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fsnotify: let connector point to an abstract object

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Make the code to attach/detach a connector to object more generic
by letting the fsnotify connector point to an abstract fsnotify_connp_t.
Code that needs to dereference an inode or mount object now uses the
helpers fsnotify_conn_{inode,mount}.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-06-23 17:54:49 +03:00 committed by Jan Kara
parent b812a9f589
commit 36f10f55ff
5 changed files with 45 additions and 37 deletions
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8
fs/notify/fdinfo.c
View File

@ -15,7 +15,7 @@
#include <linux/exportfs.h>
#include "inotify/inotify.h"
#include "../fs/mount.h"
#include "fsnotify.h"
#if defined(CONFIG_PROC_FS)
@ -81,7 +81,7 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
inode = igrab(mark->connector->inode);
inode = igrab(fsnotify_conn_inode(mark->connector));
if (inode) {
/*
* IN_ALL_EVENTS represents all of the mask bits
@ -117,7 +117,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
inode = igrab(mark->connector->inode);
inode = igrab(fsnotify_conn_inode(mark->connector));
if (!inode)
return;
seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
@ -127,7 +127,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
seq_putc(m, '\n');
iput(inode);
} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
struct mount *mnt = real_mount(mark->connector->mnt);
struct mount *mnt = fsnotify_conn_mount(mark->connector);
seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);

10
fs/notify/fsnotify.h
View File

@ -9,14 +9,16 @@
#include "../mount.h"
static inline struct inode *fsnotify_obj_inode(fsnotify_connp_t *connp)
static inline struct inode *fsnotify_conn_inode(
struct fsnotify_mark_connector *conn)
{
return container_of(connp, struct inode, i_fsnotify_marks);
return container_of(conn->obj, struct inode, i_fsnotify_marks);
}
static inline struct mount *fsnotify_obj_mount(fsnotify_connp_t *connp)
static inline struct mount *fsnotify_conn_mount(
struct fsnotify_mark_connector *conn)
{
return container_of(connp, struct mount, mnt_fsnotify_marks);
return container_of(conn->obj, struct mount, mnt_fsnotify_marks);
}
/* destroy all events sitting in this groups notification queue */

32
fs/notify/mark.c
View File

@ -120,14 +120,14 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
new_mask |= mark->mask;
}
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
conn->inode->i_fsnotify_mask = new_mask;
fsnotify_conn_inode(conn)->i_fsnotify_mask = new_mask;
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
fsnotify_conn_mount(conn)->mnt_fsnotify_mask = new_mask;
}
/*
* Calculate mask of events for a list of marks. The caller must make sure
* connector and connector->inode cannot disappear under us. Callers achieve
* connector and connector->obj cannot disappear under us. Callers achieve
* this by holding a mark->lock or mark->group->mark_mutex for a mark on this
* list.
*/
@ -140,7 +140,8 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
__fsnotify_recalc_mask(conn);
spin_unlock(&conn->lock);
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
__fsnotify_update_child_dentry_flags(conn->inode);
__fsnotify_update_child_dentry_flags(
fsnotify_conn_inode(conn));
}
/* Free all connectors queued for freeing once SRCU period ends */
@ -166,20 +167,20 @@ static struct inode *fsnotify_detach_connector_from_object(
{
struct inode *inode = NULL;
if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED)
return NULL;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) {
inode = conn->inode;
rcu_assign_pointer(inode->i_fsnotify_marks, NULL);
inode = fsnotify_conn_inode(conn);
inode->i_fsnotify_mask = 0;
conn->inode = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
rcu_assign_pointer(real_mount(conn->mnt)->mnt_fsnotify_marks,
NULL);
real_mount(conn->mnt)->mnt_fsnotify_mask = 0;
conn->mnt = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0;
}
rcu_assign_pointer(*(conn->obj), NULL);
conn->obj = NULL;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
return inode;
}
@ -448,10 +449,9 @@ static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
spin_lock_init(&conn->lock);
INIT_HLIST_HEAD(&conn->list);
conn->type = type;
conn->obj = connp;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
inode = conn->inode = igrab(fsnotify_obj_inode(connp));
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
conn->mnt = &fsnotify_obj_mount(connp)->mnt;
inode = igrab(fsnotify_conn_inode(conn));
/*
* cmpxchg() provides the barrier so that readers of *connp can see
* only initialized structure

15
include/linux/fsnotify_backend.h
View File

@ -255,6 +255,13 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
#define fsnotify_foreach_obj_type(type) \
for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
/*
* fsnotify_connp_t is what we embed in objects which connector can be attached
* to. fsnotify_connp_t * is how we refer from connector back to object.
*/
struct fsnotify_mark_connector;
typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
/*
* Inode / vfsmount point to this structure which tracks all marks attached to
* the inode / vfsmount. The reference to inode / vfsmount is held by this
@ -264,17 +271,15 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
struct fsnotify_mark_connector {
spinlock_t lock;
unsigned int type; /* Type of object [lock] */
union { /* Object pointer [lock] */
struct inode *inode;
struct vfsmount *mnt;
union {
/* Object pointer [lock] */
fsnotify_connp_t *obj;
/* Used listing heads to free after srcu period expires */
struct fsnotify_mark_connector *destroy_next;
};
struct hlist_head list;
};
typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
/*
* A mark is simply an object attached to an in core inode which allows an
* fsnotify listener to indicate they are either no longer interested in events

17
kernel/audit_tree.c
View File

@ -168,7 +168,8 @@ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(hash_lock);
/* Function to return search key in our hash from inode. */
static unsigned long inode_to_key(const struct inode *inode)
{
return (unsigned long)inode;
/* Use address pointed to by connector->obj as the key */
return (unsigned long)&inode->i_fsnotify_marks;
}
/*
@ -183,7 +184,7 @@ static unsigned long chunk_to_key(struct audit_chunk *chunk)
*/
if (WARN_ON_ONCE(!chunk->mark.connector))
return 0;
return (unsigned long)chunk->mark.connector->inode;
return (unsigned long)chunk->mark.connector->obj;
}
static inline struct list_head *chunk_hash(unsigned long key)
@ -258,7 +259,7 @@ static void untag_chunk(struct node *p)
spin_lock(&entry->lock);
/*
* mark_mutex protects mark from getting detached and thus also from
* mark->connector->inode getting NULL.
* mark->connector->obj getting NULL.
*/
if (chunk->dead || !(entry->flags & FSNOTIFY_MARK_FLAG_ATTACHED)) {
spin_unlock(&entry->lock);
@ -288,8 +289,8 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
if (fsnotify_add_inode_mark_locked(&new->mark, entry->connector->inode,
1)) {
if (fsnotify_add_mark_locked(&new->mark, entry->connector->obj,
FSNOTIFY_OBJ_TYPE_INODE, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@ -423,7 +424,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
spin_lock(&old_entry->lock);
/*
* mark_mutex protects mark from getting detached and thus also from
* mark->connector->inode getting NULL.
* mark->connector->obj getting NULL.
*/
if (!(old_entry->flags & FSNOTIFY_MARK_FLAG_ATTACHED)) {
/* old_entry is being shot, lets just lie */
@ -434,8 +435,8 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
return -ENOENT;
}
if (fsnotify_add_inode_mark_locked(chunk_entry,
old_entry->connector->inode, 1)) {
if (fsnotify_add_mark_locked(chunk_entry, old_entry->connector->obj,
FSNOTIFY_OBJ_TYPE_INODE, 1)) {
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_put_mark(chunk_entry);