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| author | Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> | 2014-08-08 23:20:42 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-09 00:57:20 +0200 |
| commit | caa05d49dfd7fe04820ba8b7e424343d5426a7f3 (patch) | |
| tree | db3d3a85b97d9cbedf982e323771c0f1ad634b5f /fs/nilfs2/the_nilfs.h | |
| parent | nilfs2: add /sys/fs/nilfs2/<device> group (diff) | |
| download | linux-caa05d49dfd7fe04820ba8b7e424343d5426a7f3.tar.xz linux-caa05d49dfd7fe04820ba8b7e424343d5426a7f3.zip | |
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.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 34bc7bd57b0b..7fe822307f98 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) |