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charset="utf-8" Darrick and Hannes both thought it better that generic_atomic_write_valid() should be passed a struct iocb, and not just the member of that struct which is referenced; see [0] and [1]. I think that makes a more generic and clean API, so make that change. [0] https://lore.kernel.org/linux-block/680ce641-729b-4150-b875-531a9865768= 2@suse.de/ [1] https://lore.kernel.org/linux-xfs/20240620212401.GA3058325@frogsfrogsfr= ogs/ Suggested-by: "Darrick J. Wong" Suggested-by: Hannes Reinecke Reviewed-by: "Darrick J. Wong" Reviewed-by: Christoph Hellwig Signed-off-by: John Garry --- block/fops.c | 8 ++++---- fs/read_write.c | 4 ++-- include/linux/fs.h | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/block/fops.c b/block/fops.c index e696ae53bf1e..968b47b615c4 100644 --- a/block/fops.c +++ b/block/fops.c @@ -35,13 +35,13 @@ static blk_opf_t dio_bio_write_op(struct kiocb *iocb) return opf; } =20 -static bool blkdev_dio_invalid(struct block_device *bdev, loff_t pos, +static bool blkdev_dio_invalid(struct block_device *bdev, struct kiocb *io= cb, struct iov_iter *iter, bool is_atomic) { - if (is_atomic && !generic_atomic_write_valid(iter, pos)) + if (is_atomic && !generic_atomic_write_valid(iocb, iter)) return true; =20 - return pos & (bdev_logical_block_size(bdev) - 1) || + return iocb->ki_pos & (bdev_logical_block_size(bdev) - 1) || !bdev_iter_is_aligned(bdev, iter); } =20 @@ -374,7 +374,7 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, str= uct iov_iter *iter) if (!iov_iter_count(iter)) return 0; =20 - if (blkdev_dio_invalid(bdev, iocb->ki_pos, iter, is_atomic)) + if (blkdev_dio_invalid(bdev, iocb, iter, is_atomic)) return -EINVAL; =20 nr_pages =3D bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1); diff --git a/fs/read_write.c b/fs/read_write.c index 64dc24afdb3a..2c3263530828 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1830,7 +1830,7 @@ int generic_file_rw_checks(struct file *file_in, stru= ct file *file_out) return 0; } =20 -bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos) +bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter) { size_t len =3D iov_iter_count(iter); =20 @@ -1840,7 +1840,7 @@ bool generic_atomic_write_valid(struct iov_iter *iter= , loff_t pos) if (!is_power_of_2(len)) return false; =20 - if (!IS_ALIGNED(pos, len)) + if (!IS_ALIGNED(iocb->ki_pos, len)) return false; =20 return true; diff --git a/include/linux/fs.h b/include/linux/fs.h index e3c603d01337..fbfa032d1d90 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3721,6 +3721,6 @@ static inline bool vfs_empty_path(int dfd, const char= __user *path) return !c; 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charset="utf-8" The XFS code will need this. 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Wong" Reviewed-by: Christoph Hellwig Signed-off-by: John Garry --- fs/read_write.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/read_write.c b/fs/read_write.c index 2c3263530828..32b476bf9be0 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1845,3 +1845,4 @@ bool generic_atomic_write_valid(struct kiocb *iocb, s= truct iov_iter *iter) =20 return true; } +EXPORT_SYMBOL_GPL(generic_atomic_write_valid); --=20 2.31.1 From nobody Thu Nov 28 04:47:49 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 8433B146A87; Fri, 4 Oct 2024 09:23:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.165.32 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728033836; cv=fail; b=TZ0u/tiJHrS/UbujTd+4SoLH03AmVV7GWaXKBP4+EP9U9VUr2Jpk7FPIxDcD1aYdw94sOXDMWfU2Kg7YAtbz1uRc3uCJvM8Qtz8dooRglgjzTMlu3SV601+2/z22oUSRLV5yt4NFC//tY/9bedzQEbYcc9KwTZPxLUBFIrZceos= ARC-Message-Signature: