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Merge tag 'fsnotify_for_v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull fanotify updates from Jan Kara:
 "Support for fanotify directory events and changes to make waiting for
  fanotify permission event response killable"

* tag 'fsnotify_for_v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (25 commits)
  fanotify: Make waits for fanotify events only killable
  fanotify: Use interruptible wait when waiting for permission events
  fanotify: Track permission event state
  fanotify: Simplify cleaning of access_list
  fsnotify: Create function to remove event from notification list
  fanotify: Move locking inside get_one_event()
  fanotify: Fold dequeue_event() into process_access_response()
  fanotify: Select EXPORTFS
  fanotify: report FAN_ONDIR to listener with FAN_REPORT_FID
  fanotify: add support for create/attrib/move/delete events
  fanotify: support events with data type FSNOTIFY_EVENT_INODE
  fanotify: check FS_ISDIR flag instead of d_is_dir()
  fsnotify: report FS_ISDIR flag with MOVE_SELF and DELETE_SELF events
  fanotify: use vfs_get_fsid() helper instead of vfs_statfs()
  vfs: add vfs_get_fsid() helper
  fanotify: cache fsid in fsnotify_mark_connector
  fanotify: enable FAN_REPORT_FID init flag
  fanotify: copy event fid info to user
  fanotify: encode file identifier for FAN_REPORT_FID
  fanotify: open code fill_event_metadata()
  ...
This commit is contained in:
Linus Torvalds 2019-03-07 09:03:38 -08:00
parent a9913f23f3 b519057981
commit 0556161ff9
16 changed files with 826 additions and 262 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/notify/fanotify/Kconfig
View File

@ -2,6 +2,7 @@ config FANOTIFY
bool "Filesystem wide access notification"
select FSNOTIFY
select ANON_INODES
select EXPORTFS
default n
---help---
Say Y here to enable fanotify support. fanotify is a file access

