#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 = path->dentry->d_inode; __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, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie); fsnotify(new_dir, new_dir_mask, new_dir, 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(moved, new_dir); } /* * 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(dentry, inode); 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(new_dentry, dir); 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(dentry, inode); 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 = path->dentry->d_inode; __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 = path->dentry->d_inode; __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 = path->dentry->d_inode; __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->f_path.dentry->d_inode; 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 */