linux.git/fs/block_dev.c, branch v3.4-rc4

magic.h: move some FS magic numbers into magic.h

2012-03-23T23:58:31+00:00

- Move open-coded filesystem magic numbers into magic.h

- Rearrange magic.h so that the filesystem-related constants are grouped
  together.

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

Merge branch 'stable/cleancache.v13' into linux-next

2012-03-19T16:12:19+00:00

* stable/cleancache.v13:
  mm: cleancache: Use __read_mostly as appropiate.
  mm: cleancache: report statistics via debugfs instead of sysfs.
  mm: zcache/tmem/cleancache: s/flush/invalidate/
  mm: cleancache: s/flush/invalidate/

block: Fix NULL pointer dereference in sd_revalidate_disk

2012-03-02T09:38:33+00:00

Since 2.6.39 (1196f8b), when a driver returns -ENOMEDIUM for open(),
__blkdev_get() calls rescan_partitions() to remove
in-kernel partition structures and raise KOBJ_CHANGE uevent.

However it ends up calling driver's revalidate_disk without open
and could cause oops.

In the case of SCSI:

  process A                  process B
  ----------------------------------------------
  sys_open
    __blkdev_get
      sd_open
        returns -ENOMEDIUM
                             scsi_remove_device
                               
      rescan_partitions
        sd_revalidate_disk
          
Oopses are reported here:
http://marc.info/?l=linux-scsi&m=132388619710052

This patch separates the partition invalidation from rescan_partitions()
and use it for -ENOMEDIUM case.

Reported-by: Huajun Li 
Signed-off-by: Jun'ichi Nomura 
Acked-by: Tejun Heo 
Cc: stable@kernel.org
Signed-off-by: Jens Axboe

mm: cleancache: s/flush/invalidate/

2012-01-23T21:06:24+00:00

Per akpm suggestions alter the use of the term flush to be
invalidate. The next patch will do this across all MM.

This change is completely cosmetic.

[v9: akpm@linux-foundation.org: change "flush" to "invalidate", part 3]

Signed-off-by: Dan Magenheimer 
Cc: Kamezawa Hiroyuki 
Cc: Jan Beulich 
Reviewed-by: Seth Jennings 
Cc: Jeremy Fitzhardinge 
Cc: Hugh Dickins 
Cc: Johannes Weiner 
Cc: Nitin Gupta 
Cc: Matthew Wilcox 
Cc: Chris Mason 
Cc: Rik Riel 
Cc: Andrew Morton 
[v10: Fixed  fs: move code out of buffer.c conflict change]
Signed-off-by: Konrad Rzeszutek Wilk

vfs: cache request_queue in struct block_device

2012-01-13T04:13:12+00:00

This makes it possible to get from the inode to the request_queue with one
less cache miss.  Used in followon optimization.

The livetime of the pointer is the same as the gendisk.

This assumes that the queue will always stay the same in the gendisk while
it's visible to block_devices.  I think that's safe correct?

Signed-off-by: Andi Kleen 
Acked-by: Jeff Moyer 
Cc: Jens Axboe 
Cc: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block_dev: Suppress bdev_cache_init() kmemleak warninig

