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 "fdinfo.h"
  18#include "fsnotify.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, NULL);
  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->type != FSNOTIFY_OBJ_TYPE_INODE)
  81                return;
  82
  83        inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
  84        inode = igrab(fsnotify_conn_inode(mark->connector));
  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->type == FSNOTIFY_OBJ_TYPE_INODE) {
 120                inode = igrab(fsnotify_conn_inode(mark->connector));
 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->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
 130                struct mount *mnt = fsnotify_conn_mount(mark->connector);
 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        } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
 135                struct super_block *sb = fsnotify_conn_sb(mark->connector);
 136
 137                seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
 138                           sb->s_dev, mflags, mark->mask, mark->ignored_mask);
 139        }
 140}
 141
 142void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
 143{
 144        struct fsnotify_group *group = f->private_data;
 145
 146        seq_printf(m, "fanotify flags:%x event-flags:%x\n",
 147                   group->fanotify_data.flags & FANOTIFY_INIT_FLAGS,
 148                   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