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 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 struct fsnotify_group *group = f->private_data; 30 struct fsnotify_mark *mark; 31 32 fsnotify_group_lock(group); 33 list_for_each_entry(mark, &group->marks_list, g_list) { 34 show(m, mark); 35 if (seq_has_overflowed(m)) 36 break; 37 } 38 fsnotify_group_unlock(group); 39 } 40 41 #if defined(CONFIG_EXPORTFS) 42 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 f.handle.handle_bytes = sizeof(f.pad); 51 size = f.handle.handle_bytes >> 2; 52 53 ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, NULL); 54 if ((ret == FILEID_INVALID) || (ret < 0)) { 55 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); 56 return; 57 } 58 59 f.handle.handle_type = ret; 60 f.handle.handle_bytes = size * sizeof(u32); 61 62 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:", 63 f.handle.handle_bytes, f.handle.handle_type); 64 65 for (i = 0; i < f.handle.handle_bytes; i++) 66 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 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 if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE) 82 return; 83 84 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); 85 inode = igrab(fsnotify_conn_inode(mark->connector)); 86 if (inode) { 87 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ", 88 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, 89 inotify_mark_user_mask(mark)); 90 show_mark_fhandle(m, inode); 91 seq_putc(m, '\n'); 92 iput(inode); 93 } 94 } 95 96 void inotify_show_fdinfo(struct seq_file *m, struct file *f) 97 { 98 show_fdinfo(m, f, inotify_fdinfo); 99 } 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 */ 149