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fsnotify: unify inode and mount marks handling

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There's a lot of common code in inode and mount marks handling.  Factor it
out to a common helper function.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Eric Paris <eparis@redhat.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2014-12-12 16:58:36 -08:00 committed by Linus Torvalds
parent 820c12d5d6
commit 0809ab69a2
11 changed files with 160 additions and 229 deletions
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4
fs/notify/dnotify/dnotify.c
View File

@ -69,8 +69,8 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
if (old_mask == new_mask)
return;
if (fsn_mark->i.inode)
fsnotify_recalc_inode_mask(fsn_mark->i.inode);
if (fsn_mark->inode)
fsnotify_recalc_inode_mask(fsn_mark->inode);
}
/*

6
fs/notify/fdinfo.c
View File

@ -80,7 +80,7 @@ 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->i.inode);
inode = igrab(mark->inode);
if (inode) {
seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
@ -112,7 +112,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = igrab(mark->i.inode);
inode = igrab(mark->inode);
if (!inode)
return;
seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
@ -122,7 +122,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
seq_putc(m, '\n');
iput(inode);
} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
struct mount *mnt = real_mount(mark->m.mnt);
struct mount *mnt = real_mount(mark->mnt);
seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);

4
fs/notify/fsnotify.c
View File

@ -242,13 +242,13 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
if (inode_node) {
inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu),
struct fsnotify_mark, i.i_list);
struct fsnotify_mark, obj_list);
inode_group = inode_mark->group;
}
if (vfsmount_node) {
vfsmount_mark = hlist_entry(srcu_dereference(vfsmount_node, &fsnotify_mark_srcu),
struct fsnotify_mark, m.m_list);
struct fsnotify_mark, obj_list);
vfsmount_group = vfsmount_mark->group;
}

12
fs/notify/fsnotify.h
View File

@ -12,12 +12,19 @@ extern void fsnotify_flush_notify(struct fsnotify_group *group);
/* protects reads of inode and vfsmount marks list */
extern struct srcu_struct fsnotify_mark_srcu;
/* Calculate mask of events for a list of marks */
extern u32 fsnotify_recalc_mask(struct hlist_head *head);
/* compare two groups for sorting of marks lists */
extern int fsnotify_compare_groups(struct fsnotify_group *a,
struct fsnotify_group *b);
extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
__u32 mask);
/* Add mark to a proper place in mark list */
extern int fsnotify_add_mark_list(struct hlist_head *head,
struct fsnotify_mark *mark,
int allow_dups);
/* add a mark to an inode */
extern int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct inode *inode,
@ -31,6 +38,11 @@ extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
extern void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark);
/* inode specific destruction of a mark */
extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
/* Destroy all marks in the given list */
extern void fsnotify_destroy_marks(struct list_head *to_free);
/* Find mark belonging to given group in the list of marks */
extern struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
struct fsnotify_group *group);
/* run the list of all marks associated with inode and flag them to be freed */
extern void fsnotify_clear_marks_by_inode(struct inode *inode);
/* run the list of all marks associated with vfsmount and flag them to be freed */

