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 "fdinfo.h" 18#include "fsnotify.h" 19 20#if defined(CONFIG_PROC_FS) 21 22#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY) 23 24static void show_fdinfo(struct seq_file *m, struct file *f, 25 void (*show)(struct seq_file *m, 26 struct fsnotify_mark *mark)) 27{ 28 struct fsnotify_group *group = f->private_data; 29 struct fsnotify_mark *mark; 30 31 mutex_lock(&group->mark_mutex); 32 list_for_each_entry(mark, &group->marks_list, g_list) { 33 show(m, mark); 34 if (seq_has_overflowed(m)) 35 break; 36 } 37 mutex_unlock(&group->mark_mutex); 38} 39 40#if defined(CONFIG_EXPORTFS) 41static void show_mark_fhandle(struct seq_file *m, struct inode *inode) 42{ 43 struct { 44 struct file_handle handle; 45 u8 pad[MAX_HANDLE_SZ]; 46 } f; 47 int size, ret, i; 48 49 f.handle.handle_bytes = sizeof(f.pad); 50 size = f.handle.handle_bytes >> 2; 51 52 ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, NULL); 53 if ((ret == FILEID_INVALID) || (ret < 0)) { 54 WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret); 55 return; 56 } 57 58 f.handle.handle_type = ret; 59 f.handle.handle_bytes = size * sizeof(u32); 60 61 seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:", 62 f.handle.handle_bytes, f.handle.handle_type); 63 64 for (i = 0; i < f.handle.handle_bytes; i++) 65 seq_printf(m, "%02x", (int)f.handle.f_handle[i]); 66} 67#else 68static void show_mark_fhandle(struct seq_file *m, struct inode *inode) 69{ 70} 71#endif 72 73#ifdef CONFIG_INOTIFY_USER 74 75static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 76{ 77 struct inotify_inode_mark *inode_mark; 78 struct inode *inode; 79 80 if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE) 81 return; 82 83 inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); 84 inode = igrab(fsnotify_conn_inode(mark->connector)); 85 if (inode) { 86 seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ", 87 inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, 88 inotify_mark_user_mask(mark)); 89 show_mark_fhandle(m, inode); 90 seq_putc(m, '\n'); 91 iput(inode); 92 } 93} 94 95void inotify_show_fdinfo(struct seq_file *m, struct file *f) 96{ 97 show_fdinfo(m, f, inotify_fdinfo); 98} 99 100#endif /* CONFIG_INOTIFY_USER */ 101 102#ifdef CONFIG_FANOTIFY 103 104static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) 105{ 106 unsigned int mflags = 0; 107 struct inode *inode; 108 109 if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY) 110 mflags |= FAN_MARK_IGNORED_SURV_MODIFY; 111 112 if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) { 113 inode = igrab(fsnotify_conn_inode(mark->connector)); 114 if (!inode) 115 return; 116 seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ", 117 inode->i_ino, inode->i_sb->s_dev, 118 mflags, mark->mask, mark->ignored_mask); 119 show_mark_fhandle(m, inode); 120 seq_putc(m, '\n'); 121 iput(inode); 122 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) { 123 struct mount *mnt = fsnotify_conn_mount(mark->connector); 124 125 seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n", 126 mnt->mnt_id, mflags, mark->mask, mark->ignored_mask); 127 } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) { 128 struct super_block *sb = fsnotify_conn_sb(mark->connector); 129 130 seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n", 131 sb->s_dev, mflags, mark->mask, mark->ignored_mask); 132 } 133} 134 135void fanotify_show_fdinfo(struct seq_file *m, struct file *f) 136{ 137 struct fsnotify_group *group = f->private_data; 138 139 seq_printf(m, "fanotify flags:%x event-flags:%x\n", 140 group->fanotify_data.flags, group->fanotify_data.f_flags); 141 142 show_fdinfo(m, f, fanotify_fdinfo); 143} 144 145#endif /* CONFIG_FANOTIFY */ 146 147#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */ 148 149#endif /* CONFIG_PROC_FS */ 150