mirror of https://gitee.com/openkylin/linux.git
rbd: replace the rbd sysfs interface
The new interface creates directories per mapped image and under each it creates a subdir per available snapshot. This allows keeping a cleaner interface within the sysfs guidelines. The ABI documentation was updated too. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Yehuda Sadeh
Sage Weil
parent
3561d43fd2
commit
dfc5606dc5
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@ -0,0 +1,83 @@
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What: /sys/bus/rbd/
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Date: November 2010
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Contact: Yehuda Sadeh <yehuda@hq.newdream.net>,
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Sage Weil <sage@newdream.net>
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Description:
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Being used for adding and removing rbd block devices.
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
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will be assigned for any registered block device. If snapshot is used, it will
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be mapped read-only.
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Removal of a device:
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$ echo <dev-id> > /sys/bus/rbd/remove
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Entries under /sys/bus/rbd/devices/<dev-id>/
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--------------------------------------------
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client_id
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The ceph unique client id that was assigned for this specific session.
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major
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The block device major number.
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name
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The name of the rbd image.
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pool
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The pool where this rbd image resides. The pool-name pair is unique
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per rados system.
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size
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The size (in bytes) of the mapped block device.
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refresh
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Writing to this file will reread the image header data and set
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all relevant datastructures accordingly.
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current_snap
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The current snapshot for which the device is mapped.
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create_snap
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Create a snapshot:
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create
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rollback_snap
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Rolls back data to the specified snapshot. This goes over the entire
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list of rados blocks and sends a rollback command to each.
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback
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snap_*
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A directory per each snapshot
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
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-------------------------------------------------------------
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id
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The rados internal snapshot id assigned for this snapshot
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size
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The size of the image when this snapshot was taken.
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@ -21,80 +21,9 @@
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Instructions for use
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--------------------
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For usage instructions, please refer to:
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1) Map a Linux block device to an existing rbd image.
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/class/rbd/add
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The snapshot name can be "-" or omitted to map the image read/write.
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2) List all active blkdev<->object mappings.
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In this example, we have performed step #1 twice, creating two blkdevs,
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mapped to two separate rados objects in the rados rbd pool
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$ cat /sys/class/rbd/list
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#id major client_name pool name snap KB
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0 254 client4143 rbd foo - 1024000
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The columns, in order, are:
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- blkdev unique id
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- blkdev assigned major
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- rados client id
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- rados pool name
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- rados block device name
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- mapped snapshot ("-" if none)
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- device size in KB
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3) Create a snapshot.
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Usage: <blkdev id> <snapname>
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$ echo "0 mysnap" > /sys/class/rbd/snap_create
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4) Listing a snapshot.
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$ cat /sys/class/rbd/snaps_list
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#id snap KB
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0 - 1024000 (*)
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0 foo 1024000
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The columns, in order, are:
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- blkdev unique id
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- snapshot name, '-' means none (active read/write version)
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- size of device at time of snapshot
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- the (*) indicates this is the active version
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5) Rollback to snapshot.
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Usage: <blkdev id> <snapname>
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$ echo "0 mysnap" > /sys/class/rbd/snap_rollback
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6) Mapping an image using snapshot.
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A snapshot mapping is read-only. This is being done by passing
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snap=<snapname> to the options when adding a device.
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$ echo "192.168.0.1 name=admin,snap=mysnap rbd foo" > /sys/class/rbd/add
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7) Remove an active blkdev<->rbd image mapping.
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In this example, we remove the mapping with blkdev unique id 1.
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$ echo 1 > /sys/class/rbd/remove
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NOTE: The actual creation and deletion of rados objects is outside the scope
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of this driver.
