Commit ef43d5cd authored by Vyacheslav Dubeyko's avatar Vyacheslav Dubeyko Committed by Linus Torvalds
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nilfs2: add /sys/fs/nilfs2/<device>/segments group 



This patch adds creation of /sys/fs/nilfs2/<device>/segments
group.

The segments group contains attributes that describe
details about volume's segments:
(1) segments_number - show number of segments on volume.
(2) blocks_per_segment - show number of blocks in segment.
(3) clean_segments - show count of clean segments.
(4) dirty_segments - show count of dirty segments.

Signed-off-by: default avatarVyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent abc968db

Documentation/ABI/testing/sysfs-fs-nilfs2

+31 −0
Original line number Diff line number Diff line
@@ -179,3 +179,34 @@ Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com> 
Description:

		Describe attributes of /sys/fs/nilfs2/<device>/segctor

		group.



What:		/sys/fs/nilfs2/<device>/segments/segments_number

Date:		April 2014

Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>

Description:

		Show number of segments on a volume.



What:		/sys/fs/nilfs2/<device>/segments/blocks_per_segment

Date:		April 2014

Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>

Description:

		Show number of blocks in segment.



What:		/sys/fs/nilfs2/<device>/segments/clean_segments

Date:		April 2014

Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>

Description:

		Show count of clean segments.



What:		/sys/fs/nilfs2/<device>/segments/dirty_segments

Date:		April 2014

Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>

Description:

		Show count of dirty segments.



What:		/sys/fs/nilfs2/<device>/segments/README

Date:		April 2014

Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>

Description:

		Describe attributes of /sys/fs/nilfs2/<device>/segments

		group.

fs/nilfs2/sysfs.c

+98 −1
Original line number Diff line number Diff line
@@ -111,6 +111,95 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \ 
	kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \

}



/************************************************************************

 *                        NILFS segments attrs                          *

 ************************************************************************/



static ssize_t

nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,

				     struct the_nilfs *nilfs,

				     char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);

}



static ssize_t

nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,

					struct the_nilfs *nilfs,

					char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);

}



static ssize_t

nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,

				    struct the_nilfs *nilfs,

				    char *buf)

{

	unsigned long ncleansegs;



	down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);

	ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);

	up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);



	return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);

}



static ssize_t

nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,

				    struct the_nilfs *nilfs,

				    char *buf)

{

	struct nilfs_sustat sustat;

	int err;



	down_read(&nilfs->ns_segctor_sem);

	err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);

	up_read(&nilfs->ns_segctor_sem);

	if (err < 0) {

		printk(KERN_ERR "NILFS: unable to get segment stat: err=%d\n",

			err);

		return err;

	}



	return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);

}



static const char segments_readme_str[] =

	"The segments group contains attributes that describe\n"

	"details about volume's segments.\n\n"

	"(1) segments_number\n\tshow number of segments on volume.\n\n"

	"(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"

	"(3) clean_segments\n\tshow count of clean segments.\n\n"

	"(4) dirty_segments\n\tshow count of dirty segments.\n\n";



static ssize_t

nilfs_segments_README_show(struct nilfs_segments_attr *attr,

			    struct the_nilfs *nilfs,

			    char *buf)

{

	return snprintf(buf, PAGE_SIZE, segments_readme_str);

}



NILFS_SEGMENTS_RO_ATTR(segments_number);

NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);

NILFS_SEGMENTS_RO_ATTR(clean_segments);

NILFS_SEGMENTS_RO_ATTR(dirty_segments);

NILFS_SEGMENTS_RO_ATTR(README);



static struct attribute *nilfs_segments_attrs[] = {

	NILFS_SEGMENTS_ATTR_LIST(segments_number),

	NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),

	NILFS_SEGMENTS_ATTR_LIST(clean_segments),

	NILFS_SEGMENTS_ATTR_LIST(dirty_segments),

	NILFS_SEGMENTS_ATTR_LIST(README),

	NULL,

};



