[PATCH v4 10/22] xfs: Introduce FORCEALIGN inode flag

From: John Garry
Date: Fri Jun 07 2024 - 10:45:04 EST

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From: "Darrick J. Wong" <djwong@xxxxxxxxxx>

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.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Co-developed-by: John Garry <john.g.garry@xxxxxxxxxx>
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_format.h | 6 +++-
fs/xfs/libxfs/xfs_inode_buf.c | 53 +++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_inode_buf.h | 3 ++
fs/xfs/libxfs/xfs_sb.c | 2 ++
fs/xfs/xfs_inode.c | 13 +++++++++
fs/xfs/xfs_inode.h | 20 ++++++++++++-
fs/xfs/xfs_ioctl.c | 47 +++++++++++++++++++++++++++++--
fs/xfs/xfs_mount.h | 2 ++
fs/xfs/xfs_reflink.h | 10 -------
fs/xfs/xfs_super.c | 4 +++
include/uapi/linux/fs.h | 2 ++
11 files changed, 148 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 61f51becff4f..b48cd75d34a6 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 | \
@@ -1094,16 +1095,19 @@ 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 e7a7bfbe75b4..b2c5f466c1a9 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -644,6 +644,15 @@ xfs_dinode_verify(
!xfs_has_bigtime(mp))
return __this_address;

+ if (flags2 & XFS_DIFLAG2_FORCEALIGN) {
+ fa = xfs_inode_validate_forcealign(mp,
+ be32_to_cpu(dip->di_extsize),
+ be32_to_cpu(dip->di_cowextsize),
+ mode, flags, flags2);
+ if (fa)
+ return fa;
+ }
+
return NULL;
}

@@ -811,3 +820,47 @@ xfs_inode_validate_cowextsize(

return NULL;
}
+
+/* Validate the forcealign inode flag */
+xfs_failaddr_t
+xfs_inode_validate_forcealign(
+ struct xfs_mount *mp,
+ uint32_t extsize,
+ uint32_t cowextsize,
+ uint16_t mode,
+ uint16_t flags,
+ uint64_t flags2)
+{
+ /* 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;
+
+ /* We require EXTSIZE or EXTSZINHERIT */
+ if (!(flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT)))
+ return __this_address;
+
+ /* We require a non-zero extsize */
+ if (!extsize)
+ return __this_address;
+
+ /* Reflink'ed disallowed */
+ if (flags2 & XFS_DIFLAG2_REFLINK)
+ return __this_address;
+
+ /* COW extsize disallowed */
+ if (flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ return __this_address;
+
+ if (cowextsize)
+ return __this_address;
+
+ /* A RT device with sb_rextsize=1 could make use of forcealign */
+ if (flags & XFS_DIFLAG_REALTIME && mp->m_sb.sb_rextsize != 1)
+ 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..b8b65287b037 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,
+ uint32_t extsize, uint32_t cowextsize, uint16_t mode,
+ uint16_t flags, uint64_t flags2);

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 09e4bf949bf8..515f5dd23b6d 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 |= 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 93ad442f399b..a6cd5f1f2680 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -608,6 +608,8 @@ 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))
@@ -737,6 +739,8 @@ 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,
@@ -745,6 +749,15 @@ 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,
+ ip->i_extsize, ip->i_cowextsize,
+ VFS_I(ip)->i_mode, ip->i_diflags,
+ ip->i_diflags2);
+ if (failaddr)
+ ip->i_diflags2 &= ~XFS_DIFLAG2_FORCEALIGN;
+ }
}

/*
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 805a8cf522c6..7005ea29bf11 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -301,6 +301,16 @@ static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip)
return ip->i_cowfp && ip->i_cowfp->if_bytes;
}

+static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
+{
+ return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
+}
+
+static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
+{
+ return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
+}
+
static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip)
{
return ip->i_diflags2 & XFS_DIFLAG2_BIGTIME;
@@ -313,7 +323,15 @@ static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip)

static inline bool xfs_inode_has_forcealign(struct xfs_inode *ip)
{
- return false;
+ if (!(ip->i_diflags & XFS_DIFLAG_EXTSIZE))
+ return false;
+ if (ip->i_extsize <= 1)
+ return false;
+ if (xfs_is_cow_inode(ip))
+ return false;
+ if (ip->i_diflags & XFS_DIFLAG_REALTIME)
+ return false;
+ return ip->i_diflags2 & XFS_DIFLAG2_FORCEALIGN;
}

/*
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index f0117188f302..5eff8fd9fa3e 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -525,10 +525,48 @@ 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;
}

+/*
+ * Forcealign requires a non-zero extent size hint and a zero cow
+ * extent size hint. Don't allow set for RT files yet.
+ */
+static int
+xfs_ioctl_setattr_forcealign(
+ struct xfs_inode *ip,
+ struct fileattr *fa)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (!xfs_has_forcealign(mp))
+ return -EINVAL;
+
+ if (xfs_is_reflink_inode(ip))
+ return -EINVAL;
+
+ if (!(fa->fsx_xflags & (FS_XFLAG_EXTSIZE |
+ FS_XFLAG_EXTSZINHERIT)))
+ return -EINVAL;
+
+ if (fa->fsx_xflags & FS_XFLAG_COWEXTSIZE)
+ return -EINVAL;
+
+ if (!fa->fsx_extsize)
+ return -EINVAL;
+
+ if (fa->fsx_cowextsize)
+ return -EINVAL;
+
+ if (fa->fsx_xflags & FS_XFLAG_REALTIME)
+ return -EINVAL;
+
+ return 0;
+}
+
static int
xfs_ioctl_setattr_xflags(
struct xfs_trans *tp,
@@ -537,10 +575,12 @@ xfs_ioctl_setattr_xflags(
{
struct xfs_mount *mp = ip->i_mount;
bool rtflag = (fa->fsx_xflags & FS_XFLAG_REALTIME);
+ bool forcealign = fa->fsx_xflags & FS_XFLAG_FORCEALIGN;
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 forcealign flags if any extents are allocated. */
+ if (rtflag != XFS_IS_REALTIME_INODE(ip) ||
+ forcealign != xfs_inode_has_forcealign(ip)) {
if (ip->i_df.if_nextents || ip->i_delayed_blks)
return -EINVAL;
}
@@ -561,6 +601,9 @@ xfs_ioctl_setattr_xflags(
if (i_flags2 && !xfs_has_v3inodes(mp))
return -EINVAL;

+ if (forcealign && (xfs_ioctl_setattr_forcealign(ip, fa) < 0))
+ 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 d0567dfbc036..30228fea908d 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -299,6 +299,7 @@ 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_FORCEALIGN (1ULL << 28) /* aligned file data extents */

/* Mount features */
#define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */
@@ -385,6 +386,7 @@ __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(forcealign, FORCEALIGN)

/*
* Mount features
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index 65c5dfe17ecf..fb55e4ce49fa 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -6,16 +6,6 @@
#ifndef __XFS_REFLINK_H
#define __XFS_REFLINK_H 1

-static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
-{
- return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
-}
-
-static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
-{
- return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
-}
-
extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
struct xfs_bmbt_irec *irec, bool *shared);
int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 27e9f749c4c7..852bbfb21506 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1721,6 +1721,10 @@ 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 191a7e88a8ab..6a6bcb53594a 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -158,6 +158,8 @@ 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
--
2.31.1

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