linux-stable.git/fs/f2fs/segment.c, branch v4.4

f2fs: fix to clear GCed flag for atomic written page

2015-10-22T16:37:13+00:00

Atomic write page can be GCed, after committing this kind of page, we should
clear the GCed flag for it.

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

f2fs: don't need to submit bio on error case

2015-10-22T02:05:53+00:00

If commit_atomic_write is failed, we don't need to submit any bio.

Signed-off-by: Jaegeuk Kim

f2fs: refactor __find_rev_next_{zero}_bit

2015-10-21T22:26:00+00:00

This patch refactors __find_rev_next_{zero}_bit which was disabled previously
due to bugs.

Signed-off-by: Jaegeuk Kim

f2fs crypto: fix racing of accessing encrypted page among

2015-10-13T16:52:34+00:00

 different competitors

Since we use different page cache (normally inode's page cache for R/W
and meta inode's page cache for GC) to cache the same physical block
which is belong to an encrypted inode. Writeback of these two page
cache should be exclusive, but now we didn't handle writeback state
well, so there may be potential racing problem:

a)
kworker:				f2fs_gc:
 - f2fs_write_data_pages
  - f2fs_write_data_page
   - do_write_data_page
    - write_data_page
     - f2fs_submit_page_mbio
(page#1 in inode's page cache was queued
in f2fs bio cache, and be ready to write
to new blkaddr)
					 - gc_data_segment
					  - move_encrypted_block
					   - pagecache_get_page
					(page#2 in meta inode's page cache
					was cached with the invalid datas
					of physical block located in new
					blkaddr)
					   - f2fs_submit_page_mbio
					(page#1 was submitted, later, page#2
					with invalid data will be submitted)

b)
f2fs_gc:
 - gc_data_segment
  - move_encrypted_block
   - f2fs_submit_page_mbio
(page#1 in meta inode's page cache was
queued in f2fs bio cache, and be ready
to write to new blkaddr)
					user thread:
					 - f2fs_write_begin
					  - f2fs_submit_page_bio
					(we submit the request to block layer
					to update page#2 in inode's page cache
					with physical block located in new
					blkaddr, so here we may read gabbage
					data from new blkaddr since GC hasn't
					writebacked the page#1 yet)

This patch fixes above potential racing problem for encrypted inode.

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

f2fs: support lower priority asynchronous readahead in ra_meta_pages

2015-10-12T21:03:15+00:00

Now, we use ra_meta_pages to reads continuous physical blocks as much as
possible to improve performance of following reads. However, ra_meta_pages
uses a synchronous readahead approach by submitting bio with READ, as READ
is with high priority, it can not be used in the case of preloading blocks,
and it's not sure when these RAed pages will be used.

This patch supports asynchronous readahead in ra_meta_pages by tagging bio
with READA flag in order to allow preloading.

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

f2fs: don't tag REQ_META for temporary non-meta pages

2015-10-12T21:01:46+00:00

In recovery or checkpoint flow, we grab pages temperarily in meta inode's
mapping for caching temperary data, actually, datas in these pages were
not meta data of f2fs, but still we tag them with REQ_META flag. However,
lower device like eMMC may do some optimization for data of such type.
So in order to avoid wrong optimization, we'd better remove such flag
for temperary non-meta pages.

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

f2fs: fix SSA updates resulting in corruption

2015-10-12T20:38:02+00:00

The f2fs_collapse_range and f2fs_insert_range changes the block addresses
directly. But that can cause uncovered SSA updates.
In that case, we need to give up to change the block addresses and do buffered
writes to keep filesystem consistency.

Signed-off-by: Jaegeuk Kim

f2fs: introduce a periodic checkpoint flow

2015-10-09T23:20:57+00:00

This patch introduces a periodic checkpoint feature.
Note that, this is not enforcing to conduct checkpoints very strictly in terms
of trigger timing, instead just hope to help user experiences.
The default value is 60 seconds.

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

f2fs: support synchronous gc in ioctl

2015-10-09T23:20:56+00:00

This patch drops in batches gc triggered through ioctl, since user
can easily control the gc by designing the loop around the ->ioctl.

We support synchronous gc by forcing using FG_GC in f2fs_gc, so with
it, user can make sure that in this round all blocks gced were
persistent in the device until ioctl returned.

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

f2fs: use vmalloc to handle -ENOMEM error

2015-10-09T23:20:55+00:00

This patch introduces f2fs_kvmalloc to avoid -ENOMEM during mount.

Signed-off-by: Jaegeuk Kim