From: Andy Adamson <andros@xxxxxxxxxx>
Add a list of per clientid reference counted layout state structures (struct
nfs4_layout_state) to struct nfs4_file to track the layout stateid usage.
A struct nfs4_layout_state is created upon first LAYOUTGET operation from a
clientid on the file. Each successful LAYOUTGET from a clientid on the file
that adds a nfsd4_layout_seg bumps the struct nfs4_layout_state reference
count, and the nfsd4_layout_seg is added to the nfs4_layout_state
ls_state list.
LAYOUTRETURNS that remove nfsd4_layout_segs decrement the nfs4_layout_state
reference count. A struct nfs4_layout_state is reaped when its reference
count goes to zero and the ls_state list is empty.
A delegation stateid is identified by a zero si_fileid field, an open/lock
stateid has non-zero si_stateownerid and si_fileid field, a layout stateid
is identified by a zero si_stateownerid field. The layout stateid
si_fileid field is used (reset) as a uniqifier.
NOTE: A design point of this architecture was to leave the nfs4_file fi_layouts
list alone so as not to disturb server implementations just prior to
Connectathon. We might want to get rid of the fi_layouts list and just
use the fi_layout_state list.
Use a spin_lock rather than the state_lock mutex for protecting
the layout and layoutrecall state.
[Moved pnfsd code from nfs4state.c to nfs4pnfsd.c]
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[pnfsd: use a spinlock for layout state]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[removed nfs4_layout_lock and nfs4_layout_unlock]
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[pnfsd: Move pnfsd code out of nfs4state.c/h]
Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
[pnfsd: clean up layoutget export API]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfsd/nfs4pnfsd.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++--
fs/nfsd/nfs4state.c | 1 +
fs/nfsd/pnfsd.h | 12 ++++++
fs/nfsd/state.h | 1 +
4 files changed, 109 insertions(+), 4 deletions(-)
diff --git a/fs/nfsd/nfs4pnfsd.c b/fs/nfsd/nfs4pnfsd.c
index b0794e3..b02daad 100644
--- a/fs/nfsd/nfs4pnfsd.c
+++ b/fs/nfsd/nfs4pnfsd.c
@@ -25,11 +25,19 @@
#define NFSDDBG_FACILITY NFSDDBG_PROC
+/* Globals */
+static u32 current_layoutid = 1;
+
/*
* Layout state - NFSv4.1 pNFS
*/
static struct kmem_cache *pnfs_layout_slab;
+/*
+ * Currently used for manipulating the layout state.
+ */
+static DEFINE_SPINLOCK(layout_lock);
+
void
nfsd4_free_pnfs_slabs(void)
{
@@ -46,6 +54,80 @@ nfsd4_init_pnfs_slabs(void)
return 0;
}
+static struct nfs4_layout_state *
+alloc_init_layout_state(struct nfs4_client *clp, struct nfs4_file *fp,
+ stateid_t *stateid)
+{
+ struct nfs4_layout_state *new;
+
+ /* FIXME: use a kmem_cache */
+ new = kzalloc(sizeof(*new), GFP_KERNEL);
+ if (!new)
+ return new;
+ get_nfs4_file(fp);
+ INIT_LIST_HEAD(&new->ls_perfile);
+ INIT_LIST_HEAD(&new->ls_layouts);
+ kref_init(&new->ls_ref);
+ new->ls_client = clp;
+ new->ls_file = fp;
+ new->ls_stateid.si_boot = stateid->si_boot;
+ new->ls_stateid.si_stateownerid = 0; /* identifies layout stateid */
+ new->ls_stateid.si_generation = 1;
+ spin_lock(&layout_lock);
+ new->ls_stateid.si_fileid = current_layoutid++;
+ list_add(&new->ls_perfile, &fp->fi_layout_states);
+ spin_unlock(&layout_lock);
+ return new;
+}
+
+static inline void
+get_layout_state(struct nfs4_layout_state *ls)
+{
+ kref_get(&ls->ls_ref);
+}
+
+static void
+destroy_layout_state_common(struct nfs4_layout_state *ls)
+{
+ struct nfs4_file *fp = ls->ls_file;
+
+ dprintk("pNFS %s: ls %p fp %p clp %p\n", __func__, ls, fp,
+ ls->ls_client);
+ BUG_ON(!list_empty(&ls->ls_layouts));
+ kfree(ls);
+ put_nfs4_file(fp);
+}
+
+static void
+destroy_layout_state(struct kref *kref)
+{
+ struct nfs4_layout_state *ls =
+ container_of(kref, struct nfs4_layout_state, ls_ref);
+
+ spin_lock(&layout_lock);
+ list_del(&ls->ls_perfile);
+ spin_unlock(&layout_lock);
+ destroy_layout_state_common(ls);
+}
+
+static void
+destroy_layout_state_locked(struct kref *kref)
