user/sven/linux.git/include/linux/blockgroup_lock.h, branch v4.12

blockgroup_lock.h: simplify definition of NR_BG_LOCKS

2016-09-15T22:29:06Z

We can use ilog2() to more easily produce the desired NR_BG_LOCKS. This works because ilog2() is evaluated at compile-time when its argument is a compile-time constant. I did not change the chosen NR_BG_LOCKS values. Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o Reviewed-by: Andreas Dilger

blockgroup_lock.h: remove debris from bgl_lock_ptr() conversion

2016-09-15T22:25:07Z

An obsolete comment and extra parentheses were left over from when the sb_bgl_lock() macro was replaced with the bgl_lock_ptr() function. Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o Reviewed-by: Andreas Dilger

fs: introduce bgl_lock_ptr()

2009-01-04T21:33:20Z

As suggested by Andreas Dilger, introduce a bgl_lock_ptr() helper in and add separate sb_bgl_lock() helpers to filesystem specific header files to break the hidden dependency to struct ext[234]_sb_info. Also, while at it, convert the macros to static inlines to try make up for all the times I broke Andrew Morton's tree. Acked-by: Andreas Dilger Signed-off-by: Pekka Enberg Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Don't include linux/config.h from anywhere else in include/

2006-04-26T11:56:16Z

Signed-off-by: David Woodhouse

[PATCH] #ifndef guard percpu_counter.h and blockgroup_lock.h

2004-07-14T02:26:31Z

Insert header guards to allow possible multiple inclusion for include/linux/percpu_counter.h and include/linux/blockgroup_lock.h Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] blockgroup_lock: hashed spinlocks for ext2 and ext3

2003-04-12T20:00:09Z

ext2 and ext3 per-blockgroup metadata needs locking. An fs-wide lock is expensive, and a per-blockgroup lock consumes too much storage (up to 32768 blockgroups per filesystem). We need something in-between. blockgroup_locks are very simple hashed spinlocks which provide this compromise. The size of the lock is scaled by NR_CPUS to implement an additional speed/space tradeoff. These locks are actually fairly generic. However I presented it as something which is specific to ext2 and ext3 so that people wouldn't go using them all over the place. They consume a lot of storage.