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Signed-off-by: John Garry --- We really should return -EINVAL to userspce, so can be have BLK_STS_INVAL or similar? block/blk-core.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/block/blk-core.c b/block/blk-core.c index de771093b526..a1b095a68498 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -718,6 +718,18 @@ void submit_bio_noacct_nocheck(struct bio *bio) __submit_bio_noacct(bio); } +static blk_status_t blk_validate_atomic_write_op_size(struct request_queue *q, + struct bio *bio) +{ + if (bio->bi_iter.bi_size > queue_atomic_write_unit_max_bytes(q)) + return BLK_STS_IOERR; + + if (bio->bi_iter.bi_size % queue_atomic_write_unit_min_bytes(q)) + return BLK_STS_IOERR; + + return BLK_STS_OK; +} + /** * submit_bio_noacct - re-submit a bio to the block device layer for I/O * @bio: The bio describing the location in memory and on the device. @@ -775,6 +787,11 @@ void submit_bio_noacct(struct bio *bio) switch (bio_op(bio)) { case REQ_OP_READ: case REQ_OP_WRITE: + if (bio->bi_opf & REQ_ATOMIC) { + status = blk_validate_atomic_write_op_size(q, bio); 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Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_bmap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index f362345467fa..60d100134280 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3584,6 +3584,10 @@ xfs_bmap_btalloc_low_space( { int error; + /* The allocator doesn't honour args->alignment */ + if (args->alignment > 1) + return 0; + if (args->minlen > ap->minlen) { args->minlen = ap->minlen; error = xfs_alloc_vextent_start_ag(args, ap->blkno); From patchwork Mon Mar 4 13:04:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580571 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 E2DF23F8C2; Mon, 4 Mar 2024 13:05:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wong" Add a new inode flag to require that all file data extent mappings must be aligned (both the file offset range and the allocated space itself) to the extent size hint. Having a separate COW extent size hint is no longer allowed. The goal here is to enable sysadmins and users to mandate that all space mappings in a file must have a startoff/blockcount that are aligned to (say) a 2MB alignment and that the startblock/blockcount will follow the same alignment. jpg: Enforce extsize is a power-of-2 for forcealign Signed-off-by: "Darrick J. Wong" Co-developed-by: John Garry Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_format.h | 6 +++++- fs/xfs/libxfs/xfs_inode_buf.c | 40 +++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_inode_buf.h | 3 +++ fs/xfs/libxfs/xfs_sb.c | 2 ++ fs/xfs/xfs_inode.c | 12 +++++++++++ fs/xfs/xfs_inode.h | 5 +++++ fs/xfs/xfs_ioctl.c | 34 ++++++++++++++++++++++++++++- fs/xfs/xfs_mount.h | 2 ++ fs/xfs/xfs_super.c | 4 ++++ include/uapi/linux/fs.h | 2 ++ 10 files changed, 108 insertions(+), 2 deletions(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 382ab1e71c0b..db2113cf6e47 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -353,6 +353,7 @@ 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_FORCEALIGN (1 << 30) /* aligned file data extents */ #define XFS_SB_FEAT_RO_COMPAT_ALL \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ @@ -1085,16 +1086,19 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *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 */ +/* data extent mappings for regular files must be aligned to extent size hint */ +#define XFS_DIFLAG2_FORCEALIGN_BIT 5 #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_FORCEALIGN (1 << XFS_DIFLAG2_FORCEALIGN_BIT) #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_FORCEALIGN) 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 137a65bda95d..61cc12cd54db 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -610,6 +610,14 @@ xfs_dinode_verify( !xfs_has_bigtime(mp)) return __this_address; + if (flags2 & XFS_DIFLAG2_FORCEALIGN) { + fa = xfs_inode_validate_forcealign(mp, mode, flags, + be32_to_cpu(dip->di_extsize), + be32_to_cpu(dip->di_cowextsize)); + if (fa) + return fa; + } + return NULL; } @@ -777,3 +785,35 @@ xfs_inode_validate_cowextsize( return NULL; } + +/* Validate the forcealign inode flag */ +xfs_failaddr_t +xfs_inode_validate_forcealign( + struct xfs_mount *mp, + uint16_t mode, + uint16_t flags, + uint32_t extsize, + uint32_t cowextsize) +{ + /* superblock rocompat feature flag */ + if (!xfs_has_forcealign(mp)) + return __this_address; + + /* Only regular files and directories */ + if (!S_ISDIR(mode) && !S_ISREG(mode)) + return __this_address; + + /* Doesn't apply to realtime files */ + if (flags & XFS_DIFLAG_REALTIME) + return __this_address; + + /* Requires a non-zero power-of-2 extent size hint */ + if (extsize == 0 || !is_power_of_2(extsize)) + return __this_address; + + /* Requires no cow extent size hint */ + if (cowextsize != 0) + return __this_address; + + return NULL; +} diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h index 585ed5a110af..50db17d22b68 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.h +++ b/fs/xfs/libxfs/xfs_inode_buf.h @@ -33,6 +33,9 @@ xfs_failaddr_t xfs_inode_validate_extsize(struct xfs_mount *mp, xfs_failaddr_t xfs_inode_validate_cowextsize(struct xfs_mount *mp, uint32_t cowextsize, uint16_t mode, uint16_t flags, uint64_t flags2); +xfs_failaddr_t xfs_inode_validate_forcealign(struct xfs_mount *mp, + uint16_t mode, uint16_t flags, uint32_t extsize, + uint32_t cowextsize); static inline uint64_t xfs_inode_encode_bigtime(struct timespec64 tv) { diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index 5bb6e2bd6dee..f2c16a028fae 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -163,6 +163,8 @@ xfs_sb_version_to_features( features |= XFS_FEAT_REFLINK; if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT) features |= XFS_FEAT_INOBTCNT; + if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FORCEALIGN) + features |= XFS_FEAT_FORCEALIGN; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) features |= XFS_FEAT_FTYPE; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 1fd94958aa97..2c439df8c47f 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -629,6 +629,8 @@ xfs_ip2xflags( flags |= FS_XFLAG_DAX; if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) flags |= FS_XFLAG_COWEXTSIZE; + if (ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN) + flags |= FS_XFLAG_FORCEALIGN; } if (xfs_inode_has_attr_fork(ip)) @@ -758,6 +760,8 @@ xfs_inode_inherit_flags2( } if (pip->i_diflags2 & XFS_DIFLAG2_DAX) ip->i_diflags2 |= XFS_DIFLAG2_DAX; + if (pip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN) + ip->i_diflags2 |= XFS_DIFLAG2_FORCEALIGN; /* Don't let invalid cowextsize hints propagate. */ failaddr = xfs_inode_validate_cowextsize(ip->i_mount, ip->i_cowextsize, @@ -766,6 +770,14 @@ xfs_inode_inherit_flags2( ip->i_diflags2 &= ~XFS_DIFLAG2_COWEXTSIZE; ip->i_cowextsize = 0; } + + if (ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN) { + failaddr = xfs_inode_validate_forcealign(ip->i_mount, + VFS_I(ip)->i_mode, ip->i_diflags, ip->i_extsize, + ip->i_cowextsize); + if (failaddr) + ip->i_diflags2 &= ~XFS_DIFLAG2_FORCEALIGN; + } } /* diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 97f63bacd4c2..82e2838f6d64 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -305,6 +305,11 @@ static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip) return ip->i_diflags2 & XFS_DIFLAG2_NREXT64; } +static inline bool xfs_inode_forcealign(struct xfs_inode *ip) +{ + return ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN; +} + /* * Return the buftarg used for data allocations on a given inode. */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index f02b6e558af5..867d8d51a3d0 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1110,6 +1110,8 @@ xfs_flags2diflags2( di_flags2 |= XFS_DIFLAG2_DAX; if (xflags & FS_XFLAG_COWEXTSIZE) di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; + if (xflags & FS_XFLAG_FORCEALIGN) + di_flags2 |= XFS_DIFLAG2_FORCEALIGN; return di_flags2; } @@ -1146,6 +1148,22 @@ xfs_ioctl_setattr_xflags( if (i_flags2 && !xfs_has_v3inodes(mp)) return -EINVAL; + /* + * Force-align requires a nonzero extent size hint and a zero cow + * extent size hint. It doesn't apply to realtime files. + */ + if (fa->fsx_xflags & FS_XFLAG_FORCEALIGN) { + if (!xfs_has_forcealign(mp)) + return -EINVAL; + if (fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) + return -EINVAL; + if (!(fa->fsx_xflags & (FS_XFLAG_EXTSIZE | + FS_XFLAG_EXTSZINHERIT))) + return -EINVAL; + if (fa->fsx_xflags & FS_XFLAG_REALTIME) + return -EINVAL; + } + ip->i_diflags = xfs_flags2diflags(ip, fa->fsx_xflags); ip->i_diflags2 = i_flags2; @@ -1232,6 +1250,7 @@ xfs_ioctl_setattr_check_extsize( struct xfs_mount *mp = ip->i_mount; xfs_failaddr_t failaddr; uint16_t new_diflags; + uint16_t new_diflags2; if (!fa->fsx_valid) return 0; @@ -1244,6 +1263,7 @@ xfs_ioctl_setattr_check_extsize( return -EINVAL; new_diflags = xfs_flags2diflags(ip, fa->fsx_xflags); + new_diflags2 = xfs_flags2diflags2(ip, fa->fsx_xflags); /* * Inode verifiers do not check that the extent size hint is an integer @@ -1263,7 +1283,19 @@ xfs_ioctl_setattr_check_extsize( failaddr = xfs_inode_validate_extsize(ip->i_mount, XFS_B_TO_FSB(mp, fa->fsx_extsize), VFS_I(ip)->i_mode, new_diflags); - return failaddr != NULL ? -EINVAL : 0; + if (failaddr) + return -EINVAL; + + if (new_diflags2 & XFS_DIFLAG2_FORCEALIGN) { + failaddr = xfs_inode_validate_forcealign(ip->i_mount, + VFS_I(ip)->i_mode, new_diflags, + XFS_B_TO_FSB(mp, fa->fsx_extsize), + XFS_B_TO_FSB(mp, fa->fsx_cowextsize)); + if (failaddr) + return -EINVAL; + } + + return 0; } static int diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 503fe3c7edbf..e1ef31675db3 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -289,6 +289,7 @@ typedef struct xfs_mount { #define XFS_FEAT_BIGTIME (1ULL << 24) /* large timestamps */ #define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */ #define XFS_FEAT_NREXT64 (1ULL << 26) /* large extent counters */ +#define XFS_FEAT_FORCEALIGN (1ULL << 27) /* aligned file data extents */ /* Mount features */ #define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */ @@ -352,6 +353,7 @@ __XFS_HAS_FEAT(inobtcounts, INOBTCNT) __XFS_HAS_FEAT(bigtime, BIGTIME) __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR) __XFS_HAS_FEAT(large_extent_counts, NREXT64) +__XFS_HAS_FEAT(forcealign, FORCEALIGN) /* * Mount features diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 5a2512d20bd0..74dcafddf6a9 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1708,6 +1708,10 @@ xfs_fs_fill_super( mp->m_features &= ~XFS_FEAT_DISCARD; } + if (xfs_has_forcealign(mp)) + xfs_warn(mp, +"EXPERIMENTAL forced data extent alignment feature in use. 