diff options
| author | Andrei Vagin <avagin@google.com> | 2023-12-13 22:44:38 -0800 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-12-21 13:17:54 +0100 |
| commit | 3efdc78fdc21ab82694707eb234ab93f28d13ba8 (patch) | |
| tree | c8d8474c4044416931c05db19283882fe6544e9c /fs/proc | |
| parent | 434225230081b2b3435703decfa9c4214aac22ce (diff) | |
| download | lwn-3efdc78fdc21ab82694707eb234ab93f28d13ba8.tar.gz lwn-3efdc78fdc21ab82694707eb234ab93f28d13ba8.zip | |
fs/proc: show correct device and inode numbers in /proc/pid/maps
/proc/pid/maps shows device and inode numbers of vma->vm_file-s. Here is
an issue. If a mapped file is on a stackable file system (e.g.,
overlayfs), vma->vm_file is a backing file whose f_inode is on the
underlying filesystem. To show correct numbers, we need to get a user
file and shows its numbers. The same trick is used to show file paths in
/proc/pid/maps.
Cc: Alexander Mikhalitsyn <alexander@mihalicyn.com>
Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Andrei Vagin <avagin@google.com>
Link: https://lore.kernel.org/r/20231214064439.1023011-1-avagin@google.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/task_mmu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ef2eb12906da..5de0f70e52ff 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -273,7 +273,8 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma) const char *name = NULL; if (file) { - struct inode *inode = file_inode(vma->vm_file); + const struct inode *inode = file_user_inode(vma->vm_file); + dev = inode->i_sb->s_dev; ino = inode->i_ino; pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |