Blame view
drivers/oprofile/oprofilefs.c
6.64 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
/** * @file oprofilefs.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon * * A simple filesystem for configuration and * access of oprofile. */ #include <linux/init.h> #include <linux/module.h> #include <linux/oprofile.h> #include <linux/fs.h> |
c6a2c720d vfs: Convert opro... |
17 |
#include <linux/fs_context.h> |
1da177e4c Linux-2.6.12-rc2 |
18 |
#include <linux/pagemap.h> |
7c0f6ba68 Replace <asm/uacc... |
19 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
20 21 22 23 |
#include "oprof.h" #define OPROFILEFS_MAGIC 0x6f70726f |
2d21a29fb locking, oprofile... |
24 |
DEFINE_RAW_SPINLOCK(oprofilefs_lock); |
1da177e4c Linux-2.6.12-rc2 |
25 |
|
25ad2913c oprofile: more wh... |
26 |
static struct inode *oprofilefs_get_inode(struct super_block *sb, int mode) |
1da177e4c Linux-2.6.12-rc2 |
27 |
{ |
25ad2913c oprofile: more wh... |
28 |
struct inode *inode = new_inode(sb); |
1da177e4c Linux-2.6.12-rc2 |
29 30 |
if (inode) { |
85fe4025c fs: do not assign... |
31 |
inode->i_ino = get_next_ino(); |
1da177e4c Linux-2.6.12-rc2 |
32 |
inode->i_mode = mode; |
078cd8279 fs: Replace CURRE... |
33 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
34 35 36 |
} return inode; } |
b87221de6 const: mark remai... |
37 |
static const struct super_operations s_ops = { |
1da177e4c Linux-2.6.12-rc2 |
38 39 40 |
.statfs = simple_statfs, .drop_inode = generic_delete_inode, }; |
25ad2913c oprofile: more wh... |
41 |
ssize_t oprofilefs_str_to_user(char const *str, char __user *buf, size_t count, loff_t *offset) |
1da177e4c Linux-2.6.12-rc2 |
42 43 44 45 46 47 |
{ return simple_read_from_buffer(buf, count, offset, str, strlen(str)); } #define TMPBUFSIZE 50 |
25ad2913c oprofile: more wh... |
48 |
ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user *buf, size_t count, loff_t *offset) |
1da177e4c Linux-2.6.12-rc2 |
49 50 51 52 53 54 55 56 |
{ char tmpbuf[TMPBUFSIZE]; size_t maxlen = snprintf(tmpbuf, TMPBUFSIZE, "%lu ", val); if (maxlen > TMPBUFSIZE) maxlen = TMPBUFSIZE; return simple_read_from_buffer(buf, count, offset, tmpbuf, maxlen); } |
913050b91 oprofile: Fix uni... |
57 58 59 60 61 62 63 |
/* * Note: If oprofilefs_ulong_from_user() returns 0, then *val remains * unchanged and might be uninitialized. This follows write syscall * implementation when count is zero: "If count is zero ... [and if] * no errors are detected, 0 will be returned without causing any * other effect." (man 2 write) */ |
25ad2913c oprofile: more wh... |
64 |
int oprofilefs_ulong_from_user(unsigned long *val, char const __user *buf, size_t count) |
1da177e4c Linux-2.6.12-rc2 |
65 66 |
{ char tmpbuf[TMPBUFSIZE]; |
4dfc896e9 [PATCH] oprofile:... |
67 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
68 69 70 71 72 73 74 75 76 77 78 |
if (!count) return 0; if (count > TMPBUFSIZE - 1) return -EINVAL; memset(tmpbuf, 0x0, TMPBUFSIZE); if (copy_from_user(tmpbuf, buf, count)) return -EFAULT; |
2d21a29fb locking, oprofile... |
79 |
raw_spin_lock_irqsave(&oprofilefs_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
80 |
*val = simple_strtoul(tmpbuf, NULL, 0); |
2d21a29fb locking, oprofile... |
