fsnotify.h
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上传日期:2009-04-28
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文件大小:6k
- #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
- */
- #ifdef __KERNEL__
- #include <linux/dnotify.h>
- #include <linux/inotify.h>
- /*
- * 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 char *old_name, const char *new_name,
- int isdir, struct inode *target, struct inode *source)
- {
- u32 cookie = inotify_get_cookie();
- if (old_dir == new_dir)
- inode_dir_notify(old_dir, DN_RENAME);
- else {
- inode_dir_notify(old_dir, DN_DELETE);
- inode_dir_notify(new_dir, DN_CREATE);
- }
- if (isdir)
- isdir = IN_ISDIR;
- inotify_inode_queue_event(old_dir, IN_MOVED_FROM|isdir,cookie,old_name);
- inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name);
- if (target) {
- inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL);
- inotify_inode_is_dead(target);
- }
- if (source) {
- inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL);
- }
- }
- /*
- * fsnotify_nameremove - a filename was removed from a directory
- */
- static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
- {
- if (isdir)
- isdir = IN_ISDIR;
- dnotify_parent(dentry, DN_DELETE);
- inotify_dentry_parent_queue_event(dentry, IN_DELETE|isdir, 0, dentry->d_name.name);
- }
- /*
- * fsnotify_inoderemove - an inode is going away
- */
- static inline void fsnotify_inoderemove(struct inode *inode)
- {
- inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL);
- inotify_inode_is_dead(inode);
- }
- /*
- * fsnotify_create - 'name' was linked in
- */
- static inline void fsnotify_create(struct inode *inode, const char *name)
- {
- inode_dir_notify(inode, DN_CREATE);
- inotify_inode_queue_event(inode, IN_CREATE, 0, name);
- }
- /*
- * fsnotify_mkdir - directory 'name' was created
- */
- static inline void fsnotify_mkdir(struct inode *inode, const char *name)
- {
- inode_dir_notify(inode, DN_CREATE);
- inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0, name);
- }
- /*
- * fsnotify_access - file was read
- */
- static inline void fsnotify_access(struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- u32 mask = IN_ACCESS;
- if (S_ISDIR(inode->i_mode))
- mask |= IN_ISDIR;
- dnotify_parent(dentry, DN_ACCESS);
- inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
- inotify_inode_queue_event(inode, mask, 0, NULL);
- }
- /*
- * fsnotify_modify - file was modified
- */
- static inline void fsnotify_modify(struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- u32 mask = IN_MODIFY;
- if (S_ISDIR(inode->i_mode))
- mask |= IN_ISDIR;
- dnotify_parent(dentry, DN_MODIFY);
- inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
- inotify_inode_queue_event(inode, mask, 0, NULL);
- }
- /*
- * fsnotify_open - file was opened
- */
- static inline void fsnotify_open(struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- u32 mask = IN_OPEN;
- if (S_ISDIR(inode->i_mode))
- mask |= IN_ISDIR;
- inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
- inotify_inode_queue_event(inode, mask, 0, NULL);
- }
- /*
- * fsnotify_close - file was closed
- */
- static inline void fsnotify_close(struct file *file)
- {
- struct dentry *dentry = file->f_dentry;
- struct inode *inode = dentry->d_inode;
- const char *name = dentry->d_name.name;
- mode_t mode = file->f_mode;
- u32 mask = (mode & FMODE_WRITE) ? IN_CLOSE_WRITE : IN_CLOSE_NOWRITE;
- if (S_ISDIR(inode->i_mode))
- mask |= IN_ISDIR;
- inotify_dentry_parent_queue_event(dentry, mask, 0, name);
- inotify_inode_queue_event(inode, mask, 0, NULL);
- }
- /*
- * fsnotify_xattr - extended attributes were changed
- */
- static inline void fsnotify_xattr(struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- u32 mask = IN_ATTRIB;
- if (S_ISDIR(inode->i_mode))
- mask |= IN_ISDIR;
- inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
- inotify_inode_queue_event(inode, mask, 0, NULL);
- }
- /*
- * 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;
- int dn_mask = 0;
- u32 in_mask = 0;
- if (ia_valid & ATTR_UID) {
- in_mask |= IN_ATTRIB;
- dn_mask |= DN_ATTRIB;
- }
- if (ia_valid & ATTR_GID) {
- in_mask |= IN_ATTRIB;
- dn_mask |= DN_ATTRIB;
- }
- if (ia_valid & ATTR_SIZE) {
- in_mask |= IN_MODIFY;
- dn_mask |= DN_MODIFY;
- }
- /* both times implies a utime(s) call */
- if ((ia_valid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME))
- {
- in_mask |= IN_ATTRIB;
- dn_mask |= DN_ATTRIB;
- } else if (ia_valid & ATTR_ATIME) {
- in_mask |= IN_ACCESS;
- dn_mask |= DN_ACCESS;
- } else if (ia_valid & ATTR_MTIME) {
- in_mask |= IN_MODIFY;
- dn_mask |= DN_MODIFY;
- }
- if (ia_valid & ATTR_MODE) {
- in_mask |= IN_ATTRIB;
- dn_mask |= DN_ATTRIB;
- }
- if (dn_mask)
- dnotify_parent(dentry, dn_mask);
- if (in_mask) {
- if (S_ISDIR(inode->i_mode))
- in_mask |= IN_ISDIR;
- inotify_inode_queue_event(inode, in_mask, 0, NULL);
- inotify_dentry_parent_queue_event(dentry, in_mask, 0,
- dentry->d_name.name);
- }
- }
- #ifdef CONFIG_INOTIFY /* inotify helpers */
- /*
- * fsnotify_oldname_init - save off the old filename before we change it
- */
- static inline const char *fsnotify_oldname_init(const 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 char *old_name)
- {
- kfree(old_name);
- }
- #else /* CONFIG_INOTIFY */
- static inline const char *fsnotify_oldname_init(const char *name)
- {
- return NULL;
- }
- static inline void fsnotify_oldname_free(const char *old_name)
- {
- }
- #endif /* ! CONFIG_INOTIFY */
- #endif /* __KERNEL__ */
- #endif /* _LINUX_FS_NOTIFY_H */