3be25f49b9
This patch creates a way for fsnotify groups to attach marks to inodes. These marks have little meaning to the generic fsnotify infrastructure and thus their meaning should be interpreted by the group that attached them to the inode's list. dnotify and inotify will make use of these markings to indicate which inodes are of interest to their respective groups. But this implementation has the useful property that in the future other listeners could actually use the marks for the exact opposite reason, aka to indicate which inodes it had NO interest in. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>
352 lines
8.9 KiB
C
352 lines
8.9 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/fsnotify_backend.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_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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fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE);
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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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__u32 old_dir_mask = 0;
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__u32 new_dir_mask = 0;
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if (old_dir == new_dir) {
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inode_dir_notify(old_dir, DN_RENAME);
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old_dir_mask = FS_DN_RENAME;
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} else {
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inode_dir_notify(old_dir, DN_DELETE);
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old_dir_mask = FS_DELETE;
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inode_dir_notify(new_dir, DN_CREATE);
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new_dir_mask = FS_CREATE;
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}
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if (isdir) {
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isdir = IN_ISDIR;
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old_dir_mask |= FS_IN_ISDIR;
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new_dir_mask |= FS_IN_ISDIR;
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}
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old_dir_mask |= FS_MOVED_FROM;
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new_dir_mask |= FS_MOVED_TO;
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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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fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE);
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fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE);
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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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/* this is really a link_count change not a removal */
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fsnotify_link_count(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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fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE);
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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_inode_delete - and inode is being evicted from cache, clean up is needed
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*/
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static inline void fsnotify_inode_delete(struct inode *inode)
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{
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__fsnotify_inode_delete(inode);
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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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__u32 mask = FS_DELETE;
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if (isdir)
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mask |= FS_IN_ISDIR;
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dnotify_parent(dentry, DN_DELETE);
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inotify_dentry_parent_queue_event(dentry, mask, 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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fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE);
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__fsnotify_inode_delete(inode);
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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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fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_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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fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE);
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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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__u32 mask = (FS_CREATE | FS_IN_ISDIR);
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struct inode *d_inode = dentry->d_inode;
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inode_dir_notify(inode, DN_CREATE);
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inotify_inode_queue_event(inode, mask, 0, dentry->d_name.name, d_inode);
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audit_inode_child(dentry->d_name.name, dentry, inode);
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fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_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 = FS_ACCESS;
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if (S_ISDIR(inode->i_mode))
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mask |= FS_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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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
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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 = FS_MODIFY;
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if (S_ISDIR(inode->i_mode))
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mask |= FS_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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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
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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 = FS_OPEN;
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if (S_ISDIR(inode->i_mode))
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mask |= FS_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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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
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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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fmode_t mode = file->f_mode;
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__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
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if (S_ISDIR(inode->i_mode))
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mask |= FS_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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fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE);
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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 = FS_ATTRIB;
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if (S_ISDIR(inode->i_mode))
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mask |= FS_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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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
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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 |= FS_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 |= FS_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 |= FS_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 |= FS_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 |= FS_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 |= FS_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 |= FS_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 |= FS_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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fsnotify(inode, in_mask, inode, FSNOTIFY_EVENT_INODE);
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}
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}
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#if defined(CONFIG_INOTIFY) || defined(CONFIG_FSNOTIFY) /* notify 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 || CONFIG_FSNOTIFY */
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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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