[PATCH 4/5] xfs: Remove kmem_realloc

From: Carlos Maiolino <cmaiolino@redhat.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH 4/5] xfs: Remove kmem_realloc
Date: Wed, 20 Nov 2019 11:44:24 +0100	[thread overview]
Message-ID: <20191120104425.407213-5-cmaiolino@redhat.com> (raw)
In-Reply-To: <20191120104425.407213-1-cmaiolino@redhat.com>

We can use krealloc() with __GFP_NOFAIL directly

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
---
V2:
	- Fix small conflict in kmem.h due removal of kmem_free()
	- Small comment update on xfs_iroot_realloc()

 fs/xfs/kmem.c                  | 22 ----------------------
 fs/xfs/kmem.h                  |  1 -
 fs/xfs/libxfs/xfs_iext_tree.c  |  2 +-
 fs/xfs/libxfs/xfs_inode_fork.c | 10 +++++-----
 fs/xfs/xfs_log_recover.c       |  2 +-
 fs/xfs/xfs_mount.c             |  4 ++--
 6 files changed, 9 insertions(+), 32 deletions(-)

diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index 2644fdaa0549..6e10e565632c 100644
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -93,25 +93,3 @@ kmem_alloc_large(size_t size, xfs_km_flags_t flags)
 		return ptr;
 	return __kmem_vmalloc(size, flags);
 }
-
-void *
-kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags)
-{
-	int	retries = 0;
-	gfp_t	lflags = kmem_flags_convert(flags);
-	void	*ptr;
-
-	trace_kmem_realloc(newsize, flags, _RET_IP_);
-
-	do {
-		ptr = krealloc(old, newsize, lflags);
-		if (ptr || (flags & KM_MAYFAIL))
-			return ptr;
-		if (!(++retries % 100))
-			xfs_err(NULL,
-	"%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)",
-				current->comm, current->pid,
-				newsize, __func__, lflags);
-		congestion_wait(BLK_RW_ASYNC, HZ/50);
-	} while (1);
-}
diff --git a/fs/xfs/kmem.h b/fs/xfs/kmem.h
index b9ee67fa747b..a18c27c99721 100644
--- a/fs/xfs/kmem.h
+++ b/fs/xfs/kmem.h
@@ -55,7 +55,6 @@ kmem_flags_convert(xfs_km_flags_t flags)
 extern void *kmem_alloc(size_t, xfs_km_flags_t);
 extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
 extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
-extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
 
 static inline void *
 kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
diff --git a/fs/xfs/libxfs/xfs_iext_tree.c b/fs/xfs/libxfs/xfs_iext_tree.c
index e75e7c021187..78c9f6c7a36a 100644
--- a/fs/xfs/libxfs/xfs_iext_tree.c
+++ b/fs/xfs/libxfs/xfs_iext_tree.c
@@ -607,7 +607,7 @@ xfs_iext_realloc_root(
 	if (new_size / sizeof(struct xfs_iext_rec) == RECS_PER_LEAF)
 		new_size = NODE_SIZE;
 
-	new = kmem_realloc(ifp->if_u1.if_root, new_size, KM_NOFS);
+	new = krealloc(ifp->if_u1.if_root, new_size, GFP_NOFS | __GFP_NOFAIL);
 	memset(new + ifp->if_bytes, 0, new_size - ifp->if_bytes);
 	ifp->if_u1.if_root = new;
 	cur->leaf = new;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index ceb322c7105e..82799dddf97d 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -380,15 +380,15 @@ xfs_iroot_realloc(
 
 		/*
 		 * If there is already an existing if_broot, then we need
-		 * to realloc() it and shift the pointers to their new
+		 * to krealloc() it and shift the pointers to their new
 		 * location.  The records don't change location because
 		 * they are kept butted up against the btree block header.
 		 */
 		cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
 		new_max = cur_max + rec_diff;
 		new_size = XFS_BMAP_BROOT_SPACE_CALC(mp, new_max);
-		ifp->if_broot = kmem_realloc(ifp->if_broot, new_size,
-				KM_NOFS);
+		ifp->if_broot = krealloc(ifp->if_broot, new_size,
+				GFP_NOFS | __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,
@@ -497,8 +497,8 @@ xfs_idata_realloc(
 	 * in size so that it can be logged and stay on word boundaries.
 	 * We enforce that here.
 	 */
-	ifp->if_u1.if_data = kmem_realloc(ifp->if_u1.if_data,
-			roundup(new_size, 4), KM_NOFS);
+	ifp->if_u1.if_data = krealloc(ifp->if_u1.if_data, roundup(new_size, 4),
+				      GFP_NOFS | __GFP_NOFAIL);
 	ifp->if_bytes = new_size;
 }
 
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index cb02deb5dedc..5423171e0b7d 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -4211,7 +4211,7 @@ xlog_recover_add_to_cont_trans(
 	old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
 	old_len = item->ri_buf[item->ri_cnt-1].i_len;
 
-	ptr = kmem_realloc(old_ptr, len + old_len, 0);
+	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
 	memcpy(&ptr[old_len], dp, len);
 	item->ri_buf[item->ri_cnt-1].i_len += len;
 	item->ri_buf[item->ri_cnt-1].i_addr = ptr;
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index c352567c8ef5..12a1cdf8e292 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -80,9 +80,9 @@ xfs_uuid_mount(
 	}
 
 	if (hole < 0) {
-		xfs_uuid_table = kmem_realloc(xfs_uuid_table,
+		xfs_uuid_table = krealloc(xfs_uuid_table,
 			(xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
-			0);
+			GFP_KERNEL | __GFP_NOFAIL);
 		hole = xfs_uuid_table_size++;
 	}
 	xfs_uuid_table[hole] = *uuid;
-- 
2.23.0

