94 lines
2.7 KiB
Diff
94 lines
2.7 KiB
Diff
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From bde44c1e4808c8b3d7291d2ad22536d4b5d7e2f5 Mon Sep 17 00:00:00 2001
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From: Chris Mason <chris.mason@oracle.com>
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Date: Tue, 21 Feb 2012 15:56:10 -0500
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Subject: [PATCH 17/18] Scan /dev/md and device mapper devices last
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When we're using multipath or raid0, it is possible
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that btrfs dev scan will find one of the component devices
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instead of the proper virtual device the kernel creates.
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We want to make sure the kernel scans the virtual devices last,
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since it always remembers the last device it finds with a given fsid.
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Signed-off-by: Chris Mason <chris.mason@oracle.com>
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---
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utils.c | 25 ++++++++++++++++++++++++-
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volumes.c | 9 ++++++++-
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2 files changed, 32 insertions(+), 2 deletions(-)
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diff --git a/utils.c b/utils.c
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index 2d82342..0beaf80 100644
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--- a/utils.c
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+++ b/utils.c
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@@ -1156,7 +1156,10 @@ int btrfs_scan_block_devices(int run_ioctl)
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int i;
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char buf[1024];
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char fullpath[110];
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+ int scans = 0;
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+ int special;
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+scan_again:
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proc_partitions = fopen("/proc/partitions","r");
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if (!proc_partitions) {
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fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
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@@ -1172,8 +1175,23 @@ int btrfs_scan_block_devices(int run_ioctl)
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strcpy(fullpath,"/dev/");
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while(fgets(buf, 1023, proc_partitions)) {
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-
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i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
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+
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+ /*
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+ * multipath and MD devices may register as a btrfs filesystem
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+ * both through the original block device and through
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+ * the special (/dev/mapper or /dev/mdX) entry.
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+ * This scans the special entries last
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+ */
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+ special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
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+ if (!special)
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+ special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
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+
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+ if (scans == 0 && special)
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+ continue;
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+ if (scans > 0 && !special)
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+ continue;
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+
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ret = lstat(fullpath, &st);
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if (ret < 0) {
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fprintf(stderr, "failed to stat %s\n", fullpath);
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@@ -1198,6 +1216,11 @@ int btrfs_scan_block_devices(int run_ioctl)
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}
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fclose(proc_partitions);
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+
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+ if (scans == 0) {
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+ scans++;
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+ goto scan_again;
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+ }
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return 0;
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}
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diff --git a/volumes.c b/volumes.c
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index 74c88de..e7f4c3e 100644
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--- a/volumes.c
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+++ b/volumes.c
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@@ -130,7 +130,14 @@ static int device_list_add(const char *path,
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btrfs_stack_device_bytes_used(&disk_super->dev_item);
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list_add(&device->dev_list, &fs_devices->devices);
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device->fs_devices = fs_devices;
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- }
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+ } else if (!device->name || strcmp(device->name, path)) {
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+ char *name = strdup(path);
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+ if (!name)
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+ return -ENOMEM;
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+ kfree(device->name);
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+ device->name = name;
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+ }
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+
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if (found_transid > fs_devices->latest_trans) {
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fs_devices->latest_devid = devid;
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--
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1.7.6.233.gd79bc
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