298 lines
7.4 KiB
C
298 lines
7.4 KiB
C
#ifndef _LINUX_FS_NOTIFY_H
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#define _LINUX_FS_NOTIFY_H
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/*
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* include/linux/fsnotify.h - generic hooks for filesystem notification, to
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* reduce in-source duplication from both dnotify and inotify.
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*
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* We don't compile any of this away in some complicated menagerie of ifdefs.
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* Instead, we rely on the code inside to optimize away as needed.
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*
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* (C) Copyright 2005 Robert Love
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*/
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#include <linux/dnotify.h>
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#include <linux/inotify.h>
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#include <linux/audit.h>
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/*
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* fsnotify_d_instantiate - instantiate a dentry for inode
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* Called with dcache_lock held.
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*/
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static inline void fsnotify_d_instantiate(struct dentry *entry,
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struct inode *inode)
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{
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inotify_d_instantiate(entry, inode);
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}
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/*
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* fsnotify_d_move - entry has been moved
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* Called with dcache_lock and entry->d_lock held.
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*/
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static inline void fsnotify_d_move(struct dentry *entry)
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{
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inotify_d_move(entry);
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}
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/*
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* fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
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*/
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static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
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const char *old_name, const char *new_name,
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int isdir, struct inode *target, struct dentry *moved)
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{
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struct inode *source = moved->d_inode;
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u32 cookie = inotify_get_cookie();
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if (old_dir == new_dir)
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inode_dir_notify(old_dir, DN_RENAME);
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else {
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inode_dir_notify(old_dir, DN_DELETE);
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inode_dir_notify(new_dir, DN_CREATE);
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}
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if (isdir)
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isdir = IN_ISDIR;
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inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir,cookie,old_name,
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source);
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inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name,
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source);
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if (target) {
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inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL, NULL);
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inotify_inode_is_dead(target);
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}
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if (source) {
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inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
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}
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audit_inode_child(new_name, moved, new_dir);
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}
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/*
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* fsnotify_nameremove - a filename was removed from a directory
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*/
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static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
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{
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if (isdir)
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isdir = IN_ISDIR;
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dnotify_parent(dentry, DN_DELETE);
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inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
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}
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/*
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* fsnotify_inoderemove - an inode is going away
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*/
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static inline void fsnotify_inoderemove(struct inode *inode)
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{
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inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
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inotify_inode_is_dead(inode);
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}
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/*
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* fsnotify_link_count - inode's link count changed
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*/
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static inline void fsnotify_link_count(struct inode *inode)
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{
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inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
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}
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/*
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* fsnotify_create - 'name' was linked in
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*/
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static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
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{
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inode_dir_notify(inode, DN_CREATE);
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inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
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dentry->d_inode);
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audit_inode_child(dentry->d_name.name, dentry, inode);
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}
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/*
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* fsnotify_link - new hardlink in 'inode' directory
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* Note: We have to pass also the linked inode ptr as some filesystems leave
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* new_dentry->d_inode NULL and instantiate inode pointer later
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*/
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static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
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{
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inode_dir_notify(dir, DN_CREATE);
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inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name,
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inode);
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fsnotify_link_count(inode);
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audit_inode_child(new_dentry->d_name.name, new_dentry, dir);
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}
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/*
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* fsnotify_mkdir - directory 'name' was created
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*/
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static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
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{
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inode_dir_notify(inode, DN_CREATE);
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inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0,
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dentry->d_name.name, dentry->d_inode);
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audit_inode_child(dentry->d_name.name, dentry, inode);
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}
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/*
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* fsnotify_access - file was read
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*/
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static inline void fsnotify_access(struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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u32 mask = IN_ACCESS;
