fdinfo.c

  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#include "../internal.h"
 21
 22#if defined(CONFIG_PROC_FS)
 23
 24#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
 25
 26static void show_fdinfo(struct seq_file *m, struct file *f,
 27			void (*show)(struct seq_file *m,
 28				     struct fsnotify_mark *mark))
 29{
 30	struct fsnotify_group *group = f->private_data;
 31	struct fsnotify_mark *mark;
 32
 33	fsnotify_group_lock(group);
 34	list_for_each_entry(mark, &group->marks_list, g_list) {
 35		show(m, mark);
 36		if (seq_has_overflowed(m))
 37			break;
 38	}
 39	fsnotify_group_unlock(group);
 40}
 41
 42#if defined(CONFIG_EXPORTFS)
 43static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 44{
 45	DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ);
 46	int size, ret, i;
 47
 48	size = f->handle_bytes >> 2;
 49
 50	if (!super_trylock_shared(inode->i_sb))
 51		return;
 52
 53	ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size);
 54	up_read(&inode->i_sb->s_umount);
 55
 56	if ((ret == FILEID_INVALID) || (ret < 0))
 57		return;
 58
 59	f->handle_type = ret;
 60	f->handle_bytes = size * sizeof(u32);
 61
 62	seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
 63		   f->handle_bytes, f->handle_type);
 64
 65	for (i = 0; i < f->handle_bytes; i++)
 66		seq_printf(m, "%02x", (int)f->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		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
 88			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
 89			   inotify_mark_user_mask(mark));
 90		show_mark_fhandle(m, inode);
 91		seq_putc(m, '\n');
 92		iput(inode);
 93	}
 94}
 95
 96void inotify_show_fdinfo(struct seq_file *m, struct file *f)
 97{
 98	show_fdinfo(m, f, inotify_fdinfo);
 99}
100
101#endif /* CONFIG_INOTIFY_USER */
102
103#ifdef CONFIG_FANOTIFY
104
105static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
106{
107	unsigned int mflags = fanotify_mark_user_flags(mark);
108	struct inode *inode;
109
110	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
111		inode = igrab(fsnotify_conn_inode(mark->connector));
112		if (!inode)
113			return;
114		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
115			   inode->i_ino, inode->i_sb->s_dev,
116			   mflags, mark->mask, mark->ignore_mask);
117		show_mark_fhandle(m, inode);
118		seq_putc(m, '\n');
119		iput(inode);
120	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
121		struct mount *mnt = fsnotify_conn_mount(mark->connector);
122
123		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
124			   mnt->mnt_id, mflags, mark->mask, mark->ignore_mask);
125	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
126		struct super_block *sb = fsnotify_conn_sb(mark->connector);
127
128		seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
129			   sb->s_dev, mflags, mark->mask, mark->ignore_mask);
130	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_MNTNS) {
131		struct mnt_namespace *mnt_ns = fsnotify_conn_mntns(mark->connector);
132
133		seq_printf(m, "fanotify mnt_ns:%u mflags:%x mask:%x ignored_mask:%x\n",
134			   mnt_ns->ns.inum, mflags, mark->mask, mark->ignore_mask);
135	}
136}
137
138void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
139{
140	struct fsnotify_group *group = f->private_data;
141
142	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
143		   group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
144		   group->fanotify_data.f_flags);
145
146	show_fdinfo(m, f, fanotify_fdinfo);
147}
148
149#endif /* CONFIG_FANOTIFY */
150
151#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
152
153#endif /* CONFIG_PROC_FS */