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c3e946ce72
The functions rbd_get_dev() and rbd_put_dev() are trivial wrappers that add no value, and their existence suggests they may do more than what they do. Get rid of them. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Dan Mick <dan.mick@inktank.com>
3812 lines
89 KiB
C
3812 lines
89 KiB
C
/*
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rbd.c -- Export ceph rados objects as a Linux block device
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based on drivers/block/osdblk.c:
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Copyright 2009 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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For usage instructions, please refer to:
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Documentation/ABI/testing/sysfs-bus-rbd
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*/
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/osd_client.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/decode.h>
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#include <linux/parser.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include "rbd_types.h"
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#define RBD_DEBUG /* Activate rbd_assert() calls */
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/*
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* The basic unit of block I/O is a sector. It is interpreted in a
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* number of contexts in Linux (blk, bio, genhd), but the default is
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* universally 512 bytes. These symbols are just slightly more
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* meaningful than the bare numbers they represent.
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*/
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#define SECTOR_SHIFT 9
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#define SECTOR_SIZE (1ULL << SECTOR_SHIFT)
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/* It might be useful to have this defined elsewhere too */
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#define U64_MAX ((u64) (~0ULL))
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#define RBD_DRV_NAME "rbd"
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#define RBD_DRV_NAME_LONG "rbd (rados block device)"
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#define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */
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#define RBD_SNAP_DEV_NAME_PREFIX "snap_"
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#define RBD_MAX_SNAP_NAME_LEN \
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(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
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#define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */
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#define RBD_MAX_OPT_LEN 1024
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#define RBD_SNAP_HEAD_NAME "-"
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/* This allows a single page to hold an image name sent by OSD */
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#define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
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#define RBD_IMAGE_ID_LEN_MAX 64
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#define RBD_OBJ_PREFIX_LEN_MAX 64
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/* Feature bits */
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#define RBD_FEATURE_LAYERING 1
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/* Features supported by this (client software) implementation. */
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#define RBD_FEATURES_ALL (0)
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/*
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* An RBD device name will be "rbd#", where the "rbd" comes from
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* RBD_DRV_NAME above, and # is a unique integer identifier.
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* MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
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* enough to hold all possible device names.
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*/
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#define DEV_NAME_LEN 32
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#define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
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#define RBD_READ_ONLY_DEFAULT false
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/*
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* block device image metadata (in-memory version)
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*/
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struct rbd_image_header {
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/* These four fields never change for a given rbd image */
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char *object_prefix;
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u64 features;
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__u8 obj_order;
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__u8 crypt_type;
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__u8 comp_type;
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/* The remaining fields need to be updated occasionally */
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u64 image_size;
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struct ceph_snap_context *snapc;
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char *snap_names;
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u64 *snap_sizes;
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u64 obj_version;
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};
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/*
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* An rbd image specification.
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*
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* The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
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* identify an image.
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*/
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struct rbd_spec {
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u64 pool_id;
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char *pool_name;
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char *image_id;
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size_t image_id_len;
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char *image_name;
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size_t image_name_len;
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u64 snap_id;
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char *snap_name;
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struct kref kref;
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};
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struct rbd_options {
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bool read_only;
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};
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/*
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* an instance of the client. multiple devices may share an rbd client.
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*/
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struct rbd_client {
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struct ceph_client *client;
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struct kref kref;
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struct list_head node;
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};
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/*
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* a request completion status
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*/
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struct rbd_req_status {
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int done;
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int rc;
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u64 bytes;
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};
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/*
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* a collection of requests
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*/
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struct rbd_req_coll {
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int total;
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int num_done;
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struct kref kref;
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struct rbd_req_status status[0];
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};
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/*
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* a single io request
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*/
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struct rbd_request {
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struct request *rq; /* blk layer request */
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struct bio *bio; /* cloned bio */
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struct page **pages; /* list of used pages */
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u64 len;
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int coll_index;
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struct rbd_req_coll *coll;
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};
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struct rbd_snap {
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struct device dev;
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const char *name;
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u64 size;
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struct list_head node;
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u64 id;
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u64 features;
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};
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struct rbd_mapping {
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u64 size;
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u64 features;
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bool read_only;
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};
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/*
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* a single device
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*/
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struct rbd_device {
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int dev_id; /* blkdev unique id */
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int major; /* blkdev assigned major */
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struct gendisk *disk; /* blkdev's gendisk and rq */
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u32 image_format; /* Either 1 or 2 */
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struct rbd_client *rbd_client;
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char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
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spinlock_t lock; /* queue lock */
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struct rbd_image_header header;
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bool exists;
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struct rbd_spec *spec;
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char *header_name;
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struct ceph_osd_event *watch_event;
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struct ceph_osd_request *watch_request;
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struct rbd_spec *parent_spec;
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u64 parent_overlap;
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/* protects updating the header */
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struct rw_semaphore header_rwsem;
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struct rbd_mapping mapping;
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struct list_head node;
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/* list of snapshots */
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struct list_head snaps;
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/* sysfs related */
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struct device dev;
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unsigned long open_count;
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};
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static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */
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static LIST_HEAD(rbd_dev_list); /* devices */
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static DEFINE_SPINLOCK(rbd_dev_list_lock);
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static LIST_HEAD(rbd_client_list); /* clients */
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static DEFINE_SPINLOCK(rbd_client_list_lock);
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static int rbd_dev_snaps_update(struct rbd_device *rbd_dev);
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static int rbd_dev_snaps_register(struct rbd_device *rbd_dev);
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static void rbd_dev_release(struct device *dev);
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static void rbd_remove_snap_dev(struct rbd_snap *snap);
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static ssize_t rbd_add(struct bus_type *bus, const char *buf,
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size_t count);
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static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
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size_t count);
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static struct bus_attribute rbd_bus_attrs[] = {
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__ATTR(add, S_IWUSR, NULL, rbd_add),
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__ATTR(remove, S_IWUSR, NULL, rbd_remove),
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__ATTR_NULL
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};
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static struct bus_type rbd_bus_type = {
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.name = "rbd",
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.bus_attrs = rbd_bus_attrs,
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};
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static void rbd_root_dev_release(struct device *dev)
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{
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}
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static struct device rbd_root_dev = {
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.init_name = "rbd",
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.release = rbd_root_dev_release,
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};
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#ifdef RBD_DEBUG
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#define rbd_assert(expr) \
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if (unlikely(!(expr))) { \
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printk(KERN_ERR "\nAssertion failure in %s() " \
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"at line %d:\n\n" \
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"\trbd_assert(%s);\n\n", \
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__func__, __LINE__, #expr); \
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BUG(); \
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}
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#else /* !RBD_DEBUG */
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# define rbd_assert(expr) ((void) 0)
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#endif /* !RBD_DEBUG */
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static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver);
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static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver);
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static int rbd_open(struct block_device *bdev, fmode_t mode)
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{
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struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
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if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only)
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return -EROFS;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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(void) get_device(&rbd_dev->dev);
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set_device_ro(bdev, rbd_dev->mapping.read_only);
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rbd_dev->open_count++;
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mutex_unlock(&ctl_mutex);
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return 0;
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}
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static int rbd_release(struct gendisk *disk, fmode_t mode)
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{
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struct rbd_device *rbd_dev = disk->private_data;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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rbd_assert(rbd_dev->open_count > 0);
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rbd_dev->open_count--;
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put_device(&rbd_dev->dev);
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mutex_unlock(&ctl_mutex);
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return 0;
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}
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static const struct block_device_operations rbd_bd_ops = {
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.owner = THIS_MODULE,
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.open = rbd_open,
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.release = rbd_release,
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};
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/*
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* Initialize an rbd client instance.
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* We own *ceph_opts.
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*/
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static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
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{
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struct rbd_client *rbdc;
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int ret = -ENOMEM;
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dout("rbd_client_create\n");
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rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL);
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if (!rbdc)
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goto out_opt;
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kref_init(&rbdc->kref);
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INIT_LIST_HEAD(&rbdc->node);
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0);
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if (IS_ERR(rbdc->client))
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goto out_mutex;
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ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */
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ret = ceph_open_session(rbdc->client);
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if (ret < 0)
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goto out_err;
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spin_lock(&rbd_client_list_lock);
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list_add_tail(&rbdc->node, &rbd_client_list);
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spin_unlock(&rbd_client_list_lock);
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mutex_unlock(&ctl_mutex);
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dout("rbd_client_create created %p\n", rbdc);
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return rbdc;
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out_err:
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ceph_destroy_client(rbdc->client);
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out_mutex:
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mutex_unlock(&ctl_mutex);
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kfree(rbdc);
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out_opt:
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if (ceph_opts)
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ceph_destroy_options(ceph_opts);
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return ERR_PTR(ret);
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}
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/*
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* Find a ceph client with specific addr and configuration. If
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* found, bump its reference count.
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*/
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static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
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{
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struct rbd_client *client_node;
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bool found = false;
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if (ceph_opts->flags & CEPH_OPT_NOSHARE)
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return NULL;
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spin_lock(&rbd_client_list_lock);
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list_for_each_entry(client_node, &rbd_client_list, node) {
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if (!ceph_compare_options(ceph_opts, client_node->client)) {
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kref_get(&client_node->kref);
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found = true;
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break;
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}
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}
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spin_unlock(&rbd_client_list_lock);
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return found ? client_node : NULL;
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}
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/*
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* mount options
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*/
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enum {
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Opt_last_int,
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/* int args above */
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Opt_last_string,
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/* string args above */
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Opt_read_only,
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Opt_read_write,
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/* Boolean args above */
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Opt_last_bool,
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};
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static match_table_t rbd_opts_tokens = {
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/* int args above */
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/* string args above */
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{Opt_read_only, "read_only"},
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{Opt_read_only, "ro"}, /* Alternate spelling */
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{Opt_read_write, "read_write"},
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{Opt_read_write, "rw"}, /* Alternate spelling */
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/* Boolean args above */
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{-1, NULL}
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};
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static int parse_rbd_opts_token(char *c, void *private)
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{
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struct rbd_options *rbd_opts = private;
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substring_t argstr[MAX_OPT_ARGS];
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int token, intval, ret;
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token = match_token(c, rbd_opts_tokens, argstr);
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if (token < 0)
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return -EINVAL;
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if (token < Opt_last_int) {
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ret = match_int(&argstr[0], &intval);
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if (ret < 0) {
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pr_err("bad mount option arg (not int) "
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"at '%s'\n", c);
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return ret;
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}
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dout("got int token %d val %d\n", token, intval);
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} else if (token > Opt_last_int && token < Opt_last_string) {
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dout("got string token %d val %s\n", token,
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argstr[0].from);
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} else if (token > Opt_last_string && token < Opt_last_bool) {
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dout("got Boolean token %d\n", token);
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} else {
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dout("got token %d\n", token);
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}
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switch (token) {
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case Opt_read_only:
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rbd_opts->read_only = true;
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break;
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case Opt_read_write:
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rbd_opts->read_only = false;
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break;
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default:
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rbd_assert(false);
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break;
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}
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return 0;
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}
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/*
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* Get a ceph client with specific addr and configuration, if one does
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* not exist create it.
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*/
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static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts)
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{
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struct rbd_client *rbdc;
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rbdc = rbd_client_find(ceph_opts);
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if (rbdc) /* using an existing client */
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ceph_destroy_options(ceph_opts);
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else
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rbdc = rbd_client_create(ceph_opts);
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return rbdc;
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}
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/*
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* Destroy ceph client
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*
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* Caller must hold rbd_client_list_lock.
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*/
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static void rbd_client_release(struct kref *kref)
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{
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struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref);
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dout("rbd_release_client %p\n", rbdc);
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spin_lock(&rbd_client_list_lock);
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list_del(&rbdc->node);
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spin_unlock(&rbd_client_list_lock);
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ceph_destroy_client(rbdc->client);
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kfree(rbdc);
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}
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/*
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* Drop reference to ceph client node. If it's not referenced anymore, release
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* it.
