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fsnotify: put inode specific fields in an fsnotify_mark in a union 

The addition of marks on vfs mounts will be simplified if the inode
specific parts of a mark and the vfsmnt specific parts of a mark are
actually in a union so naming can be easy.  This patch just implements the
inode struct and the union.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 21:24:23 -05:00
parent 3a9fb89f4c
commit 2823e04de4
6 changed files with 43 additions and 34 deletions
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4
fs/notify/dnotify/dnotify.c
View File

@ -70,8 +70,8 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark_entry *entry)
if (old_mask == new_mask)
return;
if (entry->inode)
fsnotify_recalc_inode_mask(entry->inode);
if (entry->i.inode)
fsnotify_recalc_inode_mask(entry->i.inode);
}
/*

28
fs/notify/inode_mark.c
View File

@ -117,7 +117,7 @@ static void fsnotify_recalc_inode_mask_locked(struct inode *inode)
assert_spin_locked(&inode->i_lock);
hlist_for_each_entry(entry, pos, &inode->i_fsnotify_mark_entries, i_list)
hlist_for_each_entry(entry, pos, &inode->i_fsnotify_mark_entries, i.i_list)
new_mask |= entry->mask;
inode->i_fsnotify_mask = new_mask;
}
@ -148,7 +148,7 @@ void fsnotify_destroy_mark_by_entry(struct fsnotify_mark_entry *entry)
spin_lock(&entry->lock);
group = entry->group;
inode = entry->inode;
inode = entry->i.inode;
BUG_ON(group && !inode);
BUG_ON(!group && inode);
@ -165,8 +165,8 @@ void fsnotify_destroy_mark_by_entry(struct fsnotify_mark_entry *entry)
spin_lock(&group->mark_lock);
spin_lock(&inode->i_lock);
hlist_del_init(&entry->i_list);
entry->inode = NULL;
hlist_del_init(&entry->i.i_list);
entry->i.inode = NULL;
list_del_init(&entry->g_list);
entry->group = NULL;
@ -248,14 +248,14 @@ void fsnotify_clear_marks_by_inode(struct inode *inode)
LIST_HEAD(free_list);
spin_lock(&inode->i_lock);
hlist_for_each_entry_safe(entry, pos, n, &inode->i_fsnotify_mark_entries, i_list) {
list_add(&entry->free_i_list, &free_list);
hlist_del_init(&entry->i_list);
hlist_for_each_entry_safe(entry, pos, n, &inode->i_fsnotify_mark_entries, i.i_list) {
list_add(&entry->i.free_i_list, &free_list);
hlist_del_init(&entry->i.i_list);
fsnotify_get_mark(entry);
}
spin_unlock(&inode->i_lock);
list_for_each_entry_safe(entry, lentry, &free_list, free_i_list) {
list_for_each_entry_safe(entry, lentry, &free_list, i.free_i_list) {
fsnotify_destroy_mark_by_entry(entry);
fsnotify_put_mark(entry);
}
@ -273,7 +273,7 @@ struct fsnotify_mark_entry *fsnotify_find_mark_entry(struct fsnotify_group *grou
assert_spin_locked(&inode->i_lock);
hlist_for_each_entry(entry, pos, &inode->i_fsnotify_mark_entries, i_list) {
hlist_for_each_entry(entry, pos, &inode->i_fsnotify_mark_entries, i.i_list) {
if (entry->group == group) {
fsnotify_get_mark(entry);
return entry;
@ -285,7 +285,7 @@ struct fsnotify_mark_entry *fsnotify_find_mark_entry(struct fsnotify_group *grou
void fsnotify_duplicate_mark(struct fsnotify_mark_entry *new, struct fsnotify_mark_entry *old)
{
assert_spin_locked(&old->lock);
new->inode = old->inode;
new->i.inode = old->i.inode;
new->group = old->group;
new->mask = old->mask;
new->free_mark = old->free_mark;
@ -299,10 +299,10 @@ void fsnotify_init_mark(struct fsnotify_mark_entry *entry,
{
spin_lock_init(&entry->lock);
atomic_set(&entry->refcnt, 1);
INIT_HLIST_NODE(&entry->i_list);
INIT_HLIST_NODE(&entry->i.i_list);
entry->group = NULL;
entry->mask = 0;
entry->inode = NULL;
entry->i.inode = NULL;
entry->free_mark = free_mark;
}
@ -350,9 +350,9 @@ int fsnotify_add_mark(struct fsnotify_mark_entry *entry,
lentry = fsnotify_find_mark_entry(group, inode);
if (!lentry) {
entry->group = group;
entry->inode = inode;
entry->i.inode = inode;
hlist_add_head(&entry->i_list, &inode->i_fsnotify_mark_entries);
hlist_add_head(&entry->i.i_list, &inode->i_fsnotify_mark_entries);
list_add(&entry->g_list, &group->mark_entries);
fsnotify_get_mark(entry); /* for i_list and g_list */

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

@ -193,7 +193,7 @@ static int idr_callback(int id, void *p, void *data)
*/
if (entry)
printk(KERN_WARNING "entry->group=%p inode=%p wd=%d\n",
entry->group, entry->inode, ientry->wd);
entry->group, entry->i.inode, ientry->wd);
return 0;
}

