linux-stable.git/fs/f2fs/node.c, branch v3.19

f2fs: do retry operations with cond_resched

2014-12-08T18:35:05+00:00

This patch revists retrial paths in f2fs.
The basic idea is to use cond_resched instead of retrying from the very early
stage.

Suggested-by: Gu Zheng 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: call radix_tree_preload before radix_tree_insert

2014-12-05T17:51:04+00:00

This patch tries to fix:

 BUG: using smp_processor_id() in preemptible [00000000] code: f2fs_gc-254:0/384
  (radix_tree_node_alloc+0x14/0x74) from [] (radix_tree_insert+0x110/0x200)
  (radix_tree_insert+0x110/0x200) from [] (gc_data_segment+0x340/0x52c)
  (gc_data_segment+0x340/0x52c) from [] (f2fs_gc+0x208/0x400)
  (f2fs_gc+0x208/0x400) from [] (gc_thread_func+0x248/0x28c)
  (gc_thread_func+0x248/0x28c) from [] (kthread+0xa0/0xac)
  (kthread+0xa0/0xac) from [] (ret_from_fork+0x14/0x3c)

The reason is that f2fs calls radix_tree_insert under enabled preemption.
So, before calling it, we need to call radix_tree_preload.

Otherwise, we should use _GFP_WAIT for the radix tree, and use mutex or
semaphore to cover the radix tree operations.

Signed-off-by: Jaegeuk Kim

f2fs: use rw_semaphore for nat entry lock

2014-12-04T05:23:29+00:00

Previoulsy, we used rwlock for nat_entry lock.
But, now we have a lot of complex operations in set_node_addr.
(e.g., allocating kernel memories, handling radix_trees, and so on)

So, this patches tries to change spinlock to rw_semaphore to give CPUs to other
threads.

Signed-off-by: Jaegeuk Kim

f2fs: fix missing kmem_cache_free

2014-12-04T00:40:28+00:00

This patch fixes missing kmem_cache_free when handling errors.

Signed-off-by: Jaegeuk Kim

f2fs: no more dirty_nat_entires when flushing

2014-11-26T01:26:36+00:00

After flushing dirty nat entries, it has to be no more dirty nat
entries.

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

f2fs: check dirty_nat_cnt before flushing nat entries in journal

2014-11-26T01:26:34+00:00

It's meaningless to check dirty_nat_cnt after re-dirtying nat entries in
journal. And although there are rooms for dirty nat entires if dirty_nat_cnt
is zero, it's also meaningless to check __has_cursum_space.

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

f2fs: fix typos for the word "destroy" in jump labels

2014-11-25T20:08:22+00:00

Two jump labels were adjusted in the implementation of the
create_node_manager_caches() function because these identifiers
contained typos.

Signed-off-by: Markus Elfring 
Acked-by: Randy Dunlap 
Signed-off-by: Jaegeuk Kim

f2fs: submit bio for node blocks in the reclaim path

2014-11-20T06:49:32+00:00

If a node page is request to be written during the reclaiming path, we should
submit the bio to avoid pending to recliam it.

Signed-off-by: Jaegeuk Kim

f2fs: introduce struct inode_management to wrap inner fields

2014-11-20T06:49:32+00:00

Now in f2fs, we have three inode cache: ORPHAN_INO, APPEND_INO, UPDATE_INO,
and we manage fields related to inode cache separately in struct f2fs_sb_info
for each inode cache type.
This makes codes a bit messy, so that this patch intorduce a new struct
inode_management to wrap inner fields as following which make codes more neat.

/* for inner inode cache management */
struct inode_management {
	struct radix_tree_root ino_root;	/* ino entry array */
	spinlock_t ino_lock;			/* for ino entry lock */
	struct list_head ino_list;		/* inode list head */
	unsigned long ino_num;			/* number of entries */
};

struct f2fs_sb_info {
	...
	struct inode_management im[MAX_INO_ENTRY];      /* manage inode cache */
	...
}

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

f2fs: write node pages if checkpoint is not doing

2014-11-10T14:51:28+00:00

It needs to write node pages if checkpoint is not doing in order to avoid
memory pressure.

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