X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/21ffd87b228fa0bd0c25a09b710c6aeac8b81281..270869139db617e29a35bb9ded41087bb702f9ac:/lunaix-os/kernel/fs/mount.c

diff --git a/lunaix-os/kernel/fs/mount.c b/lunaix-os/kernel/fs/mount.c
index 3d4b0be..c5b7344 100644
--- a/lunaix-os/kernel/fs/mount.c
+++ b/lunaix-os/kernel/fs/mount.c
@@ -1,9 +1,15 @@
-#include <lunaix/fs.h>
+#include <lunaix/foptions.h>
+#include <lunaix/fs/api.h>
 #include <lunaix/mm/valloc.h>
 #include <lunaix/process.h>
+#include <lunaix/spike.h>
+#include <lunaix/syscall_utils.h>
+#include <lunaix/syslog.h>
 #include <lunaix/types.h>
 
-static struct llist_header all_mnts = { .next = &all_mnts, .prev = &all_mnts };
+LOG_MODULE("fs")
+
+struct llist_header all_mnts = { .next = &all_mnts, .prev = &all_mnts };
 
 struct v_mount*
 vfs_create_mount(struct v_mount* parent, struct v_dnode* mnt_point)
@@ -17,22 +23,37 @@ vfs_create_mount(struct v_mount* parent, struct v_dnode* mnt_point)
     llist_append(&all_mnts, &mnt->list);
     mutex_init(&mnt->lock);
 
-    mnt_mkbusy(parent);
     mnt->parent = parent;
     mnt->mnt_point = mnt_point;
-    mnt->super_block = mnt_point->super_block;
+    vfs_vmnt_assign_sb(mnt, mnt_point->super_block);
 
     if (parent) {
+        mnt_mkbusy(parent);
         mutex_lock(&mnt->parent->lock);
         llist_append(&parent->submnts, &mnt->sibmnts);
         mutex_unlock(&mnt->parent->lock);
     }
-
+    
     atomic_fetch_add(&mnt_point->ref_count, 1);
 
     return mnt;
 }
 
+void
+__vfs_release_vmnt(struct v_mount* mnt)
+{
+    assert(llist_empty(&mnt->submnts));
+
+    if (mnt->parent) {
+        mnt_chillax(mnt->parent);
+    }
+
+    llist_delete(&mnt->sibmnts);
+    llist_delete(&mnt->list);
+    atomic_fetch_sub(&mnt->mnt_point->ref_count, 1);
+    vfree(mnt);
+}
+
 int
 __vfs_do_unmount(struct v_mount* mnt)
 {
@@ -43,9 +64,6 @@ __vfs_do_unmount(struct v_mount* mnt)
         return errno;
     }
 
-    llist_delete(&mnt->list);
-    llist_delete(&mnt->sibmnts);
-
     // detached the inodes from cache, and let lru policy to recycle them
     for (size_t i = 0; i < VFS_HASHTABLE_SIZE; i++) {
         struct hbucket* bucket = &sb->i_cache[i];
@@ -55,11 +73,10 @@ __vfs_do_unmount(struct v_mount* mnt)
         bucket->head->pprev = 0;
     }
 
-    mnt_chillax(mnt->parent);
+    mnt->mnt_point->mnt = mnt->parent;
 
     vfs_sb_free(sb);
-    vfs_d_free(mnt->mnt_point);
-    vfree(mnt);
+    __vfs_release_vmnt(mnt);
 
     return errno;
 }
@@ -67,35 +84,42 @@ __vfs_do_unmount(struct v_mount* mnt)
 void
 mnt_mkbusy(struct v_mount* mnt)
 {
-    while (mnt) {
-        mutex_lock(&mnt->lock);
-        mnt->busy_counter++;
-        mutex_unlock(&mnt->lock);
-
-        mnt = mnt->parent;
-    }
+    mutex_lock(&mnt->lock);
+    mnt->busy_counter++;
+    mutex_unlock(&mnt->lock);
 }
 
 void
 mnt_chillax(struct v_mount* mnt)
 {
-    while (mnt) {
-        mutex_lock(&mnt->lock);
-        mnt->busy_counter--;
-        mutex_unlock(&mnt->lock);
+    mutex_lock(&mnt->lock);
+    mnt->busy_counter--;
+    mutex_unlock(&mnt->lock);
+}
 
-        mnt = mnt->parent;
+int
+vfs_mount_root(const char* fs_name, struct device* device)
+{
+    extern struct v_dnode* vfs_sysroot;
+    int errno = 0;
+    if (vfs_sysroot->mnt && (errno = vfs_unmount_at(vfs_sysroot))) {
+        return errno;
     }
+    return vfs_mount_at(fs_name, device, vfs_sysroot, 0);
 }
 
 int
-vfs_mount(const char* target, const char* fs_name, struct device* device)
+vfs_mount(const char* target,
+          const char* fs_name,
+          struct device* device,
+          int options)
 {
     int errno;
     struct v_dnode* mnt;
 
