예제 #1
0
static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
				   struct nameidata *nd)
{
	struct inode *inode;
	ino_t ino;

	if (dentry->d_name.len > EXOFS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	ino = exofs_inode_by_name(dir, dentry);
	inode = ino ? exofs_iget(dir->i_sb, ino) : NULL;
	return d_splice_alias(inode, dentry);
}
예제 #2
0
static struct inode *exofs_nfs_get_inode(struct super_block *sb,
		u64 ino, u32 generation)
{
	struct inode *inode;

	inode = exofs_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
		/* we didn't find the right inode.. */
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
	return inode;
}
예제 #3
0
static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
				       unsigned table_count)
{
	struct exofs_sb_info *sbi = *psbi;
	struct osd_dev *fscb_od;
	struct osd_obj_id obj = {.partition = sbi->s_pid,
				 .id = EXOFS_DEVTABLE_ID};
	struct exofs_device_table *dt;
	unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
					     sizeof(*dt);
	unsigned numdevs, i;
	int ret;

	dt = kmalloc(table_bytes, GFP_KERNEL);
	if (unlikely(!dt)) {
		EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
			  table_bytes);
		return -ENOMEM;
	}

	fscb_od = sbi->s_ods[0];
	sbi->s_ods[0] = NULL;
	sbi->s_numdevs = 0;
	ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
	if (unlikely(ret)) {
		EXOFS_ERR("ERROR: reading device table\n");
		goto out;
	}

	numdevs = le64_to_cpu(dt->dt_num_devices);
	if (unlikely(!numdevs)) {
		ret = -EINVAL;
		goto out;
	}
	WARN_ON(table_count != numdevs);

	ret = _read_and_match_data_map(sbi, numdevs, dt);
	if (unlikely(ret))
		goto out;

	if (likely(numdevs > 1)) {
		unsigned size = numdevs * sizeof(sbi->s_ods[0]);

		sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
		if (unlikely(!sbi)) {
			ret = -ENOMEM;
			goto out;
		}
		memset(&sbi->s_ods[1], 0, size - sizeof(sbi->s_ods[0]));
		*psbi = sbi;
	}

	for (i = 0; i < numdevs; i++) {
		struct exofs_fscb fscb;
		struct osd_dev_info odi;
		struct osd_dev *od;

		if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
			EXOFS_ERR("ERROR: Read all-zeros device entry\n");
			ret = -EINVAL;
			goto out;
		}

		printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
		       i, odi.osdname);

		/* On all devices the device table is identical. The user can
		 * specify any one of the participating devices on the command
		 * line. We always keep them in device-table order.
		 */
		if (fscb_od && osduld_device_same(fscb_od, &odi)) {
			sbi->s_ods[i] = fscb_od;
			++sbi->s_numdevs;
			fscb_od = NULL;
			continue;
		}

		od = osduld_info_lookup(&odi);
		if (unlikely(IS_ERR(od))) {
			ret = PTR_ERR(od);
			EXOFS_ERR("ERROR: device requested is not found "
				  "osd_name-%s =>%d\n", odi.osdname, ret);
			goto out;
		}

		sbi->s_ods[i] = od;
		++sbi->s_numdevs;

		/* Read the fscb of the other devices to make sure the FS
		 * partition is there.
		 */
		ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
				      sizeof(fscb));
		if (unlikely(ret)) {
			EXOFS_ERR("ERROR: Malformed participating device "
				  "error reading fscb osd_name-%s\n",
				  odi.osdname);
			goto out;
		}

		/* TODO: verify other information is correct and FS-uuid
		 *	 matches. Benny what did you say about device table
		 *	 generation and old devices?
		 */
	}

out:
	kfree(dt);
	if (unlikely(!ret && fscb_od)) {
		EXOFS_ERR(
		      "ERROR: Bad device-table container device not present\n");
		osduld_put_device(fscb_od);
		ret = -EINVAL;
	}

	return ret;
}

/*
 * Read the superblock from the OSD and fill in the fields
 */
static int exofs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *root;
	struct exofs_mountopt *opts = data;
	struct exofs_sb_info *sbi;	/*extended info                  */
	struct osd_dev *od;		/* Master device                 */
	struct exofs_fscb fscb;		/*on-disk superblock info        */
	struct osd_obj_id obj;
	unsigned table_count;
	int ret;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	/* use mount options to fill superblock */
	od = osduld_path_lookup(opts->dev_name);
	if (IS_ERR(od)) {
		ret = PTR_ERR(od);
		goto free_sbi;
	}

	sbi->s_ods[0] = od;
	sbi->s_numdevs = 1;
	sbi->s_pid = opts->pid;
	sbi->s_timeout = opts->timeout;

	/* fill in some other data by hand */
	memset(sb->s_id, 0, sizeof(sb->s_id));
	strcpy(sb->s_id, "exofs");
	sb->s_blocksize = EXOFS_BLKSIZE;
	sb->s_blocksize_bits = EXOFS_BLKSHIFT;
	sb->s_maxbytes = MAX_LFS_FILESIZE;
	atomic_set(&sbi->s_curr_pending, 0);
	sb->s_bdev = NULL;
	sb->s_dev = 0;

	obj.partition = sbi->s_pid;
	obj.id = EXOFS_SUPER_ID;
	exofs_make_credential(sbi->s_cred, &obj);

	ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
	if (unlikely(ret))
		goto free_sbi;

	sb->s_magic = le16_to_cpu(fscb.s_magic);
	sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
	sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);