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Documentation/ABI/testing/sysfs-bus-rbd
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*/
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@ -163,6 +92,14 @@ struct rbd_request {
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u64 len;
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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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size_t size;
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struct list_head node;
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u64 id;
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};
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/*
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* a single device
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*/
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@ -193,21 +130,60 @@ struct rbd_device {
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int read_only;
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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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};
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static struct bus_type rbd_bus_type = {
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.name = "rbd",
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};
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static spinlock_t node_lock; /* protects client get/put */
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static struct class *class_rbd; /* /sys/class/rbd */
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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 LIST_HEAD(rbd_client_list); /* clients */
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static int __rbd_init_snaps_header(struct rbd_device *rbd_dev);
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static void rbd_dev_release(struct device *dev);
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static ssize_t rbd_snap_rollback(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t size);
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static ssize_t rbd_snap_add(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count);
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static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev,
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struct rbd_snap *snap);;
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static struct rbd_device *dev_to_rbd(struct device *dev)
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{
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return container_of(dev, struct rbd_device, dev);
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}
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static struct device *rbd_get_dev(struct rbd_device *rbd_dev)
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{
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return get_device(&rbd_dev->dev);
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}
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static void rbd_put_dev(struct rbd_device *rbd_dev)
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{
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put_device(&rbd_dev->dev);
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}
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static int rbd_open(struct block_device *bdev, fmode_t mode)
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{
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struct gendisk *disk = bdev->bd_disk;
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struct rbd_device *rbd_dev = disk->private_data;
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rbd_get_dev(rbd_dev);
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set_device_ro(bdev, rbd_dev->read_only);
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if ((mode & FMODE_WRITE) && rbd_dev->read_only)
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@ -216,9 +192,19 @@ static int rbd_open(struct block_device *bdev, fmode_t mode)
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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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rbd_put_dev(rbd_dev);
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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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@ -361,7 +347,6 @@ static int rbd_header_from_disk(struct rbd_image_header *header,
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int ret = -ENOMEM;
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init_rwsem(&header->snap_rwsem);
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header->snap_names_len = le64_to_cpu(ondisk->snap_names_len);
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header->snapc = kmalloc(sizeof(struct ceph_snap_context) +
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snap_count *
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@ -1256,10 +1241,20 @@ static int rbd_header_add_snap(struct rbd_device *dev,
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return -ERANGE;
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}
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static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev)
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{
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struct rbd_snap *snap;
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while (!list_empty(&rbd_dev->snaps)) {
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snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node);
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__rbd_remove_snap_dev(rbd_dev, snap);
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}
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}
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/*
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* only read the first part of the ondisk header, without the snaps info
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*/
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static int rbd_update_snaps(struct rbd_device *rbd_dev)
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static int __rbd_update_snaps(struct rbd_device *rbd_dev)
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{
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int ret;
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struct rbd_image_header h;
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@ -1280,12 +1275,15 @@ static int rbd_update_snaps(struct rbd_device *rbd_dev)
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rbd_dev->header.total_snaps = h.total_snaps;
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rbd_dev->header.snapc = h.snapc;
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rbd_dev->header.snap_names = h.snap_names;
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rbd_dev->header.snap_names_len = h.snap_names_len;
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rbd_dev->header.snap_sizes = h.snap_sizes;
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rbd_dev->header.snapc->seq = snap_seq;
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ret = __rbd_init_snaps_header(rbd_dev);
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up_write(&rbd_dev->header.snap_rwsem);
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return 0;
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return ret;
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}
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static int rbd_init_disk(struct rbd_device *rbd_dev)
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@ -1300,6 +1298,11 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
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if (rc)
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return rc;
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/* no need to lock here, as rbd_dev is not registered yet */
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rc = __rbd_init_snaps_header(rbd_dev);
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if (rc)
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return rc;
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rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size);
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if (rc)
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return rc;
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@ -1343,54 +1346,360 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
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return rc;
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}
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/********************************************************************
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* /sys/class/rbd/
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* add map rados objects to blkdev
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* remove unmap rados objects
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* list show mappings
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*******************************************************************/
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/*
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sysfs
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*/
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static void class_rbd_release(struct class *cls)
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static ssize_t rbd_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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kfree(cls);
