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From fc6fd4063769f4194c3fb8f77b32b2819e140fb9 Mon Sep 17 00:00:00 2001
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From: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Date: Thu, 18 Aug 2022 11:47:21 +0200
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Subject: [PATCH 55/83] Manage: Block unsafe member failing
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Kernel may or may not block mdadm from removing member device if it
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will cause arrays failed state. It depends on raid personality
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implementation in kernel.
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Add verification on requested removal path (#mdadm --set-faulty
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command).
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Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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Manage.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 52 insertions(+), 1 deletion(-)
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diff --git a/Manage.c b/Manage.c
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index a142f8bd..b1d0e630 100644
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--- a/Manage.c
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+++ b/Manage.c
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@@ -1285,6 +1285,50 @@ int Manage_with(struct supertype *tst, int fd, struct mddev_dev *dv,
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return -1;
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}
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+/**
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+ * is_remove_safe() - Check if remove is safe.
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+ * @array: Array info.
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+ * @fd: Array file descriptor.
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+ * @devname: Name of device to remove.
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+ * @verbose: Verbose.
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+ *
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+ * The function determines if array will be operational
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+ * after removing &devname.
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+ *
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+ * Return: True if array will be operational, false otherwise.
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+ */
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+bool is_remove_safe(mdu_array_info_t *array, const int fd, char *devname, const int verbose)
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+{
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+ dev_t devid = devnm2devid(devname + 5);
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+ struct mdinfo *mdi = sysfs_read(fd, NULL, GET_DEVS | GET_DISKS | GET_STATE);
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+
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+ if (!mdi) {
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+ if (verbose)
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+ pr_err("Failed to read sysfs attributes for %s\n", devname);
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+ return false;
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+ }
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+
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+ char *avail = xcalloc(array->raid_disks, sizeof(char));
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+
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+ for (mdi = mdi->devs; mdi; mdi = mdi->next) {
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+ if (mdi->disk.raid_disk < 0)
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+ continue;
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+ if (!(mdi->disk.state & (1 << MD_DISK_SYNC)))
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+ continue;
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+ if (makedev(mdi->disk.major, mdi->disk.minor) == devid)
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+ continue;
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+ avail[mdi->disk.raid_disk] = 1;
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+ }
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+ sysfs_free(mdi);
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+
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+ bool is_enough = enough(array->level, array->raid_disks,
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+ array->layout, (array->state & 1),
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+ avail);
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+
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+ free(avail);
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+ return is_enough;
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+}
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+
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int Manage_subdevs(char *devname, int fd,
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struct mddev_dev *devlist, int verbose, int test,
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char *update, int force)
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@@ -1598,7 +1642,14 @@ int Manage_subdevs(char *devname, int fd,
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break;
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case 'f': /* set faulty */
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- /* FIXME check current member */
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+ if (!is_remove_safe(&array, fd, dv->devname, verbose)) {
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+ pr_err("Cannot remove %s from %s, array will be failed.\n",
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+ dv->devname, devname);
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+ if (sysfd >= 0)
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+ close(sysfd);
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+ goto abort;
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+ }
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+
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if ((sysfd >= 0 && write(sysfd, "faulty", 6) != 6) ||
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(sysfd < 0 && ioctl(fd, SET_DISK_FAULTY,
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rdev))) {
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--
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2.38.1
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