From nobody Sat Feb 7 19:08:26 2026 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 A5B24BE4F for ; Sat, 8 Mar 2025 09:47:16 +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=1741427237; cv=none; b=sChfU/uIp263GedZyIL/1FCJmR8uzkUom2i4pkWru1sL0p8oOh1nqcsATjEhljQT+Wr5zhMmInoFzu0Hs/bsBoyWysaOvdn0cqjaqAVs66jntmUB5bM2VdU2U6o+v7UYAlfxeY6GgyJ3cTYUCKouOUk+Qv4bd/uXO2I2F9/GohE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741427237; c=relaxed/simple; bh=kBJ5fzJuS4XS6xPkBmPOVlmWnL2oKehn+/7J73khbt8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=FnX5rnhPLuF/cmDcfByAcRrlakt9FgE27mya7XSYlDuJJhg+BVJ7fGd26nOcgdulYhfl4TDTPBSbCLubI/ZeD+T9oJjwYQKIZnqA2s2M+8Fye/lBMPw1mJAZPoW9NjdodgLKI0KpTca+6m7XUOvSMELafRcNDzUczHqK8tWogCs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cNiaNpnE; 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="cNiaNpnE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4708C4CEE0; Sat, 8 Mar 2025 09:47:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741427236; bh=kBJ5fzJuS4XS6xPkBmPOVlmWnL2oKehn+/7J73khbt8=; h=From:To:Cc:Subject:Date:From; b=cNiaNpnEMytoWcZRiVn759snA9q4Vv811bus0J+0flM/TQzHm4yG9XN2YpJoDWs9i Mc5kdV+Lc8FAGCnkflRYTrQejjclh9FVHiEguI51FMGHEBCmQOa4XD/qeVgu6cA/Lw s/lGDBluIWE//2aJhP6jNE35ayiZfmYad8XZSI7vvoE968VSBbkGb8tVRiuuBxvaP9 j2Q+pIlPQYzt3+qHbNKm6oF9GlHI/4sQVAjqzI9B0sfQBww3pRIiiLc7va5IuvvO/p EVwTWQHlRQd3LrA22x+1zZimB43kErVsO8K2lYdgWtVTaTqHgCV17cDKqLmMTQZ0Uq aaZQ44y6dWD5w== From: Chao Yu To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu Subject: [PATCH] f2fs: control nat_bits feature via mount option Date: Sat, 8 Mar 2025 13:18:46 +0800 Message-Id: <20250308051846.29079-1-chao@kernel.org> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce a new mount option "nat_bits" to control nat_bits feature, by default nat_bits feature is disabled. Signed-off-by: Chao Yu --- Documentation/filesystems/f2fs.rst | 2 ++ fs/f2fs/f2fs.h | 1 + fs/f2fs/node.c | 3 +++ fs/f2fs/super.c | 15 +++++++++++++++ 4 files changed, 21 insertions(+) diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems= /f2fs.rst index 42f28dbf2410..e15c4275862a 100644 --- a/Documentation/filesystems/f2fs.rst +++ b/Documentation/filesystems/f2fs.rst @@ -366,6 +366,8 @@ errors=3D%s Specify f2fs behavior on critical errors.= This supports modes: pending node write drop keep N/A pending meta write keep keep N/A =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D +nat_bits Enable nat_bits feature to enhance full/empty nat blocks access, + by default it's disabled. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 Debugfs Entries diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 8d8917b92b5d..99ded6512d8b 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -115,6 +115,7 @@ extern const char *f2fs_fault_name[FAULT_MAX]; #define F2FS_MOUNT_GC_MERGE 0x02000000 #define F2FS_MOUNT_COMPRESS_CACHE 0x04000000 #define F2FS_MOUNT_AGE_EXTENT_CACHE 0x08000000 +#define F2FS_MOUNT_NAT_BITS 0x10000000 =20 #define F2FS_OPTION(sbi) ((sbi)->mount_opt) #define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &=3D ~F2FS_MOUNT_##op= tion) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 24085fa8493b..579955c6e03c 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -3278,6 +3278,9 @@ static int init_node_manager(struct f2fs_sb_info *sbi) if (!nm_i->nat_bitmap) return -ENOMEM; =20 + if (!test_opt(sbi, NAT_BITS)) + disable_nat_bits(sbi, true); + err =3D __get_nat_bitmaps(sbi); if (err) return err; diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 079c5d4b60b6..1b8ca7d63afe 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -191,6 +191,7 @@ enum { Opt_memory_mode, Opt_age_extent_cache, Opt_errors, + Opt_nat_bits, Opt_err, }; =20 @@ -270,6 +271,7 @@ static match_table_t f2fs_tokens =3D { {Opt_memory_mode, "memory=3D%s"}, {Opt_age_extent_cache, "age_extent_cache"}, {Opt_errors, "errors=3D%s"}, + {Opt_nat_bits, "nat_bits"}, {Opt_err, NULL}, }; =20 @@ -1323,6 +1325,9 @@ static int parse_options(struct super_block *sb, char= *options, bool is_remount) } kfree(name); break; + case Opt_nat_bits: + set_opt(sbi, NAT_BITS); + break; default: f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value", p); @@ -2135,6 +2140,9 @@ static int f2fs_show_options(struct seq_file *seq, st= ruct dentry *root) else if (F2FS_OPTION(sbi).errors =3D=3D MOUNT_ERRORS_PANIC) seq_printf(seq, ",errors=3D%s", "panic"); =20 + if (test_opt(sbi, NAT_BITS)) + seq_puts(seq, ",nat_bits"); + return 0; } =20 @@ -2325,6 +2333,7 @@ static int f2fs_remount(struct super_block *sb, int *= flags, char *data) bool no_discard =3D !test_opt(sbi, DISCARD); bool no_compress_cache =3D !test_opt(sbi, COMPRESS_CACHE); bool block_unit_discard =3D f2fs_block_unit_discard(sbi); + bool no_nat_bits =3D !test_opt(sbi, NAT_BITS); #ifdef CONFIG_QUOTA int i, j; #endif @@ -2453,6 +2462,12 @@ static int f2fs_remount(struct super_block *sb, int = *flags, char *data) goto restore_opts; } =20 + if (no_nat_bits =3D=3D !!test_opt(sbi, NAT_BITS)) { + err =3D -EINVAL; + f2fs_warn(sbi, "switch nat_bits option is not allowed"); + goto restore_opts; + } + if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) { err =3D -EINVAL; f2fs_warn(sbi, "disabling checkpoint not compatible with read-only"); --=20 2.40.1