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ext4: warn when discard request fails other than EOPNOTSUPP 

We should warn user then the discard request fails. However we need to
exclude -EOPNOTSUPP case since parts of the device might not support it
while other parts can. So print the kernel warning when the error !=
-EOPNOTSUPP is returned from ext4_issue_discard().

We should also handle error cases in batched discard, again excluding
EOPNOTSUPP.

Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Lukas Czerner 2012-11-08 14:04:52 -05:00 committed by Theodore Ts'o
parent 79add3a3f7
commit d71c1ae23a
1 changed files with 35 additions and 12 deletions
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45
fs/ext4/mballoc.c
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@ -2607,9 +2607,17 @@ static void ext4_free_data_callback(struct super_block *sb,
mb_debug(1, "gonna free %u blocks in group %u (0x%p):",
entry->efd_count, entry->efd_group, entry);
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, entry->efd_group,
entry->efd_start_cluster, entry->efd_count);
if (test_opt(sb, DISCARD)) {
err = ext4_issue_discard(sb, entry->efd_group,
entry->efd_start_cluster,
entry->efd_count);
if (err && err != -EOPNOTSUPP)
ext4_msg(sb, KERN_WARNING, "discard request in"
" group:%d block:%d count:%d failed"
" with %d", entry->efd_group,
entry->efd_start_cluster,
entry->efd_count, err);
}
err = ext4_mb_load_buddy(sb, entry->efd_group, &e4b);
/* we expect to find existing buddy because it's pinned */
@ -4659,8 +4667,16 @@ do_more:
* with group lock held. generate_buddy look at
* them with group lock_held
*/
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, block_group, bit, count);
if (test_opt(sb, DISCARD)) {
err = ext4_issue_discard(sb, block_group, bit, count);
if (err && err != -EOPNOTSUPP)
ext4_msg(sb, KERN_WARNING, "discard request in"
" group:%d block:%d count:%lu failed"
" with %d", block_group, bit, count,
err);
}
ext4_lock_group(sb, block_group);
mb_clear_bits(bitmap_bh->b_data, bit, count_clusters);
mb_free_blocks(inode, &e4b, bit, count_clusters);
@ -4854,10 +4870,11 @@ error_return:
* one will allocate those blocks, mark it as used in buddy bitmap. This must
* be called with under the group lock.
*/
static void ext4_trim_extent(struct super_block *sb, int start, int count,
static int 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;
trace_ext4_trim_extent(sb, group, start, count);
@ -4873,9 +4890,10 @@ static void ext4_trim_extent(struct super_block *sb, int start, int count,
*/
mb_mark_used(e4b, &ex);
ext4_unlock_group(sb, group);
ext4_issue_discard(sb, group, start, count);
ret = ext4_issue_discard(sb, group, start, count);
ext4_lock_group(sb, group);
mb_free_blocks(NULL, e4b, start, ex.fe_len);
return ret;
}
/**
@ -4904,7 +4922,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
void *bitmap;
ext4_grpblk_t next, count = 0, free_count = 0;
struct ext4_buddy e4b;
int ret;
int ret = 0;
trace_ext4_trim_all_free(sb, group, start, max);
@ -4931,8 +4949,11 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
next = mb_find_next_bit(bitmap, max + 1, start);
if ((next - start) >= minblocks) {
ext4_trim_extent(sb, start,
ret = ext4_trim_extent(sb, start,
next - start, group, &e4b);
if (ret && ret != -EOPNOTSUPP)
break;
ret = 0;
count += next - start;
}
free_count += next - start;
@ -4953,8 +4974,10 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
break;
}
if (!ret)
if (!ret) {
ret = count;
EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info);
}
out:
ext4_unlock_group(sb, group);
ext4_mb_unload_buddy(&e4b);
@ -4962,7 +4985,7 @@ out:
ext4_debug("trimmed %d blocks in the group %d\n",
count, group);
return count;
return ret;
}
/**