Merge pull request #929 from sf1999817/develop

fs_watcher: add fs_watcher to MagicEyes
linuxkerneltravel · Oct 23, 2024 · 78c5150 · 78c5150
2 parents d8a170b + 1fce494
commit 78c5150
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Showing 8 changed files with 890 additions and 76 deletions.
diff --git a/MagicEyes/src/backend/fs/fs_watcher/bpf/CacheTrack.bpf.c b/MagicEyes/src/backend/fs/fs_watcher/bpf/CacheTrack.bpf.c
@@ -0,0 +1,120 @@
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+#include "fs_watcher.h"
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+// struct {
+// 	__uint(type, BPF_MAP_TYPE_HASH);
+// 	__uint(max_entries, 1024);
+// 	__type(key, char[30] );
+// 	__type(value,struct event_CacheTrack);
+// } data SEC(".maps");
+
+// struct {
+// 	__uint(type, BPF_MAP_TYPE_HASH);
+// 	__uint(max_entries, 1024);
+// 	__type(key, u64 );
+// 	__type(value,struct event_CacheTrack);
+// } unique_map SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, 256 * 1024);
+} rb SEC(".maps");
+
+
+SEC("tracepoint/writeback/writeback_dirty_inode_start")
+int trace_writeback_start(struct trace_event_raw_writeback_dirty_inode_template  *ctx){
+    pid_t pid = bpf_get_current_pid_tgid() >> 32;
+    u64 timestamp = bpf_ktime_get_ns();
+    struct event_CacheTrack event_info ={};
+    char name[32];
+
+    event_info.ino = ctx->ino;
+
+    event_info.state = ctx->state;
+
+    event_info.flags = ctx->flags;
+
+    event_info.time = timestamp;
+
+    // bpf_probe_read(name, sizeof(name), ctx->name);  // 从 ctx 复制设备名称
+
+    // 检查 name 是否为空字符串
+    // if (name[0] == '\0') {
+    //     return 0;
+    // }
+    // if(name == NULL)
+    //     return 0;
+
+    // __builtin_memcpy(event_info.name, name, sizeof(name));
+    // bpf_printk("comm_123:%s\n",event_info.name);
+
+    struct event_CacheTrack *ring_event = bpf_ringbuf_reserve(&rb, sizeof(struct event_CacheTrack), 0);
+    if (!ring_event)
+        return 0;
+
+    __builtin_memcpy(ring_event, &event_info, sizeof(event_info));
+
+    bpf_printk("event_info_ino:%d\n",event_info.ino);
+
+    bpf_ringbuf_submit(ring_event, 0);
+
+
+    // bpf_map_update_elem(&data,name,&event_info,BPF_ANY);
+    // bpf_map_update_elem(&unique_map,&event_info.queue_id,&event_info,BPF_ANY);
+    return 0;
+}
+
+// SEC("tracepoint/writeback/writeback_written")
+// int trace_writeback_end(struct trace_event_raw_writeback_work_class *ctx) {
+//     bpf_printk("2222222\n");
+//     u64 timestamp = bpf_ktime_get_ns();
+//     char name[30];
+//     bpf_probe_read_str(name, sizeof(name), ctx->name);  // 从 ctx 复制设备名称
+
+//     if(name == NULL)
+//         return 0;
+
+//     bpf_printk("comm:%s\n",name);
+
+//     struct event_CacheTrack *e = bpf_map_lookup_elem(&data,name);
+//     if(!e){
+//         bpf_printk("e failed\n");
+//         return 0;
+//     }
+
+
+//     struct event_CacheTrack *q = bpf_map_lookup_elem(&unique_map,&e->queue_id);
+//     if(!q){
+//         bpf_printk("q failed\n");
+//         return 0;
+//     }
+
+//     struct event_CacheTrack *q_event = bpf_ringbuf_reserve(&rb, sizeof(struct event_CacheTrack), 0);
+//     if (!q_event){
+//         bpf_printk("Ring buffer is full!\n");
+//         return 0;
+//     }
+
+//     q_event->nr_pages = ctx->nr_pages;
+//     q_event->sb_dev = ctx->sb_dev;              
+//     q_event->sync_mode = ctx->sync_mode;        
+//     q_event->for_kupdate = ctx->for_kupdate;    
+//     q_event->range_cyclic = ctx->range_cyclic;  
+//     q_event->for_background = ctx->for_background; 
+//     q_event->reason = ctx->reason;                
+//     q_event->cgroup_ino = ctx->cgroup_ino;      
+//     q_event->time = timestamp - q->start_timestamp; 
+
+//     bpf_printk("time:%llu\n",q_event->time);
+//     bpf_printk("123\n");
+
+//     bpf_ringbuf_submit(q_event, 0);
+
+//     return 0;
+
+// }
diff --git a/MagicEyes/src/backend/fs/fs_watcher/bpf/block_rq_issue.bpf.c b/MagicEyes/src/backend/fs/fs_watcher/bpf/block_rq_issue.bpf.c
