xfs: keep quota directory inode loaded

In the same vein as the previous patch, there's no point in the metapath
scrub setup function doing a lookup on the quota metadir just so it can
validate that lookups work correctly.  Instead, retain the quota
directory inode in memory for the lifetime of the mount so that we can
check this meaningfully.

Cc: <stable@vger.kernel.org> # v6.13-rc1
Fixes: 128a055291ebbc ("xfs: scrub quota file metapaths")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/scrub/metapath.c b/fs/xfs/scrub/metapath.c
index 80467d6..c678cba 100644 (file)
--- a/fs/xfs/scrub/metapath.c
+++ b/fs/xfs/scrub/metapath.c
@@ -171,23 +171,13 @@ static int
 xchk_setup_metapath_quotadir(
        struct xfs_scrub        *sc)
 {
-       struct xfs_trans        *tp;
-       struct xfs_inode        *dp = NULL;
-       int                     error;
-
-       error = xfs_trans_alloc_empty(sc->mp, &tp);
-       if (error)
-               return error;
+       struct xfs_quotainfo    *qi = sc->mp->m_quotainfo;
 
-       error = xfs_dqinode_load_parent(tp, &dp);
-       xfs_trans_cancel(tp);
-       if (error)
-               return error;
+       if (!qi || !qi->qi_dirip)
+               return -ENOENT;
 
-       error = xchk_setup_metapath_scan(sc, sc->mp->m_metadirip,
-                       kasprintf(GFP_KERNEL, "quota"), dp);
-       xfs_irele(dp);
-       return error;
+       return xchk_setup_metapath_scan(sc, sc->mp->m_metadirip,
+                       kstrdup("quota", GFP_KERNEL), qi->qi_dirip);
 }
 
 /* Scan a quota inode under the /quota directory. */
@@ -197,10 +187,7 @@ xchk_setup_metapath_dqinode(
        xfs_dqtype_t            type)
 {
        struct xfs_quotainfo    *qi = sc->mp->m_quotainfo;
-       struct xfs_trans        *tp = NULL;
-       struct xfs_inode        *dp = NULL;
        struct xfs_inode        *ip = NULL;
-       int                     error;
 
        if (!qi)
                return -ENOENT;
@@ -222,20 +209,8 @@ xchk_setup_metapath_dqinode(
        if (!ip)
                return -ENOENT;
 
-       error = xfs_trans_alloc_empty(sc->mp, &tp);
-       if (error)
-               return error;
-
-       error = xfs_dqinode_load_parent(tp, &dp);
-       xfs_trans_cancel(tp);
-       if (error)
-               return error;
-
-       error = xchk_setup_metapath_scan(sc, dp,
+       return xchk_setup_metapath_scan(sc, qi->qi_dirip,
                        kstrdup(xfs_dqinode_path(type), GFP_KERNEL), ip);
-
-       xfs_irele(dp);
-       return error;
 }
 #else
 # define xchk_setup_metapath_quotadir(...)     (-ENOENT)

diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 61ee110..3c01898 100644 (file)
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -241,6 +241,10 @@ xfs_qm_destroy_quotainos(
                xfs_irele(qi->qi_pquotaip);
                qi->qi_pquotaip = NULL;
        }
+       if (qi->qi_dirip) {
+               xfs_irele(qi->qi_dirip);
+               qi->qi_dirip = NULL;
+       }
 }
 
 /*
@@ -646,8 +650,7 @@ xfs_qm_init_timelimits(
 static int
 xfs_qm_load_metadir_qinos(
        struct xfs_mount        *mp,
-       struct xfs_quotainfo    *qi,
-       struct xfs_inode        **dpp)
+       struct xfs_quotainfo    *qi)
 {
        struct xfs_trans        *tp;
        int                     error;
@@ -656,7 +659,7 @@ xfs_qm_load_metadir_qinos(
        if (error)
                return error;
 
-       error = xfs_dqinode_load_parent(tp, dpp);
+       error = xfs_dqinode_load_parent(tp, &qi->qi_dirip);
        if (error == -ENOENT) {
                /* no quota dir directory, but we'll create one later */
                error = 0;
@@ -666,21 +669,21 @@ xfs_qm_load_metadir_qinos(
                goto out_trans;
 
        if (XFS_IS_UQUOTA_ON(mp)) {
-               error = xfs_dqinode_load(tp, *dpp, XFS_DQTYPE_USER,
+               error = xfs_dqinode_load(tp, qi->qi_dirip, XFS_DQTYPE_USER,
                                &qi->qi_uquotaip);
                if (error && error != -ENOENT)
                        goto out_trans;
        }
 
