[PATCH V2 03/12] xfs: Introduce xfs_iext_max() helper

From: Chandan Babu R <chandanrlinux@gmail.com>
To: linux-xfs@vger.kernel.org
Cc: Chandan Babu R <chandanrlinux@gmail.com>, djwong@kernel.org
Subject: [PATCH V2 03/12] xfs: Introduce xfs_iext_max() helper
Date: Mon, 26 Jul 2021 17:15:32 +0530	[thread overview]
Message-ID: <20210726114541.24898-4-chandanrlinux@gmail.com> (raw)
In-Reply-To: <20210726114541.24898-1-chandanrlinux@gmail.com>

xfs_iext_max() returns the maximum number of extents possible for one of
data, cow or attribute fork. This helper will be extended further in a
future commit when maximum extent counts associated with data/attribute
forks are increased.

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 fs/xfs/libxfs/xfs_bmap.c       | 9 ++++-----
 fs/xfs/libxfs/xfs_inode_buf.c  | 8 +++-----
 fs/xfs/libxfs/xfs_inode_fork.c | 6 +++---
 fs/xfs/libxfs/xfs_inode_fork.h | 8 ++++++++
 fs/xfs/scrub/inode_repair.c    | 2 +-
 5 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 8f262405a5b5..282aeb3c0e49 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -75,13 +75,12 @@ xfs_bmap_compute_maxlevels(
 	 * ATTR2 we have to assume the worst case scenario of a minimum size
 	 * available.
 	 */
-	if (whichfork == XFS_DATA_FORK) {
-		maxleafents = XFS_IFORK_EXTCNT_MAXS32;
+	maxleafents = xfs_iext_max(mp, whichfork);
+	if (whichfork == XFS_DATA_FORK)
 		sz = xfs_bmdr_space_calc(MINDBTPTRS);
-	} else {
-		maxleafents = XFS_IFORK_EXTCNT_MAXS16;
+	else
 		sz = xfs_bmdr_space_calc(MINABTPTRS);
-	}
+
 	maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
 	minleafrecs = mp->m_bmap_dmnr[0];
 	minnoderecs = mp->m_bmap_dmnr[1];
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 66d13e8fa420..419b92dc6ac8 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -343,6 +343,7 @@ xfs_dinode_verify_fork(
 	int			whichfork)
 {
 	uint32_t		di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
+	xfs_extnum_t		max_extents;
 
 	switch (XFS_DFORK_FORMAT(dip, whichfork)) {
 	case XFS_DINODE_FMT_LOCAL:
@@ -364,12 +365,9 @@ xfs_dinode_verify_fork(
 			return __this_address;
 		break;
 	case XFS_DINODE_FMT_BTREE:
-		if (whichfork == XFS_ATTR_FORK) {
-			if (di_nextents > XFS_IFORK_EXTCNT_MAXS16)
-				return __this_address;
-		} else if (di_nextents > XFS_IFORK_EXTCNT_MAXS32) {
+		max_extents = xfs_iext_max(mp, whichfork);
+		if (di_nextents > max_extents)
 			return __this_address;
-		}
 		break;
 	default:
 		return __this_address;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index 6f4b14d3d381..c6856ec95335 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -729,6 +729,7 @@ xfs_iext_count_may_overflow(
 	int			whichfork,
 	int			nr_to_add)
 {
+	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_ifork	*ifp = XFS_IFORK_PTR(ip, whichfork);
 	uint64_t		max_exts;
 	uint64_t		nr_exts;
@@ -736,10 +737,9 @@ xfs_iext_count_may_overflow(
 	if (whichfork == XFS_COW_FORK)
 		return 0;
 
-	max_exts = (whichfork == XFS_ATTR_FORK) ?
-		XFS_IFORK_EXTCNT_MAXS16 : XFS_IFORK_EXTCNT_MAXS32;
+	max_exts = xfs_iext_max(mp, whichfork);
 
-	if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
+	if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
 		max_exts = 10;
 
 	nr_exts = ifp->if_nextents + nr_to_add;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index cf82be263b48..1eda2163603e 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -133,6 +133,14 @@ static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
 	return ifp->if_format;
 }
 
+static inline xfs_extnum_t xfs_iext_max(struct xfs_mount *mp, int whichfork)
+{
+	if (whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK)
+		return XFS_IFORK_EXTCNT_MAXS32;
+	else
+		return XFS_IFORK_EXTCNT_MAXS16;
+}
+
 struct xfs_ifork *xfs_ifork_alloc(enum xfs_dinode_fmt format,
 				xfs_extnum_t nextents);
 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
index c44f8d06939b..a44d7b48c374 100644
--- a/fs/xfs/scrub/inode_repair.c
+++ b/fs/xfs/scrub/inode_repair.c
@@ -1198,7 +1198,7 @@ xrep_inode_blockcounts(
 			return error;
 		if (count >= sc->mp->m_sb.sb_dblocks)
 			return -EFSCORRUPTED;
-		if (nextents >= XFS_IFORK_EXTCNT_MAXS16)
+		if (nextents >= xfs_iext_max(sc->mp, XFS_ATTR_FORK))
 			return -EFSCORRUPTED;
 		ifp->if_nextents = nextents;
 	} else {
-- 
2.30.2

