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Commit 24956804 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4.1: Always clear the NFS_INO_LAYOUTCOMMIT in layoutreturn 



Note that clearing NFS_INO_LAYOUTCOMMIT is tricky, since it requires
you to also clear the NFS_LSEG_LAYOUTCOMMIT bits from the layout
segments.
The only two sites that need to do this are the ones that call
pnfs_return_layout() without first doing a layout commit.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: default avatarBenny Halevy <bhalevy@tonian.com>
Cc: stable@vger.kernel.org
parent a073dbff

fs/nfs/nfs4filelayout.c

+0 −1
Original line number Diff line number Diff line
@@ -129,7 +129,6 @@ static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo) 
{

	if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))

		return;

	clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);

	pnfs_return_layout(inode);

}

fs/nfs/pnfs.c

+27 −8
Original line number Diff line number Diff line
@@ -417,6 +417,16 @@ should_free_lseg(struct pnfs_layout_range *lseg_range, 
	       lo_seg_intersecting(lseg_range, recall_range);

}



static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,

		struct list_head *tmp_list)

{

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

		return false;

	pnfs_layout_remove_lseg(lseg->pls_layout, lseg);

	list_add(&lseg->pls_list, tmp_list);

	return true;

}



/* Returns 1 if lseg is removed from list, 0 otherwise */

static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,

			     struct list_head *tmp_list)
@@ -430,12 +440,9 @@ static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 
		 */

		dprintk("%s: lseg %p ref %d\n", __func__, lseg,

			atomic_read(&lseg->pls_refcount));

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

			pnfs_layout_remove_lseg(lseg->pls_layout, lseg);

			list_add(&lseg->pls_list, tmp_list);

		if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))

			rv = 1;

	}

	}

	return rv;

}
@@ -777,6 +784,21 @@ send_layoutget(struct pnfs_layout_hdr *lo, 
	return lseg;

}



static void pnfs_clear_layoutcommit(struct inode *inode,

		struct list_head *head)

{

	struct nfs_inode *nfsi = NFS_I(inode);

	struct pnfs_layout_segment *lseg, *tmp;



	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))

		return;

	list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {

		if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))

			continue;

		pnfs_lseg_dec_and_remove_zero(lseg, head);

	}

}



/*

 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr

 * when the layout segment list is empty.
@@ -808,6 +830,7 @@ _pnfs_return_layout(struct inode *ino) 
	/* Reference matched in nfs4_layoutreturn_release */

	pnfs_get_layout_hdr(lo);

	empty = list_empty(&lo->plh_segs);

	pnfs_clear_layoutcommit(ino, &tmp_list);

	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);

	/* Don't send a LAYOUTRETURN if list was initially empty */

	if (empty) {
@@ -820,8 +843,6 @@ _pnfs_return_layout(struct inode *ino) 
	spin_unlock(&ino->i_lock);

	pnfs_free_lseg_list(&tmp_list);



	WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));



	lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);

	if (unlikely(lrp == NULL)) {

		status = -ENOMEM;
@@ -1458,7 +1479,6 @@ static void pnfs_ld_handle_write_error(struct nfs_write_data *data) 
	dprintk("pnfs write error = %d\n", hdr->pnfs_error);

	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &

	    PNFS_LAYOUTRET_ON_ERROR) {

		clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);

		pnfs_return_layout(hdr->inode);

	}

	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
@@ -1613,7 +1633,6 @@ static void pnfs_ld_handle_read_error(struct nfs_read_data *data) 
	dprintk("pnfs read error = %d\n", hdr->pnfs_error);

	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &

	    PNFS_LAYOUTRET_ON_ERROR) {

		clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);

		pnfs_return_layout(hdr->inode);

	}

	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))