diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-rbd | 83 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-asus-laptop | 16 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-eeepc-wmi | 10 | ||||
| -rw-r--r-- | Documentation/driver-model/interface.txt | 129 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 9 |
5 files changed, 112 insertions, 135 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-rbd b/Documentation/ABI/testing/sysfs-bus-rbd new file mode 100644 index 0000000..90a87e2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-rbd @@ -0,0 +1,83 @@ +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. + + diff --git a/Documentation/ABI/testing/sysfs-platform-asus-laptop b/Documentation/ABI/testing/sysfs-platform-asus-laptop index 1d77539..41ff8ae 100644 --- a/Documentation/ABI/testing/sysfs-platform-asus-laptop +++ b/Documentation/ABI/testing/sysfs-platform-asus-laptop @@ -47,6 +47,20 @@ Date: January 2007 KernelVersion: 2.6.20 Contact: "Corentin Chary" <corentincj@iksaif.net> Description: - Control the bluetooth device. 1 means on, 0 means off. + Control the wlan device. 1 means on, 0 means off. This may control the led, the device or both. Users: Lapsus + +What: /sys/devices/platform/asus_laptop/wimax +Date: October 2010 +KernelVersion: 2.6.37 +Contact: "Corentin Chary" <corentincj@iksaif.net> +Description: + Control the wimax device. 1 means on, 0 means off. + +What: /sys/devices/platform/asus_laptop/wwan +Date: October 2010 +KernelVersion: 2.6.37 +Contact: "Corentin Chary" <corentincj@iksaif.net> +Description: + Control the wwan (3G) device. 1 means on, 0 means off. diff --git a/Documentation/ABI/testing/sysfs-platform-eeepc-wmi b/Documentation/ABI/testing/sysfs-platform-eeepc-wmi new file mode 100644 index 0000000..e4b5fef --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-eeepc-wmi @@ -0,0 +1,10 @@ +What: /sys/devices/platform/eeepc-wmi/cpufv +Date: Oct 2010 +KernelVersion: 2.6.37 +Contact: "Corentin Chary" <corentincj@iksaif.net> +Description: + Change CPU clock configuration (write-only). + There are three available clock configuration: + * 0 -> Super Performance Mode + * 1 -> High Performance Mode + * 2 -> Power Saving Mode diff --git a/Documentation/driver-model/interface.txt b/Documentation/driver-model/interface.txt deleted file mode 100644 index c66912bf..0000000 --- a/Documentation/driver-model/interface.txt +++ /dev/null @@ -1,129 +0,0 @@ - -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. - diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 3b14a55..20899e0 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -661,11 +661,10 @@ 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. |
