xfs: use GFP_KERNEL in pure transaction contexts

When running in a transaction context, memory allocations are scoped to GFP_NOFS. Hence we don't need to use GFP_NOFS contexts in pure transaction context allocations - GFP_KERNEL will automatically get converted to GFP_NOFS as appropriate. Go through the code and convert all the obvious GFP_NOFS allocations in transaction context to use GFP_KERNEL. This further reduces the explicit use of GFP_NOFS in XFS. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
mariux64 · Feb 13, 2024 · 0b3a76e · 0b3a76e
1 parent 94a69db
commit 0b3a76e
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Showing 12 changed files with 39 additions and 31 deletions.
diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
@@ -891,7 +891,8 @@ xfs_attr_defer_add(
 
 	struct xfs_attr_intent	*new;
 
-	new = kmem_cache_zalloc(xfs_attr_intent_cache, GFP_NOFS | __GFP_NOFAIL);
+	new = kmem_cache_zalloc(xfs_attr_intent_cache,
+			GFP_KERNEL | __GFP_NOFAIL);
 	new->xattri_op_flags = op_flags;
 	new->xattri_da_args = args;
 

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
@@ -6098,7 +6098,7 @@ __xfs_bmap_add(
 			bmap->br_blockcount,
 			bmap->br_state);
 
-	bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_NOFS | __GFP_NOFAIL);
+	bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_KERNEL | __GFP_NOFAIL);
 	INIT_LIST_HEAD(&bi->bi_list);
 	bi->bi_type = type;
 	bi->bi_owner = ip;

diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
@@ -825,7 +825,7 @@ xfs_defer_alloc(
 	struct xfs_defer_pending	*dfp;
 
 	dfp = kmem_cache_zalloc(xfs_defer_pending_cache,
-			GFP_NOFS | __GFP_NOFAIL);
+			GFP_KERNEL | __GFP_NOFAIL);
 	dfp->dfp_ops = ops;
 	INIT_LIST_HEAD(&dfp->dfp_work);
 	list_add_tail(&dfp->dfp_list, &tp->t_dfops);
@@ -888,7 +888,7 @@ xfs_defer_start_recovery(
 	struct xfs_defer_pending	*dfp;
 
 	dfp = kmem_cache_zalloc(xfs_defer_pending_cache,
-			GFP_NOFS | __GFP_NOFAIL);
+			GFP_KERNEL | __GFP_NOFAIL);
 	dfp->dfp_ops = ops;
 	dfp->dfp_intent = lip;
 	INIT_LIST_HEAD(&dfp->dfp_work);
@@ -979,7 +979,7 @@ xfs_defer_ops_capture(
 		return ERR_PTR(error);
 
 	/* Create an object to capture the defer ops. */
-	dfc = kzalloc(sizeof(*dfc), GFP_NOFS | __GFP_NOFAIL);
+	dfc = kzalloc(sizeof(*dfc), GFP_KERNEL | __GFP_NOFAIL);
 	INIT_LIST_HEAD(&dfc->dfc_list);
 	INIT_LIST_HEAD(&dfc->dfc_dfops);
 

diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
@@ -236,7 +236,7 @@ xfs_dir_init(
 	if (error)
 		return error;
 
-	args = kzalloc(sizeof(*args), GFP_NOFS | __GFP_NOFAIL);
+	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
 	if (!args)
 		return -ENOMEM;
 
@@ -273,7 +273,7 @@ xfs_dir_createname(
 		XFS_STATS_INC(dp->i_mount, xs_dir_create);
 	}
 
-	args = kzalloc(sizeof(*args), GFP_NOFS | __GFP_NOFAIL);
+	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
 	if (!args)
 		return -ENOMEM;
 
@@ -435,7 +435,7 @@ xfs_dir_removename(
 	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
 	XFS_STATS_INC(dp->i_mount, xs_dir_remove);
 
-	args = kzalloc(sizeof(*args), GFP_NOFS | __GFP_NOFAIL);
+	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
 	if (!args)
 		return -ENOMEM;
 
@@ -496,7 +496,7 @@ xfs_dir_replace(
 	if (rval)
 		return rval;
 
