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inotify: move control flags from mask to mark flags

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The inotify control flags in the mark mask (e.g. FS_IN_ONE_SHOT) are not
relevant to object interest mask, so move them to the mark flags.

This frees up some bits in the object interest mask.

Link: https://lore.kernel.org/r/20220422120327.3459282-3-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2022-04-22 15:03:13 +03:00 committed by Jan Kara
parent a32e697cda
commit 38035c04f5
5 changed files with 45 additions and 26 deletions
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4
fs/notify/fsnotify.c
View file

@ -253,7 +253,7 @@ static int fsnotify_handle_inode_event(struct fsnotify_group *group,
if (WARN_ON_ONCE(!inode && !dir))
return 0;
if ((inode_mark->mask & FS_EXCL_UNLINK) &&
if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
path && d_unlinked(path->dentry))
return 0;
@ -581,7 +581,7 @@ static __init int fsnotify_init(void)
{
int ret;
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)

11
fs/notify/inotify/inotify.h
View file

@ -27,11 +27,18 @@ static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse)
* userspace. There is at least one bit (FS_EVENT_ON_CHILD) which is
* used only internally to the kernel.
*/
#define INOTIFY_USER_MASK (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)
#define INOTIFY_USER_MASK (IN_ALL_EVENTS)
static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
{
return fsn_mark->mask & INOTIFY_USER_MASK;
__u32 mask = fsn_mark->mask & INOTIFY_USER_MASK;
if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK)
mask |= IN_EXCL_UNLINK;
if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
mask |= IN_ONESHOT;
return mask;
}
extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,

2
fs/notify/inotify/inotify_fsnotify.c
View file

@ -122,7 +122,7 @@ int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, u32 mask,
fsnotify_destroy_event(group, fsn_event);
}
if (inode_mark->mask & IN_ONESHOT)
if (inode_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
fsnotify_destroy_mark(inode_mark, group);
return 0;

38
fs/notify/inotify/inotify_user.c
View file

@ -115,6 +115,21 @@ static inline __u32 inotify_arg_to_mask(struct inode *inode, u32 arg)
return mask;
}
#define INOTIFY_MARK_FLAGS \
(FSNOTIFY_MARK_FLAG_EXCL_UNLINK | FSNOTIFY_MARK_FLAG_IN_ONESHOT)
static inline unsigned int inotify_arg_to_flags(u32 arg)
{
unsigned int flags = 0;
if (arg & IN_EXCL_UNLINK)
flags |= FSNOTIFY_MARK_FLAG_EXCL_UNLINK;
if (arg & IN_ONESHOT)
flags |= FSNOTIFY_MARK_FLAG_IN_ONESHOT;
return flags;
}
static inline u32 inotify_mask_to_arg(__u32 mask)
{
return mask & (IN_ALL_EVENTS | IN_ISDIR | IN_UNMOUNT | IN_IGNORED |
@ -526,13 +541,10 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
struct fsnotify_mark *fsn_mark;
struct inotify_inode_mark *i_mark;
__u32 old_mask, new_mask;
__u32 mask;
int add = (arg & IN_MASK_ADD);
int replace = !(arg & IN_MASK_ADD);
int create = (arg & IN_MASK_CREATE);
int ret;
mask = inotify_arg_to_mask(inode, arg);
fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
if (!fsn_mark)
return -ENOENT;
@ -545,10 +557,12 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
spin_lock(&fsn_mark->lock);
old_mask = fsn_mark->mask;
if (add)
fsn_mark->mask |= mask;
else
fsn_mark->mask = mask;
if (replace) {
fsn_mark->mask = 0;
fsn_mark->flags &= ~INOTIFY_MARK_FLAGS;
}
fsn_mark->mask |= inotify_arg_to_mask(inode, arg);
fsn_mark->flags |= inotify_arg_to_flags(arg);
new_mask = fsn_mark->mask;
spin_unlock(&fsn_mark->lock);
@ -579,19 +593,17 @@ static int inotify_new_watch(struct fsnotify_group *group,
u32 arg)
{
struct inotify_inode_mark *tmp_i_mark;
__u32 mask;
int ret;
struct idr *idr = &group->inotify_data.idr;
spinlock_t *idr_lock = &group->inotify_data.idr_lock;
mask = inotify_arg_to_mask(inode, arg);
tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
if (unlikely(!tmp_i_mark))
return -ENOMEM;
fsnotify_init_mark(&tmp_i_mark->fsn_mark, group);
tmp_i_mark->fsn_mark.mask = mask;
tmp_i_mark->fsn_mark.mask = inotify_arg_to_mask(inode, arg);
tmp_i_mark->fsn_mark.flags = inotify_arg_to_flags(arg);
tmp_i_mark->wd = -1;
ret = inotify_add_to_idr(idr, idr_lock, tmp_i_mark);
@ -845,9 +857,7 @@ static int __init inotify_user_setup(void)
BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT);
BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW);
BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED);
BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK);
BUILD_BUG_ON(IN_ISDIR != FS_ISDIR);
BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
BUILD_BUG_ON(HWEIGHT32(ALL_INOTIFY_BITS) != 22);

16
include/linux/fsnotify_backend.h
View file

@ -55,7 +55,6 @@
#define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
#define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */
#define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
/*
* Set on inode mark that cares about things that happen to its children.
* Always set for dnotify and inotify.
@ -66,7 +65,6 @@
#define FS_RENAME 0x10000000 /* File was renamed */
#define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */
#define FS_ISDIR 0x40000000 /* event occurred against dir */
#define FS_IN_ONESHOT 0x80000000 /* only send event once */
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
@ -106,8 +104,7 @@
FS_ERROR)
/* 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 | \
FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
#define ALL_FSNOTIFY_FLAGS (FS_ISDIR | FS_EVENT_ON_CHILD | FS_DN_MULTISHOT)
#define ALL_FSNOTIFY_BITS (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS)
@ -473,9 +470,14 @@ struct fsnotify_mark {
struct fsnotify_mark_connector *connector;
/* Events types to ignore [mark->lock, group->mark_mutex] */
__u32 ignored_mask;
#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
#define FSNOTIFY_MARK_FLAG_ALIVE 0x02
#define FSNOTIFY_MARK_FLAG_ATTACHED 0x04
/* General fsnotify mark flags */
#define FSNOTIFY_MARK_FLAG_ALIVE 0x0001
#define FSNOTIFY_MARK_FLAG_ATTACHED 0x0002
/* inotify mark flags */
#define FSNOTIFY_MARK_FLAG_EXCL_UNLINK 0x0010
#define FSNOTIFY_MARK_FLAG_IN_ONESHOT 0x0020
/* fanotify mark flags */
#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x0100
unsigned int flags; /* flags [mark->lock] */
};