// SPDX-License-Identifier: GPL-2.0
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/fsnotify_backend.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/inotify.h>
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#include <linux/fanotify.h>
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#include <linux/kernel.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/exportfs.h>
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#include "inotify/inotify.h"
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#include "fsnotify.h"
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#if defined(CONFIG_PROC_FS)
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#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
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static void show_fdinfo(struct seq_file *m, struct file *f,
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void (*show)(struct seq_file *m,
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struct fsnotify_mark *mark))
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{
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struct fsnotify_group *group = f->private_data;
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struct fsnotify_mark *mark;
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mutex_lock(&group->mark_mutex);
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list_for_each_entry(mark, &group->marks_list, g_list) {
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show(m, mark);
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if (seq_has_overflowed(m))
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break;
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}
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mutex_unlock(&group->mark_mutex);
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}
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#if defined(CONFIG_EXPORTFS)
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static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
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{
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struct {
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struct file_handle handle;
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u8 pad[MAX_HANDLE_SZ];
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} f;
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int size, ret, i;
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f.handle.handle_bytes = sizeof(f.pad);
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size = f.handle.handle_bytes >> 2;
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ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
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if ((ret == FILEID_INVALID) || (ret < 0)) {
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WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
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return;
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}
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f.handle.handle_type = ret;
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f.handle.handle_bytes = size * sizeof(u32);
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seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
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f.handle.handle_bytes, f.handle.handle_type);
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for (i = 0; i < f.handle.handle_bytes; i++)
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seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
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}
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#else
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static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
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{
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}
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#endif
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#ifdef CONFIG_INOTIFY_USER
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static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
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{
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struct inotify_inode_mark *inode_mark;
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struct inode *inode;
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if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
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return;
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inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
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inode = igrab(fsnotify_conn_inode(mark->connector));
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if (inode) {
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/*
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* IN_ALL_EVENTS represents all of the mask bits
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* that we expose to userspace. There is at
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* least one bit (FS_EVENT_ON_CHILD) which is
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* used only internally to the kernel.
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*/
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u32 mask = mark->mask & IN_ALL_EVENTS;
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seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
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inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
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mask, mark->ignored_mask);
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show_mark_fhandle(m, inode);
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seq_putc(m, '\n');
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iput(inode);
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}
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}
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void inotify_show_fdinfo(struct seq_file *m, struct file *f)
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{
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show_fdinfo(m, f, inotify_fdinfo);
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}
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#endif /* CONFIG_INOTIFY_USER */
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#ifdef CONFIG_FANOTIFY
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static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
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{
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unsigned int mflags = 0;
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struct inode *inode;
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if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
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mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
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if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
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inode = igrab(fsnotify_conn_inode(mark->connector));
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if (!inode)
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return;
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seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
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inode->i_ino, inode->i_sb->s_dev,
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mflags, mark->mask, mark->ignored_mask);
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show_mark_fhandle(m, inode);
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seq_putc(m, '\n');
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iput(inode);
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} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
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struct mount *mnt = fsnotify_conn_mount(mark->connector);
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seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
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mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
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}
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}
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void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
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{
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struct fsnotify_group *group = f->private_data;
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unsigned int flags = 0;
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switch (group->priority) {
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case FS_PRIO_0:
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flags |= FAN_CLASS_NOTIF;
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break;
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case FS_PRIO_1:
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flags |= FAN_CLASS_CONTENT;
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break;
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case FS_PRIO_2:
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flags |= FAN_CLASS_PRE_CONTENT;
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break;
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}
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if (group->max_events == UINT_MAX)
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flags |= FAN_UNLIMITED_QUEUE;
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if (group->fanotify_data.max_marks == UINT_MAX)
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flags |= FAN_UNLIMITED_MARKS;
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if (group->fanotify_data.audit)
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flags |= FAN_ENABLE_AUDIT;
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seq_printf(m, "fanotify flags:%x event-flags:%x\n",
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flags, group->fanotify_data.f_flags);
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show_fdinfo(m, f, fanotify_fdinfo);
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}
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#endif /* CONFIG_FANOTIFY */
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#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
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#endif /* CONFIG_PROC_FS */
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