SQLlite and QFA overhaul.

[dump.git] / common / slave.h

diff --git a/common/slave.h b/common/slave.h
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+++ b/common/slave.h
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+
+/*
+ * Structures pulled from dump/tape.c. We need it here so the 'archive' code can
+ * determine where we are in the tape.
+ */
+#ifndef _SLAVE_H
+#define _SLAVE_H 1
+
+/*
+ * Concurrent dump mods (Caltech) - disk block reading and tape writing
+ * are exported to several slave processes.  While one slave writes the
+ * tape, the others read disk blocks; they pass control of the tape in
+ * a ring via signals. The parent process traverses the filesystem and
+ * sends writeheader()'s and lists of daddr's to the slaves via pipes.
+ * The following structure defines the instruction packets sent to slaves.
+ */
+struct req {
+       ext2_loff_t dblk;
+       int count;
+};
+
+#define SLAVES 3               /* 1 slave writing, 1 reading, 1 for slack */
+
+struct slave {
+       int tapea;              /* header number at start of this chunk */
+       int count;              /* count to next header (used for TS_TAPE */
+                               /* after EOT) */
+       int inode;              /* inode that we are currently dealing with */
+       int fd;                 /* FD for this slave */
+       int pid;                /* PID for this slave */
+       int sent;               /* 1 == we've sent this slave requests */
+       int firstrec;           /* record number of this block */
+       char (*tblock)[TP_BSIZE]; /* buffer for data blocks */
+       struct req *req;        /* buffer for requests */
+};
+
+extern struct slave *slp;
+
+#endif