diff options
Diffstat (limited to 'fatfs/fat.c')
| -rw-r--r-- | fatfs/fat.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/fatfs/fat.c b/fatfs/fat.c index f2f67aa6..86fe908e 100644 --- a/fatfs/fat.c +++ b/fatfs/fat.c @@ -385,14 +385,17 @@ fat_extend_chain (struct node *node, cluster_t new_last_cluster, int create) dn->last = dn->first = *table; return 0; } - - spin_lock(&dn->chain_extension_lock); + spin_lock(&dn->chain_extension_lock); + /* If we already have what we need, or we have all clusters that are available without allocating new ones, go out. */ if (new_last_cluster < dn->length_of_chain || (!create && dn->chain_complete)) - return 0; + { + spin_unlock(&dn->chain_extension_lock); + return 0; + } left = new_last_cluster + 1 - dn->length_of_chain; @@ -517,6 +520,7 @@ fat_truncate_node (struct node *node, cluster_t clusters_to_keep) /* Deallocate the complete file. */ node->dn->start_cluster = 0; pos = count = offs = 0; + node->dn->last = 0; } else { @@ -525,6 +529,11 @@ fat_truncate_node (struct node *node, cluster_t clusters_to_keep) while (count-- > 0) { assert (next); + + /* This cluster is now the last cluster in the chain. */ + if (count == 0) + node->dn->last = next; + next = next->next; } assert (next); @@ -566,6 +575,11 @@ fat_truncate_node (struct node *node, cluster_t clusters_to_keep) free (next); next = next_next; } + + if (clusters_to_keep == 0) + node->dn->first = 0; + + node->dn->length_of_chain = clusters_to_keep; } |