i=2; 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charset="utf-8" Currently FMODE_CAN_ATOMIC_WRITE is set if the bdev can atomic write and the file is open for direct IO. This does not work if the file is not opened for direct IO, yet fcntl(O_DIRECT) is used on the fd later. Change to check for direct IO on a per-IO basis in generic_atomic_write_valid(). Since we want to report -EOPNOTSUPP for non-direct IO for an atomic write, change to return an error code. Relocate the block fops atomic write checks to the common write path, as to catch non-direct IO. Signed-off-by: John Garry Reviewed-by: Christoph Hellwig --- block/fops.c | 18 ++++++++++-------- fs/read_write.c | 13 ++++++++----- include/linux/fs.h | 2 +- 3 files changed, 19 insertions(+), 14 deletions(-) diff --git a/block/fops.c b/block/fops.c index 968b47b615c4..2d01c9007681 100644 --- a/block/fops.c +++ b/block/fops.c @@ -36,11 +36,8 @@ static blk_opf_t dio_bio_write_op(struct kiocb *iocb) } =20 static bool blkdev_dio_invalid(struct block_device *bdev, struct kiocb *io= cb, - struct iov_iter *iter, bool is_atomic) + struct iov_iter *iter) { - if (is_atomic && !generic_atomic_write_valid(iocb, iter)) - return true; - return iocb->ki_pos & (bdev_logical_block_size(bdev) - 1) || !bdev_iter_is_aligned(bdev, iter); } @@ -368,13 +365,12 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb = *iocb, static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { struct block_device *bdev =3D I_BDEV(iocb->ki_filp->f_mapping->host); - bool is_atomic =3D iocb->ki_flags & IOCB_ATOMIC; unsigned int nr_pages; =20 if (!iov_iter_count(iter)) return 0; =20 - if (blkdev_dio_invalid(bdev, iocb, iter, is_atomic)) + if (blkdev_dio_invalid(bdev, iocb, iter)) return -EINVAL; =20 nr_pages =3D bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1); @@ -383,7 +379,7 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, str= uct iov_iter *iter) return __blkdev_direct_IO_simple(iocb, iter, bdev, nr_pages); return __blkdev_direct_IO_async(iocb, iter, bdev, nr_pages); - } else if (is_atomic) { + } else if (iocb->ki_flags & IOCB_ATOMIC) { return -EINVAL; } return __blkdev_direct_IO(iocb, iter, bdev, bio_max_segs(nr_pages)); @@ -625,7 +621,7 @@ static int blkdev_open(struct inode *inode, struct file= *filp) if (!bdev) return -ENXIO; =20 - if (bdev_can_atomic_write(bdev) && filp->f_flags & O_DIRECT) + if (bdev_can_atomic_write(bdev)) filp->f_mode |=3D FMODE_CAN_ATOMIC_WRITE; =20 ret =3D bdev_open(bdev, mode, filp->private_data, NULL, filp); @@ -700,6 +696,12 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, s= truct iov_iter *from) if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) =3D=3D IOCB_NOWAIT) return -EOPNOTSUPP; =20 + if (iocb->ki_flags & IOCB_ATOMIC) { + ret =3D generic_atomic_write_valid(iocb, from); + if (ret) + return ret; + } + size -=3D iocb->ki_pos; if (iov_iter_count(from) > size) { shorted =3D iov_iter_count(from) - size; diff --git a/fs/read_write.c b/fs/read_write.c index 32b476bf9be0..3e5dad12a5b4 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1830,19 +1830,22 @@ int generic_file_rw_checks(struct file *file_in, st= ruct file *file_out) return 0; } =20 -bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter) +int generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter) { size_t len =3D iov_iter_count(iter); =20 if (!iter_is_ubuf(iter)) - return false; + return -EINVAL; =20 if (!is_power_of_2(len)) - return false; + return -EINVAL; =20 if (!IS_ALIGNED(iocb->ki_pos, len)) - return false; + return -EINVAL; =20 - return true; + if (!