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size);
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}
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static ssize_t class_rbd_list(struct class *c,
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struct class_attribute *attr,
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char *data)
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static ssize_t rbd_major_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n = 0;
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struct list_head *tmp;
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int max = PAGE_SIZE;
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "%d\n", rbd_dev->major);
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}
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static ssize_t rbd_client_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client));
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}
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static ssize_t rbd_pool_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "%s\n", rbd_dev->pool_name);
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}
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static ssize_t rbd_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "%s\n", rbd_dev->obj);
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}
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static ssize_t rbd_snap_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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return sprintf(buf, "%s\n", rbd_dev->snap_name);
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}
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static ssize_t rbd_image_refresh(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t size)
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{
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struct rbd_device *rbd_dev = dev_to_rbd(dev);
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int rc;
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int ret = size;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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n += snprintf(data, max,
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"#id\tmajor\tclient_name\tpool\tname\tsnap\tKB\n");
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rc = __rbd_update_snaps(rbd_dev);
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if (rc < 0)
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ret = rc;
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list_for_each(tmp, &rbd_dev_list) {
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struct rbd_device *rbd_dev;
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mutex_unlock(&ctl_mutex);
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return ret;
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}
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rbd_dev = list_entry(tmp, struct rbd_device, node);
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n += snprintf(data+n, max-n,
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"%d\t%d\tclient%lld\t%s\t%s\t%s\t%lld\n",
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rbd_dev->id,
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rbd_dev->major,
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ceph_client_id(rbd_dev->client),
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rbd_dev->pool_name,
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rbd_dev->obj, rbd_dev->snap_name,
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rbd_dev->header.image_size >> 10);
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if (n == max)
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static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
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static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
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static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
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static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
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static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
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static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh);
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static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
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static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add);
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static DEVICE_ATTR(rollback_snap, S_IWUSR, NULL, rbd_snap_rollback);
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static struct attribute *rbd_attrs[] = {
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&dev_attr_size.attr,
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&dev_attr_major.attr,
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&dev_attr_client_id.attr,
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&dev_attr_pool.attr,
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&dev_attr_name.attr,
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&dev_attr_current_snap.attr,
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&dev_attr_refresh.attr,
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&dev_attr_create_snap.attr,
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&dev_attr_rollback_snap.attr,
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NULL
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};
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static struct attribute_group rbd_attr_group = {
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.attrs = rbd_attrs,
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};
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static const struct attribute_group *rbd_attr_groups[] = {
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&rbd_attr_group,
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NULL
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};
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static void rbd_sysfs_dev_release(struct device *dev)
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{
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}
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static struct device_type rbd_device_type = {
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.name = "rbd",
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.groups = rbd_attr_groups,
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.release = rbd_sysfs_dev_release,
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};
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/*
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sysfs - snapshots
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*/
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static ssize_t rbd_snap_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
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return sprintf(buf, "%lld\n", (long long)snap->size);
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}
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static ssize_t rbd_snap_id_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev);
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return sprintf(buf, "%lld\n", (long long)snap->id);
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||||
}
|
||||
|
||||
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 struct attribute *rbd_snap_attrs[] = {
|
||||
&dev_attr_snap_size.attr,
|
||||
&dev_attr_snap_id.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 void __rbd_remove_snap_dev(struct rbd_device *rbd_dev,
|
||||
struct rbd_snap *snap)
|
||||
{
|
||||
list_del(&snap->node);
|
||||
device_unregister(&snap->dev);
|
||||
}
|
||||
|
||||
static int rbd_register_snap_dev(struct rbd_device *rbd_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, "snap_%s", snap->name);
|
||||
ret = device_register(dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __rbd_add_snap_dev(struct rbd_device *rbd_dev,
|
||||
int i, const char *name,
|
||||
struct rbd_snap **snapp)
|
||||
{
|
||||
int ret;
|
||||
struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL);
|
||||
if (!snap)
|
||||
return -ENOMEM;
|
||||
snap->name = kstrdup(name, GFP_KERNEL);
|
||||
snap->size = rbd_dev->header.snap_sizes[i];
|
||||
snap->id = rbd_dev->header.snapc->snaps[i];
|
||||
if (device_is_registered(&rbd_dev->dev)) {
|
||||
ret = rbd_register_snap_dev(rbd_dev, snap,
|
||||
&rbd_dev->dev);
|
||||
if (ret < 0)
|
||||
goto err;
|
||||
}
|
||||
*snapp = snap;
|
||||
return 0;
|
||||
err:
|
||||
kfree(snap->name);
|
||||
kfree(snap);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* search for the previous snap in a null delimited string list
|
||||
*/
|
||||
const char *rbd_prev_snap_name(const char *name, const char *start)
|
||||
{
|
||||
if (name < start + 2)
|
||||
return NULL;
|
||||
|
||||
name -= 2;
|
||||
while (*name) {
|
||||
if (name == start)
|
||||
return start;
|
||||
name--;
|
||||
}
|
||||
return name + 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* compare the old list of snapshots that we have to what's in the header
|
||||
* and update it accordingly. Note that the header holds the snapshots
|
||||
* in a reverse order (from newest to oldest) and we need to go from
|
||||
* older to new so that we don't get a duplicate snap name when
|
||||
* doing the process (e.g., removed snapshot and recreated a new
|
||||
* one with the same name.