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*/
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static void rbd_put_client(struct rbd_client *rbdc)
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{
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if (rbdc)
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kref_put(&rbdc->kref, rbd_client_release);
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}
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|
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/*
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* Destroy requests collection
|
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*/
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static void rbd_coll_release(struct kref *kref)
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{
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struct rbd_req_coll *coll =
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container_of(kref, struct rbd_req_coll, kref);
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dout("rbd_coll_release %p\n", coll);
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kfree(coll);
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}
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static bool rbd_image_format_valid(u32 image_format)
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{
|
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return image_format == 1 || image_format == 2;
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}
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|
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static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk)
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{
|
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size_t size;
|
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u32 snap_count;
|
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|
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/* The header has to start with the magic rbd header text */
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if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)))
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return false;
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|
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/* The bio layer requires at least sector-sized I/O */
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|
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if (ondisk->options.order < SECTOR_SHIFT)
|
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return false;
|
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|
|
/* If we use u64 in a few spots we may be able to loosen this */
|
|
|
|
if (ondisk->options.order > 8 * sizeof (int) - 1)
|
|
return false;
|
|
|
|
/*
|
|
* The size of a snapshot header has to fit in a size_t, and
|
|
* that limits the number of snapshots.
|
|
*/
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
size = SIZE_MAX - sizeof (struct ceph_snap_context);
|
|
if (snap_count > size / sizeof (__le64))
|
|
return false;
|
|
|
|
/*
|
|
* Not only that, but the size of the entire the snapshot
|
|
* header must also be representable in a size_t.
|
|
*/
|
|
size -= snap_count * sizeof (__le64);
|
|
if ((u64) size < le64_to_cpu(ondisk->snap_names_len))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Create a new header structure, translate header format from the on-disk
|
|
* header.
|
|
*/
|
|
static int rbd_header_from_disk(struct rbd_image_header *header,
|
|
struct rbd_image_header_ondisk *ondisk)
|
|
{
|
|
u32 snap_count;
|
|
size_t len;
|
|
size_t size;
|
|
u32 i;
|
|
|
|
memset(header, 0, sizeof (*header));
|
|
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
|
|
len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix));
|
|
header->object_prefix = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!header->object_prefix)
|
|
return -ENOMEM;
|
|
memcpy(header->object_prefix, ondisk->object_prefix, len);
|
|
header->object_prefix[len] = '\0';
|
|
|
|
if (snap_count) {
|
|
u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len);
|
|
|
|
/* Save a copy of the snapshot names */
|
|
|
|
if (snap_names_len > (u64) SIZE_MAX)
|
|
return -EIO;
|
|
header->snap_names = kmalloc(snap_names_len, GFP_KERNEL);
|
|
if (!header->snap_names)
|
|
goto out_err;
|
|
/*
|
|
* Note that rbd_dev_v1_header_read() guarantees
|
|
* the ondisk buffer we're working with has
|
|
* snap_names_len bytes beyond the end of the
|
|
* snapshot id array, this memcpy() is safe.
|
|
*/
|
|
memcpy(header->snap_names, &ondisk->snaps[snap_count],
|
|
snap_names_len);
|
|
|
|
/* Record each snapshot's size */
|
|
|
|
size = snap_count * sizeof (*header->snap_sizes);
|
|
header->snap_sizes = kmalloc(size, GFP_KERNEL);
|
|
if (!header->snap_sizes)
|
|
goto out_err;
|
|
for (i = 0; i < snap_count; i++)
|
|
header->snap_sizes[i] =
|
|
le64_to_cpu(ondisk->snaps[i].image_size);
|
|
} else {
|
|
WARN_ON(ondisk->snap_names_len);
|
|
header->snap_names = NULL;
|
|
header->snap_sizes = NULL;
|
|
}
|
|
|
|
header->features = 0; /* No features support in v1 images */
|
|
header->obj_order = ondisk->options.order;
|
|
header->crypt_type = ondisk->options.crypt_type;
|
|
header->comp_type = ondisk->options.comp_type;
|
|
|
|
/* Allocate and fill in the snapshot context */
|
|
|
|
header->image_size = le64_to_cpu(ondisk->image_size);
|
|
size = sizeof (struct ceph_snap_context);
|
|
size += snap_count * sizeof (header->snapc->snaps[0]);
|
|
header->snapc = kzalloc(size, GFP_KERNEL);
|
|
if (!header->snapc)
|
|
goto out_err;
|
|
|
|
atomic_set(&header->snapc->nref, 1);
|
|
header->snapc->seq = le64_to_cpu(ondisk->snap_seq);
|
|
header->snapc->num_snaps = snap_count;
|
|
for (i = 0; i < snap_count; i++)
|
|
header->snapc->snaps[i] =
|
|
le64_to_cpu(ondisk->snaps[i].id);
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
kfree(header->snap_sizes);
|
|
header->snap_sizes = NULL;
|
|
kfree(header->snap_names);
|
|
header->snap_names = NULL;
|
|
kfree(header->object_prefix);
|
|
header->object_prefix = NULL;
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
|
|
{
|
|
struct rbd_snap *snap;
|
|
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return RBD_SNAP_HEAD_NAME;
|
|
|
|
list_for_each_entry(snap, &rbd_dev->snaps, node)
|
|
if (snap_id == snap->id)
|
|
return snap->name;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name)
|
|
{
|
|
|
|
struct rbd_snap *snap;
|
|
|
|
list_for_each_entry(snap, &rbd_dev->snaps, node) {
|
|
if (!strcmp(snap_name, snap->name)) {
|
|
rbd_dev->spec->snap_id = snap->id;
|
|
rbd_dev->mapping.size = snap->size;
|
|
rbd_dev->mapping.features = snap->features;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int rbd_dev_set_mapping(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME,
|
|
sizeof (RBD_SNAP_HEAD_NAME))) {
|
|
rbd_dev->spec->snap_id = CEPH_NOSNAP;
|
|
rbd_dev->mapping.size = rbd_dev->header.image_size;
|
|
rbd_dev->mapping.features = rbd_dev->header.features;
|
|
ret = 0;
|
|
} else {
|
|
ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name);
|
|
if (ret < 0)
|
|
goto done;
|
|
rbd_dev->mapping.read_only = true;
|
|
}
|
|
rbd_dev->exists = true;
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_header_free(struct rbd_image_header *header)
|
|
{
|
|
kfree(header->object_prefix);
|
|
header->object_prefix = NULL;
|
|
kfree(header->snap_sizes);
|
|
header->snap_sizes = NULL;
|
|
kfree(header->snap_names);
|
|
header->snap_names = NULL;
|
|
ceph_put_snap_context(header->snapc);
|
|
header->snapc = NULL;
|
|
}
|
|
|
|
static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
|
|
{
|
|
char *name;
|
|
u64 segment;
|
|
int ret;
|
|
|
|
name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO);
|
|
if (!name)
|
|
return NULL;
|
|
segment = offset >> rbd_dev->header.obj_order;
|
|
ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx",
|
|
rbd_dev->header.object_prefix, segment);
|
|
if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) {
|
|
pr_err("error formatting segment name for #%llu (%d)\n",
|
|
segment, ret);
|
|
kfree(name);
|
|
name = NULL;
|
|
}
|
|
|
|
return name;
|
|
}
|
|
|
|
static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset)
|
|
{
|
|
u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;
|
|
|
|
return offset & (segment_size - 1);
|
|
}
|
|
|
|
static u64 rbd_segment_length(struct rbd_device *rbd_dev,
|
|
u64 offset, u64 length)
|
|
{
|
|
u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;
|
|
|
|
offset &= segment_size - 1;
|
|
|
|
rbd_assert(length <= U64_MAX - offset);
|
|
if (offset + length > segment_size)
|
|
length = segment_size - offset;
|
|
|
|
return length;
|
|
}
|
|
|
|
static int rbd_get_num_segments(struct rbd_image_header *header,
|
|
u64 ofs, u64 len)
|
|
{
|
|
u64 start_seg;
|
|
u64 end_seg;
|
|
|
|
if (!len)
|
|
return 0;
|
|
if (len - 1 > U64_MAX - ofs)
|
|
return -ERANGE;
|
|
|
|
start_seg = ofs >> header->obj_order;
|
|
end_seg = (ofs + len - 1) >> header->obj_order;
|
|
|
|
return end_seg - start_seg + 1;
|
|
}
|
|
|
|
/*
|
|
* returns the size of an object in the image
|
|
*/
|
|
static u64 rbd_obj_bytes(struct rbd_image_header *header)
|
|
{
|
|
return 1 << header->obj_order;
|
|
}
|
|
|
|
/*
|
|
* bio helpers
|
|
*/
|
|
|
|
static void bio_chain_put(struct bio *chain)
|
|
{
|
|
struct bio *tmp;
|
|
|
|
while (chain) {
|
|
tmp = chain;
|
|
chain = chain->bi_next;
|
|
bio_put(tmp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* zeros a bio chain, starting at specific offset
|
|
*/
|
|
static void zero_bio_chain(struct bio *chain, int start_ofs)
|
|
{
|
|
struct bio_vec *bv;
|
|
unsigned long flags;
|
|
void *buf;
|
|
int i;
|
|
int pos = 0;
|
|
|
|
while (chain) {
|
|
bio_for_each_segment(bv, chain, i) {
|
|
if (pos + bv->bv_len > start_ofs) {
|
|
int remainder = max(start_ofs - pos, 0);
|
|
buf = bvec_kmap_irq(bv, &flags);
|
|
memset(buf + remainder, 0,
|
|
bv->bv_len - remainder);
|
|
bvec_kunmap_irq(buf, &flags);
|
|
}
|
|
pos += bv->bv_len;
|
|
}
|
|
|
|
chain = chain->bi_next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clone a portion of a bio, starting at the given byte offset
|
|
* and continuing for the number of bytes indicated.
|
|
*/
|
|
static struct bio *bio_clone_range(struct bio *bio_src,
|
|
unsigned int offset,
|
|
unsigned int len,
|
|
gfp_t gfpmask)
|
|
{
|
|
struct bio_vec *bv;
|
|
unsigned int resid;
|
|
unsigned short idx;
|
|
unsigned int voff;
|
|
unsigned short end_idx;
|
|
unsigned short vcnt;
|
|
struct bio *bio;
|
|
|
|
/* Handle the easy case for the caller */
|
|
|
|
if (!offset && len == bio_src->bi_size)
|
|
return bio_clone(bio_src, gfpmask);
|
|
|
|
if (WARN_ON_ONCE(!len))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(len > bio_src->bi_size))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(offset > bio_src->bi_size - len))
|
|
return NULL;
|
|
|
|
/* Find first affected segment... */
|
|
|
|
resid = offset;
|
|
__bio_for_each_segment(bv, bio_src, idx, 0) {
|
|
if (resid < bv->bv_len)
|
|
break;
|
|
resid -= bv->bv_len;
|
|
}
|
|
voff = resid;
|
|
|
|
/* ...and the last affected segment */
|
|
|
|
resid += len;
|
|
__bio_for_each_segment(bv, bio_src, end_idx, idx) {
|
|
if (resid <= bv->bv_len)
|
|
break;
|
|
resid -= bv->bv_len;
|
|
}
|
|
vcnt = end_idx - idx + 1;
|
|
|
|
/* Build the clone */
|
|
|
|
bio = bio_alloc(gfpmask, (unsigned int) vcnt);
|
|
if (!bio)
|
|
return NULL; /* ENOMEM */
|
|
|
|
bio->bi_bdev = bio_src->bi_bdev;
|
|
bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT);
|
|
bio->bi_rw = bio_src->bi_rw;
|
|
bio->bi_flags |= 1 << BIO_CLONED;
|
|
|
|
/*
|
|
* Copy over our part of the bio_vec, then update the first
|
|
* and last (or only) entries.
|
|
*/
|
|
memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx],
|
|
vcnt * sizeof (struct bio_vec));
|
|
bio->bi_io_vec[0].bv_offset += voff;
|
|
if (vcnt > 1) {
|
|
bio->bi_io_vec[0].bv_len -= voff;
|
|
bio->bi_io_vec[vcnt - 1].bv_len = resid;
|
|
} else {
|
|
bio->bi_io_vec[0].bv_len = len;
|
|
}
|
|
|
|
bio->bi_vcnt = vcnt;
|
|
bio->bi_size = len;
|
|
bio->bi_idx = 0;
|
|
|
|
return bio;
|
|
}
|
|
|
|
/*
|
|
* Clone a portion of a bio chain, starting at the given byte offset
|
|
* into the first bio in the source chain and continuing for the
|
|
* number of bytes indicated. The result is another bio chain of
|
|
* exactly the given length, or a null pointer on error.
|
|
*
|
|
* The bio_src and offset parameters are both in-out. On entry they
|
|
* refer to the first source bio and the offset into that bio where
|
|
* the start of data to be cloned is located.
|
|
*
|
|
* On return, bio_src is updated to refer to the bio in the source
|
|
* chain that contains first un-cloned byte, and *offset will
|
|
* contain the offset of that byte within that bio.
|
|
*/
|
|
static struct bio *bio_chain_clone_range(struct bio **bio_src,
|
|
unsigned int *offset,
|
|
unsigned int len,
|
|
gfp_t gfpmask)
|
|
{
|
|
struct bio *bi = *bio_src;
|
|
unsigned int off = *offset;
|
|
struct bio *chain = NULL;
|
|
struct bio **end;
|
|
|
|
/* Build up a chain of clone bios up to the limit */
|
|
|
|
if (!bi || off >= bi->bi_size || !len)
|
|
return NULL; /* Nothing to clone */
|
|
|
|
end = &chain;
|
|
while (len) {
|
|
unsigned int bi_size;
|
|
struct bio *bio;
|
|
|
|
if (!bi)
|
|
goto out_err; /* EINVAL; ran out of bio's */
|
|
bi_size = min_t(unsigned int, bi->bi_size - off, len);
|
|
bio = bio_clone_range(bi, off, bi_size, gfpmask);
|
|
if (!bio)
|
|
goto out_err; /* ENOMEM */
|
|
|
|
*end = bio;
|
|
end = &bio->bi_next;
|
|
|
|
off += bi_size;
|
|
if (off == bi->bi_size) {
|
|
bi = bi->bi_next;
|
|
off = 0;
|
|
}
|
|
len -= bi_size;
|
|
}
|
|
*bio_src = bi;
|
|
*offset = off;
|
|
|
|
return chain;
|
|
out_err:
|
|
bio_chain_put(chain);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* helpers for osd request op vectors.
