diff options
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ocfs2/refcounttree.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index 3ac5aa733e9c..73a11ccfd4c2 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c | |||
@@ -2436,16 +2436,26 @@ static int ocfs2_calc_refcount_meta_credits(struct super_block *sb, | |||
2436 | len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + | 2436 | len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + |
2437 | le32_to_cpu(rec.r_clusters)) - cpos; | 2437 | le32_to_cpu(rec.r_clusters)) - cpos; |
2438 | /* | 2438 | /* |
2439 | * If the refcount rec already exist, cool. We just need | ||
2440 | * to check whether there is a split. Otherwise we just need | ||
2441 | * to increase the refcount. | ||
2442 | * If we will insert one, increases recs_add. | ||
2443 | * | ||
2444 | * We record all the records which will be inserted to the | 2439 | * We record all the records which will be inserted to the |
2445 | * same refcount block, so that we can tell exactly whether | 2440 | * same refcount block, so that we can tell exactly whether |
2446 | * we need a new refcount block or not. | 2441 | * we need a new refcount block or not. |
2442 | * | ||
2443 | * If we will insert a new one, this is easy and only happens | ||
2444 | * during adding refcounted flag to the extent, so we don't | ||
2445 | * have a chance of spliting. We just need one record. | ||
2446 | * | ||
2447 | * If the refcount rec already exists, that would be a little | ||
2448 | * complicated. we may have to: | ||
2449 | * 1) split at the beginning if the start pos isn't aligned. | ||
2450 | * we need 1 more record in this case. | ||
2451 | * 2) split int the end if the end pos isn't aligned. | ||
2452 | * we need 1 more record in this case. | ||
2453 | * 3) split in the middle because of file system fragmentation. | ||
2454 | * we need 2 more records in this case(we can't detect this | ||
2455 | * beforehand, so always think of the worst case). | ||
2447 | */ | 2456 | */ |
2448 | if (rec.r_refcount) { | 2457 | if (rec.r_refcount) { |
2458 | recs_add += 2; | ||
2449 | /* Check whether we need a split at the beginning. */ | 2459 | /* Check whether we need a split at the beginning. */ |
2450 | if (cpos == start_cpos && | 2460 | if (cpos == start_cpos && |
2451 | cpos != le64_to_cpu(rec.r_cpos)) | 2461 | cpos != le64_to_cpu(rec.r_cpos)) |