[PATCH][SRC][XENIAL] UBUNTU: SAUCE: Allow mounting datasets more than once (LP: #1759848)
Colin King
colin.king at canonical.com
Mon Jun 25 19:36:41 UTC 2018
From: Colin Ian King <colin.king at canonical.com>
BugLink: https://bugs.launchpad.net/bugs/1759848
Currently mounting an already mounted zfs dataset results in an
error, whereas it is typically allowed with other filesystems.
This causes some bad interactions with mount namespaces. Take
this sequence for example:
- Create a dataset
- Create a snapshot of the dataset
- Create a clone of the snapshot
- Create a new mount namespace
- Rename the original dataset
The rename results in unmounting and remounting the clone in the
original mount namespace, however the remount fails because the
dataset is still mounted in the new mount namespace. (Note that
this means the mount in the new mount namespace is never being
unmounted, so perhaps the unmount/remount of the clone isn't
actually necessary.)
The problem here is a result of the way mounting is implemented
in the kernel module. Since it is not mounting block devices it
uses mount_nodev() instead of the usual mount_bdev(). However,
mount_nodev() is written for filesystems for which each mount is
a new instance (i.e. a new super block), and zfs should be able
to detect when a mount request can be satisfied using an existing
super block.
Change zpl_mount() to call sget() directly with it's own test
callback. Passing the objset_t object as the fs data allows
checking if a superblock already exists for the dataset, and in
that case we just need to return a new reference for the sb's
root dentry.
[ Sync'd from zfsutils-linux, from a patch by Seth Forshee and
backported to zfs 0.6.5.6. Note that this also contains
some zfstutils changes between 0.6.5.6-0ubuntu20 and
0.6.5.6-0ubuntu24 which go also sync'd into this fix, which
is expected part of the zfs sync'ing ]
Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
zfs/META | 2 +-
zfs/Makefile.in | 2 +-
zfs/aclocal.m4 | 2 +-
zfs/config/kernel-fst-mount.m4 | 28 ++++++
zfs/config/kernel-mount-nodev.m4 | 20 ----
zfs/config/kernel.m4 | 2 +-
zfs/configure | 150 +++++++++---------------------
zfs/contrib/Makefile.in | 2 +-
zfs/contrib/bash_completion.d/Makefile.in | 2 +-
zfs/contrib/dracut/90zfs/Makefile.in | 2 +-
zfs/contrib/dracut/Makefile.in | 2 +-
zfs/contrib/initramfs/Makefile.in | 2 +-
zfs/include/Makefile.in | 2 +-
zfs/include/linux/Makefile.in | 2 +-
zfs/include/linux/vfs_compat.h | 24 +++++
zfs/include/sys/Makefile.in | 2 +-
zfs/include/sys/fm/Makefile.in | 2 +-
zfs/include/sys/fm/fs/Makefile.in | 2 +-
zfs/include/sys/fs/Makefile.in | 2 +-
zfs/module/zfs/zpl_super.c | 65 +++++++++++--
zfs/zfs_config.h.in | 6 +-
21 files changed, 175 insertions(+), 148 deletions(-)
create mode 100644 zfs/config/kernel-fst-mount.m4
delete mode 100644 zfs/config/kernel-mount-nodev.m4
diff --git a/zfs/META b/zfs/META
index 6c7026c..6837592 100644
--- a/zfs/META
+++ b/zfs/META
@@ -2,7 +2,7 @@ Meta: 1
Name: zfs
Branch: 1.0
Version: 0.6.5.6
-Release: 0ubuntu20
+Release: 0ubuntu24
Release-Tags: relext
License: CDDL
Author: OpenZFS on Linux
diff --git a/zfs/Makefile.in b/zfs/Makefile.in
index 8f68539..f9b0f69 100644
--- a/zfs/Makefile.in
+++ b/zfs/Makefile.in
@@ -140,6 +140,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -155,7 +156,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/aclocal.m4 b/zfs/aclocal.m4
index 391fd54..75a4bfe 100644
--- a/zfs/aclocal.m4
+++ b/zfs/aclocal.m4
@@ -1245,6 +1245,7 @@ m4_include([config/kernel-fallocate.m4])
m4_include([config/kernel-file-inode.m4])
m4_include([config/kernel-fmode-t.m4])
m4_include([config/kernel-follow-down-one.m4])
+m4_include([config/kernel-fst-mount.m4])
m4_include([config/kernel-fsync.m4])
m4_include([config/kernel-generic_io_acct.m4])
m4_include([config/kernel-get-disk-ro.m4])