267
fs/notify/fanotify/fanotify.c
View File

@ -13,22 +13,40 @@
#include <linux/wait.h>
#include <linux/audit.h>
#include <linux/sched/mm.h>
#include <linux/statfs.h>
#include "fanotify.h"
static bool should_merge(struct fsnotify_event *old_fsn,
struct fsnotify_event *new_fsn)
{
struct fanotify_event_info *old, *new;
struct fanotify_event *old, *new;
pr_debug("%s: old=%p new=%p\n", __func__, old_fsn, new_fsn);
old = FANOTIFY_E(old_fsn);
new = FANOTIFY_E(new_fsn);
if (old_fsn->inode == new_fsn->inode && old->pid == new->pid &&
old->path.mnt == new->path.mnt &&
old->path.dentry == new->path.dentry)
return true;
if (old_fsn->inode != new_fsn->inode || old->pid != new->pid ||
old->fh_type != new->fh_type || old->fh_len != new->fh_len)
return false;
if (fanotify_event_has_path(old)) {
return old->path.mnt == new->path.mnt &&
old->path.dentry == new->path.dentry;
} else if (fanotify_event_has_fid(old)) {
/*
* We want to merge many dirent events in the same dir (i.e.
* creates/unlinks/renames), but we do not want to merge dirent
* events referring to subdirs with dirent events referring to
* non subdirs, otherwise, user won't be able to tell from a
* mask FAN_CREATE|FAN_DELETE|FAN_ONDIR if it describes mkdir+
* unlink pair or rmdir+create pair of events.
*/
return (old->mask & FS_ISDIR) == (new->mask & FS_ISDIR) &&
fanotify_fid_equal(&old->fid, &new->fid, old->fh_len);
}
/* Do not merge events if we failed to encode fid */
return false;
}
@ -36,20 +54,22 @@ static bool should_merge(struct fsnotify_event *old_fsn,
static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
{
struct fsnotify_event *test_event;
struct fanotify_event *new;
pr_debug("%s: list=%p event=%p\n", __func__, list, event);
new = FANOTIFY_E(event);
/*
* Don't merge a permission event with any other event so that we know
* the event structure we have created in fanotify_handle_event() is the
* one we should check for permission response.
*/
if (fanotify_is_perm_event(event->mask))
if (fanotify_is_perm_event(new->mask))
return 0;
list_for_each_entry_reverse(test_event, list, list) {
if (should_merge(test_event, event)) {
test_event->mask |= event->mask;
FANOTIFY_E(test_event)->mask |= new->mask;
return 1;
}
}
@ -57,15 +77,44 @@ static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
return 0;
}
/*
* Wait for response to permission event. The function also takes care of
* freeing the permission event (or offloads that in case the wait is canceled
* by a signal). The function returns 0 in case access got allowed by userspace,
* -EPERM in case userspace disallowed the access, and -ERESTARTSYS in case
* the wait got interrupted by a signal.
*/
static int fanotify_get_response(struct fsnotify_group *group,
struct fanotify_perm_event_info *event,
struct fanotify_perm_event *event,
struct fsnotify_iter_info *iter_info)
{
int ret;
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
wait_event(group->fanotify_data.access_waitq, event->response);
ret = wait_event_killable(group->fanotify_data.access_waitq,
event->state == FAN_EVENT_ANSWERED);
/* Signal pending? */
if (ret < 0) {
spin_lock(&group->notification_lock);
/* Event reported to userspace and no answer yet? */
if (event->state == FAN_EVENT_REPORTED) {
/* Event will get freed once userspace answers to it */
event->state = FAN_EVENT_CANCELED;
spin_unlock(&group->notification_lock);
return ret;
}
/* Event not yet reported? Just remove it. */
if (event->state == FAN_EVENT_INIT)
fsnotify_remove_queued_event(group, &event->fae.fse);
/*
* Event may be also answered in case signal delivery raced
* with wakeup. In that case we have nothing to do besides
* freeing the event and reporting error.
*/
spin_unlock(&group->notification_lock);
goto out;
}
/* userspace responded, convert to something usable */
switch (event->response & ~FAN_AUDIT) {
@ -81,11 +130,11 @@ static int fanotify_get_response(struct fsnotify_group *group,
if (event->response & FAN_AUDIT)
audit_fanotify(event->response & ~FAN_AUDIT);
event->response = 0;
pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__,
group, event, ret);
out:
fsnotify_destroy_event(group, &event->fae.fse);
return ret;
}
@ -95,11 +144,13 @@ static int fanotify_get_response(struct fsnotify_group *group,
* been included within the event mask, but have not been explicitly
* requested by the user, will not be present in the returned mask.
*/
static u32 fanotify_group_event_mask(struct fsnotify_iter_info *iter_info,
u32 event_mask, const void *data,
int data_type)
static u32 fanotify_group_event_mask(struct fsnotify_group *group,
struct fsnotify_iter_info *iter_info,
u32 event_mask, const void *data,
int data_type)
{
__u32 marks_mask = 0, marks_ignored_mask = 0;
__u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS;
const struct path *path = data;
struct fsnotify_mark *mark;
int type;
@ -107,14 +158,14 @@ static u32 fanotify_group_event_mask(struct fsnotify_iter_info *iter_info,
pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
__func__, iter_info->report_mask, event_mask, data, data_type);
/* If we don't have enough info to send an event to userspace say no */
if (data_type != FSNOTIFY_EVENT_PATH)
return 0;
/* Sorry, fanotify only gives a damn about files and dirs */
if (!d_is_reg(path->dentry) &&
!d_can_lookup(path->dentry))
return 0;
if (!FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
/* Do we have path to open a file descriptor? */
if (data_type != FSNOTIFY_EVENT_PATH)
return 0;
/* Path type events are only relevant for files and dirs */
if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
return 0;
}
fsnotify_foreach_obj_type(type) {
if (!fsnotify_iter_should_report_type(iter_info, type))
@ -133,20 +184,106 @@ static u32 fanotify_group_event_mask(struct fsnotify_iter_info *iter_info,
marks_ignored_mask |= mark->ignored_mask;
}
if (d_is_dir(path->dentry) &&
test_mask = event_mask & marks_mask & ~marks_ignored_mask;
/*
* dirent modification events (create/delete/move) do not carry the
* child entry name/inode information. Instead, we report FAN_ONDIR
* for mkdir/rmdir so user can differentiate them from creat/unlink.
*
* For backward compatibility and consistency, do not report FAN_ONDIR
* to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
* to user in FAN_REPORT_FID mode for all event types.
*/
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
/* Do not report FAN_ONDIR without any event */
if (!(test_mask & ~FAN_ONDIR))
return 0;
} else {
user_mask &= ~FAN_ONDIR;
}
if (event_mask & FS_ISDIR &&
!(marks_mask & FS_ISDIR & ~marks_ignored_mask))
return 0;
return event_mask & FANOTIFY_OUTGOING_EVENTS & marks_mask &
~marks_ignored_mask;
return test_mask & user_mask;
}
struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
struct inode *inode, u32 mask,
const struct path *path)
static int fanotify_encode_fid(struct fanotify_event *event,
struct inode *inode, gfp_t gfp,
__kernel_fsid_t *fsid)
{
struct fanotify_event_info *event = NULL;
struct fanotify_fid *fid = &event->fid;
int dwords, bytes = 0;
int err, type;
fid->ext_fh = NULL;
dwords = 0;
err = -ENOENT;
type = exportfs_encode_inode_fh(inode, NULL, &dwords, NULL);
if (!dwords)
goto out_err;
bytes = dwords << 2;
if (bytes > FANOTIFY_INLINE_FH_LEN) {
/* Treat failure to allocate fh as failure to allocate event */
err = -ENOMEM;
fid->ext_fh = kmalloc(bytes, gfp);
if (!fid->ext_fh)
goto out_err;
}
type = exportfs_encode_inode_fh(inode, fanotify_fid_fh(fid, bytes),
&dwords, NULL);
err = -EINVAL;
if (!type || type == FILEID_INVALID || bytes != dwords << 2)
goto out_err;
fid->fsid = *fsid;
event->fh_len = bytes;
return type;
out_err:
pr_warn_ratelimited("fanotify: failed to encode fid (fsid=%x.%x, "
"type=%d, bytes=%d, err=%i)\n",
fsid->val[0], fsid->val[1], type, bytes, err);
kfree(fid->ext_fh);
fid->ext_fh = NULL;
event->fh_len = 0;
return FILEID_INVALID;
}
/*
* The inode to use as identifier when reporting fid depends on the event.
* Report the modified directory inode on dirent modification events.
* Report the "victim" inode otherwise.
* For example:
* FS_ATTRIB reports the child inode even if reported on a watched parent.
* FS_CREATE reports the modified dir inode and not the created inode.
*/
static struct inode *fanotify_fid_inode(struct inode *to_tell, u32 event_mask,
const void *data, int data_type)
{
if (event_mask & ALL_FSNOTIFY_DIRENT_EVENTS)
return to_tell;
else if (data_type == FSNOTIFY_EVENT_INODE)
return (struct inode *)data;
else if (data_type == FSNOTIFY_EVENT_PATH)
return d_inode(((struct path *)data)->dentry);
return NULL;
}
struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
struct inode *inode, u32 mask,
const void *data, int data_type,
__kernel_fsid_t *fsid)
{
struct fanotify_event *event = NULL;
gfp_t gfp = GFP_KERNEL_ACCOUNT;
struct inode *id = fanotify_fid_inode(inode, mask, data, data_type);
/*
* For queues with unlimited length lost events are not expected and
@ -160,28 +297,36 @@ struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
memalloc_use_memcg(group->memcg);
if (fanotify_is_perm_event(mask)) {
struct fanotify_perm_event_info *pevent;
struct fanotify_perm_event *pevent;
pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
if (!pevent)
goto out;
event = &pevent->fae;
pevent->response = 0;
pevent->state = FAN_EVENT_INIT;
goto init;
}
event = kmem_cache_alloc(fanotify_event_cachep, gfp);
if (!event)
goto out;
init: __maybe_unused
fsnotify_init_event(&event->fse, inode, mask);
fsnotify_init_event(&event->fse, inode);
event->mask = mask;
if (FAN_GROUP_FLAG(group, FAN_REPORT_TID))
event->pid = get_pid(task_pid(current));
else
event->pid = get_pid(task_tgid(current));
if (path) {
event->path = *path;
event->fh_len = 0;
if (id && FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
/* Report the event without a file identifier on encode error */
event->fh_type = fanotify_encode_fid(event, id, gfp, fsid);
} else if (data_type == FSNOTIFY_EVENT_PATH) {
event->fh_type = FILEID_ROOT;
event->path = *((struct path *)data);
path_get(&event->path);
} else {
event->fh_type = FILEID_INVALID;
event->path.mnt = NULL;
event->path.dentry = NULL;
}
@ -190,6 +335,29 @@ out:
return event;
}
/*
* Get cached fsid of the filesystem containing the object from any connector.
* All connectors are supposed to have the same fsid, but we do not verify that
* here.
*/
static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info)
{
int type;
__kernel_fsid_t fsid = {};
fsnotify_foreach_obj_type(type) {
if (!fsnotify_iter_should_report_type(iter_info, type))
continue;
fsid = iter_info->marks[type]->connector->fsid;
if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1]))
continue;
return fsid;
}
return fsid;
}
static int fanotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
u32 mask, const void *data, int data_type,
@ -197,14 +365,22 @@ static int fanotify_handle_event(struct fsnotify_group *group,
struct fsnotify_iter_info *iter_info)
{
int ret = 0;
struct fanotify_event_info *event;
struct fanotify_event *event;
struct fsnotify_event *fsn_event;
__kernel_fsid_t fsid = {};
BUILD_BUG_ON(FAN_ACCESS != FS_ACCESS);
BUILD_BUG_ON(FAN_MODIFY != FS_MODIFY);
BUILD_BUG_ON(FAN_ATTRIB != FS_ATTRIB);
BUILD_BUG_ON(FAN_CLOSE_NOWRITE != FS_CLOSE_NOWRITE);
BUILD_BUG_ON(FAN_CLOSE_WRITE != FS_CLOSE_WRITE);
BUILD_BUG_ON(FAN_OPEN != FS_OPEN);
BUILD_BUG_ON(FAN_MOVED_TO != FS_MOVED_TO);
BUILD_BUG_ON(FAN_MOVED_FROM != FS_MOVED_FROM);
BUILD_BUG_ON(FAN_CREATE != FS_CREATE);
BUILD_BUG_ON(FAN_DELETE != FS_DELETE);
BUILD_BUG_ON(FAN_DELETE_SELF != FS_DELETE_SELF);
BUILD_BUG_ON(FAN_MOVE_SELF != FS_MOVE_SELF);
BUILD_BUG_ON(FAN_EVENT_ON_CHILD != FS_EVENT_ON_CHILD);
BUILD_BUG_ON(FAN_Q_OVERFLOW != FS_Q_OVERFLOW);
BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
@ -213,9 +389,10 @@ static int fanotify_handle_event(struct fsnotify_group *group,
BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 12);
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
mask = fanotify_group_event_mask(iter_info, mask, data, data_type);
mask = fanotify_group_event_mask(group, iter_info, mask, data,
data_type);
if (!mask)
return 0;
@ -231,7 +408,11 @@ static int fanotify_handle_event(struct fsnotify_group *group,
return 0;
}
event = fanotify_alloc_event(group, inode, mask, data);
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID))
fsid = fanotify_get_fsid(iter_info);
event = fanotify_alloc_event(group, inode, mask, data, data_type,
&fsid);
ret = -ENOMEM;
if (unlikely(!event)) {
/*
@ -255,7 +436,6 @@ static int fanotify_handle_event(struct fsnotify_group *group,
} else if (fanotify_is_perm_event(mask)) {
ret = fanotify_get_response(group, FANOTIFY_PE(fsn_event),
iter_info);
fsnotify_destroy_event(group, fsn_event);
}
finish:
if (fanotify_is_perm_event(mask))
@ -275,12 +455,15 @@ static void fanotify_free_group_priv(struct fsnotify_group *group)
static void fanotify_free_event(struct fsnotify_event *fsn_event)
{
struct fanotify_event_info *event;
struct fanotify_event *event;
event = FANOTIFY_E(fsn_event);
path_put(&event->path);
if (fanotify_event_has_path(event))
path_put(&event->path);
else if (fanotify_event_has_ext_fh(event))
kfree(event->fid.ext_fh);
put_pid(event->pid);
if (fanotify_is_perm_event(fsn_event->mask)) {
if (fanotify_is_perm_event(event->mask)) {
kmem_cache_free(fanotify_perm_event_cachep,
FANOTIFY_PE(fsn_event));
return;

