linux-toradex.git/fs/drop_caches.c, branch v3.0.29

vmscan: change shrinker API by passing shrink_control struct

2011-05-25T15:39:26+00:00

Change each shrinker's API by consolidating the existing parameters into
shrink_control struct.  This will simplify any further features added w/o
touching each file of shrinker.

[akpm@linux-foundation.org: fix build]
[akpm@linux-foundation.org: fix warning]
[kosaki.motohiro@jp.fujitsu.com: fix up new shrinker API]
[akpm@linux-foundation.org: fix xfs warning]
[akpm@linux-foundation.org: update gfs2]
Signed-off-by: Ying Han 
Cc: KOSAKI Motohiro 
Cc: Minchan Kim 
Acked-by: Pavel Emelyanov 
Cc: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Acked-by: Rik van Riel 
Cc: Johannes Weiner 
Cc: Hugh Dickins 
Cc: Dave Hansen 
Cc: Steven Whitehouse 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vmscan: change shrink_slab() interfaces by passing shrink_control

2011-05-25T15:39:25+00:00

Consolidate the existing parameters to shrink_slab() into a new
shrink_control struct.  This is needed later to pass the same struct to
shrinkers.

Signed-off-by: Ying Han 
Cc: KOSAKI Motohiro 
Cc: Minchan Kim 
Acked-by: Pavel Emelyanov 
Cc: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Acked-by: Rik van Riel 
Cc: Johannes Weiner 
Cc: Hugh Dickins 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs: move i_sb_list out from under inode_lock

2011-03-25T01:16:32+00:00

Protect the per-sb inode list with a new global lock
inode_sb_list_lock and use it to protect the list manipulations and
traversals. This lock replaces the inode_lock as the inodes on the
list can be validity checked while holding the inode->i_lock and
hence the inode_lock is no longer needed to protect the list.

Signed-off-by: Dave Chinner 
Signed-off-by: Al Viro

fs: protect inode->i_state with inode->i_lock

2011-03-25T01:16:31+00:00

Protect inode state transitions and validity checks with the
inode->i_lock. This enables us to make inode state transitions
independently of the inode_lock and is the first step to peeling
away the inode_lock from the code.

This requires that __iget() is done atomically with i_state checks
during list traversals so that we don't race with another thread
marking the inode I_FREEING between the state check and grabbing the
reference.

Also remove the unlock_new_inode() memory barrier optimisation
required to avoid taking the inode_lock when clearing I_NEW.
Simplify the code by simply taking the inode->i_lock around the
state change and wakeup. Because the wakeup is no longer tricky,
remove the wake_up_inode() function and open code the wakeup where
necessary.

Signed-off-by: Dave Chinner 
Signed-off-by: Al Viro

sysctl: add some missing input constraint checks

2011-03-24T02:46:51+00:00

Add boundaries of allowed input ranges for: dirty_expire_centisecs,
drop_caches, overcommit_memory, page-cluster and panic_on_oom.

Signed-off-by: Petr Holasek 
Acked-by: Dave Young 
Cc: David Rientjes 
Cc: Wu Fengguang 
Cc: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

simplify checks for I_CLEAR/I_FREEING

2010-08-09T20:47:44+00:00

add I_CLEAR instead of replacing I_FREEING with it.  I_CLEAR is
equivalent to I_FREEING for almost all code looking at either;
it's there to keep track of having called clear_inode() exactly
once per inode lifetime, at some point after having set I_FREEING.
I_CLEAR and I_FREEING never get set at the same time with the
current code, so we can switch to setting i_flags to I_FREEING | I_CLEAR
instead of I_CLEAR without loss of information.  As the result of
such change, checks become simpler and the amount of code that needs
to know about I_CLEAR shrinks a lot.

Signed-off-by: Al Viro

new helper: iterate_supers()

2010-05-21T22:31:16+00:00

... and switch the simple "loop over superblocks and do something"
loops to it.

Signed-off-by: Al Viro

Bury __put_super_and_need_restart()

2010-05-21T22:31:16+00:00

Signed-off-by: Al Viro

Convert simple loops over superblocks to list_for_each_entry_safe

2010-05-21T22:31:15+00:00

Signed-off-by: Al Viro

Leave superblocks on s_list until the end

2010-05-21T22:31:14+00:00

We used to remove from s_list and s_instances at the same
time.  So let's *not* do the former and skip superblocks
that have empty s_instances in the loops over s_list.

The next step, of course, will be to get rid of rescan logics
in those loops.

Signed-off-by: Al Viro