f2fs: add sysfs nodes to get runtime compression stat

I've added new sysfs nodes to show runtime compression stat since mount.
compr_written_block - show the block count written after compression
compr_saved_block - show the saved block count with compression
compr_new_inode - show the count of inode newly enabled for compression

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 0c391ab2d8b7..39b522ec73e7 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -12,6 +12,7 @@
 #include <linux/seq_file.h>
 #include <linux/unicode.h>
 #include <linux/ioprio.h>
+#include <linux/sysfs.h>
 
 #include "f2fs.h"
 #include "segment.h"
@@ -289,6 +290,17 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 		return len;
 	}
 
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (!strcmp(a->attr.name, "compr_written_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->compr_written_block);
+
+	if (!strcmp(a->attr.name, "compr_saved_block"))
+		return sysfs_emit(buf, "%llu\n", sbi->compr_saved_block);
+
+	if (!strcmp(a->attr.name, "compr_new_inode"))
+		return sysfs_emit(buf, "%u\n", sbi->compr_new_inode);
+#endif
+
 	ui = (unsigned int *)(ptr + a->offset);
 
 	return sprintf(buf, "%u\n", *ui);
@@ -465,6 +477,24 @@ out:
 		return count;
 	}
 
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (!strcmp(a->attr.name, "compr_written_block") ||
+		!strcmp(a->attr.name, "compr_saved_block")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->compr_written_block = 0;
+		sbi->compr_saved_block = 0;
+		return count;
+	}
+
+	if (!strcmp(a->attr.name, "compr_new_inode")) {
+		if (t != 0)
+			return -EINVAL;
+		sbi->compr_new_inode = 0;
+		return count;
+	}
+#endif
+
 	*ui = (unsigned int)t;
 
 	return count;
@@ -676,6 +706,9 @@ F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
 F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 F2FS_FEATURE_RO_ATTR(compression, FEAT_COMPRESSION);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_written_block, compr_written_block);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_saved_block, compr_saved_block);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_new_inode, compr_new_inode);
 #endif
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
@@ -740,6 +773,11 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(moved_blocks_background),
 	ATTR_LIST(avg_vblocks),
 #endif
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	ATTR_LIST(compr_written_block),
+	ATTR_LIST(compr_saved_block),
+	ATTR_LIST(compr_new_inode),
+#endif
 	NULL,
 };
 ATTRIBUTE_GROUPS(f2fs);