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-rw-r--r--fs/read_write.c28
-rw-r--r--include/linux/fs.h1
2 files changed, 17 insertions, 12 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 69128b378646..9d7952a6829b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -527,6 +527,20 @@ ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, lo
EXPORT_SYMBOL(new_sync_write);
+ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
+ loff_t *pos)
+{
+ if (file->f_op->write)
+ return file->f_op->write(file, p, count, pos);
+ else if (file->f_op->aio_write)
+ return do_sync_write(file, p, count, pos);
+ else if (file->f_op->write_iter)
+ return new_sync_write(file, p, count, pos);
+ else
+ return -EINVAL;
+}
+EXPORT_SYMBOL(__vfs_write);
+
ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
@@ -541,12 +555,7 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
p = (__force const char __user *)buf;
if (count > MAX_RW_COUNT)
count = MAX_RW_COUNT;
- if (file->f_op->write)
- ret = file->f_op->write(file, p, count, pos);
- else if (file->f_op->aio_write)
- ret = do_sync_write(file, p, count, pos);
- else
- ret = new_sync_write(file, p, count, pos);
+ ret = __vfs_write(file, p, count, pos);
set_fs(old_fs);
if (ret > 0) {
fsnotify_modify(file);
@@ -573,12 +582,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
if (ret >= 0) {
count = ret;
file_start_write(file);
- if (file->f_op->write)
- ret = file->f_op->write(file, buf, count, pos);
- else if (file->f_op->aio_write)
- ret = do_sync_write(file, buf, count, pos);
- else
- ret = new_sync_write(file, buf, count, pos);
+ ret = __vfs_write(file, buf, count, pos);
if (ret > 0) {
fsnotify_modify(file);
add_wchar(current, ret);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 20fe15fe236d..4a1cb00bd805 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1639,6 +1639,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
struct iovec **ret_pointer);
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
+extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,