linux.git/fs/f2fs/segment.c, branch v4.20

f2fs: fix data corruption issue with hardware encryption

2018-10-23T00:54:47+00:00

Direct IO can be used in case of hardware encryption. The following
scenario results into data corruption issue in this path -

Thread A -                          Thread B-
-> write file#1 in direct IO
                                    -> GC gets kicked in
                                    -> GC submitted bio on meta mapping
				       for file#1, but pending completion
-> write file#1 again with new data
   in direct IO
                                    -> GC bio gets completed now
                                    -> GC writes old data to the new
                                       location and thus file#1 is
				       corrupted.

Fix this by submitting and waiting for pending io on meta mapping
for direct IO case in f2fs_map_blocks().

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

f2fs: fix to spread clear_cold_data()

2018-10-23T00:54:46+00:00

We need to drop PG_checked flag on page as well when we clear PG_uptodate
flag, in order to avoid treating the page as GCing one later.

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

f2fs: use rb_*_cached friends

2018-10-16T16:36:59+00:00

As rbtree supports caching leftmost node natively, update f2fs codes
to use rb_*_cached helpers to speed up leftmost node visiting.

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

f2fs: checkpoint disabling

2018-10-16T16:36:39+00:00

Note that, it requires "f2fs: return correct errno in f2fs_gc".

This adds a lightweight non-persistent snapshotting scheme to f2fs.

To use, mount with the option checkpoint=disable, and to return to
normal operation, remount with checkpoint=enable. If the filesystem
is shut down before remounting with checkpoint=enable, it will revert
back to its apparent state when it was first mounted with
checkpoint=disable. This is useful for situations where you wish to be
able to roll back the state of the disk in case of some critical
failure.

Signed-off-by: Daniel Rosenberg 
[Jaegeuk Kim: use SB_RDONLY instead of MS_RDONLY]
Signed-off-by: Jaegeuk Kim

Revert: "f2fs: check last page index in cached bio to decide submission"

2018-10-01T01:39:54+00:00

There is one case that we can leave bio in f2fs, result in hanging
page writeback waiter.

Thread A				Thread B
- f2fs_write_cache_pages
 - f2fs_submit_page_write
 page #0 cached in bio #0 of cold log
 - f2fs_submit_page_write
 page #1 cached in bio #1 of warm log
					- f2fs_write_cache_pages
					 - f2fs_submit_page_write
					 bio is full, submit bio #1 contain page #1
 - f2fs_submit_merged_write_cond(, page #1)
 fail to submit bio #0 due to page #1 is not in any cached bios.

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

f2fs: add to account meta IO

2018-10-01T01:33:21+00:00

This patch supports to account meta IO, it enables to show write IO
from f2fs more comprehensively via 'status' debugfs entry.

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

f2fs: avoid f2fs_bug_on if f2fs_get_meta_page_nofail got EIO

2018-09-28T17:39:58+00:00

This patch avoids BUG_ON when f2fs_get_meta_page_nofail got EIO during
xfstests/generic/475.

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

f2fs: add new idle interval timing for discard and gc paths

2018-09-19T22:55:14+00:00

This helps to control the frequency of submission of discard and
GC requests independently, based on the need.

Suggested-by: Chao Yu 
Signed-off-by: Sahitya Tummala 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: add SPDX license identifiers

2018-09-12T20:07:10+00:00

Remove the verbose license text from f2fs files and replace them with
SPDX tags.  This does not change the license of any of the code.

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

f2fs: avoid wrong decrypted data from disk

2018-09-05T20:41:07+00:00

1. Create a file in an encrypted directory
2. Do GC & drop caches
3. Read stale data before its bio for metapage was not issued yet

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