diff options
Diffstat (limited to 'fs/exfat/balloc.c')
-rw-r--r-- | fs/exfat/balloc.c | 80 |
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; +} |