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author | Tejun Heo <htejun@gmail.com> | 2007-06-13 18:45:15 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-11 23:09:04 (GMT) |
commit | 3e5190380ebef77f2b015c9e7a4ca225a3d75021 (patch) | |
tree | 08d17cd0562acf5101063e93c649f5f71f80b3b9 /fs/sysfs/file.c | |
parent | 0c096b507f15397da890051ee73de4266d3941fb (diff) | |
download | linux-fsl-qoriq-3e5190380ebef77f2b015c9e7a4ca225a3d75021.tar.xz |
sysfs: make sysfs_dirent->s_element a union
Make sd->s_element a union of sysfs_elem_{dir|symlink|attr|bin_attr}
and rename it to s_elem. This is to achieve...
* some level of type checking : changing symlink to point to
sysfs_dirent instead of kobject is much safer and less painful now.
* easier / standardized dereferencing
* allow sysfs_elem_* to contain more than one entry
Where possible, pointer is obtained by directly deferencing from sd
instead of going through other entities. This reduces dependencies to
dentry, inode and kobject. to_attr() and to_bin_attr() are unused now
and removed.
This is in preparation of object reference simplification.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/file.c')
-rw-r--r-- | fs/sysfs/file.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 8240b16..04f6b0e 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -88,7 +88,6 @@ remove_from_collection(struct sysfs_buffer *buffer, struct inode *node) static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer) { struct sysfs_dirent * sd = dentry->d_fsdata; - struct attribute * attr = to_attr(dentry); struct kobject * kobj = to_kobj(dentry->d_parent); struct sysfs_ops * ops = buffer->ops; int ret = 0; @@ -100,7 +99,7 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer return -ENOMEM; buffer->event = atomic_read(&sd->s_event); - count = ops->show(kobj,attr,buffer->page); + count = ops->show(kobj, sd->s_elem.attr.attr, buffer->page); BUG_ON(count > (ssize_t)PAGE_SIZE); if (count >= 0) { buffer->needs_read_fill = 0; @@ -199,11 +198,11 @@ fill_write_buffer(struct sysfs_buffer * buffer, const char __user * buf, size_t static int flush_write_buffer(struct dentry * dentry, struct sysfs_buffer * buffer, size_t count) { - struct attribute * attr = to_attr(dentry); + struct sysfs_dirent *attr_sd = dentry->d_fsdata; struct kobject * kobj = to_kobj(dentry->d_parent); struct sysfs_ops * ops = buffer->ops; - return ops->store(kobj,attr,buffer->page,count); + return ops->store(kobj, attr_sd->s_elem.attr.attr, buffer->page, count); } @@ -248,7 +247,8 @@ out: static int sysfs_open_file(struct inode *inode, struct file *file) { struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent); - struct attribute * attr = to_attr(file->f_path.dentry); + struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata; + struct attribute *attr = attr_sd->s_elem.attr.attr; struct sysfs_buffer_collection *set; struct sysfs_buffer * buffer; struct sysfs_ops * ops = NULL; @@ -341,15 +341,15 @@ static int sysfs_open_file(struct inode *inode, struct file *file) static int sysfs_release(struct inode * inode, struct file * filp) { struct kobject * kobj = to_kobj(filp->f_path.dentry->d_parent); - struct attribute * attr = to_attr(filp->f_path.dentry); - struct module * owner = attr->owner; + struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata; + struct attribute *attr = attr_sd->s_elem.attr.attr; struct sysfs_buffer * buffer = filp->private_data; if (buffer) remove_from_collection(buffer, inode); kobject_put(kobj); /* After this point, attr should not be accessed. */ - module_put(owner); + module_put(attr->owner); if (buffer) { if (buffer->page) @@ -454,11 +454,12 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type) goto out_unlock; } - sd = sysfs_new_dirent(attr->name, (void *)attr, mode, type); + sd = sysfs_new_dirent(attr->name, mode, type); if (!sd) { error = -ENOMEM; goto out_unlock; } + sd->s_elem.attr.attr = (void *)attr; sysfs_attach_dirent(sd, parent_sd, NULL); out_unlock: |