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->flags & FSNOTIFY_MARK_FLAG_ALIVE) || 80 !(mark->flags & FSNOTIFY_MARK_FLAG_INODE)) 81 return; 82 83 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); 84 inode = igrab(mark->inode); 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 } 101 102 void 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 110 111 static 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_ALIVE)) 117 return; 118 119 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY) 120 mflags |= FAN_MARK_IGNORED_SURV_MODIFY; 121 122 if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) { 123 inode = igrab(mark->inode); 124 if (!inode) 125 return; 126 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ", 127 inode->i_ino, inode->i_sb->s_dev, 128 mflags, mark->mask, mark->ignored_mask); 129 show_mark_fhandle(m, inode); 130 seq_putc(m, '\n'); 131 iput(inode); 132 } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) { 133 struct mount *mnt = real_mount(mark->mnt); 134 135 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", 136 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask); 137 } 138 } 139 140 void fanotify_show_fdinfo(struct seq_file *m, struct file *f) 141 { 142 struct fsnotify_group *group = f->private_data; 143 unsigned int flags = 0; 144 145 switch (group->priority) { 146 case FS_PRIO_0: 147 flags |= FAN_CLASS_NOTIF; 148 break; 149 case FS_PRIO_1: 150 flags |= FAN_CLASS_CONTENT; 151 break; 152 case FS_PRIO_2: 153 flags |= FAN_CLASS_PRE_CONTENT; 154 break; 155 } 156 157 if (group->max_events == UINT_MAX) 158 flags |= FAN_UNLIMITED_QUEUE; 159 160 if (group->fanotify_data.max_marks == UINT_MAX) 161 flags |= FAN_UNLIMITED_MARKS; 162 163 seq_printf(m, "fanotify flags:%x event-flags:%x\n", 164 flags, group->fanotify_data.f_flags); 165 166 show_fdinfo(m, f, fanotify_fdinfo); 167 } 168 169 #endif /* CONFIG_FANOTIFY */ 170 171 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ 172 173 #endif /* CONFIG_PROC_FS */ 174