jabberwocky238/libfuse
1
0
Fork 0
mirror of https://github.com/libfuse/libfuse.git synced 2026-07-07 14:47:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

memfs_ll: add mknod support

Browse Source 
memfs only created regular files (via create) and directories (via
mkdir), so making a FIFO, socket, or device node failed with ENOSYS.
Add a mknod handler so these node types can be created.

The new dev_t rdev field on Inode stores the device number for
character and block special files and is reported back through
get_attr's st_rdev. The type bits in the mode argument select the
node kind, so the same handler covers all mknod-able types.

Signed-off-by: Bernd Schubert <bernd@bsbernd.com>
This commit is contained in:
Bernd Schubert
2026-06-17 18:15:27 +02:00
parent 2137d4b0cc
commit f420570bf5
1 changed files with 51 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
example/memfs_ll.cc
+51
View File
@@ -109,6 +109,7 @@ class Inode {
std::atomic<nlink_t> nlink;
uid_t uid;
gid_t gid;
dev_t rdev;
friend class Inodes;
@@ -125,6 +126,7 @@ class Inode {
, nlink(dir ? 2 : 1)
, uid(0)
, gid(0)
, rdev(0)
{
}
@@ -225,6 +227,12 @@ class Inode {
mode = new_mode;
}
void set_rdev(dev_t new_rdev)
{
std::lock_guard<std::mutex> lock(attr_mutex);
rdev = new_rdev;
}
void set_atime(const struct timespec &_atime)
{
std::lock_guard<std::mutex> lock(attr_mutex);
@@ -258,6 +266,7 @@ class Inode {
stbuf->st_nlink = nlink;
stbuf->st_uid = uid;
stbuf->st_gid = gid;
stbuf->st_rdev = rdev;
stbuf->st_size = content.size();
stbuf->st_blocks = DIV_ROUND_UP(content.size(), 512);
stbuf->st_atime = atime;
@@ -883,6 +892,47 @@ static void memfs_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
fuse_reply_attr(req, &st, MEMFS_ATTR_TIMEOUT);
}
static void memfs_mknod(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode, dev_t rdev)
{
auto parentInode = Inodes.find(parent);
if (!parentInode || !parentInode->is_dir()) {
fuse_reply_err(req, ENOENT);
return;
}
if (parentInode->find_child(name)) {
fuse_reply_err(req, EEXIST);
return;
}
// mode already carries the type bits (S_IFREG/S_IFIFO/S_IFCHR/...)
auto new_inode = Inodes.create(name, false, mode);
if (!new_inode) {
fuse_reply_err(req, EIO);
return;
}
new_inode->set_rdev(rdev);
Dentry *new_dentry = new Dentry(name, new_inode);
int error = parentInode->add_child(name, new_dentry);
if (error != 0) {
delete new_dentry;
Inodes.erase(new_inode.get());
fuse_reply_err(req, error);
return;
}
struct fuse_entry_param e;
memset(&e, 0, sizeof(e));
e.ino = new_inode->get_ino();
e.attr_timeout = MEMFS_ATTR_TIMEOUT;
e.entry_timeout = MEMFS_ENTRY_TIMEOUT;
new_inode->get_attr(&e.attr);
fuse_reply_entry(req, &e);
}
static void memfs_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode)
{
@@ -1169,6 +1219,7 @@ static const struct fuse_lowlevel_ops memfs_oper = {
.forget = memfs_forget,
.getattr = memfs_getattr,
.setattr = memfs_setattr,
.mknod = memfs_mknod,
.mkdir = memfs_mkdir,
.unlink = memfs_unlink,
.rmdir = memfs_rmdir,