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/proc_fs.h>
 15#include <linux/exportfs.h>
 16
 17#include "inotify/inotify.h"
 18#include "../fs/mount.h"
 19
 20#if defined(CONFIG_PROC_FS)
 21
 22#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
 23
 24static void show_fdinfo(struct seq_file *m, struct file *f,
 25			void (*show)(struct seq_file *m,
 26				     struct fsnotify_mark *mark))
 27{
 28	struct fsnotify_group *group = f->private_data;
 29	struct fsnotify_mark *mark;
 30
 31	mutex_lock(&group->mark_mutex);
 32	list_for_each_entry(mark, &group->marks_list, g_list) {
 33		show(m, mark);
 34		if (seq_has_overflowed(m))
 35			break;
 36	}
 37	mutex_unlock(&group->mark_mutex);
 38}
 39
 40#if defined(CONFIG_EXPORTFS)
 41static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 42{
 43	struct {
 44		struct file_handle handle;
 45		u8 pad[MAX_HANDLE_SZ];
 46	} f;
 47	int size, ret, i;
 48
 49	f.handle.handle_bytes = sizeof(f.pad);
 50	size = f.handle.handle_bytes >> 2;
 51
 52	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
 53	if ((ret == FILEID_INVALID) || (ret < 0)) {
 54		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
 55		return;
 56	}
 57
 58	f.handle.handle_type = ret;
 59	f.handle.handle_bytes = size * sizeof(u32);
 60
 61	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
 62		   f.handle.handle_bytes, f.handle.handle_type);
 63
 64	for (i = 0; i < f.handle.handle_bytes; i++)
 65		seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
 66}
 67#else
 68static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 69{
 70}
 71#endif
 72
 73#ifdef CONFIG_INOTIFY_USER
 74
 75static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 76{
 77	struct inotify_inode_mark *inode_mark;
 78	struct inode *inode;
 79
 80	if (!(mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE))
 81		return;
 82
 83	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
 84	inode = igrab(mark->connector->inode);
 85	if (inode) {
 86		/*
 87		 * IN_ALL_EVENTS represents all of the mask bits
 88		 * that we expose to userspace.  There is at
 89		 * least one bit (FS_EVENT_ON_CHILD) which is
 90		 * used only internally to the kernel.
 91		 */
 92		u32 mask = mark->mask & IN_ALL_EVENTS;
 93		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
 94			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
 95			   mask, mark->ignored_mask);
 96		show_mark_fhandle(m, inode);
 97		seq_putc(m, '\n');
 98		iput(inode);
 99	}
100}
101
102void inotify_show_fdinfo(struct seq_file *m, struct file *f)
103{
104	show_fdinfo(m, f, inotify_fdinfo);
105}
106
107#endif /* CONFIG_INOTIFY_USER */
108
109#ifdef CONFIG_FANOTIFY
110
111static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
112{
113	unsigned int mflags = 0;
114	struct inode *inode;
115
116	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
117		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
118
119	if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
120		inode = igrab(mark->connector->inode);
121		if (!inode)
122			return;
123		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
124			   inode->i_ino, inode->i_sb->s_dev,
125			   mflags, mark->mask, mark->ignored_mask);
126		show_mark_fhandle(m, inode);
127		seq_putc(m, '\n');
128		iput(inode);
129	} else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
130		struct mount *mnt = real_mount(mark->connector->mnt);
131
132		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
133			   mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
134	}
135}
136
137void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
138{
139	struct fsnotify_group *group = f->private_data;
140	unsigned int flags = 0;
141
142	switch (group->priority) {
143	case FS_PRIO_0:
144		flags |= FAN_CLASS_NOTIF;
145		break;
146	case FS_PRIO_1:
147		flags |= FAN_CLASS_CONTENT;
148		break;
149	case FS_PRIO_2:
150		flags |= FAN_CLASS_PRE_CONTENT;
151		break;
152	}
153
154	if (group->max_events == UINT_MAX)
155		flags |= FAN_UNLIMITED_QUEUE;
156
157	if (group->fanotify_data.max_marks == UINT_MAX)
158		flags |= FAN_UNLIMITED_MARKS;
159
160	if (group->fanotify_data.audit)
161		flags |= FAN_ENABLE_AUDIT;
162
163	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
164		   flags, group->fanotify_data.f_flags);
165
166	show_fdinfo(m, f, fanotify_fdinfo);
167}
168
169#endif /* CONFIG_FANOTIFY */
170
171#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
172
173#endif /* CONFIG_PROC_FS */