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-rw-r--r--fs/kernfs/file.c78
1 files changed, 28 insertions, 50 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 180906c36f..f0cb729e9a 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -429,60 +429,11 @@ static int kernfs_vma_access(struct vm_area_struct *vma, unsigned long addr,
return ret;
}
-#ifdef CONFIG_NUMA
-static int kernfs_vma_set_policy(struct vm_area_struct *vma,
- struct mempolicy *new)
-{
- struct file *file = vma->vm_file;
- struct kernfs_open_file *of = kernfs_of(file);
- int ret;
-
- if (!of->vm_ops)
- return 0;
-
- if (!kernfs_get_active(of->kn))
- return -EINVAL;
-
- ret = 0;
- if (of->vm_ops->set_policy)
- ret = of->vm_ops->set_policy(vma, new);
-
- kernfs_put_active(of->kn);
- return ret;
-}
-
-static struct mempolicy *kernfs_vma_get_policy(struct vm_area_struct *vma,
- unsigned long addr)
-{
- struct file *file = vma->vm_file;
- struct kernfs_open_file *of = kernfs_of(file);
- struct mempolicy *pol;
-
- if (!of->vm_ops)
- return vma->vm_policy;
-
- if (!kernfs_get_active(of->kn))
- return vma->vm_policy;
-
- pol = vma->vm_policy;
- if (of->vm_ops->get_policy)
- pol = of->vm_ops->get_policy(vma, addr);
-
- kernfs_put_active(of->kn);
- return pol;
-}
-
-#endif
-
static const struct vm_operations_struct kernfs_vm_ops = {
.open = kernfs_vma_open,
.fault = kernfs_vma_fault,
.page_mkwrite = kernfs_vma_page_mkwrite,
.access = kernfs_vma_access,
-#ifdef CONFIG_NUMA
- .set_policy = kernfs_vma_set_policy,
- .get_policy = kernfs_vma_get_policy,
-#endif
};
static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
@@ -903,6 +854,33 @@ static __poll_t kernfs_fop_poll(struct file *filp, poll_table *wait)
return ret;
}
+static loff_t kernfs_fop_llseek(struct file *file, loff_t offset, int whence)
+{
+ struct kernfs_open_file *of = kernfs_of(file);
+ const struct kernfs_ops *ops;
+ loff_t ret;
+
+ /*
+ * @of->mutex nests outside active ref and is primarily to ensure that
+ * the ops aren't called concurrently for the same open file.
+ */
+ mutex_lock(&of->mutex);
+ if (!kernfs_get_active(of->kn)) {
+ mutex_unlock(&of->mutex);
+ return -ENODEV;
+ }
+
+ ops = kernfs_ops(of->kn);
+ if (ops->llseek)
+ ret = ops->llseek(of, offset, whence);
+ else
+ ret = generic_file_llseek(file, offset, whence);
+
+ kernfs_put_active(of->kn);
+ mutex_unlock(&of->mutex);
+ return ret;
+}
+
static void kernfs_notify_workfn(struct work_struct *work)
{
struct kernfs_node *kn;
@@ -1005,7 +983,7 @@ EXPORT_SYMBOL_GPL(kernfs_notify);
const struct file_operations kernfs_file_fops = {
.read_iter = kernfs_fop_read_iter,
.write_iter = kernfs_fop_write_iter,
- .llseek = generic_file_llseek,
+ .llseek = kernfs_fop_llseek,
.mmap = kernfs_fop_mmap,
.open = kernfs_fop_open,
.release = kernfs_fop_release,