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 a0975ae81e64..8828822331bf 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -140,6 +140,8 @@ 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 */ +/* data extent mappings for regular files must be aligned to extent size hint */ +#define FS_XFLAG_FORCEALIGN 0x00020000 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ /* the read-only stuff doesn't really belong here, but any other place is From patchwork Mon Mar 4 13:04:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580570 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (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 2EF3F3D98D; 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Mon, 4 Mar 2024 13:05:06 +0000 From: John Garry To: djwong@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, chandan.babu@oracle.com, david@fromorbit.com, axboe@kernel.dk Cc: martin.petersen@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, linux-block@vger.kernel.org, John Garry Subject: [PATCH v2 04/14] fs: xfs: Make file data allocations observe the 'forcealign' flag Date: Mon, 4 Mar 2024 13:04:18 +0000 Message-Id: <20240304130428.13026-5-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240304130428.13026-1-john.g.garry@oracle.com> References: <20240304130428.13026-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR05CA0198.namprd05.prod.outlook.com (2603:10b6:a03:330::23) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB7805:EE_ X-MS-Office365-Filtering-Correlation-Id: 9645b6ab-b197-41ff-74c3-08dc3c4bb666 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Wong" The existing extsize hint code already did the work of expanding file range mapping requests so that the range is aligned to the hint value. Now add the code we need to guarantee that the space allocations are also always aligned. XXX: still need to check all this with reflink Signed-off-by: "Darrick J. Wong" Co-developed-by: John Garry Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_bmap.c | 22 +++++++++++++++++----- fs/xfs/xfs_iomap.c | 4 +++- 2 files changed, 20 insertions(+), 6 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 60d100134280..8dee60795cf4 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3343,6 +3343,19 @@ xfs_bmap_compute_alignments( align = xfs_get_cowextsz_hint(ap->ip); else if (ap->datatype & XFS_ALLOC_USERDATA) align = xfs_get_extsz_hint(ap->ip); + + /* + * xfs_get_cowextsz_hint() returns extsz_hint for when forcealign is + * set as forcealign and cowextsz_hint are mutually exclusive + */ + if (xfs_inode_forcealign(ap->ip) && align) { + args->alignment = align; + if (stripe_align % align) + stripe_align = align; + } else { + args->alignment = 1; + } + if (align) { if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0, ap->eof, 0, ap->conv, &ap->offset, @@ -3438,7 +3451,6 @@ xfs_bmap_exact_minlen_extent_alloc( args.minlen = args.maxlen = ap->minlen; args.total = ap->total; - args.alignment = 1; args.minalignslop = 0; args.minleft = ap->minleft; @@ -3484,6 +3496,7 @@ xfs_bmap_btalloc_at_eof( { struct xfs_mount *mp = args->mp; struct xfs_perag *caller_pag = args->pag; + int orig_alignment = args->alignment; int error; /* @@ -3558,10 +3571,10 @@ xfs_bmap_btalloc_at_eof( /* * Allocation failed, so turn return the allocation args to their - * original non-aligned state so the caller can proceed on allocation - * failure as if this function was never called. + * original state so the caller can proceed on allocation failure as + * if this function was never called. */ - args->alignment = 1; + args->alignment = orig_alignment; return 0; } @@ -3709,7 +3722,6 @@ xfs_bmap_btalloc( .wasdel = ap->wasdel, .resv = XFS_AG_RESV_NONE, .datatype = ap->datatype, - .alignment = 1, .minalignslop = 0, }; xfs_fileoff_t orig_offset; diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 18c8f168b153..70fe873951f3 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -181,7 +181,9 @@ xfs_eof_alignment( * If mounted with the "-o swalloc" option the alignment is * increased from the strip unit size to the stripe width. */ - if (mp->m_swidth && xfs_has_swalloc(mp)) + if (xfs_inode_forcealign(ip)) + align = xfs_get_extsz_hint(ip); 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Wong" Enable this feature. Signed-off-by: "Darrick J. Wong" Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_format.