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NFS: Correct timing for assigning access cache timestamp

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[ Upstream commit 21fd9e8700 ]

When the user's login time is newer than the cache's timestamp,
the original entry in the RB-tree will be replaced by a new entry.
Currently, the timestamp is only set if the entry is not found in
the RB-tree, which can cause the timestamp to be undefined when
the entry exists. This may result in a significant increase in
ACCESS operations if the timestamp is set to zero.

Signed-off-by: Chengen Du <chengen.du@canonical.com>
Fixes: 0eb43812c0 ("NFS: Clear the file access cache upon login”)
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chengen Du 2023-03-08 16:03:27 +08:00 committed by Greg Kroah-Hartman
parent 89ab36bb8b
commit 90f2b0b417
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/dir.c
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@ -3089,7 +3089,6 @@ static void nfs_access_add_rbtree(struct inode *inode,
else
goto found;
}
set->timestamp = ktime_get_ns();
rb_link_node(&set->rb_node, parent, p);
rb_insert_color(&set->rb_node, root_node);
list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
@ -3114,6 +3113,7 @@ void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set,
cache->fsgid = cred->fsgid;
cache->group_info = get_group_info(cred->group_info);
cache->mask = set->mask;
cache->timestamp = ktime_get_ns();
/* The above field assignments must be visible
* before this item appears on the lru. We cannot easily