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Improve handling of filesystem versions

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Change mount code to diagnose filesystem versions that
are not supported by the current implementation.

Change upgrade code to do likewise and refuse to upgrade
a pool if any filesystems on it are a version which is
not supported by the current implementation.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Dan Swartzendruber <dswartz@druber.com>
Closes: #2616
This commit is contained in:
Dan Swartzendruber
2014-08-29 15:12:21 -04:00
committed by Brian Behlendorf
parent bcd9624d0f
commit 287be44f53
3 changed files with 75 additions and 21 deletions
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cmd/mount_zfs/mount_zfs.c
+42 -15
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@@ -363,6 +363,7 @@ main(int argc, char **argv)
{
zfs_handle_t *zhp;
char prop[ZFS_MAXPROPLEN];
uint64_t zfs_version = 0;
char mntopts[MNT_LINE_MAX] = { '\0' };
char badopt[MNT_LINE_MAX] = { '\0' };
char mtabopt[MNT_LINE_MAX] = { '\0' };
@@ -515,6 +516,18 @@ main(int argc, char **argv)
(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop,
sizeof (prop), NULL, NULL, 0, B_FALSE);
/*
* Fetch the max supported zfs version in case we get ENOTSUP
* back from the mount command, since we need the zfs handle
* to do so.
*/
zfs_version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
if (zfs_version == 0) {
fprintf(stderr, gettext("unable to fetch "
"ZFS version for filesystem '%s'\n"), dataset);
return (MOUNT_SYSERR);
}
zfs_close(zhp);
libzfs_fini(g_zfs);
@@ -551,22 +564,36 @@ main(int argc, char **argv)
if (!fake) {
error = mount(dataset, mntpoint, MNTTYPE_ZFS,
mntflags, mntopts);
if (error) {
switch (errno) {
case ENOENT:
(void) fprintf(stderr, gettext("mount point "
"'%s' does not exist\n"), mntpoint);
return (MOUNT_SYSERR);
case EBUSY:
(void) fprintf(stderr, gettext("filesystem "
"'%s' is already mounted\n"), dataset);
return (MOUNT_BUSY);
default:
(void) fprintf(stderr, gettext("filesystem "
"'%s' can not be mounted due to error "
"%d\n"), dataset, errno);
return (MOUNT_USAGE);
}
if (error) {
switch (errno) {
case ENOENT:
(void) fprintf(stderr, gettext("mount point "
"'%s' does not exist\n"), mntpoint);
return (MOUNT_SYSERR);
case EBUSY:
(void) fprintf(stderr, gettext("filesystem "
"'%s' is already mounted\n"), dataset);
return (MOUNT_BUSY);
case ENOTSUP:
if (zfs_version > ZPL_VERSION) {
(void) fprintf(stderr,
gettext("filesystem '%s' (v%d) is not "
"supported by this implementation of "
"ZFS (max v%d).\n"), dataset,
(int) zfs_version, (int) ZPL_VERSION);
} else {
(void) fprintf(stderr,
gettext("filesystem '%s' mount "
"failed for unknown reason.\n"), dataset);
}
return (MOUNT_SYSERR);
default:
(void) fprintf(stderr, gettext("filesystem "
"'%s' can not be mounted due to error "
"%d\n"), dataset, errno);
return (MOUNT_USAGE);
}
}