we can do similar thing in Lunaix? A block device emulation
above the regular file when we mount it on.
10. (device) device number (dev_t) allocation
- [good idea] <class>:<subclass>:<uniq_id> composition
+ [good idea] <class>:<subclass>:<uniq_id> composition (CHECKED)
*/
#include <klibc/string.h>
-#include <lunaix/dirent.h>
#include <lunaix/foptions.h>
#include <lunaix/fs.h>
#include <lunaix/mm/cake.h>
#include <lunaix/process.h>
#include <lunaix/spike.h>
#include <lunaix/syscall.h>
+#include <lunaix/syscall_utils.h>
#include <lunaix/fs/twifs.h>
+#include <usr/lunaix/dirent_defs.h>
+
static struct cake_pile* dnode_pile;
static struct cake_pile* inode_pile;
static struct cake_pile* file_pile;
atomic_fetch_add(&vfs_sysroot->ref_count, 1);
}
-inline struct hbucket*
-__dcache_hash(struct v_dnode* parent, uint32_t* hash)
+static inline struct hbucket*
+__dcache_hash(struct v_dnode* parent, u32_t* hash)
{
- uint32_t _hash = *hash;
- // 与parent的指针值做加法，来减小碰撞的可能性。
- _hash += (uint32_t)parent;
+ u32_t _hash = *hash;
// 确保低位更加随机
_hash = _hash ^ (_hash >> VFS_HASHBITS);
+ // 与parent的指针值做加法，来减小碰撞的可能性。
+ _hash += (u32_t)parent;
*hash = _hash;
return &dnode_cache[_hash & VFS_HASH_MASK];
}
return parent->parent;
}
- uint32_t hash = str->hash;
+ u32_t hash = str->hash;
struct hbucket* slot = __dcache_hash(parent, &hash);
struct v_dnode *pos, *n;
assert(dnode->ref_count == 1);
llist_delete(&dnode->siblings);
+ llist_delete(&dnode->aka_list);
hlist_delete(&dnode->hash_list);
dnode->parent = NULL;
vfile->ref_count = ATOMIC_VAR_INIT(1);
vfile->ops = inode->default_fops;
- if ((inode->itype & VFS_IFFILE) && !inode->pg_cache) {
+ if ((inode->itype & F_MFILE) && !inode->pg_cache) {
struct pcache* pcache = vzalloc(sizeof(struct pcache));
pcache_init(pcache);
pcache->master = inode;
vfs_assign_inode(struct v_dnode* assign_to, struct v_inode* inode)
{
if (assign_to->inode) {
+ llist_delete(&assign_to->aka_list);
assign_to->inode->link_count--;
}
+ llist_append(&inode->aka_dnodes, &assign_to->aka_list);
assign_to->inode = inode;
inode->link_count++;
}
atomic_fetch_sub(&file->dnode->ref_count, 1);
file->inode->open_count--;
- // Prevent dead lock.
- // This happened when process is terminated while blocking on read.
- // In that case, the process is still holding the inode lock and it will
- // never get released.
/*
+ * Prevent dead lock.
+ * This happened when process is terminated while blocking on read.
+ * In that case, the process is still holding the inode lock and it
+ will never get released.
* The unlocking should also include ownership check.
*
* To see why, consider two process both open the same file both with
return vfs_pclose(file, __current->pid);
}
+void
+vfs_free_fd(struct v_fd* fd)
+{
+ cake_release(fd_pile, fd);
+}
+
int
vfs_fsync(struct v_file* file)
{
memset(dnode, 0, sizeof(*dnode));
llist_init_head(&dnode->children);
llist_init_head(&dnode->siblings);
+ llist_init_head(&dnode->aka_list);
mutex_init(&dnode->lock);
dnode->ref_count = ATOMIC_VAR_INIT(0);
vfs_dcache_remove(pos);
}
- vfree(dnode->name.value);
+ vfree((void*)dnode->name.value);
cake_release(dnode_pile, dnode);
}
struct v_inode*
-vfs_i_find(struct v_superblock* sb, uint32_t i_id)
+vfs_i_find(struct v_superblock* sb, u32_t i_id)
{
struct hbucket* slot = &sb->i_cache[i_id & VFS_HASH_MASK];
struct v_inode *pos, *n;
memset(inode, 0, sizeof(*inode));
mutex_init(&inode->lock);
llist_init_head(&inode->xattrs);
+ llist_init_head(&inode->aka_dnodes);
sb->ops.init_inode(sb, inode);
inode->atime = inode->ctime;
inode->mtime = inode->ctime;
-done:
lru_use_one(inode_lru, &inode->lru);
return inode;
}
pcache_release(inode->pg_cache);
vfree(inode->pg_cache);
}
- inode->ops->sync(inode);
+ // we don't need to sync inode.