@@ -0,0 +1,69 @@
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+#include "fs_watcher.h"
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+struct {
+    __uint(type, BPF_MAP_TYPE_RINGBUF);
+    __uint(max_entries, 256 * 1024);
+} rb SEC(".maps");
+
+struct {
+    __uint(type, BPF_MAP_TYPE_HASH);
+    __uint(max_entries, 1024); 
+    __type(key, u32);  // 使用进程 PID 作为键
+    __type(value, u64); // I/O 总大小作为值
+} io_size_map SEC(".maps");
+
+SEC("tracepoint/block/block_rq_issue")
+int tracepoint_block_rq_issue(struct trace_event_raw_block_rq_completion *ctx) {
+    struct event_block_rq_issue *e;
+    u32 pid = bpf_get_current_pid_tgid() >> 32;  // 获取进程 ID
+    u64 *size, total_size;
+
+    // 分配 ringbuf 空间
+    e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0);
+    if (!e) {
+        return 0;  // 如果分配失败，提前返回
+    }
+
+    // 获取当前进程名
+    bpf_get_current_comm(e->comm, sizeof(e->comm));
+
+    // 填充事件数据
+    e->timestamp = bpf_ktime_get_ns();
+    e->dev = ctx->dev;  
+    e->sector = ctx->sector;  
+    e->nr_sectors = ctx->nr_sector;  
+
+    // 日志输出调试信息
+    bpf_printk("PID: %u, Sector: %d, nr_sectors: %d\n", pid, ctx->sector, ctx->nr_sector);
+
+    // 查找或初始化该进程的 I/O 总大小
+    size = bpf_map_lookup_elem(&io_size_map, &pid);
+    if (size) {
+        total_size = *size;
+    } else {
+        total_size = 0;
+    }
+
+    // 计算本次 I/O 请求的大小
+    const u64 sector_size = 512; // 标准扇区大小
+    total_size += ctx->nr_sector * sector_size;
+
+    // 更新 I/O 总大小
+    bpf_map_update_elem(&io_size_map, &pid, &total_size, BPF_ANY);
+
+    e->total_io = total_size;
+
+    // 日志输出当前总 I/O 大小
+    bpf_printk("Updated Total I/O for PID %u: %llu\n", pid, total_size);
+
+    // 提交事件
+    bpf_ringbuf_submit(e, 0);
+
+    return 0;
+}
diff --git a/MagicEyes/src/backend/fs/fs_watcher/bpf/disk_io_visit.bpf.c b/MagicEyes/src/backend/fs/fs_watcher/bpf/disk_io_visit.bpf.c
@@ -0,0 +1,71 @@
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+#include "fs_watcher.h"
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+// 定义 ringbuf，用于传输事件信息
+struct {
+    __uint(type, BPF_MAP_TYPE_RINGBUF);
+    __uint(max_entries, 256 * 1024);
+} rb SEC(".maps");
+
+// 进程名与 I/O 计数映射
+struct {
+    __uint(type, BPF_MAP_TYPE_HASH);
+    __uint(max_entries, 1024);
+    __type(key, char[TASK_COMM_LEN]);
+    __type(value, u32);
+} io_count_map SEC(".maps");
+
+// 这里挂载点得是这个struct trace_event_raw_block_rq_completion *ctx
+SEC("tracepoint/block/block_rq_complete")
+int tracepoint_block_visit(struct trace_event_raw_block_rq_completion *ctx) {
+    struct event_disk_io_visit  *e;
+    u32 *count, new_count;
+    char comm[TASK_COMM_LEN];
+
+    // 获取当前进程名
+    bpf_get_current_comm(comm, sizeof(comm));
+
+    // 查找或初始化该进程的I/O计数
+    count = bpf_map_lookup_elem(&io_count_map, comm);
+    if (count) {
+        new_count = *count + 1;
+    } else {
+        new_count = 1;
+    }
+    bpf_map_update_elem(&io_count_map, comm, &new_count, BPF_ANY);
+
+    // 分配 ringbuf 空间
+    e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0);
+    if (!e) {
+        return 0;  // 如果分配失败，提前返回
+    }
+
+    // 填充事件数据
+    e->timestamp = bpf_ktime_get_ns();
+    e->blk_dev = ctx->dev;  // 直接读取块设备号
+    e->sectors = ctx->nr_sector;  // 读取操作的扇区数
+
+    // 判断读写标识符 (检查 rwbs 数组的内容)
+    if (ctx->rwbs[0] == 'R') {
+        e->rwbs = 1;  // 1 表示读操作
+    } else {
+        e->rwbs = 0;  // 0 表示写操作
+    }
+
+    // 更新 I/O 操作计数
+    e->count = new_count;
+
+    // 复制进程名
+    __builtin_memcpy(e->comm, comm, sizeof(comm));
+    bpf_printk("comm : %s\n",e->comm);
+
+    // 提交事件
+    bpf_ringbuf_submit(e, 0);
+
+    return 0;
+}
diff --git a/MagicEyes/src/backend/fs/fs_watcher/bpf/open.bpf.c b/MagicEyes/src/backend/fs/fs_watcher/bpf/open.bpf.c
@@ -1,63 +1,71 @@
-#include "vmlinux.h"
-#include <bpf/bpf_helpers.h>		//包含了BPF 辅助函数
+#define BPF_NO_GLOBAL_DATA
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
-#include "open.h"
+#include <bpf/bpf_core_read.h>
+#include "fs_watcher.h"
 
