diff options
| author | Tejun Heo <tj@kernel.org> | 2013-10-01 21:42:00 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-06 00:21:03 (GMT) |
| commit | bcafe4eea3e58a60e9c2c63781700a9ab1d70f93 (patch) | |
| tree | 88026a22d2892e755551343f7245c804935d7f3f /fs/sysfs | |
| parent | 58282d8dc2e7cf2b87c8fee94d7138ed08e0a2e5 (diff) | |
| download | linux-bcafe4eea3e58a60e9c2c63781700a9ab1d70f93.tar.xz | |
sysfs: add sysfs_open_file->sd and ->file
sysfs will be converted to use seq_file for read path, which will make
it difficult to pass around multiple pointers directly. This patch
adds sysfs_open_file->sd and ->file so that we can reach all the
necessary data structures from sysfs_open_file.
flush_write_buffer() is updated to drop @dentry which was used to
discover the sysfs_dirent as it's now available through
sysfs_open_file->sd.
This patch doesn't cause any behavior difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/file.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 4b55bcf..af6e909 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -45,6 +45,8 @@ struct sysfs_open_dirent { }; struct sysfs_open_file { + struct sysfs_dirent *sd; + struct file *file; size_t count; char *page; struct mutex mutex; @@ -192,7 +194,6 @@ static int fill_write_buffer(struct sysfs_open_file *of, /** * flush_write_buffer - push buffer to kobject. - * @dentry: dentry to the attribute * @of: open file * @count: number of bytes * @@ -200,22 +201,20 @@ static int fill_write_buffer(struct sysfs_open_file *of, * dealing with, then call the store() method for the attribute, * passing the buffer that we acquired in fill_write_buffer(). */ -static int flush_write_buffer(struct dentry *dentry, - struct sysfs_open_file *of, size_t count) +static int flush_write_buffer(struct sysfs_open_file *of, size_t count) { - struct sysfs_dirent *attr_sd = dentry->d_fsdata; - struct kobject *kobj = attr_sd->s_parent->s_dir.kobj; + struct kobject *kobj = of->sd->s_parent->s_dir.kobj; const struct sysfs_ops *ops; int rc; - /* need attr_sd for attr and ops, its parent for kobj */ - if (!sysfs_get_active(attr_sd)) + /* need @of->sd for attr and ops, its parent for kobj */ + if (!sysfs_get_active(of->sd)) return -ENODEV; - ops = sysfs_file_ops(attr_sd); - rc = ops->store(kobj, attr_sd->s_attr.attr, of->page, count); + ops = sysfs_file_ops(of->sd); + rc = ops->store(kobj, of->sd->s_attr.attr, of->page, count); - sysfs_put_active(attr_sd); + sysfs_put_active(of->sd); return rc; } @@ -245,7 +244,7 @@ static ssize_t sysfs_write_file(struct file *file, const char __user *buf, mutex_lock(&of->mutex); len = fill_write_buffer(of, buf, count); if (len > 0) - len = flush_write_buffer(file->f_path.dentry, of, len); + len = flush_write_buffer(of, len); if (len > 0) *ppos += len; mutex_unlock(&of->mutex); @@ -385,6 +384,8 @@ static int sysfs_open_file(struct inode *inode, struct file *file) goto err_out; mutex_init(&of->mutex); + of->sd = attr_sd; + of->file = file; file->private_data = of; /* make sure we have open dirent struct */ |