From 02a0ba1c60c2ad532322089a60256c8b0f46678c Mon Sep 17 00:00:00 2001 From: Vyacheslav Dubeyko Date: Fri, 8 Aug 2014 14:20:48 -0700 Subject: nilfs2: add /sys/fs/nilfs2//checkpoints group This patch adds creation of /sys/fs/nilfs2//checkpoints group. The checkpoints group contains attributes that describe details about volume's checkpoints: (1) checkpoints_number - show number of checkpoints on volume. (2) snapshots_number - show number of snapshots on volume. (3) last_seg_checkpoint - show checkpoint number of the latest segment. (4) next_checkpoint - show next checkpoint number. Signed-off-by: Vyacheslav Dubeyko Cc: Vyacheslav Dubeyko Cc: Ryusuke Konishi Cc: Michael L. Semon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nilfs2/sysfs.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 122 insertions(+), 1 deletion(-) (limited to 'fs/nilfs2/sysfs.c') diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c index fe8e1411dc6a..5cc735fcc1d5 100644 --- a/fs/nilfs2/sysfs.c +++ b/fs/nilfs2/sysfs.c @@ -111,6 +111,119 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \ kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \ } +/************************************************************************ + * NILFS checkpoints attrs * + ************************************************************************/ + +static ssize_t +nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr, + struct the_nilfs *nilfs, + char *buf) +{ + __u64 ncheckpoints; + struct nilfs_cpstat cpstat; + int err; + + down_read(&nilfs->ns_segctor_sem); + err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); + up_read(&nilfs->ns_segctor_sem); + if (err < 0) { + printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n", + err); + return err; + } + + ncheckpoints = cpstat.cs_ncps; + + return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints); +} + +static ssize_t +nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr, + struct the_nilfs *nilfs, + char *buf) +{ + __u64 nsnapshots; + struct nilfs_cpstat cpstat; + int err; + + down_read(&nilfs->ns_segctor_sem); + err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat); + up_read(&nilfs->ns_segctor_sem); + if (err < 0) { + printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n", + err); + return err; + } + + nsnapshots = cpstat.cs_nsss; + + return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots); +} + +static ssize_t +nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr, + struct the_nilfs *nilfs, + char *buf) +{ + __u64 last_cno; + + spin_lock(&nilfs->ns_last_segment_lock); + last_cno = nilfs->ns_last_cno; + spin_unlock(&nilfs->ns_last_segment_lock); + + return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno); +} + +static ssize_t +nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr, + struct the_nilfs *nilfs, + char *buf) +{ + __u64 cno; + + down_read(&nilfs->ns_sem); + cno = nilfs->ns_cno; + up_read(&nilfs->ns_sem); + + return snprintf(buf, PAGE_SIZE, "%llu\n", cno); +} + +static const char checkpoints_readme_str[] = + "The checkpoints group contains attributes that describe\n" + "details about volume's checkpoints.\n\n" + "(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n" + "(2) snapshots_number\n\tshow number of snapshots on volume.\n\n" + "(3) last_seg_checkpoint\n" + "\tshow checkpoint number of the latest segment.\n\n" + "(4) next_checkpoint\n\tshow next checkpoint number.\n\n"; + +static ssize_t +nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr, + struct the_nilfs *nilfs, char *buf) +{ + return snprintf(buf, PAGE_SIZE, checkpoints_readme_str); +} + +NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number); +NILFS_CHECKPOINTS_RO_ATTR(snapshots_number); +NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint); +NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint); +NILFS_CHECKPOINTS_RO_ATTR(README); + +static struct attribute *nilfs_checkpoints_attrs[] = { + NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number), + NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number), + NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint), + NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint), + NILFS_CHECKPOINTS_ATTR_LIST(README), + NULL, +}; + +NILFS_DEV_INT_GROUP_OPS(checkpoints, dev); +NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev); +NILFS_DEV_INT_GROUP_FNS(checkpoints, dev); + /************************************************************************ * NILFS segments attrs * ************************************************************************/ @@ -753,10 +866,14 @@ int nilfs_sysfs_create_device_group(struct super_block *sb) if (err) goto free_dev_subgroups; - err = nilfs_sysfs_create_segments_group(nilfs); + err = nilfs_sysfs_create_checkpoints_group(nilfs); if (err) goto cleanup_dev_kobject; + err = nilfs_sysfs_create_segments_group(nilfs); + if (err) + goto delete_checkpoints_group; + err = nilfs_sysfs_create_superblock_group(nilfs); if (err) goto delete_segments_group; @@ -773,6 +890,9 @@ delete_superblock_group: delete_segments_group: nilfs_sysfs_delete_segments_group(nilfs); +delete_checkpoints_group: + nilfs_sysfs_delete_checkpoints_group(nilfs); + cleanup_dev_kobject: kobject_del(&nilfs->ns_dev_kobj); @@ -785,6 +905,7 @@ failed_create_device_group: void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs) { + nilfs_sysfs_delete_checkpoints_group(nilfs); nilfs_sysfs_delete_segments_group(nilfs); nilfs_sysfs_delete_superblock_group(nilfs); nilfs_sysfs_delete_segctor_group(nilfs); -- cgit v1.2.3