81 |
raw_spin_unlock_irqrestore(&oprofilefs_lock, flags); |
913050b91 oprofile: Fix uni... |
82 |
return count; |
1da177e4c Linux-2.6.12-rc2 |
83 |
} |
25ad2913c oprofile: more wh... |
84 |
static ssize_t ulong_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4c Linux-2.6.12-rc2 |
85 |
{ |
25ad2913c oprofile: more wh... |
86 |
unsigned long *val = file->private_data; |
1da177e4c Linux-2.6.12-rc2 |
87 88 |
return oprofilefs_ulong_to_user(*val, buf, count, offset); } |
25ad2913c oprofile: more wh... |
89 |
static ssize_t ulong_write_file(struct file *file, char const __user *buf, size_t count, loff_t *offset) |
1da177e4c Linux-2.6.12-rc2 |
90 |
{ |
7df01d96b oprofile: disable... |
91 |
unsigned long value; |
1da177e4c Linux-2.6.12-rc2 |
92 93 94 95 |
int retval; if (*offset) return -EINVAL; |
7df01d96b oprofile: disable... |
96 |
retval = oprofilefs_ulong_from_user(&value, buf, count); |
913050b91 oprofile: Fix uni... |
97 |
if (retval <= 0) |
7df01d96b oprofile: disable... |
98 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
99 |
|
7df01d96b oprofile: disable... |
100 |
retval = oprofile_set_ulong(file->private_data, value); |
1da177e4c Linux-2.6.12-rc2 |
101 102 |
if (retval) return retval; |
7df01d96b oprofile: disable... |
103 |
|
1da177e4c Linux-2.6.12-rc2 |
104 105 |
return count; } |
d54b1fdb1 [PATCH] mark stru... |
106 |
static const struct file_operations ulong_fops = { |
1da177e4c Linux-2.6.12-rc2 |
107 108 |
.read = ulong_read_file, .write = ulong_write_file, |
234e34058 simple_open: auto... |
109 |
.open = simple_open, |
6038f373a llseek: automatic... |
110 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
111 |
}; |
d54b1fdb1 [PATCH] mark stru... |
112 |
static const struct file_operations ulong_ro_fops = { |
1da177e4c Linux-2.6.12-rc2 |
113 |
.read = ulong_read_file, |
234e34058 simple_open: auto... |
114 |
.open = simple_open, |
6038f373a llseek: automatic... |
115 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
116 |
}; |
6af4ea0ba oprofilefs_create... |
117 118 |
static int __oprofilefs_create_file(struct dentry *root, char const *name, const struct file_operations *fops, int perm, void *priv) |
1da177e4c Linux-2.6.12-rc2 |
119 |
{ |
25ad2913c oprofile: more wh... |
120 121 |
struct dentry *dentry; struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
122 |
|
a74989683 oprofilefs: don't... |
123 124 |
if (!root) return -ENOMEM; |
5955102c9 wrappers for ->i_... |
125 |
inode_lock(d_inode(root)); |
1da177e4c Linux-2.6.12-rc2 |
126 |
dentry = d_alloc_name(root, name); |
3f3834c35 oprofilefs: add m... |
127 |
if (!dentry) { |
5955102c9 wrappers for ->i_... |
128 |
inode_unlock(d_inode(root)); |
4fdaa7b68 oprofile: Remove ... |
129 |
return -ENOMEM; |
3f3834c35 oprofilefs: add m... |
130 |
} |
6af4ea0ba oprofilefs_create... |
131 |
inode = oprofilefs_get_inode(root->d_sb, S_IFREG | perm); |
1da177e4c Linux-2.6.12-rc2 |
132 133 |
if (!inode) { dput(dentry); |
5955102c9 wrappers for ->i_... |
134 |
inode_unlock(d_inode(root)); |
4fdaa7b68 oprofile: Remove ... |
135 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
136 137 |
} inode->i_fop = fops; |
3f3834c35 oprofilefs: add m... |
138 |
inode->i_private = priv; |
