LXR linux/fs/notify/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
  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        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, NULL);
  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                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->ignored_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->ignored_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->ignored_mask);
 130        }
 131}
 132
 133void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
 134{
 135        struct fsnotify_group *group = f->private_data;
 136
 137        seq_printf(m, "fanotify flags:%x event-flags:%x\n",
 138                   group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
 139                   group->fanotify_data.f_flags);
 140
 141        show_fdinfo(m, f, fanotify_fdinfo);
 142}
 143
 144#endif /* CONFIG_FANOTIFY */
 145
 146#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
 147
 148#endif /* CONFIG_PROC_FS */
 149