* 'virtio' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio_blk: remove BKL leftovers
  virtio: console: Disable lseek(2) for port file operations
  virtio: console: Send SIGIO in case of port unplug
  virtio: console: Send SIGIO on new data arrival on ports
  virtio: console: Send SIGIO to processes that request it for host events
  virtio: console: Reference counting portdev structs is not needed
  virtio: console: Add reference counting for port struct
  virtio: console: Use cdev_alloc() instead of cdev_init()
  virtio: console: Add a find_port_by_devt() function
  virtio: console: Add a list of portdevs that are active
  virtio: console: open: Use a common path for error handling
  virtio: console: remove_port() should return void
  virtio: console: Make write() return -ENODEV on hot-unplug
  virtio: console: Make read() return -ENODEV on hot-unplug
  virtio: console: Unblock poll on port hot-unplug
  virtio: console: Un-block reads on chardev close
  virtio: console: Check if portdev is valid in send_control_msg()
  virtio: console: Remove control vq data only if using multiport support
  virtio: console: Reset vdev before removing device

* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (22 commits)
  GFS2: fixed typo
  GFS2: Fix type mapping for demote_rq interface
  GFS2 fatal: filesystem consistency error on rename
  GFS2: Improve journal allocation via sysfs
  GFS2: Add "norecovery" mount option as a synonym for "spectator"
  GFS2: Fix spectator umount issue
  GFS2: Fix compiler warning from previous patch
  GFS2: reserve more blocks for transactions
  GFS2: Fix journal check for spectator mounts
  GFS2: Remove upgrade mount option
  GFS2: Remove localcaching mount option
  GFS2: Remove ignore_local_fs mount argument
  GFS2: Make . and .. qstrs constant
  GFS2: Use new workqueue scheme
  GFS2: Update handling of DLM return codes to match reality
  GFS2: Don't enforce min hold time when two demotes occur in rapid succession
  GFS2: Fix whitespace in previous patch
  GFS2: fallocate support
  GFS2: Add a bug trap in allocation code
  GFS2: No longer experimental
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (22 commits)
  ceph: do not carry i_lock for readdir from dcache
  fs/ceph/xattr.c: Use kmemdup
  rbd: passing wrong variable to bvec_kunmap_irq()
  rbd: null vs ERR_PTR
  ceph: fix num_pages_free accounting in pagelist
  ceph: add CEPH_MDS_OP_SETDIRLAYOUT and associated ioctl.
  ceph: don't crash when passed bad mount options
  ceph: fix debugfs warnings
  block: rbd: removing unnecessary test
  block: rbd: fixed may leaks
  ceph: switch from BKL to lock_flocks()
  ceph: preallocate flock state without locks held
  ceph: add pagelist_reserve, pagelist_truncate, pagelist_set_cursor
  ceph: use mapping->nrpages to determine if mapping is empty
  ceph: only invalidate on check_caps if we actually have pages
  ceph: do not hide .snap in root directory
  rbd: introduce rados block device (rbd), based on libceph
  ceph: factor out libceph from Ceph file system
  ceph-rbd: osdc support for osd call and rollback operations
  ceph: messenger and osdc changes for rbd
  ...

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus: (29 commits)
  hfsplus: fix getxattr return value
  hfsplus: remove the unused hfsplus_kmap/hfsplus_kunmap helpers
  hfsplus: create correct initial catalog entries for device files
  hfsplus: remove superflous rootflags field in hfsplus_inode_info
  hfsplus: fix link corruption
  hfsplus: validate btree flags
  hfsplus: handle more on-disk corruptions without oopsing
  hfsplus: hfs_bnode_find() can fail, resulting in hfs_bnode_split() breakage
  hfsplus: fix oops on mount with corrupted btree extent records
  hfsplus: fix rename over directories
  hfsplus: convert tree_lock to mutex
  hfsplus: add missing extent locking in hfsplus_write_inode
  hfsplus: protect readdir against removals from open_dir_list
  hfsplus: use atomic bitops for the superblock flags
  hfsplus: add per-superblock lock for volume header updates
  hfsplus: remove the rsrc_inodes list
  hfsplus: do not cache and write next_alloc
  hfsplus: fix error handling in hfsplus_symlink
  hfsplus: merge mknod/mkdir/creat
  hfsplus: clean up hfsplus_write_inode
  ...

Remove the BKL usage added in "block: push down BKL into .locked_ioctl".
Virtio-blk doesn't use the BKL for anything, and doesn't implement any
ioctl command by itself, but only uses the generic scsi_cmd_ioctl
which is fine without the BKL.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The ports are char devices; do not have seeking capabilities.  Calling
nonseekable_open() from the fops_open() call and setting the llseek fops
pointer to no_llseek ensures an lseek() call from userspace returns
-ESPIPE.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

If a port has registered for SIGIO signals, let the application
know that the port is getting unplugged.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Send a SIGIO signal when new data arrives on a port. This is sent only
when the process has requested for the signal to be sent using fcntl().
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

A process can request for SIGIO on host connect / disconnect events
using the O_ASYNC file flag using fcntl().

