Viewing: ext4-export-mb-stream-allocator-variables.patch
commit 75703118588f2b23afd8c8815e5ebb768fc7a8ff
Author: Lokesh Nagappa Jaliminche <lokesh.jaliminche@seagate.com>
AuthorDate: Mon Jul 4 14:34:20 2016 +0530
LU-8365 ldiskfs: procfs entries for mballoc
Export mballoc streaming block allocator variables
mb_last_group and mb_last_start through procfs.
Test-Parameters: testgroup=review-ldiskfs
Cray-bug-id: LUS-3176
Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@seagate.com>
Signed-off-by: Alexander Zarochentsev <c17826@cray.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I5dd00503a81c6819751c9f99b64615b497ef4e28
Reviewed-on: https://review.whamcloud.com/21142
---
fs/ext4/ext4.h | 2 ++
fs/ext4/mballoc.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4/sysfs.c | 4 ++++
3 files changed, 64 insertions(+)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1e0cb82..60a780b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3053,6 +3053,8 @@ int __init ext4_fc_init_dentry_cache(void);
/* mballoc.c */
extern const struct proc_ops ext4_seq_prealloc_table_fops;
+extern const struct proc_ops ext4_seq_mb_last_group_fops;
+extern int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v);
extern const struct seq_operations ext4_mb_seq_groups_ops;
extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
extern long ext4_mb_stats;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 3a18aff..269cf5a 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3169,6 +3169,64 @@ static struct kmem_cache *get_groupinfo_cache(int blocksize_bits)
return cachep;
}
+#define EXT4_MB_MAX_INPUT_STRING_SIZE 32
+
+static ssize_t ext4_mb_last_group_write(struct file *file,
+ const char __user *buf,
+ size_t cnt, loff_t *pos)
+{
+ char dummy[EXT4_MB_MAX_INPUT_STRING_SIZE + 1];
+ struct super_block *sb = PDE_DATA(file_inode(file));
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned long val;
+ char *end;
+
+ if (cnt > EXT4_MB_MAX_INPUT_STRING_SIZE)
+ return -EINVAL;
+ if (copy_from_user(dummy, buf, cnt))
+ return -EFAULT;
+ dummy[cnt] = '\0';
+ val = simple_strtoul(dummy, &end, 0);
+ if (dummy == end)
+ return -EINVAL;
+ if (val >= ext4_get_groups_count(sb))
+ return -ERANGE;
+ spin_lock(&sbi->s_md_lock);
+ sbi->s_mb_last_group = val;
+ sbi->s_mb_last_start = 0;
+ spin_unlock(&sbi->s_md_lock);
+ return cnt;
+}
+
+static int ext4_mb_seq_last_group_seq_show(struct seq_file *m, void *v)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(m->private);
+
+ seq_printf(m , "%ld\n", sbi->s_mb_last_group);
+ return 0;
+}
+
+static int ext4_mb_seq_last_group_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ext4_mb_seq_last_group_seq_show, PDE_DATA(inode));
+}
+
+const struct proc_ops ext4_seq_mb_last_group_fops = {
+ .proc_open = ext4_mb_seq_last_group_open,
+ .proc_read = seq_read,
+ .proc_lseek = seq_lseek,
+ .proc_release = seq_release,
+ .proc_write = ext4_mb_last_group_write,
+};
+
+int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(m->private);
+
+ seq_printf(m , "%ld\n", sbi->s_mb_last_start);
+ return 0;
+}
+
/*
* Allocate the top-level s_group_info array for the specified number
* of groups
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index ed7a7e5..c1ef6e3 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -555,6 +555,10 @@ int ext4_register_sysfs(struct super_block *sb)
&ext4_mb_seq_groups_ops, sb);
proc_create_data("prealloc_table", S_IRUGO, sbi->s_proc,
&ext4_seq_prealloc_table_fops, sb);
+ proc_create_data("mb_last_group", S_IRUGO, sbi->s_proc,
+ &ext4_seq_mb_last_group_fops, sb);
+ proc_create_single_data("mb_last_start", S_IRUGO, sbi->s_proc,
+ ext4_mb_seq_last_start_seq_show, sb);
proc_create_single_data("mb_stats", 0444, sbi->s_proc,
ext4_seq_mb_stats_show, sb);
proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc,
--
2.31.1
