diff -drupN a/fs/fat/fatent.c b/fs/fat/fatent.c
--- a/fs/fat/fatent.c	2018-08-06 17:23:04.000000000 +0300
+++ b/fs/fat/fatent.c	2022-06-12 05:28:14.000000000 +0300
@@ -380,6 +380,9 @@ static int fat_mirror_bhs(struct super_b
 	int err, n, copy;
 
 	err = 0;
+#ifdef CONFIG_FAT1_UPDATE_ONLY
+	return 0;
+#endif
 	for (copy = 1; copy < sbi->fats; copy++) {
 		sector_t backup_fat = sbi->fat_length * copy;
 
@@ -458,6 +461,51 @@ static void fat_collect_bhs(struct buffe
 		}
 	}
 }
+#ifdef CONFIG_PRELLOCATE_FLAG
+int fat_caculate_cluster(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	const struct fatent_operations *ops = sbi->fatent_ops;
+	struct fat_entry fatent;
+	unsigned int nr_cluster = 0;
+	int err = 0, cluster = 0;
+	fatent_init(&fatent);
+	fatent_set_entry(&fatent, MSDOS_I(inode)->i_start);
+	err = fat_ent_read_block(sb, &fatent);
+	if (err)
+		goto error;
+
+	while (ops->ent_get(&fatent) != FAT_ENT_EOF) {
+		cluster = ops->ent_get(&fatent);
+		if (cluster < 0) {
+			err = cluster;
+			pr_err("FAT ERR: %s: invalid FAT entry value",
+					__func__);
+			goto error;
+		} else if (cluster == FAT_ENT_FREE) {
+			pr_err("FAT ERR: %s: deleting FAT entry beyond EOF",
+					__func__);
+			err = -EIO;
+			goto error;
+		}
+		nr_cluster++;
+		fatent_set_entry(&fatent, cluster);
+		err = fat_ent_read_block(sb, &fatent);
+		if (err)
+			goto error;
+	}
+error:
+	fatent_brelse(&fatent);
+	if (err)
+		return err;
+
+	if (nr_cluster)
+		return nr_cluster + 1;
+	else
+		return 0;
+}
+#endif
 
 int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 {
@@ -468,6 +516,8 @@ int fat_alloc_clusters(struct inode *ino
 	struct buffer_head *bhs[MAX_BUF_PER_PAGE];
 	int i, count, err, nr_bhs, idx_clus;
 
+	if (nr_cluster > (MAX_BUF_PER_PAGE / 2))
+		printk("nr_cluster %d,max nr_cluster %lu\n", nr_cluster, (MAX_BUF_PER_PAGE / 2));
 	BUG_ON(nr_cluster > (MAX_BUF_PER_PAGE / 2));	/* fixed limit */
 
