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sysfs: merge sysfs_elem_bin_attr into sysfs_elem_attr

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3124eb1679 ("sysfs: merge regular and bin file handling") folded bin
file handling into regular file handling.  Among other things, bin
file now shares the same open path including sysfs_open_dirent
association using sysfs_dirent->s_attr.open.  This is buggy because
->s_bin_attr lives in the same union and doesn't have the field.  This
bug doesn't trigger because sysfs_elem_bin_attr doesn't have an active
field at the conflicting position.  It does have a field "buffers" but
it isn't used anymore.

This patch collapses sysfs_elem_bin_attr into sysfs_elem_attr so that
the bin_attr is accessed through ->s_attr.bin_attr which lives with
->s_attr.attr in an anonymous union.  The code paths already assume
bin_attr contains attr as the first element, so this doesn't add any
more assumptions while making it explicit that the two types are
handled together.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-10-24 11:49:07 -04:00 committed by Greg Kroah-Hartman
parent 6fffcfa7c0
commit 56b3f3b884
3 changed files with 9 additions and 12 deletions
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8
fs/sysfs/file.c
View file

@ -154,7 +154,7 @@ static ssize_t sysfs_bin_read(struct file *file, char __user *userbuf,
size_t bytes, loff_t *off)
{
struct sysfs_open_file *of = sysfs_of(file);
struct bin_attribute *battr = of->sd->s_bin_attr.bin_attr;
struct bin_attribute *battr = of->sd->s_attr.bin_attr;
struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
loff_t size = file_inode(file)->i_size;
int count = min_t(size_t, bytes, PAGE_SIZE);
@ -236,7 +236,7 @@ static int flush_write_buffer(struct sysfs_open_file *of, char *buf, loff_t off,
}
if (sysfs_is_bin(of->sd)) {
struct bin_attribute *battr = of->sd->s_bin_attr.bin_attr;
struct bin_attribute *battr = of->sd->s_attr.bin_attr;
rc = -EIO;
if (battr->write)
@ -466,7 +466,7 @@ static const struct vm_operations_struct sysfs_bin_vm_ops = {
static int sysfs_bin_mmap(struct file *file, struct vm_area_struct *vma)
{
struct sysfs_open_file *of = sysfs_of(file);
struct bin_attribute *battr = of->sd->s_bin_attr.bin_attr;
struct bin_attribute *battr = of->sd->s_attr.bin_attr;
struct kobject *kobj = of->sd->s_parent->s_dir.kobj;
int rc;
@ -618,7 +618,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
return -ENODEV;
if (sysfs_is_bin(attr_sd)) {
struct bin_attribute *battr = attr_sd->s_bin_attr.bin_attr;
struct bin_attribute *battr = attr_sd->s_attr.bin_attr;
has_read = battr->read || battr->mmap;
has_write = battr->write || battr->mmap;

2
fs/sysfs/inode.c
View file

@ -258,7 +258,7 @@ static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
inode->i_fop = &sysfs_file_operations;
break;
case SYSFS_KOBJ_BIN_ATTR:
bin_attr = sd->s_bin_attr.bin_attr;
bin_attr = sd->s_attr.bin_attr;
inode->i_size = bin_attr->size;
inode->i_fop = &sysfs_bin_operations;
break;

11
fs/sysfs/sysfs.h
View file

@ -29,15 +29,13 @@ struct sysfs_elem_symlink {
};
struct sysfs_elem_attr {
struct attribute *attr;
union {
struct attribute *attr;
struct bin_attribute *bin_attr;
};
struct sysfs_open_dirent *open;
};
struct sysfs_elem_bin_attr {
struct bin_attribute *bin_attr;
struct hlist_head buffers;
};
struct sysfs_inode_attrs {
struct iattr ia_iattr;
void *ia_secdata;
@ -74,7 +72,6 @@ struct sysfs_dirent {
struct sysfs_elem_dir s_dir;
struct sysfs_elem_symlink s_symlink;
struct sysfs_elem_attr s_attr;
struct sysfs_elem_bin_attr s_bin_attr;
};
unsigned short s_flags;