---

yaml --- r: 31039 b: refs/heads/master c: 81b0c87 h: refs/heads/master i: 31037: 31c246b 31035: 8d79380 31031: 706f8f4 31023: ef92152 31007: 9b365ca 30975: abd44fd v: v3
git-mirror · Jun 29, 2006 · bf03e5b · bf03e5b
1 parent 82478c4
commit bf03e5b
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Showing 3 changed files with 11 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0686cd8fbe3e5fb1441ae84b9cbc813f9297b879
+refs/heads/master: 81b0c8713385ce1b1b9058e916edcf9561ad76d6
diff --git a/trunk/mm/filemap.c b/trunk/mm/filemap.c
@@ -2125,6 +2125,12 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 			break;
 		}
 
+		if (unlikely(bytes == 0)) {
+			status = 0;
+			copied = 0;
+			goto zero_length_segment;
+		}
+
 		status = a_ops->prepare_write(file, page, offset, offset+bytes);
 		if (unlikely(status)) {
 			loff_t isize = i_size_read(inode);
@@ -2154,7 +2160,8 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 			page_cache_release(page);
 			continue;
 		}
-		if (likely(copied > 0)) {
+zero_length_segment:
+		if (likely(copied >= 0)) {
 			if (!status)
 				status = copied;
 

diff --git a/trunk/mm/filemap.h b/trunk/mm/filemap.h
@@ -88,7 +88,7 @@ filemap_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
 	const struct iovec *iov = *iovp;
 	size_t base = *basep;
 
-	while (bytes) {
+	do {
 		int copy = min(bytes, iov->iov_len - base);
 
 		bytes -= copy;
@@ -97,7 +97,7 @@ filemap_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
 			iov++;
 			base = 0;
 		}
-	}
+	} while (bytes);
 	*iovp = iov;
 	*basep = base;
 }