|
||||
*/
|
||||
static int __rbd_init_snaps_header(struct rbd_device *rbd_dev)
|
||||
{
|
||||
const char *name, *first_name;
|
||||
int i = rbd_dev->header.total_snaps;
|
||||
struct rbd_snap *snap, *old_snap = NULL;
|
||||
int ret;
|
||||
struct list_head *p, *n;
|
||||
|
||||
first_name = rbd_dev->header.snap_names;
|
||||
name = first_name + rbd_dev->header.snap_names_len;
|
||||
|
||||
list_for_each_prev_safe(p, n, &rbd_dev->snaps) {
|
||||
u64 cur_id;
|
||||
|
||||
old_snap = list_entry(p, struct rbd_snap, node);
|
||||
|
||||
if (i)
|
||||
cur_id = rbd_dev->header.snapc->snaps[i - 1];
|
||||
|
||||
if (!i || old_snap->id < cur_id) {
|
||||
/* old_snap->id was skipped, thus was removed */
|
||||
__rbd_remove_snap_dev(rbd_dev, old_snap);
|
||||
continue;
|
||||
}
|
||||
if (old_snap->id == cur_id) {
|
||||
/* we have this snapshot already */
|
||||
i--;
|
||||
name = rbd_prev_snap_name(name, first_name);
|
||||
continue;
|
||||
}
|
||||
for (; i > 0;
|
||||
i--, name = rbd_prev_snap_name(name, first_name)) {
|
||||
if (!name) {
|
||||
WARN_ON(1);
|
||||
return -EINVAL;
|
||||
}
|
||||
cur_id = rbd_dev->header.snapc->snaps[i];
|
||||
/* snapshot removal? handle it above */
|
||||
if (cur_id >= old_snap->id)
|
||||
break;
|
||||
/* a new snapshot */
|
||||
ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* note that we add it backward so using n and not p */
|
||||
list_add(&snap->node, n);
|
||||
p = &snap->node;
|
||||
}
|
||||
}
|
||||
/* we're done going over the old snap list, just add what's left */
|
||||
for (; i > 0; i--) {
|
||||
name = rbd_prev_snap_name(name, first_name);
|
||||
if (!name) {
|
||||
WARN_ON(1);
|
||||
return -EINVAL;
|
||||
}
|
||||
ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
list_add(&snap->node, &rbd_dev->snaps);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static void rbd_root_dev_release(struct device *dev)
|
||||
{
|
||||
}
|
||||
|
||||
static struct device rbd_root_dev = {
|
||||
.init_name = "rbd",
|
||||
.release = rbd_root_dev_release,
|
||||
};
|
||||
|
||||
static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
|
||||
{
|
||||
int ret = -ENOMEM;
|
||||
struct device *dev;
|
||||
struct rbd_snap *snap;
|
||||
|
||||
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->id);
|
||||
ret = device_register(dev);
|
||||
if (ret < 0)
|
||||
goto done_free;
|
||||
|
||||
list_for_each_entry(snap, &rbd_dev->snaps, node) {
|
||||
ret = rbd_register_snap_dev(rbd_dev, snap,
|
||||
&rbd_dev->dev);
|
||||
if (ret < 0)
|
||||
break;
|
||||
}
|
||||
|
||||
mutex_unlock(&ctl_mutex);
|
||||
return n;
|
||||
return 0;
|
||||
done_free:
|
||||
mutex_unlock(&ctl_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_add(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
|
||||
{
|
||||
device_unregister(&rbd_dev->dev);
|
||||
}
|
||||
|
||||
static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count)
|
||||
{
|
||||
struct ceph_osd_client *osdc;
|
||||
struct rbd_device *rbd_dev;
|
||||
|
|
@ -1419,6 +1728,7 @@ static ssize_t class_rbd_add(struct class *c,
|
|||
/* static rbd_device initialization */
|
||||
