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 DEFINE_FLEX(struct file_handle, f, f_handle, handle_bytes, MAX_HANDLE_SZ); 45 int size, ret, i; 46 47 size = f->handle_bytes >> 2; 48 49 ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size); 50 if ((ret == FILEID_INVALID) || (ret < 0)) { 51 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); 52 return; 53 } 54 55 f->handle_type = ret; 56 f->handle_bytes = size * sizeof(u32); 57 58 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:", 59 f->handle_bytes, f->handle_type); 60 61 for (i = 0; i < f->handle_bytes; i++) 62 seq_printf(m, "%02x", (int)f->f_handle[i]); 63 } 64 #else 65 static void show_mark_fhandle(struct seq_file *m, struct inode *inode) 66 { 67 } 68 #endif 69 70 #ifdef CONFIG_INOTIFY_USER 71 72 static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 73 { 74 struct inotify_inode_mark *inode_mark; 75 struct inode *inode; 76 77 if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE) 78 return; 79 80 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); 81 inode = igrab(fsnotify_conn_inode(mark->connector)); 82 if (inode) { 83 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ", 84 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, 85 inotify_mark_user_mask(mark)); 86 show_mark_fhandle(m, inode); 87 seq_putc(m, '\n'); 88 iput(inode); 89 } 90 } 91 92 void inotify_show_fdinfo(struct seq_file *m, struct file *f) 93 { 94 show_fdinfo(m, f, inotify_fdinfo); 95 } 96 97 #endif /* CONFIG_INOTIFY_USER */ 98 99 #ifdef CONFIG_FANOTIFY 100 101 static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 102 { 103 unsigned int mflags = fanotify_mark_user_flags(mark); 104 struct inode *inode; 105 106 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) { 107 inode = igrab(fsnotify_conn_inode(mark->connector)); 108 if (!inode) 109 return; 110 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ", 111 inode->i_ino, inode->i_sb->s_dev, 112 mflags, mark->mask, mark->ignore_mask); 113 show_mark_fhandle(m, inode); 114 seq_putc(m, '\n'); 115 iput(inode); 116 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) { 117 struct mount *mnt = fsnotify_conn_mount(mark->connector); 118 119 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", 120 mnt->mnt_id, mflags, mark->mask, mark->ignore_mask); 121 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) { 122 struct super_block *sb = fsnotify_conn_sb(mark->connector); 123 124 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n", 125 sb->s_dev, mflags, mark->mask, mark->ignore_mask); 126 } 127 } 128 129 void fanotify_show_fdinfo(struct seq_file *m, struct file *f) 130 { 131 struct fsnotify_group *group = f->private_data; 132 133 seq_printf(m, "fanotify flags:%x event-flags:%x\n", 134 group->fanotify_data.flags & FANOTIFY_INIT_FLAGS, 135 group->fanotify_data.f_flags); 136 137 show_fdinfo(m, f, fanotify_fdinfo); 138 } 139 140 #endif /* CONFIG_FANOTIFY */ 141 142 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ 143 144 #endif /* CONFIG_PROC_FS */ 145