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Message-Id: <20220706020615.29938-1-duguoweisz@gmail.com>
Date: Wed, 6 Jul 2022 10:06:15 +0800
From: Guowei Du <duguoweisz@...il.com>
To: jaegeuk@...nel.org, chao@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, duguowei <duguowei@...omi.com>
Subject: [PATCH] f2fs: add some sysfs nodes for segment
From: duguowei <duguowei@...omi.com>
There are two ways to show meta segment information,
one is by dump.f2fs, another is by sysfs node. But,
sometimes dump needs root privilege,So adding a
few sysfs nodes.
The generic permission of node is 0444(S_IRUGO).
$ cd /sys/fs/f2fs/DEVICE/...
$ ls -l
...
-r--r--r-- 1 root root 4096 7月 5 23:21 reserved_segments
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count_ckpt
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count_main
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count_nat
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count_sit
-r--r--r-- 1 root root 4096 7月 5 23:21 segment_count_ssa
...
$ sudo dump.f2fs -d 1 DEVICE
...
Super block
segment_count [0x 26 : 38]
segment_count_ckpt [0x 2 : 2]
segment_count_sit [0x 2 : 2]
segment_count_nat [0x 2 : 2]
segment_count_ssa [0x 1 : 1]
segment_count_main [0x 1f : 31]
...
Checkpoint
rsvd_segment_count [0x e : 14]
...
Signed-off-by: duguowei <duguowei@...omi.com>
---
fs/f2fs/sysfs.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 4c50aedd5144..05350bba2c83 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -697,6 +697,55 @@ static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
return sprintf(buf, "unsupported\n");
}
+static ssize_t segment_count_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count));
+}
+
+static ssize_t segment_count_ckpt_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count_ckpt));
+}
+
+static ssize_t segment_count_sit_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count_sit));
+}
+
+static ssize_t segment_count_nat_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count_nat));
+}
+
+static ssize_t segment_count_ssa_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count_ssa));
+}
+
+static ssize_t segment_count_main_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(F2FS_RAW_SUPER(sbi)->segment_count_main));
+}
+
+static ssize_t reserved_segments_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return sprintf(buf, "%llu\n",
+ (unsigned long long)(reserved_segments(sbi)));
+}
+
#define F2FS_SB_FEATURE_RO_ATTR(_name, _feat) \
static struct f2fs_attr f2fs_attr_sb_##_name = { \
.attr = {.name = __stringify(_name), .mode = 0444 }, \
@@ -801,6 +850,13 @@ F2FS_GENERAL_RO_ATTR(moved_blocks_background);
F2FS_GENERAL_RO_ATTR(moved_blocks_foreground);
F2FS_GENERAL_RO_ATTR(avg_vblocks);
#endif
+F2FS_GENERAL_RO_ATTR(segment_count);
+F2FS_GENERAL_RO_ATTR(segment_count_ckpt);
+F2FS_GENERAL_RO_ATTR(segment_count_sit);
+F2FS_GENERAL_RO_ATTR(segment_count_nat);
+F2FS_GENERAL_RO_ATTR(segment_count_ssa);
+F2FS_GENERAL_RO_ATTR(segment_count_main);
+F2FS_GENERAL_RO_ATTR(reserved_segments);
#ifdef CONFIG_FS_ENCRYPTION
F2FS_FEATURE_RO_ATTR(encryption);
@@ -934,6 +990,13 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(gc_reclaimed_segments),
ATTR_LIST(max_fragment_chunk),
ATTR_LIST(max_fragment_hole),
+ ATTR_LIST(segment_count),
+ ATTR_LIST(segment_count_ckpt),
+ ATTR_LIST(segment_count_sit),
+ ATTR_LIST(segment_count_nat),
+ ATTR_LIST(segment_count_ssa),
+ ATTR_LIST(segment_count_main),
+ ATTR_LIST(reserved_segments),
NULL,
};
ATTRIBUTE_GROUPS(f2fs);
--
2.36.1
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