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Commit 9fd4b9fc authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4.x/pnfs: Fix a race between layoutget and bulk recalls 



Replace another case where the layout 'plh_block_lgets' can trigger
infinite loops in send_layoutget().

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 2454dfea

fs/nfs/pnfs.c

+6 −11
Original line number Diff line number Diff line
@@ -259,7 +259,7 @@ pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 
 * is required.

 * Note that caller must hold inode->i_lock.

 */

static void

static int

pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,

		struct list_head *lseg_list)

{
@@ -270,7 +270,7 @@ pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 
	};



	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);

	pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range);

	return pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range);

}



static int
@@ -637,11 +637,6 @@ pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 
{

	struct pnfs_layout_hdr *lo;

	struct inode *inode;

	struct pnfs_layout_range range = {

		.iomode = IOMODE_ANY,

		.offset = 0,

		.length = NFS4_MAX_UINT64,

	};

	LIST_HEAD(lseg_list);

	int ret = 0;
@@ -656,11 +651,11 @@ pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 


		spin_lock(&inode->i_lock);

		list_del_init(&lo->plh_bulk_destroy);

		lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */

		if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {

			if (is_bulk_recall)

				set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);

		if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))

			ret = -EAGAIN;

		}

		spin_unlock(&inode->i_lock);

		pnfs_free_lseg_list(&lseg_list);

		/* Free all lsegs that are attached to commit buckets */