Move mnt_want_write() out of the vfs helper and up into
the ioctl handler.
Taking mnt_want_write() outside the vfs helper is the standard
in most namei.c syscalls.
This change will allow overlayfs code to use the helper for
copy up.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/ioctl.c | 9 +++++++++
fs/read_write.c | 5 -----
2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 34d2994..9299832 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -15,6 +15,7 @@
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <linux/falloc.h>
+#include <linux/mount.h>
#include "internal.h"
#include <asm/ioctls.h>
@@ -225,7 +226,15 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
return -EBADF;
if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
return -EXDEV;
+
+ ret = mnt_want_write_file(dst_file);
+ if (ret)
+ goto out_fput;
+
ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
+
+ mnt_drop_write_file(dst_file);
+out_fput:
fdput(src_file);
return ret;
}
diff --git a/fs/read_write.c b/fs/read_write.c
index 9dc6e52..90bc18b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1660,10 +1660,6 @@ int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
if (pos_in + len > i_size_read(inode_in))
return -EINVAL;
- ret = mnt_want_write_file(file_out);
- if (ret)
- return ret;
-
ret = file_in->f_op->clone_file_range(file_in, pos_in,
file_out, pos_out, len);
if (!ret) {
@@ -1671,7 +1667,6 @@ int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
fsnotify_modify(file_out);
}
- mnt_drop_write_file(file_out);
return ret;
}
EXPORT_SYMBOL(vfs_clone_file_range);
--
2.7.4
--
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