113
fs/notify/inode_mark.c
View File

@ -30,21 +30,6 @@
#include "../internal.h"
/*
* Recalculate the mask of events relevant to a given inode locked.
*/
static void fsnotify_recalc_inode_mask_locked(struct inode *inode)
{
struct fsnotify_mark *mark;
__u32 new_mask = 0;
assert_spin_locked(&inode->i_lock);
hlist_for_each_entry(mark, &inode->i_fsnotify_marks, i.i_list)
new_mask |= mark->mask;
inode->i_fsnotify_mask = new_mask;
}
/*
* Recalculate the inode->i_fsnotify_mask, or the mask of all FS_* event types
* any notifier is interested in hearing for this inode.
@ -52,7 +37,7 @@ static void fsnotify_recalc_inode_mask_locked(struct inode *inode)
void fsnotify_recalc_inode_mask(struct inode *inode)
{
spin_lock(&inode->i_lock);
fsnotify_recalc_inode_mask_locked(inode);
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
__fsnotify_update_child_dentry_flags(inode);
@ -60,23 +45,22 @@ void fsnotify_recalc_inode_mask(struct inode *inode)
void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
{
struct inode *inode = mark->i.inode;
struct inode *inode = mark->inode;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&inode->i_lock);
hlist_del_init_rcu(&mark->i.i_list);
mark->i.inode = NULL;
hlist_del_init_rcu(&mark->obj_list);
mark->inode = NULL;
/*
* this mark is now off the inode->i_fsnotify_marks list and we
* hold the inode->i_lock, so this is the perfect time to update the
* inode->i_fsnotify_mask
*/
fsnotify_recalc_inode_mask_locked(inode);
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
}
@ -85,30 +69,19 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
*/
void fsnotify_clear_marks_by_inode(struct inode *inode)
{
struct fsnotify_mark *mark, *lmark;
struct fsnotify_mark *mark;
struct hlist_node *n;
LIST_HEAD(free_list);
spin_lock(&inode->i_lock);
hlist_for_each_entry_safe(mark, n, &inode->i_fsnotify_marks, i.i_list) {
list_add(&mark->i.free_i_list, &free_list);
hlist_del_init_rcu(&mark->i.i_list);
hlist_for_each_entry_safe(mark, n, &inode->i_fsnotify_marks, obj_list) {
list_add(&mark->free_list, &free_list);
hlist_del_init_rcu(&mark->obj_list);
fsnotify_get_mark(mark);
}
spin_unlock(&inode->i_lock);
list_for_each_entry_safe(mark, lmark, &free_list, i.free_i_list) {
struct fsnotify_group *group;
spin_lock(&mark->lock);
fsnotify_get_group(mark->group);
group = mark->group;
spin_unlock(&mark->lock);
fsnotify_destroy_mark(mark, group);
fsnotify_put_mark(mark);
fsnotify_put_group(group);
}
fsnotify_destroy_marks(&free_list);
}
/*
@ -119,27 +92,6 @@ void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_INODE);
}
/*
* given a group and inode, find the mark associated with that combination.
* if found take a reference to that mark and return it, else return NULL
*/
static struct fsnotify_mark *fsnotify_find_inode_mark_locked(
struct fsnotify_group *group,
struct inode *inode)
{
struct fsnotify_mark *mark;
assert_spin_locked(&inode->i_lock);
hlist_for_each_entry(mark, &inode->i_fsnotify_marks, i.i_list) {
if (mark->group == group) {
fsnotify_get_mark(mark);
return mark;
}
}
return NULL;
}
/*
* given a group and inode, find the mark associated with that combination.
* if found take a reference to that mark and return it, else return NULL
@ -150,7 +102,7 @@ struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
struct fsnotify_mark *mark;
spin_lock(&inode->i_lock);
mark = fsnotify_find_inode_mark_locked(group, inode);
mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
spin_unlock(&inode->i_lock);
return mark;
@ -168,10 +120,10 @@ void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark,
assert_spin_locked(&mark->lock);
if (mask &&
mark->i.inode &&
mark->inode &&
!(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) {
mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED;
inode = igrab(mark->i.inode);
inode = igrab(mark->inode);
/*
* we shouldn't be able to get here if the inode wasn't
* already safely held in memory. But bug in case it
@ -192,9 +144,7 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct inode *inode,
int allow_dups)
{
struct fsnotify_mark *lmark, *last = NULL;
int ret = 0;
int cmp;
int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
@ -202,37 +152,10 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
assert_spin_locked(&mark->lock);
spin_lock(&inode->i_lock);
mark->i.inode = inode;
/* is mark the first mark? */
if (hlist_empty(&inode->i_fsnotify_marks)) {
hlist_add_head_rcu(&mark->i.i_list, &inode->i_fsnotify_marks);
goto out;
}
/* should mark be in the middle of the current list? */
hlist_for_each_entry(lmark, &inode->i_fsnotify_marks, i.i_list) {
last = lmark;
if ((lmark->group == group) && !allow_dups) {
ret = -EEXIST;
goto out;
}
cmp = fsnotify_compare_groups(lmark->group, mark->group);
if (cmp < 0)
continue;
hlist_add_before_rcu(&mark->i.i_list, &lmark->i.i_list);
goto out;
}
BUG_ON(last == NULL);
/* mark should be the last entry. last is the current last entry */
hlist_add_behind_rcu(&mark->i.i_list, &last->i.i_list);
out:
fsnotify_recalc_inode_mask_locked(inode);
mark->inode = inode;
ret = fsnotify_add_mark_list(&inode->i_fsnotify_marks, mark,
allow_dups);
inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
return ret;

