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/* SPDX-License-Identifier: GPL-2.0 / #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> / * Notify this @dir inode about a change in the directory entry @dentry. * * Unlike fsnotify_parent(), the event will be reported regardless of the * FS_EVENT_ON_CHILD mask on the parent inode. / static inline int fsnotify_dirent(struct inode dir, struct dentry dentry, __u32 mask) { return fsnotify(dir, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE, &dentry->d_name, 0); } / Notify this dentry's parent about a child's events. / static inline int fsnotify_parent(const struct path path, struct dentry dentry, __u32 mask) { if (!dentry) dentry = path->dentry; return __fsnotify_parent(path, dentry, mask); } / * Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when * an event is on a path. / static inline int fsnotify_path(struct inode inode, const struct path path, __u32 mask) { int ret = fsnotify_parent(path, NULL, mask); if (ret) return ret; return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); } / Simple call site for access decisions / static inline int fsnotify_perm(struct file file, int mask) { int ret; const struct path path = &file->f_path; struct inode inode = file_inode(file); __u32 fsnotify_mask = 0; /* * FMODE_NONOTIFY are fds generated by fanotify itself which should not * generate new events. We also don't want to generate events for * FMODE_PATH fds (involves open & close events) as they are just * handle creation / destruction events and not "real" file events. / if (file->f_mode & (FMODE_NONOTIFY \| FMODE_PATH)) return 0; if (!(mask & (MAY_READ \| MAY_OPEN))) return 0; if (mask & MAY_OPEN) { fsnotify_mask = FS_OPEN_PERM; if (file->f_flags & __FMODE_EXEC) { ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM); if (ret) return ret; } } else if (mask & MAY_READ) { fsnotify_mask = FS_ACCESS_PERM; } if (S_ISDIR(inode->i_mode)) fsnotify_mask \|= FS_ISDIR; return fsnotify_path(inode, path, fsnotify_mask); } / * fsnotify_link_count - inode's link count changed / static inline void fsnotify_link_count(struct inode inode) { __u32 mask = FS_ATTRIB; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; fsnotify(inode, mask, 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 struct qstr 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_MOVED_FROM; __u32 new_dir_mask = FS_MOVED_TO; __u32 mask = FS_MOVE_SELF; const struct qstr new_name = &moved->d_name; if (old_dir == new_dir) old_dir_mask \|= FS_DN_RENAME; if (isdir) { old_dir_mask \|= FS_ISDIR; new_dir_mask \|= FS_ISDIR; mask \|= FS_ISDIR; } fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name, fs_cookie); fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name, fs_cookie); if (target) fsnotify_link_count(target); if (source) fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0); audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); } /* * 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_inoderemove - an inode is going away / static inline void fsnotify_inoderemove(struct inode inode) { __u32 mask = FS_DELETE_SELF; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; fsnotify(inode, mask, 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(inode, dentry, AUDIT_TYPE_CHILD_CREATE); fsnotify_dirent(inode, dentry, FS_CREATE); } / * 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(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, &new_dentry->d_name, 0); } /* * fsnotify_delete - @dentry was unlinked and unhashed * * Caller must make sure that dentry->d_name is stable. * * Note: unlike fsnotify_unlink(), we have to pass also the unlinked inode * as this may be called after d_delete() and old_dentry may be negative. / static inline void fsnotify_delete(struct inode dir, struct inode inode, struct dentry dentry) { __u32 mask = FS_DELETE; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; fsnotify(dir, mask, inode, FSNOTIFY_EVENT_INODE, &dentry->d_name, 0); } /** * d_delete_notify - delete a dentry and call fsnotify_delete() * @dentry: The dentry to delete * * This helper is used to guaranty that the unlinked inode cannot be found * by lookup of this name after fsnotify_delete() event has been delivered. / static inline void d_delete_notify(struct inode dir, struct dentry dentry) { struct inode inode = d_inode(dentry); ihold(inode); d_delete(dentry); fsnotify_delete(dir, inode, dentry); iput(inode); } /* * fsnotify_unlink - 'name' was unlinked * * Caller must make sure that dentry->d_name is stable. / static inline void fsnotify_unlink(struct inode dir, struct dentry dentry) { if (WARN_ON_ONCE(d_is_negative(dentry))) return; fsnotify_delete(dir, d_inode(dentry), dentry); } / * fsnotify_mkdir - directory 'name' was created / static inline void fsnotify_mkdir(struct inode inode, struct dentry dentry) { audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); fsnotify_dirent(inode, dentry, FS_CREATE \| FS_ISDIR); } / * fsnotify_rmdir - directory 'name' was removed * * Caller must make sure that dentry->d_name is stable. / static inline void fsnotify_rmdir(struct inode dir, struct dentry dentry) { if (WARN_ON_ONCE(d_is_negative(dentry))) return; fsnotify_delete(dir, d_inode(dentry), dentry); } / * fsnotify_access - file was read / static inline void fsnotify_access(struct file file) { const struct path path = &file->f_path; struct inode inode = file_inode(file); __u32 mask = FS_ACCESS; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; if (!(file->f_mode & FMODE_NONOTIFY)) fsnotify_path(inode, path, mask); } /* * fsnotify_modify - file was modified / static inline void fsnotify_modify(struct file file) { const struct path path = &file->f_path; struct inode inode = file_inode(file); __u32 mask = FS_MODIFY; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; if (!(file->f_mode & FMODE_NONOTIFY)) fsnotify_path(inode, path, mask); } /* * fsnotify_open - file was opened / static inline void fsnotify_open(struct file file) { const struct path path = &file->f_path; struct inode inode = file_inode(file); __u32 mask = FS_OPEN; if (S_ISDIR(inode->i_mode)) mask \|= FS_ISDIR; if (file->f_flags & __FMODE_EXEC) mask \|= FS_OPEN_EXEC; fsnotify_path(inode, path, mask); } /* * fsnotify_close - file was closed / static inline void fsnotify_close(struct file file) { const struct path path = &file->f_path; struct inode inode = file_inode(file); 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_path(inode, path, mask); } /* * 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); } } #endif / _LINUX_FS_NOTIFY_H */

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