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if (S_ISDIR(inode->i_mode))
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mask |= IN_ISDIR;
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dnotify_parent(dentry, DN_ACCESS);
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inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
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inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
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}
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/*
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* fsnotify_modify - file was modified
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*/
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static inline void fsnotify_modify(struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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u32 mask = IN_MODIFY;
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if (S_ISDIR(inode->i_mode))
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mask |= IN_ISDIR;
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dnotify_parent(dentry, DN_MODIFY);
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inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
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inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
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}
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/*
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* fsnotify_open - file was opened
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*/
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static inline void fsnotify_open(struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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u32 mask = IN_OPEN;
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if (S_ISDIR(inode->i_mode))
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mask |= IN_ISDIR;
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inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
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inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
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}
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/*
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* fsnotify_close - file was closed
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*/
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static inline void fsnotify_close(struct file *file)
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{
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struct dentry *dentry = file->f_path.dentry;
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struct inode *inode = dentry->d_inode;
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const char *name = dentry->d_name.name;
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mode_t mode = file->f_mode;
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u32 mask = (mode & FMODE_WRITE) ? IN_CLOSE_WRITE : IN_CLOSE_NOWRITE;
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if (S_ISDIR(inode->i_mode))
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mask |= IN_ISDIR;
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inotify_dentry_parent_queue_event(dentry, mask, 0, name);
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inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
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}
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/*
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* fsnotify_xattr - extended attributes were changed
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*/
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static inline void fsnotify_xattr(struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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u32 mask = IN_ATTRIB;
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if (S_ISDIR(inode->i_mode))
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mask |= IN_ISDIR;
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inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
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inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
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}
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/*
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* fsnotify_change - notify_change event. file was modified and/or metadata
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* was changed.
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*/
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static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
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{
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struct inode *inode = dentry->d_inode;
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int dn_mask = 0;
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u32 in_mask = 0;
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if (ia_valid & ATTR_UID) {
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in_mask |= IN_ATTRIB;
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dn_mask |= DN_ATTRIB;
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}
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if (ia_valid & ATTR_GID) {
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in_mask |= IN_ATTRIB;
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dn_mask |= DN_ATTRIB;
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}
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if (ia_valid & ATTR_SIZE) {
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in_mask |= IN_MODIFY;
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dn_mask |= DN_MODIFY;
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}
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/* both times implies a utime(s) call */
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if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
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{
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in_mask |= IN_ATTRIB;
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dn_mask |= DN_ATTRIB;
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} else if (ia_valid & ATTR_ATIME) {
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in_mask |= IN_ACCESS;
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dn_mask |= DN_ACCESS;
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} else if (ia_valid & ATTR_MTIME) {
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in_mask |= IN_MODIFY;
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dn_mask |= DN_MODIFY;
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}
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if (ia_valid & ATTR_MODE) {
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in_mask |= IN_ATTRIB;
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dn_mask |= DN_ATTRIB;
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}
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if (dn_mask)
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dnotify_parent(dentry, dn_mask);
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if (in_mask) {
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if (S_ISDIR(inode->i_mode))
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in_mask |= IN_ISDIR;
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inotify_inode_queue_event(inode, in_mask, 0, NULL, NULL);
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inotify_dentry_parent_queue_event(dentry, in_mask, 0,
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dentry->d_name.name);
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}
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}
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#ifdef CONFIG_INOTIFY /* inotify helpers */
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/*
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* fsnotify_oldname_init - save off the old filename before we change it
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*/
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static inline const char *fsnotify_oldname_init(const char *name)
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{
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return kstrdup(name, GFP_KERNEL);
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}
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/*
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* fsnotify_oldname_free - free the name we got from fsnotify_oldname_init
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*/
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static inline void fsnotify_oldname_free(const char *old_name)
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{
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kfree(old_name);
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}
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#else /* CONFIG_INOTIFY */
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static inline const char *fsnotify_oldname_init(const char *name)
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{
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return NULL;
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}
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static inline void fsnotify_oldname_free(const char *old_name)
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{
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}
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#endif /* ! CONFIG_INOTIFY */
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#endif /* _LINUX_FS_NOTIFY_H */
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