@@ -1260,7 +1261,6 @@ m4_include([config/kernel-lookup-nameidata.m4])
m4_include([config/kernel-lseek-execute.m4])
m4_include([config/kernel-mk-request-fn.m4])
m4_include([config/kernel-mkdir-umode-t.m4])
-m4_include([config/kernel-mount-nodev.m4])
m4_include([config/kernel-open-bdev-exclusive.m4])
m4_include([config/kernel-put-link.m4])
m4_include([config/kernel-security-inode-init.m4])
diff --git a/zfs/config/kernel-fst-mount.m4 b/zfs/config/kernel-fst-mount.m4
new file mode 100644
index 0000000..a8ac50b
--- /dev/null
+++ b/zfs/config/kernel-fst-mount.m4
@@ -0,0 +1,28 @@
+dnl #
+dnl # 2.6.38 API change
+dnl # The .get_sb callback has been replaced by a .mount callback
+dnl # in the file_system_type structure.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FST_MOUNT], [
+ AC_MSG_CHECKING([whether fst->mount() exists])
+ ZFS_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+
+ static struct dentry *
+ mount(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data) {
+ struct dentry *d = NULL;
+ return (d);
+ }
+
+ static struct file_system_type fst __attribute__ ((unused)) = {
+ .mount = mount,
+ };
+ ],[
+ ],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_FST_MOUNT, 1, [fst->mount() exists])
+ ],[
+ AC_MSG_RESULT(no)
+ ])
+])
diff --git a/zfs/config/kernel-mount-nodev.m4 b/zfs/config/kernel-mount-nodev.m4
deleted file mode 100644
index 28a4515..0000000
--- a/zfs/config/kernel-mount-nodev.m4
+++ /dev/null
@@ -1,20 +0,0 @@
-dnl #
-dnl # 2.6.39 API change
-dnl # The .get_sb callback has been replaced by a .mount callback
-dnl # in the file_system_type structure. When using the new
-dnl # interface the caller must now use the mount_nodev() helper.
-dnl # This updated callback and helper no longer pass the vfsmount.
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_MOUNT_NODEV],
- [AC_MSG_CHECKING([whether mount_nodev() is available])
- ZFS_LINUX_TRY_COMPILE_SYMBOL([
- #include <linux/fs.h>
- ], [
- mount_nodev(NULL, 0, NULL, NULL);
- ], [mount_nodev], [fs/super.c], [
- AC_MSG_RESULT(yes)
- AC_DEFINE(HAVE_MOUNT_NODEV, 1, [mount_nodev() is available])
- ], [
- AC_MSG_RESULT(no)
- ])
-])
diff --git a/zfs/config/kernel.m4 b/zfs/config/kernel.m4
index 0eddc2f..0ba5f07d 100644
--- a/zfs/config/kernel.m4
+++ b/zfs/config/kernel.m4
@@ -77,7 +77,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_TRUNCATE_SETSIZE
ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
- ZFS_AC_KERNEL_MOUNT_NODEV
+ ZFS_AC_KERNEL_FST_MOUNT
ZFS_AC_KERNEL_SHRINK
ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
diff --git a/zfs/configure b/zfs/configure
index 8d61725..502dec9 100755
--- a/zfs/configure
+++ b/zfs/configure
@@ -21202,21 +21202,31 @@ fi
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether mount_nodev() is available" >&5
-$as_echo_n "checking whether mount_nodev() is available... " >&6; }
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether fst->mount() exists" >&5
+$as_echo_n "checking whether fst->mount() exists... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.c
- #include <linux/fs.h>
+ #include <linux/fs.h>
+
+ static struct dentry *
+ mount(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data) {
+ struct dentry *d = NULL;
+ return (d);
+ }
+
+ static struct file_system_type fst __attribute__ ((unused)) = {
+ .mount = mount,
+ };
int
main (void)
{
- mount_nodev(NULL, 0, NULL, NULL);
;
return 0;
@@ -21246,64 +21256,25 @@ _ACEOF
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then :
- rc=0
-else
- $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
- rc=1
-
-fi
- rm -Rf build
-
-
- if test $rc -ne 0; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
+$as_echo "#define HAVE_FST_MOUNT 1" >>confdefs.h
- else
- if test "x$enable_linux_builtin" != xyes; then
- grep -q -E '[[:space:]]mount_nodev[[:space:]]' \
- $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
- rc=$?