116
fs/notify/fanotify/fanotify.h
View File

@ -2,26 +2,112 @@
#include <linux/fsnotify_backend.h>
#include <linux/path.h>
#include <linux/slab.h>
#include <linux/exportfs.h>
extern struct kmem_cache *fanotify_mark_cache;
extern struct kmem_cache *fanotify_event_cachep;
extern struct kmem_cache *fanotify_perm_event_cachep;
/* Possible states of the permission event */
enum {
FAN_EVENT_INIT,
FAN_EVENT_REPORTED,
FAN_EVENT_ANSWERED,
FAN_EVENT_CANCELED,
};
/*
* 3 dwords are sufficient for most local fs (64bit ino, 32bit generation).
* For 32bit arch, fid increases the size of fanotify_event by 12 bytes and
* fh_* fields increase the size of fanotify_event by another 4 bytes.
* For 64bit arch, fid increases the size of fanotify_fid by 8 bytes and
* fh_* fields are packed in a hole after mask.
*/
#if BITS_PER_LONG == 32
#define FANOTIFY_INLINE_FH_LEN (3 << 2)
#else
#define FANOTIFY_INLINE_FH_LEN (4 << 2)
#endif
struct fanotify_fid {
__kernel_fsid_t fsid;
union {
unsigned char fh[FANOTIFY_INLINE_FH_LEN];
unsigned char *ext_fh;
};
};
static inline void *fanotify_fid_fh(struct fanotify_fid *fid,
unsigned int fh_len)
{
return fh_len <= FANOTIFY_INLINE_FH_LEN ? fid->fh : fid->ext_fh;
}
static inline bool fanotify_fid_equal(struct fanotify_fid *fid1,
struct fanotify_fid *fid2,
unsigned int fh_len)
{
return fid1->fsid.val[0] == fid2->fsid.val[0] &&
fid1->fsid.val[1] == fid2->fsid.val[1] &&
!memcmp(fanotify_fid_fh(fid1, fh_len),
fanotify_fid_fh(fid2, fh_len), fh_len);
}
/*
* Structure for normal fanotify events. It gets allocated in
* fanotify_handle_event() and freed when the information is retrieved by
* userspace
*/
struct fanotify_event_info {
struct fanotify_event {
struct fsnotify_event fse;
u32 mask;
/*
* We hold ref to this path so it may be dereferenced at any point
* during this object's lifetime
* Those fields are outside fanotify_fid to pack fanotify_event nicely
* on 64bit arch and to use fh_type as an indication of whether path
* or fid are used in the union:
* FILEID_ROOT (0) for path, > 0 for fid, FILEID_INVALID for neither.
*/
struct path path;
u8 fh_type;
u8 fh_len;
u16 pad;
union {
/*
* We hold ref to this path so it may be dereferenced at any
* point during this object's lifetime
*/
struct path path;
/*
* With FAN_REPORT_FID, we do not hold any reference on the
* victim object. Instead we store its NFS file handle and its
* filesystem's fsid as a unique identifier.
*/
struct fanotify_fid fid;
};
struct pid *pid;
};
static inline bool fanotify_event_has_path(struct fanotify_event *event)
{
return event->fh_type == FILEID_ROOT;
}
static inline bool fanotify_event_has_fid(struct fanotify_event *event)
{
return event->fh_type != FILEID_ROOT &&
event->fh_type != FILEID_INVALID;
}
static inline bool fanotify_event_has_ext_fh(struct fanotify_event *event)
{
return fanotify_event_has_fid(event) &&
event->fh_len > FANOTIFY_INLINE_FH_LEN;
}
static inline void *fanotify_event_fh(struct fanotify_event *event)
{
return fanotify_fid_fh(&event->fid, event->fh_len);
}
/*
* Structure for permission fanotify events. It gets allocated and freed in
* fanotify_handle_event() since we wait there for user response. When the
@ -29,16 +115,17 @@ struct fanotify_event_info {
* group->notification_list to group->fanotify_data.access_list to wait for
* user response.
*/
struct fanotify_perm_event_info {
struct fanotify_event_info fae;
int response; /* userspace answer to question */
struct fanotify_perm_event {
struct fanotify_event fae;
unsigned short response; /* userspace answer to the event */
unsigned short state; /* state of the event */
int fd; /* fd we passed to userspace for this event */
};
static inline struct fanotify_perm_event_info *
static inline struct fanotify_perm_event *
FANOTIFY_PE(struct fsnotify_event *fse)
{
return container_of(fse, struct fanotify_perm_event_info, fae.fse);
return container_of(fse, struct fanotify_perm_event, fae.fse);
}
static inline bool fanotify_is_perm_event(u32 mask)
@ -47,11 +134,12 @@ static inline bool fanotify_is_perm_event(u32 mask)
mask & FANOTIFY_PERM_EVENTS;
}
static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse)
static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse)
{
return container_of(fse, struct fanotify_event_info, fse);
return container_of(fse, struct fanotify_event, fse);
}
struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
struct inode *inode, u32 mask,
const struct path *path);
struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
struct inode *inode, u32 mask,
const void *data, int data_type,
__kernel_fsid_t *fsid);

