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-rw-r--r--fs/sysfs/bin.c184
-rw-r--r--fs/sysfs/dir.c1
-rw-r--r--fs/sysfs/sysfs.h2
3 files changed, 174 insertions, 13 deletions
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index f2c478c3424..96cc2bf6a84 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -21,15 +21,28 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mutex.h>
+#include <linux/mm.h>
#include <asm/uaccess.h>
#include "sysfs.h"
+/*
+ * There's one bin_buffer for each open file.
+ *
+ * filp->private_data points to bin_buffer and
+ * sysfs_dirent->s_bin_attr.buffers points to a the bin_buffer s
+ * sysfs_dirent->s_bin_attr.buffers is protected by sysfs_bin_lock
+ */
+static DEFINE_MUTEX(sysfs_bin_lock);
+
struct bin_buffer {
- struct mutex mutex;
- void *buffer;
- int mmapped;
+ struct mutex mutex;
+ void *buffer;
+ int mmapped;
+ struct vm_operations_struct *vm_ops;
+ struct file *file;
+ struct hlist_node list;
};
static int
@@ -168,29 +181,148 @@ out_free:
return count;
}
+static void bin_vma_open(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+
+ if (!bb->vm_ops || !bb->vm_ops->open)
+ return;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return;
+
+ bb->vm_ops->open(vma);
+
+ sysfs_put_active_two(attr_sd);
+}
+
+static void bin_vma_close(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+
+ if (!bb->vm_ops || !bb->vm_ops->close)
+ return;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return;
+
+ bb->vm_ops->close(vma);
+
+ sysfs_put_active_two(attr_sd);
+}
+
+static int bin_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->fault)
+ return VM_FAULT_SIGBUS;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return VM_FAULT_SIGBUS;
+
+ ret = bb->vm_ops->fault(vma, vmf);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static int bin_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->page_mkwrite)
+ return -EINVAL;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return -EINVAL;
+
+ ret = bb->vm_ops->page_mkwrite(vma, page);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static int bin_access(struct vm_area_struct *vma, unsigned long addr,
+ void *buf, int len, int write)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->access)
+ return -EINVAL;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return -EINVAL;
+
+ ret = bb->vm_ops->access(vma, addr, buf, len, write);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static struct vm_operations_struct bin_vm_ops = {
+ .open = bin_vma_open,
+ .close = bin_vma_close,
+ .fault = bin_fault,
+ .page_mkwrite = bin_page_mkwrite,
+ .access = bin_access,
+};
+
static int mmap(struct file *file, struct vm_area_struct *vma)
{
struct bin_buffer *bb = file->private_data;
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
+ struct vm_operations_struct *vm_ops;
int rc;
mutex_lock(&bb->mutex);
/* need attr_sd for attr, its parent for kobj */
+ rc = -ENODEV;
if (!sysfs_get_active_two(attr_sd))
- return -ENODEV;
+ goto out_unlock;
rc = -EINVAL;
- if (attr->mmap)
- rc = attr->mmap(kobj, attr, vma);
+ if (!attr->mmap)
+ goto out_put;
- if (rc == 0 && !bb->mmapped)
- bb->mmapped = 1;
- else
- sysfs_put_active_two(attr_sd);
+ rc = attr->mmap(kobj, attr, vma);
+ vm_ops = vma->vm_ops;
+ vma->vm_ops = &bin_vm_ops;
+ if (rc)
+ goto out_put;
+ rc = -EINVAL;
+ if (bb->mmapped && bb->vm_ops != vma->vm_ops)
+ goto out_put;
+
+#ifdef CONFIG_NUMA
+ rc = -EINVAL;
+ if (vm_ops && ((vm_ops->set_policy || vm_ops->get_policy || vm_ops->migrate)))
+ goto out_put;
+#endif
+
+ rc = 0;
+ bb->mmapped = 1;
+ bb->vm_ops = vm_ops;
+out_put:
+ sysfs_put_active_two(attr_sd);
+out_unlock:
mutex_unlock(&bb->mutex);
return rc;
@@ -223,8 +355,13 @@ static int open(struct inode * inode, struct file * file)
goto err_out;
mutex_init(&bb->mutex);
+ bb->file = file;
file->private_data = bb;
+ mutex_lock(&sysfs_bin_lock);
+ hlist_add_head(&bb->list, &attr_sd->s_bin_attr.buffers);
+ mutex_unlock(&sysfs_bin_lock);
+
/* open succeeded, put active references */
sysfs_put_active_two(attr_sd);
return 0;
@@ -237,11 +374,12 @@ static int open(struct inode * inode, struct file * file)
static int release(struct inode * inode, struct file * file)
{
- struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct bin_buffer *bb = file->private_data;
- if (bb->mmapped)
- sysfs_put_active_two(attr_sd);
+ mutex_lock(&sysfs_bin_lock);
+ hlist_del(&bb->list);
+ mutex_unlock(&sysfs_bin_lock);
+
kfree(bb->buffer);
kfree(bb);
return 0;
@@ -256,6 +394,26 @@ const struct file_operations bin_fops = {
.release = release,
};
+
+void unmap_bin_file(struct sysfs_dirent *attr_sd)
+{
+ struct bin_buffer *bb;
+ struct hlist_node *tmp;
+
+ if (sysfs_type(attr_sd) != SYSFS_KOBJ_BIN_ATTR)
+ return;
+
+ mutex_lock(&sysfs_bin_lock);
+
+ hlist_for_each_entry(bb, tmp, &attr_sd->s_bin_attr.buffers, list) {
+ struct inode *inode = bb->file->f_path.dentry->d_inode;
+
+ unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+ }
+
+ mutex_unlock(&sysfs_bin_lock);
+}
+
/**
* sysfs_create_bin_file - create binary file for object.
* @kobj: object.
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index f13d852ab3c..66aeb4fff0c 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -609,6 +609,7 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
sysfs_drop_dentry(sd);
sysfs_deactivate(sd);
+ unmap_bin_file(sd);
sysfs_put(sd);
}
}
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 9055d04e4ab..3fa0d98481e 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -28,6 +28,7 @@ struct sysfs_elem_attr {
struct sysfs_elem_bin_attr {
struct bin_attribute *bin_attr;
+ struct hlist_head buffers;
};
/*
@@ -164,6 +165,7 @@ int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
* bin.c
*/
extern const struct file_operations bin_fops;
+void unmap_bin_file(struct sysfs_dirent *attr_sd);
/*
* symlink.c
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 12:43:14 +0000