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>
---
v2:
- assign SM_I(sbi)->ovp_segments after f2fs_build_segment_manager()
Documentation/ABI/testing/sysfs-fs-f2fs | 9 +++++++++
fs/f2fs/f2fs.h | 3 +++
fs/f2fs/file.c | 5 ++---
fs/f2fs/super.c | 4 ++++
fs/f2fs/sysfs.c | 9 +++++++++
5 files changed, 27 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..e0ecc341f1d3 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -5017,6 +5017,10 @@ static int f2fs_fill_super(struct super_block *sb,
struct fs_context *fc)
/* get segno of first zoned block device */
sbi->first_seq_zone_segno = get_first_seq_zone_segno(sbi);
+ sbi->reserved_pin_section = f2fs_sb_has_blkzoned(sbi) ?
+ ZONED_PIN_SEC_REQUIRED_COUNT :
+ GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi));
+
/* Read accumulated write IO statistics if exists */
seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
if (__exist_node_summaries(sbi))
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 75134d69a0bd..51be7ffb38c5 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -824,6 +824,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}
+ if (!strcmp(a->attr.name, "reserved_pin_section")) {
+ if (t > GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))
+ return -EINVAL;
+ *ui = (unsigned int)t;
+ return count;
+ }
+
*ui = (unsigned int)t;
return count;
@@ -1130,6 +1137,7 @@ F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec);
F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy);
#endif
F2FS_SBI_GENERAL_RW_ATTR(carve_out);
+F2FS_SBI_GENERAL_RW_ATTR(reserved_pin_section);
/* STAT_INFO ATTR */
#ifdef CONFIG_F2FS_STAT_FS
@@ -1323,6 +1331,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(last_age_weight),
ATTR_LIST(max_read_extent_count),
ATTR_LIST(carve_out),
+ ATTR_LIST(reserved_pin_section),
NULL,
};
ATTRIBUTE_GROUPS(f2fs);
--
2.40.1
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