linux.git/fs/f2fs/node.c, branch v3.13

f2fs: remove unnecessary TestClearPageError when wait pages writeback

2013-11-04T03:24:01+00:00

In wait_on_node_pages_writeback we will test and clear error flag for all
pages in radix tree, but not necessary.
So we only do this for pages belong to the specified inode.

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

f2fs: avoid to wait all the node blocks during fsync

2013-10-31T07:01:03+00:00

Previously, f2fs_sync_file() waits for all the node blocks to be written.
But, we don't need to do that, but wait only the inode-related node blocks.

This patch adds wait_on_node_pages_writeback() in which waits inode-related
node blocks that are on writeback.

Signed-off-by: Jaegeuk Kim

f2fs: add an option to avoid unnecessary BUG_ONs

2013-10-29T06:44:38+00:00

If you want to remove unnecessary BUG_ONs, you can just turn off F2FS_CHECK_FS
in your kernel config.

Signed-off-by: Jaegeuk Kim

f2fs: add tracepoint for set_page_dirty

2013-10-25T07:54:40+00:00

This patch adds a tracepoint for set_page_dirty.

Signed-off-by: Jaegeuk Kim

f2fs: introduce f2fs_balance_fs_bg for some background jobs

2013-10-25T07:54:38+00:00

This patch merges some background jobs into this new function.

Signed-off-by: Changman Lee 
Signed-off-by: Jaegeuk Kim

f2fs: reclaim prefree segments periodically

2013-10-25T07:54:37+00:00

Previously, f2fs postpones reclaiming prefree segments into free segments
as much as possible.
However, if user writes and deletes a bunch of data without any sync or fsync
calls, some flash storages can suffer from garbage collections.

So, this patch adds the reclaiming codes to f2fs_write_node_pages and background
GC thread.

If there are a lot of prefree segments, let's do checkpoint so that f2fs
submits discard commands for the prefree regions to the flash storage.

Signed-off-by: Changman Lee 
Signed-off-by: Jaegeuk Kim

f2fs: use bool for booleans

2013-10-25T07:54:37+00:00

Signed-off-by: Haicheng Li 
Signed-off-by: Jaegeuk Kim

f2fs: introduce f2fs_kmem_cache_alloc to hide the unfailed, kmem cache allocation

2013-10-22T11:16:02+00:00

Introduce the unfailed version of kmem_cache_alloc named f2fs_kmem_cache_alloc
to hide the retry routine and make the code a bit cleaner.

v2:
   Fix the wrong use of 'retry' tag pointed out by Gao feng.
   Use more neat code to remove redundant tag suggested by Haicheng Li.

Signed-off-by: Gu Zheng 
Signed-off-by: Jaegeuk Kim

f2fs: avoid to write during the recovery

2013-10-18T00:44:14+00:00

This patch enhances the recovery routine not to write any data/node/meta until
its completion.
If any writes are sent to the disk, it could contaminate the written history
that will be used for further recovery.

Signed-off-by: Jaegeuk Kim

f2fs: merge more bios of node block writes

2013-09-05T01:17:19+00:00

Previously, we experience bio traces as follows when running simple sequential
write test.

 f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500104928, size = 4K
 f2fs_do_submit_bio: type = NODE, io = no sync, sector = 499922208, size = 368K
 f2fs_do_submit_bio: type = NODE, io = no sync, sector = 499914752, size = 140K

 -> total 512K

The first one is to write an indirect node block, and the others are to write
direct node blocks.

The reason why there are two separate bios for direct node blocks is:
0. initial state
------------------    ------------------
|                |    |xxxxxxxx        |
------------------    ------------------

1. write 368K
------------------    ------------------
|                |    |xxxxxxxxWWWWWWWW|
------------------    ------------------

2. write 140K
------------------    ------------------
|WWWWWWW         |    |xxxxxxxxWWWWWWWW|
------------------    ------------------

This is because f2fs_write_node_pages tries to write just 512K totally, so that
we can lose the chance to merge more bios nicely.

After this patch is applied, we can get the following bio traces.

  f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500103168, size = 8K
  f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500111368, size = 4K
  f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500107272, size = 512K
  f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500108296, size = 512K
  f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500109320, size = 500K

And finally, we can improve the sequential write performance,
    from 458.775 MB/s to 479.945 MB/s on SSD.

Signed-off-by: Jaegeuk Kim