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xfs: add xfs_mount sysfs kobject

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Embed a base kobject into xfs_mount. This creates a kobject associated
with each XFS mount and a subdirectory in sysfs with the name of the
filesystem. The subdirectory lifecycle matches that of the mount. Also
add the new xfs_sysfs.[c,h] source files with some XFS sysfs
infrastructure to facilitate attribute creation.

Note that there are currently no attributes exported as part of the
xfs_mount kobject. It exists solely to serve as a per-mount container
for child objects.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster 2014-07-15 08:07:01 +10:00 committed by Dave Chinner
parent 3d8712265c
commit a31b1d3d89
6 changed files with 133 additions and 1 deletions
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1
fs/xfs/Makefile
View File

@ -86,6 +86,7 @@ xfs-y += xfs_aops.o \
xfs_mru_cache.o \
xfs_super.o \
xfs_symlink.o \
xfs_sysfs.o \
xfs_trans.o \
xfs_xattr.o \
kmem.o \

11
fs/xfs/xfs_linux.h
View File

@ -191,6 +191,17 @@ typedef __uint64_t __psunsigned_t;
#define MAX(a,b) (max(a,b))
#define howmany(x, y) (((x)+((y)-1))/(y))
/*
* XFS wrapper structure for sysfs support. It depends on external data
* structures and is embedded in various internal data structures to implement
* the XFS sysfs object heirarchy. Define it here for broad access throughout
* the codebase.
*/
struct xfs_kobj {
struct kobject kobject;
struct completion complete;
};
/* Kernel uid/gid conversion. These are used to convert to/from the on disk
* uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
* The conversion here is type only, the value will remain the same since we

14
fs/xfs/xfs_mount.c
View File

@ -42,6 +42,7 @@
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_dinode.h"
#include "xfs_sysfs.h"
#ifdef HAVE_PERCPU_SB
@ -60,6 +61,8 @@ static DEFINE_MUTEX(xfs_uuid_table_mutex);
static int xfs_uuid_table_size;
static uuid_t *xfs_uuid_table;
extern struct kset *xfs_kset;
/*
* See if the UUID is unique among mounted XFS filesystems.
* Mount fails if UUID is nil or a FS with the same UUID is already mounted.
@ -731,10 +734,15 @@ xfs_mountfs(
xfs_set_maxicount(mp);
error = xfs_uuid_mount(mp);
mp->m_kobj.kobject.kset = xfs_kset;
error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype, NULL, mp->m_fsname);
if (error)
goto out;
error = xfs_uuid_mount(mp);
if (error)
goto out_remove_sysfs;
/*
* Set the minimum read and write sizes
*/
@ -989,6 +997,8 @@ xfs_mountfs(
xfs_da_unmount(mp);
out_remove_uuid:
xfs_uuid_unmount(mp);
out_remove_sysfs:
xfs_sysfs_del(&mp->m_kobj);
out:
return error;
}
@ -1071,6 +1081,8 @@ xfs_unmountfs(
xfs_errortag_clearall(mp, 0);
#endif
xfs_free_perag(mp);
xfs_sysfs_del(&mp->m_kobj);
}
int

1
fs/xfs/xfs_mount.h
View File

@ -166,6 +166,7 @@ typedef struct xfs_mount {
on the next remount,rw */
int64_t m_low_space[XFS_LOWSP_MAX];
/* low free space thresholds */
struct xfs_kobj m_kobj;
struct workqueue_struct *m_data_workqueue;
struct workqueue_struct *m_unwritten_workqueue;

49
fs/xfs/xfs_sysfs.c Normal file
View File

@ -0,0 +1,49 @@
/*
* Copyright (c) 2014 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_sysfs.h"
struct xfs_sysfs_attr {
struct attribute attr;
ssize_t (*show)(char *buf, void *data);
ssize_t (*store)(const char *buf, size_t count, void *data);
};
static inline struct xfs_sysfs_attr *
to_attr(struct attribute *attr)
{
return container_of(attr, struct xfs_sysfs_attr, attr);
}
#define XFS_SYSFS_ATTR_RW(name) \
static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
#define XFS_SYSFS_ATTR_RO(name) \
static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
/*
* xfs_mount kobject. This currently has no attributes and thus no need for show
* and store helpers. The mp kobject serves as the per-mount parent object that
* is identified by the fsname under sysfs.
*/
struct kobj_type xfs_mp_ktype = {
.release = xfs_sysfs_release,
};

58
fs/xfs/xfs_sysfs.h Normal file
View File

@ -0,0 +1,58 @@
/*
* Copyright (c) 2014 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_SYSFS_H__
#define __XFS_SYSFS_H__
extern struct kobj_type xfs_mp_ktype; /* xfs_mount */
static inline struct xfs_kobj *
to_kobj(struct kobject *kobject)
{
return container_of(kobject, struct xfs_kobj, kobject);
}
static inline void
xfs_sysfs_release(struct kobject *kobject)
{
struct xfs_kobj *kobj = to_kobj(kobject);
complete(&kobj->complete);
}
static inline int
xfs_sysfs_init(
struct xfs_kobj *kobj,
struct kobj_type *ktype,
struct xfs_kobj *parent_kobj,
const char *name)
{
init_completion(&kobj->complete);
return kobject_init_and_add(&kobj->kobject, ktype,
&parent_kobj->kobject, "%s", name);
}
static inline void
xfs_sysfs_del(
struct xfs_kobj *kobj)
{
kobject_del(&kobj->kobject);
kobject_put(&kobj->kobject);
wait_for_completion(&kobj->complete);
}
#endif /* __XFS_SYSFS_H__ */