ext4: Refactor code in ext4_mb_normalize_request() and ext4_mb_use_preallocated()
Change some variable names to be more consistent and refactor some of the code to make it easier to read. There are no functional changes in this patch Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/8edcab489c06cf861b19d87207d9b0ff7ac7f3c1.1679731817.git.ojaswin@linux.ibm.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -3994,7 +3994,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
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loff_t orig_size __maybe_unused;
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ext4_lblk_t start;
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struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
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struct ext4_prealloc_space *pa;
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struct ext4_prealloc_space *tmp_pa;
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ext4_lblk_t tmp_pa_start, tmp_pa_end;
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/* do normalize only data requests, metadata requests
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do not need preallocation */
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@ -4097,54 +4098,52 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
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/* check we don't cross already preallocated blocks */
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rcu_read_lock();
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list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
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ext4_lblk_t pa_end;
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if (pa->pa_deleted)
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list_for_each_entry_rcu(tmp_pa, &ei->i_prealloc_list, pa_inode_list) {
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if (tmp_pa->pa_deleted)
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continue;
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spin_lock(&pa->pa_lock);
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if (pa->pa_deleted) {
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spin_unlock(&pa->pa_lock);
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spin_lock(&tmp_pa->pa_lock);
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if (tmp_pa->pa_deleted) {
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spin_unlock(&tmp_pa->pa_lock);
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continue;
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}
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pa_end = pa->pa_lstart + EXT4_C2B(sbi, pa->pa_len);
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tmp_pa_start = tmp_pa->pa_lstart;
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tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len);
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/* PA must not overlap original request */
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BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end ||
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ac->ac_o_ex.fe_logical < pa->pa_lstart));
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BUG_ON(!(ac->ac_o_ex.fe_logical >= tmp_pa_end ||
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ac->ac_o_ex.fe_logical < tmp_pa_start));
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/* skip PAs this normalized request doesn't overlap with */
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if (pa->pa_lstart >= end || pa_end <= start) {
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spin_unlock(&pa->pa_lock);
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if (tmp_pa_start >= end || tmp_pa_end <= start) {
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spin_unlock(&tmp_pa->pa_lock);
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continue;
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}
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BUG_ON(pa->pa_lstart <= start && pa_end >= end);
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BUG_ON(tmp_pa_start <= start && tmp_pa_end >= end);
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/* adjust start or end to be adjacent to this pa */
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if (pa_end <= ac->ac_o_ex.fe_logical) {
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BUG_ON(pa_end < start);
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start = pa_end;
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} else if (pa->pa_lstart > ac->ac_o_ex.fe_logical) {
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BUG_ON(pa->pa_lstart > end);
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end = pa->pa_lstart;
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if (tmp_pa_end <= ac->ac_o_ex.fe_logical) {
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BUG_ON(tmp_pa_end < start);
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start = tmp_pa_end;
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} else if (tmp_pa_start > ac->ac_o_ex.fe_logical) {
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BUG_ON(tmp_pa_start > end);
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end = tmp_pa_start;
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}
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spin_unlock(&pa->pa_lock);
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spin_unlock(&tmp_pa->pa_lock);
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}
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rcu_read_unlock();
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size = end - start;
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/* XXX: extra loop to check we really don't overlap preallocations */
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rcu_read_lock();
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list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
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ext4_lblk_t pa_end;
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spin_lock(&pa->pa_lock);
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if (pa->pa_deleted == 0) {
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pa_end = pa->pa_lstart + EXT4_C2B(sbi, pa->pa_len);
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BUG_ON(!(start >= pa_end || end <= pa->pa_lstart));
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list_for_each_entry_rcu(tmp_pa, &ei->i_prealloc_list, pa_inode_list) {
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spin_lock(&tmp_pa->pa_lock);
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if (tmp_pa->pa_deleted == 0) {
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tmp_pa_start = tmp_pa->pa_lstart;
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tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len);
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BUG_ON(!(start >= tmp_pa_end || end <= tmp_pa_start));
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}
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spin_unlock(&pa->pa_lock);
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spin_unlock(&tmp_pa->pa_lock);
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}
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rcu_read_unlock();
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@ -4359,7 +4358,8 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
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int order, i;
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struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
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struct ext4_locality_group *lg;
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struct ext4_prealloc_space *pa, *cpa = NULL;
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struct ext4_prealloc_space *tmp_pa, *cpa = NULL;
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ext4_lblk_t tmp_pa_start, tmp_pa_end;
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ext4_fsblk_t goal_block;
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/* only data can be preallocated */
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@ -4368,18 +4368,20 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
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/* first, try per-file preallocation */
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rcu_read_lock();
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list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
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list_for_each_entry_rcu(tmp_pa, &ei->i_prealloc_list, pa_inode_list) {
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/* all fields in this condition don't change,
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* so we can skip locking for them */
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if (ac->ac_o_ex.fe_logical < pa->pa_lstart ||
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ac->ac_o_ex.fe_logical >= (pa->pa_lstart +
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EXT4_C2B(sbi, pa->pa_len)))
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tmp_pa_start = tmp_pa->pa_lstart;
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tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len);
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if (ac->ac_o_ex.fe_logical < tmp_pa_start ||
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ac->ac_o_ex.fe_logical >= tmp_pa_end)
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continue;
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/* non-extent files can't have physical blocks past 2^32 */
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if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) &&
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(pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len) >
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(tmp_pa->pa_pstart + EXT4_C2B(sbi, tmp_pa->pa_len) >
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EXT4_MAX_BLOCK_FILE_PHYS)) {
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/*
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* Since PAs don't overlap, we won't find any
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@ -4389,16 +4391,16 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
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}
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/* found preallocated blocks, use them */
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spin_lock(&pa->pa_lock);
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if (pa->pa_deleted == 0 && pa->pa_free) {
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atomic_inc(&pa->pa_count);
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ext4_mb_use_inode_pa(ac, pa);
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spin_unlock(&pa->pa_lock);
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spin_lock(&tmp_pa->pa_lock);
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if (tmp_pa->pa_deleted == 0 && tmp_pa->pa_free) {
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atomic_inc(&tmp_pa->pa_count);
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ext4_mb_use_inode_pa(ac, tmp_pa);
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spin_unlock(&tmp_pa->pa_lock);
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ac->ac_criteria = 10;
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rcu_read_unlock();
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return true;
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}
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spin_unlock(&pa->pa_lock);
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spin_unlock(&tmp_pa->pa_lock);
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}
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rcu_read_unlock();
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@ -4422,16 +4424,16 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
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*/
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for (i = order; i < PREALLOC_TB_SIZE; i++) {
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rcu_read_lock();
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list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[i],
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list_for_each_entry_rcu(tmp_pa, &lg->lg_prealloc_list[i],
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pa_inode_list) {
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spin_lock(&pa->pa_lock);
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if (pa->pa_deleted == 0 &&
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pa->pa_free >= ac->ac_o_ex.fe_len) {
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spin_lock(&tmp_pa->pa_lock);
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if (tmp_pa->pa_deleted == 0 &&
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tmp_pa->pa_free >= ac->ac_o_ex.fe_len) {
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cpa = ext4_mb_check_group_pa(goal_block,
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pa, cpa);
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tmp_pa, cpa);
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}
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spin_unlock(&pa->pa_lock);
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spin_unlock(&tmp_pa->pa_lock);
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}
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rcu_read_unlock();
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}
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