linux.git/fs/sysfs/sysfs.h, branch v2.6.30

sysfs: don't block indefinitely for unmapped files.

2009-03-24T23:38:26+00:00

Modify sysfs bin files so that we can remove the bin file while they are
still mapped.  When the kobject is removed we unmap the bin file and
arrange for future accesses to the mapping to receive SIGBUS.

Implementing this prevents a nasty DOS when pci devices are hot plugged
and unplugged.  Where if any of their resources were mmaped the kernel
could not free up their pci resources or release their pci data
structures.

[akpm@linux-foundation.org: remove unused var]
Signed-off-by: Eric W. Biederman 
Cc: Jesse Barnes 
Acked-by: Tejun Heo 
Cc: Kay Sievers 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

sysfs: reference sysfs_dirent from sysfs inodes

2009-03-24T23:38:25+00:00

The sysfs_dirent serves as both an inode and a directory entry
for sysfs.  To prevent the sysfs inode numbers from being freed
prematurely hold a reference to sysfs_dirent from the sysfs inode.

[akpm@linux-foundation.org: add comment]
Signed-off-by: Eric W. Biederman 
Cc: Tejun Heo 
Cc: Al Viro 
Cc: Cornelia Huck 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

sysfs: Support sysfs_notify from atomic context with new sysfs_notify_dirent

2008-10-16T16:24:47+00:00

Support sysfs_notify from atomic context with new sysfs_notify_dirent

sysfs_notify currently takes sysfs_mutex.
This means that it cannot be called in atomic context.
sysfs_mutex  is sometimes held over a malloc (sysfs_rename_dir)
so it can block on low memory.

In md I want to be able to notify on a sysfs attribute from
atomic context, and I don't want to block on low memory because I
could be in the writeout path for freeing memory.

So:
 - export the "sysfs_dirent" structure along with sysfs_get, sysfs_put
   and sysfs_get_dirent so I can get the sysfs_dirent that I want to
   notify on and hold it in an md structure.
 - split sysfs_notify_dirent out of sysfs_notify so the sysfs_dirent
   can be notified on with no blocking (just a spinlock).

Signed-off-by: Neil Brown 
Acked-by: Tejun Heo 
Signed-off-by: Greg Kroah-Hartman

driver core: Suppress sysfs warnings for device_rename().

2008-07-22T04:55:01+00:00

driver core: Suppress sysfs warnings for device_rename().

Renaming network devices to an already existing name is not
something we want sysfs to print a scary warning for, since the
callers can deal with this correctly. So let's introduce
sysfs_create_link_nowarn() which gets rid of the common warning.

Signed-off-by: Cornelia Huck 
Signed-off-by: Greg Kroah-Hartman

[SCSI] sysfs: make group is_valid return a mode_t

2008-04-22T20:16:31+00:00

We have a problem in scsi_transport_spi in that we need to customise
not only the visibility of the attributes, but also their mode.  Fix
this by making the is_visible() callback return a mode, with 0
indicating is not visible.

Also add a sysfs_update_group() API to allow us to change either the
visibility or mode of the files at any time on the fly.

Acked-by: Kay Sievers 
Signed-off-by: James Bottomley

sysfs: make sysfs_{get,put}_active() static

2007-10-31T04:52:33+00:00

sysfs_{get,put}_active() can now become static.

Signed-off-by: Adrian Bunk 
Signed-off-by: Greg Kroah-Hartman

mm: bdi init hooks

2007-10-17T15:42:45+00:00

provide BDI constructor/destructor hooks

[akpm@linux-foundation.org: compile fix]
Signed-off-by: Peter Zijlstra 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sysfs: add copyrights

2007-10-12T21:51:12+00:00

Sysfs has gone through considerable amount of reimplementation.  Add
copyrights.  Any objections?  :-)

Signed-off-by: Tejun Heo 
Signed-off-by: Greg Kroah-Hartman

sysfs: move sysfs file poll implementation to sysfs_open_dirent

2007-10-12T21:51:11+00:00

Sysfs file poll implementation is scattered over sysfs and kobject.
Event numbering is done in sysfs_dirent but wait itself is done on
kobject.  This not only unecessarily bloats both kobject and
sysfs_dirent but is also buggy - if a sysfs_dirent is removed while
there still are pollers, the associaton betwen the kobject and
sysfs_dirent breaks and kobject may be freed with the pollers still
sleeping on it.

This patch moves whole poll implementation into sysfs_open_dirent.
Each time a sysfs_open_dirent is created, event number restarts from 1
and pollers sleep on sysfs_open_dirent.  As event sequence number is
meaningless without any open file and pollers should have open file
and thus sysfs_open_dirent, this ephemeral event counting works and is
a saner implementation.

This patch fixes the dnagling sleepers bug and reduces the sizes of
kobject and sysfs_dirent by one pointer.

Signed-off-by: Tejun Heo 
Acked-by: Cornelia Huck 
Signed-off-by: Greg Kroah-Hartman

sysfs: implement sysfs_open_dirent

2007-10-12T21:51:11+00:00

Implement sysfs_open_dirent which represents an open file (attribute)
sysfs_dirent.  A file sysfs_dirent with one or more open files have
one sysfs_dirent and all sysfs_buffers (one for each open instance)
are linked to it.

sysfs_open_dirent doesn't actually do anything yet but will be used to
off-load things which are specific for open file sysfs_dirent from it.

Signed-off-by: Tejun Heo 
Acked-by: Cornelia Huck 
Signed-off-by: Greg Kroah-Hartman