+ // If an inode can be free, then it must be properly closed.
+ // Hence it must be synced already!
+ if (inode->destruct) {
+ inode->destruct(inode);
+ }
hlist_delete(&inode->hash_list);
cake_release(inode_pile, inode);
}
/* ---- System call definition and support ---- */
#define FLOCATE_CREATE_EMPTY 1
+#define FLOCATE_CREATE_ONLY 2
+#define FLOCATE_NOFOLLOW 4
int
vfs_getfd(int fd, struct v_fd** fd_s)
{
char name_str[VFS_NAME_MAXLEN];
struct hstr name = HSTR(name_str, 0);
- int errno;
+ int errno, woption = 0;
+
+ if ((options & FLOCATE_NOFOLLOW)) {
+ woption |= VFS_WALK_NOFOLLOW;
+ }
name_str[0] = 0;
- if ((errno = vfs_walk_proc(path, fdir, &name, VFS_WALK_PARENT))) {
+ if ((errno = vfs_walk_proc(path, fdir, &name, woption | VFS_WALK_PARENT))) {
return errno;
}
- errno = vfs_walk(*fdir, name.value, file, NULL, 0);
- if (errno != ENOENT || !(options & FLOCATE_CREATE_EMPTY)) {
+ errno = vfs_walk(*fdir, name.value, file, NULL, woption);
+
+ if (errno != ENOENT && (options & FLOCATE_CREATE_ONLY)) {
+ return EEXIST;
+ }
+
+ if (errno != ENOENT ||
+ !(options & (FLOCATE_CREATE_EMPTY | FLOCATE_CREATE_ONLY))) {
return errno;
}
int
vfs_do_open(const char* path, int options)
{
- int errno, fd;
+ int errno, fd, loptions = 0;
struct v_dnode *dentry, *file;
- struct v_file* ofile = 0;
-
- errno = __vfs_try_locate_file(
- path, &dentry, &file, (options & FO_CREATE) ? FLOCATE_CREATE_EMPTY : 0);
+ struct v_file* ofile = NULL;
- if (errno || (errno = vfs_open(file, &ofile))) {
- return errno;
+ if ((options & FO_CREATE)) {
+ loptions |= FLOCATE_CREATE_EMPTY;
+ } else if ((options & FO_NOFOLLOW)) {
+ loptions |= FLOCATE_NOFOLLOW;
}
- struct v_inode* o_inode = ofile->inode;
+ errno = __vfs_try_locate_file(path, &dentry, &file, loptions);
if (!errno && !(errno = vfs_alloc_fdslot(&fd))) {
- struct v_fd* fd_s = vzalloc(sizeof(*fd_s));
+
+ if (errno || (errno = vfs_open(file, &ofile))) {
+ return errno;
+ }
+
+ struct v_fd* fd_s = cake_grab(fd_pile);
+ memset(fd_s, 0, sizeof(*fd_s));
+
ofile->f_pos = ofile->inode->fsize & -((options & FO_APPEND) != 0);
fd_s->file = ofile;
fd_s->flags = options;
goto done_err;
}
- vfree(fd_s);
+ cake_release(fd_pile, fd_s);
__current->fdtable->fds[fd] = 0;
done_err:
const int len,
const int dtype)
{
- struct dirent* dent = (struct dirent*)dctx->cb_data;
+ struct lx_dirent* dent = (struct lx_dirent*)dctx->cb_data;
strncpy(dent->d_name, name, DIRENT_NAME_MAX_LEN);
dent->d_nlen = len;
dent->d_type = dtype;
}
-__DEFINE_LXSYSCALL2(int, readdir, int, fd, struct dirent*, dent)
+__DEFINE_LXSYSCALL2(int, sys_readdir, int, fd, struct lx_dirent*, dent)
{
struct v_fd* fd_s;
int errno;
lock_inode(inode);
- if (!(inode->itype & VFS_IFDIR)) {
+ if ((inode->itype & F_FILE)) {
errno = ENOTDIR;
} else {
- struct dir_context dctx =
- (struct dir_context){ .cb_data = dent,
- .index = dent->d_offset,
- .read_complete_callback =
- __vfs_readdir_callback };
