From 06ad513532b1a6085abf4a5dab15d1a4719f715c Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Wed, 27 Apr 2016 11:04:56 +0100 Subject: [PATCH] migration: introduce set_blocking function in QEMUFileOps Remove the assumption that every QEMUFile implementation has a file descriptor available by introducing a new function in QEMUFileOps to change the blocking state of a QEMUFile. If not set, it will fallback to the original code using the get_fd method. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Daniel P. Berrange Reviewed-by: Juan Quintela Message-Id: <1461751518-12128-7-git-send-email-berrange@redhat.com> Signed-off-by: Amit Shah --- include/migration/qemu-file.h | 5 +++++ migration/migration.c | 4 +--- migration/qemu-file.c | 10 +++++++--- 3 files changed, 13 insertions(+), 6 deletions(-) diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h index 1934a64..2dea81f 100644 --- a/include/migration/qemu-file.h +++ b/include/migration/qemu-file.h @@ -54,6 +54,10 @@ typedef int (QEMUFileCloseFunc)(void *opaque); */ typedef int (QEMUFileGetFD)(void *opaque); +/* Called to change the blocking mode of the file + */ +typedef int (QEMUFileSetBlocking)(void *opaque, bool enabled); + /* * This function writes an iovec to file. The handler must write all * of the data or return a negative errno value. @@ -107,6 +111,7 @@ typedef struct QEMUFileOps { QEMUFileGetBufferFunc *get_buffer; QEMUFileCloseFunc *close; QEMUFileGetFD *get_fd; + QEMUFileSetBlocking *set_blocking; QEMUFileWritevBufferFunc *writev_buffer; QEMURetPathFunc *get_return_path; QEMUFileShutdownFunc *shut_down; diff --git a/migration/migration.c b/migration/migration.c index f5327e8..ac7790f 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -422,11 +422,9 @@ static void process_incoming_migration_co(void *opaque) void process_incoming_migration(QEMUFile *f) { Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); - int fd = qemu_get_fd(f); - assert(fd != -1); migrate_decompress_threads_create(); - qemu_set_nonblock(fd); + qemu_file_set_blocking(f, false); qemu_coroutine_enter(co, f); } diff --git a/migration/qemu-file.c b/migration/qemu-file.c index b480b72..2b25dec 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -684,9 +684,13 @@ size_t qemu_get_counted_string(QEMUFile *f, char buf[256]) */ void qemu_file_set_blocking(QEMUFile *f, bool block) { - if (block) { - qemu_set_block(qemu_get_fd(f)); + if (f->ops->set_blocking) { + f->ops->set_blocking(f->opaque, block); } else { - qemu_set_nonblock(qemu_get_fd(f)); + if (block) { + qemu_set_block(qemu_get_fd(f)); + } else { + qemu_set_nonblock(qemu_get_fd(f)); + } } } -- 2.7.4