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

@ -156,7 +156,7 @@ static int idr_callback(int id, void *p, void *data)
*/
if (fsn_mark)
printk(KERN_WARNING "fsn_mark->group=%p inode=%p wd=%d\n",
fsn_mark->group, fsn_mark->i.inode, i_mark->wd);
fsn_mark->group, fsn_mark->inode, i_mark->wd);
return 0;
}

10
fs/notify/inotify/inotify_user.c
View File

@ -433,7 +433,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (wd == -1) {
WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
" i_mark->inode=%p\n", __func__, i_mark, i_mark->wd,
i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode);
i_mark->fsn_mark.group, i_mark->fsn_mark.inode);
goto out;
}
@ -442,7 +442,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (unlikely(!found_i_mark)) {
WARN_ONCE(1, "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
" i_mark->inode=%p\n", __func__, i_mark, i_mark->wd,
i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode);
i_mark->fsn_mark.group, i_mark->fsn_mark.inode);
goto out;
}
@ -456,9 +456,9 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
"mark->inode=%p found_i_mark=%p found_i_mark->wd=%d "
"found_i_mark->group=%p found_i_mark->inode=%p\n",
__func__, i_mark, i_mark->wd, i_mark->fsn_mark.group,
i_mark->fsn_mark.i.inode, found_i_mark, found_i_mark->wd,
i_mark->fsn_mark.inode, found_i_mark, found_i_mark->wd,
found_i_mark->fsn_mark.group,
found_i_mark->fsn_mark.i.inode);
found_i_mark->fsn_mark.inode);
goto out;
}
@ -470,7 +470,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (unlikely(atomic_read(&i_mark->fsn_mark.refcnt) < 3)) {
printk(KERN_ERR "%s: i_mark=%p i_mark->wd=%d i_mark->group=%p"
" i_mark->inode=%p\n", __func__, i_mark, i_mark->wd,
i_mark->fsn_mark.group, i_mark->fsn_mark.i.inode);
i_mark->fsn_mark.group, i_mark->fsn_mark.inode);
/* we can't really recover with bad ref cnting.. */
BUG();
}

