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authorVyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>2014-08-08 14:20:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-08 15:57:20 -0700
commitcaa05d49dfd7fe04820ba8b7e424343d5426a7f3 (patch)
treedb3d3a85b97d9cbedf982e323771c0f1ad634b5f /fs/nilfs2/the_nilfs.h
parentda7141fb78db915680616e15677539fc8140cf53 (diff)
downloadop-kernel-dev-caa05d49dfd7fe04820ba8b7e424343d5426a7f3.zip
op-kernel-dev-caa05d49dfd7fe04820ba8b7e424343d5426a7f3.tar.gz
nilfs2: add /sys/fs/nilfs2/<device>/superblock group
This patch adds creation of /sys/fs/nilfs2/<device>/superblock group. The superblock group contains attributes that describe superblock's details: (1) sb_write_time - show previous write time of super block in human-readable format. (2) sb_write_time_secs - show previous write time of super block in seconds. (3) sb_write_count - show write count of super block. (4) sb_update_frequency - show/set interval of periodical update of superblock (in seconds). You can set preferable frequency of superblock update by command: echo <value> > /sys/fs/nilfs2/<device>/superblock/sb_update_frequency Signed-off-by: Vyacheslav 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/the_nilfs.h')
-rw-r--r--fs/nilfs2/the_nilfs.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 34bc7bd..7fe8223 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -33,6 +33,7 @@
#include <linux/slab.h>
struct nilfs_sc_info;
+struct nilfs_sysfs_dev_subgroups;
/* the_nilfs struct */
enum {
@@ -54,6 +55,7 @@ enum {
* @ns_sbwcount: write count of super block
* @ns_sbsize: size of valid data in super block
* @ns_mount_state: file system state
+ * @ns_sb_update_freq: interval of periodical update of superblocks (in seconds)
* @ns_seg_seq: segment sequence counter
* @ns_segnum: index number of the latest full segment.
* @ns_nextnum: index number of the full segment index to be used next
@@ -97,6 +99,7 @@ enum {
* @ns_crc_seed: seed value of CRC32 calculation
* @ns_dev_kobj: /sys/fs/<nilfs>/<device>
* @ns_dev_kobj_unregister: completion state
+ * @ns_dev_subgroups: <device> subgroups pointer
*/
struct the_nilfs {
unsigned long ns_flags;
@@ -116,6 +119,7 @@ struct the_nilfs {
unsigned ns_sbwcount;
unsigned ns_sbsize;
unsigned ns_mount_state;
+ unsigned ns_sb_update_freq;
/*
* Following fields are dedicated to a writable FS-instance.
@@ -194,6 +198,7 @@ struct the_nilfs {
/* /sys/fs/<nilfs>/<device> */
struct kobject ns_dev_kobj;
struct completion ns_dev_kobj_unregister;
+ struct nilfs_sysfs_dev_subgroups *ns_dev_subgroups;
};
#define THE_NILFS_FNS(bit, name) \
@@ -260,7 +265,8 @@ struct nilfs_root {
static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
{
u64 t = get_seconds();
- return t < nilfs->ns_sbwtime || t > nilfs->ns_sbwtime + NILFS_SB_FREQ;
+ return t < nilfs->ns_sbwtime ||
+ t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;
}
static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
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