        if (XFS_IS_GQUOTA_ON(mp)) {
-               error = xfs_dqinode_load(tp, *dpp, XFS_DQTYPE_GROUP,
+               error = xfs_dqinode_load(tp, qi->qi_dirip, XFS_DQTYPE_GROUP,
                                &qi->qi_gquotaip);
                if (error && error != -ENOENT)
                        goto out_trans;
        }
 
        if (XFS_IS_PQUOTA_ON(mp)) {
-               error = xfs_dqinode_load(tp, *dpp, XFS_DQTYPE_PROJ,
+               error = xfs_dqinode_load(tp, qi->qi_dirip, XFS_DQTYPE_PROJ,
                                &qi->qi_pquotaip);
                if (error && error != -ENOENT)
                        goto out_trans;
@@ -696,34 +699,33 @@ out_trans:
 STATIC int
 xfs_qm_create_metadir_qinos(
        struct xfs_mount        *mp,
-       struct xfs_quotainfo    *qi,
-       struct xfs_inode        **dpp)
+       struct xfs_quotainfo    *qi)
 {
        int                     error;
 
-       if (!*dpp) {
-               error = xfs_dqinode_mkdir_parent(mp, dpp);
+       if (!qi->qi_dirip) {
+               error = xfs_dqinode_mkdir_parent(mp, &qi->qi_dirip);
                if (error && error != -EEXIST)
                        return error;
        }
 
        if (XFS_IS_UQUOTA_ON(mp) && !qi->qi_uquotaip) {
-               error = xfs_dqinode_metadir_create(*dpp, XFS_DQTYPE_USER,
-                               &qi->qi_uquotaip);
+               error = xfs_dqinode_metadir_create(qi->qi_dirip,
+                               XFS_DQTYPE_USER, &qi->qi_uquotaip);
                if (error)
                        return error;
        }
 
        if (XFS_IS_GQUOTA_ON(mp) && !qi->qi_gquotaip) {
-               error = xfs_dqinode_metadir_create(*dpp, XFS_DQTYPE_GROUP,
-                               &qi->qi_gquotaip);
+               error = xfs_dqinode_metadir_create(qi->qi_dirip,
+                               XFS_DQTYPE_GROUP, &qi->qi_gquotaip);
                if (error)
                        return error;
        }
 
        if (XFS_IS_PQUOTA_ON(mp) && !qi->qi_pquotaip) {
-               error = xfs_dqinode_metadir_create(*dpp, XFS_DQTYPE_PROJ,
-                               &qi->qi_pquotaip);
+               error = xfs_dqinode_metadir_create(qi->qi_dirip,
+                               XFS_DQTYPE_PROJ, &qi->qi_pquotaip);
                if (error)
                        return error;
        }
@@ -768,7 +770,6 @@ xfs_qm_init_metadir_qinos(
        struct xfs_mount        *mp)
 {
        struct xfs_quotainfo    *qi = mp->m_quotainfo;
-       struct xfs_inode        *dp = NULL;
        int                     error;
 
        if (!xfs_has_quota(mp)) {
@@ -777,20 +778,22 @@ xfs_qm_init_metadir_qinos(
                        return error;
        }
 
-       error = xfs_qm_load_metadir_qinos(mp, qi, &dp);
+       error = xfs_qm_load_metadir_qinos(mp, qi);
        if (error)
                goto out_err;
 
-       error = xfs_qm_create_metadir_qinos(mp, qi, &dp);
+       error = xfs_qm_create_metadir_qinos(mp, qi);
        if (error)
                goto out_err;
 
-       xfs_irele(dp);
+       /* The only user of the quota dir inode is online fsck */
+#if !IS_ENABLED(CONFIG_XFS_ONLINE_SCRUB)
+       xfs_irele(qi->qi_dirip);
+       qi->qi_dirip = NULL;
+#endif
        return 0;
 out_err:
        xfs_qm_destroy_quotainos(mp->m_quotainfo);
-       if (dp)
-               xfs_irele(dp);
        return error;
 }
 

diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index e919c7f..35b64bc 100644 (file)
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -55,6 +55,7 @@ struct xfs_quotainfo {
        struct xfs_inode        *qi_uquotaip;   /* user quota inode */
        struct xfs_inode        *qi_gquotaip;   /* group quota inode */
        struct xfs_inode        *qi_pquotaip;   /* project quota inode */
+       struct xfs_inode        *qi_dirip;      /* quota metadir */
        struct list_lru         qi_lru;
        int                     qi_dquots;
        struct mutex            qi_quotaofflock;/* to serialize quotaoff */