89
fs/notify/mark.c
View File

@ -110,6 +110,17 @@ void fsnotify_put_mark(struct fsnotify_mark *mark)
}
}
/* Calculate mask of events for a list of marks */
u32 fsnotify_recalc_mask(struct hlist_head *head)
{
u32 new_mask = 0;
struct fsnotify_mark *mark;
hlist_for_each_entry(mark, head, obj_list)
new_mask |= mark->mask;
return new_mask;
}
/*
* Any time a mark is getting freed we end up here.
* The caller had better be holding a reference to this mark so we don't actually
@ -133,7 +144,7 @@ void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
mark->flags &= ~FSNOTIFY_MARK_FLAG_ALIVE;
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = mark->i.inode;
inode = mark->inode;
fsnotify_destroy_inode_mark(mark);
} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT)
fsnotify_destroy_vfsmount_mark(mark);
@ -192,6 +203,27 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark,
mutex_unlock(&group->mark_mutex);
}
/*
* Destroy all marks in the given list. The marks must be already detached from
* the original inode / vfsmount.
*/
void fsnotify_destroy_marks(struct list_head *to_free)
{
struct fsnotify_mark *mark, *lmark;
struct fsnotify_group *group;
list_for_each_entry_safe(mark, lmark, to_free, free_list) {
spin_lock(&mark->lock);
fsnotify_get_group(mark->group);
group = mark->group;
spin_unlock(&mark->lock);
fsnotify_destroy_mark(mark, group);
fsnotify_put_mark(mark);
fsnotify_put_group(group);
}
}
void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
{
assert_spin_locked(&mark->lock);
@ -245,6 +277,39 @@ int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b)
return -1;
}
/* Add mark into proper place in given list of marks */
int fsnotify_add_mark_list(struct hlist_head *head, struct fsnotify_mark *mark,
int allow_dups)
{
struct fsnotify_mark *lmark, *last = NULL;
int cmp;
/* is mark the first mark? */
if (hlist_empty(head)) {
hlist_add_head_rcu(&mark->obj_list, head);
return 0;
}
/* should mark be in the middle of the current list? */
hlist_for_each_entry(lmark, head, obj_list) {
last = lmark;
if ((lmark->group == mark->group) && !allow_dups)
return -EEXIST;
cmp = fsnotify_compare_groups(lmark->group, mark->group);
if (cmp >= 0) {
hlist_add_before_rcu(&mark->obj_list, &lmark->obj_list);
return 0;
}
}
BUG_ON(last == NULL);
/* mark should be the last entry. last is the current last entry */
hlist_add_behind_rcu(&mark->obj_list, &last->obj_list);
return 0;
}
/*
* Attach an initialized mark to a given group and fs object.
* These marks may be used for the fsnotify backend to determine which
@ -322,6 +387,24 @@ int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
return ret;
}
/*
* Given a list of marks, find the mark associated with given group. If found
* take a reference to that mark and return it, else return NULL.
*/
struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
struct fsnotify_group *group)
{
struct fsnotify_mark *mark;
hlist_for_each_entry(mark, head, obj_list) {
if (mark->group == group) {
fsnotify_get_mark(mark);
return mark;
}
}
return NULL;
}
/*
* clear any marks in a group in which mark->flags & flags is true
*/
@ -352,8 +435,8 @@ void fsnotify_clear_marks_by_group(struct fsnotify_group *group)
void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old)
{
assert_spin_locked(&old->lock);
new->i.inode = old->i.inode;
new->m.mnt = old->m.mnt;
new->inode = old->inode;
new->mnt = old->mnt;
if (old->group)
fsnotify_get_group(old->group);
new->group = old->group;

