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`mount.zfs -o zfsutil` leverages `zfs_mount_at()` 

Using `zfs_mount_at()` gives opportunity to properly propagate
mountopts from what's stored in a pool to the `mount(2)` syscall
invocation. It fixes cases when mount options are set to incorrect
values and rectification is impossible (e. g. Linux initrd boot
sequence in #7947).
Moved debug information printing after all variables are
initialized - printed text reflects what is passed to `mount(2)`.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Issue #7947 
Closes #13021
This commit is contained in:
Damian Szuberski 2022-02-08 19:53:23 +01:00 committed by Tony Hutter
parent a61915e086
commit bb271d67e8
1 changed files with 34 additions and 13 deletions
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41
cmd/mount_zfs/mount_zfs.c
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@ -246,13 +246,6 @@ main(int argc, char **argv)
}
}
if (verbose)
(void) fprintf(stdout, gettext("mount.zfs:\n"
" dataset: \"%s\"\n mountpoint: \"%s\"\n"
" mountflags: 0x%lx\n zfsflags: 0x%lx\n"
" mountopts: \"%s\"\n mtabopts: \"%s\"\n"),
dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt);
if (mntflags & MS_REMOUNT) {
nomtab = 1;
remount = 1;
@ -275,7 +268,10 @@ main(int argc, char **argv)
return (MOUNT_USAGE);
}
if (!zfsutil || sloppy ||
libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) {
zfs_adjust_mount_options(zhp, mntpoint, mntopts, mtabopt);
}
/* treat all snapshots as legacy mount points */
if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT)
@ -293,11 +289,10 @@ main(int argc, char **argv)
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);
return (MOUNT_SYSERR);
}
/*
* Legacy mount points may only be mounted using 'mount', never using
@ -316,6 +311,8 @@ main(int argc, char **argv)
"Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n"
"See zfs(8) for more information.\n"),
dataset, mntpoint, dataset, mntpoint);
zfs_close(zhp);
libzfs_fini(g_zfs);
return (MOUNT_USAGE);
}
@ -326,13 +323,37 @@ main(int argc, char **argv)
"Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n"
"See zfs(8) for more information.\n"),
dataset, "legacy", dataset);
zfs_close(zhp);
libzfs_fini(g_zfs);
return (MOUNT_USAGE);
}
if (verbose)
(void) fprintf(stdout, gettext("mount.zfs:\n"
" dataset: \"%s\"\n mountpoint: \"%s\"\n"
" mountflags: 0x%lx\n zfsflags: 0x%lx\n"
" mountopts: \"%s\"\n mtabopts: \"%s\"\n"),
dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt);
if (!fake) {
if (zfsutil && !sloppy &&
!libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) {
error = zfs_mount_at(zhp, mntopts, mntflags, mntpoint);
if (error) {
(void) fprintf(stderr, "zfs_mount_at() failed: "
"%s", libzfs_error_description(g_zfs));
zfs_close(zhp);
libzfs_fini(g_zfs);
return (MOUNT_SYSERR);
}
} else {
error = mount(dataset, mntpoint, MNTTYPE_ZFS,
mntflags, mntopts);
}
}
zfs_close(zhp);
libzfs_fini(g_zfs);
if (error) {
switch (errno) {