[CRIU] [PATCH 01/16] dump: hide fd open in dump routine

[Kinsbursky Stanislav]

Signed-off-by: Stanislav Kinsbursky <skinsbursky at openvz.org>

---
 cr-dump.c |   92 ++++++++++++++++++++++++++++++-------------------------------
 1 files changed, 45 insertions(+), 47 deletions(-)

diff --git a/cr-dump.c b/cr-dump.c
index 7d43b74..8907623 100644
--- a/cr-dump.c
+++ b/cr-dump.c
@@ -272,25 +272,57 @@ err:
 	return ret;
 }
 
-static int dump_one_fd(pid_t pid, int pid_fd_dir, int lfd,
-		       struct fd_parms *p, struct cr_fdset *cr_fdset,
+static int read_fd_params(pid_t pid, char *fd, struct fd_parms *p)
+{
+	FILE *file;
+	int ret;
+
+	file = fopen_proc(pid, "fdinfo/%s", fd);
+	if (!file)
+		return -1;
+
+	p->fd_name = atoi(fd);
+	ret = fscanf(file, "pos:\t%li\nflags:\t%o\n", &p->pos, &p->flags);
+	fclose(file);
+
+	if (ret != 2) {
+		pr_err("Bad format of fdinfo file (%d items, want 2)\n", ret);
+		return -1;
+	}
+
+	pr_info("%d fdinfo %s: pos: %16lx flags: %16o\n",
+		pid, fd, p->pos, p->flags);
+
+	p->pid	= pid;
+	p->id	= FD_ID_INVALID;
+
+	return 0;
+}
+
+static int dump_one_fd(pid_t pid, int pid_fd_dir, char *d_name, struct cr_fdset *cr_fdset,
 		       struct sk_queue *sk_queue)
 {
 	struct statfs stfs_buf;
 	struct stat st_buf;
 	int err = -1;
+	struct fd_parms p;
+	int lfd;
 
+	if (read_fd_params(pid, d_name, &p))
+		return -1;
+
+	lfd = openat(pid_fd_dir, d_name, O_RDONLY);
 	if (lfd < 0) {
-		err = try_dump_socket(pid, p->fd_name, cr_fdset, sk_queue);
+		err = try_dump_socket(pid, p.fd_name, cr_fdset, sk_queue);
 		if (err != 1)
 			return err;
 
-		pr_perror("Failed to open %d/%ld", pid_fd_dir, p->fd_name);
+		pr_perror("Failed to open %d/%ld", pid_fd_dir, p.fd_name);
 		return -1;
 	}
 
 	if (fstat(lfd, &st_buf) < 0) {
-		pr_perror("Can't get stat on %ld", p->fd_name);
+		pr_perror("Can't get stat on %ld", p.fd_name);
 		goto out_close;
 	}
 
@@ -298,10 +330,10 @@ static int dump_one_fd(pid_t pid, int pid_fd_dir, int lfd,
 	    (major(st_buf.st_rdev) == TTY_MAJOR ||
 	     major(st_buf.st_rdev) == UNIX98_PTY_SLAVE_MAJOR)) {
 		/* skip only standard destriptors */
-		if (p->fd_name < 3) {
+		if (p.fd_name < 3) {
 			err = 0;
 			pr_info("... Skipping tty ... %d/%ld\n",
-				pid_fd_dir, p->fd_name);
+				pid_fd_dir, p.fd_name);
 			goto out_close;
 		}
 		goto err;
@@ -311,56 +343,29 @@ static int dump_one_fd(pid_t pid, int pid_fd_dir, int lfd,
 	    S_ISDIR(st_buf.st_mode) ||
 	    (S_ISCHR(st_buf.st_mode) && major(st_buf.st_rdev) == MEM_MAJOR)) {
 
-		p->id = MAKE_FD_GENID(st_buf.st_dev, st_buf.st_ino, p->pos);
+		p.id = MAKE_FD_GENID(st_buf.st_dev, st_buf.st_ino, p.pos);
 
-		return dump_one_reg_file(FDINFO_FD, p, lfd, cr_fdset, 1);
+		return dump_one_reg_file(FDINFO_FD, &p, lfd, cr_fdset, 1);
 	}
 
 	if (S_ISFIFO(st_buf.st_mode)) {
 		if (fstatfs(lfd, &stfs_buf) < 0) {
-			pr_perror("Can't fstatfs on %ld", p->fd_name);
+			pr_perror("Can't fstatfs on %ld", p.fd_name);
 			return -1;
 		}
 
 		if (stfs_buf.f_type == PIPEFS_MAGIC)
-			return dump_one_pipe(p, st_buf.st_ino, lfd, cr_fdset);
+			return dump_one_pipe(&p, st_buf.st_ino, lfd, cr_fdset);
 	}
 
 err:
-	pr_err("Can't dump file %ld of that type [%x]\n", p->fd_name, st_buf.st_mode);
+	pr_err("Can't dump file %ld of that type [%x]\n", p.fd_name, st_buf.st_mode);
 
 out_close:
 	close_safe(&lfd);
 	return err;
 }
 
-static int read_fd_params(pid_t pid, char *fd, struct fd_parms *p)
-{
-	FILE *file;
-	int ret;
-
-	file = fopen_proc(pid, "fdinfo/%s", fd);
-	if (!file)
-		return -1;
-
-	p->fd_name = atoi(fd);
-	ret = fscanf(file, "pos:\t%li\nflags:\t%o\n", &p->pos, &p->flags);
-	fclose(file);
-
-	if (ret != 2) {
-		pr_err("Bad format of fdinfo file (%d items, want 2)\n", ret);
-		return -1;
-	}
-
-	pr_info("%d fdinfo %s: pos: %16lx flags: %16o\n",
-		pid, fd, p->pos, p->flags);
-
-	p->pid	= pid;
-	p->id	= FD_ID_INVALID;
-
-	return 0;
-}
-
 static int dump_task_files(pid_t pid, struct cr_fdset *cr_fdset,
 			   struct sk_queue *sk_queue)
 {
@@ -388,18 +393,11 @@ static int dump_task_files(pid_t pid, struct cr_fdset *cr_fdset,
 		return -1;
 
 	while ((de = readdir(fd_dir))) {
-		struct fd_parms p;
-		int lfd;
-
 		if (!strcmp(de->d_name, "."))
 			continue;
 		if (!strcmp(de->d_name, ".."))
 			continue;
-		if (read_fd_params(pid, de->d_name, &p))
-			return -1;
-
-		lfd = openat(dirfd(fd_dir), de->d_name, O_RDONLY);
-		if (dump_one_fd(pid, dirfd(fd_dir), lfd, &p, cr_fdset,
+		if (dump_one_fd(pid, dirfd(fd_dir), de->d_name, cr_fdset,
 				sk_queue))
 			return -1;
 	}