/proc/locks does not always print the correct inode number/device pair.
Update lock_get_status() to use vfs_map_unique_ino_dev() to get the real,
unique values for userspace.
Signed-off-by: Mark Fasheh <mfasheh@xxxxxxx>
---
fs/locks.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index db7b6917d9c5..3a012df87fd8 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2621,6 +2621,7 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
loff_t id, char *pfx)
{
struct inode *inode = NULL;
+ struct dentry *dentry;
unsigned int fl_pid;
struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
@@ -2633,8 +2634,10 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
if (fl_pid == 0)
return;
- if (fl->fl_file != NULL)
+ if (fl->fl_file != NULL) {
inode = locks_inode(fl->fl_file);
+ dentry = file_dentry(fl->fl_file);
+ }
seq_printf(f, "%lld:%s ", id, pfx);
if (IS_POSIX(fl)) {
@@ -2681,10 +2684,13 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
: (fl->fl_type == F_WRLCK) ? "WRITE" : "READ ");
}
if (inode) {
+ __u64 ino;
+ dev_t dev;
+
+ vfs_map_unique_ino_dev(dentry, &ino, &dev);
/* userspace relies on this representation of dev_t */
seq_printf(f, "%d %02x:%02x:%ld ", fl_pid,
- MAJOR(inode->i_sb->s_dev),
- MINOR(inode->i_sb->s_dev), inode->i_ino);
+ MAJOR(dev), MINOR(dev), inode->i_ino);
} else {
seq_printf(f, "%d <none>:0 ", fl_pid);
}
--
2.15.1
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