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* [PATCH] md: make md_print_devices() staticAdrian Bunk2006-06-26
| | | | | | | | | This patch makes the needlessly global md_print_devices() static. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: support stripe/offset mode in raid10NeilBrown2006-06-26
| | | | | | | | | | | | | | | | | | | | The "industry standard" DDF format allows for a stripe/offset layout where data is duplicated on different stripes. e.g. A B C D D A B C E F G H H E F G (columns are drives, rows are stripes, LETTERS are chunks of data). This is similar to raid10's 'far' mode, but not quite the same. So enhance 'far' mode with a 'far/offset' option which follows the layout of DDFs stripe/offset. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: allow a linear array to have drives added while activeNeilBrown2006-06-26
| | | | | | Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: allow checkpoint of recovery with version-1 superblockNeilBrown2006-06-26
| | | | | | | | | | | | | For a while we have had checkpointing of resync. The version-1 superblock allows recovery to be checkpointed as well, and this patch implements that. Due to early carelessness we need to add a feature flag to signal that the recovery_offset field is in use, otherwise older kernels would assume that a partially recovered array is in fact fully recovered. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: remove nuisance message at shutdownNeilBrown2006-06-26
| | | | | | | | | | | At shutdown, we switch all arrays to read-only, which creates a message for every instantiated array, even those which aren't actually active. So remove the message for non-active arrays. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: merge raid5 and raid6 codeNeilBrown2006-06-26
| | | | | | | | | | | | | | There is a lot of commonality between raid5.c and raid6main.c. This patches merges both into one module called raid456. This saves a lot of code, and paves the way for online raid5->raid6 migrations. There is still duplication, e.g. between handle_stripe5 and handle_stripe6. This will probably be cleaned up later. Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: increase the delay before marking metadata clean, and make it ↵NeilBrown2006-06-26
| | | | | | | | | | | | | configurable When a md array has been idle (no writes) for 20msecs it is marked as 'clean'. This delay turns out to be too short for some real workloads. So increase it to 200msec (the time to update the metadata should be a tiny fraction of that) and make it sysfs-configurable. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: remove useless ioctl warningNeilBrown2006-06-26
| | | | | | | | | | This warning was slightly useful back in 2.2 days, but is more an annoyance now. It makes it awkward to add new ioctls (that we we are likely to do that in the current climate, but it is possible). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: remove arbitrary limit on chunk sizeNeilBrown2006-06-26
| | | | | | | | | | | The largest chunk size the code can support without substantial surgery is 2^30 bytes, so make that the limit instead of an arbitrary 4Meg. Some day, the 'chunksize' should change to a sector-shift instead of a byte-count. Then no limit would be needed. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] md: reformat code in raid1_end_write_request to avoid gotoNeilBrown2006-06-26
| | | | | | | | | A recent change made this goto unnecessary, so reformat the code to make it clearer what is happening. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: improve error message consistencyAlasdair G Kergon2006-06-26
| | | | | | | | | Tidy device-mapper error messages to include context information automatically. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: prevent removal if openAlasdair G Kergon2006-06-26
| | | | | | | | | | | | | | | | | If you misuse the device-mapper interface (or there's a bug in your userspace tools) it's possible to end up with 'unlinked' mapped devices that cannot be removed until you reboot (along with uninterruptible processes). This patch prevents you from removing a device that is still open. It introduces dm_lock_for_deletion() which is called when a device is about to be removed to ensure that nothing has it open and nothing further can open it. It uses a private open_count for this which also lets us remove one of the problematic bdget_disk() calls elsewhere. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: create error tableDavid Teigland2006-06-26
| | | | | | | | | Add a library function dm_create_error_table() to create a table that rejects any I/O sent to a device with EIO. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: add exportsAlasdair G Kergon2006-06-26
| | | | | | | | | | | | | Move definitions of core device-mapper functions for manipulating mapped devices and their tables to <linux/device-mapper.h> advertising their availability for use elsewhere in the kernel. Protect the contents of device-mapper.h with ifdef __KERNEL__. And throw in a few formatting clean-ups and extra comments. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: consolidate creation functionsAlasdair G Kergon2006-06-26
| | | | | | | | | Merge dm_create() and dm_create_with_minor() by introducing the special value DM_ANY_MINOR to request the allocation of the next available minor number. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm table split_args: handle no inputDavid Teigland2006-06-26
| | | | | | | | | Return sense if dm_split_args is called with a NULL input parameter. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm kcopyd: error accumulation fixJonathan Brassow2006-06-26
| | | | | | | | | | | | | kcopyd should accumulate errors - otherwise I/O failures may be ignored unintentionally. And invert 'success' (used in a future patch), using a more intuitive !(read_err || write_err). Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm mirror log: sync_count fixAlasdair G Kergon2006-06-26
| | | | | | | | | When a mirror is reduced in size, clear the part of the bitmap that is no longer used. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm mirror log: bitset_size fixAlasdair G Kergon2006-06-26
| | | | | | | | | Fix the 'sizeof' in the region log bitmap size calculation: it's uint32_t, not unsigned long - this breaks on some archs. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm mirror log: refactor contextAlasdair G Kergon2006-06-26
