[PATCH v4 13/22] xfs: Unmap blocks according to forcealign

John Garry
2024-06-07T14:40:33Z

For when forcealign is enabled, blocks in an inode need to be unmapped
according to extent alignment, like what is already done for rtvol.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
fs/xfs/libxfs/xfs_bmap.c | 33 ++++++++++++++++++++++++++++-----
1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index c9cf138e13c4..2b6d5ebd8b4f 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -5380,6 +5380,20 @@ xfs_bmap_del_extent_real(
return 0;
}

+static xfs_extlen_t
+xfs_bunmapi_align(
+ struct xfs_inode *ip,
+ xfs_fsblock_t bno)
+{
+ if (xfs_inode_has_forcealign(ip)) {
+ if (is_power_of_2(ip->i_extsize))
+ return bno & (ip->i_extsize - 1);
+ return do_div(bno, ip->i_extsize);
+ }
+ ASSERT(XFS_IS_REALTIME_INODE(ip));
+ return xfs_rtb_to_rtxoff(ip->i_mount, bno);
+}
+
/*
* Unmap (remove) blocks from a file.
* If nexts is nonzero then the number of extents to remove is limited to
@@ -5402,6 +5416,7 @@ __xfs_bunmapi(
struct xfs_bmbt_irec got; /* current extent record */
struct xfs_ifork *ifp; /* inode fork pointer */
int isrt; /* freeing in rt area */
+ int isforcealign; /* freeing for inode with forcealign */
int logflags; /* transaction logging flags */
xfs_extlen_t mod; /* rt extent offset */
struct xfs_mount *mp = ip->i_mount;
@@ -5439,6 +5454,8 @@ __xfs_bunmapi(
}
XFS_STATS_INC(mp, xs_blk_unmap);
isrt = xfs_ifork_is_realtime(ip, whichfork);
+ isforcealign = (whichfork != XFS_ATTR_FORK) &&
+ xfs_inode_has_forcealign(ip);
end = start + len;

if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) {
@@ -5490,11 +5507,10 @@ __xfs_bunmapi(
if (del.br_startoff + del.br_blockcount > end + 1)
del.br_blockcount = end + 1 - del.br_startoff;

- if (!isrt || (flags & XFS_BMAPI_REMAP))
+ if ((!isrt && !isforcealign) || (flags & XFS_BMAPI_REMAP))
goto delete;

- mod = xfs_rtb_to_rtxoff(mp,
- del.br_startblock + del.br_blockcount);
+ mod = xfs_bunmapi_align(ip, del.br_startblock + del.br_blockcount);
if (mod) {
/*
* Realtime extent not lined up at the end.
@@ -5542,9 +5558,16 @@ __xfs_bunmapi(
goto nodelete;
}

- mod = xfs_rtb_to_rtxoff(mp, del.br_startblock);
+ mod = xfs_bunmapi_align(ip, del.br_startblock);
if (mod) {
- xfs_extlen_t off = mp->m_sb.sb_rextsize - mod;
+ xfs_extlen_t off;
+
+ if (isforcealign) {
+ off = ip->i_extsize - mod;
+ } else {
+ ASSERT(isrt);
+ off = mp->m_sb.sb_rextsize - mod;
+ }

/*
* Realtime extent is lined up at the end but not
--
2.31.1