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index db2113cf6e47..2d9f5430efc3 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -358,7 +358,8 @@ xfs_sb_has_compat_feature( (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_FORCEALIGN) #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL static inline bool xfs_sb_has_ro_compat_feature( From patchwork Mon Mar 4 13:04:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580573 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 7EEEE40876; 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Mon, 4 Mar 2024 13:05:10 +0000 From: John Garry To: djwong@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, chandan.babu@oracle.com, david@fromorbit.com, axboe@kernel.dk Cc: martin.petersen@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, linux-block@vger.kernel.org, John Garry Subject: [PATCH v2 06/14] fs: xfs: Do not free EOF blocks for forcealign Date: Mon, 4 Mar 2024 13:04:20 +0000 Message-Id: <20240304130428.13026-7-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240304130428.13026-1-john.g.garry@oracle.com> References: <20240304130428.13026-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ2PR07CA0021.namprd07.prod.outlook.com (2603:10b6:a03:505::23) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB7805:EE_ X-MS-Office365-Filtering-Correlation-Id: e1e2e536-adfd-4b23-4956-08dc3c4bb90c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Add helper function xfs_get_extsz() to get the guaranteed extent size alignment for forcealign enabled. Since this code is only relevant to forcealign and forcealign is not possible for RT yet, ignore RT. Signed-off-by: John Garry --- fs/xfs/xfs_bmap_util.c | 7 ++++++- fs/xfs/xfs_inode.c | 14 ++++++++++++++ fs/xfs/xfs_inode.h | 1 + 3 files changed, 21 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index c2531c28905c..07bfb03c671a 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -542,8 +542,13 @@ xfs_can_free_eofblocks( * forever. */ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); - if (XFS_IS_REALTIME_INODE(ip) && mp->m_sb.sb_rextsize > 1) + + /* Do not free blocks when forcing extent sizes */ + if (xfs_get_extsz(ip) > 1) + end_fsb = roundup_64(end_fsb, xfs_get_extsz(ip)); + else if (XFS_IS_REALTIME_INODE(ip) && mp->m_sb.sb_rextsize > 1) end_fsb = xfs_rtb_roundup_rtx(mp, end_fsb); + last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); if (last_fsb <= end_fsb) return false; diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 2c439df8c47f..bbb8886f1d32 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -65,6 +65,20 @@ xfs_get_extsz_hint( return 0; } +/* + * Helper function to extract extent size. It will return a power-of-2, + * as forcealign requires this. + */ +xfs_extlen_t +xfs_get_extsz( + struct xfs_inode *ip) +{ + if (xfs_inode_forcealign(ip) && ip->i_extsize) + return ip->i_extsize; + + return 1; +} + /* * Helper function to extract CoW extent size hint from inode. * Between the extent size hint and the CoW extent size hint, we diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 82e2838f6d64..b6c42c27943e 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -547,6 +547,7 @@ void xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode, struct xfs_inode *ip1, uint ip1_mode); xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip); +xfs_extlen_t xfs_get_extsz(struct xfs_inode *ip); xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip); int xfs_init_new_inode(struct mnt_idmap *idmap, struct xfs_trans *tp, From patchwork Mon Mar 4 13:04:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580575 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 28B5A40BFE; 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Mon, 4 Mar 2024 13:05:12 +0000 From: John Garry To: djwong@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, chandan.babu@oracle.com, david@fromorbit.com, axboe@kernel.dk Cc: martin.petersen@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, linux-block@vger.kernel.org, John Garry Subject: [PATCH v2 07/14] fs: iomap: Sub-extent zeroing Date: Mon, 4 Mar 2024 13:04:21 +0000 Message-Id: <20240304130428.13026-8-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240304130428.13026-1-john.g.garry@oracle.com> References: <20240304130428.13026-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR05CA0198.namprd05.prod.outlook.com (2603:10b6:a03:330::23) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB7805:EE_ X-MS-Office365-Filtering-Correlation-Id: 9a1aa76a-7a4b-41b8-91f8-08dc3c4bba5f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This will be important for atomic writes support, in that atomically writing over a partially written extent would mean that we would need to do the unwritten extent conversion write separately, and the write could no longer be atomic. It is the task of the FS to set iomap.extent_shift per iter to indicate sub-extent zeroing required. Maybe a macro like i_blocksize() should be introduced for extent sizes, instead of using extent_shift. It would also eliminate excessive use of xfs_get_extss() for XFS in future. Signed-off-by: John Garry --- fs/iomap/direct-io.c | 14 ++++++++------ include/linux/iomap.h | 1 + 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index bcd3f8cf5ea4..733f83f839b6 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -277,7 +277,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, { const struct iomap *iomap = &iter->iomap; struct inode *inode = iter->inode; - unsigned int fs_block_size = i_blocksize(inode), pad; + unsigned int zeroing_size, pad; loff_t length = iomap_length(iter); loff_t pos = iter->pos; blk_opf_t bio_opf; @@ -288,6 +288,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, size_t copied = 0; size_t orig_count; + zeroing_size = i_blocksize(inode) << iomap->extent_shift; + if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1) || !