| | | | | | | | | Refactor the code that creates the core and disk log contexts to avoid the repeated allocation of clean_bits introduced by the last patch. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm mirror log: sector size fixKevin Corry2006-06-26
| | | | | | | | | | | | | | | | On-disk logs for dm-mirror devices are currently hard-coded to use 512 byte hard-sector-sizes. This patch fixes dm-log so it will work with devices with non-512-byte hard-sector-sizes. To maintain full compatibility, instead of moving the clean-bits bitset to a bitset, and enlarges the disk-header buffer to encompass both the header and the bitset. The I/O routines for the bitset are removed, and the I/O routines for the disk-header now also read/write the bitset. Signed-off-by: Kevin Corry <kevcorry@us.ibm.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm table: get_target: fix last indexMilan Broz2006-06-26
| | | | | | | | | | | | The table is indexed from 0, so an index equal to t->num_targets should be rejected. (There is no code in the current tree that would exercise this bug.) Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: mirror sector offset fixNeil Brown2006-06-26
| | | | | | | | | | | | | | | | | | The device-mapper core does not perform any remapping of bios before passing them to the targets. If a particular mapping begins part-way into a device, targets obtain the sector relative to the start of the mapping by subtracting ti->begin. The dm-raid1 target didn't do this everywhere: this patch fixes it, taking care to subtract ti->begin exactly once for each bio. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: fix block device initialisationJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | | | In alloc_dev(), we register the device with the block layer and then continue to initialize the device. But register_disk() makes the device available to be opened before we have completed initialising it. This patch moves the final bits of the initialization above the disk registration. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: add module ref countingJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | | | | | The reference counting on dm-mod is zero if no mapped devices are open. This is incorrect, and can lead to an oops if the module is unloaded while mapped devices exist. This patch claims a reference to the module whenever a device is created, and drops it again when the device is freed. Devices must be removed before dm-mod is unloaded. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: fix mapped device ref countingJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | | To avoid races, _minor_lock must be held while changing mapped device reference counts. There are a few paths where a mapped_device pointer is returned before a reference is taken. This patch fixes them. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: add DMF_FREEINGJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | | | | There is a chicken and egg problem between the block layer and dm in which the gendisk associated with a mapping keeps a reference-less pointer to the mapped_device. This patch uses a new flag DMF_FREEING to indicate when the mapped_device is no longer valid. This is checked to prevent any attempt to open the device from succeeding while the device is being destroyed. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: change minor_lock to spinlockJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | While removing a device, another another thread might attempt to resurrect it. This patch replaces the _minor_lock mutex with a spinlock and uses atomic_dec_and_lock() to serialize reference counting in dm_put(). [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: move idr_pre_getJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | idr_pre_get() can sleep while allocating memory. The next patch will change _minor_lock into a spinlock, so this patch moves idr_pre_get() outside the lock in preparation. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm: fix idr minor allocationJeff Mahoney2006-06-26
| | | | | | | | | | | | | | | | | | | One part of the system can attempt to use a mapped device before another has finished initialising it or while it is being freed. This patch introduces a place holder value, MINOR_ALLOCED, to mark the minor as allocated but in a state where it can't be used, such as mid-allocation or mid-free. At the end of the initialization, it replaces the place holder with the pointer to the mapped_device, making it available to the rest of the dm subsystem. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] lib: add idr_replaceJeff Mahoney2006-06-26
| | | | | | | | | | | | | This patch adds idr_replace() to replace an existing pointer in a single operation. Device-mapper will use this to update the pointer it stored against a given id. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] dm snapshot: unify chunk_sizeAlasdair G Kergon2006-06-26
| | | | | | | | | | | | | | | | | | | | | | | Persistent snapshots currently store a private copy of the chunk size. Userspace also supplies the chunk size when loading a snapshot. Ensure consistency by only storing the chunk_size in one place instead of two. Currently the two sizes will differ if the chunk size supplied by userspace does not match the chunk size an existing snapshot actually uses. Amongst other problems, this causes an incorrect 'percentage full' to be reported. The patch ensures consistency by only storing the chunk_size in one place, removing it from struct pstore. Some initialisation is delayed until the correct chunk_size is known. If read_header() discovers that the wrong chunk size was supplied, the 'area' buffer (which the header already got read into) is reinitialised to the correct size. [akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled] Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Make sticon support bindingAntonino A. Daplas2006-06-26
| | | | | | | | Do not mark sticon_startup() as __init Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Make promcon support bindingAntonino A. Daplas2006-06-26
| | | | | | | | Do not mark promcon_startup() and promcon_init_unimap() as __init Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Make newport_con support bindingAntonino A. Daplas2006-06-26
