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authorNicolai Stange <nicstange@gmail.com>2016-03-22 14:11:18 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-12 14:14:21 -0700
commit4d45f7974ccf0aa783034fef2661573b3a28609e (patch)
tree302b046fc51e7215d5eca256385dfc2d7e98852f /fs/debugfs
parent4909f168104b24f592fb8d502e2a6520346a3927 (diff)
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debugfs: unproxify files created through debugfs_create_bool()
Currently, the struct file_operations fops_bool associated with files created through the debugfs_create_bool() helpers are not file lifetime aware. Thus, a lifetime managing proxy is created around fops_bool each time such a file is opened which is an unnecessary waste of resources. Implement file lifetime management for the fops_bool file_operations. Namely, make debugfs_read_file_bool() and debugfs_write_file_bool() safe against file removals by means of debugfs_use_file_start() and debugfs_use_file_finish(). Make debugfs_create_bool() create its files in non-proxying operation mode through debugfs_create_mode_unsafe(). Finally, purge debugfs_create_mode() as debugfs_create_bool() had been its last user. Signed-off-by: Nicolai Stange <nicstange@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs')
-rw-r--r--fs/debugfs/file.c41
1 files changed, 20 insertions, 21 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 4b3967e86e97..8a548bee1b3d 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -312,22 +312,6 @@ ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
}
EXPORT_SYMBOL_GPL(debugfs_attr_write);
-static struct dentry *debugfs_create_mode(const char *name, umode_t mode,
- struct dentry *parent, void *value,
- const struct file_operations *fops,
- const struct file_operations *fops_ro,
- const struct file_operations *fops_wo)
-{
- /* if there are no write bits set, make read only */
- if (!(mode & S_IWUGO))
- return debugfs_create_file(name, mode, parent, value, fops_ro);
- /* if there are no read bits set, make write only */
- if (!(mode & S_IRUGO))
- return debugfs_create_file(name, mode, parent, value, fops_wo);
-
- return debugfs_create_file(name, mode, parent, value, fops);
-}
-
static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode,
struct dentry *parent, void *value,
const struct file_operations *fops,
@@ -756,9 +740,17 @@ ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
char buf[3];
- bool *val = file->private_data;
+ bool val;
+ int r, srcu_idx;
+
+ r = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
+ if (likely(!r))
+ val = *(bool *)file->private_data;
+ debugfs_use_file_finish(srcu_idx);
+ if (r)
+ return r;
- if (*val)
+ if (val)
buf[0] = 'Y';
else
buf[0] = 'N';
@@ -774,6 +766,7 @@ ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
char buf[32];
size_t buf_size;
bool bv;
+ int r, srcu_idx;
bool *val = file->private_data;
buf_size = min(count, (sizeof(buf)-1));
@@ -781,8 +774,14 @@ ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
return -EFAULT;
buf[buf_size] = '\0';
- if (strtobool(buf, &bv) == 0)
- *val = bv;
+ if (strtobool(buf, &bv) == 0) {
+ r = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
+ if (likely(!r))
+ *val = bv;
+ debugfs_use_file_finish(srcu_idx);
+ if (r)
+ return r;
+ }
return count;
}
@@ -834,7 +833,7 @@ static const struct file_operations fops_bool_wo = {
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
struct dentry *parent, bool *value)
{
- return debugfs_create_mode(name, mode, parent, value, &fops_bool,
+ return debugfs_create_mode_unsafe(name, mode, parent, value, &fops_bool,
&fops_bool_ro, &fops_bool_wo);
}
EXPORT_SYMBOL_GPL(debugfs_create_bool);