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 "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	mutex_lock(&group->mark_mutex);
 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	mutex_unlock(&group->mark_mutex);
 39}
 40
 41#if defined(CONFIG_EXPORTFS)
 42static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 43{
 44	struct {
 45		struct file_handle handle;
 46		u8 pad[MAX_HANDLE_SZ];
 47	} f;
 48	int size, ret, i;
 49
 50	f.handle.handle_bytes = sizeof(f.pad);
 51	size = f.handle.handle_bytes >> 2;
 52
 53	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
 54	if ((ret == FILEID_INVALID) || (ret < 0)) {
 55		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
 56		return;
 57	}
 58
 59	f.handle.handle_type = ret;
 60	f.handle.handle_bytes = size * sizeof(u32);
 61
 62	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
 63		   f.handle.handle_bytes, f.handle.handle_type);
 64
 65	for (i = 0; i < f.handle.handle_bytes; i++)
 66		seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
 67}
 68#else
 69static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 70{
 71}
 72#endif
 73
 74#ifdef CONFIG_INOTIFY_USER
 75
 76static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 77{
 78	struct inotify_inode_mark *inode_mark;
 79	struct inode *inode;
 80
 81	if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
 82		return;
 83
 84	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
 85	inode = igrab(fsnotify_conn_inode(mark->connector));
 86	if (inode) {
 87		/*
 88		 * IN_ALL_EVENTS represents all of the mask bits
 89		 * that we expose to userspace.  There is at
 90		 * least one bit (FS_EVENT_ON_CHILD) which is
 91		 * used only internally to the kernel.
 92		 */
 93		u32 mask = mark->mask & IN_ALL_EVENTS;
 94		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
 95			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
 96			   mask, mark->ignored_mask);
 97		show_mark_fhandle(m, inode);
 98		seq_putc(m, '\n');
 99		iput(inode);
100	}
101}
102
103void inotify_show_fdinfo(struct seq_file *m, struct file *f)
104{
105	show_fdinfo(m, f, inotify_fdinfo);
106}
107
108#endif /* CONFIG_INOTIFY_USER */
109
110#ifdef CONFIG_FANOTIFY
111
112static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
113{
114	unsigned int mflags = 0;
115	struct inode *inode;
116
117	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
118		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
119
120	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
121		inode = igrab(fsnotify_conn_inode(mark->connector));
122		if (!inode)
123			return;
124		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
125			   inode->i_ino, inode->i_sb->s_dev,
126			   mflags, mark->mask, mark->ignored_mask);
127		show_mark_fhandle(m, inode);
128		seq_putc(m, '\n');
129		iput(inode);
130	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
131		struct mount *mnt = fsnotify_conn_mount(mark->connector);
132
133		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
134			   mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
135	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
136		struct super_block *sb = fsnotify_conn_sb(mark->connector);
137
138		seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
139			   sb->s_dev, mflags, mark->mask, mark->ignored_mask);
140	}
141}
142
143void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
144{
145	struct fsnotify_group *group = f->private_data;
146
147	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
148		   group->fanotify_data.flags, group->fanotify_data.f_flags);
149
150	show_fdinfo(m, f, fanotify_fdinfo);
151}
152
153#endif /* CONFIG_FANOTIFY */
154
155#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
156
157#endif /* CONFIG_PROC_FS */