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f2fs-tools: give less overprovisioning space

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As f2fs becomes more resilient for GCs, let's give the marginal overprovision
space back to user.

Fix an issue where reserved_space > ovp_space, reported by Shinichiro.

Signed-off-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2022-10-10 14:02:22 -07:00 committed by sunshenshen
parent 2f3589348f
commit 76a88baa90
3 changed files with 20 additions and 7 deletions
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12
fsck/resize.c
View File

@ -150,7 +150,7 @@ safe_resize:
c.new_overprovision = get_best_overprovision(sb);
c.new_reserved_segments =
(2 * (100 / c.new_overprovision + 1) + 6) *
(100 / c.new_overprovision + 1 + NR_CURSEG_TYPE) *
get_sb(segs_per_sec);
if ((get_sb(segment_count_main) - 2) < c.new_reserved_segments ||
@ -475,8 +475,13 @@ static void rebuild_checkpoint(struct f2fs_sb_info *sbi,
set_cp(overprov_segment_count, (get_newsb(segment_count_main) -
get_cp(rsvd_segment_count)) *
c.new_overprovision / 100);
/* give 2 sections (DATA and NODE) to trigger GC in advance */
if (get_cp(overprov_segment_count) < get_cp(rsvd_segment_count))
set_cp(overprov_segment_count, get_cp(rsvd_segment_count));
set_cp(overprov_segment_count, get_cp(overprov_segment_count) +
get_cp(rsvd_segment_count));
2 * get_sb(segs_per_sec));
DBG(0, "Info: Overprovision ratio = %.3lf%%\n", c.new_overprovision);
DBG(0, "Info: Overprovision segments = %u (GC reserved = %u)\n",
@ -607,7 +612,8 @@ static int f2fs_resize_check(struct f2fs_sb_info *sbi, struct f2fs_super_block *
overprov_segment_count = (get_newsb(segment_count_main) -
c.new_reserved_segments) *
c.new_overprovision / 100;
overprov_segment_count += c.new_reserved_segments;
overprov_segment_count += 2 * get_newsb(segs_per_sec);
user_block_count = (get_newsb(segment_count_main) -
overprov_segment_count) * c.blks_per_seg;

7
include/f2fs_fs.h
View File

@ -1631,10 +1631,13 @@ static inline double get_best_overprovision(struct f2fs_super_block *sb)
}
for (; candidate <= end; candidate += diff) {
reserved = (2 * (100 / candidate + 1) + 6) *
reserved = (100 / candidate + 1 + NR_CURSEG_TYPE) *
round_up(usable_main_segs, get_sb(section_count));
ovp = (usable_main_segs - reserved) * candidate / 100;
space = usable_main_segs - reserved - ovp;
if (ovp < 0)
continue;
space = usable_main_segs - max(reserved, ovp) -
2 * get_sb(segs_per_sec);
if (max_space < space) {
max_space = space;
max_ovp = candidate;

8
mkfs/f2fs_format.c
View File

@ -486,7 +486,7 @@ static int f2fs_prepare_super_block(void)
c.overprovision = get_best_overprovision(sb);
c.reserved_segments =
(2 * (100 / c.overprovision + 1) + NR_CURSEG_TYPE) *
(100 / c.overprovision + 1 + NR_CURSEG_TYPE) *
round_up(f2fs_get_usable_segments(sb), get_sb(section_count));
if (c.feature & cpu_to_le32(F2FS_FEATURE_RO)) {
@ -766,8 +766,12 @@ static int f2fs_write_check_point_pack(void)
set_cp(overprov_segment_count, (f2fs_get_usable_segments(sb) -
get_cp(rsvd_segment_count)) *
c.overprovision / 100);
if (get_cp(overprov_segment_count) < get_cp(rsvd_segment_count))
set_cp(overprov_segment_count, get_cp(rsvd_segment_count));
set_cp(overprov_segment_count, get_cp(overprov_segment_count) +
get_cp(rsvd_segment_count));
2 * get_sb(segs_per_sec));
if (f2fs_get_usable_segments(sb) <= get_cp(overprov_segment_count)) {
MSG(0, "\tError: Not enough segments to create F2FS Volume\n");