Loading Documentation/ABI/testing/sysfs-bus-rbd 0 → 100644 +83 −0 Original line number Diff line number Diff line What: /sys/bus/rbd/ Date: November 2010 Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, Sage Weil <sage@newdream.net> Description: Being used for adding and removing rbd block devices. Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> will be assigned for any registered block device. If snapshot is used, it will be mapped read-only. Removal of a device: $ echo <dev-id> > /sys/bus/rbd/remove Entries under /sys/bus/rbd/devices/<dev-id>/ -------------------------------------------- client_id The ceph unique client id that was assigned for this specific session. major The block device major number. name The name of the rbd image. pool The pool where this rbd image resides. The pool-name pair is unique per rados system. size The size (in bytes) of the mapped block device. refresh Writing to this file will reread the image header data and set all relevant datastructures accordingly. current_snap The current snapshot for which the device is mapped. create_snap Create a snapshot: $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create rollback_snap Rolls back data to the specified snapshot. This goes over the entire list of rados blocks and sends a rollback command to each. $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback snap_* A directory per each snapshot Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> ------------------------------------------------------------- id The rados internal snapshot id assigned for this snapshot size The size of the image when this snapshot was taken. Documentation/driver-model/interface.txtdeleted 100644 → 0 +0 −129 Original line number Diff line number Diff line Device Interfaces Introduction ~~~~~~~~~~~~ Device interfaces are the logical interfaces of device classes that correlate directly to userspace interfaces, like device nodes. Each device class may have multiple interfaces through which you can access the same device. An input device may support the mouse interface, the 'evdev' interface, and the touchscreen interface. A SCSI disk would support the disk interface, the SCSI generic interface, and possibly a raw device interface. Device interfaces are registered with the class they belong to. As devices are added to the class, they are added to each interface registered with the class. The interface is responsible for determining whether the device supports the interface or not. Programming Interface ~~~~~~~~~~~~~~~~~~~~~ struct device_interface { char * name; rwlock_t lock; u32 devnum; struct device_class * devclass; struct list_head node; struct driver_dir_entry dir; int (*add_device)(struct device *); int (*add_device)(struct intf_data *); }; int interface_register(struct device_interface *); void interface_unregister(struct device_interface *); An interface must specify the device class it belongs to. It is added to that class's list of interfaces on registration. Interfaces can be added to a device class at any time. Whenever it is added, each device in the class is passed to the interface's add_device callback. When an interface is removed, each device is removed from the interface. Devices ~~~~~~~ Once a device is added to a device class, it is added to each interface that is registered with the device class. The class is expected to place a class-specific data structure in struct device::class_data. The interface can use that (along with other fields of struct device) to determine whether or not the driver and/or device support that particular interface. Data ~~~~ struct intf_data { struct list_head node; struct device_interface * intf; struct device * dev; u32 intf_num; }; int interface_add_data(struct interface_data *); The interface is responsible for allocating and initializing a struct intf_data and calling interface_add_data() to add it to the device's list of interfaces it belongs to. This list will be iterated over when the device is removed from the class (instead of all possible interfaces for a class). This structure should probably be embedded in whatever per-device data structure the interface is allocating anyway. Devices are enumerated within the interface. This happens in interface_add_data() and the enumerated value is stored in the struct intf_data for that device. sysfs ~~~~~ Each interface is given a directory in the directory of the device class it belongs to: Interfaces get a directory in the class's directory as well: class/ `-- input |-- devices |-- drivers |-- mouse `-- evdev When a device is added to the interface, a symlink is created that points to the device's directory in the physical hierarchy: class/ `-- input |-- devices | `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ |-- drivers | `-- usb:usb_mouse -> ../../../bus/drivers/usb_mouse/ |-- mouse | `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ `-- evdev `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ Future Plans ~~~~~~~~~~~~ A device interface is correlated directly with a userspace interface for a device, specifically a device node. For instance, a SCSI disk exposes at least two interfaces to userspace: the standard SCSI disk interface and the SCSI generic interface. It might also export a raw device interface. Many interfaces have a major number associated with them and each device gets a minor number. Or, multiple interfaces might share one major number, and each will receive a range of minor numbers (like in the case of input devices). These major and minor numbers could be stored in the interface structure. Major and minor allocations could happen when the interface is registered with the class, or via a helper function. Documentation/filesystems/vfs.txt +4 −5 Original line number Diff line number Diff line Loading @@ -660,11 +660,10 @@ struct address_space_operations { releasepage: releasepage is called on PagePrivate pages to indicate that the page should be freed if possible. ->releasepage should remove any private data from the page and clear the PagePrivate flag. It may also remove the page from the address_space. If this fails for some reason, it may indicate failure with a 0 return value. This is used in two distinct though related cases. The first is when the VM finds a clean page with no active users and PagePrivate flag. If releasepage() fails for some reason, it must indicate failure with a 0 return value. releasepage() is used in two distinct though related cases. The first is when the VM finds a clean page with no active users and wants to make it a free page. If ->releasepage succeeds, the page will be removed from the address_space and become free. Loading MAINTAINERS +3 −4 Original line number Diff line number Diff line Loading @@ -2060,7 +2060,7 @@ F: Documentation/blockdev/drbd/ DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS M: Greg Kroah-Hartman <gregkh@suse.de> T: quilt kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/ T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6.git S: Supported F: Documentation/kobject.txt F: drivers/base/ Loading @@ -2080,7 +2080,7 @@ F: include/drm/ INTEL DRM DRIVERS (excluding Poulsbo, Moorestown and derivative chipsets) M: Chris Wilson <chris@chris-wilson.co.uk> L: intel-gfx@lists.freedesktop.org L: intel-gfx@lists.freedesktop.org (subscribers-only) L: dri-devel@lists.freedesktop.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel.git S: Supported Loading Loading @@ -4064,9 +4064,8 @@ F: drivers/scsi/NCR_D700.* NETEFFECT IWARP RNIC DRIVER (IW_NES) M: Faisal Latif <faisal.latif@intel.com> M: Chien Tung <chien.tin.tung@intel.com> L: linux-rdma@vger.kernel.org W: http://www.neteffect.com W: http://www.intel.com/Products/Server/Adapters/Server-Cluster/Server-Cluster-overview.htm S: Supported F: drivers/infiniband/hw/nes/ Loading Makefile +1 −1 Original line number Diff line number Diff line VERSION = 2 PATCHLEVEL = 6 SUBLEVEL = 37 EXTRAVERSION = -rc4 EXTRAVERSION = -rc5 NAME = Flesh-Eating Bats with Fangs # *DOCUMENTATION* Loading Loading
Documentation/ABI/testing/sysfs-bus-rbd 0 → 100644 +83 −0 Original line number Diff line number Diff line What: /sys/bus/rbd/ Date: November 2010 Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, Sage Weil <sage@newdream.net> Description: Being used for adding and removing rbd block devices. Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> will be assigned for any registered block device. If snapshot is used, it will be mapped read-only. Removal of a device: $ echo <dev-id> > /sys/bus/rbd/remove Entries under /sys/bus/rbd/devices/<dev-id>/ -------------------------------------------- client_id The ceph unique client id that was assigned for this specific session. major The block device major number. name The name of the rbd image. pool The pool where this rbd image resides. The pool-name pair is unique per rados system. size The size (in bytes) of the mapped block device. refresh Writing to this file will reread the image header data and set all relevant datastructures accordingly. current_snap The current snapshot for which the device is mapped. create_snap Create a snapshot: $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create rollback_snap Rolls back data to the specified snapshot. This goes over the entire list of rados blocks and sends a rollback command to each. $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback snap_* A directory per each snapshot Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> ------------------------------------------------------------- id The rados internal snapshot id assigned for this snapshot size The size of the image when this snapshot was taken.
