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[PATCH] xfs: Start using pquotaino from the superblock.

To: XFS mailing list <xfs@xxxxxxxxxxx>
Subject: [PATCH] xfs: Start using pquotaino from the superblock.
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Date: Fri, 19 Jul 2013 17:36:02 -0500
Delivered-to: xfs@xxxxxxxxxxx
Organization: IBM
Reply-to: sekharan@xxxxxxxxxx
Change from the previous version:
Addressed Ben's comments
 - removed unnecessary sb_gquotino == NULLFSINO check in
   xfs_sb_quota_to_disk()
 - Changed the fs_quota_stat logic to not fail with EINVAL if
   both gquota and pquota are available. Instead, fill fs_quota_stat
   only with gquota information.
----

Start using pquotino and define a macro to check if the
superblock has pquotino.

Keep backward compatibilty by alowing mount of older superblock
with no separate pquota inode.

Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
 fs/xfs/xfs_mount.c       |   62 ++++++++++++++++++++++++++++++++++-----
 fs/xfs/xfs_qm.c          |   72 ++++++++++++++++++++++++++++++++++-----------
 fs/xfs/xfs_qm_syscalls.c |   35 +++++++++++++++++++---
 fs/xfs/xfs_sb.h          |   13 ++++++--
 fs/xfs/xfs_super.c       |   19 ++++++------
 6 files changed, 159 insertions(+), 44 deletions(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 7263e1b..a0fa802 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -336,14 +336,6 @@ xfs_mount_validate_sb(
                return XFS_ERROR(EWRONGFS);
        }
 
-       if ((sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) &&
-                       (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
-                               XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))) {
-               xfs_notice(mp,
-"Super block has XFS_OQUOTA bits along with XFS_PQUOTA and/or XFS_GQUOTA 
bits.\n");
-               return XFS_ERROR(EFSCORRUPTED);
-       }
-
        /*
         * Version 5 superblock feature mask validation. Reject combinations the
         * kernel cannot support up front before checking anything else. For
@@ -387,6 +379,19 @@ xfs_mount_validate_sb(
                }
        }
 
+       if (xfs_sb_version_has_pquotino(sbp)) {
+               if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
+                       xfs_notice(mp,
+                          "Version 5 of Super block has XFS_OQUOTA bits.\n");
+                       return XFS_ERROR(EFSCORRUPTED);
+               }
+       } else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
+                               XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
+                       xfs_notice(mp,
+"Superblock earlier than Version 5 has XFS_[PQ]UOTA_{ENFD|CHKD} bits.\n");
+                       return XFS_ERROR(EFSCORRUPTED);
+       }
+
        if (unlikely(
            sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
                xfs_warn(mp,
@@ -590,6 +595,13 @@ xfs_sb_quota_from_disk(struct xfs_sb *sbp)
        if (sbp->sb_pquotino == 0)
                sbp->sb_pquotino = NULLFSINO;
 
+       /*
+        * We need to do these manipilations only if we are working
+        * with an older version of on-disk superblock.
+        */
+       if (xfs_sb_version_has_pquotino(sbp))
+               return;
+
        if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
                sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
                                        XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
@@ -597,6 +609,18 @@ xfs_sb_quota_from_disk(struct xfs_sb *sbp)
                sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
                                        XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
        sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
+
+       if (sbp->sb_qflags & XFS_PQUOTA_ACCT)  {
+               /*
+                * In older version of superblock, on-disk superblock only
+                * has sb_gquotino, and in-core superblock has both sb_gquotino
+                * and sb_pquotino. But, only one of them is supported at any
+                * point of time. So, if PQUOTA is set in disk superblock,
+                * copy over sb_gquotino to sb_pquotino.
+                */
+               sbp->sb_pquotino = sbp->sb_gquotino;
+               sbp->sb_gquotino = NULLFSINO;
+       }
 }
 
 void
@@ -668,6 +692,13 @@ xfs_sb_quota_to_disk(
 {
        __uint16_t      qflags = from->sb_qflags;
 
+       /*
+        * We need to do these manipilations only if we are working
+        * with an older version of on-disk superblock.
+        */
+       if (xfs_sb_version_has_pquotino(from))
+               return;
+
        if (*fields & XFS_SB_QFLAGS) {
                /*
                 * The in-core version of sb_qflags do not have
@@ -687,6 +718,21 @@ xfs_sb_quota_to_disk(
                to->sb_qflags = cpu_to_be16(qflags);
                *fields &= ~XFS_SB_QFLAGS;
        }
+
+       /*
+        * GQUOTINO and PQUOTINO cannot be used together in versions
+        * of superblock that do not have pquotino. from->sb_flags
+        * tells us which quota is active and should be copied to
+        * disk.
+        */
+       if ((*fields & XFS_SB_GQUOTINO) &&
+                               (from->sb_qflags & XFS_GQUOTA_ACCT))
+               to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
+       else if ((*fields & XFS_SB_PQUOTINO) &&
+                               (from->sb_qflags & XFS_PQUOTA_ACCT))
+               to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
+
+       *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO);
 }
 
 /*
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index d320794..1e2361d 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -834,6 +834,36 @@ xfs_qm_qino_alloc(
        int             error;
        int             committed;
 
+       *ip = NULL;
+       /*
+        * With superblock that doesn't have separate pquotino, we
+        * share an inode between gquota and pquota. If the on-disk
+        * superblock has GQUOTA and the filesystem is now mounted
+        * with PQUOTA, just use sb_gquotino for sb_pquotino and
+        * vice-versa.
+        */
+       if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
+                       (flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
+               xfs_ino_t ino = NULLFSINO;
+
+               if ((flags & XFS_QMOPT_PQUOTA) &&
+                            (mp->m_sb.sb_gquotino != NULLFSINO)) {
+                       ino = mp->m_sb.sb_gquotino;
+                       ASSERT(mp->m_sb.sb_pquotino == NULLFSINO);
+               } else if ((flags & XFS_QMOPT_GQUOTA) &&
+                            (mp->m_sb.sb_pquotino != NULLFSINO)) {
+                       ino = mp->m_sb.sb_pquotino;
+                       ASSERT(mp->m_sb.sb_gquotino == NULLFSINO);
+               }
+               if (ino != NULLFSINO) {
+                       error = xfs_iget(mp, NULL, ino, 0, 0, ip);
+                       if (error)
+                               return error;
+                       mp->m_sb.sb_gquotino = NULLFSINO;
+                       mp->m_sb.sb_pquotino = NULLFSINO;
+               }
+       }
+
        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
        if ((error = xfs_trans_reserve(tp,
                                      XFS_QM_QINOCREATE_SPACE_RES(mp),
@@ -844,11 +874,14 @@ xfs_qm_qino_alloc(
                return error;
        }
 
-       error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
-       if (error) {
-               xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
-                                XFS_TRANS_ABORT);
-               return error;
+       if (!*ip) {
+               error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip,
+                                                               &committed);
+               if (error) {
+                       xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
+                                        XFS_TRANS_ABORT);
+                       return error;
+               }
        }
 
        /*
@@ -860,21 +893,25 @@ xfs_qm_qino_alloc(
        if (flags & XFS_QMOPT_SBVERSION) {
                ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
                ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                                  XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
-                      (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                       XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
+                       XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
+                               (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
+                                XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
+                                XFS_SB_QFLAGS));
 
                xfs_sb_version_addquota(&mp->m_sb);
                mp->m_sb.sb_uquotino = NULLFSINO;
                mp->m_sb.sb_gquotino = NULLFSINO;
+               mp->m_sb.sb_pquotino = NULLFSINO;
 
-               /* qflags will get updated _after_ quotacheck */
-               mp->m_sb.sb_qflags = 0;
+               /* qflags will get updated fully _after_ quotacheck */
+               mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
        }
        if (flags & XFS_QMOPT_UQUOTA)
                mp->m_sb.sb_uquotino = (*ip)->i_ino;
-       else
+       else if (flags & XFS_QMOPT_GQUOTA)
                mp->m_sb.sb_gquotino = (*ip)->i_ino;
+       else
+               mp->m_sb.sb_pquotino = (*ip)->i_ino;
        spin_unlock(&mp->m_sb_lock);
        xfs_mod_sb(tp, sbfields);
 
@@ -1484,11 +1521,10 @@ xfs_qm_init_quotainos(
                        if (error)
                                goto error_rele;
                }
-               /* XXX: Use gquotino for now */
                if (XFS_IS_PQUOTA_ON(mp) &&
-                   mp->m_sb.sb_gquotino != NULLFSINO) {
-                       ASSERT(mp->m_sb.sb_gquotino > 0);
-                       error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
+                   mp->m_sb.sb_pquotino != NULLFSINO) {
+                       ASSERT(mp->m_sb.sb_pquotino > 0);
+                       error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
                                             0, 0, &pip);
                        if (error)
                                goto error_rele;
@@ -1496,7 +1532,8 @@ xfs_qm_init_quotainos(
        } else {
                flags |= XFS_QMOPT_SBVERSION;
                sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                           XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
+                           XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
+                           XFS_SB_QFLAGS);
        }
 
        /*
@@ -1524,9 +1561,8 @@ xfs_qm_init_quotainos(
                flags &= ~XFS_QMOPT_SBVERSION;
        }
        if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
-               /* XXX: Use XFS_SB_GQUOTINO for now */
                error = xfs_qm_qino_alloc(mp, &pip,
-                                         sbflags | XFS_SB_GQUOTINO,
+                                         sbflags | XFS_SB_PQUOTINO,
                                          flags | XFS_QMOPT_PQUOTA);
                if (error)
                        goto error_rele;
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index e4f8b2d..8d9e4c7 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -296,8 +296,10 @@ xfs_qm_scall_trunc_qfiles(
 
        if (flags & XFS_DQ_USER)
                error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
-       if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
+       if (flags & XFS_DQ_GROUP)
                error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
+       if (flags & XFS_DQ_PROJ)
+               error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
 
        return error ? error : error2;
 }
@@ -413,8 +415,10 @@ xfs_qm_scall_getqstat(
        struct xfs_quotainfo    *q = mp->m_quotainfo;
        struct xfs_inode        *uip = NULL;
        struct xfs_inode        *gip = NULL;
+       struct xfs_inode        *pip = NULL;
        bool                    tempuqip = false;
        bool                    tempgqip = false;
+       bool                    temppqip = false;
 
        memset(out, 0, sizeof(fs_quota_stat_t));
 
@@ -424,16 +428,14 @@ xfs_qm_scall_getqstat(
                out->qs_gquota.qfs_ino = NULLFSINO;
                return (0);
        }
+
        out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
                                                        (XFS_ALL_QUOTA_ACCT|
                                                         XFS_ALL_QUOTA_ENFD));
-       out->qs_pad = 0;
-       out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
-       out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
-
        if (q) {
                uip = q->qi_uquotaip;
                gip = q->qi_gquotaip;
+               pip = q->qi_pquotaip;
        }
        if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
                if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
@@ -445,18 +447,41 @@ xfs_qm_scall_getqstat(
                                        0, 0, &gip) == 0)
                        tempgqip = true;
        }
+       /*
+        * Q_XGETQSTAT doesn't have room for both group and project quotas.
+        * So, allow the project quota values to be copied out only if
+        * there is no group quota information available.
+        */
+       if (!gip) {
+               if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
+                       if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
+                                               0, 0, &pip) == 0)
+                               temppqip = true;
+               }
+       } else
+               pip = NULL;
        if (uip) {
+               out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
                out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
                out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
                if (tempuqip)
                        IRELE(uip);
        }
+
        if (gip) {
+               out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
                out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
                out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
                if (tempgqip)
                        IRELE(gip);
        }
+       if (pip) {
+               out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
+               out->qs_gquota.qfs_nblks = pip->i_d.di_nblocks;
+               out->qs_gquota.qfs_nextents = pip->i_d.di_nextents;
+               if (temppqip)
+                       IRELE(pip);
+       }
        if (q) {
                out->qs_incoredqs = q->qi_dquots;
                out->qs_btimelimit = q->qi_btimelimit;
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index 78f9e70..a6ff9d6 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -618,16 +618,23 @@ xfs_sb_has_incompat_log_feature(
        return (sbp->sb_features_log_incompat & feature) != 0;
 }
 
-static inline bool
-xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
+static inline int xfs_sb_version_has_pquotino(xfs_sb_t *sbp)
 {
-       return (ino == sbp->sb_uquotino || ino == sbp->sb_gquotino);
+       return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 }
 
 /*
  * end of superblock version macros
  */
 
+static inline bool
+xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
+{
+       return (ino == sbp->sb_uquotino ||
+               ino == sbp->sb_gquotino ||
+               ino == sbp->sb_pquotino);
+}
+
 #define XFS_SB_DADDR           ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 #define        XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 #define XFS_BUF_TO_SBP(bp)     ((xfs_dsb_t *)((bp)->b_addr))
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 1d68ffc..525524e 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -421,12 +421,6 @@ xfs_parseargs(
        }
 #endif
 
-       if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
-           (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
-               xfs_warn(mp, "cannot mount with both project and group quota");
-               return EINVAL;
-       }
-
        if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
                xfs_warn(mp, "sunit and swidth must be specified together");
                return EINVAL;
@@ -556,14 +550,13 @@ xfs_showargs(
        else if (mp->m_qflags & XFS_UQUOTA_ACCT)
                seq_puts(m, "," MNTOPT_UQUOTANOENF);
 
-       /* Either project or group quotas can be active, not both */
-
        if (mp->m_qflags & XFS_PQUOTA_ACCT) {
                if (mp->m_qflags & XFS_PQUOTA_ENFD)
                        seq_puts(m, "," MNTOPT_PRJQUOTA);
                else
                        seq_puts(m, "," MNTOPT_PQUOTANOENF);
-       } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
+       }
+       if (mp->m_qflags & XFS_GQUOTA_ACCT) {
                if (mp->m_qflags & XFS_GQUOTA_ENFD)
                        seq_puts(m, "," MNTOPT_GRPQUOTA);
                else
@@ -1396,6 +1389,14 @@ xfs_finish_flags(
                return XFS_ERROR(EROFS);
        }
 
+       if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
+           (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
+           !xfs_sb_version_has_pquotino(&mp->m_sb)) {
+               xfs_warn(mp,
+                 "Super block does not support project and group quota 
together");
+               return XFS_ERROR(EINVAL);
+       }
+
        return 0;
 }
 
-- 
1.7.1



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