spin_lock_init(&rbd_dev->lock);
|
||||
INIT_LIST_HEAD(&rbd_dev->node);
|
||||
INIT_LIST_HEAD(&rbd_dev->snaps);
|
||||
|
||||
/* generate unique id: find highest unique id, add one */
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
|
@ -1478,6 +1788,9 @@ static ssize_t class_rbd_add(struct class *c,
|
|||
}
|
||||
rbd_dev->major = irc;
|
||||
|
||||
rc = rbd_bus_add_dev(rbd_dev);
|
||||
if (rc)
|
||||
goto err_out_disk;
|
||||
/* set up and announce blkdev mapping */
|
||||
rc = rbd_init_disk(rbd_dev);
|
||||
if (rc)
|
||||
|
|
@ -1487,6 +1800,8 @@ static ssize_t class_rbd_add(struct class *c,
|
|||
|
||||
err_out_blkdev:
|
||||
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
||||
err_out_disk:
|
||||
rbd_free_disk(rbd_dev);
|
||||
err_out_client:
|
||||
rbd_put_client(rbd_dev);
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
|
@ -1518,35 +1833,10 @@ static struct rbd_device *__rbd_get_dev(unsigned long id)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_remove(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
static void rbd_dev_release(struct device *dev)
|
||||
{
|
||||
struct rbd_device *rbd_dev = NULL;
|
||||
int target_id, rc;
|
||||
unsigned long ul;
|
||||
|
||||
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;
|
||||
|
||||
/* remove object from list immediately */
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
||||
rbd_dev = __rbd_get_dev(target_id);
|
||||
if (rbd_dev)
|
||||
list_del_init(&rbd_dev->node);
|
||||
|
||||
mutex_unlock(&ctl_mutex);
|
||||
|
||||
if (!rbd_dev)
|
||||
return -ENOENT;
|
||||
struct rbd_device *rbd_dev =
|
||||
container_of(dev, struct rbd_device, dev);
|
||||
|
||||
rbd_put_client(rbd_dev);
|
||||
|
||||
|
|
@ -1557,67 +1847,11 @@ static ssize_t class_rbd_remove(struct class *c,
|
|||
|
||||
/* release module ref */
|
||||
module_put(THIS_MODULE);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_snaps_list(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
char *data)
|
||||
{
|
||||
struct rbd_device *rbd_dev = NULL;
|
||||
struct list_head *tmp;
|
||||
struct rbd_image_header *header;
|
||||
int i, n = 0, max = PAGE_SIZE;
|
||||
int ret;
|
||||
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
||||
n += snprintf(data, max, "#id\tsnap\tKB\n");
|
||||
|
||||
list_for_each(tmp, &rbd_dev_list) {
|
||||
char *names, *p;
|
||||
struct ceph_snap_context *snapc;
|
||||
|
||||
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
||||
header = &rbd_dev->header;
|
||||
|
||||
down_read(&header->snap_rwsem);
|
||||
|
||||
names = header->snap_names;
|
||||
snapc = header->snapc;
|
||||
|
||||
n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n",
|
||||
rbd_dev->id, RBD_SNAP_HEAD_NAME,
|
||||
header->image_size >> 10,
|
||||
(!rbd_dev->cur_snap ? " (*)" : ""));
|
||||
if (n == max)
|
||||
break;
|
||||
|
||||
p = names;
|
||||
for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) {
|
||||
n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n",
|
||||
rbd_dev->id, p, header->snap_sizes[i] >> 10,
|
||||
(rbd_dev->cur_snap &&
|
||||
(snap_index(header, i) == rbd_dev->cur_snap) ?
