7a91bf7f5c
The patch below unhooks fsnotify from vfs_unlink & vfs_rmdir. It introduces two new fsnotify calls, that are hooked in at the dcache level. This not only more closely matches how the VFS layer works, it also avoids the problem with locking and inode lifetimes. The two functions are - fsnotify_nameremove -- called when a directory entry is going away. It notifies the PARENT of the deletion. This is called from d_delete(). - inoderemove -- called when the files inode itself is going away. It notifies the inode that is being deleted. This is called from dentry_iput(). Signed-off-by: John McCutchan <ttb@tentacle.dhs.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
272 lines
6.5 KiB
C
272 lines
6.5 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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#ifdef __KERNEL__
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#include <linux/dnotify.h>
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#include <linux/inotify.h>
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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)
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{
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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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inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name);
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if (target) {
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inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL);
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inotify_inode_is_dead(target);
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}
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}
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/*
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* fsnotify_unlink - file was unlinked
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*/
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static inline void fsnotify_unlink(struct dentry *dentry, struct inode *inode, struct inode *dir)
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{
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inode_dir_notify(dir, DN_DELETE);
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inotify_inode_queue_event(dir, IN_DELETE, 0, dentry->d_name.name);
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inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL);
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inotify_inode_is_dead(inode);
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}
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/*
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* fsnotify_rmdir - directory was removed
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*/
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static inline void fsnotify_rmdir(struct dentry *dentry, struct inode *inode,
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struct inode *dir)
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{
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inode_dir_notify(dir, DN_DELETE);
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inotify_inode_queue_event(dir,IN_DELETE|IN_ISDIR,0,dentry->d_name.name);
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inotify_inode_queue_event(inode, IN_DELETE_SELF | IN_ISDIR, 0, NULL);
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inotify_inode_is_dead(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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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);
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inotify_inode_is_dead(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, const char *name)
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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, name);
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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, const char *name)
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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, name);
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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);
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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);
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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);
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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_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);
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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);
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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);
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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 /* __KERNEL__ */
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#endif /* _LINUX_FS_NOTIFY_H */
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