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Commit faa4a54f authored by Trond Myklebust's avatar Trond Myklebust
Browse files

pNFS: Don't throw out valid layout segments 



It is OK for layout segments to remain hashed even if no-one holds any
references to them, provided that the segments are still valid.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent bdc59cf2

fs/nfs/pnfs.c

+6 −0
Original line number Diff line number Diff line
@@ -422,6 +422,10 @@ pnfs_put_lseg(struct pnfs_layout_segment *lseg) 
		pnfs_layoutreturn_before_put_lseg(lseg, lo, inode);



	if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {

		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {

			spin_unlock(&inode->i_lock);

			return;

		}

		pnfs_get_layout_hdr(lo);

		pnfs_layout_remove_lseg(lo, lseg);

		spin_unlock(&inode->i_lock);
@@ -462,6 +466,8 @@ pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg) 
		test_bit(NFS_LSEG_VALID, &lseg->pls_flags));

	if (atomic_dec_and_test(&lseg->pls_refcount)) {

		struct pnfs_layout_hdr *lo = lseg->pls_layout;

		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))

			return;

		pnfs_get_layout_hdr(lo);

		pnfs_layout_remove_lseg(lo, lseg);

		pnfs_free_lseg_async(lseg);