diff options
Diffstat (limited to 'fs/notify/fsnotify.c')
-rw-r--r-- | fs/notify/fsnotify.c | 167 |
1 files changed, 97 insertions, 70 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 4034ca566f95..7974e91ffe13 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -70,8 +70,7 @@ static void fsnotify_unmount_inodes(struct super_block *sb) spin_unlock(&inode->i_lock); spin_unlock(&sb->s_inode_list_lock); - if (iput_inode) - iput(iput_inode); + iput(iput_inode); /* for each watch, send FS_UNMOUNT and then remove it */ fsnotify_inode(inode, FS_UNMOUNT); @@ -85,8 +84,7 @@ static void fsnotify_unmount_inodes(struct super_block *sb) } spin_unlock(&sb->s_inode_list_lock); - if (iput_inode) - iput(iput_inode); + iput(iput_inode); } void fsnotify_sb_delete(struct super_block *sb) @@ -102,7 +100,7 @@ void fsnotify_sb_delete(struct super_block *sb) * Given an inode, first check if we care what happens to our children. Inotify * and dnotify both tell their parents about events. If we care about any event * on a child we run all of our children and set a dentry flag saying that the - * parent cares. Thus when an event happens on a child it can quickly tell if + * parent cares. Thus when an event happens on a child it can quickly tell * if there is a need to find a parent and send the event to the parent. */ void __fsnotify_update_child_dentry_flags(struct inode *inode) @@ -255,7 +253,7 @@ static int fsnotify_handle_inode_event(struct fsnotify_group *group, if (WARN_ON_ONCE(!inode && !dir)) return 0; - if ((inode_mark->mask & FS_EXCL_UNLINK) && + if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) && path && d_unlinked(path->dentry)) return 0; @@ -279,23 +277,28 @@ static int fsnotify_handle_event(struct fsnotify_group *group, __u32 mask, WARN_ON_ONCE(fsnotify_iter_vfsmount_mark(iter_info))) return 0; - if (parent_mark) { - /* - * parent_mark indicates that the parent inode is watching - * children and interested in this event, which is an event - * possible on child. But is *this mark* watching children and - * interested in this event? - */ - if (parent_mark->mask & FS_EVENT_ON_CHILD) { - ret = fsnotify_handle_inode_event(group, parent_mark, mask, - data, data_type, dir, name, 0); - if (ret) - return ret; - } - if (!inode_mark) + /* + * For FS_RENAME, 'dir' is old dir and 'data' is new dentry. + * The only ->handle_inode_event() backend that supports FS_RENAME is + * dnotify, where it means file was renamed within same parent. + */ + if (mask & FS_RENAME) { + struct dentry *moved = fsnotify_data_dentry(data, data_type); + + if (dir != moved->d_parent->d_inode) return 0; } + if (parent_mark) { + ret = fsnotify_handle_inode_event(group, parent_mark, mask, + data, data_type, dir, name, 0); + if (ret) + return ret; + } + + if (!inode_mark) + return 0; + if (mask & FS_EVENT_ON_CHILD) { /* * Some events can be sent on both parent dir and child marks @@ -321,42 +324,36 @@ static int send_to_group(__u32 mask, const void *data, int data_type, struct fsnotify_group *group = NULL; __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); __u32 marks_mask = 0; - __u32 marks_ignored_mask = 0; + __u32 marks_ignore_mask = 0; + bool is_dir = mask & FS_ISDIR; struct fsnotify_mark *mark; int type; - if (WARN_ON(!iter_info->report_mask)) + if (!iter_info->report_mask) return 0; /* clear ignored on inode modification */ if (mask & FS_MODIFY) { - fsnotify_foreach_obj_type(type) { - if (!fsnotify_iter_should_report_type(iter_info, type)) - continue; - mark = iter_info->marks[type]; - if (mark && - !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) - mark->ignored_mask = 0; + fsnotify_foreach_iter_mark_type(iter_info, mark, type) { + if (!(mark->flags & + FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) + mark->ignore_mask = 0; } } - fsnotify_foreach_obj_type(type) { - if (!fsnotify_iter_should_report_type(iter_info, type)) - continue; - mark = iter_info->marks[type]; - /* does the object mark tell us to do something? */ - if (mark) { - group = mark->group; - marks_mask |= mark->mask; - marks_ignored_mask |= mark->ignored_mask; - } + /* Are any of the group marks interested in this event? */ + fsnotify_foreach_iter_mark_type(iter_info, mark, type) { + group = mark->group; + marks_mask |= mark->mask; + marks_ignore_mask |= + fsnotify_effective_ignore_mask(mark, is_dir, type); } - pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignored_mask=%x data=%p data_type=%d dir=%p cookie=%d\n", - __func__, group, mask, marks_mask, marks_ignored_mask, + pr_debug("%s: group=%p mask=%x marks_mask=%x marks_ignore_mask=%x data=%p data_type=%d dir=%p cookie=%d\n", + __func__, group, mask, marks_mask, marks_ignore_mask, data, data_type, dir, cookie); - if (!(test_mask & marks_mask & ~marks_ignored_mask)) + if (!