|
|
*/
|
|
static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops,
|
|
int opcode, u32 payload_len)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
|
|
ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO);
|
|
if (!ops)
|
|
return NULL;
|
|
|
|
ops[0].op = opcode;
|
|
|
|
/*
|
|
* op extent offset and length will be set later on
|
|
* in calc_raw_layout()
|
|
*/
|
|
ops[0].payload_len = payload_len;
|
|
|
|
return ops;
|
|
}
|
|
|
|
static void rbd_destroy_ops(struct ceph_osd_req_op *ops)
|
|
{
|
|
kfree(ops);
|
|
}
|
|
|
|
static void rbd_coll_end_req_index(struct request *rq,
|
|
struct rbd_req_coll *coll,
|
|
int index,
|
|
int ret, u64 len)
|
|
{
|
|
struct request_queue *q;
|
|
int min, max, i;
|
|
|
|
dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n",
|
|
coll, index, ret, (unsigned long long) len);
|
|
|
|
if (!rq)
|
|
return;
|
|
|
|
if (!coll) {
|
|
blk_end_request(rq, ret, len);
|
|
return;
|
|
}
|
|
|
|
q = rq->q;
|
|
|
|
spin_lock_irq(q->queue_lock);
|
|
coll->status[index].done = 1;
|
|
coll->status[index].rc = ret;
|
|
coll->status[index].bytes = len;
|
|
max = min = coll->num_done;
|
|
while (max < coll->total && coll->status[max].done)
|
|
max++;
|
|
|
|
for (i = min; i<max; i++) {
|
|
__blk_end_request(rq, coll->status[i].rc,
|
|
coll->status[i].bytes);
|
|
coll->num_done++;
|
|
kref_put(&coll->kref, rbd_coll_release);
|
|
}
|
|
spin_unlock_irq(q->queue_lock);
|
|
}
|
|
|
|
static void rbd_coll_end_req(struct rbd_request *req,
|
|
int ret, u64 len)
|
|
{
|
|
rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len);
|
|
}
|
|
|
|
/*
|
|
* Send ceph osd request
|
|
*/
|
|
static int rbd_do_request(struct request *rq,
|
|
struct rbd_device *rbd_dev,
|
|
struct ceph_snap_context *snapc,
|
|
u64 snapid,
|
|
const char *object_name, u64 ofs, u64 len,
|
|
struct bio *bio,
|
|
struct page **pages,
|
|
int num_pages,
|
|
int flags,
|
|
struct ceph_osd_req_op *ops,
|
|
struct rbd_req_coll *coll,
|
|
int coll_index,
|
|
void (*rbd_cb)(struct ceph_osd_request *req,
|
|
struct ceph_msg *msg),
|
|
struct ceph_osd_request **linger_req,
|
|
u64 *ver)
|
|
{
|
|
struct ceph_osd_request *req;
|
|
struct ceph_file_layout *layout;
|
|
int ret;
|
|
u64 bno;
|
|
struct timespec mtime = CURRENT_TIME;
|
|
struct rbd_request *req_data;
|
|
struct ceph_osd_request_head *reqhead;
|
|
struct ceph_osd_client *osdc;
|
|
|
|
req_data = kzalloc(sizeof(*req_data), GFP_NOIO);
|
|
if (!req_data) {
|
|
if (coll)
|
|
rbd_coll_end_req_index(rq, coll, coll_index,
|
|
-ENOMEM, len);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (coll) {
|
|
req_data->coll = coll;
|
|
req_data->coll_index = coll_index;
|
|
}
|
|
|
|
dout("rbd_do_request object_name=%s ofs=%llu len=%llu coll=%p[%d]\n",
|
|
object_name, (unsigned long long) ofs,
|
|
(unsigned long long) len, coll, coll_index);
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
req = ceph_osdc_alloc_request(osdc, flags, snapc, ops,
|
|
false, GFP_NOIO, pages, bio);
|
|
if (!req) {
|
|
ret = -ENOMEM;
|
|
goto done_pages;
|
|
}
|
|
|
|
req->r_callback = rbd_cb;
|
|
|
|
req_data->rq = rq;
|
|
req_data->bio = bio;
|
|
req_data->pages = pages;
|
|
req_data->len = len;
|
|
|
|
req->r_priv = req_data;
|
|
|
|
reqhead = req->r_request->front.iov_base;
|
|
reqhead->snapid = cpu_to_le64(CEPH_NOSNAP);
|
|
|
|
strncpy(req->r_oid, object_name, sizeof(req->r_oid));
|
|
req->r_oid_len = strlen(req->r_oid);
|
|
|
|
layout = &req->r_file_layout;
|
|
memset(layout, 0, sizeof(*layout));
|
|
layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
|
|
layout->fl_stripe_count = cpu_to_le32(1);
|
|
layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
|
|
layout->fl_pg_pool = cpu_to_le32((int) rbd_dev->spec->pool_id);
|
|
ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno,
|
|
req, ops);
|
|
rbd_assert(ret == 0);
|
|
|
|
ceph_osdc_build_request(req, ofs, &len,
|
|
ops,
|
|
snapc,
|
|
&mtime,
|
|
req->r_oid, req->r_oid_len);
|
|
|
|
if (linger_req) {
|
|
ceph_osdc_set_request_linger(osdc, req);
|
|
*linger_req = req;
|
|
}
|
|
|
|
ret = ceph_osdc_start_request(osdc, req, false);
|
|
if (ret < 0)
|
|
goto done_err;
|
|
|
|
if (!rbd_cb) {
|
|
ret = ceph_osdc_wait_request(osdc, req);
|
|
if (ver)
|
|
*ver = le64_to_cpu(req->r_reassert_version.version);
|
|
dout("reassert_ver=%llu\n",
|
|
(unsigned long long)
|
|
le64_to_cpu(req->r_reassert_version.version));
|
|
ceph_osdc_put_request(req);
|
|
}
|
|
return ret;
|
|
|
|
done_err:
|
|
bio_chain_put(req_data->bio);
|
|
ceph_osdc_put_request(req);
|
|
done_pages:
|
|
rbd_coll_end_req(req_data, ret, len);
|
|
kfree(req_data);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Ceph osd op callback
|
|
*/
|
|
static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
|
|
{
|
|
struct rbd_request *req_data = req->r_priv;
|
|
struct ceph_osd_reply_head *replyhead;
|
|
struct ceph_osd_op *op;
|
|
__s32 rc;
|
|
u64 bytes;
|
|
int read_op;
|
|
|
|
/* parse reply */
|
|
replyhead = msg->front.iov_base;
|
|
WARN_ON(le32_to_cpu(replyhead->num_ops) == 0);
|
|
op = (void *)(replyhead + 1);
|
|
rc = le32_to_cpu(replyhead->result);
|
|
bytes = le64_to_cpu(op->extent.length);
|
|
read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ);
|
|
|
|
dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n",
|
|
(unsigned long long) bytes, read_op, (int) rc);
|
|
|
|
if (rc == -ENOENT && read_op) {
|
|
zero_bio_chain(req_data->bio, 0);
|
|
rc = 0;
|
|
} else if (rc == 0 && read_op && bytes < req_data->len) {
|
|
zero_bio_chain(req_data->bio, bytes);
|
|
bytes = req_data->len;
|
|
}
|
|
|
|
rbd_coll_end_req(req_data, rc, bytes);
|
|
|
|
if (req_data->bio)
|
|
bio_chain_put(req_data->bio);
|
|
|
|
ceph_osdc_put_request(req);
|
|
kfree(req_data);
|
|
}
|
|
|
|
static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
|
|
{
|
|
ceph_osdc_put_request(req);
|
|
}
|
|
|
|
/*
|
|
* Do a synchronous ceph osd operation
|
|
*/
|
|
static int rbd_req_sync_op(struct rbd_device *rbd_dev,
|
|
struct ceph_snap_context *snapc,
|
|
u64 snapid,
|
|
int flags,
|
|
struct ceph_osd_req_op *ops,
|
|
const char *object_name,
|
|
u64 ofs, u64 inbound_size,
|
|
char *inbound,
|
|
struct ceph_osd_request **linger_req,
|
|
u64 *ver)
|
|
{
|
|
int ret;
|
|
struct page **pages;
|
|
int num_pages;
|
|
|
|
rbd_assert(ops != NULL);
|
|
|
|
num_pages = calc_pages_for(ofs, inbound_size);
|
|
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
|
|
if (IS_ERR(pages))
|
|
return PTR_ERR(pages);
|
|
|
|
ret = rbd_do_request(NULL, rbd_dev, snapc, snapid,
|
|
object_name, ofs, inbound_size, NULL,
|
|
pages, num_pages,
|
|
flags,
|
|
ops,
|
|
NULL, 0,
|
|
NULL,
|
|
linger_req, ver);
|
|
if (ret < 0)
|
|
goto done;
|
|
|
|
if ((flags & CEPH_OSD_FLAG_READ) && inbound)
|
|
ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret);
|
|
|
|
done:
|
|
ceph_release_page_vector(pages, num_pages);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Do an asynchronous ceph osd operation
|
|
*/
|
|
static int rbd_do_op(struct request *rq,
|
|
struct rbd_device *rbd_dev,
|
|
struct ceph_snap_context *snapc,
|
|
u64 ofs, u64 len,
|
|
struct bio *bio,
|
|
struct rbd_req_coll *coll,
|
|
int coll_index)
|
|
{
|
|
char *seg_name;
|
|
u64 seg_ofs;
|
|
u64 seg_len;
|
|
int ret;
|
|
struct ceph_osd_req_op *ops;
|
|
u32 payload_len;
|
|
int opcode;
|
|
int flags;
|
|
u64 snapid;
|
|
|
|
seg_name = rbd_segment_name(rbd_dev, ofs);
|
|
if (!seg_name)
|
|
return -ENOMEM;
|
|
seg_len = rbd_segment_length(rbd_dev, ofs, len);
|
|
seg_ofs = rbd_segment_offset(rbd_dev, ofs);
|
|
|
|
if (rq_data_dir(rq) == WRITE) {
|
|
opcode = CEPH_OSD_OP_WRITE;
|
|
flags = CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK;
|
|
snapid = CEPH_NOSNAP;
|
|
payload_len = seg_len;
|
|
} else {
|
|
opcode = CEPH_OSD_OP_READ;
|
|
flags = CEPH_OSD_FLAG_READ;
|
|
snapc = NULL;
|
|
snapid = rbd_dev->spec->snap_id;
|
|
payload_len = 0;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
ops = rbd_create_rw_ops(1, opcode, payload_len);
|
|
if (!ops)
|
|
goto done;
|
|
|
|
/* we've taken care of segment sizes earlier when we
|
|
cloned the bios. We should never have a segment
|
|
truncated at this point */
|
|
rbd_assert(seg_len == len);
|
|
|
|
ret = rbd_do_request(rq, rbd_dev, snapc, snapid,
|
|
seg_name, seg_ofs, seg_len,
|
|
bio,
|
|
NULL, 0,
|
|
flags,
|
|
ops,
|
|
coll, coll_index,
|
|
rbd_req_cb, 0, NULL);
|
|
|
|
rbd_destroy_ops(ops);
|
|
done:
|
|
kfree(seg_name);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Request sync osd read
|
|
*/
|
|
static int rbd_req_sync_read(struct rbd_device *rbd_dev,
|
|
u64 snapid,
|
|
const char *object_name,
|
|
u64 ofs, u64 len,
|
|
char *buf,
|
|
u64 *ver)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
int ret;
|
|
|
|
ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_req_sync_op(rbd_dev, NULL,
|
|
snapid,
|
|
CEPH_OSD_FLAG_READ,
|
|
ops, object_name, ofs, len, buf, NULL, ver);
|
|
rbd_destroy_ops(ops);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Request sync osd watch
|
|
*/
|
|
static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev,
|
|
u64 ver,
|
|
u64 notify_id)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
int ret;
|
|
|
|
ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
ops[0].watch.ver = cpu_to_le64(ver);
|
|
ops[0].watch.cookie = notify_id;
|
|
ops[0].watch.flag = 0;
|
|
|
|
ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP,
|
|
rbd_dev->header_name, 0, 0, NULL,
|
|
NULL, 0,
|
|
CEPH_OSD_FLAG_READ,
|
|
ops,
|
|
NULL, 0,
|
|
rbd_simple_req_cb, 0, NULL);
|
|
|
|
rbd_destroy_ops(ops);
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
|
|
{
|
|
struct rbd_device *rbd_dev = (struct rbd_device *)data;
|
|
u64 hver;
|
|
int rc;
|
|
|
|
if (!rbd_dev)
|
|
return;
|
|
|
|
dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n",
|
|
rbd_dev->header_name, (unsigned long long) notify_id,
|
|
(unsigned int) opcode);
|
|
rc = rbd_dev_refresh(rbd_dev, &hver);
|
|
if (rc)
|
|
pr_warning(RBD_DRV_NAME "%d got notification but failed to "
|
|
" update snaps: %d\n", rbd_dev->major, rc);
|
|
|
|
rbd_req_sync_notify_ack(rbd_dev, hver, notify_id);
|
|
}
|
|
|
|
/*
|
|
* Request sync osd watch
|
|
*/
|
|
static int rbd_req_sync_watch(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
int ret;
|
|
|
|
ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
|
|
(void *)rbd_dev, &rbd_dev->watch_event);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version);
|
|
ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
|
|
ops[0].watch.flag = 1;
|
|
|
|
ret = rbd_req_sync_op(rbd_dev, NULL,
|
|
CEPH_NOSNAP,
|
|
CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
|
|
ops,
|
|
rbd_dev->header_name,
|
|
0, 0, NULL,
|
|
&rbd_dev->watch_request, NULL);
|
|
|
|
if (ret < 0)
|
|
goto fail_event;
|
|
|
|
rbd_destroy_ops(ops);
|
|
return 0;
|
|
|
|
fail_event:
|
|
ceph_osdc_cancel_event(rbd_dev->watch_event);
|
|
rbd_dev->watch_event = NULL;
|
|
fail:
|
|
rbd_destroy_ops(ops);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Request sync osd unwatch
|
|
*/
|
|
static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
int ret;
|
|
|
|
ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
ops[0].watch.ver = 0;
|
|
ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
|
|
ops[0].watch.flag = 0;
|
|
|
|
ret = rbd_req_sync_op(rbd_dev, NULL,
|
|
CEPH_NOSNAP,
|
|
CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
|
|
ops,
|
|
rbd_dev->header_name,
|
|
0, 0, NULL, NULL, NULL);
|
|
|
|
|
|
rbd_destroy_ops(ops);
|
|
ceph_osdc_cancel_event(rbd_dev->watch_event);
|
|
rbd_dev->watch_event = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Synchronous osd object method call
|
|
*/
|
|
static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
|
|
const char *object_name,
|
|
const char *class_name,
|
|
const char *method_name,
|
|
const char *outbound,
|
|
size_t outbound_size,
|
|
char *inbound,
|
|
size_t inbound_size,
|
|
int flags,
|
|
u64 *ver)
|
|
{
|
|
struct ceph_osd_req_op *ops;
|
|
int class_name_len = strlen(class_name);
|
|
int method_name_len = strlen(method_name);
|
|
int payload_size;
|
|
int ret;
|
|
|
|
/*
|
|
* Any input parameters required by the method we're calling
|
|
* will be sent along with the class and method names as
|
|
* part of the message payload. That data and its size are
|
|
* supplied via the indata and indata_len fields (named from
|
|
* the perspective of the server side) in the OSD request
|
|
* operation.
