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([49.205.218.89]) by smtp.gmail.com with ESMTPSA id x11-20020aa784cb000000b006e45c5d7720sm4138206pfn.93.2024.03.01.23.42.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Mar 2024 23:42:39 -0800 (PST) From: "Ritesh Harjani (IBM)" To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org Cc: Ojaswin Mujoo , Jan Kara , Theodore Ts'o , Matthew Wilcox , "Darrick J . Wong" , Luis Chamberlain , John Garry , linux-kernel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [RFC 4/8] ext4: Add statx and other atomic write helper routines Date: Sat, 2 Mar 2024 13:12:01 +0530 Message-ID: <9def15d6ffb88f7352713c65292513fab532112a.1709361537.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <555cc3e262efa77ee5648196362f415a1efc018d.1709361537.git.ritesh.list@gmail.com> References: <555cc3e262efa77ee5648196362f415a1efc018d.1709361537.git.ritesh.list@gmail.com> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This patch adds the statx (STATX_WRITE_ATOMIC) support in ext4_getattr() to query for atomic_write_unit_min(awu_min), awu_max and other attributes for atomic writes. This adds a new runtime mount flag (EXT4_MF_ATOMIC_WRITE_FSAWU), for querying whether ext4 supports atomic write using fsawu (filesystem atomic write unit). Co-developed-by: Ojaswin Mujoo Signed-off-by: Ojaswin Mujoo Signed-off-by: Ritesh Harjani (IBM) --- fs/ext4/ext4.h | 53 ++++++++++++++++++++++++++++++++++++++++++++++++- fs/ext4/inode.c | 16 +++++++++++++++ 2 files changed, 68 insertions(+), 1 deletion(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 023571f8dd1b..1d2bce26e616 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1817,7 +1817,8 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) */ enum { EXT4_MF_MNTDIR_SAMPLED, - EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ + EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ + EXT4_MF_ATOMIC_WRITE_FSAWU /* Atomic write via FSAWU */ }; static inline void ext4_set_mount_flag(struct super_block *sb, int bit) @@ -3839,6 +3840,56 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh) return buffer_uptodate(bh); } +#define ext4_can_atomic_write_fsawu(sb) \ + ext4_test_mount_flag(sb, EXT4_MF_ATOMIC_WRITE_FSAWU) + +/** + * ext4_atomic_write_fsawu Returns EXT4 filesystem atomic write unit. + * @sb super_block + * This returns the filesystem min|max atomic write units. + * For !bigalloc it is filesystem blocksize (fsawu_min) + * For bigalloc it should be either blocksize or multiple of blocksize + * (fsawu_min) + */ +static inline void ext4_atomic_write_fsawu(struct super_block *sb, + unsigned int *fsawu_min, + unsigned int *fsawu_max) +{ + u8 blkbits = sb->s_blocksize_bits; + unsigned int blocksize = 1U << blkbits; + unsigned int clustersize = blocksize; + struct block_device *bdev = sb->s_bdev; + unsigned int awu_min = + queue_atomic_write_unit_min_bytes(bdev->bd_queue); + unsigned int awu_max = + queue_atomic_write_unit_max_bytes(bdev->bd_queue); + + if (ext4_has_feature_bigalloc(sb)) + clustersize = 1U << (EXT4_SB(sb)->s_cluster_bits + blkbits); + + /* fs min|max should respect awu_[min|max] units */ + if (unlikely(awu_min > clustersize || awu_max < blocksize)) + goto not_supported; + + /* in case of !bigalloc fsawu_[min|max] should be same as blocksize */ + if (!ext4_has_feature_bigalloc(sb)) { + *fsawu_min = blocksize; + *fsawu_max = blocksize; + return; + } + + /* bigalloc can support write in blocksize units. So advertize it */ + *fsawu_min = max(blocksize, awu_min); + *fsawu_max = min(clustersize, awu_max); + + /* This should never happen, but let's keep a WARN_ON_ONCE */ + WARN_ON_ONCE(!IS_ALIGNED(clustersize, *fsawu_min)); + return; +not_supported: + *fsawu_min = 0; + *fsawu_max = 0; +} + #endif /* __KERNEL__ */ #define EFSBADCRC EBADMSG /* Bad CRC detected */ diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2ccf3b5e3a7c..ea009ca9085d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5536,6 +5536,22 @@ int ext4_getattr(struct mnt_idmap *idmap, const struct path *path, } } + if (request_mask & STATX_WRITE_ATOMIC) { + unsigned int fsawu_min = 0, fsawu_max = 0; + + /* + * Get fsawu_[min|max] value which we can advertise to userspace + * in statx call, if we support atomic writes using + * EXT4_MF_ATOMIC_WRITE_FSAWU. + */ + if (ext4_can_atomic_write_fsawu(inode->i_sb)) { + ext4_atomic_write_fsawu(inode->i_sb, &fsawu_min, + &fsawu_max); + } + + generic_fill_statx_atomic_writes(stat, fsawu_min, fsawu_max); + } + flags = ei->i_flags & EXT4_FL_USER_VISIBLE; if (flags & EXT4_APPEND_FL) stat->attributes |= STATX_ATTR_APPEND;