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/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 */
 158