If that's requested, and if the guest-side connection for the port is
open, any host-side open/close events for that port will raise a SIGIO.
The process can then use poll() within the signal handler to find out
which port triggered the signal.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Explain in a comment why there's no need to reference-count the portdev
struct: when a device is yanked out, we can't do anything more with it
anyway so just give up doing anything more with the data or the vqs and
exit cleanly.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

When a port got hot-unplugged, when a port was open, any file operation
after the unplugging resulted in a crash. This is fixed by ref-counting
the port structure, and releasing it only when the file is closed.

This splits the unplug operation in two parts: first marks the port
as unavailable, removes all the buffers in the vqs and removes the port
from the per-device list of ports. The second stage, invoked when all
references drop to zero, releases the chardev and frees all other memory.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This moves to using cdev on the heap instead of it being embedded in the
ports struct. This helps individual refcounting and will allow us to
properly remove cdev structs after hot-unplugs and close operations.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

To convert to using cdev as a pointer to avoid kref troubles, we have to
use a different method to get to a port from an inode than the current
container_of method.

Add find_port_by_devt() that looks up all portdevs and ports with those
portdevs to find the right port.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The virtio_console.c driver is capable of handling multiple devices at a
time. Maintain a list of devices for future traversal.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Just re-arrange code for future patches.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

When a port is removed, we have to assume the port is gone. So a
success/failure return value doesn't make sense.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

When a port is hot-unplugged while an app was blocked on a write() call,
the call was unblocked but would not get an error returned.

Return -ENODEV to ensure the app knows the port has gone away.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

When a port is hot-unplugged while an app was blocked on a read() call,
the call was unblocked but would not get an error returned.

Return -ENODEV to ensure the app knows the port has gone away.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

When a port is hot-unplugged while an app is blocked on poll(), unblock
the poll() and return.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

If a chardev is closed, any blocked read / poll calls should just return
and not attempt to use other state.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

A portdev may have been hot-unplugged while a port was open()ed.  Skip
sending control messages when the portdev isn't valid.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

If a portdev isn't using multiport support, it won't have any control vq
data to remove.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The virtqueues should be disabled before attempting to remove the
device.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

We were taking dcache_lock inside of i_lock, which introduces a dependency
not found elsewhere in the kernel, complicationg the vfs locking
scalability work.  Since we don't actually need it here anyway, remove
it.

We only need i_lock to test for the I_COMPLETE flag, so be careful to do
so without dcache_lock held.
Signed-off-by: Sage Weil <sage@newdream.net>

Convert a sequence of kmalloc and memcpy to use kmemdup.

The semantic patch that performs this transformation is:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,flag,len;
expression arg,e1,e2;
statement S;
@@

  a =
-  \(kmalloc\|kzalloc\)(len,flag)
+  kmemdup(arg,len,flag)
  <... when != a
  if (a == NULL || ...) S
  ...>
- memcpy(a,arg,len+1);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Sage Weil <sage@newdream.net>

We should be passing "buf" here insead of "bv".  This is tricky because
it's not the same as kmap() and kunmap().  GCC does warn about it if you
compile on i386 with CONFIG_HIGHMEM.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>

ceph_alloc_page_vector() returns ERR_PTR(-ENOMEM) on errors.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>

Decrement the free page counter when removing a page from the free_list.
Signed-off-by: Sage Weil <sage@newdream.net>

Signed-off-by: Sage Weil <sage@newdream.net>

This only happened when parse_extra_token was not passed
to ceph_parse_option() (hence, only happened in rbd).
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

Include "super.h" outside of CONFIG_DEBUG_FS to eliminate a compiler warning:

fs/ceph/debugfs.c:266: warning: 'struct ceph_fs_client' declared inside parameter list
fs/ceph/debugfs.c:266: warning: its scope is only this definition or declaration, which is probably not what you want
fs/ceph/debugfs.c:271: warning: 'struct ceph_fs_client' declared inside parameter list
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

rbd_get_segment() can't return a negative value, we don't need to check
the return output.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

rbd_client_create() doesn't free rbdc, this leads to many leaks.

seg_len in rbd_do_op() is unsigned, so (seg_len < 0) makes no sense.
Also if fixed check fails then seg_name is leaked.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>

Switch from using the BKL explicitly to the new lock_flocks() interface.
Eventually this will turn into a spinlock.
Signed-off-by: Sage Weil <sage@newdream.net>

When the lock_kernel() turns into lock_flocks() and a spinlock, we won't
be able to do allocations with the lock held.  Preallocate space without
the lock, and retry if the lock state changes out from underneath us.
Signed-off-by: Greg Farnum <gregf@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

These facilitate preallocation of pages so that we can encode into the pagelist
in an atomic context.
Signed-off-by: Greg Farnum <gregf@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

This is simpler and faster.
Signed-off-by: Sage Weil <sage@newdream.net>

The i_rdcache_gen value only implies we MAY have cached pages; actually
check the mapping to see if it's worth bothering with an invalidate.
Signed-off-by: Sage Weil <sage@newdream.net>

Snaps in the root directory are now supported by the MDS, and harmless on
older versions.
Signed-off-by: Sage Weil <sage@newdream.net>

The rados block device (rbd), based on osdblk, creates a block device
that is backed by objects stored in the Ceph distributed object storage
cluster.  Each device consists of a single metadata object and data
striped over many data objects.

The rbd driver supports read-only snapshots.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>