369
fs/notify/fanotify/fanotify_user.c
View File

@ -17,6 +17,8 @@
#include <linux/compat.h>
#include <linux/sched/signal.h>
#include <linux/memcontrol.h>
#include <linux/statfs.h>
#include <linux/exportfs.h>
#include <asm/ioctls.h>
@ -47,33 +49,55 @@ struct kmem_cache *fanotify_mark_cache __read_mostly;
struct kmem_cache *fanotify_event_cachep __read_mostly;
struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
#define FANOTIFY_EVENT_ALIGN 4
static int fanotify_event_info_len(struct fanotify_event *event)
{
if (!fanotify_event_has_fid(event))
return 0;
return roundup(sizeof(struct fanotify_event_info_fid) +
sizeof(struct file_handle) + event->fh_len,
FANOTIFY_EVENT_ALIGN);
}
/*
* Get an fsnotify notification event if one exists and is small
* enough to fit in "count". Return an error pointer if the count
* is not large enough.
*
* Called with the group->notification_lock held.
* is not large enough. When permission event is dequeued, its state is
* updated accordingly.
*/
static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
size_t count)
{
assert_spin_locked(&group->notification_lock);
size_t event_size = FAN_EVENT_METADATA_LEN;
struct fsnotify_event *fsn_event = NULL;
pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
spin_lock(&group->notification_lock);
if (fsnotify_notify_queue_is_empty(group))
return NULL;
goto out;
if (FAN_EVENT_METADATA_LEN > count)
return ERR_PTR(-EINVAL);
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
event_size += fanotify_event_info_len(
FANOTIFY_E(fsnotify_peek_first_event(group)));
}
/* held the notification_lock the whole time, so this is the
* same event we peeked above */
return fsnotify_remove_first_event(group);
if (event_size > count) {
fsn_event = ERR_PTR(-EINVAL);
goto out;
}
fsn_event = fsnotify_remove_first_event(group);
if (fanotify_is_perm_event(FANOTIFY_E(fsn_event)->mask))
FANOTIFY_PE(fsn_event)->state = FAN_EVENT_REPORTED;
out:
spin_unlock(&group->notification_lock);
return fsn_event;
}
static int create_fd(struct fsnotify_group *group,
struct fanotify_event_info *event,
struct fanotify_event *event,
struct file **file)
{
int client_fd;
@ -114,62 +138,32 @@ static int create_fd(struct fsnotify_group *group,
return client_fd;
}
static int fill_event_metadata(struct fsnotify_group *group,
struct fanotify_event_metadata *metadata,
struct fsnotify_event *fsn_event,
struct file **file)
/*
* Finish processing of permission event by setting it to ANSWERED state and
* drop group->notification_lock.
*/
static void finish_permission_event(struct fsnotify_group *group,
struct fanotify_perm_event *event,
unsigned int response)
__releases(&group->notification_lock)
{
int ret = 0;
struct fanotify_event_info *event;
bool destroy = false;
pr_debug("%s: group=%p metadata=%p event=%p\n", __func__,
group, metadata, fsn_event);
*file = NULL;
event = container_of(fsn_event, struct fanotify_event_info, fse);
metadata->event_len = FAN_EVENT_METADATA_LEN;
metadata->metadata_len = FAN_EVENT_METADATA_LEN;
metadata->vers = FANOTIFY_METADATA_VERSION;
metadata->reserved = 0;
metadata->mask = fsn_event->mask & FANOTIFY_OUTGOING_EVENTS;
metadata->pid = pid_vnr(event->pid);
if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW))
metadata->fd = FAN_NOFD;
else {
metadata->fd = create_fd(group, event, file);
if (metadata->fd < 0)
ret = metadata->fd;
}
return ret;
}
static struct fanotify_perm_event_info *dequeue_event(
struct fsnotify_group *group, int fd)
{
struct fanotify_perm_event_info *event, *return_e = NULL;
spin_lock(&group->notification_lock);
list_for_each_entry(event, &group->fanotify_data.access_list,
fae.fse.list) {
if (event->fd != fd)
continue;
list_del_init(&event->fae.fse.list);
return_e = event;
break;
}
assert_spin_locked(&group->notification_lock);
event->response = response;
if (event->state == FAN_EVENT_CANCELED)
destroy = true;
else
event->state = FAN_EVENT_ANSWERED;
spin_unlock(&group->notification_lock);
pr_debug("%s: found return_re=%p\n", __func__, return_e);
return return_e;
if (destroy)
fsnotify_destroy_event(group, &event->fae.fse);
}
static int process_access_response(struct fsnotify_group *group,
struct fanotify_response *response_struct)
{
struct fanotify_perm_event_info *event;
struct fanotify_perm_event *event;
int fd = response_struct->fd;
int response = response_struct->response;
@ -194,48 +188,115 @@ static int process_access_response(struct fsnotify_group *group,
if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT))
return -EINVAL;
event = dequeue_event(group, fd);
if (!event)
return -ENOENT;
spin_lock(&group->notification_lock);
list_for_each_entry(event, &group->fanotify_data.access_list,
fae.fse.list) {
if (event->fd != fd)
continue;
event->response = response;
wake_up(&group->fanotify_data.access_waitq);
list_del_init(&event->fae.fse.list);
finish_permission_event(group, event, response);
wake_up(&group->fanotify_data.access_waitq);
return 0;
}
spin_unlock(&group->notification_lock);
return -ENOENT;
}
static int copy_fid_to_user(struct fanotify_event *event, char __user *buf)
{
struct fanotify_event_info_fid info = { };
struct file_handle handle = { };
size_t fh_len = event->fh_len;
size_t len = fanotify_event_info_len(event);
if (!len)
return 0;
if (WARN_ON_ONCE(len < sizeof(info) + sizeof(handle) + fh_len))
return -EFAULT;
/* Copy event info fid header followed by vaiable sized file handle */
info.hdr.info_type = FAN_EVENT_INFO_TYPE_FID;
info.hdr.len = len;
info.fsid = event->fid.fsid;
if (copy_to_user(buf, &info, sizeof(info)))
return -EFAULT;
buf += sizeof(info);
len -= sizeof(info);
handle.handle_type = event->fh_type;
handle.handle_bytes = fh_len;
if (copy_to_user(buf, &handle, sizeof(handle)))
return -EFAULT;
buf += sizeof(handle);
len -= sizeof(handle);
if (copy_to_user(buf, fanotify_event_fh(event), fh_len))
return -EFAULT;
/* Pad with 0's */
buf += fh_len;
len -= fh_len;
WARN_ON_ONCE(len < 0 || len >= FANOTIFY_EVENT_ALIGN);
if (len > 0 && clear_user(buf, len))
return -EFAULT;
return 0;
}
static ssize_t copy_event_to_user(struct fsnotify_group *group,
struct fsnotify_event *event,
struct fsnotify_event *fsn_event,
char __user *buf, size_t count)
{
struct fanotify_event_metadata fanotify_event_metadata;
struct file *f;
int fd, ret;
struct fanotify_event_metadata metadata;
struct fanotify_event *event;
struct file *f = NULL;
int ret, fd = FAN_NOFD;
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
pr_debug("%s: group=%p event=%p\n", __func__, group, fsn_event);
ret = fill_event_metadata(group, &fanotify_event_metadata, event, &f);
if (ret < 0)
return ret;
event = container_of(fsn_event, struct fanotify_event, fse);
metadata.event_len = FAN_EVENT_METADATA_LEN;
metadata.metadata_len = FAN_EVENT_METADATA_LEN;
metadata.vers = FANOTIFY_METADATA_VERSION;
metadata.reserved = 0;
metadata.mask = event->mask & FANOTIFY_OUTGOING_EVENTS;
metadata.pid = pid_vnr(event->pid);
if (fanotify_event_has_path(event)) {
fd = create_fd(group, event, &f);
if (fd < 0)
return fd;
} else if (fanotify_event_has_fid(event)) {
metadata.event_len += fanotify_event_info_len(event);
}
metadata.fd = fd;
fd = fanotify_event_metadata.fd;
ret = -EFAULT;
/*
* Sanity check copy size in case get_one_event() and
* fill_event_metadata() event_len sizes ever get out of sync.
*/
if (WARN_ON_ONCE(fanotify_event_metadata.event_len > count))
if (WARN_ON_ONCE(metadata.event_len > count))
goto out_close_fd;
if (copy_to_user(buf, &fanotify_event_metadata,
fanotify_event_metadata.event_len))
if (copy_to_user(buf, &metadata, FAN_EVENT_METADATA_LEN))
goto out_close_fd;
if (fanotify_is_perm_event(event->mask))
FANOTIFY_PE(event)->fd = fd;
FANOTIFY_PE(fsn_event)->fd = fd;
if (fd != FAN_NOFD)
if (fanotify_event_has_path(event)) {
fd_install(fd, f);
return fanotify_event_metadata.event_len;
} else if (fanotify_event_has_fid(event)) {
ret = copy_fid_to_user(event, buf + FAN_EVENT_METADATA_LEN);
if (ret < 0)
return ret;
}
return metadata.event_len;
out_close_fd:
if (fd != FAN_NOFD) {
@ -276,10 +337,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
add_wait_queue(&group->notification_waitq, &wait);
while (1) {
spin_lock(&group->notification_lock);
kevent = get_one_event(group, count);
spin_unlock(&group->notification_lock);
if (IS_ERR(kevent)) {
ret = PTR_ERR(kevent);
break;
@ -316,11 +374,13 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
* Permission events get queued to wait for response. Other
* events can be destroyed now.
*/
if (!fanotify_is_perm_event(kevent->mask)) {
if (!fanotify_is_perm_event(FANOTIFY_E(kevent)->mask)) {
fsnotify_destroy_event(group, kevent);
} else {
if (ret <= 0) {
FANOTIFY_PE(kevent)->response = FAN_DENY;
spin_lock(&group->notification_lock);
finish_permission_event(group,
FANOTIFY_PE(kevent), FAN_DENY);
wake_up(&group->fanotify_data.access_waitq);
} else {
spin_lock(&group->notification_lock);
@ -370,7 +430,7 @@ static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t
static int fanotify_release(struct inode *ignored, struct file *file)
{
struct fsnotify_group *group = file->private_data;
struct fanotify_perm_event_info *event, *next;
