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>
---
include/linux.h | 5 +++++
include/xfs_inode.h | 5 +++++
include/xfs_mount.h | 2 ++
libxfs/util.c | 2 ++
libxfs/xfs_format.h | 6 +++++-
libxfs/xfs_inode_buf.c | 40 ++++++++++++++++++++++++++++++++++++++++
libxfs/xfs_inode_buf.h | 3 +++
libxfs/xfs_sb.c | 3 +++
8 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/include/linux.h b/include/linux.h
index eddc4ad9c899..05dde8723c15 100644
--- a/include/linux.h
+++ b/include/linux.h
@@ -251,6 +251,11 @@ struct fsxattr {
#define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */
#endif
+/* data extent mappings for regular files must be aligned to extent size hint */
+#ifndef FS_XFLAG_FORCEALIGN
+#define FS_XFLAG_FORCEALIGN 0x00020000
+#endif
+
/*
* Reminder: anything added to this file will be compiled into downstream
* userspace projects!
diff --git a/include/xfs_inode.h b/include/xfs_inode.h
index 069fcf362ece..7aea79ab3af4 100644
--- a/include/xfs_inode.h
+++ b/include/xfs_inode.h
@@ -233,6 +233,11 @@ 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;
+}
+
/* Always set the child's GID to this value, even if the parent is setgid. */
#define CRED_FORCE_GID (1U << 0)
struct cred {
diff --git a/include/xfs_mount.h b/include/xfs_mount.h
index 99d1d9ab13cb..d31fe38f7c84 100644
--- a/include/xfs_mount.h
+++ b/include/xfs_mount.h
@@ -166,6 +166,7 @@ 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 */
#define __XFS_HAS_FEAT(name, NAME) \
static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
@@ -210,6 +211,7 @@ __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)
/* Kernel mount features that we don't support */
#define __XFS_UNSUPP_FEAT(name) \
diff --git a/libxfs/util.c b/libxfs/util.c
index e7d3497ec96f..58b6a85562a2 100644
--- a/libxfs/util.c
+++ b/libxfs/util.c
@@ -206,6 +206,8 @@ 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;
}
diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 371dc07233e0..d718b73f48ca 100644
--- a/libxfs/xfs_format.h
+++ b/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 | \
@@ -1069,16 +1070,19 @@ 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/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
index cbcaadbcf69c..d6ad361ea893 100644
--- a/libxfs/xfs_inode_buf.c
+++ b/libxfs/xfs_inode_buf.c
@@ -601,6 +601,14 @@ 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;
}
@@ -768,3 +776,35 @@ 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 nonzero extent size hint */
+ if (extsize == 0)
+ return __this_address;
+
+ /* Requires no cow extent size hint */
+ if (cowextsize != 0)
+ return __this_address;
+
+ return NULL;
+}
diff --git a/libxfs/xfs_inode_buf.h b/libxfs/xfs_inode_buf.h
index 585ed5a110af..50db17d22b68 100644
--- a/libxfs/xfs_inode_buf.h
+++ b/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/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index 1e71d43d0a45..0c31cd062d63 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -160,6 +160,9 @@ 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)
--
2.34.1
