tdb: remove lock ops

Now the transaction code uses the standard allrecord lock, that stops
us from trying to grab any per-record locks anyway.  We don't need to
have special noop lock ops for transactions.

This is a nice simplification: if you see brlock, you know it's really
going to grab a lock.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(Imported from commit 9f295eecffd92e55584fc36539cd85cd32c832de)

diff --git a/lib/tdb/common/io.c b/lib/tdb/common/io.c
index 85f69ab0d6ec7476b9e12f181f80715177b20974..5b20fa1902a9bedaa8e3f59bc1eaffb3f33085fb 100644 (file)
--- a/lib/tdb/common/io.c
+++ b/lib/tdb/common/io.c
@@ -461,8 +461,6 @@ static const struct tdb_methods io_methods = {
        tdb_next_hash_chain,
        tdb_oob,
        tdb_expand_file,
-       tdb_brlock,
-       tdb_brunlock
 };
 
 /*

diff --git a/lib/tdb/common/lock.c b/lib/tdb/common/lock.c
index 193d1d8a0aeef437c95ab4be9cd55b80cf1ea1b6..030460c781154141e90b57e0a63708a4964d41bf 100644 (file)
--- a/lib/tdb/common/lock.c
+++ b/lib/tdb/common/lock.c
@@ -119,6 +119,12 @@ static int fcntl_unlock(struct tdb_context *tdb, int rw, off_t off, off_t len)
        return fcntl(tdb->fd, F_SETLKW, &fl);
 }
 
+/* list -1 is the alloc list, otherwise a hash chain. */
+static tdb_off_t lock_offset(int list)
+{
+       return FREELIST_TOP + 4*list;
+}
+
 /* a byte range locking function - return 0 on success
    this functions locks/unlocks 1 byte at the specified offset.
 
@@ -146,6 +152,14 @@ int tdb_brlock(struct tdb_context *tdb,
                return -1;
        }
 
+       /* Sanity check */
+       if (tdb->transaction && offset >= lock_offset(-1) && len != 0) {
+               tdb->ecode = TDB_ERR_RDONLY;
+               TDB_LOG((tdb, TDB_DEBUG_TRACE, "tdb_brlock attempted in transaction at offset %d rw_type=%d flags=%d len=%d\n",
+                        offset, rw_type, flags, (int)len));
+               return -1;
+       }
+
        do {
                ret = fcntl_lock(tdb, rw_type, offset, len,
                                 flags & TDB_LOCK_WAIT);
@@ -234,12 +248,6 @@ int tdb_allrecord_upgrade(struct tdb_context *tdb)
        return -1;
 }
 
-/* list -1 is the alloc list, otherwise a hash chain. */
-static tdb_off_t lock_offset(int list)
-{
-       return FREELIST_TOP + 4*list;
-}
-
 static struct tdb_lock_type *find_nestlock(struct tdb_context *tdb,
                                           tdb_off_t offset)
 {
@@ -289,7 +297,7 @@ int tdb_nest_lock(struct tdb_context *tdb, uint32_t offset, int ltype,
 
        /* Since fcntl locks don't nest, we do a lock for the first one,
           and simply bump the count for future ones */
-       if (tdb->methods->brlock(tdb, ltype, offset, 1, flags)) {
+       if (tdb_brlock(tdb, ltype, offset, 1, flags)) {
                return -1;
        }
 
@@ -380,7 +388,7 @@ int tdb_nest_unlock(struct tdb_context *tdb, uint32_t offset, int ltype,
        if (mark_lock) {
                ret = 0;
        } else {
-               ret = tdb->methods->brunlock(tdb, ltype, offset, 1);
+               ret = tdb_brunlock(tdb, ltype, offset, 1);
        }
 
        /*
@@ -470,7 +478,7 @@ int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
                return -1;
        }
 
-       if (tdb->methods->brlock(tdb, ltype, FREELIST_TOP, 0, flags)) {
+       if (tdb_brlock(tdb, ltype, FREELIST_TOP, 0, flags)) {
                if (flags & TDB_LOCK_WAIT) {
                        TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_lockall failed (%s)\n", strerror(errno)));
                }
@@ -514,8 +522,7 @@ int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype, bool mark_lock)
                return 0;
        }
 
-       if (!mark_lock &&
-           tdb->methods->brunlock(tdb, ltype, FREELIST_TOP, 0)) {
+       if (!mark_lock && tdb_brunlock(tdb, ltype, FREELIST_TOP, 0)) {
                TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_unlockall failed (%s)\n", strerror(errno)));
                return -1;
        }
@@ -648,7 +655,7 @@ int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off)
        if (tdb->allrecord_lock.count) {
                return 0;
        }
-       return off ? tdb->methods->brlock(tdb, F_RDLCK, off, 1, TDB_LOCK_WAIT) : 0;
+       return off ? tdb_brlock(tdb, F_RDLCK, off, 1, TDB_LOCK_WAIT) : 0;
 }
 
 /*
@@ -668,7 +675,7 @@ int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off)
                }
                return -1;
        }
-       return tdb->methods->brlock(tdb, F_WRLCK, off, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE);
+       return tdb_brlock(tdb, F_WRLCK, off, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE);
 }
 
 int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off)
@@ -676,7 +683,7 @@ int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off)
        if (tdb->allrecord_lock.count) {
                return 0;
        }
-       return tdb->methods->brunlock(tdb, F_WRLCK, off, 1);
+       return tdb_brunlock(tdb, F_WRLCK, off, 1);
 }
 
 /* fcntl locks don't stack: avoid unlocking someone else's */
@@ -694,7 +701,7 @@ int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off)
        for (i = &tdb->travlocks; i; i = i->next)
                if (i->off == off)
                        count++;
-       return (count == 1 ? tdb->methods->brunlock(tdb, F_RDLCK, off, 1) : 0);
+       return (count == 1 ? tdb_brunlock(tdb, F_RDLCK, off, 1) : 0);
 }
 
 bool tdb_have_extra_locks(struct tdb_context *tdb)

diff --git a/lib/tdb/common/tdb_private.h b/lib/tdb/common/tdb_private.h
index b031ddd324a13a1e3d8fff65e31291cc1bddf838..f086e7d90531aa602602716c6f4f7aac06430352 100644 (file)
--- a/lib/tdb/common/tdb_private.h
+++ b/lib/tdb/common/tdb_private.h
@@ -179,8 +179,6 @@ struct tdb_methods {
        void (*next_hash_chain)(struct tdb_context *, uint32_t *);
        int (*tdb_oob)(struct tdb_context *, tdb_off_t , int );
        int (*tdb_expand_file)(struct tdb_context *, tdb_off_t , tdb_off_t );
-       int (*brlock)(struct tdb_context *, int, tdb_off_t, size_t, enum tdb_lock_flags);
-       int (*brunlock)(struct tdb_context *, int, tdb_off_t, size_t);
 };
 
 struct tdb_context {

diff --git a/lib/tdb/common/transaction.c b/lib/tdb/common/transaction.c
index d24256d2fbadd196020a1b7ad83975b42f5579de..763afffc528e28b6d9533913487002e63f567c28 100644 (file)
--- a/lib/tdb/common/transaction.c
+++ b/lib/tdb/common/transaction.c
@@ -408,33 +408,12 @@ static int transaction_expand_file(struct tdb_context *tdb, tdb_off_t size,
        return 0;
 }
 
-/*
-  brlock during a transaction - ignore them
-*/
-static int transaction_brlock(struct tdb_context *tdb,
-                             int rw_type, tdb_off_t offset, size_t len,
-                             enum tdb_lock_flags flags)
-{
-       /* FIXME: We actually grab the open lock during a transaction. */
-       if (offset == OPEN_LOCK)
-               return tdb_brlock(tdb, rw_type, offset, len, flags);
-       return 0;
-}
-
-static int transaction_brunlock(struct tdb_context *tdb,
-                               int rw_type, tdb_off_t offset, size_t len)
-{
-       return 0;
-}
-
 static const struct tdb_methods transaction_methods = {
        transaction_read,
        transaction_write,
        transaction_next_hash_chain,
        transaction_oob,
        transaction_expand_file,
-       transaction_brlock,
-       transaction_brunlock
 };