Line data    Source code

       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             : 
      25           0 : static void show_fdinfo(struct seq_file *m, struct file *f,
      26             :                         void (*show)(struct seq_file *m,
      27             :                                      struct fsnotify_mark *mark))
      28             : {
      29           0 :         struct fsnotify_group *group = f->private_data;
      30             :         struct fsnotify_mark *mark;
      31             : 
      32           0 :         fsnotify_group_lock(group);
      33           0 :         list_for_each_entry(mark, &group->marks_list, g_list) {
      34           0 :                 show(m, mark);
      35           0 :                 if (seq_has_overflowed(m))
      36             :                         break;
      37             :         }
      38           0 :         fsnotify_group_unlock(group);
      39           0 : }
      40             : 
      41             : #if defined(CONFIG_EXPORTFS)
      42           0 : static 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           0 :         f.handle.handle_bytes = sizeof(f.pad);
      51           0 :         size = f.handle.handle_bytes >> 2;
      52             : 
      53           0 :         ret = exportfs_encode_fid(inode, (struct fid *)f.handle.f_handle, &size);
      54           0 :         if ((ret == FILEID_INVALID) || (ret < 0)) {
      55           0 :                 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
      56           0 :                 return;
      57             :         }
      58             : 
      59           0 :         f.handle.handle_type = ret;
      60           0 :         f.handle.handle_bytes = size * sizeof(u32);
      61             : 
      62           0 :         seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
      63             :                    f.handle.handle_bytes, f.handle.handle_type);
      64             : 
      65           0 :         for (i = 0; i < f.handle.handle_bytes; i++)
      66           0 :                 seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
      67             : }
      68             : #else
      69             : static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
      70             : {
      71             : }
      72             : #endif
      73             : 
      74             : #ifdef CONFIG_INOTIFY_USER
      75             : 
      76           0 : static 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           0 :         if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
      82             :                 return;
      83             : 
      84           0 :         inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
      85           0 :         inode = igrab(fsnotify_conn_inode(mark->connector));
      86           0 :         if (inode) {
      87           0 :                 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
      88           0 :                            inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
      89             :                            inotify_mark_user_mask(mark));
      90           0 :                 show_mark_fhandle(m, inode);
      91           0 :                 seq_putc(m, '\n');
      92           0 :                 iput(inode);
      93             :         }
      94             : }
      95             : 
      96           0 : void inotify_show_fdinfo(struct seq_file *m, struct file *f)
      97             : {
      98           0 :         show_fdinfo(m, f, inotify_fdinfo);
      99           0 : }
     100             : 
     101             : #endif /* CONFIG_INOTIFY_USER */
     102             : 
     103             : #ifdef CONFIG_FANOTIFY
     104             : 
     105             : static 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             :         }
     131             : }
     132             : 
     133             : void 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 */