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Message-ID: <YK5UOfzwdZni7c5W@google.com>
Date: Wed, 26 May 2021 06:59:21 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2 v2] f2fs: support RO feature
Given RO feature in superblock, we don't need to check provisioning/reserve
spaces and SSA area.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/f2fs.h | 2 ++
fs/f2fs/segment.c | 4 ++++
fs/f2fs/super.c | 35 ++++++++++++++++++++++++++++++-----
3 files changed, 36 insertions(+), 5 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index eaf57b5f3c4b..9ad502f92529 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -168,6 +168,7 @@ struct f2fs_mount_info {
#define F2FS_FEATURE_SB_CHKSUM 0x0800
#define F2FS_FEATURE_CASEFOLD 0x1000
#define F2FS_FEATURE_COMPRESSION 0x2000
+#define F2FS_FEATURE_RO 0x4000
#define __F2FS_HAS_FEATURE(raw_super, mask) \
((raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -940,6 +941,7 @@ static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
#define NR_CURSEG_DATA_TYPE (3)
#define NR_CURSEG_NODE_TYPE (3)
#define NR_CURSEG_INMEM_TYPE (2)
+#define NR_CURSEG_RO_TYPE (2)
#define NR_CURSEG_PERSIST_TYPE (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
#define NR_CURSEG_TYPE (NR_CURSEG_INMEM_TYPE + NR_CURSEG_PERSIST_TYPE)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8668df7870d0..02e0c38be7eb 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4683,6 +4683,10 @@ static int sanity_check_curseg(struct f2fs_sb_info *sbi)
struct seg_entry *se = get_seg_entry(sbi, curseg->segno);
unsigned int blkofs = curseg->next_blkoff;
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO) &&
+ i != CURSEG_HOT_DATA && i != CURSEG_HOT_NODE)
+ continue;
+
sanity_check_seg_type(sbi, curseg->seg_type);
if (f2fs_test_bit(blkofs, se->cur_valid_map))
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index e70aca8f97bd..7769ed789b38 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1162,6 +1162,12 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
*/
if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
+
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO) && !f2fs_readonly(sbi->sb)) {
+ f2fs_info(sbi, "Allow to mount readonly mode only");
+ err = -EINVAL;
+ goto free_options;
+ }
return 0;
}
@@ -1819,7 +1825,11 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
static void default_options(struct f2fs_sb_info *sbi)
{
/* init some FS parameters */
- F2FS_OPTION(sbi).active_logs = NR_CURSEG_PERSIST_TYPE;
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO))
+ F2FS_OPTION(sbi).active_logs = NR_CURSEG_RO_TYPE;
+ else
+ F2FS_OPTION(sbi).active_logs = NR_CURSEG_PERSIST_TYPE;
+
F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
@@ -2001,6 +2011,11 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
goto skip;
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO) && !(*flags & SB_RDONLY)) {
+ err = -EROFS;
+ goto restore_opts;
+ }
+
#ifdef CONFIG_QUOTA
if (!f2fs_readonly(sb) && (*flags & SB_RDONLY)) {
err = dquot_suspend(sb, -1);
@@ -3134,14 +3149,15 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
- if (unlikely(fsmeta < F2FS_MIN_META_SEGMENTS ||
+ if (!F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO) &&
+ unlikely(fsmeta < F2FS_MIN_META_SEGMENTS ||
ovp_segments == 0 || reserved_segments == 0)) {
f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
return 1;
}
-
user_block_count = le64_to_cpu(ckpt->user_block_count);
- segment_count_main = le32_to_cpu(raw_super->segment_count_main);
+ segment_count_main = le32_to_cpu(raw_super->segment_count_main) +
+ F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO) ? 1 : 0;
log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
if (!user_block_count || user_block_count >=
segment_count_main << log_blocks_per_seg) {
@@ -3172,6 +3188,10 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
return 1;
+
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO))
+ goto check_data;
+
for (j = i + 1; j < NR_CURSEG_NODE_TYPE; j++) {
if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
le32_to_cpu(ckpt->cur_node_segno[j])) {
@@ -3182,10 +3202,15 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
}
}
}
+check_data:
for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
return 1;
+
+ if (F2FS_HAS_FEATURE(sbi, F2FS_FEATURE_RO))
+ goto skip_cross;
+
for (j = i + 1; j < NR_CURSEG_DATA_TYPE; j++) {
if (le32_to_cpu(ckpt->cur_data_segno[i]) ==
le32_to_cpu(ckpt->cur_data_segno[j])) {
@@ -3207,7 +3232,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
}
}
}
-
+skip_cross:
sit_bitmap_size = le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
nat_bitmap_size = le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
--
2.32.0.rc0.204.g9fa02ecfa5-goog
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