- if test $rc -ne 0; then
- export=0
- for file in fs/super.c; do
- grep -q -E "EXPORT_SYMBOL.*(mount_nodev)" \
- "$LINUX/$file" 2>/dev/null
- rc=$?
- if test $rc -eq 0; then
- export=1
- break;
- fi
- done
- if test $export -eq 0; then :
- rc=1
- else :
- rc=0
- fi
- else :
- rc=0
- fi
-
- fi
- if test $rc -ne 0; then :
+else
+ $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
- else :
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-
-$as_echo "#define HAVE_MOUNT_NODEV 1" >>confdefs.h
+fi
+ rm -Rf build
- fi
- fi
@@ -30596,21 +30567,31 @@ fi
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether mount_nodev() is available" >&5
-$as_echo_n "checking whether mount_nodev() is available... " >&6; }
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether fst->mount() exists" >&5
+$as_echo_n "checking whether fst->mount() exists... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.c
- #include <linux/fs.h>
+ #include <linux/fs.h>
+
+ static struct dentry *
+ mount(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data) {
+ struct dentry *d = NULL;
+ return (d);
+ }
+
+ static struct file_system_type fst __attribute__ ((unused)) = {
+ .mount = mount,
+ };
int
main (void)
{
- mount_nodev(NULL, 0, NULL, NULL);
;
return 0;
@@ -30640,64 +30621,25 @@ _ACEOF
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then :
- rc=0
-else
- $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
- rc=1
-
-fi
- rm -Rf build
-
-
- if test $rc -ne 0; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
+$as_echo "#define HAVE_FST_MOUNT 1" >>confdefs.h
- else
- if test "x$enable_linux_builtin" != xyes; then
- grep -q -E '[[:space:]]mount_nodev[[:space:]]' \
- $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
- rc=$?
- if test $rc -ne 0; then
- export=0
- for file in fs/super.c; do
- grep -q -E "EXPORT_SYMBOL.*(mount_nodev)" \
- "$LINUX/$file" 2>/dev/null
- rc=$?
- if test $rc -eq 0; then
- export=1
- break;
- fi
- done
- if test $export -eq 0; then :
- rc=1
- else :
- rc=0
- fi
- else :
- rc=0
- fi
-
- fi
- if test $rc -ne 0; then :
+else
+ $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
- else :
- { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-
-$as_echo "#define HAVE_MOUNT_NODEV 1" >>confdefs.h
+fi
+ rm -Rf build
- fi
- fi
diff --git a/zfs/contrib/Makefile.in b/zfs/contrib/Makefile.in
index 1ced2ca..c1204cd 100644
--- a/zfs/contrib/Makefile.in
+++ b/zfs/contrib/Makefile.in
@@ -129,6 +129,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -144,7 +145,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/contrib/bash_completion.d/Makefile.in b/zfs/contrib/bash_completion.d/Makefile.in
index a848010..f29d5cc 100644
--- a/zfs/contrib/bash_completion.d/Makefile.in
+++ b/zfs/contrib/bash_completion.d/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/contrib/dracut/90zfs/Makefile.in b/zfs/contrib/dracut/90zfs/Makefile.in
index 80f3262..63da6ed 100644
--- a/zfs/contrib/dracut/90zfs/Makefile.in
+++ b/zfs/contrib/dracut/90zfs/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/contrib/dracut/Makefile.in b/zfs/contrib/dracut/Makefile.in
index 5136e7f..eed070a 100644
--- a/zfs/contrib/dracut/Makefile.in
+++ b/zfs/contrib/dracut/Makefile.in
@@ -129,6 +129,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -144,7 +145,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/contrib/initramfs/Makefile.in b/zfs/contrib/initramfs/Makefile.in
index 5bf9c44..7a567be 100644
--- a/zfs/contrib/initramfs/Makefile.in
+++ b/zfs/contrib/initramfs/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/Makefile.in b/zfs/include/Makefile.in
index 5dcbe26..be50bca 100644
--- a/zfs/include/Makefile.in
+++ b/zfs/include/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/linux/Makefile.in b/zfs/include/linux/Makefile.in
index 52deade..70974df 100644
--- a/zfs/include/linux/Makefile.in
+++ b/zfs/include/linux/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/linux/vfs_compat.h b/zfs/include/linux/vfs_compat.h
index 8037055..f440f36 100644
--- a/zfs/include/linux/vfs_compat.h
+++ b/zfs/include/linux/vfs_compat.h
@@ -112,6 +112,30 @@ zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
#endif
/*
+ * 4.14 adds SB_* flag definitions, define them to MS_* equivalents
+ * if not set.
