include/linux/fsnotify.h - kernel/msm-5.4 - Gitiles

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_FS_NOTIFY_H
 #define _LINUX_FS_NOTIFY_H

 /*
  * include/linux/fsnotify.h - generic hooks for filesystem notification, to
  * reduce in-source duplication from both dnotify and inotify.
  *
  * We don't compile any of this away in some complicated menagerie of ifdefs.
  * Instead, we rely on the code inside to optimize away as needed.
  *
  * (C) Copyright 2005 Robert Love
  */

 #include <linux/fsnotify_backend.h>
 #include <linux/audit.h>
 #include <linux/slab.h>
 #include <linux/bug.h>

 /*
  * Notify this @dir inode about a change in the directory entry @dentry.
  *
  * Unlike fsnotify_parent(), the event will be reported regardless of the
  * FS_EVENT_ON_CHILD mask on the parent inode.
  */
 static inline int fsnotify_dirent(struct inode *dir, struct dentry *dentry,
 				  __u32 mask)
 {
 	return fsnotify(dir, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
 			dentry->d_name.name, 0);
 }

 /* Notify this dentry's parent about a child's events. */
 static inline int fsnotify_parent(const struct path *path,
 				  struct dentry *dentry, __u32 mask)
 {
 	if (!dentry)
 		dentry = path->dentry;

 	return __fsnotify_parent(path, dentry, mask);
 }

 /*
  * Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when
  * an event is on a path.
  */
 static inline int fsnotify_path(struct inode *inode, const struct path *path,
 				__u32 mask)
 {
 	int ret = fsnotify_parent(path, NULL, mask);

 	if (ret)
 		return ret;
 	return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }

 /* Simple call site for access decisions */
 static inline int fsnotify_perm(struct file *file, int mask)
 {
 	int ret;
 	const struct path *path = &file->f_path;
 	struct inode *inode = file_inode(file);
 	__u32 fsnotify_mask = 0;

 	if (file->f_mode & FMODE_NONOTIFY)
 		return 0;
 	if (!(mask & (MAY_READ | MAY_OPEN)))
 		return 0;
 	if (mask & MAY_OPEN) {
 		fsnotify_mask = FS_OPEN_PERM;

 		if (file->f_flags & __FMODE_EXEC) {
 			ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);

 			if (ret)
 				return ret;
 		}
 	} else if (mask & MAY_READ) {
 		fsnotify_mask = FS_ACCESS_PERM;
 	}

 	if (S_ISDIR(inode->i_mode))
 		fsnotify_mask |= FS_ISDIR;

 	return fsnotify_path(inode, path, fsnotify_mask);
 }

 /*
  * fsnotify_link_count - inode's link count changed
  */
 static inline void fsnotify_link_count(struct inode *inode)
 {
 	__u32 mask = FS_ATTRIB;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
 }

 /*
  * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
  */
 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 				 const struct qstr *old_name,
 				 int isdir, struct inode *target,
 				 struct dentry *moved)
 {
 	struct inode *source = moved->d_inode;
 	u32 fs_cookie = fsnotify_get_cookie();
 	__u32 old_dir_mask = FS_MOVED_FROM;
 	__u32 new_dir_mask = FS_MOVED_TO;
 	__u32 mask = FS_MOVE_SELF;
 	const unsigned char *new_name = moved->d_name.name;

 	if (old_dir == new_dir)
 		old_dir_mask |= FS_DN_RENAME;

 	if (isdir) {
 		old_dir_mask |= FS_ISDIR;
 		new_dir_mask |= FS_ISDIR;
 		mask |= FS_ISDIR;
 	}

 	fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name->name,
 		 fs_cookie);
 	fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
 		 fs_cookie);

 	if (target)
 		fsnotify_link_count(target);

 	if (source)
 		fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
 	audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
 }

 /*
  * fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
  */
 static inline void fsnotify_inode_delete(struct inode *inode)
 {
 	__fsnotify_inode_delete(inode);
 }

 /*
  * fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
  */
 static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
 {
 	__fsnotify_vfsmount_delete(mnt);
 }

 /*
  * fsnotify_nameremove - a filename was removed from a directory
  *
  * This is mostly called under parent vfs inode lock so name and
  * dentry->d_parent should be stable. However there are some corner cases where
  * inode lock is not held. So to be on the safe side and be reselient to future
  * callers and out of tree users of d_delete(), we do not assume that d_parent
  * and d_name are stable and we use dget_parent() and
  * take_dentry_name_snapshot() to grab stable references.
  */
 static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
 {
 	struct dentry *parent;
 	struct name_snapshot name;
 	__u32 mask = FS_DELETE;