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter)) return -EINVAL; @@ -354,8 +356,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, dio->iocb->ki_flags &= ~IOCB_HIPRI; if (need_zeroout) { - /* zero out from the start of the block to the write offset */ - pad = pos & (fs_block_size - 1); + /* zero out from the start of the region to the write offset */ + pad = pos & (zeroing_size - 1); if (pad) iomap_dio_zero(iter, dio, pos - pad, pad); } @@ -427,10 +429,10 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, zero_tail: if (need_zeroout || ((dio->flags & IOMAP_DIO_WRITE) && pos >= i_size_read(inode))) { - /* zero out from the end of the write to the end of the block */ - pad = pos & (fs_block_size - 1); + /* zero out from the end of the write to the end of the region */ + pad = pos & (zeroing_size - 1); if (pad) - iomap_dio_zero(iter, dio, pos, fs_block_size - pad); + iomap_dio_zero(iter, dio, pos, zeroing_size - pad); } out: /* Undo iter limitation to current extent */ diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 96dd0acbba44..89cd3dcbb8ec 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -97,6 +97,7 @@ struct iomap { u64 length; 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We treat a sub-extent write same as an unaligned write, so we can leverage the existing sub-FSblock unaligned write support, i.e. try a shared lock with IOMAP_DIO_OVERWRITE_ONLY flag, if this fails then try the exclusive lock. In xfs_iomap_write_unwritten(), FSB calcs are now based on the extsize. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 28 +++++++++++++++------------- fs/xfs/xfs_iomap.c | 15 +++++++++++++-- 2 files changed, 28 insertions(+), 15 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index e33e5e13b95f..d0bd9d5f596c 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -617,18 +617,19 @@ xfs_file_dio_write_aligned( * Handle block unaligned direct I/O writes * * In most cases direct I/O writes will be done holding IOLOCK_SHARED, allowing - * them to be done in parallel with reads and other direct I/O writes. However, - * if the I/O is not aligned to filesystem blocks, the direct I/O layer may need - * to do sub-block zeroing and that requires serialisation against other direct - * I/O to the same block. In this case we need to serialise the submission of - * the unaligned I/O so that we don't get racing block zeroing in the dio layer. - * In the case where sub-block zeroing is not required, we can do concurrent - * sub-block dios to the same block successfully. + * them to be done in parallel with reads and other direct I/O writes. + * However if the I/O is not aligned to filesystem blocks/extent, the direct + * I/O layer may need to do sub-block/extent zeroing and that requires + * serialisation against other direct I/O to the same block/extent. In this + * case we need to serialise the submission of the unaligned I/O so that we + * don't get racing block/extent zeroing in the dio layer. + * In the case where sub-block/extent zeroing is not required, we can do + * concurrent sub-block/extent dios to the same block/extent successfully. * * Optimistically submit the I/O using the shared lock first, but use the * IOMAP_DIO_OVERWRITE_ONLY flag to tell the lower layers to return -EAGAIN - * if block allocation or partial block zeroing would be required. In that case - * we try again with the exclusive lock. + * if block/extent allocation or partial block/extent zeroing would be + * required. In that case we try again with the exclusive lock. */ static noinline ssize_t xfs_file_dio_write_unaligned( @@ -643,9 +644,9 @@ xfs_file_dio_write_unaligned( ssize_t ret; /* - * Extending writes need exclusivity because of the sub-block zeroing - * that the DIO code always does for partial tail blocks beyond EOF, so - * don't even bother trying the fast path in this case. + * Extending writes need exclusivity because of the sub-block/extent + * zeroing that the DIO code always does for partial tail blocks + * beyond EOF, so don't even bother trying the fast path in this case. */ if (iocb->ki_pos > isize || iocb->ki_pos + count >= isize) { if (iocb->ki_flags & IOCB_NOWAIT) @@ -709,13 +710,14 @@ xfs_file_dio_write( struct iov_iter *from) { struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); + struct xfs_mount *mp = ip->i_mount; struct xfs_buftarg *target = xfs_inode_buftarg(ip); size_t count = iov_iter_count(from); /* direct