f2fs: decrease spare area for pinned files for zoned devices

Now we reclaim too much space before allocating pinned space for zoned
devices.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Daeho Jeong

fs/f2fs/file.c

@@ -1790,7 +1790,8 @@ static int f2fs_expand_inode_data(struct inode *inode, loff_t offset,
 
 		map.m_len = sec_blks;
 next_alloc:
-		if (has_not_enough_free_secs(sbi, 0,
+		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)))) {
 			f2fs_down_write(&sbi->gc_lock);
 			stat_inc_gc_call_count(sbi, FOREGROUND);

fs/f2fs/gc.h

@@ -35,6 +35,7 @@
 #define LIMIT_BOOST_ZONED_GC	25 /* percentage over total user space of boosted gc for zoned devices */
 #define DEF_MIGRATION_WINDOW_GRANULARITY_ZONED	3
 #define BOOST_GC_MULTIPLE	5
+#define ZONED_PIN_SEC_REQUIRED_COUNT	1
 
 #define DEF_GC_FAILED_PINNED_FILES	2048
 #define MAX_GC_FAILED_PINNED_FILES	USHRT_MAX

fs/f2fs/segment.c

@@ -3237,7 +3237,8 @@ int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi)
 
 	if (f2fs_sb_has_blkzoned(sbi) && err == -EAGAIN && gc_required) {
 		f2fs_down_write(&sbi->gc_lock);
-		err = f2fs_gc_range(sbi, 0, GET_SEGNO(sbi, FDEV(0).end_blk), true, 1);
+		err = f2fs_gc_range(sbi, 0, GET_SEGNO(sbi, FDEV(0).end_blk),
+				true, ZONED_PIN_SEC_REQUIRED_COUNT);
 		f2fs_up_write(&sbi->gc_lock);
 
 		gc_required = false;