf(stderr,"%p , \"%s\"\n", (char *)(syms[i].addr),
- (char *)((long)(syms[i].symbol) + data));
- }
-#endif
-
- /* send header */
- *(int *)buf = STP_SYMBOLS;
- *(int *)(buf+sizeof(long)) = num_syms;
- *(int *)(buf+sizeof(long)+sizeof(int)) = (unsigned)(dataptr - data);
- send_data(buf, 2*sizeof(int)+sizeof(long));
-
- /* send syms */
- send_data(sym_base, num_syms*sizeof(struct _stp_symbol)+sizeof(long));
-
- /* send data */
- send_data(data_base, dataptr-data+sizeof(long));
-
- free(data_base);
- free(sym_base);
- fclose(kallsyms);
-
- if (dataptr >= datamax) {
- fprintf(stderr,"Error: overflowed symbol data area.\n");
- cleanup_and_exit(0);
- }
-}
git://sourceware.org / systemtap.git / commitdiff