(test_mask & marks_mask & ~marks_ignore_mask)) return 0; if (group->ops->handle_event) { @@ -393,11 +390,11 @@ static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark) /* * iter_info is a multi head priority queue of marks. - * Pick a subset of marks from queue heads, all with the - * same group and set the report_mask for selected subset. - * Returns the report_mask of the selected subset. + * Pick a subset of marks from queue heads, all with the same group + * and set the report_mask to a subset of the selected marks. + * Returns false if there are no more groups to iterate. */ -static unsigned int fsnotify_iter_select_report_types( +static bool fsnotify_iter_select_report_types( struct fsnotify_iter_info *iter_info) { struct fsnotify_group *max_prio_group = NULL; @@ -405,7 +402,7 @@ static unsigned int fsnotify_iter_select_report_types( int type; /* Choose max prio group among groups of all queue heads */ - fsnotify_foreach_obj_type(type) { + fsnotify_foreach_iter_type(type) { mark = iter_info->marks[type]; if (mark && fsnotify_compare_groups(max_prio_group, mark->group) > 0) @@ -413,30 +410,49 @@ static unsigned int fsnotify_iter_select_report_types( } if (!max_prio_group) - return 0; + return false; /* Set the report mask for marks from same group as max prio group */ + iter_info->current_group = max_prio_group; iter_info->report_mask = 0; - fsnotify_foreach_obj_type(type) { + fsnotify_foreach_iter_type(type) { mark = iter_info->marks[type]; - if (mark && - fsnotify_compare_groups(max_prio_group, mark->group) == 0) + if (mark && mark->group == iter_info->current_group) { + /* + * FSNOTIFY_ITER_TYPE_PARENT indicates that this inode + * is watching children and interested in this event, + * which is an event possible on child. + * But is *this mark* watching children? + */ + if (type == FSNOTIFY_ITER_TYPE_PARENT && + !(mark->mask & FS_EVENT_ON_CHILD) && + !(fsnotify_ignore_mask(mark) & FS_EVENT_ON_CHILD)) + continue; + fsnotify_iter_set_report_type(iter_info, type); + } } - return iter_info->report_mask; + return true; } /* - * Pop from iter_info multi head queue, the marks that were iterated in the + * Pop from iter_info multi head queue, the marks that belong to the group of * current iteration step. */ static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info) { + struct fsnotify_mark *mark; int type; - fsnotify_foreach_obj_type(type) { - if (fsnotify_iter_should_report_type(iter_info, type)) + /* + * We cannot use fsnotify_foreach_iter_mark_type() here because we + * may need to advance a mark of type X that belongs to current_group + * but was not selected for reporting. + */ + fsnotify_foreach_iter_type(type) { + mark = iter_info->marks[type]; + if (mark && mark->group == iter_info->current_group) iter_info->marks[type] = fsnotify_next_mark(iter_info->marks[type]); } @@ -469,7 +485,9 @@ int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir, struct super_block *sb = fsnotify_data_sb(data, data_type); struct fsnotify_iter_info iter_info = {}; struct mount *mnt = NULL; - struct inode *parent = NULL; + struct inode *inode2 = NULL; + struct dentry *moved; + int inode2_type; int ret = 0; __u32 test_mask, marks_mask; @@ -479,12 +497,19 @@ int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir, if (!inode) { /* Dirent event - report on TYPE_INODE to dir */ inode = dir; + /* For FS_RENAME, inode is old_dir and inode2 is new_dir */ + if (mask & FS_RENAME) { + moved = fsnotify_data_dentry(data, data_type); + inode2 = moved->d_parent->d_inode; + inode2_type = FSNOTIFY_ITER_TYPE_INODE2; + } } else if (mask & FS_EVENT_ON_CHILD) { /* * Event on child - report on TYPE_PARENT to dir if it is * watching children and on TYPE_INODE to child. */ - parent = dir; + inode2 = dir; + inode2_type = FSNOTIFY_ITER_TYPE_PARENT; } /* @@ -497,7 +522,7 @@ int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir, if (!sb->s_fsnotify_marks && (!mnt || !mnt->mnt_fsnotify_marks) && (!inode || !inode->i_fsnotify_marks) && - (!parent || !parent->i_fsnotify_marks)) + (!inode2 || !inode2->i_fsnotify_marks)) return 0; marks_mask = sb->s_fsnotify_mask; @@ -505,33 +530,35 @@ int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir, marks_mask |= mnt->mnt_fsnotify_mask; if (inode) marks_mask |= inode->i_fsnotify_mask; - if (parent) - marks_mask |= parent->i_fsnotify_mask; + if (inode2) + marks_mask |= inode2->i_fsnotify_mask; /* - * if this is a modify event we may need to clear the ignored masks - * otherwise return if none of the marks care about this type of event. + * If this is a modify event we may need to clear some ignore masks. + * In that case, the object with ignore masks will have the FS_MODIFY + * event in its mask. + * Otherwise, return if none of the marks care about this type of event. */ test_mask = (mask & ALL_FSNOTIFY_EVENTS); - if (!(mask & FS_MODIFY) && !(test_mask & marks_mask)) + if (!(test_mask & marks_mask)) return 0; iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu); - iter_info.marks[FSNOTIFY_OBJ_TYPE_SB] = + iter_info.marks[FSNOTIFY_ITER_TYPE_SB] = fsnotify_first_mark(&sb->s_fsnotify_marks); if (mnt) { - iter_info.marks[FSNOTIFY_OBJ_TYPE_VFSMOUNT] = + iter_info.marks[FSNOTIFY_ITER_TYPE_VFSMOUNT] = fsnotify_first_mark(&mnt->mnt_fsnotify_marks); } if (inode) { - iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] = + iter_info.marks[FSNOTIFY_ITER_TYPE_INODE] = fsnotify_first_mark(&inode->i_fsnotify_marks); } - if (parent) { - iter_info.marks[FSNOTIFY_OBJ_TYPE_PARENT] = - fsnotify_first_mark(&parent->i_fsnotify_marks); + if (inode2) { + iter_info.marks[inode2_type] = + fsnotify_first_mark(&inode2->i_fsnotify_marks); } /* @@ -560,7 +587,7 @@ static __init int fsnotify_init(void) { int ret; - BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25); + BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23); ret = init_srcu_struct(&fsnotify_mark_srcu); if (ret) |