NILFS_DEV_INT_GROUP_OPS(segments, dev);

NILFS_DEV_INT_GROUP_TYPE(segments, dev);

NILFS_DEV_INT_GROUP_FNS(segments, dev);



/************************************************************************

 *                        NILFS segctor attrs                           *

 ************************************************************************/
@@ -664,10 +753,14 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) 
	if (err)

		goto free_dev_subgroups;



	err = nilfs_sysfs_create_superblock_group(nilfs);

	err = nilfs_sysfs_create_segments_group(nilfs);

	if (err)

		goto cleanup_dev_kobject;



	err = nilfs_sysfs_create_superblock_group(nilfs);

	if (err)

		goto delete_segments_group;



	err = nilfs_sysfs_create_segctor_group(nilfs);

	if (err)

		goto delete_superblock_group;
@@ -677,6 +770,9 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) 
delete_superblock_group:

	nilfs_sysfs_delete_superblock_group(nilfs);



delete_segments_group:

	nilfs_sysfs_delete_segments_group(nilfs);



cleanup_dev_kobject:

	kobject_del(&nilfs->ns_dev_kobj);
@@ -689,6 +785,7 @@ failed_create_device_group: 


void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)

{

	nilfs_sysfs_delete_segments_group(nilfs);

	nilfs_sysfs_delete_superblock_group(nilfs);

	nilfs_sysfs_delete_segctor_group(nilfs);

	kobject_del(&nilfs->ns_dev_kobj);

fs/nilfs2/sysfs.h

+14 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ 
 * @sg_superblock_kobj_unregister: completion state

 * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor

 * @sg_segctor_kobj_unregister: completion state

 * @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments

 * @sg_segments_kobj_unregister: completion state

 */

struct nilfs_sysfs_dev_subgroups {

	/* /sys/fs/<nilfs>/<device>/superblock */
@@ -39,6 +41,10 @@ struct nilfs_sysfs_dev_subgroups { 
	/* /sys/fs/<nilfs>/<device>/segctor */

	struct kobject sg_segctor_kobj;

	struct completion sg_segctor_kobj_unregister;



	/* /sys/fs/<nilfs>/<device>/segments */

	struct kobject sg_segments_kobj;

	struct completion sg_segments_kobj_unregister;

};



#define NILFS_COMMON_ATTR_STRUCT(name) \
@@ -62,6 +68,7 @@ struct nilfs_##name##_attr { \ 
};



NILFS_DEV_ATTR_STRUCT(dev);

NILFS_DEV_ATTR_STRUCT(segments);

NILFS_DEV_ATTR_STRUCT(superblock);

NILFS_DEV_ATTR_STRUCT(segctor);
@@ -92,6 +99,11 @@ NILFS_DEV_ATTR_STRUCT(segctor); 
#define NILFS_DEV_RW_ATTR(name) \

	NILFS_RW_ATTR(dev, name)



#define NILFS_SEGMENTS_RO_ATTR(name) \

	NILFS_RO_ATTR(segments, name)

#define NILFS_SEGMENTS_RW_ATTR(name) \

	NILFS_RW_ATTR(segs_info, name)



#define NILFS_SUPERBLOCK_RO_ATTR(name) \

	NILFS_RO_ATTR(superblock, name)

#define NILFS_SUPERBLOCK_RW_ATTR(name) \
@@ -108,6 +120,8 @@ NILFS_DEV_ATTR_STRUCT(segctor); 
	(&nilfs_feature_attr_##name.attr)

#define NILFS_DEV_ATTR_LIST(name) \

	(&nilfs_dev_attr_##name.attr)

#define NILFS_SEGMENTS_ATTR_LIST(name) \

	(&nilfs_segments_attr_##name.attr)

#define NILFS_SUPERBLOCK_ATTR_LIST(name) \

	(&nilfs_superblock_attr_##name.attr)

#define NILFS_SEGCTOR_ATTR_LIST(name) \

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