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ext4: Support discard requests when running in no-journal mode 

Issue discard request in ext4_free_blocks() when ext4 has no journal and
is mounted with discard option.
    
Signed-off-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jiaying Zhang 2010-07-27 11:56:05 -04:00 committed by Theodore Ts'o
parent 47def82672
commit 5c521830cf
1 changed files with 21 additions and 16 deletions
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37
fs/ext4/mballoc.c
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@ -2558,6 +2558,22 @@ int ext4_mb_release(struct super_block *sb)
return 0;
}
static inline void ext4_issue_discard(struct super_block *sb,
ext4_group_t block_group, ext4_grpblk_t block, int count)
{
int ret;
ext4_fsblk_t discard_block;
discard_block = block + ext4_group_first_block_no(sb, block_group);
trace_ext4_discard_blocks(sb,
(unsigned long long) discard_block, count);
ret = sb_issue_discard(sb, discard_block, count);
if (ret == EOPNOTSUPP) {
ext4_warning(sb, "discard not supported, disabling");
clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
}
}
/*
* This function is called by the jbd2 layer once the commit has finished,
* so we know we can free the blocks that were released with that commit.
@ -2577,22 +2593,9 @@ 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)) {
int ret;
ext4_fsblk_t discard_block;
discard_block = entry->start_blk +
ext4_group_first_block_no(sb, entry->group);
trace_ext4_discard_blocks(sb,
(unsigned long long)discard_block,
entry->count);
ret = sb_issue_discard(sb, discard_block, entry->count);
if (ret == EOPNOTSUPP) {
ext4_warning(sb,
"discard not supported, disabling");
clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
}
}
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, entry->group,
entry->start_blk, entry->count);
err = ext4_mb_load_buddy(sb, entry->group, &e4b);
/* we expect to find existing buddy because it's pinned */
@ -4639,6 +4642,8 @@ do_more:
mb_clear_bits(bitmap_bh->b_data, bit, count);
mb_free_blocks(inode, &e4b, bit, count);
ext4_mb_return_to_preallocation(inode, &e4b, block, count);
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, block_group, bit, count);
}
ret = ext4_free_blks_count(sb, gdp) + count;