-	args = kzalloc(sizeof(*args), GFP_NOFS | __GFP_NOFAIL);
+	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
 	if (!args)
 		return -ENOMEM;
 

diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -402,7 +402,7 @@ xfs_iroot_realloc(
 		if (ifp->if_broot_bytes == 0) {
 			new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, rec_diff);
 			ifp->if_broot = kmalloc(new_size,
-						GFP_NOFS | __GFP_NOFAIL);
+						GFP_KERNEL | __GFP_NOFAIL);
 			ifp->if_broot_bytes = (int)new_size;
 			return;
 		}
@@ -417,7 +417,7 @@ xfs_iroot_realloc(
 		new_max = cur_max + rec_diff;
 		new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
 		ifp->if_broot = krealloc(ifp->if_broot, new_size,
-					 GFP_NOFS | __GFP_NOFAIL);
+					 GFP_KERNEL | __GFP_NOFAIL);
 		op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
 						     ifp->if_broot_bytes);
 		np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
@@ -443,7 +443,7 @@ xfs_iroot_realloc(
 	else
 		new_size = 0;
 	if (new_size > 0) {
-		new_broot = kmalloc(new_size, GFP_NOFS | __GFP_NOFAIL);
+		new_broot = kmalloc(new_size, GFP_KERNEL | __GFP_NOFAIL);
 		/*
 		 * First copy over the btree block header.
 		 */
@@ -512,7 +512,7 @@ xfs_idata_realloc(
 
 	if (byte_diff) {
 		ifp->if_data = krealloc(ifp->if_data, new_size,
-					GFP_NOFS | __GFP_NOFAIL);
+					GFP_KERNEL | __GFP_NOFAIL);
 		if (new_size == 0)
 			ifp->if_data = NULL;
 		ifp->if_bytes = new_size;

diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
@@ -1449,7 +1449,7 @@ __xfs_refcount_add(
 			blockcount);
 
 	ri = kmem_cache_alloc(xfs_refcount_intent_cache,
-			GFP_NOFS | __GFP_NOFAIL);
+			GFP_KERNEL | __GFP_NOFAIL);
 	INIT_LIST_HEAD(&ri->ri_list);
 	ri->ri_type = type;
 	ri->ri_startblock = startblock;

diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c
@@ -2559,7 +2559,7 @@ __xfs_rmap_add(
 			bmap->br_blockcount,
 			bmap->br_state);
 
-	ri = kmem_cache_alloc(xfs_rmap_intent_cache, GFP_NOFS | __GFP_NOFAIL);
+	ri = kmem_cache_alloc(xfs_rmap_intent_cache, GFP_KERNEL | __GFP_NOFAIL);
 	INIT_LIST_HEAD(&ri->ri_list);
 	ri->ri_type = type;
 	ri->ri_owner = owner;

diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
@@ -226,7 +226,7 @@ xfs_attri_init(
 {
 	struct xfs_attri_log_item	*attrip;
 
-	attrip = kmem_cache_zalloc(xfs_attri_cache, GFP_NOFS | __GFP_NOFAIL);
+	attrip = kmem_cache_zalloc(xfs_attri_cache, GFP_KERNEL | __GFP_NOFAIL);
 
 	/*
 	 * Grab an extra reference to the name/value buffer for this log item.
@@ -666,7 +666,7 @@ xfs_attr_create_done(
 
 	attrip = ATTRI_ITEM(intent);
 
-	attrdp = kmem_cache_zalloc(xfs_attrd_cache, GFP_NOFS | __GFP_NOFAIL);
+	attrdp = kmem_cache_zalloc(xfs_attrd_cache, GFP_KERNEL | __GFP_NOFAIL);
 
 	xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
 			  &xfs_attrd_item_ops);

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
@@ -66,7 +66,7 @@ xfs_zero_extent(
 	return blkdev_issue_zeroout(target->bt_bdev,
 		block << (mp->m_super->s_blocksize_bits - 9),
 		count_fsb << (mp->m_super->s_blocksize_bits - 9),
-		GFP_NOFS, 0);
+		GFP_KERNEL, 0);
 }
 
