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files-reg: split create_ghost_dentry out of create_ghost

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Will use it to make create_ghost work with mount-v2.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@virtuozzo.com>
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>

Cherry-picked from Virtuozzo criu:
https://src.openvz.org/projects/OVZ/repos/criu/commits/156fa4877
Cherry-picked from Virtuozzo criu:
https://src.openvz.org/projects/OVZ/repos/criu/commits/069bba0ad

Changes: merge fixup.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Stanislav Kinsburskiy 2016-07-11 14:14:15 +03:00 committed by Andrei Vagin
parent 9fb3984a7e
commit 169f95c394
1 changed files with 40 additions and 30 deletions
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70
criu/files-reg.c
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@ -355,32 +355,11 @@ err:
return ret;
}
static int create_ghost(struct ghost_file *gf, GhostFileEntry *gfe, struct cr_img *img)
static int create_ghost_dentry(char *path, GhostFileEntry *gfe, struct cr_img *img)
{
struct mount_info *mi;
char path[PATH_MAX];
int ret, root_len;
int ret = -1;
char *msg;
root_len = ret = rst_get_mnt_root(gf->remap.rmnt_id, path, sizeof(path));
if (ret < 0) {
pr_err("The %d mount is not found for ghost\n", gf->remap.rmnt_id);
goto err;
}
/* Add a '/' only if we have no at the end */
if (path[root_len - 1] != '/') {
path[root_len++] = '/';
path[root_len] = '\0';
}
snprintf(path + root_len, sizeof(path) - root_len, "%s", gf->remap.rpath);
ret = -1;
mi = lookup_mnt_id(gf->remap.rmnt_id);
/* We get here while in service mntns */
if (mi && try_remount_writable(mi, false))
goto err;
again:
if (S_ISFIFO(gfe->mode)) {
if ((ret = mknod(path, gfe->mode, 0)) < 0)
@ -417,18 +396,49 @@ again:
goto err;
}
strcpy(gf->remap.rpath, path + root_len);
pr_debug("Remap rpath is %s\n", gf->remap.rpath);
ret = -1;
if (ghost_apply_metadata(path, gfe))
goto err;
ret = 0;
err:
return ret;
}
static int create_ghost(struct ghost_file *gf, GhostFileEntry *gfe, struct cr_img *img)
{
struct mount_info *mi;
char path[PATH_MAX];
int ret, root_len;
root_len = ret = rst_get_mnt_root(gf->remap.rmnt_id, path, sizeof(path));
if (ret < 0) {
pr_err("The %d mount is not found for ghost\n", gf->remap.rmnt_id);
return -1;
}
/* Add a '/' only if we have no at the end */
if (path[root_len - 1] != '/') {
path[root_len++] = '/';
path[root_len] = '\0';
}
snprintf(path + root_len, sizeof(path) - root_len, "%s", gf->remap.rpath);
ret = -1;
mi = lookup_mnt_id(gf->remap.rmnt_id);
/* We get here while in service mntns */
if (mi && try_remount_writable(mi, false))
return -1;
ret = create_ghost_dentry(path, gfe, img);
if (ret)
return -1;
if (ghost_apply_metadata(path, gfe))
return -1;
strcpy(gf->remap.rpath, path + root_len);
pr_debug("Remap rpath is %s\n", gf->remap.rpath);
return 0;
}
static inline void ghost_path(char *path, int plen, struct reg_file_info *rfi, RemapFilePathEntry *rpe)
{
snprintf(path, plen, "%s.cr.%x.ghost", rfi->path, rpe->remap_id);