The patch titled
Subject: fs: introduce alloc_inode_sb() to allocate filesystems specific inode
has been added to the -mm tree. Its filename is
fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: fs: introduce alloc_inode_sb() to allocate filesystems specific inode
The allocated inode cache is supposed to be added to its memcg list_lru
which should be allocated as well in advance. That can be done by
kmem_cache_alloc_lru() which allocates object and list_lru. The file
systems is main user of it. So introduce alloc_inode_sb() to allocate
file system specific inodes and set up the inode reclaim context properly.
The file system is supposed to use alloc_inode_sb() to allocate inodes.
In the later patches, we will convert all users to the new API.
Link: https://lkml.kernel.org/r/20220228122126.37293-4-songmuchun@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Alex Shi <alexs@xxxxxxxxxx>
Cc: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Fam Zheng <fam.zheng@xxxxxxxxxxxxx>
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kari Argillander <kari.argillander@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/porting.rst | 6 ++++++
fs/inode.c | 2 +-
include/linux/fs.h | 11 +++++++++++
3 files changed, 18 insertions(+), 1 deletion(-)
--- a/Documentation/filesystems/porting.rst~fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode
+++ a/Documentation/filesystems/porting.rst
@@ -45,6 +45,12 @@ typically between calling iget_locked()
At some point that will become mandatory.
+**mandatory**
+
+The foo_inode_info should always be allocated through alloc_inode_sb() rather
+than kmem_cache_alloc() or kmalloc() related to set up the inode reclaim context
+correctly.
+
---
**mandatory**
--- a/fs/inode.c~fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode
+++ a/fs/inode.c
@@ -259,7 +259,7 @@ static struct inode *alloc_inode(struct
if (ops->alloc_inode)
inode = ops->alloc_inode(sb);
else
- inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL);
+ inode = alloc_inode_sb(sb, inode_cachep, GFP_KERNEL);
if (!inode)
return NULL;
--- a/include/linux/fs.h~fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode
+++ a/include/linux/fs.h
@@ -42,6 +42,7 @@
#include <linux/mount.h>
#include <linux/cred.h>
#include <linux/mnt_idmapping.h>
+#include <linux/slab.h>
#include <asm/byteorder.h>
#include <uapi/linux/fs.h>
@@ -3114,6 +3115,16 @@ extern void free_inode_nonrcu(struct ino
extern int should_remove_suid(struct dentry *);
extern int file_remove_privs(struct file *);
+/*
+ * This must be used for allocating filesystems specific inodes to set
+ * up the inode reclaim context correctly.
+ */
+static inline void *
+alloc_inode_sb(struct super_block *sb, struct kmem_cache *cache, gfp_t gfp)
+{
+ return kmem_cache_alloc_lru(cache, &sb->s_inode_lru, gfp);
+}
+
extern void __insert_inode_hash(struct inode *, unsigned long hashval);
static inline void insert_inode_hash(struct inode *inode)
{
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-list_lru-transpose-the-array-of-per-node-per-memcg-lru-lists.patch
mm-introduce-kmem_cache_alloc_lru.patch
fs-introduce-alloc_inode_sb-to-allocate-filesystems-specific-inode.patch
fs-allocate-inode-by-using-alloc_inode_sb.patch
f2fs-allocate-inode-by-using-alloc_inode_sb.patch
nfs42-use-a-specific-kmem_cache-to-allocate-nfs4_xattr_entry.patch
mm-dcache-use-kmem_cache_alloc_lru-to-allocate-dentry.patch
xarray-use-kmem_cache_alloc_lru-to-allocate-xa_node.patch
mm-memcontrol-move-memcg_online_kmem-to-mem_cgroup_css_online.patch
mm-list_lru-allocate-list_lru_one-only-when-needed.patch
mm-list_lru-rename-memcg_drain_all_list_lrus-to-memcg_reparent_list_lrus.patch
mm-list_lru-replace-linear-array-with-xarray.patch
mm-memcontrol-reuse-memory-cgroup-id-for-kmem-id.patch
mm-memcontrol-fix-cannot-alloc-the-maximum-memcg-id.patch
mm-list_lru-rename-list_lru_per_memcg-to-list_lru_memcg.patch
mm-memcontrol-rename-memcg_cache_id-to-memcg_kmem_id.patch
mm-thp-fix-wrong-cache-flush-in-remove_migration_pmd.patch
mm-fix-missing-cache-flush-for-all-tail-pages-of-compound-page.patch
mm-hugetlb-fix-missing-cache-flush-in-copy_huge_page_from_user.patch
mm-hugetlb-fix-missing-cache-flush-in-hugetlb_mcopy_atomic_pte.patch
mm-shmem-fix-missing-cache-flush-in-shmem_mfill_atomic_pte.patch
mm-userfaultfd-fix-missing-cache-flush-in-mcopy_atomic_pte-and-__mcopy_atomic.patch
mm-replace-multiple-dcache-flush-with-flush_dcache_folio.patch
mm-hugetlb-free-the-2nd-vmemmap-page-associated-with-each-hugetlb-page.patch
mm-hugetlb-replace-hugetlb_free_vmemmap_enabled-with-a-static_key.patch
mm-sparsemem-use-page-table-lock-to-protect-kernel-pmd-operations.patch
selftests-vm-add-a-hugetlb-test-case.patch
mm-sparsemem-move-vmemmap-related-to-hugetlb-to-config_hugetlb_page_free_vmemmap.patch
