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Merge updates from Andrew Morton: - a few misc things - a few Y2038 fixes - ntfs fixes - arch/sh tweaks - ocfs2 updates - most of MM * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (111 commits) mm/hmm.c: remove unused variables align_start and align_end fs/userfaultfd.c: remove redundant pointer uwq mm, vmacache: hash addresses based on pmd mm/list_lru: introduce list_lru_shrink_walk_irq() mm/list_lru.c: pass struct list_lru_node* as an argument to __list_lru_walk_one() mm/list_lru.c: move locking from __list_lru_walk_one() to its caller mm/list_lru.c: use list_lru_walk_one() in list_lru_walk_node() mm, swap: make CONFIG_THP_SWAP depend on CONFIG_SWAP mm/sparse: delete old sparse_init and enable new one mm/sparse: add new sparse_init_nid() and sparse_init() mm/sparse: move buffer init/fini to the common place mm/sparse: use the new sparse buffer functions in non-vmemmap mm/sparse: abstract sparse buffer allocations mm/hugetlb.c: don't zero 1GiB bootmem pages mm, page_alloc: double zone's batchsize mm/oom_kill.c: document oom_lock mm/hugetlb: remove gigantic page support for HIGHMEM mm, oom: remove sleep from under oom_lock kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous() mm/cma: remove unsupported gfp_mask parameter from cma_alloc() ...
502 lines
19 KiB
C
502 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Filesystem access notification for Linux
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*
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* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
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*/
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#ifndef __LINUX_FSNOTIFY_BACKEND_H
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#define __LINUX_FSNOTIFY_BACKEND_H
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#ifdef __KERNEL__
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#include <linux/idr.h> /* inotify uses this */
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#include <linux/fs.h> /* struct inode */
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#include <linux/list.h>
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#include <linux/path.h> /* struct path */
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/atomic.h>
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#include <linux/user_namespace.h>
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#include <linux/refcount.h>
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/*
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* IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
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* convert between them. dnotify only needs conversion at watch creation
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* so no perf loss there. fanotify isn't defined yet, so it can use the
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* wholes if it needs more events.
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*/
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#define FS_ACCESS 0x00000001 /* File was accessed */
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#define FS_MODIFY 0x00000002 /* File was modified */
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#define FS_ATTRIB 0x00000004 /* Metadata changed */
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#define FS_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
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#define FS_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
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#define FS_OPEN 0x00000020 /* File was opened */
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#define FS_MOVED_FROM 0x00000040 /* File was moved from X */
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#define FS_MOVED_TO 0x00000080 /* File was moved to Y */
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#define FS_CREATE 0x00000100 /* Subfile was created */
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#define FS_DELETE 0x00000200 /* Subfile was deleted */
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#define FS_DELETE_SELF 0x00000400 /* Self was deleted */
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#define FS_MOVE_SELF 0x00000800 /* Self was moved */
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#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
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#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
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#define FS_IN_IGNORED 0x00008000 /* last inotify event here */
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#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
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#define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
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#define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
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#define FS_ISDIR 0x40000000 /* event occurred against dir */
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#define FS_IN_ONESHOT 0x80000000 /* only send event once */
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#define FS_DN_RENAME 0x10000000 /* file renamed */
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#define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
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/* This inode cares about things that happen to its children. Always set for
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* dnotify and inotify. */
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#define FS_EVENT_ON_CHILD 0x08000000
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/* This is a list of all events that may get sent to a parernt based on fs event
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* happening to inodes inside that directory */
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#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
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FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
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FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
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FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
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#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
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#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
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#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
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FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
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FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
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FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
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FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
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FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \
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FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \
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FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
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struct fsnotify_group;
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struct fsnotify_event;
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struct fsnotify_mark;
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struct fsnotify_event_private_data;
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struct fsnotify_fname;
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struct fsnotify_iter_info;
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struct mem_cgroup;
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/*
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* Each group much define these ops. The fsnotify infrastructure will call
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* these operations for each relevant group.
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*
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* handle_event - main call for a group to handle an fs event
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* free_group_priv - called when a group refcnt hits 0 to clean up the private union
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* freeing_mark - called when a mark is being destroyed for some reason. The group
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* MUST be holding a reference on each mark and that reference must be
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* dropped in this function. inotify uses this function to send
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* userspace messages that marks have been removed.
