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authorHyeongseok Kim <hyeongseok@gmail.com>2021-03-04 03:20:35 +0300
committerNamjae Jeon <namjae.jeon@samsung.com>2021-04-27 14:45:06 +0300
commit654762df2ec7d61b05acc788afbffaba52d658fe (patch)
treecd003a28a9c79d4bab576e743fc1dea11467ff0b /fs/exfat/balloc.c
parent5c2d728507299f84631ab8020d6f0f98f2cb8fc2 (diff)
downloadlinux-654762df2ec7d61b05acc788afbffaba52d658fe.tar.xz
exfat: add support ioctl and FITRIM function
Add FITRIM ioctl to enable discarding unused blocks while mounted. As current exFAT doesn't have generic ioctl handler, add empty ioctl function first, and add FITRIM handler. Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Diffstat (limited to 'fs/exfat/balloc.c')
-rw-r--r--fs/exfat/balloc.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/fs/exfat/balloc.c b/fs/exfat/balloc.c
index 411fb0a8da10..78bc87d5a11b 100644
--- a/fs/exfat/balloc.c
+++ b/fs/exfat/balloc.c
@@ -264,3 +264,83 @@ int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count)
*ret_count = count;
return 0;
}
+
+int exfat_trim_fs(struct inode *inode, struct fstrim_range *range)
+{
+ unsigned int trim_begin, trim_end, count, next_free_clu;
+ u64 clu_start, clu_end, trim_minlen, trimmed_total = 0;
+ struct super_block *sb = inode->i_sb;
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ int err = 0;
+
+ clu_start = max_t(u64, range->start >> sbi->cluster_size_bits,
+ EXFAT_FIRST_CLUSTER);
+ clu_end = clu_start + (range->len >> sbi->cluster_size_bits) - 1;
+ trim_minlen = range->minlen >> sbi->cluster_size_bits;
+
+ if (clu_start >= sbi->num_clusters || range->len < sbi->cluster_size)
+ return -EINVAL;
+
+ if (clu_end >= sbi->num_clusters)
+ clu_end = sbi->num_clusters - 1;
+
+ mutex_lock(&sbi->bitmap_lock);
+
+ trim_begin = trim_end = exfat_find_free_bitmap(sb, clu_start);
+ if (trim_begin == EXFAT_EOF_CLUSTER)
+ goto unlock;
+
+ next_free_clu = exfat_find_free_bitmap(sb, trim_end + 1);
+ if (next_free_clu == EXFAT_EOF_CLUSTER)
+ goto unlock;
+
+ do {
+ if (next_free_clu == trim_end + 1) {
+ /* extend trim range for continuous free cluster */
+ trim_end++;
+ } else {
+ /* trim current range if it's larger than trim_minlen */
+ count = trim_end - trim_begin + 1;
+ if (count >= trim_minlen) {
+ err = sb_issue_discard(sb,
+ exfat_cluster_to_sector(sbi, trim_begin),
+ count * sbi->sect_per_clus, GFP_NOFS, 0);
+ if (err)
+ goto unlock;
+
+ trimmed_total += count;
+ }
+
+ /* set next start point of the free hole */
+ trim_begin = trim_end = next_free_clu;
+ }
+
+ if (next_free_clu >= clu_end)
+ break;
+
+ if (fatal_signal_pending(current)) {
+ err = -ERESTARTSYS;
+ goto unlock;
+ }
+
+ next_free_clu = exfat_find_free_bitmap(sb, next_free_clu + 1);
+ } while (next_free_clu != EXFAT_EOF_CLUSTER &&
+ next_free_clu > trim_end);
+
+ /* try to trim remainder */
+ count = trim_end - trim_begin + 1;
+ if (count >= trim_minlen) {
+ err = sb_issue_discard(sb, exfat_cluster_to_sector(sbi, trim_begin),
+ count * sbi->sect_per_clus, GFP_NOFS, 0);
+ if (err)
+ goto unlock;
+
+ trimmed_total += count;
+ }
+
+unlock:
+ mutex_unlock(&sbi->bitmap_lock);
+ range->len = trimmed_total << sbi->cluster_size_bits;
+
+ return err;
+}