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Commit 5d538483 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'nfs-for-3.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs 

Pull NFS client bugfixes from Trond Myklebust:
 - Fix an NFSv4 idmapper regression
 - Fix an Oops in the pNFS blocks client
 - Fix up various issues with pNFS layoutcommit
 - Ensure correct read ordering of variables in
   rpc_wake_up_task_queue_locked

* tag 'nfs-for-3.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: Add barriers to ensure read ordering in rpc_wake_up_task_queue_locked
  NFSv4.1: Add a helper pnfs_commit_and_return_layout
  NFSv4.1: Always clear the NFS_INO_LAYOUTCOMMIT in layoutreturn
  NFSv4.1: Fix a race in pNFS layoutcommit
  pnfs-block: removing DM device maybe cause oops when call dev_remove
  NFSv4: Fix the string length returned by the idmapper
parents a12183c6 1166fde6

fs/nfs/blocklayout/blocklayoutdm.c

+2 −2
Original line number Diff line number Diff line
@@ -55,7 +55,8 @@ static void dev_remove(struct net *net, dev_t dev) 


	bl_pipe_msg.bl_wq = &nn->bl_wq;

	memset(msg, 0, sizeof(*msg));

	msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);

	msg->len = sizeof(bl_msg) + bl_msg.totallen;

	msg->data = kzalloc(msg->len, GFP_NOFS);

	if (!msg->data)

		goto out;
@@ -66,7 +67,6 @@ static void dev_remove(struct net *net, dev_t dev) 
	memcpy(msg->data, &bl_msg, sizeof(bl_msg));

	dataptr = (uint8_t *) msg->data;

	memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));

	msg->len = sizeof(bl_msg) + bl_msg.totallen;



	add_wait_queue(&nn->bl_wq, &wq);

	if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {

fs/nfs/idmap.c

+8 −5
Original line number Diff line number Diff line
@@ -726,9 +726,9 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons, 
	return ret;

}



static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)

static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)

{

	return key_instantiate_and_link(key, data, strlen(data) + 1,

	return key_instantiate_and_link(key, data, datalen,

					id_resolver_cache->thread_keyring,

					authkey);

}
@@ -738,6 +738,7 @@ static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, 
		struct key *key, struct key *authkey)

{

	char id_str[NFS_UINT_MAXLEN];

	size_t len;

	int ret = -ENOKEY;



	/* ret = -ENOKEY */
@@ -747,13 +748,15 @@ static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, 
	case IDMAP_CONV_NAMETOID:

		if (strcmp(upcall->im_name, im->im_name) != 0)

			break;

		sprintf(id_str, "%d", im->im_id);

		ret = nfs_idmap_instantiate(key, authkey, id_str);

		/* Note: here we store the NUL terminator too */

		len = sprintf(id_str, "%d", im->im_id) + 1;

		ret = nfs_idmap_instantiate(key, authkey, id_str, len);

		break;

	case IDMAP_CONV_IDTONAME:

		if (upcall->im_id != im->im_id)

			break;

		ret = nfs_idmap_instantiate(key, authkey, im->im_name);

		len = strlen(im->im_name);

		ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);

		break;

	default:

		ret = -EINVAL;

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/nfs4proc.c

+1 −15
Original line number Diff line number Diff line
@@ -2632,7 +2632,7 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 
	int status;



	if (pnfs_ld_layoutret_on_setattr(inode))

		pnfs_return_layout(inode);

		pnfs_commit_and_return_layout(inode);



	nfs_fattr_init(fattr);
@@ -6416,22 +6416,8 @@ nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 
static void nfs4_layoutcommit_release(void *calldata)

{

	struct nfs4_layoutcommit_data *data = calldata;

	struct pnfs_layout_segment *lseg, *tmp;

	unsigned long *bitlock = &NFS_I(data->args.inode)->flags;



	pnfs_cleanup_layoutcommit(data);

	/* Matched by references in pnfs_set_layoutcommit */

	list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {

		list_del_init(&lseg->pls_lc_list);

		if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,

				       &lseg->pls_flags))

			pnfs_put_lseg(lseg);

	}



	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);

	smp_mb__after_clear_bit();

	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);



	put_rpccred(data->cred);

	kfree(data);

}

fs/nfs/pnfs.c

+72 −9
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;
@@ -845,6 +866,33 @@ _pnfs_return_layout(struct inode *ino) 
}

EXPORT_SYMBOL_GPL(_pnfs_return_layout);



int

pnfs_commit_and_return_layout(struct inode *inode)

{

	struct pnfs_layout_hdr *lo;

	int ret;



	spin_lock(&inode->i_lock);

	lo = NFS_I(inode)->layout;

	if (lo == NULL) {

		spin_unlock(&inode->i_lock);

		return 0;

	}

	pnfs_get_layout_hdr(lo);

	/* Block new layoutgets and read/write to ds */

	lo->plh_block_lgets++;

	spin_unlock(&inode->i_lock);

	filemap_fdatawait(inode->i_mapping);

	ret = pnfs_layoutcommit_inode(inode, true);

	if (ret == 0)

		ret = _pnfs_return_layout(inode);

	spin_lock(&inode->i_lock);

	lo->plh_block_lgets--;

	spin_unlock(&inode->i_lock);

	pnfs_put_layout_hdr(lo);

	return ret;

}



bool pnfs_roc(struct inode *ino)

{

	struct pnfs_layout_hdr *lo;
@@ -1458,7 +1506,6 @@ 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 +1660,6 @@ 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))
@@ -1746,11 +1792,27 @@ static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 


	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {

		if (lseg->pls_range.iomode == IOMODE_RW &&

		    test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))

		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))

			list_add(&lseg->pls_lc_list, listp);

	}

}



static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)

{

	struct pnfs_layout_segment *lseg, *tmp;

	unsigned long *bitlock = &NFS_I(inode)->flags;



	/* Matched by references in pnfs_set_layoutcommit */

	list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {

		list_del_init(&lseg->pls_lc_list);

		pnfs_put_lseg(lseg);

	}



	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);

	smp_mb__after_clear_bit();

	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);

}



void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)

{

	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
@@ -1795,6 +1857,7 @@ void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 


	if (nfss->pnfs_curr_ld->cleanup_layoutcommit)

		nfss->pnfs_curr_ld->cleanup_layoutcommit(data);

	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);

}



/*