1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/file.h>
  3#include <linux/fs.h>
  4#include <linux/fsnotify_backend.h>
  5#include <linux/idr.h>
  6#include <linux/init.h>
  7#include <linux/inotify.h>
  8#include <linux/fanotify.h>
  9#include <linux/kernel.h>
 10#include <linux/namei.h>
 11#include <linux/sched.h>
 12#include <linux/types.h>
 13#include <linux/seq_file.h>
 14#include <linux/exportfs.h>
 15
 16#include "inotify/inotify.h"
 17#include "fanotify/fanotify.h"
 18#include "fdinfo.h"
 19#include "fsnotify.h"
 20
 21#if defined(CONFIG_PROC_FS)
 22
 23#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
 24
 25static void show_fdinfo(struct seq_file *m, struct file *f,
 26			void (*show)(struct seq_file *m,
 27				     struct fsnotify_mark *mark))
 28{
 29	struct fsnotify_group *group = f->private_data;
 30	struct fsnotify_mark *mark;
 31
 32	fsnotify_group_lock(group);
 33	list_for_each_entry(mark, &group->marks_list, g_list) {
 34		show(m, mark);
 35		if (seq_has_overflowed(m))
 36			break;
 37	}
 38	fsnotify_group_unlock(group);
 39}
 40
 41#if defined(CONFIG_EXPORTFS)
 42static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 43{
 44	DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ);
 45	int size, ret, i;
 46
 47	size = f->handle_bytes >> 2;
 48
 49	ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size);
 50	if ((ret == FILEID_INVALID) || (ret < 0))
 51		return;
 52
 53	f->handle_type = ret;
 54	f->handle_bytes = size * sizeof(u32);
 55
 56	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
 57		   f->handle_bytes, f->handle_type);
 58
 59	for (i = 0; i < f->handle_bytes; i++)
 60		seq_printf(m, "%02x", (int)f->f_handle[i]);
 61}
 62#else
 63static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 64{
 65}
 66#endif
 67
 68#ifdef CONFIG_INOTIFY_USER
 69
 70static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 71{
 72	struct inotify_inode_mark *inode_mark;
 73	struct inode *inode;
 74
 75	if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
 76		return;
 77
 78	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
 79	inode = igrab(fsnotify_conn_inode(mark->connector));
 80	if (inode) {
 81		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
 82			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
 83			   inotify_mark_user_mask(mark));
 84		show_mark_fhandle(m, inode);
 85		seq_putc(m, '\n');
 86		iput(inode);
 87	}
 88}
 89
 90void inotify_show_fdinfo(struct seq_file *m, struct file *f)
 91{
 92	show_fdinfo(m, f, inotify_fdinfo);
 93}
 94
 95#endif /* CONFIG_INOTIFY_USER */
 96
 97#ifdef CONFIG_FANOTIFY
 98
 99static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
100{
101	unsigned int mflags = fanotify_mark_user_flags(mark);
102	struct inode *inode;
103
104	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
105		inode = igrab(fsnotify_conn_inode(mark->connector));
106		if (!inode)
107			return;
108		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
109			   inode->i_ino, inode->i_sb->s_dev,
110			   mflags, mark->mask, mark->ignore_mask);
111		show_mark_fhandle(m, inode);
112		seq_putc(m, '\n');
113		iput(inode);
114	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
115		struct mount *mnt = fsnotify_conn_mount(mark->connector);
116
117		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
118			   mnt->mnt_id, mflags, mark->mask, mark->ignore_mask);
119	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
120		struct super_block *sb = fsnotify_conn_sb(mark->connector);
121
122		seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
123			   sb->s_dev, mflags, mark->mask, mark->ignore_mask);
124	}
125}
126
127void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
128{
129	struct fsnotify_group *group = f->private_data;
130
131	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
132		   group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
133		   group->fanotify_data.f_flags);
134
135	show_fdinfo(m, f, fanotify_fdinfo);
136}
137
138#endif /* CONFIG_FANOTIFY */
139
140#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
141
142#endif /* CONFIG_PROC_FS */