 	/* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */
 	if (IS_ROOT(dentry))
 		return;

 	if (isdir)
 		mask |= FS_ISDIR;

 	parent = dget_parent(dentry);
 	take_dentry_name_snapshot(&name, dentry);

 	fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
 		 name.name.name, 0);

 	release_dentry_name_snapshot(&name);
 	dput(parent);
 }

 /*
  * fsnotify_inoderemove - an inode is going away
  */
 static inline void fsnotify_inoderemove(struct inode *inode)
 {
 	__u32 mask = FS_DELETE_SELF;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
 	__fsnotify_inode_delete(inode);
 }

 /*
  * fsnotify_create - 'name' was linked in
  */
 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 {
 	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);

 	fsnotify_dirent(inode, dentry, FS_CREATE);
 }

 /*
  * fsnotify_link - new hardlink in 'inode' directory
  * Note: We have to pass also the linked inode ptr as some filesystems leave
  *   new_dentry->d_inode NULL and instantiate inode pointer later
  */
 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
 {
 	fsnotify_link_count(inode);
 	audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);

 	fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
 }

 /*
  * fsnotify_mkdir - directory 'name' was created
  */
 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 {
 	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);

 	fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
 }

 /*
  * fsnotify_access - file was read
  */
 static inline void fsnotify_access(struct file *file)
 {
 	const struct path *path = &file->f_path;
 	struct inode *inode = file_inode(file);
 	__u32 mask = FS_ACCESS;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	if (!(file->f_mode & FMODE_NONOTIFY))
 		fsnotify_path(inode, path, mask);
 }

 /*
  * fsnotify_modify - file was modified
  */
 static inline void fsnotify_modify(struct file *file)
 {
 	const struct path *path = &file->f_path;
 	struct inode *inode = file_inode(file);
 	__u32 mask = FS_MODIFY;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	if (!(file->f_mode & FMODE_NONOTIFY))
 		fsnotify_path(inode, path, mask);
 }

 /*
  * fsnotify_open - file was opened
  */
 static inline void fsnotify_open(struct file *file)
 {
 	const struct path *path = &file->f_path;
 	struct inode *inode = file_inode(file);
 	__u32 mask = FS_OPEN;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;
 	if (file->f_flags & __FMODE_EXEC)
 		mask |= FS_OPEN_EXEC;

 	fsnotify_path(inode, path, mask);
 }

 /*
  * fsnotify_close - file was closed
  */
 static inline void fsnotify_close(struct file *file)
 {
 	const struct path *path = &file->f_path;
 	struct inode *inode = file_inode(file);
 	fmode_t mode = file->f_mode;
 	__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	if (!(file->f_mode & FMODE_NONOTIFY))
 		fsnotify_path(inode, path, mask);
 }

 /*
  * fsnotify_xattr - extended attributes were changed
  */
 static inline void fsnotify_xattr(struct dentry *dentry)
 {
 	struct inode *inode = dentry->d_inode;
 	__u32 mask = FS_ATTRIB;

 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_ISDIR;

 	fsnotify_parent(NULL, dentry, mask);
 	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
 }

 /*
  * fsnotify_change - notify_change event.  file was modified and/or metadata
  * was changed.
  */
 static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
 {
 	struct inode *inode = dentry->d_inode;
 	__u32 mask = 0;

 	if (ia_valid & ATTR_UID)
 		mask |= FS_ATTRIB;
 	if (ia_valid & ATTR_GID)
 		mask |= FS_ATTRIB;
 	if (ia_valid & ATTR_SIZE)
 		mask |= FS_MODIFY;

 	/* both times implies a utime(s) call */
 	if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
 		mask |= FS_ATTRIB;
 	else if (ia_valid & ATTR_ATIME)
 		mask |= FS_ACCESS;
 	else if (ia_valid & ATTR_MTIME)
 		mask |= FS_MODIFY;

 	if (ia_valid & ATTR_MODE)
 		mask |= FS_ATTRIB;

 	if (mask) {
 		if (S_ISDIR(inode->i_mode))
 			mask |= FS_ISDIR;

 		fsnotify_parent(NULL, dentry, mask);
 		fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
 	}
 }

 #endif	/* _LINUX_FS_NOTIFY_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _LINUX_FS_NOTIFY_H
	#define _LINUX_FS_NOTIFY_H

