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SubjectRe: [PATCH v2 4/6] mm/fs: add a sync_mode param for clear_page_dirty_for_io()
Hi John,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc3]
[cannot apply to next-20180629]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/john-hubbard-gmail-com/mm-fs-gup-don-t-unmap-or-drop-filesystem-buffers/20180702-090125
config: i386-randconfig-x075-201826 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

fs/f2fs/dir.c: In function 'f2fs_delete_entry':
>> fs/f2fs/dir.c:734:33: error: 'WB_SYNC_ALL' undeclared (first use in this function); did you mean 'FS_SYNC_FL'?
clear_page_dirty_for_io(page, WB_SYNC_ALL);
^~~~~~~~~~~
FS_SYNC_FL
fs/f2fs/dir.c:734:33: note: each undeclared identifier is reported only once for each function it appears in
--
fs/f2fs/inline.c: In function 'f2fs_convert_inline_page':
>> fs/f2fs/inline.c:139:50: error: dereferencing pointer to incomplete type 'struct writeback_control'
dirty = clear_page_dirty_for_io(page, fio.io_wbc->sync_mode);
^~
--
In file included from include/linux/kernel.h:10:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs/f2fs/checkpoint.c:11:
fs/f2fs/checkpoint.c: In function 'commit_checkpoint':
>> fs/f2fs/checkpoint.c:1200:49: error: invalid type argument of '->' (have 'struct writeback_control')
if (unlikely(!clear_page_dirty_for_io(page, wbc->sync_mode)))
^
include/linux/compiler.h:77:42: note: in definition of macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
--
fs/f2fs/data.c: In function 'f2fs_write_cache_pages':
>> fs/f2fs/data.c:2021:9: error: too few arguments to function 'clear_page_dirty_for_io'
if (!clear_page_dirty_for_io(page), wbc->sync_mode)
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/pagemap.h:8:0,
from include/linux/f2fs_fs.h:14,
from fs/f2fs/data.c:12:
include/linux/mm.h:1540:5: note: declared here
int clear_page_dirty_for_io(struct page *page, int sync_mode);
^~~~~~~~~~~~~~~~~~~~~~~
fs/f2fs/data.c:2021:38: warning: left-hand operand of comma expression has no effect [-Wunused-value]
if (!clear_page_dirty_for_io(page), wbc->sync_mode)
^

vim +734 fs/f2fs/dir.c

690
691 /*
692 * It only removes the dentry from the dentry page, corresponding name
693 * entry in name page does not need to be touched during deletion.
694 */
695 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
696 struct inode *dir, struct inode *inode)
697 {
698 struct f2fs_dentry_block *dentry_blk;
699 unsigned int bit_pos;
700 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
701 int i;
702
703 f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
704
705 if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT)
706 f2fs_add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO);
707
708 if (f2fs_has_inline_dentry(dir))
709 return f2fs_delete_inline_entry(dentry, page, dir, inode);
710
711 lock_page(page);
712 f2fs_wait_on_page_writeback(page, DATA, true);
713
714 dentry_blk = page_address(page);
715 bit_pos = dentry - dentry_blk->dentry;
716 for (i = 0; i < slots; i++)
717 __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
718
719 /* Let's check and deallocate this dentry page */
720 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
721 NR_DENTRY_IN_BLOCK,
722 0);
723 set_page_dirty(page);
724
725 dir->i_ctime = dir->i_mtime = current_time(dir);
726 f2fs_mark_inode_dirty_sync(dir, false);
727
728 if (inode)
729 f2fs_drop_nlink(dir, inode);
730
731 if (bit_pos == NR_DENTRY_IN_BLOCK &&
732 !f2fs_truncate_hole(dir, page->index, page->index + 1)) {
733 f2fs_clear_radix_tree_dirty_tag(page);
> 734 clear_page_dirty_for_io(page, WB_SYNC_ALL);
735 ClearPagePrivate(page);
736 ClearPageUptodate(page);
737 inode_dec_dirty_pages(dir);
738 f2fs_remove_dirty_inode(dir);
739 }
740 f2fs_put_page(page, 1);
741 }
742

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