(iocb->ki_flags & IOCB_DIRECT)) + return -EOPNOTSUPP; + + return 0; } EXPORT_SYMBOL_GPL(generic_atomic_write_valid); 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charset="utf-8" Support direct I/O atomic writes by producing a single bio with REQ_ATOMIC flag set. Initially FSes (XFS) should only support writing a single FS block atomically. As with any atomic write, we should produce a single bio which covers the complete write length. Signed-off-by: John Garry --- .../filesystems/iomap/operations.rst | 11 ++++++ fs/iomap/direct-io.c | 38 +++++++++++++++++-- fs/iomap/trace.h | 3 +- include/linux/iomap.h | 1 + 4 files changed, 48 insertions(+), 5 deletions(-) diff --git a/Documentation/filesystems/iomap/operations.rst b/Documentation= /filesystems/iomap/operations.rst index 8e6c721d2330..fb95e99ca1a0 100644 --- a/Documentation/filesystems/iomap/operations.rst +++ b/Documentation/filesystems/iomap/operations.rst @@ -513,6 +513,17 @@ IOMAP_WRITE`` with any combination of the following en= hancements: if the mapping is unwritten and the filesystem cannot handle zeroing the unaligned regions without exposing stale contents. =20 + * ``IOMAP_ATOMIC``: This write is being issued with torn-write + protection. Only a single bio can be created for the write, and the + write must not be split into multiple I/O requests, i.e. flag + REQ_ATOMIC must be set. + The file range to write must be aligned to satisfy the requirements + of both the filesystem and the underlying block device's atomic + commit capabilities. + If filesystem metadata updates are required (e.g. unwritten extent + conversion or copy on write), all updates for the entire file range + must be committed atomically as well. + Callers commonly hold ``i_rwsem`` in shared or exclusive mode before calling this function. =20 diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index f637aa0706a3..c968a0e2a60b 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -271,7 +271,7 @@ static int iomap_dio_zero(const struct iomap_iter *iter= , struct iomap_dio *dio, * clearing the WRITE_THROUGH flag in the dio request. */ static inline blk_opf_t iomap_dio_bio_opflags(struct iomap_dio *dio, - const struct iomap *iomap, bool use_fua) + const struct iomap *iomap, bool use_fua, bool atomic) { blk_opf_t opflags =3D REQ_SYNC | REQ_IDLE; =20 @@ -283,6 +283,8 @@ static inline blk_opf_t iomap_dio_bio_opflags(struct io= map_dio *dio, opflags |=3D REQ_FUA; else dio->flags &=3D ~IOMAP_DIO_WRITE_THROUGH; + if (atomic) + opflags |=3D REQ_ATOMIC; =20 return opflags; } @@ -293,7 +295,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_ite= r *iter, const struct iomap *iomap =3D &iter->iomap; struct inode *inode =3D iter->inode; unsigned int fs_block_size =3D i_blocksize(inode), pad; - loff_t length =3D iomap_length(iter); + const loff_t length =3D iomap_length(iter); + bool atomic =3D iter->flags & IOMAP_ATOMIC; loff_t pos =3D iter->pos; blk_opf_t bio_opf; struct bio *bio; @@ -303,6 +306,9 @@ static loff_t iomap_dio_bio_iter(const struct iomap_ite= r *iter, size_t copied =3D 0; size_t orig_count; =20 + if (atomic && (length !=3D fs_block_size)) + return -EINVAL; + if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1) || !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter)) return -EINVAL; @@ -382,7 +388,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_ite= r *iter, * can set up the page vector appropriately for a ZONE_APPEND * operation. */ - bio_opf =3D iomap_dio_bio_opflags(dio, iomap, use_fua); + bio_opf =3D iomap_dio_bio_opflags(dio, iomap, use_fua, atomic); =20 nr_pages =3D bio_iov_vecs_to_alloc(dio->submit.iter, BIO_MAX_VECS); do { @@ -415,6 +421,17 @@ static loff_t iomap_dio_bio_iter(const struct iomap_it= er *iter, } =20 n =3D bio->bi_iter.bi_size; + if (atomic && n !=3D length) { + /* + * This bio should have covered the complete length, + * which it doesn't, so error. We may need to zero out + * the tail (complete FS block), similar to when + * bio_iov_iter_get_pages() returns an error, above. + */ + ret =3D -EINVAL; + bio_put(bio); + goto zero_tail; + } if (dio->flags & IOMAP_DIO_WRITE) { task_io_account_write(n); } else { @@ -598,6 +615,9 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *ite= r, if (iocb->ki_flags & IOCB_NOWAIT) iomi.flags |=3D IOMAP_NOWAIT; =20 + if (iocb->ki_flags & IOCB_ATOMIC) + iomi.flags |=3D IOMAP_ATOMIC; + if (iov_iter_rw(iter) =3D=3D READ) { /* reads can always complete inline */ dio->flags |=3D IOMAP_DIO_INLINE_COMP; @@ -659,7 +679,17 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *it= er, if (ret !=3D -EAGAIN) { trace_iomap_dio_invalidate_fail(inode, iomi.pos, iomi.len); - ret =3D -ENOTBLK; + if (iocb->ki_flags & IOCB_ATOMIC) { + /* + * folio invalidation failed, maybe + * this is transient, unlock and see if + * the caller tries again. + */ + ret =3D -EAGAIN; + } else { + /* fall back to buffered write */ + ret =3D -ENOTBLK; + } } goto out_free_dio; } diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h index 0a991c4ce87d..4118a42cdab0 100644 --- a/fs/iomap/trace.h +++ b/fs/iomap/trace.h @@ -98,7 +98,8 @@ DEFINE_RANGE_EVENT(iomap_dio_rw_queued); { IOMAP_REPORT, "REPORT" }, \ { IOMAP_FAULT, "FAULT" }, \ { IOMAP_DIRECT, "DIRECT" }, \ - { IOMAP_NOWAIT, "NOWAIT" } + { IOMAP_NOWAIT, "NOWAIT" }, \ + { IOMAP_ATOMIC, "ATOMIC" } =20 #define IOMAP_F_FLAGS_STRINGS \ { IOMAP_F_NEW, "NEW" }, \ diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 4ad12a3c8bae..c7644bdcfca3 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -178,6 +178,7 @@ struct iomap_folio_ops { #else #define IOMAP_DAX 0 #endif /* CONFIG_FS_DAX */ +#define IOMAP_ATOMIC (1 << 9) =20 struct iomap_ops { /* --=20 2.31.1 From nobody Thu Nov 28 04:47:49 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 19EFF147C86; 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Fri, 4 Oct 2024 09:23:26 +0000 From: John Garry To: axboe@kernel.dk, brauner@kernel.org, djwong@kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, dchinner@redhat.com, hch@lst.de, cem@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, hare@suse.de, martin.petersen@oracle.com, catherine.hoang@oracle.com, mcgrof@kernel.org, ritesh.list@gmail.com, ojaswin@linux.ibm.com, John Garry Subject: [PATCH v7 5/8] xfs: Support FS_XFLAG_ATOMICWRITES Date: Fri, 4 Oct 2024 09:22:51 +0000 Message-Id: <20241004092254.3759210-6-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241004092254.3759210-1-john.g.garry@oracle.com> References: <20241004092254.3759210-1-john.g.garry@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0028.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:151::15) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|IA1PR10MB6900:EE_ X-MS-Office365-Filtering-Correlation-Id: 943eedb2-4439-4a28-5604-08dce4563344 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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charset="utf-8" Add initial support for new flag FS_XFLAG_ATOMICWRITES. This flag is a file attribute that mirrors an ondisk inode flag. Actual support for untorn file writes (for now) depends on both the iflag and the underlying storage devices, which we can only really check at statx and pwritev2() time. This is the same story as FS_XFLAG_DAX, which signals to the fs that we should try to enable the fsdax IO path on the file (instead of the regular page cache), but applications have to query STAT_ATTR_DAX to find out if they really got that IO path. Current kernel support for atomic writes is based on HW support (for atomic writes). Since for regular files XFS has no way to specify extent alignment or granularity, atomic write size is limited to the FS block size. Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_format.h | 11 +++++++++-- fs/xfs/libxfs/xfs_inode_buf.c | 22 ++++++++++++++++++++++ fs/xfs/libxfs/xfs_inode_util.c | 6 ++++++ fs/xfs/libxfs/xfs_sb.c | 2 ++ fs/xfs/xfs_buf.c | 7 +++++++ fs/xfs/xfs_buf.h | 3 +++ fs/xfs/xfs_inode.h | 5 +++++ fs/xfs/xfs_ioctl.c | 27 +++++++++++++++++++++++++++ fs/xfs/xfs_mount.h | 2 ++ fs/xfs/xfs_super.c | 4 ++++ include/uapi/linux/fs.h | 1 + 11 files changed, 88 insertions(+), 2 deletions(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index e1bfee0c3b1a..ed5e5442f0d4 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -352,11 +352,15 @@ xfs_sb_has_compat_feature( #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ +#define XFS_SB_FEAT_RO_COMPAT_ATOMICWRITES (1 << 31) /* atomicwrites enabl= ed */ + #define XFS_SB_FEAT_RO_COMPAT_ALL \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ XFS_SB_FEAT_RO_COMPAT_REFLINK| \ - XFS_SB_FEAT_RO_COMPAT_INOBTCNT) + XFS_SB_FEAT_RO_COMPAT_INOBTCNT | \ + XFS_SB_FEAT_RO_COMPAT_ATOMICWRITES) + #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL static inline bool xfs_sb_has_ro_compat_feature( @@ -1093,16 +1097,19 @@ static inline void xfs_dinode_put_rdev(struct xfs_d= inode *dip, xfs_dev_t rdev) #define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint = */ #define XFS_DIFLAG2_BIGTIME_BIT 3 /* big timestamps */ #define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */ +#define XFS_DIFLAG2_ATOMICWRITES_BIT 5 /* atomic writes permitted */ =20 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) #define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT) #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT) #define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT) +#define XFS_DIFLAG2_ATOMICWRITES (1 << XFS_DIFLAG2_ATOMICWRITES_BIT) =20 #define XFS_DIFLAG2_ANY \ (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ - XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64) + XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | \ + XFS_DIFLAG2_ATOMICWRITES) =20 static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) { diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index 79babeac9d75..7fe94d038e83 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -483,6 +483,22 @@ xfs_dinode_verify_nrext64( return NULL; } =20 +static xfs_failaddr_t +xfs_inode_validate_atomicwrites( + struct xfs_mount *mp, + uint16_t mode) +{ + /* superblock rocompat feature flag */ + if (!xfs_has_atomicwrites(mp)) + return __this_address; + + /* Only regular files and directories */ + if (!S_ISREG(mode) && !(S_ISDIR(mode))) + return __this_address; + + return NULL; +} + xfs_failaddr_t xfs_dinode_verify( struct xfs_mount *mp, @@ -663,6 +679,12 @@ xfs_dinode_verify( !xfs_has_bigtime(mp)) return __this_address; =20 + if (flags2 & XFS_DIFLAG2_ATOMICWRITES) { + fa =3D xfs_inode_validate_atomicwrites(mp, mode); + if (fa) + return fa; + } + return NULL; } =20 diff --git a/fs/xfs/libxfs/xfs_inode_util.c b/fs/xfs/libxfs/xfs_inode_util.c index cc38e1c3c3e1..e59e98783bf7 100644 --- a/fs/xfs/libxfs/xfs_inode_util.c +++ b/fs/xfs/libxfs/xfs_inode_util.c @@ -80,6 +80,8 @@ xfs_flags2diflags2( di_flags2 |=3D XFS_DIFLAG2_DAX; if (xflags & FS_XFLAG_COWEXTSIZE) di_flags2 |=3D XFS_DIFLAG2_COWEXTSIZE; + if (xflags & FS_XFLAG_ATOMICWRITES) + di_flags2 |=3D XFS_DIFLAG2_ATOMICWRITES; =20 return di_flags2; } @@ -126,6 +128,8 @@ xfs_ip2xflags( flags |=3D FS_XFLAG_DAX; if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) flags |=3D FS_XFLAG_COWEXTSIZE; + if (ip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES) + flags |=3D FS_XFLAG_ATOMICWRITES; } =20 if (xfs_inode_has_attr_fork(ip)) @@ -224,6 +228,8 @@ xfs_inode_inherit_flags2( } if (pip->i_diflags2 & XFS_DIFLAG2_DAX) ip->i_diflags2 |=3D XFS_DIFLAG2_DAX; + if (pip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES) + ip->i_diflags2 |=3D XFS_DIFLAG2_ATOMICWRITES; =20 /* Don't let invalid cowextsize hints propagate. */ failaddr =3D xfs_inode_validate_cowextsize(ip->i_mount, ip->i_cowextsize, diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index d95409f3cba6..dd819561d0a5 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -164,6 +164,8 @@ xfs_sb_version_to_features( features |=3D XFS_FEAT_REFLINK; if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT) features |=3D XFS_FEAT_INOBTCNT; + if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_ATOMICWRITES) + features |=3D XFS_FEAT_ATOMICWRITES; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) features |=3D XFS_FEAT_FTYPE; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index aa4dbda7b536..e279e5e139ff 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -2115,6 +2115,13 @@ xfs_alloc_buftarg( btp->bt_daxdev =3D fs_dax_get_by_bdev(btp->bt_bdev, &btp->bt_dax_part_off, mp, ops); =20 + if (bdev_can_atomic_write(btp->bt_bdev)) { + struct request_queue *q =3D bdev_get_queue(btp->bt_bdev); + + btp->bt_bdev_awu_min =3D queue_atomic_write_unit_min_bytes(q); + btp->bt_bdev_awu_max =3D queue_atomic_write_unit_max_bytes(q); + } + /* * When allocating the buftargs we have not yet read the super block and * thus don't know the file system sector size yet. diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 209a389f2abc..2be28bd01087 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -124,6 +124,9 @@ struct xfs_buftarg { struct percpu_counter bt_io_count; struct ratelimit_state bt_ioerror_rl; =20 + /* Atomic write unit values */ + unsigned int bt_bdev_awu_min, bt_bdev_awu_max; + /* built-in cache, if we're not using the perag one */ struct xfs_buf_cache bt_cache[]; }; diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 97ed912306fd..1c62ee294a5a 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -327,6 +327,11 @@ static inline bool xfs_inode_has_bigrtalloc(struct xfs= _inode *ip) (XFS_IS_REALTIME_INODE(ip) ? \ (ip)->i_mount->m_rtdev_targp : (ip)->i_mount->m_ddev_targp) =20 +static inline bool xfs_inode_has_atomicwrites(struct xfs_inode *ip) +{ + return ip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES; +} + /* * In-core inode flags. */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index a20d426ef021..1c980c863ada 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -469,6 +469,26 @@ xfs_fileattr_get( return 0; } =20 +static int +xfs_ioctl_setattr_atomicwrites( + struct xfs_inode *ip) +{ + struct xfs_buftarg *target =3D xfs_inode_buftarg(ip); + struct xfs_mount *mp =3D ip->i_mount; + struct xfs_sb *sbp =3D &mp->m_sb; + + if (!xfs_has_atomicwrites(mp)) + return -EINVAL; + + if (target->bt_bdev_awu_min > sbp->sb_blocksize) + return -EINVAL; + + if (target->bt_bdev_awu_max < sbp->sb_blocksize) + return -EINVAL; + + return 0; +} + static int xfs_ioctl_setattr_xflags( struct xfs_trans *tp, @@ -478,6 +498,7 @@ xfs_ioctl_setattr_xflags( struct xfs_mount *mp =3D ip->i_mount; bool rtflag =3D (fa->fsx_xflags & FS_XFLAG_REALTIME); uint64_t i_flags2; + int error; =20 if (rtflag !=3D XFS_IS_REALTIME_INODE(ip)) { /* Can't change realtime flag if any extents are allocated. */ @@ -512,6 +533,12 @@ xfs_ioctl_setattr_xflags( if (i_flags2 && !xfs_has_v3inodes(mp)) return -EINVAL; =20 + if (fa->fsx_xflags & FS_XFLAG_ATOMICWRITES) { + error =3D xfs_ioctl_setattr_atomicwrites(ip); + if (error) + return error; + } + ip->i_diflags =3D xfs_flags2diflags(ip, fa->fsx_xflags); ip->i_diflags2 =3D i_flags2; =20 diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 96496f39f551..6ac6518a2ef3 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -298,6 +298,7 @@ typedef struct xfs_mount { #define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */ #define XFS_FEAT_NREXT64 (1ULL << 26) /* large extent counters */ #define XFS_FEAT_EXCHANGE_RANGE (1ULL << 27) /* exchange range */ +#define XFS_FEAT_ATOMICWRITES (1ULL << 28) /* atomic writes support */ =20 /* Mount features */ #define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */ @@ -384,6 +385,7 @@ __XFS_ADD_V4_FEAT(projid32, PROJID32) __XFS_HAS_V4_FEAT(v3inodes, V3INODES) __XFS_HAS_V4_FEAT(crc, CRC) __XFS_HAS_V4_FEAT(pquotino, PQUOTINO) +__XFS_HAS_FEAT(atomicwrites, ATOMICWRITES) =20 /* * Mount features diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index fbb3a1594c0d..97c1d9493cdb 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1733,6 +1733,10 @@ xfs_fs_fill_super( mp->m_features &=3D ~XFS_FEAT_DISCARD; 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Use at your own risk!"); + if (xfs_has_reflink(mp)) { if (mp->m_sb.sb_rblocks) { xfs_alert(mp, diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 753971770733..e813217e0fe4 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -158,6 +158,7 @@ struct fsxattr { #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ +#define FS_XFLAG_ATOMICWRITES 0x00020000 /* atomic writes enabled */ #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ =20 /* the read-only stuff doesn't really belong here, but any other place is --=20 2.31.1 From nobody Thu Nov 28 04:47:49 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 0E7F014BF8A; 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Fri, 4 Oct 2024 09:23:29 +0000 From: John Garry To: axboe@kernel.dk, brauner@kernel.org, djwong@kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, dchinner@redhat.com, hch@lst.de, cem@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, hare@suse.de, martin.petersen@oracle.com, catherine.hoang@oracle.com, mcgrof@kernel.org, ritesh.list@gmail.com, ojaswin@linux.ibm.com, John Garry Subject: [PATCH v7 6/8] xfs: Support atomic write for statx Date: Fri, 4 Oct 2024 09:22:52 +0000 Message-Id: <20241004092254.3759210-7-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241004092254.3759210-1-john.g.garry@oracle.com> References: <20241004092254.3759210-1-john.g.garry@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0165.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18a::8) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|IA1PR10MB6900:EE_ X-MS-Office365-Filtering-Correlation-Id: 132148f4-8a75-4b4d-00cb-08dce4563519 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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charset="utf-8" Support providing info on atomic write unit min and max for an inode. For simplicity, currently we limit the min at the FS block size. As for max, we limit also at FS block size, as there is no current method to guarantee extent alignment or granularity for regular files. Reviewed-by: "Darrick J. Wong" Signed-off-by: John Garry --- fs/xfs/xfs_inode.h | 17 +++++++++++++++++ fs/xfs/xfs_iops.c | 25 +++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 1c62ee294a5a..1ea73402d592 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -332,6 +332,23 @@ static inline bool xfs_inode_has_atomicwrites(struct x= fs_inode *ip) return ip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES; } =20 +static inline bool +xfs_inode_can_atomicwrite( + struct xfs_inode *ip) +{ + struct xfs_mount *mp =3D ip->i_mount; + struct xfs_buftarg *target =3D xfs_inode_buftarg(ip); + + if (!xfs_inode_has_atomicwrites(ip)) + return false; + if (mp->m_sb.sb_blocksize < target->bt_bdev_awu_min) + return false; + if (mp->m_sb.sb_blocksize > target->bt_bdev_awu_max) + return false; + + return true; +} + /* * In-core inode flags. */ diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index ee79cf161312..919fbcb4b72a 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -570,6 +570,23 @@ xfs_stat_blksize( return max_t(uint32_t, PAGE_SIZE, mp->m_sb.sb_blocksize); 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Fri, 4 Oct 2024 09:23:32 +0000 From: John Garry To: axboe@kernel.dk, brauner@kernel.org, djwong@kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, dchinner@redhat.com, hch@lst.de, cem@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, hare@suse.de, martin.petersen@oracle.com, catherine.hoang@oracle.com, mcgrof@kernel.org, ritesh.list@gmail.com, ojaswin@linux.ibm.com, John Garry Subject: [PATCH v7 7/8] xfs: Validate atomic writes Date: Fri, 4 Oct 2024 09:22:53 +0000 Message-Id: <20241004092254.3759210-8-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241004092254.3759210-1-john.g.garry@oracle.com> References: <20241004092254.3759210-1-john.g.garry@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P265CA0118.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2c6::8) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|IA1PR10MB6900:EE_ X-MS-Office365-Filtering-Correlation-Id: fd20a228-37be-49ac-a686-08dce45636f7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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charset="utf-8" Validate that an atomic write adheres to length/offset rules. Currently we can only write a single FS block. For an IOCB with IOCB_ATOMIC set to get as far as xfs_file_write_iter(), FMODE_CAN_ATOMIC_WRITE will need to be set for the file; for this, ATOMICWRITES flags would also need to be set for the inode. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 412b1d71b52b..3a0a35e7826a 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -822,6 +822,14 @@ xfs_file_write_iter( if (IS_DAX(inode)) return xfs_file_dax_write(iocb, from); =20 + if (iocb->ki_flags & IOCB_ATOMIC) { + if (ocount !=3D ip->i_mount->m_sb.sb_blocksize) + return -EINVAL; + ret =3D generic_atomic_write_valid(iocb, from); + if (ret) + return ret; + } + if (iocb->ki_flags & IOCB_DIRECT) { /* * Allow a directio write to fall back to a buffered --=20 2.31.1 From nobody Thu Nov 28 04:47:49 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 5DC1A14D2B3; Fri, 4 Oct 2024 09:23:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" For when an inode is enabled for atomic writes, set FMODE_CAN_ATOMIC_WRITE flag. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 3a0a35e7826a..e4a3a9882b0a 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1217,6 +1217,8 @@ xfs_file_open( if (xfs_is_shutdown(XFS_M(inode->i_sb))) return -EIO; file->f_mode |=3D FMODE_NOWAIT | FMODE_CAN_ODIRECT; + if (xfs_inode_can_atomicwrite(XFS_I(inode))) + file->f_mode |=3D FMODE_CAN_ATOMIC_WRITE; return generic_file_open(inode, file); } =20 --=20 2.31.1