+ */
+#ifndef SB_RDONLY
+#define SB_RDONLY MS_RDONLY
+#endif
+
+#ifndef SB_SILENT
+#define SB_SILENT MS_SILENT
+#endif
+
+#ifndef SB_ACTIVE
+#define SB_ACTIVE MS_ACTIVE
+#endif
+
+#ifndef SB_POSIXACL
+#define SB_POSIXACL MS_POSIXACL
+#endif
+
+#ifndef SB_MANDLOCK
+#define SB_MANDLOCK MS_MANDLOCK
+#endif
+
+/*
* 2.6.38 API change,
* LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
*/
diff --git a/zfs/include/sys/Makefile.in b/zfs/include/sys/Makefile.in
index 20f498f..c0a0c2d 100644
--- a/zfs/include/sys/Makefile.in
+++ b/zfs/include/sys/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/sys/fm/Makefile.in b/zfs/include/sys/fm/Makefile.in
index d8d132f..b6f5397 100644
--- a/zfs/include/sys/fm/Makefile.in
+++ b/zfs/include/sys/fm/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/sys/fm/fs/Makefile.in b/zfs/include/sys/fm/fs/Makefile.in
index 2c61a5e..a1216fb 100644
--- a/zfs/include/sys/fm/fs/Makefile.in
+++ b/zfs/include/sys/fm/fs/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/include/sys/fs/Makefile.in b/zfs/include/sys/fs/Makefile.in
index 95d7b62..4715b29 100644
--- a/zfs/include/sys/fs/Makefile.in
+++ b/zfs/include/sys/fs/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-file-inode.m4 \
$(top_srcdir)/config/kernel-fmode-t.m4 \
$(top_srcdir)/config/kernel-follow-down-one.m4 \
+ $(top_srcdir)/config/kernel-fst-mount.m4 \
$(top_srcdir)/config/kernel-fsync.m4 \
$(top_srcdir)/config/kernel-generic_io_acct.m4 \
$(top_srcdir)/config/kernel-get-disk-ro.m4 \
@@ -145,7 +146,6 @@ am__aclocal_m4_deps = $(top_srcdir)/config/always-no-bool-compare.m4 \
$(top_srcdir)/config/kernel-lseek-execute.m4 \
$(top_srcdir)/config/kernel-mk-request-fn.m4 \
$(top_srcdir)/config/kernel-mkdir-umode-t.m4 \
- $(top_srcdir)/config/kernel-mount-nodev.m4 \
$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
$(top_srcdir)/config/kernel-put-link.m4 \
$(top_srcdir)/config/kernel-security-inode-init.m4 \
diff --git a/zfs/module/zfs/zpl_super.c b/zfs/module/zfs/zpl_super.c
index bcdbbd6..f75a0d8 100644
--- a/zfs/module/zfs/zpl_super.c
+++ b/zfs/module/zfs/zpl_super.c
@@ -443,12 +443,56 @@ zpl_fill_super(struct super_block *sb, void *data, int silent)
return (error);
}
-#ifdef HAVE_MOUNT_NODEV
+static int
+zpl_test_super(struct super_block *s, void *data)
+{
+ zfs_sb_t *zsb = s->s_fs_info;
+
+ objset_t *os = data;
+
+ if (zsb == NULL)
+ return (0);
+
+ return (os == zsb->z_os);
+}
+
+static struct super_block *
+zpl_mount_impl(struct file_system_type *fs_type, int flags, zfs_mntopts_t *zmo)
+{
+ struct super_block *s;
+ objset_t *os;
+ int err;
+
+ err = dmu_objset_hold(zmo->z_osname, FTAG, &os);
+ if (err)
+ return (ERR_PTR(-err));
+
+ s = zpl_sget(fs_type, zpl_test_super, set_anon_super, flags, os);