-    if (!(errno = vfs_walk(__current->cwd, target, &mnt, NULL, 0))) {
-        errno = vfs_mount_at(fs_name, device, mnt);
+    if (!(errno =
+            vfs_walk(__current->cwd, target, &mnt, NULL, VFS_WALK_MKPARENT))) {
+        errno = vfs_mount_at(fs_name, device, mnt, options);
     }
 
     return errno;
@@ -117,9 +141,14 @@ vfs_unmount(const char* target)
 int
 vfs_mount_at(const char* fs_name,
              struct device* device,
-             struct v_dnode* mnt_point)
+             struct v_dnode* mnt_point,
+             int options)
 {
-    if (mnt_point->inode && !(mnt_point->inode->itype & VFS_IFDIR)) {
+    if (device && device->dev_type != DEV_IFVOL) {
+        return ENOTBLK;
+    }
+
+    if (mnt_point->inode && !check_directory_node(mnt_point->inode)) {
         return ENOTDIR;
     }
 
@@ -128,22 +157,55 @@ vfs_mount_at(const char* fs_name,
         return ENODEV;
     }
 
+    if ((fs->types & FSTYPE_ROFS)) {
+        options |= MNT_RO;
+    }
+
+    if (!(fs->types & FSTYPE_PSEUDO) && !device) {
+        return ENODEV;
+    }
+
+    int errno = 0;
+    char* dev_name = "sys";
     struct v_mount* parent_mnt = mnt_point->mnt;
-    struct v_superblock* sb = vfs_sb_alloc();
+    struct v_superblock *sb = vfs_sb_alloc(), 
+                        *old_sb = mnt_point->super_block;
+
+    if (device) {
+        dev_name = device->name_val;
+    }
+
+    // prepare v_superblock for fs::mount invoke
     sb->dev = device;
+    sb->fs = fs;
+    sb->root = mnt_point;
+    vfs_d_assign_sb(mnt_point, sb);
 
-    int errno = 0;
-    if (!(errno = fs->mount(sb, mnt_point))) {
-        sb->fs = fs;
-        sb->root = mnt_point;
-        mnt_point->super_block = sb;
+    if (!(mnt_point->mnt = vfs_create_mount(parent_mnt, mnt_point))) {
+        errno = ENOMEM;
+        goto cleanup;
+    }
 
-        if (!(mnt_point->mnt = vfs_create_mount(parent_mnt, mnt_point))) {
-            errno = ENOMEM;
-            vfs_sb_free(sb);
-        }
+    mnt_point->mnt->flags = options;
+    if (!(errno = fs->mount(sb, mnt_point))) {
+        kprintf("mount: dev=%s, fs=%s, mode=%d", dev_name, fs_name, options);
+    } else {
+        goto cleanup;
     }
 
+    vfs_sb_free(old_sb);
+    return errno;
+
+cleanup:
+    ERROR("failed mount: dev=%s, fs=%s, mode=%d, err=%d",
+          dev_name,
+          fs_name,
+          options,
+          errno);
+    vfs_d_assign_sb(mnt_point, old_sb);
+    vfs_sb_free(sb);
+    __vfs_release_vmnt(mnt_point->mnt);
+
     return errno;
 }
 
@@ -170,3 +232,66 @@ vfs_unmount_at(struct v_dnode* mnt_point)
 
     return errno;
 }
+
+int
+vfs_check_writable(struct v_dnode* dnode)
+{
+    if ((dnode->mnt->flags & MNT_RO)) {
+        return EROFS;
+    }
+    return 0;
+}
+
+__DEFINE_LXSYSCALL4(int,
+                    mount,
+                    const char*,
+                    source,
+                    const char*,
+                    target,
+                    const char*,
+                    fstype,
+                    int,
+                    options)
+{
+    struct v_dnode *dev = NULL, *mnt = NULL;
+    int errno = 0;
+
+    // It is fine if source is not exist, as some mounting don't require it
+    vfs_walk(__current->cwd, source, &dev, NULL, 0);
+
+    if ((errno = vfs_walk(__current->cwd, target, &mnt, NULL, 0))) {
+        goto done;
+    }
+
+    if (mnt->ref_count > 1) {
+        errno = EBUSY;
+        goto done;
+    }
+
+    if (mnt->mnt->mnt_point == mnt) {
+        errno = EBUSY;
+        goto done;
+    }
+
+    // By our convention.
+    // XXX could we do better?
+    struct device* device = NULL;
+
+    if (dev) {
+        if (!check_voldev_node(dev->inode)) {
+            errno = ENOTDEV;
+            goto done;
+        }
+        device = (struct device*)dev->inode->data;
+    }
+
+    errno = vfs_mount_at(fstype, device, mnt, options);
+
+done:
+    return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL1(int, unmount, const char*, target)
+{
+    return vfs_unmount(target);
+}
\ No newline at end of file