I/O must be aligned to device logical sector size */ if ((iocb->ki_pos | count) & target->bt_logical_sectormask) return -EINVAL; - if ((iocb->ki_pos | count) & ip->i_mount->m_blockmask) + if ((iocb->ki_pos | count) & (XFS_FSB_TO_B(mp, xfs_get_extsz(ip)) - 1)) return xfs_file_dio_write_unaligned(ip, iocb, from); return xfs_file_dio_write_aligned(ip, iocb, from); } diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 70fe873951f3..88cc20bb19c9 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -98,6 +98,7 @@ xfs_bmbt_to_iomap( { struct xfs_mount *mp = ip->i_mount; struct xfs_buftarg *target = xfs_inode_buftarg(ip); + xfs_extlen_t extsz = xfs_get_extsz(ip); if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock))) return xfs_alert_fsblock_zero(ip, imap); @@ -134,6 +135,8 @@ xfs_bmbt_to_iomap( iomap->validity_cookie = sequence_cookie; iomap->folio_ops = &xfs_iomap_folio_ops; + if (extsz > 1) + iomap->extent_shift = ffs(extsz) - 1; return 0; } @@ -563,11 +566,19 @@ xfs_iomap_write_unwritten( xfs_fsize_t i_size; uint resblks; int error; + xfs_extlen_t extsz = xfs_get_extsz(ip); trace_xfs_unwritten_convert(ip, offset, count); 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This 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. Signed-off-by: John Garry --- include/uapi/linux/fs.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 8828822331bf..aacf54381718 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -142,6 +142,7 @@ struct fsxattr { #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ /* data extent mappings for regular files must be aligned to extent size hint */ #define FS_XFLAG_FORCEALIGN 0x00020000 +#define FS_XFLAG_ATOMICWRITES 0x00040000 /* atomic writes enabled */ #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ /* the read-only stuff doesn't really belong here, but any other place is From patchwork Mon Mar 4 13:04:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580579 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 3C8AC3E479; 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Mon, 4 Mar 2024 13:05:19 +0000 From: John Garry To: djwong@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, chandan.babu@oracle.com, david@fromorbit.com, axboe@kernel.dk Cc: martin.petersen@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, linux-block@vger.kernel.org, John Garry Subject: [PATCH v2 10/14] fs: iomap: Atomic write support Date: Mon, 4 Mar 2024 13:04:24 +0000 Message-Id: <20240304130428.13026-11-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240304130428.13026-1-john.g.garry@oracle.com> References: <20240304130428.13026-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR03CA0293.namprd03.prod.outlook.com (2603:10b6:a03:39e::28) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB6860:EE_ X-MS-Office365-Filtering-Correlation-Id: 4a4c495d-046f-4c68-b901-08dc3c4bbe2d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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We rely on the FS to guarantee extent alignment, such that an atomic write should never straddle two or more extents. The FS should also check for validity of an atomic write length/alignment. Signed-off-by: John Garry --- fs/iomap/direct-io.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 733f83f839b6..197f1bb6a261 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -275,6 +275,7 @@ static inline blk_opf_t iomap_dio_bio_opflags(struct iomap_dio *dio, static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, struct iomap_dio *dio) { + bool is_atomic = dio->iocb->ki_flags & IOCB_ATOMIC; const struct iomap *iomap = &iter->iomap; struct inode *inode = iter->inode; unsigned int zeroing_size, pad; @@ -383,6 +384,9 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, GFP_KERNEL); bio->bi_iter.bi_sector = iomap_sector(iomap, pos); bio->bi_ioprio = dio->iocb->ki_ioprio; + if (is_atomic) + bio->bi_opf |= REQ_ATOMIC; + bio->bi_private = dio; bio->bi_end_io = iomap_dio_bio_end_io; @@ -399,6 +403,12 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, } n = bio->bi_iter.bi_size; + if (is_atomic && (n != orig_count)) { + /* This bio should have covered the complete length */ + ret = -EINVAL; + bio_put(bio); + goto out; + } if (dio->flags & IOMAP_DIO_WRITE) { task_io_account_write(n); } else { From patchwork Mon Mar 4 13:04:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13580580 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 18A813F8E6; Mon, 4 Mar 2024 13:07:41 +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=1709557662; cv=fail; b=TDBwBkV4OeqdlaDcH6UOIouR6RYQtR5qb5nidrJNPOH4JQoUwUTqvNt5NPFKyAKd/ijj2Jf7ltpjmWew6x6fSF3qqe97ofovqOl1WfsYqe0mom+QFLTd02rOTGu+P9rCleSqoDLlYsOJk5FFPcoD+PFrOtKEsg96Eq+xIXJ8Oqo= ARC-Message-Signature: i=2; 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Current kernel support for atomic writes is based on HW support (for atomic writes). As such, it is required to ensure extent alignment with atomic_write_unit_max so that an atomic write can result in a single HW-compliant IO operation. rtvol also guarantees extent alignment, but we are basing support initially on forcealign, which is not supported for rtvol yet. Signed-off-by: John Garry --- fs/xfs/libxfs/xfs_format.h | 13 ++++++++++--- fs/xfs/libxfs/xfs_sb.c | 2 ++ fs/xfs/xfs_inode.c | 2 ++ fs/xfs/xfs_inode.h | 5 +++++ fs/xfs/xfs_ioctl.c | 15 +++++++++++++-- fs/xfs/xfs_mount.h | 2 ++ fs/xfs/xfs_super.c | 4 ++++ 7 files changed, 38 insertions(+), 5 deletions(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 2d9f5430efc3..5f54f9b3755e 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -354,12 +354,16 @@ xfs_sb_has_compat_feature( #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_FORCEALIGN (1 << 30) /* aligned file data extents */ +#define XFS_SB_FEAT_RO_COMPAT_ATOMICWRITES (1 << 31) /* atomicwrites enabled */ + #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_FORCEALIGN) + XFS_SB_FEAT_RO_COMPAT_INOBTCNT| \ + XFS_SB_FEAT_RO_COMPAT_FORCEALIGN| \ + 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( @@ -1089,6 +1093,7 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) #define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */ /* data extent mappings for regular files must be aligned to extent size hint */ #define XFS_DIFLAG2_FORCEALIGN_BIT 5 +#define XFS_DIFLAG2_ATOMICWRITES_BIT 6 #define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) #define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT) @@ -1096,10 +1101,12 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) #define XFS_DIFLAG2_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT) #define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT) #define XFS_DIFLAG2_FORCEALIGN (1 << XFS_DIFLAG2_FORCEALIGN_BIT) +#define XFS_DIFLAG2_ATOMICWRITES (1 << XFS_DIFLAG2_ATOMICWRITES_BIT) #define XFS_DIFLAG2_ANY \ (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \ - XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | XFS_DIFLAG2_FORCEALIGN) + XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | XFS_DIFLAG2_FORCEALIGN | \ + XFS_DIFLAG2_ATOMICWRITES) static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip) { diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index f2c16a028fae..d7bb3e34dd69 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -165,6 +165,8 @@ xfs_sb_version_to_features( features |= XFS_FEAT_INOBTCNT; if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FORCEALIGN) features |= XFS_FEAT_FORCEALIGN; + if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_ATOMICWRITES) + features |= XFS_FEAT_ATOMICWRITES; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE) features |= XFS_FEAT_FTYPE; if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index bbb8886f1d32..14020ab1450c 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -645,6 +645,8 @@ xfs_ip2xflags( flags |= FS_XFLAG_COWEXTSIZE; if (ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN) flags |= FS_XFLAG_FORCEALIGN; + if (ip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES) + flags |= FS_XFLAG_ATOMICWRITES; } if (xfs_inode_has_attr_fork(ip)) diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index b6c42c27943e..f56bdbb74ad7 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -310,6 +310,11 @@ static inline bool xfs_inode_forcealign(struct xfs_inode *ip) return ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN; } +static inline bool xfs_inode_atomicwrites(struct xfs_inode *ip) +{ + return ip->i_diflags2 & XFS_DIFLAG2_ATOMICWRITES; +} + /* * Return the buftarg used for data allocations on a given inode. */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 867d8d51a3d0..f118a1ae39b5 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1112,6 +1112,8 @@ xfs_flags2diflags2( di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; if (xflags & FS_XFLAG_FORCEALIGN) di_flags2 |= XFS_DIFLAG2_FORCEALIGN; + if (xflags & FS_XFLAG_ATOMICWRITES) + di_flags2 |= XFS_DIFLAG2_ATOMICWRITES; return di_flags2; } @@ -1124,10 +1126,12 @@ xfs_ioctl_setattr_xflags( { struct xfs_mount *mp = ip->i_mount; bool rtflag = (fa->fsx_xflags & FS_XFLAG_REALTIME); + bool atomic_writes = fa->fsx_xflags & FS_XFLAG_ATOMICWRITES; uint64_t i_flags2; - if (rtflag != XFS_IS_REALTIME_INODE(ip)) { - /* Can't change realtime flag if any extents are allocated. */ + /* Can't change RT or atomic flags if any extents are allocated. */ + if (rtflag != XFS_IS_REALTIME_INODE(ip) || + atomic_writes != xfs_inode_atomicwrites(ip)) { if (ip->i_df.if_nextents || ip->i_delayed_blks) return -EINVAL; } @@ -1164,6 +1168,13 @@ xfs_ioctl_setattr_xflags( return -EINVAL; } + if (atomic_writes) { + if (!xfs_has_atomicwrites(mp)) + return -EINVAL; + if (!