	/* make sure what we read from the object store is correct */
	if (sb->s_magic != EXOFS_SUPER_MAGIC) {
		if (!silent)
			EXOFS_ERR("ERROR: Bad magic value\n");
		ret = -EINVAL;
		goto free_sbi;
	}
	if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) {
		EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
			  EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
		ret = -EINVAL;
		goto free_sbi;
	}

	/* start generation numbers from a random point */
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

	table_count = le64_to_cpu(fscb.s_dev_table_count);
	if (table_count) {
		ret = exofs_read_lookup_dev_table(&sbi, table_count);
		if (unlikely(ret))
			goto free_sbi;
	}

	/* set up operation vectors */
	sb->s_fs_info = sbi;
	sb->s_op = &exofs_sops;
	sb->s_export_op = &exofs_export_ops;
	root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
	if (IS_ERR(root)) {
		EXOFS_ERR("ERROR: exofs_iget failed\n");
		ret = PTR_ERR(root);
		goto free_sbi;
	}
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		EXOFS_ERR("ERROR: get root inode failed\n");
		ret = -ENOMEM;
		goto free_sbi;
	}

	if (!S_ISDIR(root->i_mode)) {
		dput(sb->s_root);
		sb->s_root = NULL;
		EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
		       root->i_mode);
		ret = -EINVAL;
		goto free_sbi;
	}

	_exofs_print_device("Mounting", opts->dev_name, sbi->s_ods[0],
			    sbi->s_pid);
	return 0;

free_sbi:
	EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
		  opts->dev_name, sbi->s_pid, ret);
	exofs_free_sbi(sbi);
	return ret;
}

/*
 * Set up the superblock (calls exofs_fill_super eventually)
 */
static int exofs_get_sb(struct file_system_type *type,
			  int flags, const char *dev_name,
			  void *data, struct vfsmount *mnt)
{
	struct exofs_mountopt opts;
	int ret;

	ret = parse_options(data, &opts);
	if (ret)
		return ret;

	opts.dev_name = dev_name;
	return get_sb_nodev(type, flags, &opts, exofs_fill_super, mnt);
}

/*
 * Return information about the file system state in the buffer.  This is used
 * by the 'df' command, for example.
 */
static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct exofs_sb_info *sbi = sb->s_fs_info;
	struct exofs_io_state *ios;
	struct osd_attr attrs[] = {
		ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
			OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
		ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
			OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
	};
	uint64_t capacity = ULLONG_MAX;
	uint64_t used = ULLONG_MAX;
	uint8_t cred_a[OSD_CAP_LEN];
	int ret;

	ret = exofs_get_io_state(sbi, &ios);
	if (ret) {
		EXOFS_DBGMSG("exofs_get_io_state failed.\n");
		return ret;
	}

	exofs_make_credential(cred_a, &ios->obj);
	ios->cred = sbi->s_cred;
	ios->in_attr = attrs;
	ios->in_attr_len = ARRAY_SIZE(attrs);

	ret = exofs_sbi_read(ios);
	if (unlikely(ret))
		goto out;

	ret = extract_attr_from_ios(ios, &attrs[0]);
	if (likely(!ret)) {
		capacity = get_unaligned_be64(attrs[0].val_ptr);
		if (unlikely(!capacity))
			capacity = ULLONG_MAX;
	} else
		EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");

	ret = extract_attr_from_ios(ios, &attrs[1]);
	if (likely(!ret))
		used = get_unaligned_be64(attrs[1].val_ptr);
	else
		EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");

	/* fill in the stats buffer */
	buf->f_type = EXOFS_SUPER_MAGIC;
	buf->f_bsize = EXOFS_BLKSIZE;
	buf->f_blocks = capacity >> 9;
	buf->f_bfree = (capacity - used) >> 9;
	buf->f_bavail = buf->f_bfree;
	buf->f_files = sbi->s_numfiles;
	buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
	buf->f_namelen = EXOFS_NAME_LEN;

out:
	exofs_put_io_state(ios);
	return ret;
}

static const struct super_operations exofs_sops = {
	.alloc_inode    = exofs_alloc_inode,
	.destroy_inode  = exofs_destroy_inode,
	.write_inode    = exofs_write_inode,
	.delete_inode   = exofs_delete_inode,
	.put_super      = exofs_put_super,
	.write_super    = exofs_write_super,
	.sync_fs	= exofs_sync_fs,
	.statfs         = exofs_statfs,
};

/******************************************************************************
 * EXPORT OPERATIONS
 *****************************************************************************/

struct dentry *exofs_get_parent(struct dentry *child)
{
	unsigned long ino = exofs_parent_ino(child);

	if (!ino)
		return NULL;

	return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
}
예제 #4
0
static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
				   struct nameidata *nd)
{
	struct inode *inode;
	ino_t ino;

	if (dentry->d_name.len > EXOFS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	ino = exofs_inode_by_name(dir, dentry);
<<<<<<< HEAD
=======
<<<<<<< HEAD
>>>>>>> ae1773bb70f3d7cf73324ce8fba787e01d8fa9f2
	inode = ino ? exofs_iget(dir->i_sb, ino) : NULL;
	return d_splice_alias(inode, dentry);
}

static int exofs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
<<<<<<< HEAD
=======
=======
	inode = NULL;
	if (ino) {
		inode = exofs_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}
	return d_splice_alias(inode, dentry);
}