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| author | Amir Goldstein <amir73il@gmail.com> | 2023-10-13 12:49:37 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-12-23 16:35:09 +0200 |
| commit | f567377e406c032fff0799bde4fdf4a977529b84 (patch) | |
| tree | d5da6a53b7bb039eaaf9e75720a24f4b0a955602 /fs/overlayfs | |
| parent | 9b7e9e2f5d5c3d079ec46bc71b114012e362ea6e (diff) | |
fs: factor out backing_file_mmap() helper
Assert that the file object is allocated in a backing_file container
so that file_user_path() could be used to display the user path and
not the backing file's path in /proc/<pid>/maps.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/file.c | 23 |
1 files changed, 6 insertions, 17 deletions
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c index 69b52d2f9c74..05536964d37f 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -10,7 +10,6 @@ #include <linux/uio.h> #include <linux/uaccess.h> #include <linux/security.h> -#include <linux/mm.h> #include <linux/fs.h> #include <linux/backing-file.h> #include "overlayfs.h" @@ -415,23 +414,13 @@ static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync) static int ovl_mmap(struct file *file, struct vm_area_struct *vma) { struct file *realfile = file->private_data; - const struct cred *old_cred; - int ret; - - if (!realfile->f_op->mmap) - return -ENODEV; - - if (WARN_ON(file != vma->vm_file)) - return -EIO; - - vma_set_file(vma, realfile); - - old_cred = ovl_override_creds(file_inode(file)->i_sb); - ret = call_mmap(vma->vm_file, vma); - revert_creds(old_cred); - ovl_file_accessed(file); + struct backing_file_ctx ctx = { + .cred = ovl_creds(file_inode(file)->i_sb), + .user_file = file, + .accessed = ovl_file_accessed, + }; - return ret; + return backing_file_mmap(realfile, vma, &ctx); } static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |