From 84140a96cf7a5b5b48b862a79c8322aa220ce591 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Wed, 20 Nov 2024 16:20:18 -0800 Subject: [PATCH] xfs: prepare to reuse the dquot pointer space in struct xfs_inode Files participating in the metadata directory tree are not accounted to the quota subsystem. Therefore, the i_[ugp]dquot pointers in struct xfs_inode are never used and should always be NULL. In the next patch we want to add a u64 count of fs blocks reserved for metadata btree expansion, but we don't want every inode in the fs to pay the memory price for this feature. The intent is to union those three pointers with the u64 counter, but for that to work we must guard against all access to the dquot pointers for metadata files. Signed-off-by: "Darrick J. Wong" Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_attr.c | 4 +--- fs/xfs/libxfs/xfs_bmap.c | 4 +--- fs/xfs/scrub/tempfile.c | 1 + fs/xfs/xfs_dquot.h | 3 +++ fs/xfs/xfs_exchrange.c | 3 +++ fs/xfs/xfs_inode.h | 10 +++++++--- fs/xfs/xfs_qm.c | 2 ++ fs/xfs/xfs_quota.h | 5 ----- fs/xfs/xfs_trans.c | 4 ++++ fs/xfs/xfs_trans_dquot.c | 8 ++++---- 10 files changed, 26 insertions(+), 18 deletions(-) diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c index 17875ad865f5..8c04acd30d48 100644 --- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c @@ -1004,9 +1004,7 @@ xfs_attr_add_fork( unsigned int blks; /* space reservation */ int error; /* error return value */ - if (xfs_is_metadir_inode(ip)) - ASSERT(XFS_IS_DQDETACHED(ip)); - else + if (!xfs_is_metadir_inode(ip)) ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); blks = XFS_ADDAFORK_SPACE_RES(mp); diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 0842577755f7..02323936cc9b 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -1042,9 +1042,7 @@ xfs_bmap_add_attrfork( int error; /* error return value */ xfs_assert_ilocked(ip, XFS_ILOCK_EXCL); - if (xfs_is_metadir_inode(ip)) - ASSERT(XFS_IS_DQDETACHED(ip)); - else + if (!xfs_is_metadir_inode(ip)) ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); ASSERT(!xfs_inode_has_attr_fork(ip)); diff --git a/fs/xfs/scrub/tempfile.c b/fs/xfs/scrub/tempfile.c index 2d7ca7e1bbca..4ebb5f8459e8 100644 --- a/fs/xfs/scrub/tempfile.c +++ b/fs/xfs/scrub/tempfile.c @@ -749,6 +749,7 @@ xrep_tempexch_reserve_quota( * or the two inodes have the same dquots. */ if (!XFS_IS_QUOTA_ON(tp->t_mountp) || req->ip1 == req->ip2 || + xfs_is_metadir_inode(req->ip1) || (req->ip1->i_udquot == req->ip2->i_udquot && req->ip1->i_gdquot == req->ip2->i_gdquot && req->ip1->i_pdquot == req->ip2->i_pdquot)) diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h index c617bac75361..61217adf5ba5 100644 --- a/fs/xfs/xfs_dquot.h +++ b/fs/xfs/xfs_dquot.h @@ -160,6 +160,9 @@ static inline struct xfs_dquot *xfs_inode_dquot( struct xfs_inode *ip, xfs_dqtype_t type) { + if (xfs_is_metadir_inode(ip)) + return NULL; + switch (type) { case XFS_DQTYPE_USER: return ip->i_udquot; diff --git a/fs/xfs/xfs_exchrange.c b/fs/xfs/xfs_exchrange.c index 265c42449893..f340a2015c4c 100644 --- a/fs/xfs/xfs_exchrange.c +++ b/fs/xfs/xfs_exchrange.c @@ -119,6 +119,9 @@ xfs_exchrange_reserve_quota( int ip1_error = 0; int error; + ASSERT(!xfs_is_metadir_inode(req->ip1)); + ASSERT(!xfs_is_metadir_inode(req->ip2)); + /* * Don't bother with a quota reservation if we're not enforcing them * or the two inodes have the same dquots. diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 1648dc5a8068..1141c2e8e123 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -25,9 +25,13 @@ struct xfs_dquot; typedef struct xfs_inode { /* Inode linking and identification information. */ struct xfs_mount *i_mount; /* fs mount struct ptr */ - struct xfs_dquot *i_udquot; /* user dquot */ - struct xfs_dquot *i_gdquot; /* group dquot */ - struct xfs_dquot *i_pdquot; /* project dquot */ + union { + struct { + struct xfs_dquot *i_udquot; /* user dquot */ + struct xfs_dquot *i_gdquot; /* group dquot */ + struct xfs_dquot *i_pdquot; /* project dquot */ + }; + }; /* Inode location stuff */ xfs_ino_t i_ino; /* inode number (agno/agino)*/ diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index dc8b1010d4d3..3abab5fb593e 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -428,6 +428,8 @@ void xfs_qm_dqdetach( xfs_inode_t *ip) { + if (xfs_is_metadir_inode(ip)) + return; if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot)) return; diff --git a/fs/xfs/xfs_quota.h b/fs/xfs/xfs_quota.h index d7565462af3d..105e6eb57620 100644 --- a/fs/xfs/xfs_quota.h +++ b/fs/xfs/xfs_quota.h @@ -29,11 +29,6 @@ struct xfs_buf; (XFS_IS_GQUOTA_ON(mp) && (ip)->i_gdquot == NULL) || \ (XFS_IS_PQUOTA_ON(mp) && (ip)->i_pdquot == NULL)) -#define XFS_IS_DQDETACHED(ip) \ - ((ip)->i_udquot == NULL && \ - (ip)->i_gdquot == NULL && \ - (ip)->i_pdquot == NULL) - #define XFS_QM_NEED_QUOTACHECK(mp) \ ((XFS_IS_UQUOTA_ON(mp) && \ (mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) || \ diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 4cd25717c9d1..f53f82456288 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -1266,6 +1266,9 @@ retry: xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); + if (xfs_is_metadir_inode(ip)) + goto out; + error = xfs_qm_dqattach_locked(ip, false); if (error) { /* Caller should have allocated the dquots! */ @@ -1334,6 +1337,7 @@ retry: goto out_cancel; } +out: *tpp = tp; return 0; diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c index 713b6d243e56..765456bf3428 100644 --- a/fs/xfs/xfs_trans_dquot.c +++ b/fs/xfs/xfs_trans_dquot.c @@ -156,7 +156,8 @@ xfs_trans_mod_ino_dquot( unsigned int field, int64_t delta) { - ASSERT(!xfs_is_metadir_inode(ip) || XFS_IS_DQDETACHED(ip)); + if (xfs_is_metadir_inode(ip)) + return; xfs_trans_mod_dquot(tp, dqp, field, delta); @@ -246,11 +247,10 @@ xfs_trans_mod_dquot_byino( xfs_mount_t *mp = tp->t_mountp; if (!XFS_IS_QUOTA_ON(mp) || - xfs_is_quota_inode(&mp->m_sb, ip->i_ino)) + xfs_is_quota_inode(&mp->m_sb, ip->i_ino) || + xfs_is_metadir_inode(ip)) return; - ASSERT(!xfs_is_metadir_inode(ip) || XFS_IS_DQDETACHED(ip)); - if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot) xfs_trans_mod_ino_dquot(tp, ip, ip->i_udquot, field, delta); if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot) -- 2.25.1