linux/fs/configfs, branch v2.6.39-rc2

configfs: change depends -> select SYSFS

2011-01-16T21:22:29Z

This patch changes configfs to select SYSFS to fix the following: warning: (TARGET_CORE && GFS2_FS) selects CONFIGFS_FS which has unmet direct dependencies (SYSFS) Reported-by: Randy Dunlap Signed-off-by: Nicholas A. Bellinger Acked-by: Joel Becker

switch configfs

2011-01-13T01:03:12Z

Signed-off-by: Al Viro

fs: dcache reduce branches in lookup path

2011-01-07T06:50:28Z

Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin

fs: dcache rationalise dget variants

2011-01-07T06:50:24Z

dget_locked was a shortcut to avoid the lazy lru manipulation when we already held dcache_lock (lru manipulation was relatively cheap at that point). However, how that the lru lock is an innermost one, we never hold it at any caller, so the lock cost can now be avoided. We already have well working lazy dcache LRU, so it should be fine to defer LRU manipulations to scan time. Signed-off-by: Nick Piggin

fs: dcache remove dcache_lock

2011-01-07T06:50:23Z

dcache_lock no longer protects anything. remove it. Signed-off-by: Nick Piggin

fs: dcache scale d_unhashed

2011-01-07T06:50:21Z

Protect d_unhashed(dentry) condition with d_lock. This means keeping DCACHE_UNHASHED bit in synch with hash manipulations. Signed-off-by: Nick Piggin

fs: dcache scale dentry refcount

2011-01-07T06:50:21Z

Make d_count non-atomic and protect it with d_lock. This allows us to ensure a 0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when we start protecting many other dentry members with d_lock. Signed-off-by: Nick Piggin

fs: change d_delete semantics

2011-01-07T06:50:18Z

Change d_delete from a dentry deletion notification to a dentry caching advise, more like ->drop_inode. Require it to be constant and idempotent, and not take d_lock. This is how all existing filesystems use the callback anyway. This makes fine grained dentry locking of dput and dentry lru scanning much simpler. Signed-off-by: Nick Piggin

config fs: avoid switching ->d_op on live dentry

2011-01-07T06:50:17Z

Switching d_op on a live dentry is racy in general, so avoid it. In this case it is a negative dentry, which is safer, but there are still concurrent ops which may be called on d_op in that case (eg. d_revalidate). So in general a filesystem may not do this. Fix configfs so as not to do this. Signed-off-by: Nick Piggin

convert get_sb_single() users

2010-10-29T08:16:28Z

Signed-off-by: Al Viro