linux-toradex.git/fs/logfs/inode.c, branch v3.2.73

filesystems: add missing nlink wrappers

2011-11-02T11:53:43+00:00

Replace direct i_nlink updates with the respective updater function
(inc_nlink, drop_nlink, clear_nlink, inode_dec_link_count).

Signed-off-by: Miklos Szeredi

logfs: remove unnecessary nlink setting

2011-11-02T11:53:42+00:00

alloc_inode() initializes i_nlink to 1.  Remove unnecessary
re-initialization.

Signed-off-by: Miklos Szeredi 
CC: Joern Engel 
CC: Prasad Joshi 
Signed-off-by: Christoph Hellwig

fs: remove inode_lock from iput_final and prune_icache

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

Now that inode state changes are protected by the inode->i_lock and
the inode LRU manipulations by the inode_lru_lock, we can remove the
inode_lock from prune_icache and the initial part of iput_final().

instead of using the inode_lock to protect the inode during
iput_final, use the inode->i_lock instead. This protects the inode
against new references being taken while we change the inode state
to I_FREEING, as well as preventing prune_icache from grabbing the
inode while we are manipulating it. Hence we no longer need the
inode_lock in iput_final prior to setting I_FREEING on the inode.

For prune_icache, we no longer need the inode_lock to protect the
LRU list, and the inodes themselves are protected against freeing
races by the inode->i_lock. Hence we can lift the inode_lock from
prune_icache as well.

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

fs: icache RCU free inodes

2011-01-07T06:50:26+00:00

RCU free the struct inode. This will allow:

- Subsequent store-free path walking patch. The inode must be consulted for
  permissions when walking, so an RCU inode reference is a must.
- sb_inode_list_lock to be moved inside i_lock because sb list walkers who want
  to take i_lock no longer need to take sb_inode_list_lock to walk the list in
  the first place. This will simplify and optimize locking.
- Could remove some nested trylock loops in dcache code
- Could potentially simplify things a bit in VM land. Do not need to take the
  page lock to follow page->mapping.

The downsides of this is the performance cost of using RCU. In a simple
creat/unlink microbenchmark, performance drops by about 10% due to inability to
reuse cache-hot slab objects. As iterations increase and RCU freeing starts
kicking over, this increases to about 20%.

In cases where inode lifetimes are longer (ie. many inodes may be allocated
during the average life span of a single inode), a lot of this cache reuse is
not applicable, so the regression caused by this patch is smaller.

The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU,
however this adds some complexity to list walking and store-free path walking,
so I prefer to implement this at a later date, if it is shown to be a win in
real situations. I haven't found a regression in any non-micro benchmark so I
doubt it will be a problem.

Signed-off-by: Nick Piggin

Make ->drop_inode() just return whether inode needs to be dropped

2010-08-09T20:48:35+00:00

... and let iput_final() do the actual eviction or retention

Signed-off-by: Al Viro

convert logfs to ->evict_inode()

2010-08-09T20:48:28+00:00

Signed-off-by: Al Viro

logfs: get rid of magical inodes

2010-08-09T20:48:26+00:00

ordering problems at ->kill_sb() time are solved by doing iput()
of these suckers in ->put_super()

Signed-off-by: Al Viro

logfs: replace inode uid,gid,mode initialization with helper function

2010-05-21T22:31:27+00:00

Signed-off-by: Al Viro

logfs: fix sync

2010-05-05T20:33:36+00:00

Rather self-explanatory.

Signed-off-by: Joern Engel

logfs: initialize li->li_refcount

2010-05-04T20:17:08+00:00

li_refcount was not re-initialized in function logfs_init_inode(), small
patch that will fix the problem

Signed-off-by: Prasad Joshi 
Signed-off-by: Joern Engel