	/*
	* include/linux/fsnotify.h - generic hooks for filesystem notification, to
	* reduce in-source duplication from both dnotify and inotify.
	*
	* We don't compile any of this away in some complicated menagerie of ifdefs.
	* Instead, we rely on the code inside to optimize away as needed.
	*
	* (C) Copyright 2005 Robert Love
	*/

	#include <linux/fsnotify_backend.h>
	#include <linux/audit.h>
	#include <linux/slab.h>
	#include <linux/bug.h>

	/*
	* Notify this @dir inode about a change in the directory entry @dentry.
	*
	* Unlike fsnotify_parent(), the event will be reported regardless of the
	* FS_EVENT_ON_CHILD mask on the parent inode.
	*/
	static inline int fsnotify_dirent(struct inode dir, struct dentry dentry,
	__u32 mask)
	{
	return fsnotify(dir, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
	dentry->d_name.name, 0);
	}

	/* Notify this dentry's parent about a child's events. */
	static inline int fsnotify_parent(const struct path *path,
	struct dentry *dentry, __u32 mask)
	{
	if (!dentry)
	dentry = path->dentry;

	return __fsnotify_parent(path, dentry, mask);
	}

	/*
	* Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when
	* an event is on a path.
	*/
	static inline int fsnotify_path(struct inode inode, const struct path path,
	__u32 mask)
	{
	int ret = fsnotify_parent(path, NULL, mask);

	if (ret)
	return ret;
	return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
	}

	/* Simple call site for access decisions */
	static inline int fsnotify_perm(struct file *file, int mask)
	{
	int ret;
	const struct path *path = &file->f_path;
	struct inode *inode = file_inode(file);
	__u32 fsnotify_mask = 0;

	if (file->f_mode & FMODE_NONOTIFY)
	return 0;
	if (!(mask & (MAY_READ \| MAY_OPEN)))
	return 0;
	if (mask & MAY_OPEN) {
	fsnotify_mask = FS_OPEN_PERM;

	if (file->f_flags & __FMODE_EXEC) {
	ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);

	if (ret)
	return ret;
	}
	} else if (mask & MAY_READ) {
	fsnotify_mask = FS_ACCESS_PERM;
	}

	if (S_ISDIR(inode->i_mode))
	fsnotify_mask \|= FS_ISDIR;

	return fsnotify_path(inode, path, fsnotify_mask);
	}

	/*
	* fsnotify_link_count - inode's link count changed
	*/
	static inline void fsnotify_link_count(struct inode *inode)
	{
	__u32 mask = FS_ATTRIB;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
	}

	/*
	* fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
	*/
	static inline void fsnotify_move(struct inode old_dir, struct inode new_dir,
	const struct qstr *old_name,
	int isdir, struct inode *target,
	struct dentry *moved)
	{
	struct inode *source = moved->d_inode;
	u32 fs_cookie = fsnotify_get_cookie();
	__u32 old_dir_mask = FS_MOVED_FROM;
	__u32 new_dir_mask = FS_MOVED_TO;
	__u32 mask = FS_MOVE_SELF;
	const unsigned char *new_name = moved->d_name.name;

	if (old_dir == new_dir)
	old_dir_mask \|= FS_DN_RENAME;

	if (isdir) {
	old_dir_mask \|= FS_ISDIR;
	new_dir_mask \|= FS_ISDIR;
	mask \|= FS_ISDIR;
	}

	fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name->name,
	fs_cookie);
	fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
	fs_cookie);

	if (target)
	fsnotify_link_count(target);

	if (source)
	fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
	audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
	}

	/*
	* fsnotify_inode_delete - and inode is being evicted from cache, clean up is needed
	*/
	static inline void fsnotify_inode_delete(struct inode *inode)
	{
	__fsnotify_inode_delete(inode);
	}

	/*
	* fsnotify_vfsmount_delete - a vfsmount is being destroyed, clean up is needed
	*/
	static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
	{
	__fsnotify_vfsmount_delete(mnt);
	}

	/*
	* fsnotify_nameremove - a filename was removed from a directory
	*
	* This is mostly called under parent vfs inode lock so name and
	* dentry->d_parent should be stable. However there are some corner cases where
	* inode lock is not held. So to be on the safe side and be reselient to future
	* callers and out of tree users of d_delete(), we do not assume that d_parent
	* and d_name are stable and we use dget_parent() and
	* take_dentry_name_snapshot() to grab stable references.
	*/
	static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
	{
	struct dentry *parent;
	struct name_snapshot name;
	__u32 mask = FS_DELETE;

	/* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */
	if (IS_ROOT(dentry))
	return;

	if (isdir)
	mask \|= FS_ISDIR;

	parent = dget_parent(dentry);
	take_dentry_name_snapshot(&name, dentry);

	fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
	name.name.name, 0);

	release_dentry_name_snapshot(&name);
	dput(parent);
	}

	/*
	* fsnotify_inoderemove - an inode is going away
	*/
	static inline void fsnotify_inoderemove(struct inode *inode)
	{
	__u32 mask = FS_DELETE_SELF;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
	__fsnotify_inode_delete(inode);
	}

	/*
	* fsnotify_create - 'name' was linked in
	*/
	static inline void fsnotify_create(struct inode inode, struct dentry dentry)
	{
	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);

	fsnotify_dirent(inode, dentry, FS_CREATE);
	}

	/*
	* fsnotify_link - new hardlink in 'inode' directory
	* Note: We have to pass also the linked inode ptr as some filesystems leave
	* new_dentry->d_inode NULL and instantiate inode pointer later
	*/
	static inline void fsnotify_link(struct inode dir, struct inode inode, struct dentry *new_dentry)
	{
	fsnotify_link_count(inode);
	audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);

	fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
	}

	/*
	* fsnotify_mkdir - directory 'name' was created
	*/
	static inline void fsnotify_mkdir(struct inode inode, struct dentry dentry)
	{
	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);

	fsnotify_dirent(inode, dentry, FS_CREATE \| FS_ISDIR);
	}

	/*
	* fsnotify_access - file was read
	*/
	static inline void fsnotify_access(struct file *file)
	{
	const struct path *path = &file->f_path;
	struct inode *inode = file_inode(file);
	__u32 mask = FS_ACCESS;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	if (!(file->f_mode & FMODE_NONOTIFY))
	fsnotify_path(inode, path, mask);
	}

	/*
	* fsnotify_modify - file was modified
	*/
	static inline void fsnotify_modify(struct file *file)
	{
	const struct path *path = &file->f_path;
	struct inode *inode = file_inode(file);
	__u32 mask = FS_MODIFY;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	if (!(file->f_mode & FMODE_NONOTIFY))
	fsnotify_path(inode, path, mask);
	}

	/*
	* fsnotify_open - file was opened
	*/
	static inline void fsnotify_open(struct file *file)
	{
	const struct path *path = &file->f_path;
	struct inode *inode = file_inode(file);
	__u32 mask = FS_OPEN;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;
	if (file->f_flags & __FMODE_EXEC)
	mask \|= FS_OPEN_EXEC;

	fsnotify_path(inode, path, mask);
	}

	/*
	* fsnotify_close - file was closed
	*/
	static inline void fsnotify_close(struct file *file)
	{
	const struct path *path = &file->f_path;
	struct inode *inode = file_inode(file);
	fmode_t mode = file->f_mode;
	__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	if (!(file->f_mode & FMODE_NONOTIFY))
	fsnotify_path(inode, path, mask);
	}

	/*
	* fsnotify_xattr - extended attributes were changed
	*/
	static inline void fsnotify_xattr(struct dentry *dentry)
	{
	struct inode *inode = dentry->d_inode;
	__u32 mask = FS_ATTRIB;

	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	fsnotify_parent(NULL, dentry, mask);
	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
	}

	/*
	* fsnotify_change - notify_change event. file was modified and/or metadata
	* was changed.
	*/
	static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
	{
	struct inode *inode = dentry->d_inode;
	__u32 mask = 0;

	if (ia_valid & ATTR_UID)
	mask \|= FS_ATTRIB;
	if (ia_valid & ATTR_GID)
	mask \|= FS_ATTRIB;
	if (ia_valid & ATTR_SIZE)
	mask \|= FS_MODIFY;

	/* both times implies a utime(s) call */
	if ((ia_valid & (ATTR_ATIME \| ATTR_MTIME)) == (ATTR_ATIME \| ATTR_MTIME))
	mask \|= FS_ATTRIB;
	else if (ia_valid & ATTR_ATIME)
	mask \|= FS_ACCESS;
	else if (ia_valid & ATTR_MTIME)
	mask \|= FS_MODIFY;

	if (ia_valid & ATTR_MODE)
	mask \|= FS_ATTRIB;

	if (mask) {
	if (S_ISDIR(inode->i_mode))
	mask \|= FS_ISDIR;

	fsnotify_parent(NULL, dentry, mask);
	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
	}
	}

	#endif /* _LINUX_FS_NOTIFY_H */