struct fanotify_perm_event *event;
struct fsnotify_event *fsn_event;
/*
@ -385,13 +445,12 @@ static int fanotify_release(struct inode *ignored, struct file *file)
* and simulate reply from userspace.
*/
spin_lock(&group->notification_lock);
list_for_each_entry_safe(event, next, &group->fanotify_data.access_list,
fae.fse.list) {
pr_debug("%s: found group=%p event=%p\n", __func__, group,
event);
while (!list_empty(&group->fanotify_data.access_list)) {
event = list_first_entry(&group->fanotify_data.access_list,
struct fanotify_perm_event, fae.fse.list);
list_del_init(&event->fae.fse.list);
event->response = FAN_ALLOW;
finish_permission_event(group, event, FAN_ALLOW);
spin_lock(&group->notification_lock);
}
/*
@ -401,13 +460,14 @@ static int fanotify_release(struct inode *ignored, struct file *file)
*/
while (!fsnotify_notify_queue_is_empty(group)) {
fsn_event = fsnotify_remove_first_event(group);
if (!(fsn_event->mask & FANOTIFY_PERM_EVENTS)) {
if (!(FANOTIFY_E(fsn_event)->mask & FANOTIFY_PERM_EVENTS)) {
spin_unlock(&group->notification_lock);
fsnotify_destroy_event(group, fsn_event);
spin_lock(&group->notification_lock);
} else {
FANOTIFY_PE(fsn_event)->response = FAN_ALLOW;
finish_permission_event(group, FANOTIFY_PE(fsn_event),
FAN_ALLOW);
}
spin_lock(&group->notification_lock);
}
spin_unlock(&group->notification_lock);
@ -598,7 +658,8 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
fsnotify_connp_t *connp,
unsigned int type)
unsigned int type,
__kernel_fsid_t *fsid)
{
struct fsnotify_mark *mark;
int ret;
@ -611,7 +672,7 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
return ERR_PTR(-ENOMEM);
fsnotify_init_mark(mark, group);
ret = fsnotify_add_mark_locked(mark, connp, type, 0);
ret = fsnotify_add_mark_locked(mark, connp, type, 0, fsid);
if (ret) {
fsnotify_put_mark(mark);
return ERR_PTR(ret);
@ -623,7 +684,8 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
static int fanotify_add_mark(struct fsnotify_group *group,
fsnotify_connp_t *connp, unsigned int type,
__u32 mask, unsigned int flags)
__u32 mask, unsigned int flags,
__kernel_fsid_t *fsid)
{
struct fsnotify_mark *fsn_mark;
__u32 added;
@ -631,7 +693,7 @@ static int fanotify_add_mark(struct fsnotify_group *group,
mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_mark(connp, group);
if (!fsn_mark) {
fsn_mark = fanotify_add_new_mark(group, connp, type);
fsn_mark = fanotify_add_new_mark(group, connp, type, fsid);
if (IS_ERR(fsn_mark)) {
mutex_unlock(&group->mark_mutex);
return PTR_ERR(fsn_mark);
@ -648,23 +710,23 @@ static int fanotify_add_mark(struct fsnotify_group *group,
static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
struct vfsmount *mnt, __u32 mask,
unsigned int flags)
unsigned int flags, __kernel_fsid_t *fsid)
{
return fanotify_add_mark(group, &real_mount(mnt)->mnt_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_VFSMOUNT, mask, flags);
FSNOTIFY_OBJ_TYPE_VFSMOUNT, mask, flags, fsid);
}
static int fanotify_add_sb_mark(struct fsnotify_group *group,
struct super_block *sb, __u32 mask,
unsigned int flags)
struct super_block *sb, __u32 mask,
unsigned int flags, __kernel_fsid_t *fsid)
{
return fanotify_add_mark(group, &sb->s_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_SB, mask, flags);
FSNOTIFY_OBJ_TYPE_SB, mask, flags, fsid);
}
static int fanotify_add_inode_mark(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
unsigned int flags)
unsigned int flags, __kernel_fsid_t *fsid)
{
pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
@ -679,7 +741,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
return 0;
return fanotify_add_mark(group, &inode->i_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_INODE, mask, flags);
FSNOTIFY_OBJ_TYPE_INODE, mask, flags, fsid);
}
/* fanotify syscalls */
@ -688,7 +750,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
struct fsnotify_group *group;
int f_flags, fd;
struct user_struct *user;
struct fanotify_event_info *oevent;
struct fanotify_event *oevent;
pr_debug("%s: flags=%x event_f_flags=%x\n",
__func__, flags, event_f_flags);
@ -715,6 +777,10 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
return -EINVAL;
}
if ((flags & FAN_REPORT_FID) &&
(flags & FANOTIFY_CLASS_BITS) != FAN_CLASS_NOTIF)
return -EINVAL;
user = get_current_user();
if (atomic_read(&user->fanotify_listeners) > FANOTIFY_DEFAULT_MAX_LISTENERS) {
free_uid(user);
@ -739,7 +805,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
atomic_inc(&user->fanotify_listeners);
group->memcg = get_mem_cgroup_from_mm(current->mm);
oevent = fanotify_alloc_event(group, NULL, FS_Q_OVERFLOW, NULL);
oevent = fanotify_alloc_event(group, NULL, FS_Q_OVERFLOW, NULL,
FSNOTIFY_EVENT_NONE, NULL);
if (unlikely(!oevent)) {
fd = -ENOMEM;
goto out_destroy_group;
@ -801,6 +868,48 @@ out_destroy_group:
return fd;
}
/* Check if filesystem can encode a unique fid */
static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
{
__kernel_fsid_t root_fsid;
int err;
/*
* Make sure path is not in filesystem with zero fsid (e.g. tmpfs).
*/
err = vfs_get_fsid(path->dentry, fsid);
if (err)
return err;
if (!fsid->val[0] && !fsid->val[1])
return -ENODEV;
/*
* Make sure path is not inside a filesystem subvolume (e.g. btrfs)
* which uses a different fsid than sb root.
*/
err = vfs_get_fsid(path->dentry->d_sb->s_root, &root_fsid);
if (err)
return err;
if (root_fsid.val[0] != fsid->val[0] ||
root_fsid.val[1] != fsid->val[1])
return -EXDEV;
/*
* We need to make sure that the file system supports at least
* encoding a file handle so user can use name_to_handle_at() to
* compare fid returned with event to the file handle of watched
* objects. However, name_to_handle_at() requires that the
* filesystem also supports decoding file handles.
*/
if (!path->dentry->d_sb->s_export_op ||
!path->dentry->d_sb->s_export_op->fh_to_dentry)
return -EOPNOTSUPP;
return 0;
}
static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
int dfd, const char __user *pathname)
{
@ -809,6 +918,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
struct fsnotify_group *group;
struct fd f;
struct path path;
__kernel_fsid_t __fsid, *fsid = NULL;
u32 valid_mask = FANOTIFY_EVENTS | FANOTIFY_EVENT_FLAGS;
unsigned int mark_type = flags & FANOTIFY_MARK_TYPE_BITS;
int ret;
@ -871,6 +981,18 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
group->priority == FS_PRIO_0)
goto fput_and_out;
/*
* Events with data type inode do not carry enough information to report
* event->fd, so we do not allow setting a mask for inode events unless
* group supports reporting fid.
* inode events are not supported on a mount mark, because they do not
* carry enough information (i.e. path) to be filtered by mount point.
*/
if (mask & FANOTIFY_INODE_EVENTS &&
(!FAN_GROUP_FLAG(group, FAN_REPORT_FID) ||
mark_type == FAN_MARK_MOUNT))
goto fput_and_out;
if (flags & FAN_MARK_FLUSH) {
ret = 0;
if (mark_type == FAN_MARK_MOUNT)
@ -886,6 +1008,14 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
if (ret)
goto fput_and_out;
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
ret = fanotify_test_fid(&path, &__fsid);
if (ret)
goto path_put_and_out;
fsid = &__fsid;
}
/* inode held in place by reference to path; group by fget on fd */
if (mark_type == FAN_MARK_INODE)
inode = path.dentry->d_inode;
@ -896,24 +1026,31 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) {
case FAN_MARK_ADD:
if (mark_type == FAN_MARK_MOUNT)
ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags);
ret = fanotify_add_vfsmount_mark(group, mnt, mask,
flags, fsid);
else if (mark_type == FAN_MARK_FILESYSTEM)
ret = fanotify_add_sb_mark(group, mnt->mnt_sb, mask, flags);
ret = fanotify_add_sb_mark(group, mnt->mnt_sb, mask,
flags, fsid);
else
ret = fanotify_add_inode_mark(group, inode, mask, flags);
ret = fanotify_add_inode_mark(group, inode, mask,
flags, fsid);
break;
case FAN_MARK_REMOVE:
if (mark_type == FAN_MARK_MOUNT)
ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags);
ret = fanotify_remove_vfsmount_mark(group, mnt, mask,
flags);
else if (mark_type == FAN_MARK_FILESYSTEM)
ret = fanotify_remove_sb_mark(group, mnt->mnt_sb, mask, flags);
ret = fanotify_remove_sb_mark(group, mnt->mnt_sb, mask,
flags);
else
ret = fanotify_remove_inode_mark(group, inode, mask, flags);
ret = fanotify_remove_inode_mark(group, inode, mask,
flags);
break;
default:
ret = -EINVAL;
}
path_put_and_out:
path_put(&path);
fput_and_out:
fdput(f);
@ -950,15 +1087,15 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark,
*/
static int __init fanotify_user_setup(void)
{
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 7);
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 8);
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9);
fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,
SLAB_PANIC|SLAB_ACCOUNT);
fanotify_event_cachep = KMEM_CACHE(fanotify_event_info, SLAB_PANIC);
fanotify_event_cachep = KMEM_CACHE(fanotify_event, SLAB_PANIC);
if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) {
fanotify_perm_event_cachep =
KMEM_CACHE(fanotify_perm_event_info, SLAB_PANIC);
KMEM_CACHE(fanotify_perm_event, SLAB_PANIC);
}
return 0;