+ dmu_objset_rele(os, FTAG);
+ if (IS_ERR(s))
+ return (ERR_CAST(s));
+
+ if (s->s_root == NULL) {
+ err = zpl_fill_super(s, zmo, flags & SB_SILENT ? 1 : 0);
+ if (err) {
+ deactivate_locked_super(s);
+ return (ERR_PTR(err));
+ }
+ s->s_flags |= SB_ACTIVE;
+ } else if ((flags ^ s->s_flags) & SB_RDONLY) {
+ deactivate_locked_super(s);
+ return (ERR_PTR(-EBUSY));
+ }
+
+ return (s);
+}
+#ifdef HAVE_FST_MOUNT
static struct dentry *
zpl_mount(struct file_system_type *fs_type, int flags,
const char *osname, void *data)
{
zfs_mntopts_t *zmo = zfs_mntopts_alloc();
+ struct super_block *sb;
int error;
error = zpl_parse_options((char *)osname, (char *)data, zmo, B_FALSE);
@@ -456,8 +500,11 @@ zpl_mount(struct file_system_type *fs_type, int flags,
zfs_mntopts_free(zmo);
return (ERR_PTR(error));
}
+ sb = zpl_mount_impl(fs_type, flags, zmo);
+ if (IS_ERR(sb))
+ return (ERR_CAST(sb));
- return (mount_nodev(fs_type, flags, zmo, zpl_fill_super));
+ return (dget(sb->s_root));
}
#else
static int
@@ -465,6 +512,7 @@ zpl_get_sb(struct file_system_type *fs_type, int flags,
const char *osname, void *data, struct vfsmount *mnt)
{
zfs_mntopts_t *zmo = zfs_mntopts_alloc();
+ struct super_block *sb;
int error;
error = zpl_parse_options((char *)osname, (char *)data, zmo, B_FALSE);
@@ -472,10 +520,15 @@ zpl_get_sb(struct file_system_type *fs_type, int flags,
zfs_mntopts_free(zmo);
return (error);
}
+ sb = zpl_mount_impl(fs_type, flags, zmo);
+ if (IS_ERR(sb))
+ return (ERR_CAST(sb));
+
+ (void) simple_set_mnt(mnt, sb);
- return (get_sb_nodev(fs_type, flags, zmo, zpl_fill_super, mnt));
+ return (0);
}
-#endif /* HAVE_MOUNT_NODEV */
+#endif /* HAVE_FST_MOUNT */
static void
zpl_kill_sb(struct super_block *sb)
@@ -542,10 +595,10 @@ const struct super_operations zpl_super_operations = {
struct file_system_type zpl_fs_type = {
.owner = THIS_MODULE,
.name = ZFS_DRIVER,
-#ifdef HAVE_MOUNT_NODEV
+#ifdef HAVE_FST_MOUNT
.mount = zpl_mount,
#else
.get_sb = zpl_get_sb,
-#endif /* HAVE_MOUNT_NODEV */
+#endif /* HAVE_FST_MOUNT */
.kill_sb = zpl_kill_sb,
};
diff --git a/zfs/zfs_config.h.in b/zfs/zfs_config.h.in
index c5026c8..60cf471 100644
--- a/zfs/zfs_config.h.in
+++ b/zfs/zfs_config.h.in
@@ -162,6 +162,9 @@
/* sops->free_cached_objects() exists */
#undef HAVE_FREE_CACHED_OBJECTS
+/* fst->mount() exists */
+#undef HAVE_FST_MOUNT
+
/* fops->fsync() with range */
#undef HAVE_FSYNC_RANGE
@@ -252,9 +255,6 @@
/* Define to 1 if you have the `mlockall' function. */
#undef HAVE_MLOCKALL
-/* mount_nodev() is available */
-#undef HAVE_MOUNT_NODEV
-
/* sops->nr_cached_objects() exists */
#undef HAVE_NR_CACHED_OBJECTS
--
2.7.4
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