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f2fs: control nat_bits feature via mount option

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Introduce a new mount option "nat_bits" to control nat_bits feature,
by default nat_bits feature is disabled.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2025-03-08 13:18:46 +08:00 committed by Jaegeuk Kim
parent 8a2d9f00d5
commit c2ecba0265
4 changed files with 21 additions and 0 deletions
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2
Documentation/filesystems/f2fs.rst
View File

@ -365,6 +365,8 @@ errors=%s Specify f2fs behavior on critical errors. This supports modes:
pending node write drop keep N/A
pending meta write keep keep N/A
====================== =============== =============== ========
nat_bits Enable nat_bits feature to enhance full/empty nat blocks access,
by default it's disabled.
======================== ============================================================
Debugfs Entries

1
fs/f2fs/f2fs.h
View File

@ -114,6 +114,7 @@ extern const char *f2fs_fault_name[FAULT_MAX];
#define F2FS_MOUNT_GC_MERGE 0x02000000
#define F2FS_MOUNT_COMPRESS_CACHE 0x04000000
#define F2FS_MOUNT_AGE_EXTENT_CACHE 0x08000000
#define F2FS_MOUNT_NAT_BITS 0x10000000
#define F2FS_OPTION(sbi) ((sbi)->mount_opt)
#define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)

3
fs/f2fs/node.c
View File

@ -3306,6 +3306,9 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
if (!nm_i->nat_bitmap)
return -ENOMEM;
if (!test_opt(sbi, NAT_BITS))
disable_nat_bits(sbi, true);
err = __get_nat_bitmaps(sbi);
if (err)
return err;

15
fs/f2fs/super.c
View File

@ -190,6 +190,7 @@ enum {
Opt_memory_mode,
Opt_age_extent_cache,
Opt_errors,
Opt_nat_bits,
Opt_err,
};
@ -269,6 +270,7 @@ static match_table_t f2fs_tokens = {
{Opt_memory_mode, "memory=%s"},
{Opt_age_extent_cache, "age_extent_cache"},
{Opt_errors, "errors=%s"},
{Opt_nat_bits, "nat_bits"},
{Opt_err, NULL},
};
@ -1322,6 +1324,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
}
kfree(name);
break;
case Opt_nat_bits:
set_opt(sbi, NAT_BITS);
break;
default:
f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
p);
@ -2135,6 +2140,9 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
else if (F2FS_OPTION(sbi).errors == MOUNT_ERRORS_PANIC)
seq_printf(seq, ",errors=%s", "panic");
if (test_opt(sbi, NAT_BITS))
seq_puts(seq, ",nat_bits");
return 0;
}
@ -2325,6 +2333,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
bool no_discard = !test_opt(sbi, DISCARD);
bool no_compress_cache = !test_opt(sbi, COMPRESS_CACHE);
bool block_unit_discard = f2fs_block_unit_discard(sbi);
bool no_nat_bits = !test_opt(sbi, NAT_BITS);
#ifdef CONFIG_QUOTA
int i, j;
#endif
@ -2453,6 +2462,12 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
goto restore_opts;
}
if (no_nat_bits == !!test_opt(sbi, NAT_BITS)) {
err = -EINVAL;
f2fs_warn(sbi, "switch nat_bits option is not allowed");
goto restore_opts;
}
if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
err = -EINVAL;
f2fs_warn(sbi, "disabling checkpoint not compatible with read-only");