Mercurial > dovecot > original-hg > dovecot-1.2

changeset 6100:a55ee2e3caac HEAD

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Don't write list index header if it hasn't changed.
author Timo Sirainen <tss@iki.fi>
date Thu, 19 Jul 2007 04:18:30 +0300
parents 33d589af9933
children 6805ccf0b82e
files src/lib-index/mailbox-list-index-sync.c
diffstat 1 files changed, 11 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/src/lib-index/mailbox-list-index-sync.c	Thu Jul 19 04:18:10 2007 +0300
+++ b/src/lib-index/mailbox-list-index-sync.c	Thu Jul 19 04:18:30 2007 +0300
@@ -64,6 +64,7 @@
 	buffer_t *output_buf;
 
 	unsigned int failed:1;
+	unsigned int changed:1;
 	unsigned int restart:1;
 	unsigned int partial:1;
 	unsigned int seen_sync_root:1;
@@ -180,6 +181,8 @@
 {
 	struct mailbox_list_sync_record *rec;
 
+	ctx->changed = TRUE;
+
 	rec = array_insert_space(&dir->records, idx);
 	rec->name_hash = crc32_str(name);
 	rec->name = p_strdup(ctx->pool, name);
@@ -525,6 +528,7 @@
 
 	*base_offset_r = pos;
 	ctx->hdr.used_space = pos + size;
+	ctx->changed = TRUE;
 	return 0;
 }
 
@@ -683,6 +687,7 @@
 	}
 
 	ctx->hdr.deleted_space += deleted_space;
+	ctx->changed = TRUE;
 	sync_dir->offset = base_offset;
 	return 0;
 }
@@ -758,6 +763,7 @@
 		o_stream_seek(ctx->output, old_offset);
 		t_pop();
 	}
+	ctx->changed = TRUE;
 	return 0;
 }
 
@@ -862,7 +868,9 @@
 	if (mailbox_list_index_sync_write_dir(ctx, ctx->root, 0, partial) < 0)
 		ret = -1;
 
-	if (!ctx->index->mmap_disable) {
+	if (!ctx->changed) {
+		/* nothing written */
+	} else if (!ctx->index->mmap_disable) {
 		/* update header */
 		hdr = ctx->index->mmap_base;
 		if (ret == 0)
@@ -891,7 +899,8 @@
 							     "fdatasync()");
 			ret = -1;
 		}
-
+	}
+	if (ctx->index->mmap_disable) {
 		o_stream_destroy(&ctx->output);
 		buffer_free(ctx->output_buf);
 	}