Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * @file oprofilefs.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * @remark Copyright 2002 OProfile authors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * @remark Read the file COPYING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * @author John Levon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * A simple filesystem for configuration and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * access of oprofile.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/oprofile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "oprof.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define OPROFILEFS_MAGIC 0x6f70726f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) DEFINE_RAW_SPINLOCK(oprofilefs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static struct inode *oprofilefs_get_inode(struct super_block *sb, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct inode *inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		inode->i_ino = get_next_ino();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		inode->i_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static const struct super_operations s_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	.statfs		= simple_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	.drop_inode 	= generic_delete_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) ssize_t oprofilefs_str_to_user(char const *str, char __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	return simple_read_from_buffer(buf, count, offset, str, strlen(str));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define TMPBUFSIZE 50
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	char tmpbuf[TMPBUFSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	size_t maxlen = snprintf(tmpbuf, TMPBUFSIZE, "%lu\n", val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (maxlen > TMPBUFSIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		maxlen = TMPBUFSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	return simple_read_from_buffer(buf, count, offset, tmpbuf, maxlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * Note: If oprofilefs_ulong_from_user() returns 0, then *val remains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * unchanged and might be uninitialized. This follows write syscall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * implementation when count is zero: "If count is zero ... [and if]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  * no errors are detected, 0 will be returned without causing any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  * other effect." (man 2 write)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) int oprofilefs_ulong_from_user(unsigned long *val, char const __user *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	char tmpbuf[TMPBUFSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (count > TMPBUFSIZE - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	memset(tmpbuf, 0x0, TMPBUFSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (copy_from_user(tmpbuf, buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	raw_spin_lock_irqsave(&oprofilefs_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	*val = simple_strtoul(tmpbuf, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	raw_spin_unlock_irqrestore(&oprofilefs_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static ssize_t ulong_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	unsigned long *val = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return oprofilefs_ulong_to_user(*val, buf, count, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static ssize_t ulong_write_file(struct file *file, char const __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	unsigned long value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (*offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	retval = oprofilefs_ulong_from_user(&value, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (retval <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	retval = oprofile_set_ulong(file->private_data, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static const struct file_operations ulong_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	.read		= ulong_read_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	.write		= ulong_write_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	.open		= simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	.llseek		= default_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static const struct file_operations ulong_ro_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	.read		= ulong_read_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	.open		= simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	.llseek		= default_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int __oprofilefs_create_file(struct dentry *root, char const *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	const struct file_operations *fops, int perm, void *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (!root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	inode_lock(d_inode(root));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	dentry = d_alloc_name(root, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (!dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		inode_unlock(d_inode(root));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	inode = oprofilefs_get_inode(root->d_sb, S_IFREG | perm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		inode_unlock(d_inode(root));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	inode->i_fop = fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	inode->i_private = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	d_add(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	inode_unlock(d_inode(root));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int oprofilefs_create_ulong(struct dentry *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	char const *name, unsigned long *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	return __oprofilefs_create_file(root, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 					&ulong_fops, 0644, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int oprofilefs_create_ro_ulong(struct dentry *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	char const *name, unsigned long *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	return __oprofilefs_create_file(root, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 					&ulong_ro_fops, 0444, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static ssize_t atomic_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	atomic_t *val = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	return oprofilefs_ulong_to_user(atomic_read(val), buf, count, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static const struct file_operations atomic_ro_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	.read		= atomic_read_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	.open		= simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	.llseek		= default_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) int oprofilefs_create_ro_atomic(struct dentry *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	char const *name, atomic_t *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	return __oprofilefs_create_file(root, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 					&atomic_ro_fops, 0444, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int oprofilefs_create_file(struct dentry *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	char const *name, const struct file_operations *fops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return __oprofilefs_create_file(root, name, fops, 0644, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) int oprofilefs_create_file_perm(struct dentry *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	char const *name, const struct file_operations *fops, int perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return __oprofilefs_create_file(root, name, fops, perm, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	inode_lock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	dentry = d_alloc_name(parent, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (!dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	inode = oprofilefs_get_inode(parent->d_sb, S_IFDIR | 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	inode->i_op = &simple_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	inode->i_fop = &simple_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	d_add(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	inode_unlock(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int oprofilefs_fill_super(struct super_block *sb, struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct inode *root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	sb->s_blocksize = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	sb->s_blocksize_bits = PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	sb->s_magic = OPROFILEFS_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	sb->s_op = &s_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	sb->s_time_gran = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	root_inode = oprofilefs_get_inode(sb, S_IFDIR | 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (!root_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	root_inode->i_op = &simple_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	root_inode->i_fop = &simple_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	sb->s_root = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (!sb->s_root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	oprofile_create_files(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	// FIXME: verify kill_litter_super removes our dentries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int oprofilefs_get_tree(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	return get_tree_single(fc, oprofilefs_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static const struct fs_context_operations oprofilefs_context_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	.get_tree	= oprofilefs_get_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static int oprofilefs_init_fs_context(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	fc->ops = &oprofilefs_context_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static struct file_system_type oprofilefs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	.name		= "oprofilefs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.init_fs_context = oprofilefs_init_fs_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	.kill_sb	= kill_litter_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) MODULE_ALIAS_FS("oprofilefs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) int __init oprofilefs_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return register_filesystem(&oprofilefs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) void __exit oprofilefs_unregister(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	unregister_filesystem(&oprofilefs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }