From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B677C2F1FD5 for ; Tue, 30 Dec 2025 19:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767124519; cv=none; b=TjqjiuDSQNgs5MqME9jUc8Xs8R/PIEpPDa/F54HdTC0cvvi5os6faqHozop59ElriFLfiIe82I3idGP/R5Nykn9zmwPuPvu/Td48YAc1YiqjQgCLcp/IFS5ZyV+vUSQrimkA+QKb0PEPC/NHGPE36K08AI7uzGXkm6BaqTaJ1VQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767124519; c=relaxed/simple; bh=nejhAwr8q8eMBtRldFxk6r/L8Lu00LwTRf6bAfWVwiA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kWshbKfKu+sa/Bp+OavV0ImyzIYgxyrkHg2hvmVnsa/zQXQW4fBac49mJ5idIbrXM9gEVtb4qc+v0dE0EZ79pU7wsT83IjSjULv2FtwiA5GXqcGomNszR/mePE823aoEiezQfdQR/bpRIEFDxWBEeDPFW/SPoq1JJiqIAfLWASE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oKBm6R1o; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oKBm6R1o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94B17C4CEFB; Tue, 30 Dec 2025 19:55:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767124519; bh=nejhAwr8q8eMBtRldFxk6r/L8Lu00LwTRf6bAfWVwiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oKBm6R1oSClbiTAmjDlRaaWlOUIU8hy8PTAZ/ywbdiiwxbpwL8FysEKonaCm3Ouzk C59rUpp8NJNI0sTF4k15tDFQX/tELPK4HmutLa8Y9+Gwb//KAhhfstTf0kpIhfkk6n 7uT0LEs+KpKfiMKTvXsKDYc631lkz2aAtv13fU6xJfkyYL2nl2WShDe8C1BCe48llG EE/gPvky5R5/7WxOnOvRatu1JWGhRkYCuBGJblsxmmBg4lUl5G8Omb/AgFxUlu4lGR YWr0MVP3Gvrq6lC5kouMjh534KRycndXBEFoWRn2udV/FI3FsG9ifVb1Rxd0TsBYEd 5tk2Z76XXKqoQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Chao Yu , stable@kernel.org, Hong Yun , Jaegeuk Kim , Sasha Levin Subject: [PATCH 5.15.y] f2fs: use global inline_xattr_slab instead of per-sb slab cache Date: Tue, 30 Dec 2025 14:55:17 -0500 Message-ID: <20251230195517.2448220-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2025122923-untie-obscure-aaff@gregkh> References: <2025122923-untie-obscure-aaff@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Chao Yu [ Upstream commit 1f27ef42bb0b7c0740c5616ec577ec188b8a1d05 ] As Hong Yun reported in mailing list: loop7: detected capacity change from 0 to 131072 ------------[ cut here ]------------ kmem_cache of name 'f2fs_xattr_entry-7:7' already exists WARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 kmem_cache_sanity_check mm/slab_common.c:109 [inline] WARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 __kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307 CPU: 0 UID: 0 PID: 24426 Comm: syz.7.1370 Not tainted 6.17.0-rc4 #1 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:109 [inline] RIP: 0010:__kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307 Call Trace:  __kmem_cache_create include/linux/slab.h:353 [inline]  f2fs_kmem_cache_create fs/f2fs/f2fs.h:2943 [inline]  f2fs_init_xattr_caches+0xa5/0xe0 fs/f2fs/xattr.c:843  f2fs_fill_super+0x1645/0x2620 fs/f2fs/super.c:4918  get_tree_bdev_flags+0x1fb/0x260 fs/super.c:1692  vfs_get_tree+0x43/0x140 fs/super.c:1815  do_new_mount+0x201/0x550 fs/namespace.c:3808  do_mount fs/namespace.c:4136 [inline]  __do_sys_mount fs/namespace.c:4347 [inline]  __se_sys_mount+0x298/0x2f0 fs/namespace.c:4324  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]  do_syscall_64+0x8e/0x3a0 arch/x86/entry/syscall_64.c:94  entry_SYSCALL_64_after_hwframe+0x76/0x7e The bug can be reproduced w/ below scripts: - mount /dev/vdb /mnt1 - mount /dev/vdc /mnt2 - umount /mnt1 - mounnt /dev/vdb /mnt1 The reason is if we created two slab caches, named f2fs_xattr_entry-7:3 and f2fs_xattr_entry-7:7, and they have the same slab size. Actually, slab system will only create one slab cache core structure which has slab name of "f2fs_xattr_entry-7:3", and two slab caches share the same structure and cache address. So, if we destroy f2fs_xattr_entry-7:3 cache w/ cache address, it will decrease reference count of slab cache, rather than release slab cache entirely, since there is one more user has referenced the cache. Then, if we try to create slab cache w/ name "f2fs_xattr_entry-7:3" again, slab system will find that there is existed cache which has the same name and trigger the warning. Let's changes to use global inline_xattr_slab instead of per-sb slab cache for fixing. Fixes: a999150f4fe3 ("f2fs: use kmem_cache pool during inline xattr lookups") Cc: stable@kernel.org Reported-by: Hong Yun Tested-by: Hong Yun Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim [ folio => page + different module init/exit ordering ] Signed-off-by: Sasha Levin --- fs/f2fs/f2fs.h | 3 --- fs/f2fs/super.c | 15 +++++++-------- fs/f2fs/xattr.c | 32 +++++++++++--------------------- fs/f2fs/xattr.h | 10 ++++++---- 4 files changed, 24 insertions(+), 36 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 5475d017ad1e..31968257ad8e 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1763,9 +1763,6 @@ struct f2fs_sb_info { struct workqueue_struct *post_read_wq; /* post read workqueue */ - struct kmem_cache *inline_xattr_slab; /* inline xattr entry */ - unsigned int inline_xattr_slab_size; /* default inline xattr slab size */ - /* For reclaimed segs statistics per each GC mode */ unsigned int gc_segment_mode; /* GC state for reclaimed segments */ unsigned int gc_reclaimed_segs[MAX_GC_MODE]; /* Reclaimed segs for each mode */ diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index b9da3074a1af..e8488b3517c9 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1655,7 +1655,6 @@ static void f2fs_put_super(struct super_block *sb) destroy_device_list(sbi); f2fs_destroy_page_array_cache(sbi); - f2fs_destroy_xattr_caches(sbi); mempool_destroy(sbi->write_io_dummy); #ifdef CONFIG_QUOTA for (i = 0; i < MAXQUOTAS; i++) @@ -4166,13 +4165,9 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) } } - /* init per sbi slab cache */ - err = f2fs_init_xattr_caches(sbi); - if (err) - goto free_io_dummy; err = f2fs_init_page_array_cache(sbi); if (err) - goto free_xattr_cache; + goto free_io_dummy; /* get an inode for meta space */ sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); @@ -4488,8 +4483,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) sbi->meta_inode = NULL; free_page_array_cache: f2fs_destroy_page_array_cache(sbi); -free_xattr_cache: - f2fs_destroy_xattr_caches(sbi); free_io_dummy: mempool_destroy(sbi->write_io_dummy); free_percpu: @@ -4656,7 +4649,12 @@ static int __init init_f2fs_fs(void) err = f2fs_create_casefold_cache(); if (err) goto free_compress_cache; + err = f2fs_init_xattr_cache(); + if (err) + goto free_casefold_cache; return 0; +free_casefold_cache: + f2fs_destroy_casefold_cache(); free_compress_cache: f2fs_destroy_compress_cache(); free_compress_mempool: @@ -4696,6 +4694,7 @@ static int __init init_f2fs_fs(void) static void __exit exit_f2fs_fs(void) { + f2fs_destroy_xattr_cache(); f2fs_destroy_casefold_cache(); f2fs_destroy_compress_cache(); f2fs_destroy_compress_mempool(); diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index 6bc8efda406a..4f49b660f9b6 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -23,11 +23,12 @@ #include "xattr.h" #include "segment.h" +static struct kmem_cache *inline_xattr_slab; static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline) { - if (likely(size == sbi->inline_xattr_slab_size)) { + if (likely(size == DEFAULT_XATTR_SLAB_SIZE)) { *is_inline = true; - return f2fs_kmem_cache_alloc(sbi->inline_xattr_slab, + return f2fs_kmem_cache_alloc(inline_xattr_slab, GFP_F2FS_ZERO, false, sbi); } *is_inline = false; @@ -38,7 +39,7 @@ static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr, bool is_inline) { if (is_inline) - kmem_cache_free(sbi->inline_xattr_slab, xattr_addr); + kmem_cache_free(inline_xattr_slab, xattr_addr); else kfree(xattr_addr); } @@ -818,25 +819,14 @@ int f2fs_setxattr(struct inode *inode, int index, const char *name, return err; } -int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) +int __init f2fs_init_xattr_cache(void) { - dev_t dev = sbi->sb->s_bdev->bd_dev; - char slab_name[32]; - - sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev)); - - sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size * - sizeof(__le32) + XATTR_PADDING_SIZE; - - sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name, - sbi->inline_xattr_slab_size); - if (!sbi->inline_xattr_slab) - return -ENOMEM; - - return 0; + inline_xattr_slab = f2fs_kmem_cache_create("f2fs_xattr_entry", + DEFAULT_XATTR_SLAB_SIZE); + return inline_xattr_slab ? 0 : -ENOMEM; } -void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) +void f2fs_destroy_xattr_cache(void) { - kmem_cache_destroy(sbi->inline_xattr_slab); -} + kmem_cache_destroy(inline_xattr_slab); +} \ No newline at end of file diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h index 416d652774a3..c1d3b3520ea6 100644 --- a/fs/f2fs/xattr.h +++ b/fs/f2fs/xattr.h @@ -88,6 +88,8 @@ struct f2fs_xattr_entry { F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \ DEF_INLINE_RESERVED_SIZE - \ MIN_INLINE_DENTRY_SIZE / sizeof(__le32)) +#define DEFAULT_XATTR_SLAB_SIZE (DEFAULT_INLINE_XATTR_ADDRS * \ + sizeof(__le32) + XATTR_PADDING_SIZE) /* * On-disk structure of f2fs_xattr @@ -131,8 +133,8 @@ extern int f2fs_setxattr(struct inode *, int, const char *, extern int f2fs_getxattr(struct inode *, int, const char *, void *, size_t, struct page *); extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); -extern int f2fs_init_xattr_caches(struct f2fs_sb_info *); -extern void f2fs_destroy_xattr_caches(struct f2fs_sb_info *); +int __init f2fs_init_xattr_cache(void); +void f2fs_destroy_xattr_cache(void); #else #define f2fs_xattr_handlers NULL @@ -149,8 +151,8 @@ static inline int f2fs_getxattr(struct inode *inode, int index, { return -EOPNOTSUPP; } -static inline int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; } -static inline void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { } +static inline int __init f2fs_init_xattr_cache(void) { return 0; } +static inline void f2fs_destroy_xattr_cache(void) { } #endif #ifdef CONFIG_F2FS_FS_SECURITY -- 2.51.0