-char LICENSE[] SEC("license") = "Dual BSD/GPL";
+#define TASK_COMM_LEN 100
+#define path_size 256
 
-// 定义哈希映射
 struct {
 	__uint(type, BPF_MAP_TYPE_HASH);
 	__uint(max_entries, 1024);
 	__type(key, pid_t);
-	__type(value, u64);
-} fdtmp SEC(".maps");
+	__type(value, char[TASK_COMM_LEN]);
+} data SEC(".maps");
 
 struct {
 	__uint(type, BPF_MAP_TYPE_RINGBUF);
 	__uint(max_entries, 256 * 1024);
-} rb SEC(".maps");
-
-SEC("kprobe/do_sys_openat2")
-int BPF_KPROBE(do_sys_openat2)
-{	
-    	struct fs_t fs; 
-    	pid_t pid;
-
-    	//pid
-    	pid = bpf_get_current_pid_tgid() >> 32;
-    	fs.pid = pid;
-
-    	//uid
-    	fs.uid = bpf_get_current_uid_gid();
-
-	//fd,file descriptor
-    	int fd = PT_REGS_RC(ctx);
-    	if (fd >= 0)
-        	fs.fd = fd;
-    	else
-        	fs.fd= -1;
-
-        //time
-        unsigned long long ts = bpf_ktime_get_ns();
-	fs.ts = ts;
-    	bpf_map_update_elem(&fdtmp, &pid, &ts, BPF_ANY);
-
-	//从环形缓冲区（ring buffer）中分配一块内存来存储一个名为 struct fs_t 类型的数据，并将该内存块的指针赋值给指针变量 e
-	struct fs_t *e;
+} rb SEC(".maps"); // 环形缓冲区
+
+
+SEC("tracepoint/syscalls/sys_enter_openat")
+int do_syscall_trace(struct trace_event_raw_sys_enter *ctx)
+{
+	struct event_open *e;
+    char comm[TASK_COMM_LEN];
+    bpf_get_current_comm(&comm,sizeof(comm));
 	e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0);
-	if (!e)	return 0;	
-
-	//给变量e赋值
-	e->pid = fs.pid;
-	e->uid = fs.uid;
-	e->fd = fs.fd;
-	e->ts = fs.ts;
-	bpf_get_current_comm(e->comm, sizeof(e->comm));
-
-	// 成功地将其提交到用户空间进行后期处理
+	if (!e)
+		return 0;
+
+	char filename[path_size];
+	struct task_struct *task = (struct task_struct *)bpf_get_current_task(),
+			   *real_parent;
+	if (task == NULL) {
+		bpf_printk("task\n");
+		bpf_ringbuf_discard(e, 0);
+		return 0;
+	}
+	int pid = bpf_get_current_pid_tgid() >> 32, tgid;
+
+    bpf_map_update_elem(&data, &pid, &comm, BPF_ANY);
+
+	int ppid = BPF_CORE_READ(task, real_parent, tgid);
+
+	bpf_probe_read_str(e->path_name_, sizeof(e->path_name_),
+			   (void *)(ctx->args[1]));
+
+	bpf_printk("path name: %s,pid:%d,ppid:%d\n", e->path_name_, pid, ppid);
+
+	struct fdtable *fdt = BPF_CORE_READ(task, files, fdt);
+	if (fdt == NULL) {
+		bpf_printk("fdt\n");
+		bpf_ringbuf_discard(e, 0);
+		return 0;
+	}
+
+	unsigned int i = 0, count = 0, n = BPF_CORE_READ(fdt, max_fds);
+	bpf_printk("n:%d\n", n);
+
+	e->n_ = n;
+	e->pid_ = pid;
+
 	bpf_ringbuf_submit(e, 0);
 
-    	return 0;
+	return 0;
 }
 
+char LICENSE[] SEC("license") = "GPL";