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authorSachin Bhamare <sachin.bhamare@primarydata.com>2015-04-27 15:50:14 +0300
committerJ. Bruce Fields <bfields@redhat.com>2015-05-04 19:02:39 +0300
commit8287f009bd95a5e548059dba62a67727bb9549cd (patch)
tree12d451819b0e805fd86172cdb120cb77014c5e75 /fs/nfsd/state.h
parentebe9cb3bb13e7b9b281969cd279ce70834f7500f (diff)
downloadlinux-8287f009bd95a5e548059dba62a67727bb9549cd.tar.xz
nfsd: fix pNFS return on close semantics
For the sake of forgetful clients, the server should return the layouts to the file system on 'last close' of a file (assuming that there are no delegations outstanding to that particular client) or on delegreturn (assuming that there are no opens on a file from that particular client). In theory the information is all there in current data structures, but it's not efficiently available; nfs4_file->fi_ref includes references on the file across all clients, but we need a per-(client, file) count. Walking through lots of stateid's to calculate this on each close or delegreturn would be painful. This patch introduces infrastructure to maintain per-client opens and delegation counters on a per-file basis. [hch: ported to the mainline pNFS support, merged various fixes from Jeff] Signed-off-by: Sachin Bhamare <sachin.bhamare@primarydata.com> Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/state.h')
-rw-r--r--fs/nfsd/state.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 4f3bfeb11766..bde45d90b746 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -126,6 +126,7 @@ struct nfs4_delegation {
struct list_head dl_perfile;
struct list_head dl_perclnt;
struct list_head dl_recall_lru; /* delegation recalled */
+ struct nfs4_clnt_odstate *dl_clnt_odstate;
u32 dl_type;
time_t dl_time;
/* For recall: */
@@ -465,6 +466,17 @@ static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
}
/*
+ * Per-client state indicating no. of opens and outstanding delegations
+ * on a file from a particular client.'od' stands for 'open & delegation'
+ */
+struct nfs4_clnt_odstate {
+ struct nfs4_client *co_client;
+ struct nfs4_file *co_file;
+ struct list_head co_perfile;
+ atomic_t co_odcount;
+};
+
+/*
* nfs4_file: a file opened by some number of (open) nfs4_stateowners.
*
* These objects are global. nfsd keeps one instance of a nfs4_file per
@@ -485,6 +497,7 @@ struct nfs4_file {
struct list_head fi_delegations;
struct rcu_head fi_rcu;
};
+ struct list_head fi_clnt_odstate;
/* One each for O_RDONLY, O_WRONLY, O_RDWR: */
struct file * fi_fds[3];
/*
@@ -526,6 +539,7 @@ struct nfs4_ol_stateid {
struct list_head st_perstateowner;
struct list_head st_locks;
struct nfs4_stateowner * st_stateowner;
+ struct nfs4_clnt_odstate * st_clnt_odstate;
unsigned char st_access_bmap;
unsigned char st_deny_bmap;
struct nfs4_ol_stateid * st_openstp;