1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * f2fs IO tracer
4 *
5 * Copyright (c) 2014 Motorola Mobility
6 * Copyright (c) 2014 Jaegeuk Kim <jaegeuk@kernel.org>
7 */
8 #include <linux/fs.h>
9 #include <linux/f2fs_fs.h>
10 #include <linux/sched.h>
11 #include <linux/radix-tree.h>
12
13 #include "f2fs.h"
14 #include "trace.h"
15
16 static RADIX_TREE(pids, GFP_ATOMIC);
17 static spinlock_t pids_lock;
18 static struct last_io_info last_io;
19
__print_last_io(void)20 static inline void __print_last_io(void)
21 {
22 if (!last_io.len)
23 return;
24
25 trace_printk("%3x:%3x %4x %-16s %2x %5x %5x %12x %4x\n",
26 last_io.major, last_io.minor,
27 last_io.pid, "----------------",
28 last_io.type,
29 last_io.fio.op, last_io.fio.op_flags,
30 last_io.fio.new_blkaddr,
31 last_io.len);
32 memset(&last_io, 0, sizeof(last_io));
33 }
34
__file_type(struct inode * inode,pid_t pid)35 static int __file_type(struct inode *inode, pid_t pid)
36 {
37 if (f2fs_is_atomic_file(inode))
38 return __ATOMIC_FILE;
39 else if (f2fs_is_volatile_file(inode))
40 return __VOLATILE_FILE;
41 else if (S_ISDIR(inode->i_mode))
42 return __DIR_FILE;
43 else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode)))
44 return __NODE_FILE;
45 else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode)))
46 return __META_FILE;
47 else if (pid)
48 return __NORMAL_FILE;
49 else
50 return __MISC_FILE;
51 }
52
f2fs_trace_pid(struct page * page)53 void f2fs_trace_pid(struct page *page)
54 {
55 struct inode *inode = page->mapping->host;
56 pid_t pid = task_pid_nr(current);
57 void *p;
58
59 set_page_private(page, (unsigned long)pid);
60
61 retry:
62 if (radix_tree_preload(GFP_NOFS))
63 return;
64
65 spin_lock(&pids_lock);
66 p = radix_tree_lookup(&pids, pid);
67 if (p == current)
68 goto out;
69 if (p)
70 radix_tree_delete(&pids, pid);
71
72 if (radix_tree_insert(&pids, pid, current)) {
73 spin_unlock(&pids_lock);
74 radix_tree_preload_end();
75 cond_resched();
76 goto retry;
77 }
78
79 trace_printk("%3x:%3x %4x %-16s\n",
80 MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
81 pid, current->comm);
82 out:
83 spin_unlock(&pids_lock);
84 radix_tree_preload_end();
85 }
86
f2fs_trace_ios(struct f2fs_io_info * fio,int flush)87 void f2fs_trace_ios(struct f2fs_io_info *fio, int flush)
88 {
89 struct inode *inode;
90 pid_t pid;
91 int major, minor;
92
93 if (flush) {
94 __print_last_io();
95 return;
96 }
97
98 inode = fio->page->mapping->host;
99 pid = page_private(fio->page);
100
101 major = MAJOR(inode->i_sb->s_dev);
102 minor = MINOR(inode->i_sb->s_dev);
103
104 if (last_io.major == major && last_io.minor == minor &&
105 last_io.pid == pid &&
106 last_io.type == __file_type(inode, pid) &&
107 last_io.fio.op == fio->op &&
108 last_io.fio.op_flags == fio->op_flags &&
109 last_io.fio.new_blkaddr + last_io.len ==
110 fio->new_blkaddr) {
111 last_io.len++;
112 return;
113 }
114
115 __print_last_io();
116
117 last_io.major = major;
118 last_io.minor = minor;
119 last_io.pid = pid;
120 last_io.type = __file_type(inode, pid);
121 last_io.fio = *fio;
122 last_io.len = 1;
123 return;
124 }
125
f2fs_build_trace_ios(void)126 void f2fs_build_trace_ios(void)
127 {
128 spin_lock_init(&pids_lock);
129 }
130
131 #define PIDVEC_SIZE 128
gang_lookup_pids(pid_t * results,unsigned long first_index,unsigned int max_items)132 static unsigned int gang_lookup_pids(pid_t *results, unsigned long first_index,
133 unsigned int max_items)
134 {
135 struct radix_tree_iter iter;
136 void **slot;
137 unsigned int ret = 0;
138
139 if (unlikely(!max_items))
140 return 0;
141
142 radix_tree_for_each_slot(slot, &pids, &iter, first_index) {
143 results[ret] = iter.index;
144 if (++ret == max_items)
145 break;
146 }
147 return ret;
148 }
149
f2fs_destroy_trace_ios(void)150 void f2fs_destroy_trace_ios(void)
151 {
152 pid_t pid[PIDVEC_SIZE];
153 pid_t next_pid = 0;
154 unsigned int found;
155
156 spin_lock(&pids_lock);
157 while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) {
158 unsigned idx;
159
160 next_pid = pid[found - 1] + 1;
161 for (idx = 0; idx < found; idx++)
162 radix_tree_delete(&pids, pid[idx]);
163 }
164 spin_unlock(&pids_lock);
165 }
166