[CRIU] [PATCH 1/5] locks: Add c/r of non broken leases (kernel>=v4.1)

[Pavel Begunkov]

Leases in breaking state are not supported. In that case criu will
report an error during the dumping. Also it works only if lock info is
presented in /proc/<pid>/fdinfo (since kernel 4.1)

task #39

Signed-off-by: Pavel Begunkov <asml.silence at gmail.com>
---
 criu/file-lock.c         | 9 +++++++++
 criu/include/file-lock.h | 1 +
 criu/proc_parse.c        | 5 +++++
 3 files changed, 15 insertions(+)

diff --git a/criu/file-lock.c b/criu/file-lock.c
index 2d4036c75..92d8bd394 100644
--- a/criu/file-lock.c
+++ b/criu/file-lock.c
@@ -292,6 +292,9 @@ int note_file_lock(struct pid *pid, int fd, int lfd, struct fd_parms *p)
 			 */
 			if (fl->fl_owner != pid->real)
 				continue;
+		} else if (fl->fl_kind == FL_LEASE) {
+			pr_err("Leases are not supported for kernel <= v4.0");
+			return -1;
 		} else /* fl->fl_kind == FL_FLOCK || fl->fl_kind == FL_OFD */ {
 			int ret;
 
@@ -395,6 +398,12 @@ static int restore_file_lock(FileLockEntry *fle)
 			pr_err("Can not set ofd lock!\n");
 			goto err;
 		}
+	} else if (fle->flag & FL_LEASE) {
+		ret = fcntl(fle->fd, F_SETLEASE, fle->type);
+		if (ret < 0) {
+			pr_perror("Can't set lease!\n");
+			goto err;
+		}
 	} else {
 		pr_err("Unknown file lock style!\n");
 		goto err;
diff --git a/criu/include/file-lock.h b/criu/include/file-lock.h
index c3f2dabf7..f70739adb 100644
--- a/criu/include/file-lock.h
+++ b/criu/include/file-lock.h
@@ -10,6 +10,7 @@
 #define FL_POSIX	1
 #define FL_FLOCK	2
 #define FL_OFD		4
+#define FL_LEASE	8
 
 /* for posix fcntl() and lockf() */
 #ifndef F_RDLCK
diff --git a/criu/proc_parse.c b/criu/proc_parse.c
index e33da8d56..d3893272c 100644
--- a/criu/proc_parse.c
+++ b/criu/proc_parse.c
@@ -1991,6 +1991,8 @@ static int parse_file_lock_buf(char *buf, struct file_lock *fl,
 		fl->fl_kind = FL_FLOCK;
 	else if (!strcmp(fl_flag, "OFDLCK"))
 		fl->fl_kind = FL_OFD;
+	else if (!strcmp(fl_flag, "LEASE"))
+		fl->fl_kind = FL_LEASE;
 	else
 		fl->fl_kind = FL_UNKNOWN;
 
@@ -2007,6 +2009,9 @@ static int parse_file_lock_buf(char *buf, struct file_lock *fl,
 			pr_err("Unknown lock option!\n");
 			return -1;
 		}
+	} else if (fl->fl_kind == FL_LEASE && !strcmp(fl_type, "BREAKING")) {
+		pr_err("Breaking leases are not supported (%d): %s\n",
+			num, buf);
 	} else {
 		if (!strcmp(fl_option, "UNLCK")) {
 			fl->fl_ltype |= F_UNLCK;
-- 
2.11.1