1da177e4c Linux-2.6.12-rc2 |
139 |
d_add(dentry, inode); |
5955102c9 wrappers for ->i_... |
140 |
inode_unlock(d_inode(root)); |
4fdaa7b68 oprofile: Remove ... |
141 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
142 |
} |
6af4ea0ba oprofilefs_create... |
143 |
int oprofilefs_create_ulong(struct dentry *root, |
25ad2913c oprofile: more wh... |
144 |
char const *name, unsigned long *val) |
1da177e4c Linux-2.6.12-rc2 |
145 |
{ |
6af4ea0ba oprofilefs_create... |
146 |
return __oprofilefs_create_file(root, name, |
4fdaa7b68 oprofile: Remove ... |
147 |
&ulong_fops, 0644, val); |
1da177e4c Linux-2.6.12-rc2 |
148 |
} |
6af4ea0ba oprofilefs_create... |
149 |
int oprofilefs_create_ro_ulong(struct dentry *root, |
25ad2913c oprofile: more wh... |
150 |
char const *name, unsigned long *val) |
1da177e4c Linux-2.6.12-rc2 |
151 |
{ |
6af4ea0ba oprofilefs_create... |
152 |
return __oprofilefs_create_file(root, name, |
4fdaa7b68 oprofile: Remove ... |
153 |
&ulong_ro_fops, 0444, val); |
1da177e4c Linux-2.6.12-rc2 |
154 |
} |
25ad2913c oprofile: more wh... |
155 |
static ssize_t atomic_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset) |
1da177e4c Linux-2.6.12-rc2 |
156 |
{ |
25ad2913c oprofile: more wh... |
157 |
atomic_t *val = file->private_data; |
1da177e4c Linux-2.6.12-rc2 |
158 159 |
return oprofilefs_ulong_to_user(atomic_read(val), buf, count, offset); } |
6a18037d4 oprofile: fixing ... |
160 |
|
1da177e4c Linux-2.6.12-rc2 |
161 |
|
d54b1fdb1 [PATCH] mark stru... |
162 |
static const struct file_operations atomic_ro_fops = { |
1da177e4c Linux-2.6.12-rc2 |
163 |
.read = atomic_read_file, |
234e34058 simple_open: auto... |
164 |
.open = simple_open, |
6038f373a llseek: automatic... |
165 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
166 |
}; |
6a18037d4 oprofile: fixing ... |
167 |
|
1da177e4c Linux-2.6.12-rc2 |
168 |
|
6af4ea0ba oprofilefs_create... |
169 |
int oprofilefs_create_ro_atomic(struct dentry *root, |
25ad2913c oprofile: more wh... |
170 |
char const *name, atomic_t *val) |
1da177e4c Linux-2.6.12-rc2 |
171 |
{ |
6af4ea0ba oprofilefs_create... |
172 |
return __oprofilefs_create_file(root, name, |
4fdaa7b68 oprofile: Remove ... |
173 |
&atomic_ro_fops, 0444, val); |
1da177e4c Linux-2.6.12-rc2 |
174 |
} |
6a18037d4 oprofile: fixing ... |
175 |
|
6af4ea0ba oprofilefs_create... |
176 |
int oprofilefs_create_file(struct dentry *root, |
25ad2913c oprofile: more wh... |
177 |
char const *name, const struct file_operations *fops) |
1da177e4c Linux-2.6.12-rc2 |
178 |
{ |
6af4ea0ba oprofilefs_create... |
179 |
return __oprofilefs_create_file(root, name, fops, 0644, NULL); |
1da177e4c Linux-2.6.12-rc2 |
180 |
} |
6af4ea0ba oprofilefs_create... |
181 |
int oprofilefs_create_file_perm(struct dentry *root, |
25ad2913c oprofile: more wh... |
182 |
char const *name, const struct file_operations *fops, int perm) |
1da177e4c Linux-2.6.12-rc2 |
183 |
{ |
6af4ea0ba oprofilefs_create... |
184 |
return __oprofilefs_create_file(root, name, fops, perm, NULL); |
1da177e4c Linux-2.6.12-rc2 |
185 |
} |
ecde28237 oprofilefs_mkdir(... |
186 |
struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name) |
1da177e4c Linux-2.6.12-rc2 |
187 |
{ |
25ad2913c oprofile: more wh... |