15
fs/notify/fsnotify.c
View File

@ -328,16 +328,15 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
const unsigned char *file_name, u32 cookie)
{
struct fsnotify_iter_info iter_info = {};
struct super_block *sb = NULL;
struct super_block *sb = to_tell->i_sb;
struct mount *mnt = NULL;
__u32 mnt_or_sb_mask = 0;
__u32 mnt_or_sb_mask = sb->s_fsnotify_mask;
int ret = 0;
__u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS);
if (data_is == FSNOTIFY_EVENT_PATH) {
mnt = real_mount(((const struct path *)data)->mnt);
sb = mnt->mnt.mnt_sb;
mnt_or_sb_mask = mnt->mnt_fsnotify_mask | sb->s_fsnotify_mask;
mnt_or_sb_mask |= mnt->mnt_fsnotify_mask;
}
/* An event "on child" is not intended for a mount/sb mark */
if (mask & FS_EVENT_ON_CHILD)
@ -350,8 +349,8 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
* SRCU because we have no references to any objects and do not
* need SRCU to keep them "alive".
*/
if (!to_tell->i_fsnotify_marks &&
(!mnt || (!mnt->mnt_fsnotify_marks && !sb->s_fsnotify_marks)))
if (!to_tell->i_fsnotify_marks && !sb->s_fsnotify_marks &&
(!mnt || !mnt->mnt_fsnotify_marks))
return 0;
/*
* if this is a modify event we may need to clear the ignored masks
@ -366,11 +365,11 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] =
fsnotify_first_mark(&to_tell->i_fsnotify_marks);
iter_info.marks[FSNOTIFY_OBJ_TYPE_SB] =
fsnotify_first_mark(&sb->s_fsnotify_marks);
if (mnt) {
iter_info.marks[FSNOTIFY_OBJ_TYPE_VFSMOUNT] =
fsnotify_first_mark(&mnt->mnt_fsnotify_marks);
iter_info.marks[FSNOTIFY_OBJ_TYPE_SB] =
fsnotify_first_mark(&sb->s_fsnotify_marks);
}
/*

1
fs/notify/inotify/inotify.h
View File

@ -5,6 +5,7 @@
struct inotify_event_info {
struct fsnotify_event fse;
u32 mask;
int wd;
u32 sync_cookie;
int name_len;

18
fs/notify/inotify/inotify_fsnotify.c
View File

@ -43,11 +43,11 @@ static bool event_compare(struct fsnotify_event *old_fsn,
{
struct inotify_event_info *old, *new;
if (old_fsn->mask & FS_IN_IGNORED)
return false;
old = INOTIFY_E(old_fsn);
new = INOTIFY_E(new_fsn);
if ((old_fsn->mask == new_fsn->mask) &&
if (old->mask & FS_IN_IGNORED)
return false;
if ((old->mask == new->mask) &&
(old_fsn->inode == new_fsn->inode) &&
(old->name_len == new->name_len) &&
(!old->name_len || !strcmp(old->name, new->name)))
@ -113,8 +113,18 @@ int inotify_handle_event(struct fsnotify_group *group,
return -ENOMEM;
}
/*
* We now report FS_ISDIR flag with MOVE_SELF and DELETE_SELF events
* for fanotify. inotify never reported IN_ISDIR with those events.
* It looks like an oversight, but to avoid the risk of breaking
* existing inotify programs, mask the flag out from those events.
*/
if (mask & (IN_MOVE_SELF | IN_DELETE_SELF))
mask &= ~IN_ISDIR;
fsn_event = &event->fse;
fsnotify_init_event(fsn_event, inode, mask);
fsnotify_init_event(fsn_event, inode);
event->mask = mask;
event->wd = i_mark->wd;
event->sync_cookie = cookie;
event->name_len = len;

5
fs/notify/inotify/inotify_user.c
View File

@ -189,7 +189,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
*/
pad_name_len = round_event_name_len(fsn_event);
inotify_event.len = pad_name_len;
inotify_event.mask = inotify_mask_to_arg(fsn_event->mask);
inotify_event.mask = inotify_mask_to_arg(event->mask);
inotify_event.wd = event->wd;
inotify_event.cookie = event->sync_cookie;
@ -634,7 +634,8 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events)
return ERR_PTR(-ENOMEM);
}
group->overflow_event = &oevent->fse;
fsnotify_init_event(group->overflow_event, NULL, FS_Q_OVERFLOW);
fsnotify_init_event(group->overflow_event, NULL);
oevent->mask = FS_Q_OVERFLOW;
oevent->wd = -1;
oevent->sync_cookie = 0;
oevent->name_len = 0;

