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 void show_fdinfo(struct seq_file *m, struct file *f, 24 void (*show)(struct seq_file *m, 25 struct fsnotify_mark *mark)) 26 { 27 struct fsnotify_group *group = f->private_data; 28 struct fsnotify_mark *mark; 29 30 mutex_lock(&group->mark_mutex); 31 list_for_each_entry(mark, &group->marks_list, g_list) { 32 show(m, mark); 33 if (seq_has_overflowed(m)) 34 break; 35 } 36 mutex_unlock(&group->mark_mutex); 37 } 38 39 #if defined(CONFIG_EXPORTFS) 40 static void show_mark_fhandle(struct seq_file *m, struct inode *inode) 41 { 42 struct { 43 struct file_handle handle; 44 u8 pad[MAX_HANDLE_SZ]; 45 } f; 46 int size, ret, i; 47 48 f.handle.handle_bytes = sizeof(f.pad); 49 size = f.handle.handle_bytes >> 2; 50 51 ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0); 52 if ((ret == FILEID_INVALID) || (ret < 0)) { 53 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); 54 return; 55 } 56 57 f.handle.handle_type = ret; 58 f.handle.handle_bytes = size * sizeof(u32); 59 60 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:", 61 f.handle.handle_bytes, f.handle.handle_type); 62 63 for (i = 0; i < f.handle.handle_bytes; i++) 64 seq_printf(m, "%02x", (int)f.handle.f_handle[i]); 65 } 66 #else 67 static void show_mark_fhandle(struct seq_file *m, struct inode *inode) 68 { 69 } 70 #endif 71 72 #ifdef CONFIG_INOTIFY_USER 73 74 static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 75 { 76 struct inotify_inode_mark *inode_mark; 77 struct inode *inode; 78 79 if (!(mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE)) 80 return; 81 82 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); 83 inode = igrab(mark->connector->inode); 84 if (inode) { 85 /* 86 * IN_ALL_EVENTS represents all of the mask bits 87 * that we expose to userspace. There is at 88 * least one bit (FS_EVENT_ON_CHILD) which is 89 * used only internally to the kernel. 90 */ 91 u32 mask = mark->mask & IN_ALL_EVENTS; 92 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ", 93 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, 94 mask, mark->ignored_mask); 95 show_mark_fhandle(m, inode); 96 seq_putc(m, '\n'); 97 iput(inode); 98 } 99 } 100 101 void inotify_show_fdinfo(struct seq_file *m, struct file *f) 102 { 103 show_fdinfo(m, f, inotify_fdinfo); 104 } 105 106 #endif /* CONFIG_INOTIFY_USER */ 107 108 #ifdef CONFIG_FANOTIFY 109 110 static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 111 { 112 unsigned int mflags = 0; 113 struct inode *inode; 114 115 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY) 116 mflags |= FAN_MARK_IGNORED_SURV_MODIFY; 117 118 if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) { 119 inode = igrab(mark->connector->inode); 120 if (!inode) 121 return; 122 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ", 123 inode->i_ino, inode->i_sb->s_dev, 124 mflags, mark->mask, mark->ignored_mask); 125 show_mark_fhandle(m, inode); 126 seq_putc(m, '\n'); 127 iput(inode); 128 } else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) { 129 struct mount *mnt = real_mount(mark->connector->mnt); 130 131 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", 132 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask); 133 } 134 } 135 136 void fanotify_show_fdinfo(struct seq_file *m, struct file *f) 137 { 138 struct fsnotify_group *group = f->private_data; 139 unsigned int flags = 0; 140 141 switch (group->priority) { 142 case FS_PRIO_0: 143 flags |= FAN_CLASS_NOTIF; 144 break; 145 case FS_PRIO_1: 146 flags |= FAN_CLASS_CONTENT; 147 break; 148 case FS_PRIO_2: 149 flags |= FAN_CLASS_PRE_CONTENT; 150 break; 151 } 152 153 if (group->max_events == UINT_MAX) 154 flags |= FAN_UNLIMITED_QUEUE; 155 156 if (group->fanotify_data.max_marks == UINT_MAX) 157 flags |= FAN_UNLIMITED_MARKS; 158 159 seq_printf(m, "fanotify flags:%x event-flags:%x\n", 160 flags, group->fanotify_data.f_flags); 161 162 show_fdinfo(m, f, fanotify_fdinfo); 163 } 164 165 #endif /* CONFIG_FANOTIFY */ 166 167 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ 168 169 #endif /* CONFIG_PROC_FS */ 170