|
|
*/
|
|
payload_size = class_name_len + method_name_len + outbound_size;
|
|
ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size);
|
|
if (!ops)
|
|
return -ENOMEM;
|
|
|
|
ops[0].cls.class_name = class_name;
|
|
ops[0].cls.class_len = (__u8) class_name_len;
|
|
ops[0].cls.method_name = method_name;
|
|
ops[0].cls.method_len = (__u8) method_name_len;
|
|
ops[0].cls.argc = 0;
|
|
ops[0].cls.indata = outbound;
|
|
ops[0].cls.indata_len = outbound_size;
|
|
|
|
ret = rbd_req_sync_op(rbd_dev, NULL,
|
|
CEPH_NOSNAP,
|
|
flags, ops,
|
|
object_name, 0, inbound_size, inbound,
|
|
NULL, ver);
|
|
|
|
rbd_destroy_ops(ops);
|
|
|
|
dout("cls_exec returned %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static struct rbd_req_coll *rbd_alloc_coll(int num_reqs)
|
|
{
|
|
struct rbd_req_coll *coll =
|
|
kzalloc(sizeof(struct rbd_req_coll) +
|
|
sizeof(struct rbd_req_status) * num_reqs,
|
|
GFP_ATOMIC);
|
|
|
|
if (!coll)
|
|
return NULL;
|
|
coll->total = num_reqs;
|
|
kref_init(&coll->kref);
|
|
return coll;
|
|
}
|
|
|
|
/*
|
|
* block device queue callback
|
|
*/
|
|
static void rbd_rq_fn(struct request_queue *q)
|
|
{
|
|
struct rbd_device *rbd_dev = q->queuedata;
|
|
struct request *rq;
|
|
|
|
while ((rq = blk_fetch_request(q))) {
|
|
struct bio *bio;
|
|
bool do_write;
|
|
unsigned int size;
|
|
u64 ofs;
|
|
int num_segs, cur_seg = 0;
|
|
struct rbd_req_coll *coll;
|
|
struct ceph_snap_context *snapc;
|
|
unsigned int bio_offset;
|
|
|
|
dout("fetched request\n");
|
|
|
|
/* filter out block requests we don't understand */
|
|
if ((rq->cmd_type != REQ_TYPE_FS)) {
|
|
__blk_end_request_all(rq, 0);
|
|
continue;
|
|
}
|
|
|
|
/* deduce our operation (read, write) */
|
|
do_write = (rq_data_dir(rq) == WRITE);
|
|
if (do_write && rbd_dev->mapping.read_only) {
|
|
__blk_end_request_all(rq, -EROFS);
|
|
continue;
|
|
}
|
|
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
down_read(&rbd_dev->header_rwsem);
|
|
|
|
if (!rbd_dev->exists) {
|
|
rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
|
|
up_read(&rbd_dev->header_rwsem);
|
|
dout("request for non-existent snapshot");
|
|
spin_lock_irq(q->queue_lock);
|
|
__blk_end_request_all(rq, -ENXIO);
|
|
continue;
|
|
}
|
|
|
|
snapc = ceph_get_snap_context(rbd_dev->header.snapc);
|
|
|
|
up_read(&rbd_dev->header_rwsem);
|
|
|
|
size = blk_rq_bytes(rq);
|
|
ofs = blk_rq_pos(rq) * SECTOR_SIZE;
|
|
bio = rq->bio;
|
|
|
|
dout("%s 0x%x bytes at 0x%llx\n",
|
|
do_write ? "write" : "read",
|
|
size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE);
|
|
|
|
num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size);
|
|
if (num_segs <= 0) {
|
|
spin_lock_irq(q->queue_lock);
|
|
__blk_end_request_all(rq, num_segs);
|
|
ceph_put_snap_context(snapc);
|
|
continue;
|
|
}
|
|
coll = rbd_alloc_coll(num_segs);
|
|
if (!coll) {
|
|
spin_lock_irq(q->queue_lock);
|
|
__blk_end_request_all(rq, -ENOMEM);
|
|
ceph_put_snap_context(snapc);
|
|
continue;
|
|
}
|
|
|
|
bio_offset = 0;
|
|
do {
|
|
u64 limit = rbd_segment_length(rbd_dev, ofs, size);
|
|
unsigned int chain_size;
|
|
struct bio *bio_chain;
|
|
|
|
BUG_ON(limit > (u64) UINT_MAX);
|
|
chain_size = (unsigned int) limit;
|
|
dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt);
|
|
|
|
kref_get(&coll->kref);
|
|
|
|
/* Pass a cloned bio chain via an osd request */
|
|
|
|
bio_chain = bio_chain_clone_range(&bio,
|
|
&bio_offset, chain_size,
|
|
GFP_ATOMIC);
|
|
if (bio_chain)
|
|
(void) rbd_do_op(rq, rbd_dev, snapc,
|
|
ofs, chain_size,
|
|
bio_chain, coll, cur_seg);
|
|
else
|
|
rbd_coll_end_req_index(rq, coll, cur_seg,
|
|
-ENOMEM, chain_size);
|
|
size -= chain_size;
|
|
ofs += chain_size;
|
|
|
|
cur_seg++;
|
|
} while (size > 0);
|
|
kref_put(&coll->kref, rbd_coll_release);
|
|
|
|
spin_lock_irq(q->queue_lock);
|
|
|
|
ceph_put_snap_context(snapc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* a queue callback. Makes sure that we don't create a bio that spans across
|
|
* multiple osd objects. One exception would be with a single page bios,
|
|
* which we handle later at bio_chain_clone_range()
|
|
*/
|
|
static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
|
|
struct bio_vec *bvec)
|
|
{
|
|
struct rbd_device *rbd_dev = q->queuedata;
|
|
sector_t sector_offset;
|
|
sector_t sectors_per_obj;
|
|
sector_t obj_sector_offset;
|
|
int ret;
|
|
|
|
/*
|
|
* Find how far into its rbd object the partition-relative
|
|
* bio start sector is to offset relative to the enclosing
|
|
* device.
|
|
*/
|
|
sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector;
|
|
sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT);
|
|
obj_sector_offset = sector_offset & (sectors_per_obj - 1);
|
|
|
|
/*
|
|
* Compute the number of bytes from that offset to the end
|
|
* of the object. Account for what's already used by the bio.
|
|
*/
|
|
ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT;
|
|
if (ret > bmd->bi_size)
|
|
ret -= bmd->bi_size;
|
|
else
|
|
ret = 0;
|
|
|
|
/*
|
|
* Don't send back more than was asked for. And if the bio
|
|
* was empty, let the whole thing through because: "Note
|
|
* that a block device *must* allow a single page to be
|
|
* added to an empty bio."
|
|
*/
|
|
rbd_assert(bvec->bv_len <= PAGE_SIZE);
|
|
if (ret > (int) bvec->bv_len || !bmd->bi_size)
|
|
ret = (int) bvec->bv_len;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_free_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
struct gendisk *disk = rbd_dev->disk;
|
|
|
|
if (!disk)
|
|
return;
|
|
|
|
if (disk->flags & GENHD_FL_UP)
|
|
del_gendisk(disk);
|
|
if (disk->queue)
|
|
blk_cleanup_queue(disk->queue);
|
|
put_disk(disk);
|
|
}
|
|
|
|
/*
|
|
* Read the complete header for the given rbd device.
|
|
*
|
|
* Returns a pointer to a dynamically-allocated buffer containing
|
|
* the complete and validated header. Caller can pass the address
|
|
* of a variable that will be filled in with the version of the
|
|
* header object at the time it was read.
|
|
*
|
|
* Returns a pointer-coded errno if a failure occurs.
|
|
*/
|
|
static struct rbd_image_header_ondisk *
|
|
rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version)
|
|
{
|
|
struct rbd_image_header_ondisk *ondisk = NULL;
|
|
u32 snap_count = 0;
|
|
u64 names_size = 0;
|
|
u32 want_count;
|
|
int ret;
|
|
|
|
/*
|
|
* The complete header will include an array of its 64-bit
|
|
* snapshot ids, followed by the names of those snapshots as
|
|
* a contiguous block of NUL-terminated strings. Note that
|
|
* the number of snapshots could change by the time we read
|
|
* it in, in which case we re-read it.