 /*

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
@@ -190,7 +190,7 @@ xfs_buf_get_maps(
 	}
 
 	bp->b_maps = kzalloc(map_count * sizeof(struct xfs_buf_map),
-				GFP_NOFS | __GFP_NOFAIL);
+			GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
 	if (!bp->b_maps)
 		return -ENOMEM;
 	return 0;
@@ -222,7 +222,8 @@ _xfs_buf_alloc(
 	int			i;
 
 	*bpp = NULL;
-	bp = kmem_cache_zalloc(xfs_buf_cache, GFP_NOFS | __GFP_NOFAIL);
+	bp = kmem_cache_zalloc(xfs_buf_cache,
+			GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
 
 	/*
 	 * We don't want certain flags to appear in b_flags unless they are
@@ -325,7 +326,7 @@ xfs_buf_alloc_kmem(
 	struct xfs_buf	*bp,
 	xfs_buf_flags_t	flags)
 {
-	gfp_t		gfp_mask = GFP_NOFS | __GFP_NOFAIL;
+	gfp_t		gfp_mask = GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL;
 	size_t		size = BBTOB(bp->b_length);
 
 	/* Assure zeroed buffer for non-read cases. */
@@ -356,13 +357,11 @@ xfs_buf_alloc_pages(
 	struct xfs_buf	*bp,
 	xfs_buf_flags_t	flags)
 {
-	gfp_t		gfp_mask = __GFP_NOWARN;
+	gfp_t		gfp_mask = GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOWARN;
 	long		filled = 0;
 
 	if (flags & XBF_READ_AHEAD)
 		gfp_mask |= __GFP_NORETRY;
-	else
-		gfp_mask |= GFP_NOFS;
 
 	/* Make sure that we have a page list */
 	bp->b_page_count = DIV_ROUND_UP(BBTOB(bp->b_length), PAGE_SIZE);
@@ -429,11 +428,18 @@ _xfs_buf_map_pages(
 
 		/*
 		 * vm_map_ram() will allocate auxiliary structures (e.g.
-		 * pagetables) with GFP_KERNEL, yet we are likely to be under
-		 * GFP_NOFS context here. Hence we need to tell memory reclaim
-		 * that we are in such a context via PF_MEMALLOC_NOFS to prevent
-		 * memory reclaim re-entering the filesystem here and
-		 * potentially deadlocking.
+		 * pagetables) with GFP_KERNEL, yet we often under a scoped nofs
+		 * context here. Mixing GFP_KERNEL with GFP_NOFS allocations
+		 * from the same call site that can be run from both above and
+		 * below memory reclaim causes lockdep false positives. Hence we
+		 * always need to force this allocation to nofs context because
+		 * we can't pass __GFP_NOLOCKDEP down to auxillary structures to
+		 * prevent false positive lockdep reports.
+		 *
+		 * XXX(dgc): I think dquot reclaim is the only place we can get
+		 * to this function from memory reclaim context now. If we fix
+		 * that like we've fixed inode reclaim to avoid writeback from
+		 * reclaim, this nofs wrapping can go away.
 		 */
 		nofs_flag = memalloc_nofs_save();
 		do {

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
@@ -3518,7 +3518,8 @@ xlog_ticket_alloc(
 	struct xlog_ticket	*tic;
 	int			unit_res;
 
-	tic = kmem_cache_zalloc(xfs_log_ticket_cache, GFP_NOFS | __GFP_NOFAIL);
+	tic = kmem_cache_zalloc(xfs_log_ticket_cache,
+			GFP_KERNEL | __GFP_NOFAIL);
 
 	unit_res = xlog_calc_unit_res(log, unit_bytes, &tic->t_iclog_hdrs);
 

diff --git a/fs/xfs/xfs_mru_cache.c b/fs/xfs/xfs_mru_cache.c
@@ -428,7 +428,7 @@ xfs_mru_cache_insert(
 	if (!mru || !mru->lists)
 		return -EINVAL;
 
-	if (radix_tree_preload(GFP_NOFS))
+	if (radix_tree_preload(GFP_KERNEL))
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&elem->list_node);