[PATCH] JFS: Support page sizes greater than 4K

jfs has never worked on architecutures where the page size was not 4K.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 40 insertions, 49 deletions

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 98e16d93e146..bbc9c1407b55 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -227,6 +227,7 @@ static lid_t txLockAlloc(void)
 
 static void txLockFree(lid_t lid)
 {
+        TxLock[lid].tid = 0;
         TxLock[lid].next = TxAnchor.freelock;
         TxAnchor.freelock = lid;
         TxAnchor.tlocksInUse--;
@@ -633,8 +634,10 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 
         /* is page locked by the requester transaction ? */
         tlck = lid_to_tlock(lid);
-        if ((xtid = tlck->tid) == tid)
+        if ((xtid = tlck->tid) == tid) {
+                TXN_UNLOCK();
                 goto grantLock;
+        }
 
         /*
          * is page locked by anonymous transaction/lock ?
@@ -649,6 +652,7 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
          */
         if (xtid == 0) {
                 tlck->tid = tid;
+                TXN_UNLOCK();
                 tblk = tid_to_tblock(tid);
                 /*
                  * The order of the tlocks in the transaction is important
@@ -706,17 +710,18 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
          */
         tlck->tid = tid;
 
+        TXN_UNLOCK();
+
         /* mark tlock for meta-data page */
         if (mp->xflag & COMMIT_PAGE) {
 
                 tlck->flag = tlckPAGELOCK;
 
                 /* mark the page dirty and nohomeok */
-                mark_metapage_dirty(mp);
-                atomic_inc(&mp->nohomeok);
+                metapage_nohomeok(mp);
 
                 jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
-                         mp, atomic_read(&mp->nohomeok), tid, tlck);
+                         mp, mp->nohomeok, tid, tlck);
 
                 /* if anonymous transaction, and buffer is on the group
                  * commit synclist, mark inode to show this.  This will
@@ -762,8 +767,10 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
                 if (tlck->next == 0) {
                         /* This inode's first anonymous transaction */
                         jfs_ip->atltail = lid;
+                        TXN_LOCK();
                         list_add_tail(&jfs_ip->anon_inode_list,
                                       &TxAnchor.anon_list);
+                        TXN_UNLOCK();
                 }
         }
 
@@ -821,8 +828,6 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
       grantLock:
         tlck->type |= type;
 
-        TXN_UNLOCK();
-
         return tlck;
 
         /*
@@ -841,11 +846,19 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
                 BUG();
         }
         INCREMENT(stattx.waitlock);     /* statistics */
+        TXN_UNLOCK();
         release_metapage(mp);
+        TXN_LOCK();
+        xtid = tlck->tid;       /* reaquire after dropping TXN_LOCK */
 
         jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
                  tid, xtid, lid);
-        TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
+
+        /* Recheck everything since dropping TXN_LOCK */
+        if (xtid && (tlck->mp == mp) && (mp->lid == lid))
+                TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
+        else
+                TXN_UNLOCK();
         jfs_info("txLock: awakened     tid = %d, lid = %d", tid, lid);
 
         return NULL;
@@ -906,6 +919,7 @@ static void txUnlock(struct tblock * tblk)
         struct metapage *mp;
         struct jfs_log *log;
         int difft, diffp;
+        unsigned long flags;
 
         jfs_info("txUnlock: tblk = 0x%p", tblk);
         log = JFS_SBI(tblk->sb)->log;
@@ -925,19 +939,14 @@ static void txUnlock(struct tblock * tblk)
                         assert(mp->xflag & COMMIT_PAGE);
 
                         /* hold buffer
-                         *
-                         * It's possible that someone else has the metapage.
-                         * The only things were changing are nohomeok, which
-                         * is handled atomically, and clsn which is protected
-                         * by the LOGSYNC_LOCK.
                          */
-                        hold_metapage(mp, 1);
+                        hold_metapage(mp);
 
-                        assert(atomic_read(&mp->nohomeok) > 0);
-                        atomic_dec(&mp->nohomeok);
+                        assert(mp->nohomeok > 0);
+                        _metapage_homeok(mp);
 
                         /* inherit younger/larger clsn */
-                        LOGSYNC_LOCK(log);
+                        LOGSYNC_LOCK(log, flags);
                         if (mp->clsn) {
                                 logdiff(difft, tblk->clsn, log);
                                 logdiff(diffp, mp->clsn, log);
@@ -945,16 +954,11 @@ static void txUnlock(struct tblock * tblk)
                                         mp->clsn = tblk->clsn;
                         } else
                                 mp->clsn = tblk->clsn;
-                        LOGSYNC_UNLOCK(log);
+                        LOGSYNC_UNLOCK(log, flags);
 
                         assert(!(tlck->flag & tlckFREEPAGE));
 
-                        if (tlck->flag & tlckWRITEPAGE) {
-                                write_metapage(mp);
-                        } else {
-                                /* release page which has been forced */
-                                release_metapage(mp);
-                        }
+                        put_metapage(mp);
                 }
 
                 /* insert tlock, and linelock(s) of the tlock if any,
@@ -981,10 +985,10 @@ static void txUnlock(struct tblock * tblk)
          * has been inserted in logsync list at txUpdateMap())
          */
         if (tblk->lsn) {
-                LOGSYNC_LOCK(log);
+                LOGSYNC_LOCK(log, flags);
                 log->count--;
                 list_del(&tblk->synclist);
-                LOGSYNC_UNLOCK(log);
+                LOGSYNC_UNLOCK(log, flags);
         }
 }
 
@@ -1573,8 +1577,8 @@ static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                  * the last entry, so don't bother logging this
                  */
                 mp->lid = 0;
-                hold_metapage(mp, 0);
-                atomic_dec(&mp->nohomeok);
+                grab_metapage(mp);
+                metapage_homeok(mp);
                 discard_metapage(mp);
                 tlck->mp = NULL;
                 return 0;
@@ -2270,7 +2274,8 @@ void txForce(struct tblock * tblk)
                                 tlck->flag &= ~tlckWRITEPAGE;
 
                                 /* do not release page to freelist */
-
+                                force_metapage(mp);
+#if 0
                                 /*
                                  * The "right" thing to do here is to
                                  * synchronously write the metadata.
@@ -2282,9 +2287,10 @@ void txForce(struct tblock * tblk)
                                  * we can get by with synchronously writing
                                  * the pages when they are released.
                                  */
-                                assert(atomic_read(&mp->nohomeok));
+                                assert(mp->nohomeok);
                                 set_bit(META_dirty, &mp->flag);
                                 set_bit(META_sync, &mp->flag);
+#endif
                         }
                 }
         }
@@ -2344,7 +2350,7 @@ static void txUpdateMap(struct tblock * tblk)
                          */
                         mp = tlck->mp;
                         ASSERT(mp->xflag & COMMIT_PAGE);
-                        hold_metapage(mp, 0);
+                        grab_metapage(mp);
                 }
 
                 /*
@@ -2394,8 +2400,8 @@ static void txUpdateMap(struct tblock * tblk)
                                 ASSERT(mp->lid == lid);
                                 tlck->mp->lid = 0;
                         }
-                        assert(atomic_read(&mp->nohomeok) == 1);
-                        atomic_dec(&mp->nohomeok);
+                        assert(mp->nohomeok == 1);
+                        metapage_homeok(mp);
                         discard_metapage(mp);
                         tlck->mp = NULL;
                 }
@@ -2861,24 +2867,9 @@ static void LogSyncRelease(struct metapage * mp)
 {
         struct jfs_log *log = mp->log;
 
-        assert(atomic_read(&mp->nohomeok));
+        assert(mp->nohomeok);
         assert(log);
-        atomic_dec(&mp->nohomeok);
-
-        if (atomic_read(&mp->nohomeok))
-                return;
-
-        hold_metapage(mp, 0);
-
-        LOGSYNC_LOCK(log);
-        mp->log = NULL;
-        mp->lsn = 0;
-        mp->clsn = 0;
-        log->count--;
-        list_del_init(&mp->synclist);
-        LOGSYNC_UNLOCK(log);
-
-        release_metapage(mp);
+        metapage_homeok(mp);
 }
 
 /*