This is a note to let you know that I've just added the patch titled
NFSD: Refactor __nfsd_file_close_inode()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-refactor-__nfsd_file_close_inode.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 43df3ca8cdb29103a7af61c71afe815c87403be5
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Fri Jul 8 14:25:57 2022 -0400
NFSD: Refactor __nfsd_file_close_inode()
[ Upstream commit a845511007a63467fee575353c706806c21218b1 ]
The code that computes the hashval is the same in both callers.
To prevent them from going stale, reframe the documenting comments
to remove descriptions of the underlying hash table structure, which
is about to be replaced.
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index d7c74b51eabf3..3925df9124c39 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -558,39 +558,44 @@ static struct shrinker nfsd_file_shrinker = {
.seeks = 1,
};
-static void
-__nfsd_file_close_inode(struct inode *inode, unsigned int hashval,
- struct list_head *dispose)
+/*
+ * Find all cache items across all net namespaces that match @inode and
+ * move them to @dispose. The lookup is atomic wrt nfsd_file_acquire().
+ */
+static unsigned int
+__nfsd_file_close_inode(struct inode *inode, struct list_head *dispose)
{
+ unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
+ NFSD_FILE_HASH_BITS);
+ unsigned int count = 0;
struct nfsd_file *nf;
struct hlist_node *tmp;
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
hlist_for_each_entry_safe(nf, tmp, &nfsd_file_hashtbl[hashval].nfb_head, nf_node) {
- if (inode == nf->nf_inode)
+ if (inode == nf->nf_inode) {
nfsd_file_unhash_and_release_locked(nf, dispose);
+ count++;
+ }
}
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
+ return count;
}
/**
* nfsd_file_close_inode_sync - attempt to forcibly close a nfsd_file
* @inode: inode of the file to attempt to remove
*
- * Walk the whole hash bucket, looking for any files that correspond to "inode".
- * If any do, then unhash them and put the hashtable reference to them and
- * destroy any that had their last reference put. Also ensure that any of the
- * fputs also have their final __fput done as well.
+ * Unhash and put, then flush and fput all cache items associated with @inode.
*/
void
nfsd_file_close_inode_sync(struct inode *inode)
{
- unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
- NFSD_FILE_HASH_BITS);
LIST_HEAD(dispose);
+ unsigned int count;
- __nfsd_file_close_inode(inode, hashval, &dispose);
- trace_nfsd_file_close_inode_sync(inode, !list_empty(&dispose));
+ count = __nfsd_file_close_inode(inode, &dispose);
+ trace_nfsd_file_close_inode_sync(inode, count);
nfsd_file_dispose_list_sync(&dispose);
}
@@ -598,19 +603,16 @@ nfsd_file_close_inode_sync(struct inode *inode)
* nfsd_file_close_inode - attempt a delayed close of a nfsd_file
* @inode: inode of the file to attempt to remove
*
- * Walk the whole hash bucket, looking for any files that correspond to "inode".
- * If any do, then unhash them and put the hashtable reference to them and
- * destroy any that had their last reference put.
+ * Unhash and put all cache item associated with @inode.
*/
static void
nfsd_file_close_inode(struct inode *inode)
{
- unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
- NFSD_FILE_HASH_BITS);
LIST_HEAD(dispose);
+ unsigned int count;
- __nfsd_file_close_inode(inode, hashval, &dispose);
- trace_nfsd_file_close_inode(inode, !list_empty(&dispose));
+ count = __nfsd_file_close_inode(inode, &dispose);
+ trace_nfsd_file_close_inode(inode, count);
nfsd_file_dispose_list_delayed(&dispose);
}
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 0d20075406c78..9a91684b09951 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -847,30 +847,52 @@ TRACE_EVENT(nfsd_file_open,
DECLARE_EVENT_CLASS(nfsd_file_search_class,
TP_PROTO(
- struct inode *inode,
- int found
+ const struct inode *inode,
+ unsigned int count
),
- TP_ARGS(inode, found),
+ TP_ARGS(inode, count),
TP_STRUCT__entry(
- __field(struct inode *, inode)
- __field(int, found)
+ __field(const struct inode *, inode)
+ __field(unsigned int, count)
),
TP_fast_assign(
__entry->inode = inode;
- __entry->found = found;
+ __entry->count = count;
),
- TP_printk("inode=%p found=%d",
- __entry->inode, __entry->found)
+ TP_printk("inode=%p count=%u",
+ __entry->inode, __entry->count)
);
#define DEFINE_NFSD_FILE_SEARCH_EVENT(name) \
DEFINE_EVENT(nfsd_file_search_class, name, \
- TP_PROTO(struct inode *inode, int found), \
- TP_ARGS(inode, found))
+ TP_PROTO( \
+ const struct inode *inode, \
+ unsigned int count \
+ ), \
+ TP_ARGS(inode, count))
DEFINE_NFSD_FILE_SEARCH_EVENT(nfsd_file_close_inode_sync);
DEFINE_NFSD_FILE_SEARCH_EVENT(nfsd_file_close_inode);
-DEFINE_NFSD_FILE_SEARCH_EVENT(nfsd_file_is_cached);
+
+TRACE_EVENT(nfsd_file_is_cached,
+ TP_PROTO(
+ const struct inode *inode,
+ int found
+ ),
+ TP_ARGS(inode, found),
+ TP_STRUCT__entry(
+ __field(const struct inode *, inode)
+ __field(int, found)
+ ),
+ TP_fast_assign(
+ __entry->inode = inode;
+ __entry->found = found;
+ ),
+ TP_printk("inode=%p is %scached",
+ __entry->inode,
+ __entry->found ? "" : "not "
+ )
+);
TRACE_EVENT(nfsd_file_fsnotify_handle_event,
TP_PROTO(struct inode *inode, u32 mask),
