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 spin_lock(&group->mark_lock); 31 list_for_each_entry(mark, &group->marks_list, g_list) { 32 ret = show(m, mark); 33 if (ret) 34 break; 35 } 36 spin_unlock(&group->mark_lock); 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 */ 180