kernel.git/drivers/md/dm.c, branch linux-2.6.18.y

[PATCH] devfs: Last little devfs cleanups throughout the kernel tree.

2006-06-26T19:25:09Z

Just removes a few unused #defines and fixes some comments due to devfs now being gone. Signed-off-by: Greg Kroah-Hartman

[PATCH] dm: improve error message consistency

2006-06-26T16:58:36Z

Tidy device-mapper error messages to include context information automatically. Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: prevent removal if open

2006-06-26T16:58:36Z

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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: add exports

2006-06-26T16:58:36Z

Move definitions of core device-mapper functions for manipulating mapped devices and their tables to 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: consolidate creation functions

2006-06-26T16:58:36Z

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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: fix block device initialisation

2006-06-26T16:58:35Z

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 Signed-off-by: Alasdair G Kergon Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: add module ref counting

2006-06-26T16:58:35Z

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 Signed-off-by: Alasdair G Kergon Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: add DMF_FREEING

2006-06-26T16:58:34Z

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 Signed-off-by: Alasdair G Kergon Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: change minor_lock to spinlock

2006-06-26T16:58:34Z

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 Signed-off-by: Alasdair G Kergon Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] dm: move idr_pre_get

2006-06-26T16:58:34Z

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 Signed-off-by: Alasdair G Kergon Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds