mdadm (3.4-2) unstable; urgency=low

  * Reneable incremental assembly
  * Rely on udev to assemble incremental arrays
  * In environments with systemd rely on mdadm-last-resort@.timer|.service
    units to activate degrated raids
  * In environments initramfs-tools initrd (no systemd) add local-block
    script to do the same after 2/3rds of root delay iteration
  * Drop local-top initramfs script
  * Drop dependency on initscripts package
  * Drop INITRDSTART support
  * Drop mdadm-raid init script
  * Drop ancient preinst
  * In mdadm.init remove dependency on mdadm-raid
  * In mdadm.init check, and bail out running in a container
  * In mdadm.config drop mdadm/autostart logic
  * Drop CREATE stanzas from mkconf and don't include them in the
    initramfs. The generated defaults, are the compiled-in defaults. And
    the current one generates warnings when running mdadm in the
    initramfs, as there is no passwd|group files to resolve root/disk
    uid/gid. Closes: 717609
  * Adapt changes and formatting of initramfs hook from Ubuntu
  * Bump standards version to 3.9.7, no changes required
  * Fix copyright-refers-to-symlink-license
  * Closes: #781172, #796624, #769201, #813335, #632401, #804973, #714155,
    #770002, #737132, #675452, #726390, #813637, #814036.

# imported from the archive

1 files changed, 80 insertions, 0 deletions

diff --git a/raid5extend.c b/raid5extend.c
new file mode 100644
index 00000000..d8e62c2c
--- /dev/null
+++ b/raid5extend.c
@@ -0,0 +1,80 @@
+
+int phys2log(int phys, int stripe, int n, int layout)
+{
+    /* In an 'n' disk array using 'layout',
+     * in stripe 'stripe', the physical disc 'phys'
+     * stores what logical chunk?
+     * -1 mean parity.
+     *
+     */
+    switch(layout) {
+    case ALGORITHM_LEFT_ASYMMETRIC:
+	pd = (n-1) - (stripe % n);
+	if (phys < pd)
+	    return phys;
+	else if (phys == pd)
+	    return -1;
+	else return phys-1;
+
+    case ALGORITHM_RIGHT_ASYMMETRIC:
+	pd = stripe % n;
+	if (phys < pd)
+	    return phys;
+	else if (phys == pd)
+	    return -1;
+	else return phys-1;
+
+    case ALGORITHM_LEFT_SYMMETRIC:
+	pd = (n-1) - (stripe %n);
+	if (phys < pd)
+	    return phys+ n-1-pd;
+	else if (phys == pd)
+	    return -1;
+	else return phys-pd-1;
+
+    case ALGORITHM_RIGHT_SYMMETRIC:
+	pd = stripe % n;
+	if (phys < pd)
+	    return phys+ n-1-pd;
+	else if (phys == pd)
+	    return -1;
+	else return phys-pd-1;
+    }
+    return -2;
+}
+
+raid5_extend(unsigned long len, int chunksize, int layout, int n, int m, int rfds[], int wfds[])
+{
+
+    static char buf[4096];
+
+    unsigned long blocks = len/4;
+    unsigned int blocksperchunk= chunksize/4096;
+
+    unsigned long b;
+
+    for (b=0; b<blocks; b++) {
+	unsigned long stripe = b / blocksperchunk;
+	unsigned int offset = b - (stripe*blocksperchunk);
+	unsigned long chunk = stripe * (n-1);
+	int src;
+	for (src=0; src<n; src++) {
+	    int dnum, snum;
+	    if (read(rfds[src], buf, sizeof(buf)) != sizeof(buf)) {
+		error();
+		return 0;
+	    }
+
+	    snum = phys2log(src, stripe, n, layout);
+
+	    if (snum == -1)
+		continue;
+	    chunk = stripe*(n-1)+snum;
+
+	    dstripe = chunk/(m-1);
+	    dnum = log2phys(chunk-(stripe*(m-1)), dstripe, m, layout);
+	    llseek(wfds[dnum], dstripe*chunksize+(offset*4096), 0);
+	    write(wfds[dnum], buf, sizeof(buf));
+	}
+    }
+}