|
|
*/
|
|
do {
|
|
size_t size;
|
|
|
|
kfree(ondisk);
|
|
|
|
size = sizeof (*ondisk);
|
|
size += snap_count * sizeof (struct rbd_image_snap_ondisk);
|
|
size += names_size;
|
|
ondisk = kmalloc(size, GFP_KERNEL);
|
|
if (!ondisk)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP,
|
|
rbd_dev->header_name,
|
|
0, size,
|
|
(char *) ondisk, version);
|
|
|
|
if (ret < 0)
|
|
goto out_err;
|
|
if (WARN_ON((size_t) ret < size)) {
|
|
ret = -ENXIO;
|
|
pr_warning("short header read for image %s"
|
|
" (want %zd got %d)\n",
|
|
rbd_dev->spec->image_name, size, ret);
|
|
goto out_err;
|
|
}
|
|
if (!rbd_dev_ondisk_valid(ondisk)) {
|
|
ret = -ENXIO;
|
|
pr_warning("invalid header for image %s\n",
|
|
rbd_dev->spec->image_name);
|
|
goto out_err;
|
|
}
|
|
|
|
names_size = le64_to_cpu(ondisk->snap_names_len);
|
|
want_count = snap_count;
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
} while (snap_count != want_count);
|
|
|
|
return ondisk;
|
|
|
|
out_err:
|
|
kfree(ondisk);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* reload the ondisk the header
|
|
*/
|
|
static int rbd_read_header(struct rbd_device *rbd_dev,
|
|
struct rbd_image_header *header)
|
|
{
|
|
struct rbd_image_header_ondisk *ondisk;
|
|
u64 ver = 0;
|
|
int ret;
|
|
|
|
ondisk = rbd_dev_v1_header_read(rbd_dev, &ver);
|
|
if (IS_ERR(ondisk))
|
|
return PTR_ERR(ondisk);
|
|
ret = rbd_header_from_disk(header, ondisk);
|
|
if (ret >= 0)
|
|
header->obj_version = ver;
|
|
kfree(ondisk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_remove_all_snaps(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_snap *snap;
|
|
struct rbd_snap *next;
|
|
|
|
list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node)
|
|
rbd_remove_snap_dev(snap);
|
|
}
|
|
|
|
static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
|
|
{
|
|
sector_t size;
|
|
|
|
if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
|
|
return;
|
|
|
|
size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE;
|
|
dout("setting size to %llu sectors", (unsigned long long) size);
|
|
rbd_dev->mapping.size = (u64) size;
|
|
set_capacity(rbd_dev->disk, size);
|
|
}
|
|
|
|
/*
|
|
* only read the first part of the ondisk header, without the snaps info
|
|
*/
|
|
static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver)
|
|
{
|
|
int ret;
|
|
struct rbd_image_header h;
|
|
|
|
ret = rbd_read_header(rbd_dev, &h);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
down_write(&rbd_dev->header_rwsem);
|
|
|
|
/* Update image size, and check for resize of mapped image */
|
|
rbd_dev->header.image_size = h.image_size;
|
|
rbd_update_mapping_size(rbd_dev);
|
|
|
|
/* rbd_dev->header.object_prefix shouldn't change */
|
|
kfree(rbd_dev->header.snap_sizes);
|
|
kfree(rbd_dev->header.snap_names);
|
|
/* osd requests may still refer to snapc */
|
|
ceph_put_snap_context(rbd_dev->header.snapc);
|
|
|
|
if (hver)
|
|
*hver = h.obj_version;
|
|
rbd_dev->header.obj_version = h.obj_version;
|
|
rbd_dev->header.image_size = h.image_size;
|
|
rbd_dev->header.snapc = h.snapc;
|
|
rbd_dev->header.snap_names = h.snap_names;
|
|
rbd_dev->header.snap_sizes = h.snap_sizes;
|
|
/* Free the extra copy of the object prefix */
|
|
WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix));
|
|
kfree(h.object_prefix);
|
|
|
|
ret = rbd_dev_snaps_update(rbd_dev);
|
|
if (!ret)
|
|
ret = rbd_dev_snaps_register(rbd_dev);
|
|
|
|
up_write(&rbd_dev->header_rwsem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver)
|
|
{
|
|
int ret;
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
if (rbd_dev->image_format == 1)
|
|
ret = rbd_dev_v1_refresh(rbd_dev, hver);
|
|
else
|
|
ret = rbd_dev_v2_refresh(rbd_dev, hver);
|
|
mutex_unlock(&ctl_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_init_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
struct gendisk *disk;
|
|
struct request_queue *q;
|
|
u64 segment_size;
|
|
|
|
/* create gendisk info */
|
|
disk = alloc_disk(RBD_MINORS_PER_MAJOR);
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
|
|
snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d",
|
|
rbd_dev->dev_id);
|
|
disk->major = rbd_dev->major;
|
|
disk->first_minor = 0;
|
|
disk->fops = &rbd_bd_ops;
|
|
disk->private_data = rbd_dev;
|
|
|
|
/* init rq */
|
|
q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock);
|
|
if (!q)
|
|
goto out_disk;
|
|
|
|
/* We use the default size, but let's be explicit about it. */
|
|
blk_queue_physical_block_size(q, SECTOR_SIZE);
|
|
|
|
/* set io sizes to object size */
|
|
segment_size = rbd_obj_bytes(&rbd_dev->header);
|
|
blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
|
|
blk_queue_max_segment_size(q, segment_size);
|
|
blk_queue_io_min(q, segment_size);
|
|
blk_queue_io_opt(q, segment_size);
|
|
|
|
blk_queue_merge_bvec(q, rbd_merge_bvec);
|
|
disk->queue = q;
|
|
|
|
q->queuedata = rbd_dev;
|
|
|
|
rbd_dev->disk = disk;
|
|
|
|
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
|
|
|
|
return 0;
|
|
out_disk:
|
|
put_disk(disk);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
sysfs
|
|
*/
|
|
|
|
static struct rbd_device *dev_to_rbd_dev(struct device *dev)
|
|
{
|
|
return container_of(dev, struct rbd_device, dev);
|
|
}
|
|
|
|
static ssize_t rbd_size_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
sector_t size;
|
|
|
|
down_read(&rbd_dev->header_rwsem);
|
|
size = get_capacity(rbd_dev->disk);
|
|
up_read(&rbd_dev->header_rwsem);
|
|
|
|
return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE);
|
|
}
|
|
|
|
/*
|
|
* Note this shows the features for whatever's mapped, which is not
|
|
* necessarily the base image.
|
|
*/
|
|
static ssize_t rbd_features_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long) rbd_dev->mapping.features);
|
|
}
|
|
|
|
static ssize_t rbd_major_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%d\n", rbd_dev->major);
|
|
}
|
|
|
|
static ssize_t rbd_client_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "client%lld\n",
|
|
ceph_client_id(rbd_dev->rbd_client->client));
|
|
}
|
|
|
|
static ssize_t rbd_pool_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->pool_name);
|
|
}
|
|
|
|
static ssize_t rbd_pool_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n",
|
|
(unsigned long long) rbd_dev->spec->pool_id);
|
|
}
|
|
|
|
static ssize_t rbd_name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->spec->image_name)
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_name);
|
|
|
|
return sprintf(buf, "(unknown)\n");
|
|
}
|
|
|
|
static ssize_t rbd_image_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_id);
|
|
}
|
|
|
|
/*
|
|
* Shows the name of the currently-mapped snapshot (or
|
|
* RBD_SNAP_HEAD_NAME for the base image).
|
|
*/
|
|
static ssize_t rbd_snap_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->snap_name);
|
|
}
|
|
|
|
/*
|
|
* For an rbd v2 image, shows the pool id, image id, and snapshot id
|
|
* for the parent image. If there is no parent, simply shows
|
|
* "(no parent image)".
|
|
*/
|
|
static ssize_t rbd_parent_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
struct rbd_spec *spec = rbd_dev->parent_spec;
|
|
int count;
|
|
char *bufp = buf;
|
|
|
|
if (!spec)
|
|
return sprintf(buf, "(no parent image)\n");
|
|
|
|
count = sprintf(bufp, "pool_id %llu\npool_name %s\n",
|
|
(unsigned long long) spec->pool_id, spec->pool_name);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id,
|
|
spec->image_name ? spec->image_name : "(unknown)");
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n",
|
|
(unsigned long long) spec->snap_id, spec->snap_name);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
return (ssize_t) (bufp - buf);
|
|
}
|
|
|
|
static ssize_t rbd_image_refresh(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t size)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
int ret;
|
|
|
|
ret = rbd_dev_refresh(rbd_dev, NULL);
|
|
|
|
return ret < 0 ? ret : size;
|
|
}
|
|
|
|
static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
|
|
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
|
|
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
|
|
static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
|
|
static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
|
|
static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);
|
|
static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
|
|
static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL);
|
|
static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh);
|
|
static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
|
|
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);
|
|
|
|
static struct attribute *rbd_attrs[] = {
|
|
&dev_attr_size.attr,
|
|
&dev_attr_features.attr,
|
|
&dev_attr_major.attr,
|
|
&dev_attr_client_id.attr,
|
|
&dev_attr_pool.attr,
|
|
&dev_attr_pool_id.attr,
|
|
&dev_attr_name.attr,
|
|
&dev_attr_image_id.attr,
|
|
&dev_attr_current_snap.attr,
|
|
&dev_attr_parent.attr,
|
|
&dev_attr_refresh.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group rbd_attr_group = {
|
|
.attrs = rbd_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *rbd_attr_groups[] = {
|
|
&rbd_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static void rbd_sysfs_dev_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static struct device_type rbd_device_type = {
|
|
.name = "rbd",
|
|
.groups = rbd_attr_groups,
|
|
.release = rbd_sysfs_dev_release,
|
|
};
|
|
|
|
|
|
/*
|
|
sysfs - snapshots
|
|
*/
|
|
|
|
static ssize_t rbd_snap_size_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
|
|
|
|
return sprintf(buf, "%llu\n", (unsigned long long)snap->size);
|
|
}
|
|
|
|
static ssize_t rbd_snap_id_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
|
|
|
|
return sprintf(buf, "%llu\n", (unsigned long long)snap->id);
|
|
}
|
|
|
|
static ssize_t rbd_snap_features_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long) snap->features);
|
|
}
|
|
|
|
static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL);
|
|
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
|
|
static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL);
|
|
|
|
static struct attribute *rbd_snap_attrs[] = {
|
|
&dev_attr_snap_size.attr,
|
|
&dev_attr_snap_id.attr,
|
|
&dev_attr_snap_features.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group rbd_snap_attr_group = {
|
|
.attrs = rbd_snap_attrs,
|
|
};
|
|
|
|
static void rbd_snap_dev_release(struct device *dev)
|
|
{
|
|
struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
|
|
kfree(snap->name);
|
|
kfree(snap);
|
|
}
|
|
|
|
static const struct attribute_group *rbd_snap_attr_groups[] = {
|
|
&rbd_snap_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static struct device_type rbd_snap_device_type = {
|
|
.groups = rbd_snap_attr_groups,
|
|
.release = rbd_snap_dev_release,
|
|
};
|
|
|
|
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
|
|
{
|
|
kref_get(&spec->kref);
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref);
|
|
static void rbd_spec_put(struct rbd_spec *spec)
|
|
{
|
|
if (spec)
|
|
kref_put(&spec->kref, rbd_spec_free);
|
|
}
|
|
|
|
static struct rbd_spec *rbd_spec_alloc(void)
|
|
{
|
|
struct rbd_spec *spec;
|
|
|
|
spec = kzalloc(sizeof (*spec), GFP_KERNEL);
|
|
if (!spec)
|
|
return NULL;
|
|
kref_init(&spec->kref);
|
|
|
|
rbd_spec_put(rbd_spec_get(spec)); /* TEMPORARY */
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref)
|
|
{
|
|
struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref);
|
|
|
|
kfree(spec->pool_name);
|
|
kfree(spec->image_id);
|
|
kfree(spec->image_name);
|
|
kfree(spec->snap_name);
|
|
kfree(spec);
|
|
}
|
|
|
|
struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
|
|
struct rbd_spec *spec)
|
|
{
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL);
|
|
if (!rbd_dev)
|
|
return NULL;
|
|
|
|
spin_lock_init(&rbd_dev->lock);
|
|
INIT_LIST_HEAD(&rbd_dev->node);
|
|
INIT_LIST_HEAD(&rbd_dev->snaps);
|
|
init_rwsem(&rbd_dev->header_rwsem);
|
|
|
|
rbd_dev->spec = spec;
|
|
rbd_dev->rbd_client = rbdc;
|
|
|
|
return rbd_dev;
|
|
}
|
|
|
|
static void rbd_dev_destroy(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_spec_put(rbd_dev->parent_spec);
|
|
kfree(rbd_dev->header_name);
|
|
rbd_put_client(rbd_dev->rbd_client);
|
|
rbd_spec_put(rbd_dev->spec);
|
|
kfree(rbd_dev);
|
|
}
|
|
|
|
static bool rbd_snap_registered(struct rbd_snap *snap)
|
|
{
|
|
bool ret = snap->dev.type == &rbd_snap_device_type;
|
|
bool reg = device_is_registered(&snap->dev);
|
|
|
|
rbd_assert(!ret ^ reg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_remove_snap_dev(struct rbd_snap *snap)
|
|
{
|
|
list_del(&snap->node);
|
|
if (device_is_registered(&snap->dev))
|
|
device_unregister(&snap->dev);
|
|
}
|
|
|
|
static int rbd_register_snap_dev(struct rbd_snap *snap,
|
|
struct device *parent)
|
|
{
|
|
struct device *dev = &snap->dev;
|
|
int ret;
|
|
|
|
dev->type = &rbd_snap_device_type;
|
|
dev->parent = parent;
|
|
dev->release = rbd_snap_dev_release;
|
|
dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name);
|
|
dout("%s: registering device for snapshot %s\n", __func__, snap->name);
|
|
|
|
ret = device_register(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev,
|
|
const char *snap_name,
|
|
u64 snap_id, u64 snap_size,
|
|
u64 snap_features)
|
|
{
|
|
struct rbd_snap *snap;
|
|
int ret;
|
|
|
|
snap = kzalloc(sizeof (*snap), GFP_KERNEL);
|
|
if (!snap)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = -ENOMEM;
|
|
snap->name = kstrdup(snap_name, GFP_KERNEL);
|
|
if (!snap->name)
|
|
goto err;
|
|
|
|
snap->id = snap_id;
|
|
snap->size = snap_size;
|
|
snap->features = snap_features;
|
|
|
|
return snap;
|
|
|
|
err:
|
|
kfree(snap->name);
|
|
kfree(snap);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which,
|
|
u64 *snap_size, u64 *snap_features)
|
|
{
|
|
char *snap_name;
|
|
|
|
rbd_assert(which < rbd_dev->header.snapc->num_snaps);
|
|
|
|
*snap_size = rbd_dev->header.snap_sizes[which];
|
|
*snap_features = 0; /* No features for v1 */
|
|
|
|
/* Skip over names until we find the one we are looking for */
|
|
|
|
snap_name = rbd_dev->header.snap_names;
|
|
while (which--)
|
|
snap_name += strlen(snap_name) + 1;
|
|
|
|
return snap_name;
|
|
}
|
|
|
|
/*
|
|
* Get the size and object order for an image snapshot, or if
|
|
* snap_id is CEPH_NOSNAP, gets this information for the base
|
|
* image.
