This patch introduces /sys/fs/f2fs/<dev>/reserved_pin_section for tuning
@needed parameter of has_not_enough_free_secs(), if we configure it w/
zero, it can avoid f2fs_gc() as much as possible while fallocating on
pinned file.
Signed-off-by: Chao Yu <c...@kernel.org>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 9 +++++++++
fs/f2fs/f2fs.h | 3 +++
fs/f2fs/file.c | 5 ++---
fs/f2fs/super.c | 3 +++
fs/f2fs/sysfs.c | 9 +++++++++
5 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
b/Documentation/ABI/testing/sysfs-fs-f2fs
index bf03263b9f46..c2a233f2a085 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -861,3 +861,12 @@ Description: This is a read-only entry to show the
value of sb.s_encoding_flags,
SB_ENC_STRICT_MODE_FL 0x00000001
SB_ENC_NO_COMPAT_FALLBACK_FL 0x00000002
============================ ==========
+
+What: /sys/fs/f2fs/<disk>/reserved_pin_section
+Date: June 2025
+Contact: "Chao Yu" <c...@kernel.org>
+Description: This threshold is used to control triggering garbage collection
while
+ fallocating on pinned file, so, it can guarantee there is
enough free
+ reserved section before preallocating on pinned file.
+ By default, the value is ovp_sections, especially, for zoned
ufs, the
+ value is 1.
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9333a22b9a01..fa27498202a3 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1724,6 +1724,9 @@ struct f2fs_sb_info {
/* for skip statistic */
unsigned long long skipped_gc_rwsem; /* FG_GC only */
+ /* free sections reserved for pinned file */
+ unsigned int reserved_pin_section;
+
/* threshold for gc trials on pinned files */
unsigned short gc_pin_file_threshold;
struct f2fs_rwsem pin_sem;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 696131e655ed..a909f79db178 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1887,9 +1887,8 @@ static int f2fs_expand_inode_data(struct inode *inode,
loff_t offset,
}
}
- if (has_not_enough_free_secs(sbi, 0, f2fs_sb_has_blkzoned(sbi) ?
- ZONED_PIN_SEC_REQUIRED_COUNT :
- GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
+ if (has_not_enough_free_secs(sbi, 0,
+ sbi->reserved_pin_section)) {
f2fs_down_write(&sbi->gc_lock);
stat_inc_gc_call_count(sbi, FOREGROUND);
err = f2fs_gc(sbi, &gc_control);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 57adeff5ef25..48b97a95fd63 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4975,6 +4975,9 @@ static int f2fs_fill_super(struct super_block *sb, struct
fs_context *fc)
sbi->last_valid_block_count = sbi->total_valid_block_count;
sbi->reserved_blocks = 0;
sbi->current_reserved_blocks = 0;
+ sbi->reserved_pin_section = f2fs_sb_has_blkzoned(sbi) ?
+ ZONED_PIN_SEC_REQUIRED_COUNT :
+ GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi));
limit_reserve_root(sbi);
adjust_unusable_cap_perc(sbi);