42
fs/notify/mark.c
View File

@ -82,6 +82,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/srcu.h>
#include <linux/ratelimit.h>
#include <linux/atomic.h>
@ -481,7 +482,8 @@ int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b)
}
static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
unsigned int type)
unsigned int type,
__kernel_fsid_t *fsid)
{
struct inode *inode = NULL;
struct fsnotify_mark_connector *conn;
@ -493,6 +495,11 @@ static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
INIT_HLIST_HEAD(&conn->list);
conn->type = type;
conn->obj = connp;
/* Cache fsid of filesystem containing the object */
if (fsid)
conn->fsid = *fsid;
else
conn->fsid.val[0] = conn->fsid.val[1] = 0;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
inode = igrab(fsnotify_conn_inode(conn));
/*
@ -544,7 +551,7 @@ out:
*/
static int fsnotify_add_mark_list(struct fsnotify_mark *mark,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups)
int allow_dups, __kernel_fsid_t *fsid)
{
struct fsnotify_mark *lmark, *last = NULL;
struct fsnotify_mark_connector *conn;
@ -553,15 +560,36 @@ static int fsnotify_add_mark_list(struct fsnotify_mark *mark,
if (WARN_ON(!fsnotify_valid_obj_type(type)))
return -EINVAL;
/* Backend is expected to check for zero fsid (e.g. tmpfs) */
if (fsid && WARN_ON_ONCE(!fsid->val[0] && !fsid->val[1]))
return -ENODEV;
restart:
spin_lock(&mark->lock);
conn = fsnotify_grab_connector(connp);
if (!conn) {
spin_unlock(&mark->lock);
err = fsnotify_attach_connector_to_object(connp, type);
err = fsnotify_attach_connector_to_object(connp, type, fsid);
if (err)
return err;
goto restart;
} else if (fsid && (conn->fsid.val[0] || conn->fsid.val[1]) &&
(fsid->val[0] != conn->fsid.val[0] ||
fsid->val[1] != conn->fsid.val[1])) {
/*
* Backend is expected to check for non uniform fsid
* (e.g. btrfs), but maybe we missed something?
* Only allow setting conn->fsid once to non zero fsid.
* inotify and non-fid fanotify groups do not set nor test
* conn->fsid.
*/
pr_warn_ratelimited("%s: fsid mismatch on object of type %u: "
"%x.%x != %x.%x\n", __func__, conn->type,
fsid->val[0], fsid->val[1],
conn->fsid.val[0], conn->fsid.val[1]);
err = -EXDEV;
goto out_err;
}
/* is mark the first mark? */
@ -606,7 +634,7 @@ out_err:
*/
int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups)
int allow_dups, __kernel_fsid_t *fsid)
{
struct fsnotify_group *group = mark->group;
int ret = 0;
@ -627,7 +655,7 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
fsnotify_get_mark(mark); /* for g_list */
spin_unlock(&mark->lock);
ret = fsnotify_add_mark_list(mark, connp, type, allow_dups);
ret = fsnotify_add_mark_list(mark, connp, type, allow_dups, fsid);
if (ret)
goto err;
@ -648,13 +676,13 @@ err:
}
int fsnotify_add_mark(struct fsnotify_mark *mark, fsnotify_connp_t *connp,
unsigned int type, int allow_dups)
unsigned int type, int allow_dups, __kernel_fsid_t *fsid)
{
int ret;
struct fsnotify_group *group = mark->group;
mutex_lock(&group->mark_mutex);
ret = fsnotify_add_mark_locked(mark, connp, type, allow_dups);
ret = fsnotify_add_mark_locked(mark, connp, type, allow_dups, fsid);
mutex_unlock(&group->mark_mutex);
return ret;
}

42
fs/notify/notification.c
View File

@ -71,7 +71,7 @@ void fsnotify_destroy_event(struct fsnotify_group *group,
struct fsnotify_event *event)
{
/* Overflow events are per-group and we don't want to free them */
if (!event || event->mask == FS_Q_OVERFLOW)
if (!event || event == group->overflow_event)
return;
/*
* If the event is still queued, we have a problem... Do an unreliable
@ -141,6 +141,18 @@ queue:
return ret;
}
void fsnotify_remove_queued_event(struct fsnotify_group *group,
struct fsnotify_event *event)
{
assert_spin_locked(&group->notification_lock);
/*
* We need to init list head for the case of overflow event so that
* check in fsnotify_add_event() works
*/
list_del_init(&event->list);
group->q_len--;
}
/*
* Remove and return the first event from the notification list. It is the
* responsibility of the caller to destroy the obtained event
@ -155,13 +167,7 @@ struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group)
event = list_first_entry(&group->notification_list,
struct fsnotify_event, list);
/*
* We need to init list head for the case of overflow event so that
* check in fsnotify_add_event() works
*/
list_del_init(&event->list);
group->q_len--;
fsnotify_remove_queued_event(group, event);
return event;
}
@ -194,23 +200,3 @@ void fsnotify_flush_notify(struct fsnotify_group *group)
}
spin_unlock(&group->notification_lock);
}
/*
* fsnotify_create_event - Allocate a new event which will be sent to each
* group's handle_event function if the group was interested in this
* particular event.
*
* @inode the inode which is supposed to receive the event (sometimes a
* parent of the inode to which the event happened.
* @mask what actually happened.
* @data pointer to the object which was actually affected
* @data_type flag indication if the data is a file, path, inode, nothing...
* @name the filename, if available
*/
void fsnotify_init_event(struct fsnotify_event *event, struct inode *inode,
u32 mask)
{
INIT_LIST_HEAD(&event->list);
event->inode = inode;
event->mask = mask;
}

14
fs/statfs.c
View File

@ -67,6 +67,20 @@ static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
return retval;
}
int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid)
{
struct kstatfs st;
int error;
error = statfs_by_dentry(dentry, &st);
if (error)
return error;
*fsid = st.f_fsid;
return 0;
}
EXPORT_SYMBOL(vfs_get_fsid);
int vfs_statfs(const struct path *path, struct kstatfs *buf)
{
int error;

26
include/linux/fanotify.h
View File

@ -19,7 +19,7 @@
FAN_CLASS_PRE_CONTENT)
#define FANOTIFY_INIT_FLAGS (FANOTIFY_CLASS_BITS | \
FAN_REPORT_TID | \
FAN_REPORT_TID | FAN_REPORT_FID | \
FAN_CLOEXEC | FAN_NONBLOCK | \
FAN_UNLIMITED_QUEUE | FAN_UNLIMITED_MARKS)
@ -35,10 +35,28 @@
FAN_MARK_IGNORED_SURV_MODIFY | \
FAN_MARK_FLUSH)
/* Events that user can request to be notified on */
#define FANOTIFY_EVENTS (FAN_ACCESS | FAN_MODIFY | \
/*
* Events that can be reported with data type FSNOTIFY_EVENT_PATH.
* Note that FAN_MODIFY can also be reported with data type
* FSNOTIFY_EVENT_INODE.
*/
#define FANOTIFY_PATH_EVENTS (FAN_ACCESS | FAN_MODIFY | \
FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC)
/*
* Directory entry modification events - reported only to directory
* where entry is modified and not to a watching parent.
*/
#define FANOTIFY_DIRENT_EVENTS (FAN_MOVE | FAN_CREATE | FAN_DELETE)
/* Events that can only be reported with data type FSNOTIFY_EVENT_INODE */
#define FANOTIFY_INODE_EVENTS (FANOTIFY_DIRENT_EVENTS | \
FAN_ATTRIB | FAN_MOVE_SELF | FAN_DELETE_SELF)
/* Events that user can request to be notified on */
#define FANOTIFY_EVENTS (FANOTIFY_PATH_EVENTS | \
FANOTIFY_INODE_EVENTS)
/* Events that require a permission response from user */
#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \
FAN_OPEN_EXEC_PERM)
@ -49,7 +67,7 @@
/* Events that may be reported to user */
#define FANOTIFY_OUTGOING_EVENTS (FANOTIFY_EVENTS | \
FANOTIFY_PERM_EVENTS | \
FAN_Q_OVERFLOW)
FAN_Q_OVERFLOW | FAN_ONDIR)
#define ALL_FANOTIFY_EVENT_BITS (FANOTIFY_OUTGOING_EVENTS | \
FANOTIFY_EVENT_FLAGS)