+ struct dir_context dctx = (struct dir_context){
+ .cb_data = dent,
+ .index = dent->d_offset,
+ .read_complete_callback = __vfs_readdir_callback};
errno = 1;
if (dent->d_offset == 0) {
__vfs_readdir_callback(&dctx, vfs_dot.value, vfs_dot.len, DT_DIR);
}
struct v_file* file = fd_s->file;
- if ((file->inode->itype & VFS_IFDIR)) {
+ if (!(file->inode->itype & F_FILE)) {
errno = EISDIR;
goto done;
}
goto done;
}
- if ((file->inode->itype & VFS_IFDIR)) {
+ if (!(file->inode->itype & F_FILE)) {
errno = EISDIR;
goto done;
}
int fpos = file->f_pos;
switch (options) {
case FSEEK_CUR:
- overflow = __builtin_sadd_overflow((int)file->f_pos, offset, &fpos);
+ overflow = sadd_overflow((int)file->f_pos, offset, &fpos);
break;
case FSEEK_END:
- overflow =
- __builtin_sadd_overflow((int)file->inode->fsize, offset, &fpos);
+ overflow = sadd_overflow((int)file->inode->fsize, offset, &fpos);
break;
case FSEEK_SET:
fpos = offset;
int
vfs_get_dtype(int itype)
{
- switch (itype) {
- case VFS_IFDIR:
- return DT_DIR;
- case VFS_IFSYMLINK:
- return DT_SYMLINK;
- default:
- return DT_PIPE;
+ if ((itype & VFS_IFSYMLINK)) {
+ return DT_SYMLINK;
+ } else if (!(itype & VFS_IFFILE)) {
+ return DT_DIR;
+ } else {
+ return DT_FILE;
}
}
return DO_STATUS(errno);
}
-__DEFINE_LXSYSCALL4(int,
- readlinkat,
- int,
- dirfd,
- const char*,
- pathname,
- char*,
- buf,
- size_t,
- size)
+__DEFINE_LXSYSCALL4(
+ int, readlinkat, int, dirfd, const char*, pathname, char*, buf, size_t, size)
{
int errno;
struct v_fd* fd_s;
goto done;
}
+ pathname = pathname ? pathname : "";
+
struct v_dnode* dnode;
if (!(errno = vfs_walk(
fd_s->file->dnode, pathname, &dnode, NULL, VFS_WALK_NOFOLLOW))) {
lock_dnode(parent);
lock_inode(parent->inode);
- if ((dnode->inode->itype & VFS_IFDIR)) {
+ if (!(dnode->inode->itype & F_MFILE)) {
errno = parent->inode->ops->rmdir(parent->inode, dnode);
if (!errno) {
vfs_dcache_remove(dnode);
errno = ENOTSUP;
} else if (!parent->inode->ops->mkdir) {
errno = ENOTSUP;
- } else if (!(parent->inode->itype & VFS_IFDIR)) {
+ } else if ((parent->inode->itype & F_FILE)) {
errno = ENOTDIR;
} else if (!(errno = parent->inode->ops->mkdir(parent->inode, dir))) {
vfs_dcache_add(parent, dir);
if (inode->open_count) {
errno = EBUSY;
- } else if (!(inode->itype & VFS_IFDIR)) {
- // The underlying unlink implementation should handle
- // symlink case
+ } else if ((inode->itype & F_MFILE)) {
errno = inode->ops->unlink(inode);
if (!errno) {
vfs_d_free(dnode);
errno = __vfs_try_locate_file(oldpath, &dentry, &to_link, 0);
if (!errno) {
errno = __vfs_try_locate_file(
- newpath, &name_dentry, &name_file, FLOCATE_CREATE_EMPTY);
+ newpath, &name_dentry, &name_file, FLOCATE_CREATE_ONLY);
if (!errno) {
- errno = EEXIST;
- } else if (name_file) {
errno = vfs_link(to_link, name_file);
}
}
return DO_STATUS(errno);
}
-__DEFINE_LXSYSCALL2(int,
- symlink,
- const char*,
- pathname,
- const char*,
- link_target)
+__DEFINE_LXSYSCALL2(
