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f2fs: fix to reclaim space in f2fs_allocate_pinning_section()

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It needs to trigger checkpoint to free space reclaimed by f2fs_gc_range(),
otherwise, fallocate() on pinfile will fail easily even there is slash
space in conventional zone.

[Testcase]
nullblk_create.sh 512 2 1024 1024
mkfs.f2fs /dev/nullb0 -f -m
mount /dev/nullb0 /mnt/f2fs/
touch /mnt/f2fs/pinfile
f2fs_io pinfile set /mnt/f2fs/pinfile
mkdir /mnt/f2fs/dir/
for((i=0;i<3934;i++)) do { dd if=/dev/zero of=/mnt/f2fs/dir/$i bs=1M count=1;} done
sync
for((i=0;i<3934;i+=2)) do { rm /mnt/f2fs/dir/$i;} done
for((i=0;i<1950;i++)) do { rm /mnt/f2fs/dir/$i;} done
sync
f2fs_io fallocate 0 0 $((1024*1024*1024)) /mnt/f2fs/pinfile
sync
stat /mnt/f2fs/pinfile
f2fs_io fiemap 0 $((1024*1024*1024)) /mnt/f2fs/pinfile

[Before]
fallocate failed: Resource temporarily unavailable
  File: /mnt/f2fs/pinfile
  Size: 109051904       Blocks: 213208     IO Block: 4096   regular file
Device: 250,0   Inode: 4           Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2026-08-12 20:04:02.264000000 +0800
Modify: 2026-08-12 20:04:26.784000000 +0800
Change: 2026-08-12 20:04:26.784000000 +0800
 Birth: -
root@localhost:~#
root@localhost:~#
root@localhost:~#
root@localhost:~# f2fs_io fiemap 0 $((1024*1024*1024)) /mnt/f2fs/pinfile
Fiemap: offset = 0 len = 1073741824
        logical addr.    physical addr.   length           flags
0       0000000000000000 0000000002e00000 0000000000200000 00001000
1       0000000000200000 000000002dc00000 0000000000400000 00001000
2       0000000000600000 000000002e400000 0000000000600000 00001000
3       0000000000c00000 000000007a400000 0000000005c00000 00001001

[After]
  File: /mnt/f2fs/pinfile
  Size: 1073741824      Blocks: 2099216    IO Block: 4096   regular file
Device: 250,0   Inode: 4           Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2026-08-12 19:47:49.428000000 +0800
Modify: 2026-08-12 19:49:06.808000000 +0800
Change: 2026-08-12 19:49:06.808000000 +0800
 Birth: -
Fiemap: offset = 0 len = 1073741824
        logical addr.    physical addr.   length           flags
0       0000000000000000 0000000002e00000 0000000000200000 00001000
1       0000000000200000 000000003aa00000 0000000000400000 00001000
2       0000000000600000 000000003b400000 0000000000200000 00001000
3       0000000000800000 000000007a200000 0000000005e00000 00001000
4       0000000006600000 0000000002800000 0000000000200000 00001000
5       0000000006800000 0000000003200000 0000000000400000 00001000
6       0000000006c00000 0000000003000000 0000000000200000 00001000
7       0000000006e00000 0000000003600000 0000000037200000 00001000
8       000000003e000000 000000003b200000 0000000000200000 00001000
9       000000003e200000 000000003a800000 0000000000200000 00001000
10      000000003e400000 000000003ae00000 0000000000400000 00001000
11      000000003e800000 000000003b600000 0000000001800000 00001001

Cc: stable@kernel.org
Fixes: 9703d69d9d ("f2fs: support file pinning for zoned devices")
Cc: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2026-08-12 12:17:54 +00:00 • committed by Jaegeuk Kim
commit fa487f56ef
1 changed files with 6 additions and 3 deletions
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