From f7f7e7a0635dedd5064fba255cb3facfa87b06d6 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Wed, 18 May 2016 20:31:55 +0800 Subject: ceph: improve fscache revalidation There are several issues in fscache revalidation code. - In ceph_revalidate_work(), fscache_invalidate() is called when fscache_check_consistency() return 0. This is complete wrong because 0 means cache is valid. - Handle_cap_grant() calls ceph_queue_revalidate() if client already has CAP_FILE_CACHE. This code is confusing. Client should revalidate the cache each time it got CAP_FILE_CACHE anew. - In Handle_cap_grant(), fscache_invalidate() is called if MDS revokes CAP_FILE_CACHE. This is inconsistency with the case that inode get evicted. In the later case, the cache is not discarded. Client may use the cache when inode is reloaded. This patch moves the fscache revalidation into ceph_get_caps(). Client revalidates the cache after it gets CAP_FILE_CACHE. i_rdcache_gen should keep constance while CAP_FILE_CACHE is used. If i_fscache_gen is not equal to i_rdcache_gen, client needs to check cache's consistency. Signed-off-by: Yan, Zheng --- fs/ceph/super.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'fs/ceph/super.h') diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 0130a8592191..0168b49fb6ad 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -103,7 +103,6 @@ struct ceph_fs_client { #ifdef CONFIG_CEPH_FSCACHE struct fscache_cookie *fscache; - struct workqueue_struct *revalidate_wq; #endif }; @@ -360,8 +359,7 @@ struct ceph_inode_info { #ifdef CONFIG_CEPH_FSCACHE struct fscache_cookie *fscache; - u32 i_fscache_gen; /* sequence, for delayed fscache validate */ - struct work_struct i_revalidate_work; + u32 i_fscache_gen; #endif struct inode vfs_inode; /* at end */ }; -- cgit v1.2.3