188 189 |
struct dentry *dentry; struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
190 |
|
5955102c9 wrappers for ->i_... |
191 |
inode_lock(d_inode(parent)); |
ecde28237 oprofilefs_mkdir(... |
192 |
dentry = d_alloc_name(parent, name); |
3f3834c35 oprofilefs: add m... |
193 |
if (!dentry) { |
5955102c9 wrappers for ->i_... |
194 |
inode_unlock(d_inode(parent)); |
1da177e4c Linux-2.6.12-rc2 |
195 |
return NULL; |
3f3834c35 oprofilefs: add m... |
196 |
} |
ecde28237 oprofilefs_mkdir(... |
197 |
inode = oprofilefs_get_inode(parent->d_sb, S_IFDIR | 0755); |
1da177e4c Linux-2.6.12-rc2 |
198 199 |
if (!inode) { dput(dentry); |
5955102c9 wrappers for ->i_... |
200 |
inode_unlock(d_inode(parent)); |
1da177e4c Linux-2.6.12-rc2 |
201 202 203 204 205 |
return NULL; } inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; d_add(dentry, inode); |
5955102c9 wrappers for ->i_... |
206 |
inode_unlock(d_inode(parent)); |
1da177e4c Linux-2.6.12-rc2 |
207 208 |
return dentry; } |
c6a2c720d vfs: Convert opro... |
209 |
static int oprofilefs_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
210 |
{ |
25ad2913c oprofile: more wh... |
211 |
struct inode *root_inode; |
1da177e4c Linux-2.6.12-rc2 |
212 |
|
09cbfeaf1 mm, fs: get rid o... |
213 214 |
sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
215 216 217 218 219 220 221 222 223 |
sb->s_magic = OPROFILEFS_MAGIC; sb->s_op = &s_ops; sb->s_time_gran = 1; root_inode = oprofilefs_get_inode(sb, S_IFDIR | 0755); if (!root_inode) return -ENOMEM; root_inode->i_op = &simple_dir_inode_operations; root_inode->i_fop = &simple_dir_operations; |
318ceed08 tidy up after d_m... |
224 225 |
sb->s_root = d_make_root(root_inode); if (!sb->s_root) |
1da177e4c Linux-2.6.12-rc2 |
226 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
227 |
|
a9e599e55 don't bother pass... |
228 |
oprofile_create_files(sb->s_root); |
1da177e4c Linux-2.6.12-rc2 |
229 230 231 232 |
// FIXME: verify kill_litter_super removes our dentries return 0; } |
c6a2c720d vfs: Convert opro... |
233 |
static int oprofilefs_get_tree(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
234 |
{ |
c6a2c720d vfs: Convert opro... |
235 |
return get_tree_single(fc, oprofilefs_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
236 |
} |
c6a2c720d vfs: Convert opro... |
237 238 239 240 241 242 243 244 245 |
static const struct fs_context_operations oprofilefs_context_ops = { .get_tree = oprofilefs_get_tree, }; static int oprofilefs_init_fs_context(struct fs_context *fc) { fc->ops = &oprofilefs_context_ops; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
246 247 248 249 |
static struct file_system_type oprofilefs_type = { .owner = THIS_MODULE, .name = "oprofilefs", |
c6a2c720d vfs: Convert opro... |
250 |
.init_fs_context = oprofilefs_init_fs_context, |
1da177e4c Linux-2.6.12-rc2 |
251 252 |
.kill_sb = kill_litter_super, }; |
7f78e0351 fs: Limit sys_mou... |
253 |
MODULE_ALIAS_FS("oprofilefs"); |
1da177e4c Linux-2.6.12-rc2 |
254 255 256 257 258 259 260 261 262 263 264 265 |
int __init oprofilefs_register(void) { return register_filesystem(&oprofilefs_type); } void __exit oprofilefs_unregister(void) { unregister_filesystem(&oprofilefs_type); } |