|
|
*/
|
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u8 *order, u64 *snap_size)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
int ret;
|
|
struct {
|
|
u8 order;
|
|
__le64 size;
|
|
} __attribute__ ((packed)) size_buf = { 0 };
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_size",
|
|
(char *) &snapid, sizeof (snapid),
|
|
(char *) &size_buf, sizeof (size_buf),
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*order = size_buf.order;
|
|
*snap_size = le64_to_cpu(size_buf.size);
|
|
|
|
dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n",
|
|
(unsigned long long) snap_id, (unsigned int) *order,
|
|
(unsigned long long) *snap_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.obj_order,
|
|
&rbd_dev->header.image_size);
|
|
}
|
|
|
|
static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
|
|
{
|
|
void *reply_buf;
|
|
int ret;
|
|
void *p;
|
|
|
|
reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_object_prefix",
|
|
NULL, 0,
|
|
reply_buf, RBD_OBJ_PREFIX_LEN_MAX,
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0; /* rbd_req_sync_exec() can return positive */
|
|
|
|
p = reply_buf;
|
|
rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
|
|
p + RBD_OBJ_PREFIX_LEN_MAX,
|
|
NULL, GFP_NOIO);
|
|
|
|
if (IS_ERR(rbd_dev->header.object_prefix)) {
|
|
ret = PTR_ERR(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
} else {
|
|
dout(" object_prefix = %s\n", rbd_dev->header.object_prefix);
|
|
}
|
|
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
struct {
|
|
__le64 features;
|
|
__le64 incompat;
|
|
} features_buf = { 0 };
|
|
u64 incompat;
|
|
int ret;
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_features",
|
|
(char *) &snapid, sizeof (snapid),
|
|
(char *) &features_buf, sizeof (features_buf),
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
incompat = le64_to_cpu(features_buf.incompat);
|
|
if (incompat & ~RBD_FEATURES_ALL)
|
|
return -ENXIO;
|
|
|
|
*snap_features = le64_to_cpu(features_buf.features);
|
|
|
|
dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
|
|
(unsigned long long) snap_id,
|
|
(unsigned long long) *snap_features,
|
|
(unsigned long long) le64_to_cpu(features_buf.incompat));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_features(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.features);
|
|
}
|
|
|
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *parent_spec;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
__le64 snapid;
|
|
void *p;
|
|
void *end;
|
|
char *image_id;
|
|
u64 overlap;
|
|
size_t len = 0;
|
|
int ret;
|
|
|
|
parent_spec = rbd_spec_alloc();
|
|
if (!parent_spec)
|
|
return -ENOMEM;
|
|
|
|
size = sizeof (__le64) + /* pool_id */
|
|
sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */
|
|
sizeof (__le64) + /* snap_id */
|
|
sizeof (__le64); /* overlap */
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
snapid = cpu_to_le64(CEPH_NOSNAP);
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_parent",
|
|
(char *) &snapid, sizeof (snapid),
|
|
(char *) reply_buf, size,
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
ret = -ERANGE;
|
|
p = reply_buf;
|
|
end = (char *) reply_buf + size;
|
|
ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err);
|
|
if (parent_spec->pool_id == CEPH_NOPOOL)
|
|
goto out; /* No parent? No problem. */
|
|
|
|
image_id = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
|
|
if (IS_ERR(image_id)) {
|
|
ret = PTR_ERR(image_id);
|
|
goto out_err;
|
|
}
|
|
parent_spec->image_id = image_id;
|
|
parent_spec->image_id_len = len;
|
|
ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err);
|
|
ceph_decode_64_safe(&p, end, overlap, out_err);
|
|
|
|
rbd_dev->parent_overlap = overlap;
|
|
rbd_dev->parent_spec = parent_spec;
|
|
parent_spec = NULL; /* rbd_dev now owns this */
|
|
out:
|
|
ret = 0;
|
|
out_err:
|
|
kfree(reply_buf);
|
|
rbd_spec_put(parent_spec);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
|
|
{
|
|
size_t image_id_size;
|
|
char *image_id;
|
|
void *p;
|
|
void *end;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
size_t len = 0;
|
|
char *image_name = NULL;
|
|
int ret;
|
|
|
|
rbd_assert(!rbd_dev->spec->image_name);
|
|
|
|
image_id_size = sizeof (__le32) + rbd_dev->spec->image_id_len;
|
|
image_id = kmalloc(image_id_size, GFP_KERNEL);
|
|
if (!image_id)
|
|
return NULL;
|
|
|
|
p = image_id;
|
|
end = (char *) image_id + image_id_size;
|
|
ceph_encode_string(&p, end, rbd_dev->spec->image_id,
|
|
(u32) rbd_dev->spec->image_id_len);
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
goto out;
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, RBD_DIRECTORY,
|
|
"rbd", "dir_get_name",
|
|
image_id, image_id_size,
|
|
(char *) reply_buf, size,
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
p = reply_buf;
|
|
end = (char *) reply_buf + size;
|
|
image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
|
|
if (IS_ERR(image_name))
|
|
image_name = NULL;
|
|
else
|
|
dout("%s: name is %s len is %zd\n", __func__, image_name, len);
|
|
out:
|
|
kfree(reply_buf);
|
|
kfree(image_id);
|
|
|
|
return image_name;
|
|
}
|
|
|
|
/*
|
|
* When a parent image gets probed, we only have the pool, image,
|
|
* and snapshot ids but not the names of any of them. This call
|
|
* is made later to fill in those names. It has to be done after
|
|
* rbd_dev_snaps_update() has completed because some of the
|
|
* information (in particular, snapshot name) is not available
|
|
* until then.
|
|
*/
|
|
static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc;
|
|
const char *name;
|
|
void *reply_buf = NULL;
|
|
int ret;
|
|
|
|
if (rbd_dev->spec->pool_name)
|
|
return 0; /* Already have the names */
|
|
|
|
/* Look up the pool name */
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id);
|
|
if (!name)
|
|
return -EIO; /* pool id too large (>= 2^31) */
|
|
|
|
rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL);
|
|
if (!rbd_dev->spec->pool_name)
|
|
return -ENOMEM;
|
|
|
|
/* Fetch the image name; tolerate failure here */
|
|
|
|
name = rbd_dev_image_name(rbd_dev);
|
|
if (name) {
|
|
rbd_dev->spec->image_name_len = strlen(name);
|
|
rbd_dev->spec->image_name = (char *) name;
|
|
} else {
|
|
pr_warning(RBD_DRV_NAME "%d "
|
|
"unable to get image name for image id %s\n",
|
|
rbd_dev->major, rbd_dev->spec->image_id);
|
|
}
|
|
|
|
/* Look up the snapshot name. */
|
|
|
|
name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id);
|
|
if (!name) {
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL);
|
|
if(!rbd_dev->spec->snap_name)
|
|
goto out_err;
|
|
|
|
return 0;
|
|
out_err:
|
|
kfree(reply_buf);
|
|
kfree(rbd_dev->spec->pool_name);
|
|
rbd_dev->spec->pool_name = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver)
|
|
{
|
|
size_t size;
|
|
int ret;
|
|
void *reply_buf;
|
|
void *p;
|
|
void *end;
|
|
u64 seq;
|
|
u32 snap_count;
|
|
struct ceph_snap_context *snapc;
|
|
u32 i;
|
|
|
|
/*
|
|
* We'll need room for the seq value (maximum snapshot id),
|
|
* snapshot count, and array of that many snapshot ids.
|
|
* For now we have a fixed upper limit on the number we're
|
|
* prepared to receive.
|
|
*/
|
|
size = sizeof (__le64) + sizeof (__le32) +
|
|
RBD_MAX_SNAP_COUNT * sizeof (__le64);
|
|
reply_buf = kzalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_snapcontext",
|
|
NULL, 0,
|
|
reply_buf, size,
|
|
CEPH_OSD_FLAG_READ, ver);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = -ERANGE;
|
|
p = reply_buf;
|
|
end = (char *) reply_buf + size;
|
|
ceph_decode_64_safe(&p, end, seq, out);
|
|
ceph_decode_32_safe(&p, end, snap_count, out);
|
|
|
|
/*
|
|
* Make sure the reported number of snapshot ids wouldn't go
|
|
* beyond the end of our buffer. But before checking that,
|
|
* make sure the computed size of the snapshot context we
|
|
* allocate is representable in a size_t.
|
|
*/
|
|
if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context))
|
|
/ sizeof (u64)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!ceph_has_room(&p, end, snap_count * sizeof (__le64)))
|
|
goto out;
|
|
|
|
size = sizeof (struct ceph_snap_context) +
|
|
snap_count * sizeof (snapc->snaps[0]);
|
|
snapc = kmalloc(size, GFP_KERNEL);
|
|
if (!snapc) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
atomic_set(&snapc->nref, 1);
|
|
snapc->seq = seq;
|
|
snapc->num_snaps = snap_count;
|
|
for (i = 0; i < snap_count; i++)
|
|
snapc->snaps[i] = ceph_decode_64(&p);
|
|
|
|
rbd_dev->header.snapc = snapc;
|
|
|
|
dout(" snap context seq = %llu, snap_count = %u\n",
|
|
(unsigned long long) seq, (unsigned int) snap_count);
|
|
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
|
|
{
|
|
size_t size;
|
|
void *reply_buf;
|
|
__le64 snap_id;
|
|
int ret;
|
|
void *p;
|
|
void *end;
|
|
char *snap_name;
|
|
|
|
size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]);
|
|
ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_snapshot_name",
|
|
(char *) &snap_id, sizeof (snap_id),
|
|
reply_buf, size,
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
p = reply_buf;
|
|
end = (char *) reply_buf + size;
|
|
snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
|
|
if (IS_ERR(snap_name)) {
|
|
ret = PTR_ERR(snap_name);
|
|
goto out;
|
|
} else {
|
|
dout(" snap_id 0x%016llx snap_name = %s\n",
|
|
(unsigned long long) le64_to_cpu(snap_id), snap_name);
|
|
}
|
|
kfree(reply_buf);
|
|
|
|
return snap_name;
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which,
|
|
u64 *snap_size, u64 *snap_features)
|
|
{
|
|
__le64 snap_id;
|
|
u8 order;
|
|
int ret;
|
|
|
|
snap_id = rbd_dev->header.snapc->snaps[which];
|
|
ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
return rbd_dev_v2_snap_name(rbd_dev, which);
|
|
}
|
|
|
|
static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which,
|
|
u64 *snap_size, u64 *snap_features)
|
|
{
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_dev_v1_snap_info(rbd_dev, which,
|
|
snap_size, snap_features);
|
|
if (rbd_dev->image_format == 2)
|
|
return rbd_dev_v2_snap_info(rbd_dev, which,
|
|
snap_size, snap_features);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver)
|
|
{
|
|
int ret;
|
|
__u8 obj_order;
|
|
|
|
down_write(&rbd_dev->header_rwsem);
|
|
|
|
/* Grab old order first, to see if it changes */
|
|
|
|
obj_order = rbd_dev->header.obj_order,
|
|
ret = rbd_dev_v2_image_size(rbd_dev);
|
|
if (ret)
|
|
goto out;
|
|
if (rbd_dev->header.obj_order != obj_order) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
rbd_update_mapping_size(rbd_dev);
|
|
|
|
ret = rbd_dev_v2_snap_context(rbd_dev, hver);
|
|
dout("rbd_dev_v2_snap_context returned %d\n", ret);
|
|
if (ret)
|
|
goto out;
|
|
ret = rbd_dev_snaps_update(rbd_dev);
|
|
dout("rbd_dev_snaps_update returned %d\n", ret);
|
|
if (ret)
|
|
goto out;
|
|
ret = rbd_dev_snaps_register(rbd_dev);
|
|
dout("rbd_dev_snaps_register returned %d\n", ret);
|
|
out:
|
|
up_write(&rbd_dev->header_rwsem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Scan the rbd device's current snapshot list and compare it to the
|
|
* newly-received snapshot context. Remove any existing snapshots
|
|
* not present in the new snapshot context. Add a new snapshot for
|
|
* any snaphots in the snapshot context not in the current list.
|
|
* And verify there are no changes to snapshots we already know
|
|
* about.
|
|
*
|
|
* Assumes the snapshots in the snapshot context are sorted by
|
|
* snapshot id, highest id first. (Snapshots in the rbd_dev's list
|
|
* are also maintained in that order.)
|
|
*/
|
|
static int rbd_dev_snaps_update(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
const u32 snap_count = snapc->num_snaps;
|
|
struct list_head *head = &rbd_dev->snaps;
|
|
struct list_head *links = head->next;
|
|
u32 index = 0;
|
|
|
|
dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count);
|
|
while (index < snap_count || links != head) {
|
|
u64 snap_id;
|
|
struct rbd_snap *snap;
|
|
char *snap_name;
|
|
u64 snap_size = 0;
|
|
u64 snap_features = 0;
|
|
|
|
snap_id = index < snap_count ? snapc->snaps[index]
|
|
: CEPH_NOSNAP;
|
|
snap = links != head ? list_entry(links, struct rbd_snap, node)
|
|
: NULL;
|
|
rbd_assert(!snap || snap->id != CEPH_NOSNAP);
|
|
|
|
if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) {
|
|
struct list_head *next = links->next;
|
|
|
|
/* Existing snapshot not in the new snap context */
|
|
|
|
if (rbd_dev->spec->snap_id == snap->id)
|
|
rbd_dev->exists = false;
|
|
rbd_remove_snap_dev(snap);
|
|
dout("%ssnap id %llu has been removed\n",
|
|
rbd_dev->spec->snap_id == snap->id ?
|
|
"mapped " : "",
|
|
(unsigned long long) snap->id);
|
|
|
|
/* Done with this list entry; advance */
|
|
|
|
links = next;
|
|
continue;
|
|
}
|
|
|
|
snap_name = rbd_dev_snap_info(rbd_dev, index,
|
|
&snap_size, &snap_features);
|
|
if (IS_ERR(snap_name))
|
|
return PTR_ERR(snap_name);
|
|
|
|
dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count,
|
|
(unsigned long long) snap_id);
|
|
if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) {
|
|
struct rbd_snap *new_snap;
|
|
|
|
/* We haven't seen this snapshot before */
|
|
|
|
new_snap = __rbd_add_snap_dev(rbd_dev, snap_name,
|
|
snap_id, snap_size, snap_features);
|
|
if (IS_ERR(new_snap)) {
|
|
int err = PTR_ERR(new_snap);
|
|
|
|
dout(" failed to add dev, error %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* New goes before existing, or at end of list */
|
|
|
|
dout(" added dev%s\n", snap ? "" : " at end\n");
|
|
if (snap)
|
|
list_add_tail(&new_snap->node, &snap->node);
|
|
else
|
|
list_add_tail(&new_snap->node, head);
|
|
} else {
|
|
/* Already have this one */
|
|
|
|
dout(" already present\n");
|
|
|
|
rbd_assert(snap->size == snap_size);
|
|
rbd_assert(!strcmp(snap->name, snap_name));
|
|
rbd_assert(snap->features == snap_features);
|
|
|
|
/* Done with this list entry; advance */
|
|
|
|
links = links->next;
|
|
}
|
|
|
|
/* Advance to the next entry in the snapshot context */
|
|
|
|
index++;
|
|
}
|
|
dout("%s: done\n", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Scan the list of snapshots and register the devices for any that
|
|
* have not already been registered.
|
|
*/
|
|
static int rbd_dev_snaps_register(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_snap *snap;
|
|
int ret = 0;
|
|
|
|
dout("%s called\n", __func__);
|
|
if (WARN_ON(!device_is_registered(&rbd_dev->dev)))
|
|
return -EIO;
|
|
|
|
list_for_each_entry(snap, &rbd_dev->snaps, node) {
|
|
if (!rbd_snap_registered(snap)) {
|
|
ret = rbd_register_snap_dev(snap, &rbd_dev->dev);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
}
|
|
dout("%s: returning %d\n", __func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
|
|
{
|
|
struct device *dev;
|
|
int ret;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
dev = &rbd_dev->dev;
|
|
dev->bus = &rbd_bus_type;
|
|
dev->type = &rbd_device_type;
|
|
dev->parent = &rbd_root_dev;
|
|
dev->release = rbd_dev_release;
|
|
dev_set_name(dev, "%d", rbd_dev->dev_id);
|
|
ret = device_register(dev);
|
|
|
|
mutex_unlock(&ctl_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
|
|
{
|
|
device_unregister(&rbd_dev->dev);
|
|
}
|
|
|
|
static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret, rc;
|
|
|
|
do {
|
|
ret = rbd_req_sync_watch(rbd_dev);
|
|
if (ret == -ERANGE) {
|
|
rc = rbd_dev_refresh(rbd_dev, NULL);
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
} while (ret == -ERANGE);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0);
|
|
|
|
/*
|
|
* Get a unique rbd identifier for the given new rbd_dev, and add
|
|
* the rbd_dev to the global list. The minimum rbd id is 1.
|
|
*/
|
|
static void rbd_dev_id_get(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max);
|
|
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_add_tail(&rbd_dev->node, &rbd_dev_list);
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
dout("rbd_dev %p given dev id %llu\n", rbd_dev,
|
|
(unsigned long long) rbd_dev->dev_id);
|
|
}
|
|
|
|
/*
|
|
* Remove an rbd_dev from the global list, and record that its
|
|
* identifier is no longer in use.
|
|
*/
|
|
static void rbd_dev_id_put(struct rbd_device *rbd_dev)
|
|
{
|
|
struct list_head *tmp;
|
|
int rbd_id = rbd_dev->dev_id;
|
|
int max_id;
|
|
|
|
rbd_assert(rbd_id > 0);
|
|
|
|
dout("rbd_dev %p released dev id %llu\n", rbd_dev,
|
|
(unsigned long long) rbd_dev->dev_id);
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_del_init(&rbd_dev->node);
|
|
|
|
/*
|
|
* If the id being "put" is not the current maximum, there
|
|
* is nothing special we need to do.
|
|
*/
|
|
if (rbd_id != atomic64_read(&rbd_dev_id_max)) {
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We need to update the current maximum id. Search the
|
|
* list to find out what it is. We're more likely to find
|
|
* the maximum at the end, so search the list backward.
|
|
*/
|
|
max_id = 0;
|
|
list_for_each_prev(tmp, &rbd_dev_list) {
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
|
if (rbd_dev->dev_id > max_id)
|
|
max_id = rbd_dev->dev_id;
|
|
}
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
|
|
/*
|
|
* The max id could have been updated by rbd_dev_id_get(), in
|
|
* which case it now accurately reflects the new maximum.
|
|
* Be careful not to overwrite the maximum value in that
|
|
* case.
|
|
*/
|
|
atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id);
|
|
dout(" max dev id has been reset\n");
|
|
}
|
|
|
|
/*
|
|
* Skips over white space at *buf, and updates *buf to point to the
|
|
* first found non-space character (if any). Returns the length of
|
|
* the token (string of non-white space characters) found. Note
|
|
* that *buf must be terminated with '\0'.
|
|
*/
|
|
static inline size_t next_token(const char **buf)
|
|
{
|
|
/*
|
|
* These are the characters that produce nonzero for
|
|
* isspace() in the "C" and "POSIX" locales.
|
|
*/
|
|
const char *spaces = " \f\n\r\t\v";
|
|
|
|
*buf += strspn(*buf, spaces); /* Find start of token */
|
|
|
|
return strcspn(*buf, spaces); /* Return token length */
|
|
}
|
|
|
|
/*
|
|
* Finds the next token in *buf, and if the provided token buffer is
|
|
* big enough, copies the found token into it. The result, if
|
|
* copied, is guaranteed to be terminated with '\0'. Note that *buf
|
|
* must be terminated with '\0' on entry.
|
|
*
|
|
* Returns the length of the token found (not including the '\0').
|
|
* Return value will be 0 if no token is found, and it will be >=
|
|
* token_size if the token would not fit.
|
|
*
|
|
* The *buf pointer will be updated to point beyond the end of the
|
|
* found token. Note that this occurs even if the token buffer is
|
|
* too small to hold it.
|
|
*/
|
|
static inline size_t copy_token(const char **buf,
|
|
char *token,
|
|
size_t token_size)
|
|
{
|
|
size_t len;
|
|
|
|
len = next_token(buf);
|
|
if (len < token_size) {
|
|
memcpy(token, *buf, len);
|
|
*(token + len) = '\0';
|
|
}
|
|
*buf += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Finds the next token in *buf, dynamically allocates a buffer big
|
|
* enough to hold a copy of it, and copies the token into the new
|
|
* buffer. The copy is guaranteed to be terminated with '\0'. Note
|
|
* that a duplicate buffer is created even for a zero-length token.
|
|
*
|
|
* Returns a pointer to the newly-allocated duplicate, or a null
|
|
* pointer if memory for the duplicate was not available. If
|
|
* the lenp argument is a non-null pointer, the length of the token
|
|
* (not including the '\0') is returned in *lenp.
|
|
*
|
|
* If successful, the *buf pointer will be updated to point beyond
|
|
* the end of the found token.
|
|
*
|
|
* Note: uses GFP_KERNEL for allocation.
|
|
*/
|
|
static inline char *dup_token(const char **buf, size_t *lenp)
|
|
{
|
|
char *dup;
|
|
size_t len;
|
|
|
|
len = next_token(buf);
|
|
dup = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!dup)
|
|
return NULL;
|
|
|
|
memcpy(dup, *buf, len);
|
|
*(dup + len) = '\0';
|
|
*buf += len;
|
|
|
|
if (lenp)
|
|
*lenp = len;
|
|
|
|
return dup;
|
|
}
|
|
|
|
/*
|
|
* Parse the options provided for an "rbd add" (i.e., rbd image
|
|
* mapping) request. These arrive via a write to /sys/bus/rbd/add,
|
|
* and the data written is passed here via a NUL-terminated buffer.
|
|
* Returns 0 if successful or an error code otherwise.
|
|
*
|
|
* The information extracted from these options is recorded in
|
|
* the other parameters which return dynamically-allocated
|
|
* structures:
|
|
* ceph_opts
|
|
* The address of a pointer that will refer to a ceph options
|
|
* structure. Caller must release the returned pointer using
|
|
* ceph_destroy_options() when it is no longer needed.
|
|
* rbd_opts
|
|
* Address of an rbd options pointer. Fully initialized by
|
|
* this function; caller must release with kfree().
|
|
* spec
|
|
* Address of an rbd image specification pointer. Fully
|
|
* initialized by this function based on parsed options.
|
|
* Caller must release with rbd_spec_put().
|
|
*
|
|
* The options passed take this form:
|
|
* <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
|
|
* where:
|
|
* <mon_addrs>
|
|
* A comma-separated list of one or more monitor addresses.
|
|
* A monitor address is an ip address, optionally followed
|
|
* by a port number (separated by a colon).
|
|
* I.e.: ip1[:port1][,ip2[:port2]...]
|
|
* <options>
|
|
* A comma-separated list of ceph and/or rbd options.
|
|
* <pool_name>
|
|
* The name of the rados pool containing the rbd image.
|
|
* <image_name>
|
|
* The name of the image in that pool to map.
|
|
* <snap_id>
|
|
* An optional snapshot id. If provided, the mapping will
|
|
* present data from the image at the time that snapshot was
|
|
* created. The image head is used if no snapshot id is
|
|
* provided. Snapshot mappings are always read-only.
|
|
*/
|
|
static int rbd_add_parse_args(const char *buf,
|
|
struct ceph_options **ceph_opts,
|
|
struct rbd_options **opts,
|
|
struct rbd_spec **rbd_spec)
|
|
{
|
|
size_t len;
|
|
char *options;
|
|
const char *mon_addrs;
|
|
size_t mon_addrs_size;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct ceph_options *copts;
|
|
int ret;
|
|
|
|
/* The first four tokens are required */
|
|
|
|
len = next_token(&buf);
|
|
if (!len)
|
|
return -EINVAL; /* Missing monitor address(es) */
|
|
mon_addrs = buf;
|
|
mon_addrs_size = len + 1;
|
|
buf += len;
|
|
|
|
ret = -EINVAL;
|
|
options = dup_token(&buf, NULL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
if (!*options)
|
|
goto out_err; /* Missing options */
|
|
|
|
spec = rbd_spec_alloc();
|
|
if (!spec)
|
|
goto out_mem;
|
|
|
|
spec->pool_name = dup_token(&buf, NULL);
|
|
if (!spec->pool_name)
|
|
goto out_mem;
|
|
if (!*spec->pool_name)
|
|
goto out_err; /* Missing pool name */
|
|
|
|
spec->image_name = dup_token(&buf, &spec->image_name_len);
|
|
if (!spec->image_name)
|
|
goto out_mem;
|
|
if (!*spec->image_name)
|
|
goto out_err; /* Missing image name */
|
|
|
|
/*
|
|
* Snapshot name is optional; default is to use "-"
|
|
* (indicating the head/no snapshot).
|
|
*/
|
|
len = next_token(&buf);
|
|
if (!len) {
|
|
buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
|
|
len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
|
|
} else if (len > RBD_MAX_SNAP_NAME_LEN) {
|
|
ret = -ENAMETOOLONG;
|
|
goto out_err;
|
|
}
|
|
spec->snap_name = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!spec->snap_name)
|
|
goto out_mem;
|
|
memcpy(spec->snap_name, buf, len);
|
|
*(spec->snap_name + len) = '\0';
|
|
|
|
/* Initialize all rbd options to the defaults */
|
|
|
|
rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL);
|
|
if (!rbd_opts)
|
|
goto out_mem;
|
|
|
|
rbd_opts->read_only = RBD_READ_ONLY_DEFAULT;
|
|
|
|
copts = ceph_parse_options(options, mon_addrs,
|
|
mon_addrs + mon_addrs_size - 1,
|
|
parse_rbd_opts_token, rbd_opts);
|
|
if (IS_ERR(copts)) {
|
|
ret = PTR_ERR(copts);
|
|
goto out_err;
|
|
}
|
|
kfree(options);
|
|
|
|
*ceph_opts = copts;
|
|
*opts = rbd_opts;
|
|
*rbd_spec = spec;
|
|
|
|
return 0;
|
|
out_mem:
|
|
ret = -ENOMEM;
|
|
out_err:
|
|
kfree(rbd_opts);
|
|
rbd_spec_put(spec);
|
|
kfree(options);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* An rbd format 2 image has a unique identifier, distinct from the
|
|
* name given to it by the user. Internally, that identifier is
|
|
* what's used to specify the names of objects related to the image.
|
|
*
|
|
* A special "rbd id" object is used to map an rbd image name to its
|
|
* id. If that object doesn't exist, then there is no v2 rbd image
|
|
* with the supplied name.
|
|
*
|
|
* This function will record the given rbd_dev's image_id field if
|
|
* it can be determined, and in that case will return 0. If any
|
|
* errors occur a negative errno will be returned and the rbd_dev's
|
|
* image_id field will be unchanged (and should be NULL).
|
|
*/
|
|
static int rbd_dev_image_id(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
size_t size;
|
|
char *object_name;
|
|
void *response;
|
|
void *p;
|
|
|
|
/*
|
|
* When probing a parent image, the image id is already
|
|
* known (and the image name likely is not). There's no
|
|
* need to fetch the image id again in this case.