| | | | | | | | | - move register ioremap from newport_startup() to newport_console_init() - fonts are freed multiple times, do it only once Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Make mdacon support bindingAntonino A. Daplas2006-06-26
| | | | | | | | Do not mark mdacon_startup __init. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Update documentationAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | Update Documentation/fb/fbcon.txt and Documentatin/console/console.txt to reflect the following changes: 1. sysfs attributes are relocated to /sys/class/vtconsole 2. feature is selectable in Kconfig 3. add sample scripts to fbcon.txt Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Do not create a device file for class device 'fbcon'Antonino A. Daplas2006-06-26
| | | | | | | | | | The class device "fbcon" does not need to be a device file. Do not create one by passing a major and minor number of zero to class_device_create()/destroy(). Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Make VT binding a Kconfig optionAntonino A. Daplas2006-06-26
| | | | | | | | | | To enable this feature, CONFIG_VT_HW_CONSOLE_BINDING must be set to 'y'. This feature will default to 'n' to minimize users accidentally corrupting their virtual terminals. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Add sysfs control to the VT layerAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | | | | | | | | | | Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Add new doc file describing the featureAntonino A. Daplas2006-06-26
| | | | | | | | | | | | This newly added file will: - Describe the characteristics of 2 general types of console drivers - How to use the sysfs to unbind and bind console drivers - Uses for this feature Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: fbcon: Update documentationAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | Update Documentation/fb/fbcon.txt to reflect the following changes: 1. Simple illustration of the binding of the console down to individual framebuffer drivers 2. Usage of userspace tools to help with recovery of text console 3. How to use the attributes in /sys/class/tty/console to unload fbcon and the framebuffer drivers Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Update fbcon to support bindingAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The control for binding/unbinding is moved from fbcon to the console layer. Thus the fbcon sysfs attributes, attach and detach, are also gone. 1. Add a notifier event that tells fbcon if a framebuffer driver has been unregistered. If no registered driver remains, fbcon will unregister itself from the console layer. 2. Replaced calls to give_up_console() with unregister_con_driver(). 3. Still use take_over_console() instead of register_con_driver() to maintain compatibility 4. Respect the parameter first_fb_vc and last_fb_vc instead of using 0 and MAX_NR_CONSOLES - 1. These parameters are settable by the user. 5. When fbcon is completely unbound from the console layer, fbcon will also release (iow, decrement module reference counts to zero) all fbdev drivers. In other words, a bind or unbind request from the console layer will propagate down to the framebuffer drivers. 6. If fbcon is not bound to the console, it will ignore all notifier events (except driver registration and unregistration) and all sysfs requests. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] VT binding: Add binding/unbinding support for the VT consoleAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: update documentationAntonino A. Daplas2006-06-26
| | | | | | | | | | | Update Documentation/fb/fbcon.txt on the following: 1. sysfs attributes are now located in class/graphics/fbcon 2. instructions on how to attach, detach and/or unload fbcon Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: add capability to attach/detach fbconAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | | | | | | | | | Add the ability to detach and attach the framebuffer console to and from the vt layer. This is done by echo'ing any value to sysfs attributes located in class/graphics/fbcon. The two attributes are: attach - bind fbcon to the vt layer detach - unbind fbcon from the vt layer Once fbcon is detached from the vt layer, fbcon can be unloaded if compiled as a module. This feature is quite useful for developers who work on the framebuffer or console subsystem. This is also useful for users who want to go to text mode or graphics mode without having to reboot. Directly unloading the fbcon module is not possible because the vt layer increments the module reference count for all bound consoles. Detaching fbcon decrements the module reference count to zero so unloading becomes possible. Detaching fbcon may interfere with X and/or DRM. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: clean up exit codeAntonino A. Daplas2006-06-26
| | | | | | | | | To detach fbcon, it must also clean up all resources it allocated. This was never done before because fbcon cannot be unloaded. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: sdd sysfs class device entry for fbconAntonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | In order for this feature to work, an interface will be needed. The most appropriate is sysfs. However, the framebuffer console has no sysfs entry yet. This will create a sysfs class device entry for fbcon under /sys/class/graphics. Add a class_device entry 'fbcon' under class 'graphics'. Console-specific attributes which where previously under class/graphics/fb[x] are moved to class/graphics/fbcon. These attributes, 'con_rotate' and 'con_rotate_all', are also renamed to 'rotate' and 'rotate_all' respectively. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: remove calls to pci_disable_device()Antonino A. Daplas2006-06-26
| | | | | | | | | | | | Detaching fbcon allows individual drivers to be unloaded. However several drivers call pci_disable_device() upon exit. This function will disable the BAR's which will kill VGA text mode and/or affect X/DRM. To prevent this, remove calls to pci_disable_device() from several drivers. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Detaching fbcon: fix give_up_console()Antonino A. Daplas2006-06-26
| | | | | | | | | | | | | | | | | To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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