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313 lines
7.7 KiB
313 lines
7.7 KiB
#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/fsnotify_backend.h> |
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#include <linux/audit.h> |
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#include <linux/slab.h> |
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#include <linux/bug.h> |
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/* |
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* fsnotify_d_instantiate - instantiate a dentry for inode |
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*/ |
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static inline void fsnotify_d_instantiate(struct dentry *dentry, |
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struct inode *inode) |
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{ |
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__fsnotify_d_instantiate(dentry, inode); |
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} |
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/* Notify this dentry's parent about a child's events. */ |
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static inline int fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask) |
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{ |
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if (!dentry) |
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dentry = path->dentry; |
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return __fsnotify_parent(path, dentry, mask); |
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} |
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/* simple call site for access decisions */ |
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static inline int fsnotify_perm(struct file *file, int mask) |
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{ |
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struct path *path = &file->f_path; |
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struct inode *inode = file_inode(file); |
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__u32 fsnotify_mask = 0; |
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int ret; |
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if (file->f_mode & FMODE_NONOTIFY) |
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return 0; |
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if (!(mask & (MAY_READ | MAY_OPEN))) |
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return 0; |
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if (mask & MAY_OPEN) |
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fsnotify_mask = FS_OPEN_PERM; |
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else if (mask & MAY_READ) |
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fsnotify_mask = FS_ACCESS_PERM; |
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else |
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BUG(); |
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ret = fsnotify_parent(path, NULL, fsnotify_mask); |
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if (ret) |
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return ret; |
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return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
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} |
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/* |
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* fsnotify_d_move - dentry has been moved |
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*/ |
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static inline void fsnotify_d_move(struct dentry *dentry) |
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{ |
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/* |
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* On move we need to update dentry->d_flags to indicate if the new parent |
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* cares about events from this dentry. |
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*/ |
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__fsnotify_update_dcache_flags(dentry); |
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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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fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
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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 unsigned char *old_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 fs_cookie = fsnotify_get_cookie(); |
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__u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); |
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__u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); |
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const unsigned char *new_name = moved->d_name.name; |
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if (old_dir == new_dir) |
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old_dir_mask |= FS_DN_RENAME; |
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if (isdir) { |
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old_dir_mask |= FS_ISDIR; |
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new_dir_mask |= FS_ISDIR; |
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} |
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fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name, |
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fs_cookie); |
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fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name, |
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fs_cookie); |
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if (target) |
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fsnotify_link_count(target); |
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if (source) |
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fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
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audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE); |
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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_vfsmount_delete - a vfsmount is being destroyed, clean up is needed |
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*/ |
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static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt) |
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{ |
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__fsnotify_vfsmount_delete(mnt); |
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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_ISDIR; |
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fsnotify_parent(NULL, dentry, mask); |
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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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fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
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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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audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
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fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
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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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fsnotify_link_count(inode); |
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audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE); |
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fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); |
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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_ISDIR); |
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struct inode *d_inode = dentry->d_inode; |
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audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE); |
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fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); |
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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 file *file) |
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{ |
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struct path *path = &file->f_path; |
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struct inode *inode = file_inode(file); |
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__u32 mask = FS_ACCESS; |
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if (S_ISDIR(inode->i_mode)) |
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mask |= FS_ISDIR; |
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if (!(file->f_mode & FMODE_NONOTIFY)) { |
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fsnotify_parent(path, NULL, mask); |
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
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} |
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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 file *file) |
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{ |
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struct path *path = &file->f_path; |
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struct inode *inode = file_inode(file); |
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__u32 mask = FS_MODIFY; |
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if (S_ISDIR(inode->i_mode)) |
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mask |= FS_ISDIR; |
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if (!(file->f_mode & FMODE_NONOTIFY)) { |
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fsnotify_parent(path, NULL, mask); |
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
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} |
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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 file *file) |
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{ |
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struct path *path = &file->f_path; |
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struct inode *inode = file_inode(file); |
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__u32 mask = FS_OPEN; |
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if (S_ISDIR(inode->i_mode)) |
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mask |= FS_ISDIR; |
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fsnotify_parent(path, NULL, mask); |
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
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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 path *path = &file->f_path; |
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struct inode *inode = file_inode(file); |
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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_ISDIR; |
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if (!(file->f_mode & FMODE_NONOTIFY)) { |
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fsnotify_parent(path, NULL, mask); |
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fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); |
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} |
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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_ISDIR; |
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fsnotify_parent(NULL, dentry, mask); |
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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
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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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__u32 mask = 0; |
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if (ia_valid & ATTR_UID) |
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mask |= FS_ATTRIB; |
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if (ia_valid & ATTR_GID) |
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mask |= FS_ATTRIB; |
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if (ia_valid & ATTR_SIZE) |
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mask |= FS_MODIFY; |
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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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mask |= FS_ATTRIB; |
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else if (ia_valid & ATTR_ATIME) |
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mask |= FS_ACCESS; |
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else if (ia_valid & ATTR_MTIME) |
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mask |= FS_MODIFY; |
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if (ia_valid & ATTR_MODE) |
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mask |= FS_ATTRIB; |
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if (mask) { |
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if (S_ISDIR(inode->i_mode)) |
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mask |= FS_ISDIR; |
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fsnotify_parent(NULL, dentry, mask); |
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fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); |
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} |
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} |
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#endif /* _LINUX_FS_NOTIFY_H */
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