 	lock_fat(sbi);
@@ -547,6 +597,57 @@ out:
 	return err;
 }
 
+#ifdef CONFIG_TRUNCATE_NOMEM_RECLAIM_DISCARD
+int fat_discard_clusters(struct inode *inode, int cluster)
+{
+	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	struct fat_entry fatent;
+	int  err;
+	int first_cl = cluster;
+
+	fatent_init(&fatent);
+	lock_fat(sbi);
+	do {
+		cluster = fat_ent_read(inode, &fatent, cluster);
+		if (cluster < 0) {
+			err = cluster;
+			goto error;
+		} else if (cluster == FAT_ENT_FREE) {
+			fat_fs_error(sb, "%s: deleting FAT entry beyond EOF",
+				     __func__);
+			err = -EIO;
+			goto error;
+		}
+
+		if (sbi->options.discard) {
+			/*
+			 * Issue discard for the sectors we no longer
+			 * care about, batching contiguous clusters
+			 * into one request
+			 */
+			if (cluster != fatent.entry + 1) {
+				int nr_clus = fatent.entry - first_cl + 1;
+
+				sb_issue_discard(sb,
+					fat_clus_to_blknr(sbi, first_cl),
+					nr_clus * sbi->sec_per_clus,
+					GFP_NOFS, 0);
+
+				first_cl = cluster;
+			}
+		}
+
+	} while (cluster != FAT_ENT_EOF);
+error:
+	fatent_brelse(&fatent);
+	unlock_fat(sbi);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(fat_discard_clusters);
+#endif
+
 int fat_free_clusters(struct inode *inode, int cluster)
 {
 	struct super_block *sb = inode->i_sb;
@@ -690,3 +791,104 @@ out:
 	unlock_fat(sbi);
 	return err;
 }
+
+static int fat_trim_clusters(struct super_block *sb, u32 clus, u32 nr_clus)
+{
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	return sb_issue_discard(sb, fat_clus_to_blknr(sbi, clus),
+				nr_clus * sbi->sec_per_clus, GFP_NOFS, 0);
+}
+
+int fat_trim_fs(struct inode *inode, struct fstrim_range *range)
+{
+	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	const struct fatent_operations *ops = sbi->fatent_ops;
+	struct fat_entry fatent;
+	u64 ent_start, ent_end, minlen, trimmed = 0;
+	u32 free = 0;
+	unsigned long reada_blocks, reada_mask, cur_block = 0;
+	int err = 0;
+
+	/*
+	 * FAT data is organized as clusters, trim at the granulary of cluster.
+	 *
+	 * fstrim_range is in byte, convert vaules to cluster index.
+	 * Treat sectors before data region as all used, not to trim them.
+	 */
+	ent_start = max_t(u64, range->start>>sbi->cluster_bits, FAT_START_ENT);
+	ent_end = ent_start + (range->len >> sbi->cluster_bits) - 1;
+	minlen = range->minlen >> sbi->cluster_bits;
+
+	if (ent_start >= sbi->max_cluster || range->len < sbi->cluster_size)
+		return -EINVAL;
+	if (ent_end >= sbi->max_cluster)
+		ent_end = sbi->max_cluster - 1;
+
+	reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
+	reada_mask = reada_blocks - 1;
+
+	fatent_init(&fatent);
+	lock_fat(sbi);
+	fatent_set_entry(&fatent, ent_start);
+	while (fatent.entry <= ent_end) {
+		/* readahead of fat blocks */
+		if ((cur_block & reada_mask) == 0) {
+			unsigned long rest = sbi->fat_length - cur_block;
+			fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
+		}
+		cur_block++;
+
+		err = fat_ent_read_block(sb, &fatent);
+		if (err)
+			goto error;
+		do {
+			if (ops->ent_get(&fatent) == FAT_ENT_FREE) {
+				free++;
+			} else if (free) {
+				if (free >= minlen) {
+					u32 clus = fatent.entry - free;
+
+					err = fat_trim_clusters(sb, clus, free);
+					if (err && err != -EOPNOTSUPP)
+						goto error;
+					if (!err)
+						trimmed += free;
+					err = 0;
+				}
+				free = 0;
+			}
+		} while (fat_ent_next(sbi, &fatent) && fatent.entry <= ent_end);
+
+		if (fatal_signal_pending(current)) {
+			err = -ERESTARTSYS;
+			goto error;
+		}
+
+		if (need_resched()) {
+			fatent_brelse(&fatent);
+			unlock_fat(sbi);
+			cond_resched();
+			lock_fat(sbi);
+		}
+	}
+	/* handle scenario when tail entries are all free */
+	if (free && free >= minlen) {
+		u32 clus = fatent.entry - free;
+
+		err = fat_trim_clusters(sb, clus, free);
+		if (err && err != -EOPNOTSUPP)
+			goto error;
+		if (!err)
+			trimmed += free;
+		err = 0;
+	}
+
+error:
+	fatent_brelse(&fatent);
+	unlock_fat(sbi);
+
+	range->len = trimmed << sbi->cluster_bits;
+
+	return err;
+}