2 * linux/fs/proc/proc_misc.c
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
8 * This used to be the part of array.c. See the rest of history and credits
9 * there. I took this into a separate file and switched the thing to generic
10 * proc_file_inode_operations, leaving in array.c only per-process stuff.
11 * Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/kernel_stat.h>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/quicklist.h>
28 #include <linux/proc_fs.h>
29 #include <linux/ioport.h>
31 #include <linux/mmzone.h>
32 #include <linux/pagemap.h>
33 #include <linux/irq.h>
34 #include <linux/interrupt.h>
35 #include <linux/swap.h>
36 #include <linux/slab.h>
37 #include <linux/genhd.h>
38 #include <linux/smp.h>
39 #include <linux/signal.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/seq_file.h>
43 #include <linux/times.h>
44 #include <linux/profile.h>
45 #include <linux/utsname.h>
46 #include <linux/blkdev.h>
47 #include <linux/hugetlb.h>
48 #include <linux/jiffies.h>
49 #include <linux/vmalloc.h>
50 #include <linux/crash_dump.h>
51 #include <linux/pid_namespace.h>
52 #include <linux/bootmem.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
57 #include <asm/div64.h>
60 static int fragmentation_open(struct inode *inode, struct file *file)
63 return seq_open(file, &fragmentation_op);
66 static const struct file_operations fragmentation_file_operations = {
67 .open = fragmentation_open,
70 .release = seq_release,
73 static int pagetypeinfo_open(struct inode *inode, struct file *file)
75 return seq_open(file, &pagetypeinfo_op);
78 static const struct file_operations pagetypeinfo_file_ops = {
79 .open = pagetypeinfo_open,
82 .release = seq_release,
85 static int zoneinfo_open(struct inode *inode, struct file *file)
87 return seq_open(file, &zoneinfo_op);
90 static const struct file_operations proc_zoneinfo_file_operations = {
91 .open = zoneinfo_open,
94 .release = seq_release,
97 static int vmstat_open(struct inode *inode, struct file *file)
99 return seq_open(file, &vmstat_op);
101 static const struct file_operations proc_vmstat_file_operations = {
105 .release = seq_release,
109 static int diskstats_open(struct inode *inode, struct file *file)
111 return seq_open(file, &diskstats_op);
113 static const struct file_operations proc_diskstats_operations = {
114 .open = diskstats_open,
117 .release = seq_release,
121 #ifdef CONFIG_MODULES
122 extern const struct seq_operations modules_op;
123 static int modules_open(struct inode *inode, struct file *file)
125 return seq_open(file, &modules_op);
127 static const struct file_operations proc_modules_operations = {
128 .open = modules_open,
131 .release = seq_release,
135 #ifdef CONFIG_SLABINFO
136 static int slabinfo_open(struct inode *inode, struct file *file)
138 return seq_open(file, &slabinfo_op);
140 static const struct file_operations proc_slabinfo_operations = {
141 .open = slabinfo_open,
143 .write = slabinfo_write,
145 .release = seq_release,
148 #ifdef CONFIG_DEBUG_SLAB_LEAK
149 extern const struct seq_operations slabstats_op;
150 static int slabstats_open(struct inode *inode, struct file *file)
152 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
155 ret = seq_open(file, &slabstats_op);
157 struct seq_file *m = file->private_data;
158 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
167 static const struct file_operations proc_slabstats_operations = {
168 .open = slabstats_open,
171 .release = seq_release_private,
177 static int vmalloc_open(struct inode *inode, struct file *file)
179 unsigned int *ptr = NULL;
183 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
184 ret = seq_open(file, &vmalloc_op);
186 struct seq_file *m = file->private_data;
193 static const struct file_operations proc_vmalloc_operations = {
194 .open = vmalloc_open,
197 .release = seq_release_private,
201 #ifdef CONFIG_PROC_PAGE_MONITOR
202 #define KPMSIZE sizeof(u64)
203 #define KPMMASK (KPMSIZE - 1)
204 /* /proc/kpagecount - an array exposing page counts
206 * Each entry is a u64 representing the corresponding
207 * physical page count.
209 static ssize_t kpagecount_read(struct file *file, char __user *buf,
210 size_t count, loff_t *ppos)
212 u64 __user *out = (u64 __user *)buf;
214 unsigned long src = *ppos;
220 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
221 if (src & KPMMASK || count & KPMMASK)
227 ppage = pfn_to_page(pfn);
232 pcount = page_mapcount(ppage);
234 if (put_user(pcount, out++)) {
242 *ppos += (char __user *)out - buf;
244 ret = (char __user *)out - buf;
248 static struct file_operations proc_kpagecount_operations = {
250 .read = kpagecount_read,
253 /* /proc/kpageflags - an array exposing page flags
255 * Each entry is a u64 representing the corresponding
256 * physical page flags.
259 /* These macros are used to decouple internal flags from exported ones */
263 #define KPF_REFERENCED 2
264 #define KPF_UPTODATE 3
269 #define KPF_WRITEBACK 8
270 #define KPF_RECLAIM 9
273 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
275 static ssize_t kpageflags_read(struct file *file, char __user *buf,
276 size_t count, loff_t *ppos)
278 u64 __user *out = (u64 __user *)buf;
280 unsigned long src = *ppos;
286 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
287 if (src & KPMMASK || count & KPMMASK)
293 ppage = pfn_to_page(pfn);
298 kflags = ppage->flags;
300 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
301 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
302 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
303 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
304 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
305 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
306 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
307 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
308 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
309 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
310 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
312 if (put_user(uflags, out++)) {
320 *ppos += (char __user *)out - buf;
322 ret = (char __user *)out - buf;
326 static struct file_operations proc_kpageflags_operations = {
328 .read = kpageflags_read,
330 #endif /* CONFIG_PROC_PAGE_MONITOR */
332 struct proc_dir_entry *proc_root_kcore;
334 void __init proc_misc_init(void)
336 proc_symlink("mounts", NULL, "self/mounts");
338 /* And now for trickier ones */
339 #ifdef CONFIG_SLABINFO
340 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
341 #ifdef CONFIG_DEBUG_SLAB_LEAK
342 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
346 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
348 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
349 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
350 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
351 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
353 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
355 #ifdef CONFIG_MODULES
356 proc_create("modules", 0, NULL, &proc_modules_operations);
358 #ifdef CONFIG_SCHEDSTATS
359 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
361 #ifdef CONFIG_PROC_KCORE
362 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
364 proc_root_kcore->size =
365 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
367 #ifdef CONFIG_PROC_PAGE_MONITOR
368 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
369 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
371 #ifdef CONFIG_PROC_VMCORE
372 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);