+{
+ struct nfs4_layout_state *ls =
+ container_of(kref, struct nfs4_layout_state, ls_ref);
+
+ list_del(&ls->ls_perfile);
+ destroy_layout_state_common(ls);
+}
+
+static inline void
+put_layout_state(struct nfs4_layout_state *ls)
+{
+ dprintk("pNFS %s: ls %p ls_ref %d\n", __func__, ls,
+ atomic_read(&ls->ls_ref.refcount));
+ kref_put(&ls->ls_ref, destroy_layout_state);
+}
+
static inline struct nfs4_layout *
alloc_layout(void)
{
@@ -59,21 +141,27 @@ free_layout(struct nfs4_layout *lp)
}
static void
-init_layout(struct nfs4_layout *lp,
+init_layout(struct nfs4_layout_state *ls,
+ struct nfs4_layout *lp,
struct nfs4_file *fp,
struct nfs4_client *clp,
struct svc_fh *current_fh,
struct nfsd4_layout_seg *seg)
{
- dprintk("pNFS %s: lp %p clp %p fp %p ino %p\n", __func__,
- lp, clp, fp, fp->fi_inode);
+ dprintk("pNFS %s: ls %p lp %p clp %p fp %p ino %p\n", __func__,
+ ls, lp, clp, fp, fp->fi_inode);
get_nfs4_file(fp);
lp->lo_client = clp;
lp->lo_file = fp;
+ get_layout_state(ls);
+ lp->lo_state = ls;
memcpy(&lp->lo_seg, seg, sizeof(lp->lo_seg));
+ spin_lock(&layout_lock);
+ list_add_tail(&lp->lo_perstate, &ls->ls_layouts);
list_add_tail(&lp->lo_perclnt, &clp->cl_layouts);
list_add_tail(&lp->lo_perfile, &fp->fi_layouts);
+ spin_unlock(&layout_lock);
dprintk("pNFS %s end\n", __func__);
}
@@ -159,6 +247,7 @@ merge_layout(struct nfs4_file *fp,
{
struct nfs4_layout *lp = NULL;
+ spin_lock(&layout_lock);
list_for_each_entry (lp, &fp->fi_layouts, lo_perfile)
if (lp->lo_seg.layout_type == seg->layout_type &&
lp->lo_seg.clientid == seg->clientid &&
@@ -167,6 +256,7 @@ merge_layout(struct nfs4_file *fp,
extend_layout(&lp->lo_seg, seg);
break;
}
+ spin_unlock(&layout_lock);
return lp;
}
@@ -182,6 +272,7 @@ nfs4_pnfs_get_layout(struct nfsd4_pnfs_layoutget *lgp,
struct nfs4_file *fp;
struct nfs4_client *clp;
struct nfs4_layout *lp = NULL;
+ struct nfs4_layout_state *ls = NULL;
struct nfsd4_pnfs_layoutget_arg args = {
.lg_minlength = lgp->lg_minlength,
.lg_fsid = lgp->lg_fhp->fh_export->ex_fsid,
@@ -259,7 +350,7 @@ nfs4_pnfs_get_layout(struct nfsd4_pnfs_layoutget *lgp,
goto out_freelayout;
/* Can't merge, so let's initialize this new layout */
- init_layout(lp, fp, clp, lgp->lg_fhp, &res.lg_seg);
+ init_layout(ls, lp, fp, clp, lgp->lg_fhp, &res.lg_seg);
out:
if (fp)
put_nfs4_file(fp);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index cea0edc..9646240 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1725,6 +1725,7 @@ alloc_init_file(struct inode *ino, struct svc_fh *current_fh)
INIT_LIST_HEAD(&fp->fi_delegations);
#if defined(CONFIG_PNFSD)
INIT_LIST_HEAD(&fp->fi_layouts);
+ INIT_LIST_HEAD(&fp->fi_layout_states);
#endif /* CONFIG_PNFSD */
spin_lock(&recall_lock);
list_add(&fp->fi_hash, &file_hashtbl[hashval]);
diff --git a/fs/nfsd/pnfsd.h b/fs/nfsd/pnfsd.h
index 04d713f..523b149 100644
--- a/fs/nfsd/pnfsd.h
+++ b/fs/nfsd/pnfsd.h
@@ -40,12 +40,24 @@
#include <state.h>
#include <xdr4.h>
+/* outstanding layout stateid */
+struct nfs4_layout_state {
+ struct list_head ls_perfile;
+ struct list_head ls_layouts; /* list of nfs4_layouts */
+ struct kref ls_ref;
+ struct nfs4_client *ls_client;
+ struct nfs4_file *ls_file;
+ stateid_t ls_stateid;
+};
+
/* outstanding layout */
struct nfs4_layout {
struct list_head lo_perfile; /* hash by f_id */
struct list_head lo_perclnt; /* hash by clientid */
+ struct list_head lo_perstate;
struct nfs4_file *lo_file; /* backpointer */
struct nfs4_client *lo_client;
+ struct nfs4_layout_state *lo_state;
struct nfsd4_layout_seg lo_seg;
};
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 44b25d2..23d62f4 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -328,6 +328,7 @@ struct nfs4_file {
struct list_head fi_delegations;
#if defined(CONFIG_PNFSD)
struct list_head fi_layouts;
+ struct list_head fi_layout_states;
#endif /* CONFIG_PNFSD */
struct inode *fi_inode;
u32 fi_id; /* used with stateowner->so_id
--
1.6.5.1
--
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