Preparing for changes in pnfs_clear_lseg_list
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxx>
---
fs/nfs/pnfs.c | 37 ++++++++++++++-----------------------
fs/nfs/pnfs.h | 5 +++--
2 files changed, 17 insertions(+), 25 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 519055d..8e699fd 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -266,41 +266,32 @@ static void
init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
{
INIT_LIST_HEAD(&lseg->fi_list);
- kref_init(&lseg->kref);
+ atomic_set(&lseg->pls_refcount, 1);
+ smp_mb();
lseg->valid = true;
lseg->layout = lo;
}
-/* Called without i_lock held, as the free_lseg call may sleep */
-static void
-destroy_lseg(struct kref *kref)
-{
- struct pnfs_layout_segment *lseg =
- container_of(kref, struct pnfs_layout_segment, kref);
- struct inode *ino = lseg->layout->inode;
-
- dprintk("--> %s\n", __func__);
- NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
- /* Matched by get_layout_hdr_locked in pnfs_insert_layout */
- put_layout_hdr(ino);
-}
-
void
put_lseg(struct pnfs_layout_segment *lseg)
{
bool do_wake_up;
- struct nfs_inode *nfsi;
+ struct inode *ino;
if (!lseg)
return;
dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
- atomic_read(&lseg->kref.refcount), lseg->valid);
+ atomic_read(&lseg->pls_refcount), lseg->valid);
do_wake_up = !lseg->valid;
- nfsi = NFS_I(lseg->layout->inode);
- kref_put(&lseg->kref, destroy_lseg);
+ ino = lseg->layout->inode;
+ if (atomic_dec_and_test(&lseg->pls_refcount)) {
+ NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
+ /* Matched by get_layout_hdr_locked in pnfs_insert_layout */
+ put_layout_hdr(ino);
+ }
if (do_wake_up)
- rpc_wake_up(&nfsi->lo_rpcwaitq);
+ rpc_wake_up(&NFS_I(ino)->lo_rpcwaitq);
}
EXPORT_SYMBOL_GPL(put_lseg);
@@ -326,7 +317,7 @@ should_free_lseg(struct pnfs_layout_range *lseg_range,
static bool
_pnfs_can_return_lseg(struct pnfs_layout_segment *lseg)
{
- return atomic_read(&lseg->kref.refcount) == 1;
+ return atomic_read(&lseg->pls_refcount) == 1;
}
static void
@@ -554,7 +545,7 @@ pnfs_return_layout_barrier(struct nfs_inode *nfsi,
if (!_pnfs_can_return_lseg(lseg)) {
dprintk("%s: wait on lseg %p refcount %d\n",
__func__, lseg,
- atomic_read(&lseg->kref.refcount));
+ atomic_read(&lseg->pls_refcount));
ret = true;
}
}
@@ -812,7 +803,7 @@ pnfs_has_layout(struct pnfs_layout_hdr *lo,
}
dprintk("%s:Return lseg %p ref %d valid %d\n",
- __func__, ret, ret ? atomic_read(&ret->kref.refcount) : 0,
+ __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0,
ret ? ret->valid : 0);
return ret;
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index fdcfb9b..ee5a752 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -35,7 +35,7 @@
struct pnfs_layout_segment {
struct list_head fi_list;
struct pnfs_layout_range range;
- struct kref kref;
+ atomic_t pls_refcount;
bool valid;
struct pnfs_layout_hdr *layout;
};
@@ -228,7 +228,8 @@ static inline void pnfs_invalidate_layout_stateid(struct pnfs_layout_hdr *lo)
static inline void get_lseg(struct pnfs_layout_segment *lseg)
{
- kref_get(&lseg->kref);
+ atomic_inc(&lseg->pls_refcount);
+ smp_mb__after_atomic_inc();
}
/* Return true if a layout driver is being used for this mountpoint */
--
1.7.2.1
--
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