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From 945cc03b42ec947876cda10dff1bf76a446abbf1 Mon Sep 17 00:00:00 2001
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Message-Id: <945cc03b42ec947876cda10dff1bf76a446abbf1@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Wed, 3 Oct 2018 17:04:13 +0200
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Subject: [PATCH] virFileIsSharedFSType: Check for fuse.glusterfs too
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RHEL-7.7: https://bugzilla.redhat.com/show_bug.cgi?id=1632711
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RHEL-8.0: https://bugzilla.redhat.com/show_bug.cgi?id=1634782
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RHEL-7.6.z: https://bugzilla.redhat.com/show_bug.cgi?id=1635705
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GlusterFS is typically safe when it comes to migration. It's a
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network FS after all. However, it can be mounted via FUSE driver
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they provide. If that is the case we fail to identify it and
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think migration is not safe and require VIR_MIGRATE_UNSAFE flag.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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(cherry picked from commit 478da65fb46c866973886848ae17f1e16199a77d)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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---
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src/util/virfile.c | 77 ++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 75 insertions(+), 2 deletions(-)
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diff --git a/src/util/virfile.c b/src/util/virfile.c
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index 378d03ecf0..c87e26bf5b 100644
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--- a/src/util/virfile.c
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+++ b/src/util/virfile.c
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@@ -3534,6 +3534,76 @@ int virFilePrintf(FILE *fp, const char *msg, ...)
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# ifndef HUGETLBFS_MAGIC
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# define HUGETLBFS_MAGIC 0x958458f6
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# endif
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+# ifndef FUSE_SUPER_MAGIC
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+# define FUSE_SUPER_MAGIC 0x65735546
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+# endif
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+
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+# define PROC_MOUNTS "/proc/mounts"
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+
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+static int
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+virFileIsSharedFixFUSE(const char *path,
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+ long *f_type)
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+{
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+ char *dirpath = NULL;
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+ const char **mounts = NULL;
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+ size_t nmounts = 0;
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+ char *p;
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+ FILE *f = NULL;
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+ struct mntent mb;
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+ char mntbuf[1024];
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+ int ret = -1;
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+
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+ if (VIR_STRDUP(dirpath, path) < 0)
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+ return -1;
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+
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+ if (!(f = setmntent(PROC_MOUNTS, "r"))) {
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+ virReportSystemError(errno,
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+ _("Unable to open %s"),
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+ PROC_MOUNTS);
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+ goto cleanup;
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+ }
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+
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+ while (getmntent_r(f, &mb, mntbuf, sizeof(mntbuf))) {
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+ if (STRNEQ("fuse.glusterfs", mb.mnt_type))
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+ continue;
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+
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+ if (VIR_APPEND_ELEMENT_COPY(mounts, nmounts, mb.mnt_dir) < 0)
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+ goto cleanup;
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+ }
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+
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+ /* Add NULL sentinel so that this is a virStringList */
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+ if (VIR_REALLOC_N(mounts, nmounts + 1) < 0)
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+ goto cleanup;
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+ mounts[nmounts] = NULL;
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+
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+ do {
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+ if ((p = strrchr(dirpath, '/')) == NULL) {
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+ virReportSystemError(EINVAL,
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+ _("Invalid relative path '%s'"), path);
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+ goto cleanup;
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+ }
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+
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+ if (p == dirpath)
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+ *(p+1) = '\0';
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+ else
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+ *p = '\0';
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+
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+ if (virStringListHasString(mounts, dirpath)) {
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+ VIR_DEBUG("Found gluster FUSE mountpoint=%s for path=%s. "
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+ "Fixing shared FS type", dirpath, path);
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+ *f_type = GFS2_MAGIC;
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+ break;
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+ }
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+ } while (p != dirpath);
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+
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+ ret = 0;
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+ cleanup:
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+ endmntent(f);
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+ VIR_FREE(mounts);
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+ VIR_FREE(dirpath);
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+ return ret;
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+}
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+
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int
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virFileIsSharedFSType(const char *path,
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@@ -3581,6 +3651,11 @@ virFileIsSharedFSType(const char *path,
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return -1;
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}
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+ if (sb.f_type == FUSE_SUPER_MAGIC) {
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+ VIR_DEBUG("Found FUSE mount for path=%s. Trying to fix it", path);
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+ virFileIsSharedFixFUSE(path, (long *) &sb.f_type);
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+ }
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+
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VIR_DEBUG("Check if path %s with FS magic %lld is shared",
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path, (long long int)sb.f_type);
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@@ -3673,8 +3748,6 @@ virFileGetDefaultHugepageSize(unsigned long long *size)
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return ret;
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}
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-# define PROC_MOUNTS "/proc/mounts"
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-
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int
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virFileFindHugeTLBFS(virHugeTLBFSPtr *ret_fs,
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size_t *ret_nfs)
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--
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2.19.0
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