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HDFS-3710. libhdfs misuses O_RDONLY/WRONLY/RDWR. Contributed by Andy Isaacson. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1370898 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-08-08 19:11:30 +00:00
parent 4920387b8a
commit b587af4631
3 changed files with 29 additions and 12 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -568,6 +568,8 @@ Branch-2 ( Unreleased changes )
HDFS-3760. primitiveCreate is a write, not a read. (Andy Isaacson via atm)
HDFS-3710. libhdfs misuses O_RDONLY/WRONLY/RDWR. (Andy Isaacson via atm)
BREAKDOWN OF HDFS-3042 SUBTASKS
HDFS-2185. HDFS portion of ZK-based FailoverController (todd)

36
hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/hdfs.c
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@ -657,6 +657,7 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
*/
/* Get the JNIEnv* corresponding to current thread */
JNIEnv* env = getJNIEnv();
int accmode = flags & O_ACCMODE;
if (env == NULL) {
errno = EINTERNAL;
@ -672,10 +673,16 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
hdfsFile file = NULL;
int ret;
if (flags & O_RDWR) {
if (accmode == O_RDONLY || accmode == O_WRONLY) {
/* yay */
} else if (accmode == O_RDWR) {
fprintf(stderr, "ERROR: cannot open an hdfs file in O_RDWR mode\n");
errno = ENOTSUP;
return NULL;
} else {
fprintf(stderr, "ERROR: cannot open an hdfs file in mode 0x%x\n", accmode);
errno = EINVAL;
return NULL;
}
if ((flags & O_CREAT) && (flags & O_EXCL)) {
@ -683,12 +690,19 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
}
/* The hadoop java api/signature */
const char* method = ((flags & O_WRONLY) == 0) ? "open" : (flags & O_APPEND) ? "append" : "create";
const char* signature = ((flags & O_WRONLY) == 0) ?
JMETHOD2(JPARAM(HADOOP_PATH), "I", JPARAM(HADOOP_ISTRM)) :
(flags & O_APPEND) ?
JMETHOD1(JPARAM(HADOOP_PATH), JPARAM(HADOOP_OSTRM)) :
JMETHOD2(JPARAM(HADOOP_PATH), "ZISJ", JPARAM(HADOOP_OSTRM));
const char* method = NULL;
const char* signature = NULL;
if (accmode == O_RDONLY) {
method = "open";
signature = JMETHOD2(JPARAM(HADOOP_PATH), "I", JPARAM(HADOOP_ISTRM));
} else if (flags & O_APPEND) {
method = "append";
signature = JMETHOD1(JPARAM(HADOOP_PATH), JPARAM(HADOOP_OSTRM));
} else {
method = "create";
signature = JMETHOD2(JPARAM(HADOOP_PATH), "ZISJ", JPARAM(HADOOP_OSTRM));
}
/* Create an object of org.apache.hadoop.fs.Path */
jthr = constructNewObjectOfPath(env, path, &jPath);
@ -741,9 +755,7 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
jBufferSize = jVal.i;
}
if ((flags & O_WRONLY) && (flags & O_APPEND) == 0) {
//replication
if ((accmode == O_WRONLY) && (flags & O_APPEND) == 0) {
if (!replication) {
jthr = invokeMethod(env, &jVal, INSTANCE, jConfiguration,
HADOOP_CONF, "getInt", "(Ljava/lang/String;I)I",
@ -776,10 +788,10 @@ hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
FSDataOutputStream references jobject jStream */
// READ?
if ((flags & O_WRONLY) == 0) {
if (accmode == O_RDONLY) {
jthr = invokeMethod(env, &jVal, INSTANCE, jFS, HADOOP_FS,
method, signature, jPath, jBufferSize);
} else if ((flags & O_WRONLY) && (flags & O_APPEND)) {
} else if ((accmode == O_WRONLY) && (flags & O_APPEND)) {
// WRITE/APPEND?
jthr = invokeMethod(env, &jVal, INSTANCE, jFS, HADOOP_FS,
method, signature, jPath);

3
hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/test_libhdfs_threaded.c
View File

@ -80,6 +80,9 @@ static int doTestHdfsOperations(struct tlhThreadInfo *ti, hdfsFS fs)
/* There should not be any file to open for reading. */
EXPECT_NULL(hdfsOpenFile(fs, tmp, O_RDONLY, 0, 0, 0));
/* hdfsOpenFile should not accept mode = 3 */
EXPECT_NULL(hdfsOpenFile(fs, tmp, 3, 0, 0, 0));
file = hdfsOpenFile(fs, tmp, O_WRONLY, 0, 0, 0);
EXPECT_NONNULL(file);