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*/
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struct fsnotify_ops {
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int (*handle_event)(struct fsnotify_group *group,
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struct inode *inode,
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u32 mask, const void *data, int data_type,
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const unsigned char *file_name, u32 cookie,
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struct fsnotify_iter_info *iter_info);
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void (*free_group_priv)(struct fsnotify_group *group);
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void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
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void (*free_event)(struct fsnotify_event *event);
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/* called on final put+free to free memory */
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void (*free_mark)(struct fsnotify_mark *mark);
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};
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/*
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* all of the information about the original object we want to now send to
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* a group. If you want to carry more info from the accessing task to the
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* listener this structure is where you need to be adding fields.
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*/
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struct fsnotify_event {
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struct list_head list;
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/* inode may ONLY be dereferenced during handle_event(). */
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struct inode *inode; /* either the inode the event happened to or its parent */
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u32 mask; /* the type of access, bitwise OR for FS_* event types */
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};
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/*
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* A group is a "thing" that wants to receive notification about filesystem
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* events. The mask holds the subset of event types this group cares about.
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* refcnt on a group is up to the implementor and at any moment if it goes 0
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* everything will be cleaned up.
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*/
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struct fsnotify_group {
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const struct fsnotify_ops *ops; /* how this group handles things */
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/*
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* How the refcnt is used is up to each group. When the refcnt hits 0
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* fsnotify will clean up all of the resources associated with this group.
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* As an example, the dnotify group will always have a refcnt=1 and that
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* will never change. Inotify, on the other hand, has a group per
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* inotify_init() and the refcnt will hit 0 only when that fd has been
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* closed.
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*/
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refcount_t refcnt; /* things with interest in this group */
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/* needed to send notification to userspace */
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spinlock_t notification_lock; /* protect the notification_list */
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struct list_head notification_list; /* list of event_holder this group needs to send to userspace */
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wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
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unsigned int q_len; /* events on the queue */
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unsigned int max_events; /* maximum events allowed on the list */
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/*
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* Valid fsnotify group priorities. Events are send in order from highest
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* priority to lowest priority. We default to the lowest priority.
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*/
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#define FS_PRIO_0 0 /* normal notifiers, no permissions */
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#define FS_PRIO_1 1 /* fanotify content based access control */
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#define FS_PRIO_2 2 /* fanotify pre-content access */
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unsigned int priority;
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bool shutdown; /* group is being shut down, don't queue more events */
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/* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
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struct mutex mark_mutex; /* protect marks_list */
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atomic_t num_marks; /* 1 for each mark and 1 for not being
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* past the point of no return when freeing
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* a group */
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atomic_t user_waits; /* Number of tasks waiting for user
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* response */
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struct list_head marks_list; /* all inode marks for this group */
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struct fasync_struct *fsn_fa; /* async notification */
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struct fsnotify_event *overflow_event; /* Event we queue when the
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* notification list is too
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* full */
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struct mem_cgroup *memcg; /* memcg to charge allocations */
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/* groups can define private fields here or use the void *private */
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union {
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void *private;
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#ifdef CONFIG_INOTIFY_USER
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struct inotify_group_private_data {
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spinlock_t idr_lock;
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struct idr idr;
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struct ucounts *ucounts;
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} inotify_data;
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#endif
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#ifdef CONFIG_FANOTIFY
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struct fanotify_group_private_data {
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/* allows a group to block waiting for a userspace response */
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struct list_head access_list;
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wait_queue_head_t access_waitq;
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int f_flags;
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unsigned int max_marks;
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struct user_struct *user;
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bool audit;
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} fanotify_data;
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#endif /* CONFIG_FANOTIFY */
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};
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};
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/* when calling fsnotify tell it if the data is a path or inode */
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#define FSNOTIFY_EVENT_NONE 0
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#define FSNOTIFY_EVENT_PATH 1
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#define FSNOTIFY_EVENT_INODE 2
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enum fsnotify_obj_type {
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FSNOTIFY_OBJ_TYPE_INODE,
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FSNOTIFY_OBJ_TYPE_VFSMOUNT,
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FSNOTIFY_OBJ_TYPE_COUNT,
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FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
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};
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#define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE)
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#define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
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#define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
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static inline bool fsnotify_valid_obj_type(unsigned int type)
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{
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return (type < FSNOTIFY_OBJ_TYPE_COUNT);
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}
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struct fsnotify_iter_info {
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struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
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unsigned int report_mask;
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int srcu_idx;
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};
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static inline bool fsnotify_iter_should_report_type(
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struct fsnotify_iter_info *iter_info, int type)
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{
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return (iter_info->report_mask & (1U << type));
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}
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static inline void fsnotify_iter_set_report_type(
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struct fsnotify_iter_info *iter_info, int type)
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{
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iter_info->report_mask |= (1U << type);
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}
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static inline void fsnotify_iter_set_report_type_mark(
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struct fsnotify_iter_info *iter_info, int type,
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struct fsnotify_mark *mark)
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{
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iter_info->marks[type] = mark;
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iter_info->report_mask |= (1U << type);
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}
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#define FSNOTIFY_ITER_FUNCS(name, NAME) \
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static inline struct fsnotify_mark *fsnotify_iter_##name##_mark( \
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struct fsnotify_iter_info *iter_info) \
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{ \
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return (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_##NAME##_FL) ? \
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iter_info->marks[FSNOTIFY_OBJ_TYPE_##NAME] : NULL; \
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}
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FSNOTIFY_ITER_FUNCS(inode, INODE)
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FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
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#define fsnotify_foreach_obj_type(type) \
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for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
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/*
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* fsnotify_connp_t is what we embed in objects which connector can be attached
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* to. fsnotify_connp_t * is how we refer from connector back to object.