|
||||
" (*)" : ""));
|
||||
if (n == max)
|
||||
break;
|
||||
}
|
||||
|
||||
up_read(&header->snap_rwsem);
|
||||
}
|
||||
|
||||
|
||||
ret = n;
|
||||
mutex_unlock(&ctl_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_snaps_refresh(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
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;
|
||||
|
|
@ -1641,94 +1875,69 @@ static ssize_t class_rbd_snaps_refresh(struct class *c,
|
|||
goto done;
|
||||
}
|
||||
|
||||
rc = rbd_update_snaps(rbd_dev);
|
||||
if (rc < 0)
|
||||
ret = rc;
|
||||
list_del_init(&rbd_dev->node);
|
||||
|
||||
__rbd_remove_all_snaps(rbd_dev);
|
||||
rbd_bus_del_dev(rbd_dev);
|
||||
|
||||
done:
|
||||
mutex_unlock(&ctl_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_snap_create(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
static ssize_t rbd_snap_add(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
{
|
||||
struct rbd_device *rbd_dev = NULL;
|
||||
int target_id, ret;
|
||||
char *name;
|
||||
|
||||
name = kmalloc(RBD_MAX_SNAP_NAME_LEN + 1, GFP_KERNEL);
|
||||
struct rbd_device *rbd_dev = dev_to_rbd(dev);
|
||||
int ret;
|
||||
char *name = kmalloc(count + 1, GFP_KERNEL);
|
||||
if (!name)
|
||||
return -ENOMEM;
|
||||
|
||||
/* parse snaps add command */
|
||||
if (sscanf(buf, "%d "
|
||||
"%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s",
|
||||
&target_id,
|
||||
name) != 2) {
|
||||
ret = -EINVAL;
|
||||
goto done;
|
||||
}
|
||||
snprintf(name, count, "%s", buf);
|
||||
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
||||
rbd_dev = __rbd_get_dev(target_id);
|
||||
if (!rbd_dev) {
|
||||
ret = -ENOENT;
|
||||
goto done_unlock;
|
||||
}
|
||||
|
||||
ret = rbd_header_add_snap(rbd_dev,
|
||||
name, GFP_KERNEL);
|
||||
if (ret < 0)
|
||||
goto done_unlock;
|
||||
|
||||
ret = rbd_update_snaps(rbd_dev);
|
||||
ret = __rbd_update_snaps(rbd_dev);
|
||||
if (ret < 0)
|
||||
goto done_unlock;
|
||||
|
||||
ret = count;
|
||||
done_unlock:
|
||||
mutex_unlock(&ctl_mutex);
|
||||
done:
|
||||
kfree(name);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t class_rbd_rollback(struct class *c,
|
||||
struct class_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
static ssize_t rbd_snap_rollback(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
{
|
||||
struct rbd_device *rbd_dev = NULL;
|
||||
int target_id, ret;
|
||||
struct rbd_device *rbd_dev = dev_to_rbd(dev);
|
||||
int ret;
|
||||
u64 snapid;
|
||||
char snap_name[RBD_MAX_SNAP_NAME_LEN];
|
||||
u64 cur_ofs;
|
||||
char *seg_name;
|
||||
|
||||
/* parse snaps add command */
|
||||
if (sscanf(buf, "%d "
|
||||
"%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s",
|
||||
&target_id,
|
||||
snap_name) != 2) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
char *seg_name = NULL;
|
||||
char *snap_name = kmalloc(count + 1, GFP_KERNEL);
|
||||
ret = -ENOMEM;
|
||||
seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO);
|
||||
