moved snap.c from sheep/farm to collie/farm and made minor modification.
Signed-off-by: Kai Zhang <[email protected]>
---
collie/Makefile.am | 3 +-
collie/farm/farm.h | 9 +++
collie/farm/snap.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+), 1 deletions(-)
create mode 100644 collie/farm/snap.c
diff --git a/collie/Makefile.am b/collie/Makefile.am
index d185512..49d760c 100644
--- a/collie/Makefile.am
+++ b/collie/Makefile.am
@@ -23,7 +23,8 @@ INCLUDES = -I$(top_builddir)/include
-I$(top_srcdir)/include
sbin_PROGRAMS = collie
-collie_SOURCES = farm/object_rb_tree.c farm/sha1_file.c farm/farm.c \
+collie_SOURCES = farm/object_rb_tree.c farm/sha1_file.c farm/snap.c \
+ farm/farm.c \
collie.c common.c treeview.c vdi.c node.c cluster.c
if BUILD_TRACE
diff --git a/collie/farm/farm.h b/collie/farm/farm.h
index ca108ca..704a1ba 100644
--- a/collie/farm/farm.h
+++ b/collie/farm/farm.h
@@ -41,6 +41,15 @@ struct sha1_file_hdr {
int farm_init(const char *path);
char *get_object_directory(void);
+/* snap.c */
+int snap_init(const char *path);
+void *snap_file_read(unsigned char *sha1, struct sha1_file_hdr *outhdr);
+int snap_file_write(uint32_t epoch, unsigned char *trunksha1,
+ unsigned char *outsha1);
+int snap_log_truncate(void);
+void *snap_log_read(int *);
+int snap_log_write(uint32_t epoch, unsigned char *sha1);
+
/* sha1_file.c */
int sha1_file_write(unsigned char *buf, unsigned len, unsigned char *);
void *sha1_file_read(const unsigned char *sha1, struct sha1_file_hdr *);
diff --git a/collie/farm/snap.c b/collie/farm/snap.c
new file mode 100644
index 0000000..80366c1
--- /dev/null
+++ b/collie/farm/snap.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2011 Taobao Inc.
+ * Copyright (C) 2013 Zelin Inc.
+ *
+ * Liu Yuan <[email protected]>
+ * Kai Zhang <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <time.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "farm.h"
+
+static char snap_log_path[PATH_MAX];
+
+int snap_init(const char *farm_dir)
+{
+ int fd, ret = -1;
+ struct strbuf buf = STRBUF_INIT;
+
+ strbuf_addstr(&buf, farm_dir);
+ strbuf_addf(&buf, "/%s", "user_snap");
+
+ if (!strlen(snap_log_path))
+ strbuf_copyout(&buf, snap_log_path, sizeof(snap_log_path));
+
+ fd = open(snap_log_path, O_CREAT | O_EXCL, 0666);
+ if (fd < 0) {
+ if (errno != EEXIST) {
+ sd_eprintf("%m");
+ goto out;
+ }
+ }
+
+ ret = 0;
+ close(fd);
+out:
+ strbuf_release(&buf);
+ return ret;
+}
+
+int snap_log_write(uint32_t epoch, unsigned char *sha1)
+{
+ int fd, ret = -1;
+ struct strbuf buf = STRBUF_INIT;
+ struct snap_log log = { .epoch = epoch,
+ .time = time(NULL) };
+
+ memcpy(log.sha1, sha1, SHA1_LEN);
+
+ fd = open(snap_log_path, O_WRONLY | O_APPEND);
+ if (fd < 0) {
+ sd_eprintf("%m");
+ goto out;
+ }
+
+ strbuf_reset(&buf);
+ strbuf_add(&buf, &log, sizeof(log));
+ ret = xwrite(fd, buf.buf, buf.len);
+ if (ret != buf.len)
+ goto out_close;
+
+ ret = 0;
+out_close:
+ close(fd);
+out:
+ strbuf_release(&buf);
+ return ret;
+}
+
+void *snap_log_read(int *out_nr)
+{
+ struct stat st;
+ void *buffer = NULL;
+ int len, fd;
+
+ fd = open(snap_log_path, O_RDONLY);
+ if (fd < 0) {
+ sd_eprintf("%m");
+ goto out;
+ }
+ if (fstat(fd, &st) < 0) {
+ sd_eprintf("%m");
+ goto out_close;
+ }
+
+ len = st.st_size;
+ buffer = xmalloc(len);
+ len = xread(fd, buffer, len);
+ if (len != st.st_size) {
+ free(buffer);
+ buffer = NULL;
+ goto out_close;
+ }
+ *out_nr = len / sizeof(struct snap_log);
+out_close:
+ close(fd);
+out:
+ return buffer;
+}
+
+void *snap_file_read(unsigned char *sha1, struct sha1_file_hdr *outhdr)
+{
+ void *buffer = NULL;
+
+ sd_dprintf("%s", sha1_to_hex(sha1));
+ buffer = sha1_file_read(sha1, outhdr);
+ if (!buffer)
+ return NULL;
+ if (strcmp(outhdr->tag, TAG_SNAP) != 0) {
+ free(buffer);
+ return NULL;
+ }
+
+ return buffer;
+}
+
+int snap_file_write(uint32_t epoch, unsigned char *trunksha1,
+ unsigned char *outsha1)
+{
+ int ret = -1;
+ struct sha1_file_hdr hdr = {};
+ struct strbuf buf = STRBUF_INIT;
+
+ memcpy(hdr.tag, TAG_SNAP, TAG_LEN);
+ hdr.size = SHA1_LEN;
+ hdr.priv = epoch;
+ hdr.reserved = 0;
+
+ strbuf_add(&buf, &hdr, sizeof(hdr));
+ strbuf_add(&buf, trunksha1, SHA1_LEN);
+ if (sha1_file_write((void *)buf.buf, buf.len, outsha1) < 0)
+ goto out;
+
+ sd_dprintf("epoch: %" PRIu32 ", sha1: %s",
+ epoch, sha1_to_hex(outsha1));
+
+ ret = 0;
+out:
+ strbuf_release(&buf);
+ return ret;
+}
--
1.7.1
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