linux.git/fs/f2fs/node.c, branch v3.15

f2fs: use list_for_each_entry{_safe} for simplyfying code

2014-04-02T00:56:27+00:00

This patch use list_for_each_entry{_safe} instead of list_for_each{_safe} for
simplfying code.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: avoid free slab cache under spinlock

2014-04-02T00:56:12+00:00

Move kmem_cache_free out of spinlock protection region for better performance.

Change log from v1:
 o remove spinlock protection for kmem_cache_free in destroy_node_manager
suggested by Jaegeuk Kim.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: return -EIO when node id is not matched

2014-04-01T08:38:26+00:00

During the cleaing of node segments, F2FS can get errored node blocks due to
data race between node page lock and its valid bitmap operations.
In that case, it needs to return an error to skip such the obsolete block copy.

Signed-off-by: Jaegeuk Kim

f2fs: skip unnecessary node writes during fsync

2014-03-20T13:10:11+00:00

If multiple redundant fsync calls are triggered, we don't need to write its
node pages with fsync mark continuously.

So, this patch adds FI_NEED_FSYNC to track whether the latest node block is
written with the fsync mark or not.
If the mark was set, a new fsync doesn't need to write a node block.
Otherwise, we should do a new node block with the mark for roll-forward
recovery.

Signed-off-by: Jaegeuk Kim

f2fs: remove unnecessary threshold

2014-03-20T13:10:09+00:00

The NM_WOUT_THRESHOLD is now obsolete since f2fs starts to control on a basis
of the memory footprint.

Signed-off-by: Jaegeuk Kim

f2fs: throttle the memory footprint with a sysfs entry

2014-03-20T13:10:09+00:00

This patch introduces ram_thresh, a sysfs entry, which controls the memory
footprint used by the free nid list and the nat cache.

Previously, the free nid list was controlled by MAX_FREE_NIDS, while the nat
cache was managed by NM_WOUT_THRESHOLD.
However, this approach cannot be applied dynamically according to the system.

So, this patch adds ram_thresh that users can specify the threshold, which is
in order of 1 / 1024.
For example, if the total ram size is 4GB and the value is set to 10 by default,
f2fs tries to control the number of free nids and nat caches not to consume over
10 * (4GB / 1024) = 10MB.

Signed-off-by: Jaegeuk Kim

f2fs: avoid to drop nat entries due to the negative nr_shrink

2014-03-20T13:10:08+00:00

The try_to_free_nats should not receive the negative nr_shrink.
Otherwise, it can drop all the nat entries by the while loop.

Signed-off-by: Jaegeuk Kim

f2fs: call f2fs_wait_on_page_writeback instead of native function

2014-03-20T13:10:04+00:00

If a page is on writeback, f2fs can face with deadlock due to under writepages.
This is caused by merging IOs inside f2fs, so if it comes to detect, let's throw
merged IOs, which is implemented by f2fs_wait_on_page_writeback.

Signed-off-by: Jaegeuk Kim

f2fs: introduce nr_pages_to_write for segment alignment

2014-03-18T07:37:53+00:00

This patch introduces nr_pages_to_write to align page writes to the segment
or other operational unit size, which can be tuned according to the system
environment.

Signed-off-by: Jaegeuk Kim

f2fs: increase pages_skipped when skipping writepages

2014-03-18T07:37:16+00:00

This patch increases pages_skipped when skipping writepages.

Signed-off-by: Jaegeuk Kim