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ext4: add new helper interface ext4_try_to_trim_range()
There is no functional change in this patch but just split the codes, which serachs free block and does trim, into a new function ext4_try_to_trim_range. This is preparing for the following async backgroup discard. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20210724074124.25731-3-jianchao.wan9@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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1 changed files with 57 additions and 45 deletions
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@ -6218,6 +6218,54 @@ __acquires(bitlock)
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return ret;
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}
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static int ext4_try_to_trim_range(struct super_block *sb,
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struct ext4_buddy *e4b, ext4_grpblk_t start,
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ext4_grpblk_t max, ext4_grpblk_t minblocks)
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{
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ext4_grpblk_t next, count, free_count;
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void *bitmap;
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int ret = 0;
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bitmap = e4b->bd_bitmap;
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start = (e4b->bd_info->bb_first_free > start) ?
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e4b->bd_info->bb_first_free : start;
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count = 0;
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free_count = 0;
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while (start <= max) {
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start = mb_find_next_zero_bit(bitmap, max + 1, start);
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if (start > max)
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break;
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next = mb_find_next_bit(bitmap, max + 1, start);
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if ((next - start) >= minblocks) {
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ret = ext4_trim_extent(sb, start, next - start, e4b);
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if (ret && ret != -EOPNOTSUPP)
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break;
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ret = 0;
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count += next - start;
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}
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free_count += next - start;
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start = next + 1;
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if (fatal_signal_pending(current)) {
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count = -ERESTARTSYS;
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break;
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}
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if (need_resched()) {
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ext4_unlock_group(sb, e4b->bd_group);
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cond_resched();
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ext4_lock_group(sb, e4b->bd_group);
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}
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if ((e4b->bd_info->bb_free - free_count) < minblocks)
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break;
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}
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return count;
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}
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/**
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* ext4_trim_all_free -- function to trim all free space in alloc. group
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* @sb: super block for file system
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@ -6241,10 +6289,8 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
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ext4_grpblk_t start, ext4_grpblk_t max,
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ext4_grpblk_t minblocks)
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{
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void *bitmap;
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ext4_grpblk_t next, count = 0, free_count = 0;
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struct ext4_buddy e4b;
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int ret = 0;
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int ret;
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trace_ext4_trim_all_free(sb, group, start, max);
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@ -6254,57 +6300,23 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
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ret, group);
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return ret;
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}
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bitmap = e4b.bd_bitmap;
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ext4_lock_group(sb, group);
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if (EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) &&
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minblocks >= atomic_read(&EXT4_SB(sb)->s_last_trim_minblks))
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goto out;
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start = (e4b.bd_info->bb_first_free > start) ?
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e4b.bd_info->bb_first_free : start;
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while (start <= max) {
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start = mb_find_next_zero_bit(bitmap, max + 1, start);
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if (start > max)
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break;
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next = mb_find_next_bit(bitmap, max + 1, start);
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if ((next - start) >= minblocks) {
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ret = ext4_trim_extent(sb, start, next - start, &e4b);
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if (ret && ret != -EOPNOTSUPP)
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break;
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ret = 0;
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count += next - start;
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}
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free_count += next - start;
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start = next + 1;
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if (fatal_signal_pending(current)) {
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count = -ERESTARTSYS;
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break;
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}
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if (need_resched()) {
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ext4_unlock_group(sb, group);
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cond_resched();
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ext4_lock_group(sb, group);
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}
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if ((e4b.bd_info->bb_free - free_count) < minblocks)
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break;
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if (!EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) ||
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minblocks < atomic_read(&EXT4_SB(sb)->s_last_trim_minblks)) {
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ret = ext4_try_to_trim_range(sb, &e4b, start, max, minblocks);
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if (ret >= 0)
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EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info);
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} else {
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ret = 0;
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}
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if (!ret) {
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ret = count;
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EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info);
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}
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out:
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ext4_unlock_group(sb, group);
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ext4_mb_unload_buddy(&e4b);
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ext4_debug("trimmed %d blocks in the group %d\n",
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count, group);
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ret, group);
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return ret;
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}
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