73
include/linux/fsnotify.h
View File

@ -17,8 +17,22 @@
#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.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)
static inline int fsnotify_parent(const struct path *path,
struct dentry *dentry, __u32 mask)
{
if (!dentry)
dentry = path->dentry;
@ -65,6 +79,9 @@ static inline int fsnotify_perm(struct file *file, int mask)
fsnotify_mask = FS_ACCESS_PERM;
}
if (S_ISDIR(inode->i_mode))
fsnotify_mask |= FS_ISDIR;
return fsnotify_path(inode, path, fsnotify_mask);
}
@ -73,7 +90,12 @@ static inline int fsnotify_perm(struct file *file, int mask)
*/
static inline void fsnotify_link_count(struct inode *inode)
{
fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
__u32 mask = FS_ATTRIB;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
}
/*
@ -81,12 +103,14 @@ static inline void fsnotify_link_count(struct inode *inode)
*/
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)
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);
__u32 old_dir_mask = FS_MOVED_FROM;
__u32 new_dir_mask = FS_MOVED_TO;
__u32 mask = FS_MOVE_SELF;
const unsigned char *new_name = moved->d_name.name;
if (old_dir == new_dir)
@ -95,6 +119,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
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,
@ -106,7 +131,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
fsnotify_link_count(target);
if (source)
fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
fsnotify(source, mask, source, FSNOTIFY_EVENT_INODE, NULL, 0);
audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
}
@ -128,15 +153,35 @@ static inline void fsnotify_vfsmount_delete(struct vfsmount *mnt)
/*
* fsnotify_nameremove - a filename was removed from a directory
*
* This is mostly called under parent vfs inode lock so name and
* dentry->d_parent should be stable. However there are some corner cases where
* inode lock is not held. So to be on the safe side and be reselient to future
* callers and out of tree users of d_delete(), we do not assume that d_parent
* and d_name are stable and we use dget_parent() and
* take_dentry_name_snapshot() to grab stable references.
*/
static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
{
struct dentry *parent;
struct name_snapshot name;
__u32 mask = FS_DELETE;
/* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */
if (IS_ROOT(dentry))
return;
if (isdir)
mask |= FS_ISDIR;
fsnotify_parent(NULL, dentry, mask);
parent = dget_parent(dentry);
take_dentry_name_snapshot(&name, dentry);
fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
name.name, 0);
release_dentry_name_snapshot(&name);
dput(parent);
}
/*
@ -144,7 +189,12 @@ static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
*/
static inline void fsnotify_inoderemove(struct inode *inode)
{
fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
__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);
}
@ -155,7 +205,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
{
audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
fsnotify_dirent(inode, dentry, FS_CREATE);
}
/*
@ -176,12 +226,9 @@ static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct
*/
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(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
}
/*

67
include/linux/fsnotify_backend.h
View File

@ -59,27 +59,33 @@
* dnotify and inotify. */
#define FS_EVENT_ON_CHILD 0x08000000
/* This is a list of all events that may get sent to a parernt based on fs event
* happening to inodes inside that directory */
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM | \
FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
/*
* Directory entry modification events - reported only to directory
* where entry is modified and not to a watching parent.
* The watching parent may get an FS_ATTRIB|FS_EVENT_ON_CHILD event
* when a directory entry inside a child subdir changes.
*/
#define ALL_FSNOTIFY_DIRENT_EVENTS (FS_CREATE | FS_DELETE | FS_MOVE)
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
FS_OPEN_EXEC_PERM)
/*
* This is a list of all events that may get sent to a parent based on fs event
* happening to inodes inside that directory.
*/
#define FS_EVENTS_POSS_ON_CHILD (ALL_FSNOTIFY_PERM_EVENTS | \
FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | \
FS_OPEN | FS_OPEN_EXEC)
/* Events that can be reported to backends */
#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME | \
FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
#define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \
FS_EVENTS_POSS_ON_CHILD | \
FS_DELETE_SELF | FS_MOVE_SELF | FS_DN_RENAME | \
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED)
/* Extra flags that may be reported with event or control handling of events */
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
@ -129,7 +135,6 @@ struct fsnotify_event {
struct list_head list;
/* inode may ONLY be dereferenced during handle_event(). */
struct inode *inode; /* either the inode the event happened to or its parent */
u32 mask; /* the type of access, bitwise OR for FS_* event types */
};
/*
@ -288,6 +293,7 @@ typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
struct fsnotify_mark_connector {
spinlock_t lock;
unsigned int type; /* Type of object [lock] */
__kernel_fsid_t fsid; /* fsid of filesystem containing object */
union {
/* Object pointer [lock] */
fsnotify_connp_t *obj;
@ -416,6 +422,9 @@ extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
/* return AND dequeue the first event on the notification queue */
extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
/* Remove event queued in the notification list */
extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
struct fsnotify_event *event);
/* functions used to manipulate the marks attached to inodes */
@ -428,28 +437,35 @@ extern void fsnotify_init_mark(struct fsnotify_mark *mark,
/* Find mark belonging to given group in the list of marks */
extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
struct fsnotify_group *group);
/* Get cached fsid of filesystem containing object */
extern int fsnotify_get_conn_fsid(const struct fsnotify_mark_connector *conn,
__kernel_fsid_t *fsid);
/* 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);
int allow_dups, __kernel_fsid_t *fsid);
extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups);
fsnotify_connp_t *connp,
unsigned int type, int allow_dups,
__kernel_fsid_t *fsid);
/* 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);
FSNOTIFY_OBJ_TYPE_INODE, allow_dups, NULL);
}
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);
FSNOTIFY_OBJ_TYPE_INODE, allow_dups,
NULL);
}
/* 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);
@ -479,9 +495,12 @@ extern void fsnotify_put_mark(struct fsnotify_mark *mark);
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);
static inline void fsnotify_init_event(struct fsnotify_event *event,
struct inode *inode)
{
INIT_LIST_HEAD(&event->list);
event->inode = inode;
}
#else

3
include/linux/statfs.h
View File

@ -41,4 +41,7 @@ struct kstatfs {
#define ST_NODIRATIME 0x0800 /* do not update directory access times */
#define ST_RELATIME 0x1000 /* update atime relative to mtime/ctime */
struct dentry;
extern int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid);
#endif

29
include/uapi/linux/fanotify.h
View File

@ -7,9 +7,16 @@
/* the following events that user-space can register for */
#define FAN_ACCESS 0x00000001 /* File was accessed */
#define FAN_MODIFY 0x00000002 /* File was modified */
#define FAN_ATTRIB 0x00000004 /* Metadata changed */
#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
#define FAN_OPEN 0x00000020 /* File was opened */
#define FAN_MOVED_FROM 0x00000040 /* File was moved from X */
#define FAN_MOVED_TO 0x00000080 /* File was moved to Y */
#define FAN_CREATE 0x00000100 /* Subfile was created */
#define FAN_DELETE 0x00000200 /* Subfile was deleted */
#define FAN_DELETE_SELF 0x00000400 /* Self was deleted */
#define FAN_MOVE_SELF 0x00000800 /* Self was moved */
#define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
@ -24,6 +31,7 @@
/* helper events */
#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
#define FAN_MOVE (FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */
/* flags used for fanotify_init() */
#define FAN_CLOEXEC 0x00000001
@ -44,6 +52,7 @@
/* Flags to determine fanotify event format */
#define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */
#define FAN_REPORT_FID 0x00000200 /* Report unique file id */
/* Deprecated - do not use this in programs and do not add new flags here! */
#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
@ -106,6 +115,26 @@ struct fanotify_event_metadata {
__s32 pid;
};
#define FAN_EVENT_INFO_TYPE_FID 1
/* Variable length info record following event metadata */
struct fanotify_event_info_header {
__u8 info_type;
__u8 pad;
__u16 len;
};
/* Unique file identifier info record */
struct fanotify_event_info_fid {
struct fanotify_event_info_header hdr;
__kernel_fsid_t fsid;
/*
* Following is an opaque struct file_handle that can be passed as
* an argument to open_by_handle_at(2).
*/
unsigned char handle[0];
};
struct fanotify_response {
__s32 fd;
__u32 response;