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*/
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struct fsnotify_mark_connector;
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typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
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/*
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* Inode / vfsmount point to this structure which tracks all marks attached to
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* the inode / vfsmount. The reference to inode / vfsmount is held by this
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* structure. We destroy this structure when there are no more marks attached
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* to it. The structure is protected by fsnotify_mark_srcu.
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*/
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struct fsnotify_mark_connector {
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spinlock_t lock;
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unsigned int type; /* Type of object [lock] */
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union {
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/* Object pointer [lock] */
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fsnotify_connp_t *obj;
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/* Used listing heads to free after srcu period expires */
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struct fsnotify_mark_connector *destroy_next;
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};
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struct hlist_head list;
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};
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/*
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* A mark is simply an object attached to an in core inode which allows an
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* fsnotify listener to indicate they are either no longer interested in events
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* of a type matching mask or only interested in those events.
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*
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* These are flushed when an inode is evicted from core and may be flushed
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* when the inode is modified (as seen by fsnotify_access). Some fsnotify
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* users (such as dnotify) will flush these when the open fd is closed and not
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* at inode eviction or modification.
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*
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* Text in brackets is showing the lock(s) protecting modifications of a
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* particular entry. obj_lock means either inode->i_lock or
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* mnt->mnt_root->d_lock depending on the mark type.
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*/
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struct fsnotify_mark {
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/* Mask this mark is for [mark->lock, group->mark_mutex] */
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__u32 mask;
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/* We hold one for presence in g_list. Also one ref for each 'thing'
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* in kernel that found and may be using this mark. */
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refcount_t refcnt;
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/* Group this mark is for. Set on mark creation, stable until last ref
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* is dropped */
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struct fsnotify_group *group;
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/* List of marks by group->marks_list. Also reused for queueing
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* mark into destroy_list when it's waiting for the end of SRCU period
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* before it can be freed. [group->mark_mutex] */
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struct list_head g_list;
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/* Protects inode / mnt pointers, flags, masks */
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spinlock_t lock;
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/* List of marks for inode / vfsmount [connector->lock, mark ref] */
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struct hlist_node obj_list;
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/* Head of list of marks for an object [mark ref] */
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struct fsnotify_mark_connector *connector;
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/* Events types to ignore [mark->lock, group->mark_mutex] */
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__u32 ignored_mask;
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#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
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#define FSNOTIFY_MARK_FLAG_ALIVE 0x02
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#define FSNOTIFY_MARK_FLAG_ATTACHED 0x04
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unsigned int flags; /* flags [mark->lock] */
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};
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#ifdef CONFIG_FSNOTIFY
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/* called from the vfs helpers */
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/* main fsnotify call to send events */
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extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
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const unsigned char *name, u32 cookie);
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extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
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extern void __fsnotify_inode_delete(struct inode *inode);
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extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
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extern u32 fsnotify_get_cookie(void);
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static inline int fsnotify_inode_watches_children(struct inode *inode)
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{
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/* FS_EVENT_ON_CHILD is set if the inode may care */
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if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))
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return 0;
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/* this inode might care about child events, does it care about the
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* specific set of events that can happen on a child? */
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return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
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}
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/*
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* Update the dentry with a flag indicating the interest of its parent to receive
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* filesystem events when those events happens to this dentry->d_inode.
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*/
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static inline void fsnotify_update_flags(struct dentry *dentry)
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{
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assert_spin_locked(&dentry->d_lock);
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/*
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* Serialisation of setting PARENT_WATCHED on the dentries is provided
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* by d_lock. If inotify_inode_watched changes after we have taken
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* d_lock, the following __fsnotify_update_child_dentry_flags call will
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* find our entry, so it will spin until we complete here, and update
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* us with the new state.