109
fs/notify/vfsmount_mark.c
View File

@ -32,31 +32,20 @@
void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
{
struct fsnotify_mark *mark, *lmark;
struct fsnotify_mark *mark;
struct hlist_node *n;
struct mount *m = real_mount(mnt);
LIST_HEAD(free_list);
spin_lock(&mnt->mnt_root->d_lock);
hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, m.m_list) {
list_add(&mark->m.free_m_list, &free_list);
hlist_del_init_rcu(&mark->m.m_list);
hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, obj_list) {
list_add(&mark->free_list, &free_list);
hlist_del_init_rcu(&mark->obj_list);
fsnotify_get_mark(mark);
}
spin_unlock(&mnt->mnt_root->d_lock);
list_for_each_entry_safe(mark, lmark, &free_list, m.free_m_list) {
struct fsnotify_group *group;
spin_lock(&mark->lock);
fsnotify_get_group(mark->group);
group = mark->group;
spin_unlock(&mark->lock);
fsnotify_destroy_mark(mark, group);
fsnotify_put_mark(mark);
fsnotify_put_group(group);
}
fsnotify_destroy_marks(&free_list);
}
void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
@ -64,67 +53,36 @@ void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT);
}
/*
* Recalculate the mask of events relevant to a given vfsmount locked.
*/
static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt)
{
struct mount *m = real_mount(mnt);
struct fsnotify_mark *mark;
__u32 new_mask = 0;
assert_spin_locked(&mnt->mnt_root->d_lock);
hlist_for_each_entry(mark, &m->mnt_fsnotify_marks, m.m_list)
new_mask |= mark->mask;
m->mnt_fsnotify_mask = new_mask;
}
/*
* Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types
* any notifier is interested in hearing for this mount point
*/
void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt)
{
struct mount *m = real_mount(mnt);
spin_lock(&mnt->mnt_root->d_lock);
fsnotify_recalc_vfsmount_mask_locked(mnt);
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
}
void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
{
struct vfsmount *mnt = mark->m.mnt;
struct vfsmount *mnt = mark->mnt;
struct mount *m = real_mount(mnt);
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&mnt->mnt_root->d_lock);
hlist_del_init_rcu(&mark->m.m_list);
mark->m.mnt = NULL;
fsnotify_recalc_vfsmount_mask_locked(mnt);
hlist_del_init_rcu(&mark->obj_list);
mark->mnt = NULL;
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
}
static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_group *group,
struct vfsmount *mnt)
{
struct mount *m = real_mount(mnt);
struct fsnotify_mark *mark;
assert_spin_locked(&mnt->mnt_root->d_lock);
hlist_for_each_entry(mark, &m->mnt_fsnotify_marks, m.m_list) {
if (mark->group == group) {
fsnotify_get_mark(mark);
return mark;
}
}
return NULL;
}
/*
* given a group and vfsmount, find the mark associated with that combination.
* if found take a reference to that mark and return it, else return NULL
@ -132,10 +90,11 @@ static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_
struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group,
struct vfsmount *mnt)
{
struct mount *m = real_mount(mnt);
struct fsnotify_mark *mark;
spin_lock(&mnt->mnt_root->d_lock);
mark = fsnotify_find_vfsmount_mark_locked(group, mnt);
mark = fsnotify_find_mark(&m->mnt_fsnotify_marks, group);
spin_unlock(&mnt->mnt_root->d_lock);
return mark;
@ -151,9 +110,7 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
int allow_dups)
{
struct mount *m = real_mount(mnt);
struct fsnotify_mark *lmark, *last = NULL;
int ret = 0;
int cmp;
int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
@ -161,37 +118,9 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
assert_spin_locked(&mark->lock);
spin_lock(&mnt->mnt_root->d_lock);
mark->m.mnt = mnt;
/* is mark the first mark? */
if (hlist_empty(&m->mnt_fsnotify_marks)) {
hlist_add_head_rcu(&mark->m.m_list, &m->mnt_fsnotify_marks);
goto out;
}
/* should mark be in the middle of the current list? */
hlist_for_each_entry(lmark, &m->mnt_fsnotify_marks, m.m_list) {
last = lmark;
if ((lmark->group == group) && !allow_dups) {
ret = -EEXIST;
goto out;
}
cmp = fsnotify_compare_groups(lmark->group, mark->group);
if (cmp < 0)
continue;
hlist_add_before_rcu(&mark->m.m_list, &lmark->m.m_list);
goto out;
}
BUG_ON(last == NULL);
/* mark should be the last entry. last is the current last entry */
hlist_add_behind_rcu(&mark->m.m_list, &last->m.m_list);
out:
fsnotify_recalc_vfsmount_mask_locked(mnt);
mark->mnt = mnt;
ret = fsnotify_add_mark_list(&m->mnt_fsnotify_marks, mark, allow_dups);
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
return ret;