+ int, symlink, const char*, pathname, const char*, link_target)
{
int errno;
- struct v_dnode* dnode;
- if ((errno = vfs_walk_proc(pathname, &dnode, NULL, 0))) {
+ struct v_dnode *dnode, *file;
+ if ((errno = __vfs_try_locate_file(
+ pathname, &dnode, &file, FLOCATE_CREATE_ONLY))) {
goto done;
}
- if (errno = vfs_check_writable(dnode)) {
+ if ((errno = vfs_check_writable(file))) {
goto done;
}
- if (!dnode->inode->ops->set_symlink) {
+ if (!file->inode->ops->set_symlink) {
errno = ENOTSUP;
goto done;
}
- lock_inode(dnode->inode);
+ lock_inode(file->inode);
- errno = dnode->inode->ops->set_symlink(dnode->inode, link_target);
+ errno = file->inode->ops->set_symlink(file->inode, link_target);
- unlock_inode(dnode->inode);
+ unlock_inode(file->inode);
done:
return DO_STATUS(errno);
}
+void
+vfs_ref_file(struct v_file* file)
+{
+ atomic_fetch_add(&file->ref_count, 1);
+}
+
void
vfs_ref_dnode(struct v_dnode* dnode)
{
atomic_fetch_add(&dnode->ref_count, 1);
- mnt_mkbusy(dnode->mnt);
+
+ if (dnode->mnt) {
+ mnt_mkbusy(dnode->mnt);
+ }
}
void
vfs_unref_dnode(struct v_dnode* dnode)
{
atomic_fetch_sub(&dnode->ref_count, 1);
- mnt_chillax(dnode->mnt);
+ if (dnode->mnt) {
+ mnt_chillax(dnode->mnt);
+ }
}
int
lock_dnode(dnode);
- if (!(dnode->inode->itype & VFS_IFDIR)) {
+ if ((dnode->inode->itype & F_FILE)) {
errno = ENOTDIR;
goto done;
}
goto done;
}
- errno = vfs_do_chdir(__current, dnode);
+ errno = vfs_do_chdir((struct proc_info*)__current, dnode);
done:
return DO_STATUS(errno);
goto done;
}
- errno = vfs_do_chdir(__current, fd_s->file->dnode);
+ errno = vfs_do_chdir((struct proc_info*)__current, fd_s->file->dnode);
done:
return DO_STATUS(errno);
}
}
- buf[len + 1] = '\0';
+ buf[len] = '\0';
ret_ptr = buf;
return 0;
}
- if (errno = vfs_check_writable(current)) {
+ if ((errno = vfs_check_writable(current))) {
return errno;
}
errno = vfs_do_rename(cur, target);
done:
- vfree(name.value);
+ vfree((void*)name.value);
+ return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL2(int, fstat, int, fd, struct file_stat*, stat)
+{
+ int errno = 0;
+ struct v_fd* fds;
+
+ if ((errno = vfs_getfd(fd, &fds))) {
+ goto done;
+ }
+
+ struct v_inode* vino = fds->file->inode;
+ struct device* fdev = vino->sb->dev;
+
+ *stat = (struct file_stat){.st_ino = vino->id,
+ .st_blocks = vino->lb_usage,
+ .st_size = vino->fsize,
+ .mode = vino->itype,
+ .st_ioblksize = PG_SIZE,
+ .st_blksize = vino->sb->blksize};
+
+ if (VFS_DEVFILE(vino->itype)) {
+ struct device* rdev = resolve_device(vino->data);
+ if (!rdev || rdev->magic != DEV_STRUCT_MAGIC) {
+ errno = EINVAL;
+ goto done;
+ }
+
+ stat->st_rdev = (dev_t){.meta = rdev->ident.fn_grp,
+ .unique = rdev->ident.unique,
+ .index = rdev->dev_uid};
+ }
+
+ if (fdev) {
+ stat->st_dev = (dev_t){.meta = fdev->ident.fn_grp,
+ .unique = fdev->ident.unique,
+ .index = fdev->dev_uid};
+ }
+
+done:
return DO_STATUS(errno);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff