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fuse-overlayfs: implement mknod

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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2018-07-12 14:39:15 +02:00
parent b8f90ec1f6
commit 4d34e45e37
No known key found for this signature in database
GPG Key ID: E4730F97F60286ED
1 changed files with 103 additions and 6 deletions
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109
main.c
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@ -586,8 +586,8 @@ make_ovl_node (const char *path, struct ovl_layer *layer, const char *name, ino_
ret->layer = layer;
ret->ino = ino;
ret->present_lowerdir = 0;
ret->hidden_dirfd = -1;
ret->name = strdup (name);
ret->hidden_dirfd = 0;
if (ret->name == NULL)
{
free (ret);
@ -632,7 +632,7 @@ make_ovl_node (const char *path, struct ovl_layer *layer, const char *name, ino_
for (it = layer; it; it = it->next)
{
ssize_t s;
int fd = TEMP_FAILURE_RETRY (openat (it->fd, path, O_RDONLY));
int fd = TEMP_FAILURE_RETRY (openat (it->fd, path, O_PATH|O_RDONLY));
if (fd < 0)
continue;
@ -777,10 +777,10 @@ load_dir (struct ovl_data *lo, struct ovl_node *n, struct ovl_layer *layer, char
}
if (insert_node (n, child, false) == NULL)
{
errno = ENOMEM;
return NULL;
}
{
errno = ENOMEM;
return NULL;
}
}
closedir (dp);
}
@ -2637,6 +2637,102 @@ hide_all (struct ovl_data *lo, struct ovl_node *node)
return 0;
}
static void
ovl_mknod (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev_t rdev)
{
struct ovl_node *node;
struct ovl_data *lo = ovl_data (req);
struct ovl_node *pnode;
int ret = 0;
char path[PATH_MAX + 10];
struct fuse_entry_param e;
const struct fuse_ctx *ctx = fuse_req_ctx (req);
char wd_tmp_file_name[32];
if (ovl_debug (req))
fprintf (stderr, "ovl_mknod(ino=%" PRIu64 ", name=%s, mode=%d, rdev=%lu)\n",
parent, name, mode, rdev);
node = do_lookup_file (lo, parent, name);
if (node != NULL)
{
fuse_reply_err (req, EEXIST);
return;
}
pnode = do_lookup_file (lo, parent, NULL);
if (pnode == NULL)
{
fuse_reply_err (req, ENOENT);
return;
}
pnode = get_node_up (lo, pnode);
if (pnode == NULL)
{
fuse_reply_err (req, errno);
return;
}
sprintf (wd_tmp_file_name, "%lu", get_next_wd_counter ());
ret = mknodat (lo->workdir_fd, wd_tmp_file_name, mode, rdev);
if (ret < 0)
{
fuse_reply_err (req, errno);
return;
}
if (fchownat (lo->workdir_fd, wd_tmp_file_name, get_uid (lo, ctx->uid), get_gid (lo, ctx->gid), 0) < 0)
{
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
fuse_reply_err (req, errno);
return;
}
sprintf (path, "%s/%s", pnode->path, name);
ret = renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, path);
if (ret < 0)
{
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
fuse_reply_err (req, errno);
return;
}
node = make_ovl_node (path, get_upper_layer (lo), name, 0, false);
if (node == NULL)
{
fuse_reply_err (req, ENOMEM);
return;
}
node = insert_node (pnode, node, true);
if (node == NULL)
{
fuse_reply_err (req, ENOMEM);
return;
}
if (delete_whiteout (lo, -1, pnode, name) < 0)
{
fuse_reply_err (req, errno);
return;
}
memset (&e, 0, sizeof (e));
ret = rpl_stat (req, node, &e.attr);
if (ret)
{
fuse_reply_err (req, errno);
return;
}
e.ino = NODE_TO_INODE (node);
e.attr_timeout = ATTR_TIMEOUT;
e.entry_timeout = ENTRY_TIMEOUT;
node->lookups++;
fuse_reply_entry (req, &e);
}
static void
ovl_mkdir (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode)
{
@ -2766,6 +2862,7 @@ static struct fuse_lowlevel_ops ovl_oper =
.symlink = ovl_symlink,
.rename = ovl_rename,
.mkdir = ovl_mkdir,
.mknod = ovl_mknod,
.link = ovl_link,
.fsync = ovl_fsync,
.flock = ovl_flock,