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/proc_fs.h> 15 #include <linux/exportfs.h> 16 17 #include "inotify/inotify.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 mutex_lock(&group->mark_mutex); 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 mutex_unlock(&group->mark_mutex); 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 /* 88 * IN_ALL_EVENTS represents all of the mask bits 89 * that we expose to userspace. There is at 90 * least one bit (FS_EVENT_ON_CHILD) which is 91 * used only internally to the kernel. 92 */ 93 u32 mask = mark->mask & IN_ALL_EVENTS; 94 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ", 95 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, 96 mask, mark->ignored_mask); 97 show_mark_fhandle(m, inode); 98 seq_putc(m, '\n'); 99 iput(inode); 100 } 101 } 102 103 void inotify_show_fdinfo(struct seq_file *m, struct file *f) 104 { 105 show_fdinfo(m, f, inotify_fdinfo); 106 } 107 108 #endif /* CONFIG_INOTIFY_USER */ 109 110 #ifdef CONFIG_FANOTIFY 111 112 static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 113 { 114 unsigned int mflags = 0; 115 struct inode *inode; 116 117 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY) 118 mflags |= FAN_MARK_IGNORED_SURV_MODIFY; 119 120 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) { 121 inode = igrab(fsnotify_conn_inode(mark->connector)); 122 if (!inode) 123 return; 124 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ", 125 inode->i_ino, inode->i_sb->s_dev, 126 mflags, mark->mask, mark->ignored_mask); 127 show_mark_fhandle(m, inode); 128 seq_putc(m, '\n'); 129 iput(inode); 130 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) { 131 struct mount *mnt = fsnotify_conn_mount(mark->connector); 132 133 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", 134 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask); 135 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) { 136 struct super_block *sb = fsnotify_conn_sb(mark->connector); 137 138 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n", 139 sb->s_dev, mflags, mark->mask, mark->ignored_mask); 140 } 141 } 142 143 void fanotify_show_fdinfo(struct seq_file *m, struct file *f) 144 { 145 struct fsnotify_group *group = f->private_data; 146 147 seq_printf(m, "fanotify flags:%x event-flags:%x\n", 148 group->fanotify_data.flags, group->fanotify_data.f_flags); 149 150 show_fdinfo(m, f, fanotify_fdinfo); 151 } 152 153 #endif /* CONFIG_FANOTIFY */ 154 155 #endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ 156 157 #endif /* CONFIG_PROC_FS */ 158