if (!seg_name)
|
||||
if (!snap_name)
|
||||
return ret;
|
||||
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
/* parse snaps add command */
|
||||
snprintf(snap_name, count, "%s", buf);
|
||||
seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO);
|
||||
if (!seg_name)
|
||||
goto done;
|
||||
|
||||
rbd_dev = __rbd_get_dev(target_id);
|
||||
if (!rbd_dev) {
|
||||
ret = -ENOENT;
|
||||
goto done_unlock;
|
||||
}
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
|
||||
ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL);
|
||||
if (ret < 0)
|
||||
|
|
@ -1750,7 +1959,7 @@ static ssize_t class_rbd_rollback(struct class *c,
|
|||
seg_name, ret);
|
||||
}
|
||||
|
||||
ret = rbd_update_snaps(rbd_dev);
|
||||
ret = __rbd_update_snaps(rbd_dev);
|
||||
if (ret < 0)
|
||||
goto done_unlock;
|
||||
|
||||
|
|
@ -1758,57 +1967,42 @@ static ssize_t class_rbd_rollback(struct class *c,
|
|||
|
||||
done_unlock:
|
||||
mutex_unlock(&ctl_mutex);
|
||||
done:
|
||||
kfree(seg_name);
|
||||
kfree(snap_name);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct class_attribute class_rbd_attrs[] = {
|
||||
__ATTR(add, 0200, NULL, class_rbd_add),
|
||||
__ATTR(remove, 0200, NULL, class_rbd_remove),
|
||||
__ATTR(list, 0444, class_rbd_list, NULL),
|
||||
__ATTR(snaps_refresh, 0200, NULL, class_rbd_snaps_refresh),
|
||||
__ATTR(snap_create, 0200, NULL, class_rbd_snap_create),
|
||||
__ATTR(snaps_list, 0444, class_rbd_snaps_list, NULL),
|
||||
__ATTR(snap_rollback, 0200, NULL, class_rbd_rollback),
|
||||
static struct bus_attribute rbd_bus_attrs[] = {
|
||||
__ATTR(add, S_IWUSR, NULL, rbd_add),
|
||||
__ATTR(remove, S_IWUSR, NULL, rbd_remove),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
/*
|
||||
* create control files in sysfs
|
||||
* /sys/class/rbd/...
|
||||
* /sys/bus/rbd/...
|
||||
*/
|
||||
static int rbd_sysfs_init(void)
|
||||
{
|
||||
int ret = -ENOMEM;
|
||||
int ret;
|
||||
|
||||
class_rbd = kzalloc(sizeof(*class_rbd), GFP_KERNEL);
|
||||
if (!class_rbd)
|
||||
goto out;
|
||||
rbd_bus_type.bus_attrs = rbd_bus_attrs;
|
||||
|
||||
class_rbd->name = DRV_NAME;
|
||||
class_rbd->owner = THIS_MODULE;
|
||||
class_rbd->class_release = class_rbd_release;
|
||||
class_rbd->class_attrs = class_rbd_attrs;
|
||||
ret = bus_register(&rbd_bus_type);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = class_register(class_rbd);
|
||||
if (ret)
|
||||
goto out_class;
|
||||
return 0;
|
||||
ret = device_register(&rbd_root_dev);
|
||||
|
||||
out_class:
|
||||
kfree(class_rbd);
|
||||
class_rbd = NULL;
|
||||
pr_err(DRV_NAME ": failed to create class rbd\n");
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void rbd_sysfs_cleanup(void)
|
||||
{
|
||||
if (class_rbd)
|
||||
class_destroy(class_rbd);
|
||||
class_rbd = NULL;
|
||||
device_unregister(&rbd_root_dev);
|
||||
bus_unregister(&rbd_bus_type);
|
||||
}
|
||||
|
||||
int __init rbd_init(void)
|
||||
|
|
|
|||
Loading…
Reference in New Issue