xfs: add debug sysfs attribute set
Create a top-level debug directory for global debug sysfs attributes. This directory is added and removed on XFS module initialization and removal respectively for DEBUG mode kernels only. It typically resides at /sys/fs/xfs/debug. It is located at the top level of the xfs sysfs hierarchy as attributes might define global behavior or behavior that must be configured before an xfs mount is available (e.g., log recovery behavior). Define the global debug kobject that represents the debug sysfs directory and add generic attribute show/store helpers to support future attributes. No debug attributes are exported as of yet. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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e1b05723ed
Коммит
65b65735fe
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@ -47,6 +47,7 @@
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#include "xfs_dinode.h"
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#include "xfs_filestream.h"
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#include "xfs_quota.h"
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#include "xfs_sysfs.h"
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#include <linux/namei.h>
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#include <linux/init.h>
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@ -61,7 +62,11 @@
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static const struct super_operations xfs_super_operations;
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static kmem_zone_t *xfs_ioend_zone;
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mempool_t *xfs_ioend_pool;
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struct kset *xfs_kset;
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struct kset *xfs_kset; /* top-level xfs sysfs dir */
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#ifdef DEBUG
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static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
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#endif
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#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
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#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
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@ -1769,9 +1774,16 @@ init_xfs_fs(void)
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goto out_sysctl_unregister;;
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}
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error = xfs_qm_init();
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#ifdef DEBUG
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xfs_dbg_kobj.kobject.kset = xfs_kset;
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error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
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if (error)
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goto out_kset_unregister;
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#endif
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error = xfs_qm_init();
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if (error)
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goto out_remove_kobj;
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error = register_filesystem(&xfs_fs_type);
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if (error)
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@ -1780,7 +1792,11 @@ init_xfs_fs(void)
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out_qm_exit:
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xfs_qm_exit();
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out_remove_kobj:
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#ifdef DEBUG
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xfs_sysfs_del(&xfs_dbg_kobj);
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out_kset_unregister:
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#endif
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kset_unregister(xfs_kset);
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out_sysctl_unregister:
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xfs_sysctl_unregister();
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@ -1803,6 +1819,9 @@ exit_xfs_fs(void)
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{
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xfs_qm_exit();
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unregister_filesystem(&xfs_fs_type);
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#ifdef DEBUG
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xfs_sysfs_del(&xfs_dbg_kobj);
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#endif
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kset_unregister(xfs_kset);
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xfs_sysctl_unregister();
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xfs_cleanup_procfs();
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@ -51,6 +51,49 @@ struct kobj_type xfs_mp_ktype = {
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.release = xfs_sysfs_release,
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};
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#ifdef DEBUG
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/* debug */
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static struct attribute *xfs_dbg_attrs[] = {
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NULL,
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};
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STATIC ssize_t
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xfs_dbg_show(
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struct kobject *kobject,
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struct attribute *attr,
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char *buf)
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{
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struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
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return xfs_attr->show ? xfs_attr->show(buf, NULL) : 0;
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}
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STATIC ssize_t
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xfs_dbg_store(
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struct kobject *kobject,
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struct attribute *attr,
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const char *buf,
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size_t count)
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{
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struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
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return xfs_attr->store ? xfs_attr->store(buf, count, NULL) : 0;
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}
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static struct sysfs_ops xfs_dbg_ops = {
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.show = xfs_dbg_show,
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.store = xfs_dbg_store,
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};
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struct kobj_type xfs_dbg_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_dbg_ops,
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.default_attrs = xfs_dbg_attrs,
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};
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#endif /* DEBUG */
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/* xlog */
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STATIC ssize_t
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@ -20,6 +20,7 @@
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#define __XFS_SYSFS_H__
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extern struct kobj_type xfs_mp_ktype; /* xfs_mount */
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extern struct kobj_type xfs_dbg_ktype; /* debug */
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extern struct kobj_type xfs_log_ktype; /* xlog */
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static inline struct xfs_kobj *
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