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zfs: bring back possibility to rewind the checkpoint from

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Add parsing of the rewind options.

When I was upstreaming the change [1], I omitted the part where we
detect that the pool should be rewind. When the FreeBSD repo has
synced with the OpenZFS, this part of the code was removed.

[1] FreeBSD repo: 277f38abff
[2] OpenZFS repo: f2c027bd6a

Originally reviewed by:		tsoome, allanjude
Originally reviewed by:		kevans (ok from high-level overview)

Signed-off-by: Mariusz Zaborski <oshogbo@vexillium.org>

PR:		254152
Reported by:	Zhenlei Huang <zlei.huang at gmail.com>
Obtained from:	https://github.com/openzfs/zfs/pull/11730

(cherry picked from commit 653ed678c7)
This commit is contained in:
Mariusz Zaborski 2021-03-13 12:56:17 +01:00
parent 6064ea8172
commit 6bbca5ca3a
1 changed files with 16 additions and 1 deletions
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17
sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
View file

@ -1291,6 +1291,18 @@ getpoolname(const char *osname, char *poolname)
return (0);
}
static void
fetch_osname_options(char *name, bool *checkpointrewind)
{
if (name[0] == '!') {
*checkpointrewind = true;
memmove(name, name + 1, strlen(name));
} else {
*checkpointrewind = false;
}
}
/*ARGSUSED*/
static int
zfs_mount(vfs_t *vfsp)
@ -1301,6 +1313,7 @@ zfs_mount(vfs_t *vfsp)
char *osname;
int error = 0;
int canwrite;
bool checkpointrewind;
if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
return (SET_ERROR(EINVAL));
@ -1314,6 +1327,8 @@ zfs_mount(vfs_t *vfsp)
secpolicy_fs_mount_clearopts(cr, vfsp);
}
fetch_osname_options(osname, &checkpointrewind);
/*
* Check for mount privilege?
*
@ -1392,7 +1407,7 @@ zfs_mount(vfs_t *vfsp)
error = getpoolname(osname, pname);
if (error == 0)
error = spa_import_rootpool(pname, false);
error = spa_import_rootpool(pname, checkpointrewind);
if (error)
goto out;
}