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

@ -445,7 +445,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (wd == -1) {
WARN_ONCE(1, "%s: ientry=%p ientry->wd=%d ientry->group=%p"
" ientry->inode=%p\n", __func__, ientry, ientry->wd,
ientry->fsn_entry.group, ientry->fsn_entry.inode);
ientry->fsn_entry.group, ientry->fsn_entry.i.inode);
goto out;
}
@ -454,7 +454,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (unlikely(!found_ientry)) {
WARN_ONCE(1, "%s: ientry=%p ientry->wd=%d ientry->group=%p"
" ientry->inode=%p\n", __func__, ientry, ientry->wd,
ientry->fsn_entry.group, ientry->fsn_entry.inode);
ientry->fsn_entry.group, ientry->fsn_entry.i.inode);
goto out;
}
@ -468,9 +468,9 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
"entry->inode=%p found_ientry=%p found_ientry->wd=%d "
"found_ientry->group=%p found_ientry->inode=%p\n",
__func__, ientry, ientry->wd, ientry->fsn_entry.group,
ientry->fsn_entry.inode, found_ientry, found_ientry->wd,
ientry->fsn_entry.i.inode, found_ientry, found_ientry->wd,
found_ientry->fsn_entry.group,
found_ientry->fsn_entry.inode);
found_ientry->fsn_entry.i.inode);
goto out;
}
@ -482,7 +482,7 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
if (unlikely(atomic_read(&ientry->fsn_entry.refcnt) < 3)) {
printk(KERN_ERR "%s: ientry=%p ientry->wd=%d ientry->group=%p"
" ientry->inode=%p\n", __func__, ientry, ientry->wd,
ientry->fsn_entry.group, ientry->fsn_entry.inode);
ientry->fsn_entry.group, ientry->fsn_entry.i.inode);
/* we can't really recover with bad ref cnting.. */
BUG();
}

17
include/linux/fsnotify_backend.h
View File

@ -226,6 +226,15 @@ struct fsnotify_event {
struct list_head private_data_list; /* groups can store private data here */
};
/*
* Inode specific fields in an fsnotify_mark_entry
*/
struct fsnotify_inode_mark {
struct inode *inode; /* inode this entry is associated with */
struct hlist_node i_list; /* list of mark_entries by inode->i_fsnotify_mark_entries */
struct list_head free_i_list; /* tmp list used when freeing this mark */
};
/*
* a mark is simply an entry attached to an in core inode which allows an
* fsnotify listener to indicate they are either no longer interested in events
@ -241,12 +250,12 @@ struct fsnotify_mark_entry {
/* we hold ref for each i_list and g_list. also one ref for each 'thing'
* in kernel that found and may be using this mark. */
atomic_t refcnt; /* active things looking at this mark */
struct inode *inode; /* inode this entry is associated with */
struct fsnotify_group *group; /* group this mark entry is for */
struct hlist_node i_list; /* list of mark_entries by inode->i_fsnotify_mark_entries */
struct list_head g_list; /* list of mark_entries by group->i_fsnotify_mark_entries */
spinlock_t lock; /* protect group, inode, and killme */
struct list_head free_i_list; /* tmp list used when freeing this mark */
spinlock_t lock; /* protect group and inode */
union {
struct fsnotify_inode_mark i;
};
struct list_head free_g_list; /* tmp list used when freeing this mark */
void (*free_mark)(struct fsnotify_mark_entry *entry); /* called on final put+free */
};

16
kernel/audit_tree.c
View File

@ -179,9 +179,9 @@ static void insert_hash(struct audit_chunk *chunk)
struct fsnotify_mark_entry *entry = &chunk->mark;
struct list_head *list;
if (!entry->inode)
if (!entry->i.inode)
return;
list = chunk_hash(entry->inode);
list = chunk_hash(entry->i.inode);
list_add_rcu(&chunk->hash, list);
}
@ -193,7 +193,7 @@ 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.inode == inode) {
if (p->mark.i.inode == inode) {
atomic_long_inc(&p->refs);
return p;
}
@ -233,7 +233,7 @@ static void untag_chunk(struct node *p)
spin_unlock(&hash_lock);
spin_lock(&entry->lock);
if (chunk->dead || !entry->inode) {
if (chunk->dead || !entry->i.inode) {
spin_unlock(&entry->lock);
goto out;
}
@ -259,7 +259,7 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
fsnotify_duplicate_mark(&new->mark, entry);
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.inode, 1)) {
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.i.inode, 1)) {
free_chunk(new);
goto Fallback;
}
@ -388,7 +388,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
chunk_entry = &chunk->mark;
spin_lock(&old_entry->lock);
if (!old_entry->inode) {
if (!old_entry->i.inode) {
/* old_entry is being shot, lets just lie */
spin_unlock(&old_entry->lock);
fsnotify_put_mark(old_entry);
@ -397,7 +397,7 @@ 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->inode, 1)) {
if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->i.inode, 1)) {
spin_unlock(&old_entry->lock);
free_chunk(chunk);
fsnotify_put_mark(old_entry);
@ -605,7 +605,7 @@ 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 dieing else where... */
struct inode *inode = chunk->mark.inode;
struct inode *inode = chunk->mark.i.inode;
node->index |= 1U<<31;
if (iterate_mounts(compare_root, inode, root_mnt))
node->index &= ~(1U<<31);