From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
If current lseg is the last lseg marked with NFS_LSEG_LAYOUTRETURN,
send layoutreturn.
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Tom Haynes <Thomas.Haynes@xxxxxxxxxxxxxxx>
---
fs/nfs/pnfs.c | 38 +++++++++++++++++++++++++++++++++++++-
1 file changed, 37 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 853b544..e9acfcf 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -50,6 +50,10 @@ static DEFINE_SPINLOCK(pnfs_spinlock);
*/
static LIST_HEAD(pnfs_modules_tbl);
+static int
+pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
+ enum pnfs_iomode iomode);
+
/* Return the registered pnfs layout driver module matching given id */
static struct pnfs_layoutdriver_type *
find_pnfs_driver_locked(u32 id)
@@ -337,6 +341,29 @@ pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
}
+/* Return true if layoutreturn is needed */
+static bool
+pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
+ struct pnfs_layout_segment *lseg,
+ nfs4_stateid *stateid, enum pnfs_iomode *iomode)
+{
+ struct pnfs_layout_segment *s;
+
+ if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
+ return false;
+
+ list_for_each_entry(s, &lo->plh_segs, pls_list)
+ if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
+ return false;
+
+ *stateid = lo->plh_stateid;
+ *iomode = lo->plh_return_iomode;
+ /* decreased in pnfs_send_layoutreturn() */
+ lo->plh_block_lgets++;
+ lo->plh_return_iomode = 0;
+ return true;
+}
+
void
pnfs_put_lseg(struct pnfs_layout_segment *lseg)
{
@@ -352,11 +379,20 @@ pnfs_put_lseg(struct pnfs_layout_segment *lseg)
lo = lseg->pls_layout;
inode = lo->plh_inode;
if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
+ bool need_return;
+ nfs4_stateid stateid;
+ enum pnfs_iomode iomode;
+
pnfs_get_layout_hdr(lo);
pnfs_layout_remove_lseg(lo, lseg);
+ need_return = pnfs_layout_need_return(lo, lseg,
+ &stateid, &iomode);
spin_unlock(&inode->i_lock);
pnfs_free_lseg(lseg);
- pnfs_put_layout_hdr(lo);
+ if (need_return)
+ pnfs_send_layoutreturn(lo, stateid, iomode);
+ else
+ pnfs_put_layout_hdr(lo);
}
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg);
--
1.9.3
--
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