* [PATCH] ext4: stop issuing discards if not supported by device
@ 2010-03-10 16:54 Eric Sandeen
2010-04-08 0:58 ` tytso
0 siblings, 1 reply; 2+ messages in thread
From: Eric Sandeen @ 2010-03-10 16:54 UTC (permalink / raw)
To: ext4 development
Turn off issuance of discard requests if the device does
not support it - similar to the action we take for barriers.
This will save a little computation time if a non-discardable
device is mounted with -o discard, and also makes it obvious
that it's not doing what was asked at mount time ...
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 506713a..6ee4cac 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2556,6 +2556,7 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
}
ext4_unlock_group(sb, entry->group);
if (test_opt(sb, DISCARD)) {
+ int ret;
ext4_fsblk_t discard_block;
discard_block = entry->start_blk +
@@ -2563,7 +2564,12 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
trace_ext4_discard_blocks(sb,
(unsigned long long)discard_block,
entry->count);
- sb_issue_discard(sb, 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);
+ }
}
kmem_cache_free(ext4_free_ext_cachep, entry);
ext4_mb_release_desc(&e4b);
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ext4: stop issuing discards if not supported by device
2010-03-10 16:54 [PATCH] ext4: stop issuing discards if not supported by device Eric Sandeen
@ 2010-04-08 0:58 ` tytso
0 siblings, 0 replies; 2+ messages in thread
From: tytso @ 2010-04-08 0:58 UTC (permalink / raw)
To: Eric Sandeen; +Cc: ext4 development
On Wed, Mar 10, 2010 at 10:54:03AM -0600, Eric Sandeen wrote:
> Turn off issuance of discard requests if the device does
> not support it - similar to the action we take for barriers.
> This will save a little computation time if a non-discardable
> device is mounted with -o discard, and also makes it obvious
> that it's not doing what was asked at mount time ...
>
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Added to the ext4 patch queue, thanks.
- Ted
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-03-10 16:54 [PATCH] ext4: stop issuing discards if not supported by device Eric Sandeen
2010-04-08 0:58 ` tytso
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