2012-01-10T18:08:55+00:00

Kmemleak reports the following warning in bdev_cache_init()
[    0.003738] kmemleak: Object 0xffff880153035200 (size 256):
[    0.003823] kmemleak:   comm "swapper/0", pid 0, jiffies 4294667299
[    0.003909] kmemleak:   min_count = 1
[    0.003988] kmemleak:   count = 0
[    0.004066] kmemleak:   flags = 0x1
[    0.004144] kmemleak:   checksum = 0
[    0.004224] kmemleak:   backtrace:
[    0.004303]      [] kmemleak_alloc+0x21/0x3e
[    0.004446]      [] kmem_cache_alloc+0xca/0x1dc
[    0.004592]      [] alloc_vfsmnt+0x1f/0x198
[    0.004736]      [] vfs_kern_mount+0x36/0xd2
[    0.004879]      [] kern_mount_data+0x18/0x32
[    0.005025]      [] bdev_cache_init+0x51/0x81
[    0.005169]      [] vfs_caches_init+0x101/0x10d
[    0.005313]      [] start_kernel+0x344/0x383
[    0.005456]      [] x86_64_start_reservations+0xae/0xb2
[    0.005602]      [] x86_64_start_kernel+0x102/0x111
[    0.005747]      [] 0xffffffffffffffff
[    0.008653] kmemleak: Trying to color unknown object at 0xffff880153035220 as Grey
[    0.008754] Pid: 0, comm: swapper/0 Not tainted 3.3.0-rc0-dbg-04200-g8180888-dirty #888
[    0.008856] Call Trace:
[    0.008934]  [] ? find_and_get_object+0x44/0x118
[    0.009023]  [] paint_ptr+0x57/0x8f
[    0.009109]  [] kmemleak_not_leak+0x23/0x42
[    0.009195]  [] bdev_cache_init+0x72/0x81
[    0.009282]  [] vfs_caches_init+0x101/0x10d
[    0.009368]  [] start_kernel+0x344/0x383
[    0.009466]  [] x86_64_start_reservations+0xae/0xb2
[    0.009555]  [] ? early_idt_handlers+0x140/0x140
[    0.009643]  [] x86_64_start_kernel+0x102/0x111

due to attempt to mark pointer to `struct vfsmount' as a gray object, which
is embedded into `struct mount' returned from alloc_vfsmnt().

Make `bd_mnt' static, avoiding need to tell kmemleak to mark it gray, as
suggested by Al Viro.

Signed-off-by: Sergey Senozhatsky 
Signed-off-by: Al Viro

fs: move code out of buffer.c

2012-01-04T03:54:07+00:00

Move invalidate_bdev, block_sync_page into fs/block_dev.c.  Export
kill_bdev as well, so brd doesn't have to open code it.  Reduce
buffer_head.h requirement accordingly.

Removed a rather large comment from invalidate_bdev, as it looked a bit
obsolete to bother moving.  The small comment replacing it says enough.

Signed-off-by: Nick Piggin 
Cc: Al Viro 
Cc: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Al Viro

vfs: fix the stupidity with i_dentry in inode destructors

2012-01-04T03:52:40+00:00

Seeing that just about every destructor got that INIT_LIST_HEAD() copied into
it, there is no point whatsoever keeping this INIT_LIST_HEAD in inode_init_once();
the cost of taking it into inode_init_always() will be negligible for pipes
and sockets and negative for everything else.  Not to mention the removal of
boilerplate code from ->destroy_inode() instances...

Signed-off-by: Al Viro

trim fs/internal.h

2012-01-04T03:52:35+00:00

some stuff in there can actually become static; some belongs to pnode.h
as it's a private interface between namespace.c and pnode.c...

Signed-off-by: Al Viro

Merge branch 'for-3.2/drivers' of git://git.kernel.dk/linux-block

2011-11-05T00:22:14+00:00

* 'for-3.2/drivers' of git://git.kernel.dk/linux-block: (30 commits)
  virtio-blk: use ida to allocate disk index
  hpsa: add small delay when using PCI Power Management to reset for kump
  cciss: add small delay when using PCI Power Management to reset for kump
  xen/blkback: Fix two races in the handling of barrier requests.
  xen/blkback: Check for proper operation.
  xen/blkback: Fix the inhibition to map pages when discarding sector ranges.
  xen/blkback: Report VBD_WSECT (wr_sect) properly.
  xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests.
  xen-blkfront: plug device number leak in xlblk_init() error path
  xen-blkfront: If no barrier or flush is supported, use invalid operation.
  xen-blkback: use kzalloc() in favor of kmalloc()+memset()
  xen-blkback: fixed indentation and comments
  xen-blkfront: fix a deadlock while handling discard response
  xen-blkfront: Handle discard requests.
  xen-blkback: Implement discard requests ('feature-discard')
  xen-blkfront: add BLKIF_OP_DISCARD and discard request struct
  drivers/block/loop.c: remove unnecessary bdev argument from loop_clr_fd()
  drivers/block/loop.c: emit uevent on auto release
  drivers/block/cpqarray.c: use pci_dev->revision
  loop: always allow userspace partitions and optionally support automatic scanning
  ...

Fic up trivial header file includsion conflict in drivers/block/loop.c