1 files changed, 344 insertions, 0 deletions
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
new file mode 100644
index 000000000..7ee1774ed
--- /dev/null
+++ b/include/linux/fsnotify.h
@@ -0,0 +1,344 @@
+#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>
+
+/*
+ * fsnotify_d_instantiate - instantiate a dentry for inode
+ */
+static inline void fsnotify_d_instantiate(struct dentry *dentry,
+					  struct inode *inode)
+{
+	__fsnotify_d_instantiate(dentry, inode);
+}
+
+/* Notify this dentry's parent about a child's events. */
+static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
+{
+	if (!dentry)
+		dentry = path->dentry;
+
+	return __fsnotify_parent(path, dentry, mask);
+}
+
+/* simple call site for access decisions */
+static inline int fsnotify_perm(struct file *file, int mask)
+{
+	struct path *path = &file->f_path;
+	struct inode *inode = file_inode(file);
+	__u32 fsnotify_mask = 0;
+	int ret;
+
+	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;
+	else if (mask & MAY_READ)
+		fsnotify_mask = FS_ACCESS_PERM;
+	else
+		BUG();
+
+	ret = fsnotify_parent(path, NULL, fsnotify_mask);
+	if (ret)
+		return ret;
+
+	return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+}
+
+/*
+ * fsnotify_d_move - dentry has been moved
+ */
+static inline void fsnotify_d_move(struct dentry *dentry)
+{
+	/*
+	 * On move we need to update dentry->d_flags to indicate if the new parent
+	 * cares about events from this dentry.
+	 */
+	__fsnotify_update_dcache_flags(dentry);
+}
+
+/*
+ * fsnotify_link_count - inode's link count changed
+ */
+static inline void fsnotify_link_count(struct inode *inode)
+{
+	fsnotify(inode, FS_ATTRIB, 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 unsigned char *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_EVENT_ON_CHILD | FS_MOVED_FROM);
+	__u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
+	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;
+	}
+
+	fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_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, FS_MOVE_SELF, moved->d_inode, 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
+ */
+static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
+{
+	__u32 mask = FS_DELETE;
+
+	if (isdir)
+		mask |= FS_ISDIR;
+
+	fsnotify_parent(NULL, dentry, mask);
+}
+
+/*
+ * fsnotify_inoderemove - an inode is going away
+ */
+static inline void fsnotify_inoderemove(struct inode *inode)
+{
+	fsnotify(inode, FS_DELETE_SELF, 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(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+}
+
+/*
+ * 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)
+{
+	__u32 mask = (FS_CREATE | FS_ISDIR);
+	struct inode *d_inode = dentry->d_inode;
+
+	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
+
+	fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+}
+
+/*
+ * fsnotify_access - file was read
+ */
+static inline void fsnotify_access(struct file *file)
+{
+	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_parent(path, NULL, mask);
+		fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+	}
+}
+
+/*
+ * fsnotify_modify - file was modified
+ */
+static inline void fsnotify_modify(struct file *file)
+{
+	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_parent(path, NULL, mask);
+		fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+	}
+}
+
+/*
+ * fsnotify_open - file was opened
+ */
+static inline void fsnotify_open(struct file *file)
+{
+	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;
+
+	fsnotify_parent(path, NULL, mask);
+	fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+}
+
+/*
+ * fsnotify_close - file was closed
+ */
+static inline void fsnotify_close(struct file *file)
+{
+	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_parent(path, NULL, mask);
+		fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+	}
+}
+
+/*
+ * 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);
+	}
+}
+
+#if defined(CONFIG_FSNOTIFY)	/* notify helpers */
+
+/*
+ * fsnotify_oldname_init - save off the old filename before we change it
+ */
+static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name)
+{
+	return kstrdup(name, GFP_KERNEL);
+}
+
+/*
+ * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
+ */
+static inline void fsnotify_oldname_free(const unsigned char *old_name)
+{
+	kfree(old_name);
+}
+
+#else	/* CONFIG_FSNOTIFY */
+
+static inline const char *fsnotify_oldname_init(const unsigned char *name)
+{
+	return NULL;
+}
+
+static inline void fsnotify_oldname_free(const unsigned char *old_name)
+{
+}
+
+#endif	/*  CONFIG_FSNOTIFY */
+
+#endif	/* _LINUX_FS_NOTIFY_H */