Documentation/driver-model/interface.txtdeleted 100644 → 0 +0 −129 Original line number Diff line number Diff line Device Interfaces Introduction ~~~~~~~~~~~~ Device interfaces are the logical interfaces of device classes that correlate directly to userspace interfaces, like device nodes. Each device class may have multiple interfaces through which you can access the same device. An input device may support the mouse interface, the 'evdev' interface, and the touchscreen interface. A SCSI disk would support the disk interface, the SCSI generic interface, and possibly a raw device interface. Device interfaces are registered with the class they belong to. As devices are added to the class, they are added to each interface registered with the class. The interface is responsible for determining whether the device supports the interface or not. Programming Interface ~~~~~~~~~~~~~~~~~~~~~ struct device_interface { char * name; rwlock_t lock; u32 devnum; struct device_class * devclass; struct list_head node; struct driver_dir_entry dir; int (*add_device)(struct device *); int (*add_device)(struct intf_data *); }; int interface_register(struct device_interface *); void interface_unregister(struct device_interface *); An interface must specify the device class it belongs to. It is added to that class's list of interfaces on registration. Interfaces can be added to a device class at any time. Whenever it is added, each device in the class is passed to the interface's add_device callback. When an interface is removed, each device is removed from the interface. Devices ~~~~~~~ Once a device is added to a device class, it is added to each interface that is registered with the device class. The class is expected to place a class-specific data structure in struct device::class_data. The interface can use that (along with other fields of struct device) to determine whether or not the driver and/or device support that particular interface. Data ~~~~ struct intf_data { struct list_head node; struct device_interface * intf; struct device * dev; u32 intf_num; }; int interface_add_data(struct interface_data *); The interface is responsible for allocating and initializing a struct intf_data and calling interface_add_data() to add it to the device's list of interfaces it belongs to. This list will be iterated over when the device is removed from the class (instead of all possible interfaces for a class). This structure should probably be embedded in whatever per-device data structure the interface is allocating anyway. Devices are enumerated within the interface. This happens in interface_add_data() and the enumerated value is stored in the struct intf_data for that device. sysfs ~~~~~ Each interface is given a directory in the directory of the device class it belongs to: Interfaces get a directory in the class's directory as well: class/ `-- input |-- devices |-- drivers |-- mouse `-- evdev When a device is added to the interface, a symlink is created that points to the device's directory in the physical hierarchy: class/ `-- input |-- devices | `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ |-- drivers | `-- usb:usb_mouse -> ../../../bus/drivers/usb_mouse/ |-- mouse | `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ `-- evdev `-- 1 -> ../../../root/pci0/00:1f.0/usb_bus/00:1f.2-1:0/ Future Plans ~~~~~~~~~~~~ A device interface is correlated directly with a userspace interface for a device, specifically a device node. For instance, a SCSI disk exposes at least two interfaces to userspace: the standard SCSI disk interface and the SCSI generic interface. It might also export a raw device interface. Many interfaces have a major number associated with them and each device gets a minor number. Or, multiple interfaces might share one major number, and each will receive a range of minor numbers (like in the case of input devices). These major and minor numbers could be stored in the interface structure. Major and minor allocations could happen when the interface is registered with the class, or via a helper function.
Documentation/filesystems/vfs.txt +4 −5 Original line number Diff line number Diff line Loading @@ -660,11 +660,10 @@ struct address_space_operations { releasepage: releasepage is called on PagePrivate pages to indicate that the page should be freed if possible. ->releasepage should remove any private data from the page and clear the PagePrivate flag. It may also remove the page from the address_space. If this fails for some reason, it may indicate failure with a 0 return value. This is used in two distinct though related cases. The first is when the VM finds a clean page with no active users and PagePrivate flag. If releasepage() fails for some reason, it must indicate failure with a 0 return value. releasepage() is used in two distinct though related cases. The first is when the VM finds a clean page with no active users and wants to make it a free page. If ->releasepage succeeds, the page will be removed from the address_space and become free. Loading
MAINTAINERS +3 −4 Original line number Diff line number Diff line Loading @@ -2060,7 +2060,7 @@ F: Documentation/blockdev/drbd/ DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS M: Greg Kroah-Hartman <gregkh@suse.de> T: quilt kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/ T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6.git S: Supported F: Documentation/kobject.txt F: drivers/base/ Loading @@ -2080,7 +2080,7 @@ F: include/drm/ INTEL DRM DRIVERS (excluding Poulsbo, Moorestown and derivative chipsets) M: Chris Wilson <chris@chris-wilson.co.uk> L: intel-gfx@lists.freedesktop.org L: intel-gfx@lists.freedesktop.org (subscribers-only) L: dri-devel@lists.freedesktop.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel.git S: Supported Loading Loading @@ -4064,9 +4064,8 @@ F: drivers/scsi/NCR_D700.* NETEFFECT IWARP RNIC DRIVER (IW_NES) M: Faisal Latif <faisal.latif@intel.com> M: Chien Tung <chien.tin.tung@intel.com> L: linux-rdma@vger.kernel.org W: http://www.neteffect.com W: http://www.intel.com/Products/Server/Adapters/Server-Cluster/Server-Cluster-overview.htm S: Supported F: drivers/infiniband/hw/nes/ Loading
Makefile +1 −1 Original line number Diff line number Diff line VERSION = 2 PATCHLEVEL = 6 SUBLEVEL = 37 EXTRAVERSION = -rc4 EXTRAVERSION = -rc5 NAME = Flesh-Eating Bats with Fangs # *DOCUMENTATION* Loading
