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Diffstat (limited to 'fs/sysfs/bin.c')
-rw-r--r--fs/sysfs/bin.c68
1 files changed, 34 insertions, 34 deletions
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 4e321f7353f..a4759833d62 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -179,30 +179,14 @@ static void bin_vma_open(struct vm_area_struct *vma)
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(attr_sd))
- return;
-
- bb->vm_ops->open(vma);
-
- sysfs_put_active(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)
+ if (!bb->vm_ops)
return;
if (!sysfs_get_active(attr_sd))
return;
- bb->vm_ops->close(vma);
+ if (bb->vm_ops->open)
+ bb->vm_ops->open(vma);
sysfs_put_active(attr_sd);
}
@@ -214,13 +198,15 @@ static int bin_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
int ret;
- if (!bb->vm_ops || !bb->vm_ops->fault)
+ if (!bb->vm_ops)
return VM_FAULT_SIGBUS;
if (!sysfs_get_active(attr_sd))
return VM_FAULT_SIGBUS;
- ret = bb->vm_ops->fault(vma, vmf);
+ ret = VM_FAULT_SIGBUS;
+ if (bb->vm_ops->fault)
+ ret = bb->vm_ops->fault(vma, vmf);
sysfs_put_active(attr_sd);
return ret;
@@ -236,13 +222,12 @@ static int bin_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
if (!bb->vm_ops)
return VM_FAULT_SIGBUS;
- if (!bb->vm_ops->page_mkwrite)
- return 0;
-
if (!sysfs_get_active(attr_sd))
return VM_FAULT_SIGBUS;
- ret = bb->vm_ops->page_mkwrite(vma, vmf);
+ ret = 0;
+ if (bb->vm_ops->page_mkwrite)
+ ret = bb->vm_ops->page_mkwrite(vma, vmf);
sysfs_put_active(attr_sd);
return ret;
@@ -256,13 +241,15 @@ static int bin_access(struct vm_area_struct *vma, unsigned long addr,
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
int ret;
- if (!bb->vm_ops || !bb->vm_ops->access)
+ if (!bb->vm_ops)
return -EINVAL;
if (!sysfs_get_active(attr_sd))
return -EINVAL;
- ret = bb->vm_ops->access(vma, addr, buf, len, write);
+ ret = -EINVAL;
+ if (bb->vm_ops->access)
+ ret = bb->vm_ops->access(vma, addr, buf, len, write);
sysfs_put_active(attr_sd);
return ret;
@@ -276,13 +263,15 @@ static int bin_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
int ret;
- if (!bb->vm_ops || !bb->vm_ops->set_policy)
+ if (!bb->vm_ops)
return 0;
if (!sysfs_get_active(attr_sd))
return -EINVAL;
- ret = bb->vm_ops->set_policy(vma, new);
+ ret = 0;
+ if (bb->vm_ops->set_policy)
+ ret = bb->vm_ops->set_policy(vma, new);
sysfs_put_active(attr_sd);
return ret;
@@ -296,13 +285,15 @@ static struct mempolicy *bin_get_policy(struct vm_area_struct *vma,
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct mempolicy *pol;
- if (!bb->vm_ops || !bb->vm_ops->get_policy)
+ if (!bb->vm_ops)
return vma->vm_policy;
if (!sysfs_get_active(attr_sd))
return vma->vm_policy;
- pol = bb->vm_ops->get_policy(vma, addr);
+ pol = vma->vm_policy;
+ if (bb->vm_ops->get_policy)
+ pol = bb->vm_ops->get_policy(vma, addr);
sysfs_put_active(attr_sd);
return pol;
@@ -316,13 +307,15 @@ static int bin_migrate(struct vm_area_struct *vma, const nodemask_t *from,
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
int ret;
- if (!bb->vm_ops || !bb->vm_ops->migrate)
+ if (!bb->vm_ops)
return 0;
if (!sysfs_get_active(attr_sd))
return 0;
- ret = bb->vm_ops->migrate(vma, from, to, flags);
+ ret = 0;
+ if (bb->vm_ops->migrate)
+ ret = bb->vm_ops->migrate(vma, from, to, flags);
sysfs_put_active(attr_sd);
return ret;
@@ -331,7 +324,6 @@ static int bin_migrate(struct vm_area_struct *vma, const nodemask_t *from,
static const 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,
@@ -377,6 +369,14 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
if (bb->mmapped && bb->vm_ops != vma->vm_ops)
goto out_put;
+ /*
+ * It is not possible to successfully wrap close.
+ * So error if someone is trying to use close.
+ */
+ rc = -EINVAL;
+ if (vma->vm_ops && vma->vm_ops->close)
+ goto out_put;
+
rc = 0;
bb->mmapped = 1;
bb->vm_ops = vma->vm_ops;