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*/
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if (fsnotify_inode_watches_children(dentry->d_parent->d_inode))
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dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
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else
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dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
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}
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/* called from fsnotify listeners, such as fanotify or dnotify */
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/* create a new group */
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extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
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/* get reference to a group */
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extern void fsnotify_get_group(struct fsnotify_group *group);
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/* drop reference on a group from fsnotify_alloc_group */
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extern void fsnotify_put_group(struct fsnotify_group *group);
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/* group destruction begins, stop queuing new events */
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extern void fsnotify_group_stop_queueing(struct fsnotify_group *group);
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/* destroy group */
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extern void fsnotify_destroy_group(struct fsnotify_group *group);
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/* fasync handler function */
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extern int fsnotify_fasync(int fd, struct file *file, int on);
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/* Free event from memory */
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extern void fsnotify_destroy_event(struct fsnotify_group *group,
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struct fsnotify_event *event);
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/* attach the event to the group notification queue */
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extern int fsnotify_add_event(struct fsnotify_group *group,
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struct fsnotify_event *event,
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int (*merge)(struct list_head *,
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struct fsnotify_event *));
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/* Queue overflow event to a notification group */
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static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
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{
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fsnotify_add_event(group, group->overflow_event, NULL);
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}
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/* true if the group notification queue is empty */
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extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
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/* return, but do not dequeue the first event on the notification queue */
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extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
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/* return AND dequeue the first event on the notification queue */
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extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
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/* functions used to manipulate the marks attached to inodes */
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/* Get mask of events for a list of marks */
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extern __u32 fsnotify_conn_mask(struct fsnotify_mark_connector *conn);
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/* Calculate mask of events for a list of marks */
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extern void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
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extern void fsnotify_init_mark(struct fsnotify_mark *mark,
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struct fsnotify_group *group);
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/* Find mark belonging to given group in the list of marks */
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extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
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struct fsnotify_group *group);
|
|
/* attach the mark to the object */
|
|
extern int fsnotify_add_mark(struct fsnotify_mark *mark,
|
|
fsnotify_connp_t *connp, unsigned int type,
|
|
int allow_dups);
|
|
extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
|
|
fsnotify_connp_t *connp, unsigned int type,
|
|
int allow_dups);
|
|
/* attach the mark to the inode */
|
|
static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
|
|
struct inode *inode,
|
|
int allow_dups)
|
|
{
|
|
return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
|
|
FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
|
|
}
|
|
static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
|
|
struct inode *inode,
|
|
int allow_dups)
|
|
{
|
|
return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
|
|
FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
|
|
}
|
|
/* given a group and a mark, flag mark to be freed when all references are dropped */
|
|
extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
|
|
struct fsnotify_group *group);
|
|
/* detach mark from inode / mount list, group list, drop inode reference */
|
|
extern void fsnotify_detach_mark(struct fsnotify_mark *mark);
|
|
/* free mark */
|
|
extern void fsnotify_free_mark(struct fsnotify_mark *mark);
|
|
/* run all the marks in a group, and clear all of the marks attached to given object type */
|
|
extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned int type);
|
|
/* run all the marks in a group, and clear all of the vfsmount marks */
|
|
static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
|
|
{
|
|
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
|
|
}
|
|
/* run all the marks in a group, and clear all of the inode marks */
|
|
static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
|
|
{
|
|
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
|
|
}
|
|
extern void fsnotify_get_mark(struct fsnotify_mark *mark);
|
|
extern void fsnotify_put_mark(struct fsnotify_mark *mark);
|
|
extern void fsnotify_unmount_inodes(struct super_block *sb);
|
|
extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
|
|
extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
|
|
|
|
/* put here because inotify does some weird stuff when destroying watches */
|
|
extern void fsnotify_init_event(struct fsnotify_event *event,
|
|
struct inode *to_tell, u32 mask);
|
|
|
|
#else
|
|
|
|
static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
|
|
const unsigned char *name, u32 cookie)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void __fsnotify_inode_delete(struct inode *inode)
|
|
{}
|
|
|
|
static inline void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
|
|
{}
|
|
|
|
static inline void fsnotify_update_flags(struct dentry *dentry)
|
|
{}
|
|
|
|
static inline u32 fsnotify_get_cookie(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void fsnotify_unmount_inodes(struct super_block *sb)
|
|
{}
|
|
|
|
#endif /* CONFIG_FSNOTIFY */
|
|
|
|
#endif /* __KERNEL __ */
|
|
|
|
#endif /* __LINUX_FSNOTIFY_BACKEND_H */
|