fs/notify/fdinfo.c

   1 #include <linux/file.h>
   2 #include <linux/fs.h>
   3 #include <linux/fsnotify_backend.h>
   4 #include <linux/idr.h>
   5 #include <linux/init.h>
   6 #include <linux/inotify.h>
   7 #include <linux/fanotify.h>
   8 #include <linux/kernel.h>
   9 #include <linux/namei.h>
  10 #include <linux/sched.h>
  11 #include <linux/types.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/exportfs.h>
  15
  16 #include "inotify/inotify.h"
  17 #include "../fs/mount.h"
  18
  19 #if defined(CONFIG_PROC_FS)
  20
  21 #if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
  22
  23 static int show_fdinfo(struct seq_file *m, struct file *f,
  24                        int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
  25 {
  26         struct fsnotify_group *group = f->private_data;
  27         struct fsnotify_mark *mark;
  28         int ret = 0;
  29
  30         mutex_lock(&group->mark_mutex);
  31         list_for_each_entry(mark, &group->marks_list, g_list) {
  32                 ret = show(m, mark);
  33                 if (ret)
  34                         break;
  35         }
  36         mutex_unlock(&group->mark_mutex);
  37         return ret;
  38 }
  39
  40 #if defined(CONFIG_EXPORTFS)
  41 static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
  42 {
  43         struct {
  44                 struct file_handle handle;
  45                 u8 pad[64];
  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, 0);
  53         if ((ret == 255) || (ret == -ENOSPC)) {
  54                 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
  55                 return 0;
  56         }
  57
  58         f.handle.handle_type = ret;
  59         f.handle.handle_bytes = size * sizeof(u32);
  60
  61         ret = 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                 ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
  66
  67         return ret;
  68 }
  69 #else
  70 static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
  71 {
  72         return 0;
  73 }
  74 #endif
  75
  76 #ifdef CONFIG_INOTIFY_USER
  77
  78 static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
  79 {
  80         struct inotify_inode_mark *inode_mark;
  81         struct inode *inode;
  82         int ret = 0;
  83
  84         if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
  85                 return 0;
  86
  87         inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
  88         inode = igrab(mark->i.inode);
  89         if (inode) {
  90                 ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
  91                                  "mask:%x ignored_mask:%x ",
  92                                  inode_mark->wd, inode->i_ino,
  93                                  inode->i_sb->s_dev,
  94                                  mark->mask, mark->ignored_mask);
  95                 ret |= show_mark_fhandle(m, inode);
  96                 ret |= seq_putc(m, '\n');
  97                 iput(inode);
  98         }
  99
 100         return ret;
 101 }
 102
 103 int inotify_show_fdinfo(struct seq_file *m, struct file *f)
 104 {
 105         return show_fdinfo(m, f, inotify_fdinfo);
 106 }
 107
 108 #endif /* CONFIG_INOTIFY_USER */
 109
 110 #ifdef CONFIG_FANOTIFY
 111
 112 static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 113 {
 114         unsigned int mflags = 0;
 115         struct inode *inode;
 116         int ret = 0;
 117
 118         if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
 119                 return 0;
 120
 121         if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
 122                 mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
 123
 124         if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
 125                 inode = igrab(mark->i.inode);
 126                 if (!inode)
 127                         goto out;
 128                 ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
 129                                  "mflags:%x mask:%x ignored_mask:%x ",
 130                                  inode->i_ino, inode->i_sb->s_dev,
 131                                  mflags, mark->mask, mark->ignored_mask);
 132                 ret |= show_mark_fhandle(m, inode);
 133                 ret |= seq_putc(m, '\n');
 134                 iput(inode);
 135         } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
 136                 struct mount *mnt = real_mount(mark->m.mnt);
 137
 138                 ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x "
 139                                  "ignored_mask:%x\n", mnt->mnt_id, mflags,
 140                                  mark->mask, mark->ignored_mask);
 141         }
 142 out:
 143         return ret;
 144 }
 145
 146 int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
 147 {
 148         struct fsnotify_group *group = f->private_data;
 149         unsigned int flags = 0;
 150
 151         switch (group->priority) {
 152         case FS_PRIO_0:
 153                 flags |= FAN_CLASS_NOTIF;
 154                 break;
 155         case FS_PRIO_1:
 156                 flags |= FAN_CLASS_CONTENT;
 157                 break;
 158         case FS_PRIO_2:
 159                 flags |= FAN_CLASS_PRE_CONTENT;
 160                 break;
 161         }
 162
 163         if (group->max_events == UINT_MAX)
 164                 flags |= FAN_UNLIMITED_QUEUE;
 165
 166         if (group->fanotify_data.max_marks == UINT_MAX)
 167                 flags |= FAN_UNLIMITED_MARKS;
 168
 169         seq_printf(m, "fanotify flags:%x event-flags:%x\n",
 170                    flags, group->fanotify_data.f_flags);
 171
 172         return show_fdinfo(m, f, fanotify_fdinfo);
 173 }
 174
 175 #endif /* CONFIG_FANOTIFY */
 176
 177 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
 178
 179 #endif /* CONFIG_PROC_FS */