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Commit d9f34504 authored by Theodore Ts'o's avatar Theodore Ts'o
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ext4: ignore errors when issuing discards 



This is an effective revert of commit a30eec2a: "ext4: stop issuing
discards if not supported by device".  The problem is that there are
some devices that may return errors in response to a discard request
some times but not others.  (One example would be a hybrid dm device
which concatenates an SSD and an HDD device).

By this logic, I also removed the error checking from ext4's FITRIM
code; so that an error from a discard will not stop the FITRIM from
trying to trim the rest of the file system.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 39db00f1

fs/ext4/mballoc.c

+9 −25
Original line number Diff line number Diff line
@@ -2661,7 +2661,7 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn) 
	struct super_block *sb = journal->j_private;

	struct ext4_buddy e4b;

	struct ext4_group_info *db;

	int err, ret, count = 0, count2 = 0;

	int err, count = 0, count2 = 0;

	struct ext4_free_data *entry;

	struct list_head *l, *ltmp;
@@ -2671,15 +2671,9 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn) 
		mb_debug(1, "gonna free %u blocks in group %u (0x%p):",

			 entry->count, entry->group, entry);



		if (test_opt(sb, DISCARD)) {

			ret = ext4_issue_discard(sb, entry->group,

		if (test_opt(sb, DISCARD))

			ext4_issue_discard(sb, entry->group,

					   entry->start_blk, entry->count);

			if (unlikely(ret == -EOPNOTSUPP)) {

				ext4_warning(sb, "discard not supported, "

						 "disabling");

				clear_opt(sb, DISCARD);

			}

		}



		err = ext4_mb_load_buddy(sb, entry->group, &e4b);

		/* we expect to find existing buddy because it's pinned */
@@ -4717,11 +4711,10 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode, 
 * one will allocate those blocks, mark it as used in buddy bitmap. This must

 * be called with under the group lock.

 */

static int ext4_trim_extent(struct super_block *sb, int start, int count,

static void ext4_trim_extent(struct super_block *sb, int start, int count,

			     ext4_group_t group, struct ext4_buddy *e4b)

{

	struct ext4_free_extent ex;

	int ret = 0;



	assert_spin_locked(ext4_group_lock_ptr(sb, group));
@@ -4735,12 +4728,9 @@ static int ext4_trim_extent(struct super_block *sb, int start, int count, 
	 */

	mb_mark_used(e4b, &ex);

	ext4_unlock_group(sb, group);



	ret = ext4_issue_discard(sb, group, start, count);



	ext4_issue_discard(sb, group, start, count);

	ext4_lock_group(sb, group);

	mb_free_blocks(NULL, e4b, start, ex.fe_len);

	return ret;

}



/**
@@ -4768,7 +4758,6 @@ ext4_trim_all_free(struct super_block *sb, struct ext4_buddy *e4b, 
	void *bitmap;

	ext4_grpblk_t next, count = 0;

	ext4_group_t group;

	int ret = 0;



	BUG_ON(e4b == NULL);
@@ -4785,10 +4774,8 @@ ext4_trim_all_free(struct super_block *sb, struct ext4_buddy *e4b, 
		next = mb_find_next_bit(bitmap, max, start);



		if ((next - start) >= minblocks) {

			ret = ext4_trim_extent(sb, start,

			ext4_trim_extent(sb, start,

					 next - start, group, e4b);

			if (ret < 0)

				break;

			count += next - start;

		}

		start = next + 1;
@@ -4812,9 +4799,6 @@ ext4_trim_all_free(struct super_block *sb, struct ext4_buddy *e4b, 
	ext4_debug("trimmed %d blocks in the group %d\n",

		count, group);



	if (ret < 0)

		count = ret;



	return count;

}