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fsnotify: Free fsnotify_mark_connector when there is no mark attached

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Currently we free fsnotify_mark_connector structure only when inode /
vfsmount is getting freed. This can however impose noticeable memory
overhead when marks get attached to inodes only temporarily. So free the
connector structure once the last mark is detached from the object.
Since notification infrastructure can be working with the connector
under the protection of fsnotify_mark_srcu, we have to be careful and
free the fsnotify_mark_connector only after SRCU period passes.

Reviewed-by: Miklos Szeredi <[email protected]>
Reviewed-by: Amir Goldstein <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
This commit is contained in:
Jan Kara 2017-02-01 09:21:58 +01:00
commit 08991e83b7
11 changed files with 136 additions and 66 deletions
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6
kernel/auditsc.c
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@ -1597,8 +1597,7 @@ static inline void handle_one(const struct inode *inode)
struct audit_tree_refs *p;
struct audit_chunk *chunk;
int count;
if (likely(!inode->i_fsnotify_marks ||
hlist_empty(&inode->i_fsnotify_marks->list)))
if (likely(!inode->i_fsnotify_marks))
return;
context = current->audit_context;
p = context->trees;
@ -1641,8 +1640,7 @@ retry:
seq = read_seqbegin(&rename_lock);
for(;;) {
struct inode *inode = d_backing_inode(d);
if (inode && unlikely(inode->i_fsnotify_marks &&
!hlist_empty(&inode->i_fsnotify_marks->list))) {
if (inode && unlikely(inode->i_fsnotify_marks)) {
struct audit_chunk *chunk;
chunk = audit_tree_lookup(inode);
if (chunk) {