|
|
*/
|
|
if (rbd_dev->spec->image_id)
|
|
return 0;
|
|
|
|
/*
|
|
* First, see if the format 2 image id file exists, and if
|
|
* so, get the image's persistent id from it.
|
|
*/
|
|
size = sizeof (RBD_ID_PREFIX) + rbd_dev->spec->image_name_len;
|
|
object_name = kmalloc(size, GFP_NOIO);
|
|
if (!object_name)
|
|
return -ENOMEM;
|
|
sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name);
|
|
dout("rbd id object name is %s\n", object_name);
|
|
|
|
/* Response will be an encoded string, which includes a length */
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX;
|
|
response = kzalloc(size, GFP_NOIO);
|
|
if (!response) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = rbd_req_sync_exec(rbd_dev, object_name,
|
|
"rbd", "get_id",
|
|
NULL, 0,
|
|
response, RBD_IMAGE_ID_LEN_MAX,
|
|
CEPH_OSD_FLAG_READ, NULL);
|
|
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0; /* rbd_req_sync_exec() can return positive */
|
|
|
|
p = response;
|
|
rbd_dev->spec->image_id = ceph_extract_encoded_string(&p,
|
|
p + RBD_IMAGE_ID_LEN_MAX,
|
|
&rbd_dev->spec->image_id_len,
|
|
GFP_NOIO);
|
|
if (IS_ERR(rbd_dev->spec->image_id)) {
|
|
ret = PTR_ERR(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
} else {
|
|
dout("image_id is %s\n", rbd_dev->spec->image_id);
|
|
}
|
|
out:
|
|
kfree(response);
|
|
kfree(object_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v1_probe(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
size_t size;
|
|
|
|
/* Version 1 images have no id; empty string is used */
|
|
|
|
rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL);
|
|
if (!rbd_dev->spec->image_id)
|
|
return -ENOMEM;
|
|
rbd_dev->spec->image_id_len = 0;
|
|
|
|
/* Record the header object name for this rbd image. */
|
|
|
|
size = rbd_dev->spec->image_name_len + sizeof (RBD_SUFFIX);
|
|
rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
|
|
if (!rbd_dev->header_name) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
sprintf(rbd_dev->header_name, "%s%s",
|
|
rbd_dev->spec->image_name, RBD_SUFFIX);
|
|
|
|
/* Populate rbd image metadata */
|
|
|
|
ret = rbd_read_header(rbd_dev, &rbd_dev->header);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
/* Version 1 images have no parent (no layering) */
|
|
|
|
rbd_dev->parent_spec = NULL;
|
|
rbd_dev->parent_overlap = 0;
|
|
|
|
rbd_dev->image_format = 1;
|
|
|
|
dout("discovered version 1 image, header name is %s\n",
|
|
rbd_dev->header_name);
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
kfree(rbd_dev->header_name);
|
|
rbd_dev->header_name = NULL;
|
|
kfree(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
|
|
{
|
|
size_t size;
|
|
int ret;
|
|
u64 ver = 0;
|
|
|
|
/*
|
|
* Image id was filled in by the caller. Record the header
|
|
* object name for this rbd image.
|
|
*/
|
|
size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->spec->image_id_len;
|
|
rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
|
|
if (!rbd_dev->header_name)
|
|
return -ENOMEM;
|
|
sprintf(rbd_dev->header_name, "%s%s",
|
|
RBD_HEADER_PREFIX, rbd_dev->spec->image_id);
|
|
|
|
/* Get the size and object order for the image */
|
|
|
|
ret = rbd_dev_v2_image_size(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
/* Get the object prefix (a.k.a. block_name) for the image */
|
|
|
|
ret = rbd_dev_v2_object_prefix(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
/* Get the and check features for the image */
|
|
|
|
ret = rbd_dev_v2_features(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
/* If the image supports layering, get the parent info */
|
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_LAYERING) {
|
|
ret = rbd_dev_v2_parent_info(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
/* crypto and compression type aren't (yet) supported for v2 images */
|
|
|
|
rbd_dev->header.crypt_type = 0;
|
|
rbd_dev->header.comp_type = 0;
|
|
|
|
/* Get the snapshot context, plus the header version */
|
|
|
|
ret = rbd_dev_v2_snap_context(rbd_dev, &ver);
|
|
if (ret)
|
|
goto out_err;
|
|
rbd_dev->header.obj_version = ver;
|
|
|
|
rbd_dev->image_format = 2;
|
|
|
|
dout("discovered version 2 image, header name is %s\n",
|
|
rbd_dev->header_name);
|
|
|
|
return 0;
|
|
out_err:
|
|
rbd_dev->parent_overlap = 0;
|
|
rbd_spec_put(rbd_dev->parent_spec);
|
|
rbd_dev->parent_spec = NULL;
|
|
kfree(rbd_dev->header_name);
|
|
rbd_dev->header_name = NULL;
|
|
kfree(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
/* no need to lock here, as rbd_dev is not registered yet */
|
|
ret = rbd_dev_snaps_update(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = rbd_dev_probe_update_spec(rbd_dev);
|
|
if (ret)
|
|
goto err_out_snaps;
|
|
|
|
ret = rbd_dev_set_mapping(rbd_dev);
|
|
if (ret)
|
|
goto err_out_snaps;
|
|
|
|
/* generate unique id: find highest unique id, add one */
|
|
rbd_dev_id_get(rbd_dev);
|
|
|
|
/* Fill in the device name, now that we have its id. */
|
|
BUILD_BUG_ON(DEV_NAME_LEN
|
|
< sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH);
|
|
sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id);
|
|
|
|
/* Get our block major device number. */
|
|
|
|
ret = register_blkdev(0, rbd_dev->name);
|
|
if (ret < 0)
|
|
goto err_out_id;
|
|
rbd_dev->major = ret;
|
|
|
|
/* Set up the blkdev mapping. */
|
|
|
|
ret = rbd_init_disk(rbd_dev);
|
|
if (ret)
|
|
goto err_out_blkdev;
|
|
|
|
ret = rbd_bus_add_dev(rbd_dev);
|
|
if (ret)
|
|
goto err_out_disk;
|
|
|
|
/*
|
|
* At this point cleanup in the event of an error is the job
|
|
* of the sysfs code (initiated by rbd_bus_del_dev()).
|
|
*/
|
|
down_write(&rbd_dev->header_rwsem);
|
|
ret = rbd_dev_snaps_register(rbd_dev);
|
|
up_write(&rbd_dev->header_rwsem);
|
|
if (ret)
|
|
goto err_out_bus;
|
|
|
|
ret = rbd_init_watch_dev(rbd_dev);
|
|
if (ret)
|
|
goto err_out_bus;
|
|
|
|
/* Everything's ready. Announce the disk to the world. */
|
|
|
|
add_disk(rbd_dev->disk);
|
|
|
|
pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name,
|
|
(unsigned long long) rbd_dev->mapping.size);
|
|
|
|
return ret;
|
|
err_out_bus:
|
|
/* this will also clean up rest of rbd_dev stuff */
|
|
|
|
rbd_bus_del_dev(rbd_dev);
|
|
|
|
return ret;
|
|
err_out_disk:
|
|
rbd_free_disk(rbd_dev);
|
|
err_out_blkdev:
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
err_out_id:
|
|
rbd_dev_id_put(rbd_dev);
|
|
err_out_snaps:
|
|
rbd_remove_all_snaps(rbd_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Probe for the existence of the header object for the given rbd
|
|
* device. For format 2 images this includes determining the image
|
|
* id.
|
|
*/
|
|
static int rbd_dev_probe(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Get the id from the image id object. If it's not a
|
|
* format 2 image, we'll get ENOENT back, and we'll assume
|
|
* it's a format 1 image.
|
|
*/
|
|
ret = rbd_dev_image_id(rbd_dev);
|
|
if (ret)
|
|
ret = rbd_dev_v1_probe(rbd_dev);
|
|
else
|
|
ret = rbd_dev_v2_probe(rbd_dev);
|
|
if (ret) {
|
|
dout("probe failed, returning %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
ret = rbd_dev_probe_finish(rbd_dev);
|
|
if (ret)
|
|
rbd_header_free(&rbd_dev->header);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t rbd_add(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
struct ceph_options *ceph_opts = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_client *rbdc;
|
|
struct ceph_osd_client *osdc;
|
|
int rc = -ENOMEM;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -ENODEV;
|
|
|
|
/* parse add command */
|
|
rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
|
|
if (rc < 0)
|
|
goto err_out_module;
|
|
|
|
rbdc = rbd_get_client(ceph_opts);
|
|
if (IS_ERR(rbdc)) {
|
|
rc = PTR_ERR(rbdc);
|
|
goto err_out_args;
|
|
}
|
|
ceph_opts = NULL; /* rbd_dev client now owns this */
|
|
|
|
/* pick the pool */
|
|
osdc = &rbdc->client->osdc;
|
|
rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name);
|
|
if (rc < 0)
|
|
goto err_out_client;
|
|
spec->pool_id = (u64) rc;
|
|
|
|
rbd_dev = rbd_dev_create(rbdc, spec);
|
|
if (!rbd_dev)
|
|
goto err_out_client;
|
|
rbdc = NULL; /* rbd_dev now owns this */
|
|
spec = NULL; /* rbd_dev now owns this */
|
|
|
|
rbd_dev->mapping.read_only = rbd_opts->read_only;
|
|
kfree(rbd_opts);
|
|
rbd_opts = NULL; /* done with this */
|
|
|
|
rc = rbd_dev_probe(rbd_dev);
|
|
if (rc < 0)
|
|
goto err_out_rbd_dev;
|
|
|
|
return count;
|
|
err_out_rbd_dev:
|
|
rbd_dev_destroy(rbd_dev);
|
|
err_out_client:
|
|
rbd_put_client(rbdc);
|
|
err_out_args:
|
|
if (ceph_opts)
|
|
ceph_destroy_options(ceph_opts);
|
|
kfree(rbd_opts);
|
|
rbd_spec_put(spec);
|
|
err_out_module:
|
|
module_put(THIS_MODULE);
|
|
|
|
dout("Error adding device %s\n", buf);
|
|
|
|
return (ssize_t) rc;
|
|
}
|
|
|
|
static struct rbd_device *__rbd_get_dev(unsigned long dev_id)
|
|
{
|
|
struct list_head *tmp;
|
|
struct rbd_device *rbd_dev;
|
|
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_for_each(tmp, &rbd_dev_list) {
|
|
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
|
if (rbd_dev->dev_id == dev_id) {
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
return rbd_dev;
|
|
}
|
|
}
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static void rbd_dev_release(struct device *dev)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->watch_request) {
|
|
struct ceph_client *client = rbd_dev->rbd_client->client;
|
|
|
|
ceph_osdc_unregister_linger_request(&client->osdc,
|
|
rbd_dev->watch_request);
|
|
}
|
|
if (rbd_dev->watch_event)
|
|
rbd_req_sync_unwatch(rbd_dev);
|
|
|
|
|
|
/* clean up and free blkdev */
|
|
rbd_free_disk(rbd_dev);
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
|
|
/* release allocated disk header fields */
|
|
rbd_header_free(&rbd_dev->header);
|
|
|
|
/* done with the id, and with the rbd_dev */
|
|
rbd_dev_id_put(rbd_dev);
|
|
rbd_assert(rbd_dev->rbd_client != NULL);
|
|
rbd_dev_destroy(rbd_dev);
|
|
|
|
/* release module ref */
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static ssize_t rbd_remove(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
int target_id, rc;
|
|
unsigned long ul;
|
|
int ret = count;
|
|
|
|
rc = strict_strtoul(buf, 10, &ul);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* convert to int; abort if we lost anything in the conversion */
|
|
target_id = (int) ul;
|
|
if (target_id != ul)
|
|
return -EINVAL;
|
|
|
|
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
rbd_dev = __rbd_get_dev(target_id);
|
|
if (!rbd_dev) {
|
|
ret = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
if (rbd_dev->open_count) {
|
|
ret = -EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
rbd_remove_all_snaps(rbd_dev);
|
|
rbd_bus_del_dev(rbd_dev);
|
|
|
|
done:
|
|
mutex_unlock(&ctl_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create control files in sysfs
|
|
* /sys/bus/rbd/...
|
|
*/
|
|
static int rbd_sysfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_register(&rbd_root_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = bus_register(&rbd_bus_type);
|
|
if (ret < 0)
|
|
device_unregister(&rbd_root_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_sysfs_cleanup(void)
|
|
{
|
|
bus_unregister(&rbd_bus_type);
|
|
device_unregister(&rbd_root_dev);
|
|
}
|
|
|
|
int __init rbd_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = rbd_sysfs_init();
|
|
if (rc)
|
|
return rc;
|
|
pr_info("loaded " RBD_DRV_NAME_LONG "\n");
|
|
return 0;
|
|
}
|
|
|
|
void __exit rbd_exit(void)
|
|
{
|
|
rbd_sysfs_cleanup();
|
|
}
|
|
|
|
module_init(rbd_init);
|
|
module_exit(rbd_exit);
|
|
|
|
MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
|
|
MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
|
|
MODULE_DESCRIPTION("rados block device");
|
|
|
|
/* following authorship retained from original osdblk.c */
|
|
MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
|
|
|
|
MODULE_LICENSE("GPL");
|