24
include/linux/fsnotify_backend.h
View File

@ -196,24 +196,6 @@ struct fsnotify_group {
#define FSNOTIFY_EVENT_PATH 1
#define FSNOTIFY_EVENT_INODE 2
/*
* Inode specific fields in an fsnotify_mark
*/
struct fsnotify_inode_mark {
struct inode *inode; /* inode this mark is associated with */
struct hlist_node i_list; /* list of marks by inode->i_fsnotify_marks */
struct list_head free_i_list; /* tmp list used when freeing this mark */
};
/*
* Mount point specific fields in an fsnotify_mark
*/
struct fsnotify_vfsmount_mark {
struct vfsmount *mnt; /* vfsmount this mark is associated with */
struct hlist_node m_list; /* list of marks by inode->i_fsnotify_marks */
struct list_head free_m_list; /* tmp list used when freeing this mark */
};
/*
* 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
@ -232,9 +214,11 @@ struct fsnotify_mark {
struct fsnotify_group *group; /* group this mark is for */
struct list_head g_list; /* list of marks by group->i_fsnotify_marks */
spinlock_t lock; /* protect group and inode */
struct hlist_node obj_list; /* list of marks for inode / vfsmount */
struct list_head free_list; /* tmp list used when freeing this mark */
union {
struct fsnotify_inode_mark i;
struct fsnotify_vfsmount_mark m;
struct inode *inode; /* inode this mark is associated with */
struct vfsmount *mnt; /* vfsmount this mark is associated with */
};
__u32 ignored_mask; /* events types to ignore */
#define FSNOTIFY_MARK_FLAG_INODE 0x01

16
kernel/audit_tree.c
View File

@ -174,9 +174,9 @@ static void insert_hash(struct audit_chunk *chunk)
struct fsnotify_mark *entry = &chunk->mark;
struct list_head *list;
if (!entry->i.inode)
if (!entry->inode)
return;
list = chunk_hash(entry->i.inode);
list = chunk_hash(entry->inode);
list_add_rcu(&chunk->hash, list);
}
@ -188,7 +188,7 @@ struct audit_chunk *audit_tree_lookup(const struct inode *inode)
list_for_each_entry_rcu(p, list, hash) {
/* mark.inode may have gone NULL, but who cares? */
if (p->mark.i.inode == inode) {
if (p->mark.inode == inode) {
atomic_long_inc(&p->refs);
return p;
}
@ -231,7 +231,7 @@ static void untag_chunk(struct node *p)
new = alloc_chunk(size);
spin_lock(&entry->lock);
if (chunk->dead || !entry->i.inode) {
if (chunk->dead || !entry->inode) {
spin_unlock(&entry->lock);
if (new)
free_chunk(new);
@ -258,7 +258,7 @@ static void untag_chunk(struct node *p)
goto Fallback;
fsnotify_duplicate_mark(&new->mark, entry);
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.i.inode, NULL, 1)) {
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.inode, NULL, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@ -386,7 +386,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
chunk_entry = &chunk->mark;
spin_lock(&old_entry->lock);
if (!old_entry->i.inode) {
if (!old_entry->inode) {
/* old_entry is being shot, lets just lie */
spin_unlock(&old_entry->lock);
fsnotify_put_mark(old_entry);
@ -395,7 +395,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
}
fsnotify_duplicate_mark(chunk_entry, old_entry);
if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->i.inode, NULL, 1)) {
if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->inode, NULL, 1)) {
spin_unlock(&old_entry->lock);
fsnotify_put_mark(chunk_entry);
fsnotify_put_mark(old_entry);
@ -611,7 +611,7 @@ void audit_trim_trees(void)
list_for_each_entry(node, &tree->chunks, list) {
struct audit_chunk *chunk = find_chunk(node);
/* this could be NULL if the watch is dying else where... */
struct inode *inode = chunk->mark.i.inode;
struct inode *inode = chunk->mark.inode;
node->index |= 1U<<31;
if (iterate_mounts(compare_root, inode, root_mnt))
node->index &= ~(1U<<31);