(fa->fsx_xflags & FS_XFLAG_FORCEALIGN)) + return -EINVAL; + } + ip->i_diflags = xfs_flags2diflags(ip, fa->fsx_xflags); ip->i_diflags2 = i_flags2; diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index e1ef31675db3..3b60d8a1d396 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -290,6 +290,7 @@ 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_FORCEALIGN (1ULL << 27) /* aligned file data extents */ +#define XFS_FEAT_ATOMICWRITES (1ULL << 28) /* atomic writes support */ /* Mount features */ #define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */ @@ -354,6 +355,7 @@ __XFS_HAS_FEAT(bigtime, BIGTIME) __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR) __XFS_HAS_FEAT(large_extent_counts, NREXT64) __XFS_HAS_FEAT(forcealign, FORCEALIGN) +__XFS_HAS_FEAT(atomicwrites, ATOMICWRITES) /* * Mount features diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 74dcafddf6a9..efe4b4234b2e 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1712,6 +1712,10 @@ xfs_fs_fill_super( xfs_warn(mp, "EXPERIMENTAL forced data extent alignment feature in use. Use at your own risk!"); + if (xfs_has_atomicwrites(mp)) + xfs_warn(mp, +"EXPERIMENTAL atomicwrites feature in use. 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For simplicity, currently we limit the min at the FS block size, but a lower limit could be supported in future. This is required by iomap DIO. The atomic write unit min and max is limited by the guaranteed extent alignment for the inode. Signed-off-by: John Garry --- fs/xfs/xfs_iops.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index a0d77f5f512e..6316448083d2 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -546,6 +546,37 @@ xfs_stat_blksize( return PAGE_SIZE; } +static void +xfs_get_atomic_write_attr( + struct xfs_inode *ip, + unsigned int *unit_min, + unsigned int *unit_max) +{ + xfs_extlen_t extsz = xfs_get_extsz(ip); + struct xfs_buftarg *target = xfs_inode_buftarg(ip); + struct block_device *bdev = target->bt_bdev; + struct request_queue *q = bdev->bd_queue; + struct xfs_mount *mp = ip->i_mount; + struct xfs_sb *sbp = &mp->m_sb; + unsigned int awu_min, awu_max; + unsigned int extsz_bytes = XFS_FSB_TO_B(mp, extsz); + + awu_min = queue_atomic_write_unit_min_bytes(q); + awu_max = queue_atomic_write_unit_max_bytes(q); + + if (sbp->sb_blocksize > awu_max || awu_min > sbp->sb_blocksize || + !xfs_inode_atomicwrites(ip)) { + *unit_min = 0; 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Mon, 4 Mar 2024 13:05:25 +0000 From: John Garry To: djwong@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, chandan.babu@oracle.com, david@fromorbit.com, axboe@kernel.dk Cc: martin.petersen@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, linux-block@vger.kernel.org, John Garry Subject: [PATCH v2 13/14] fs: xfs: Validate atomic writes Date: Mon, 4 Mar 2024 13:04:27 +0000 Message-Id: <20240304130428.13026-14-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240304130428.13026-1-john.g.garry@oracle.com> References: <20240304130428.13026-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR03CA0193.namprd03.prod.outlook.com (2603:10b6:a03:2ef::18) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB6860:EE_ X-MS-Office365-Filtering-Correlation-Id: 11aeb72c-93f6-4dd2-a632-08dc3c4bc1c3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Since we require extent alignment for atomic writes, this effectively also enforces that the BIO which iomap produces is aligned. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index d0bd9d5f596c..cecc5428fd7c 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -709,11 +709,20 @@ xfs_file_dio_write( struct kiocb *iocb, struct iov_iter *from) { - struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); + struct inode *inode = file_inode(iocb->ki_filp); + struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; struct xfs_buftarg *target = xfs_inode_buftarg(ip); size_t count = iov_iter_count(from); + if (iocb->ki_flags & IOCB_ATOMIC) { + if (!generic_atomic_write_valid(iocb->ki_pos, from, + i_blocksize(inode), + XFS_FSB_TO_B(mp, xfs_get_extsz(ip)))) { + return -EINVAL; + } + } + /* direct I/O must be aligned to device logical sector size */ if ((iocb->ki_pos | count) & target->bt_logical_sectormask) return -EINVAL; From patchwork Mon Mar 4 13:04:28 2024 Content-Type: text/plain; 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We check for direct I/O and also check that the bdev can actually support atomic writes. We rely on the block layer to reject atomic writes which exceed the bdev request_queue limits, so don't bother checking any such thing here. Signed-off-by: John Garry --- fs/xfs/xfs_file.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index cecc5428fd7c..e63851be6c15 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1234,6 +1234,25 @@ xfs_file_remap_range( return remapped > 0 ? remapped : ret; } +static bool xfs_file_open_can_atomicwrite( + struct inode *inode, + struct file *file) +{ + struct xfs_inode *ip = XFS_I(inode); + struct xfs_buftarg *target = xfs_inode_buftarg(ip); + + if (!(file->f_flags & O_DIRECT)) + return false; + + if (!xfs_inode_atomicwrites(ip)) + return false; + + if (!bdev_can_atomic_write(target->bt_bdev)) + return false; + + return true; +} + STATIC int xfs_file_open( struct inode *inode, @@ -1243,6 +1262,8 @@ xfs_file_open( return -EIO; file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC | FMODE_DIO_PARALLEL_WRITE | FMODE_CAN_ODIRECT; + if (xfs_file_open_can_atomicwrite(inode, file)) + file->f_mode |= FMODE_CAN_ATOMIC_WRITE; return generic_file_open(inode, file); }