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f2fs: avoid to allocate when inline_data was written

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The sceanrio is like this.
inline_data   i_size     page                 write_begin/vm_page_mkwrite
  X             30       dirty_page
  X             30                            write to #4096 position
  X             30       get_dnode_of_data    wait for get_dnode_of_data
  O             30       write inline_data
  O             30                            get_dnode_of_data
  O             30                            reserve data block
..

In this case, we have #0 = NEW_ADDR and inline_data as well.
We should not allow this condition for further access.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2014-10-17 20:33:55 -07:00
parent a78186ebe5
commit 9ba69cf987
2 changed files with 46 additions and 14 deletions
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28
fs/f2fs/file.c
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@@ -35,12 +35,13 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
struct inode *inode = file_inode(vma->vm_file);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct dnode_of_data dn;
struct page *ipage;
int err;
f2fs_balance_fs(sbi);
sb_start_pagefault(inode->i_sb);
retry:
/* force to convert with normal data indices */
err = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, page);
if (err)
@@ -48,11 +49,28 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
/* block allocation */
f2fs_lock_op(sbi);
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = f2fs_reserve_block(&dn, page->index);
f2fs_unlock_op(sbi);
if (err)
/* check inline_data */
ipage = get_node_page(sbi, inode->i_ino);
if (IS_ERR(ipage)) {
f2fs_unlock_op(sbi);
goto out;
}
if (f2fs_has_inline_data(inode)) {
f2fs_put_page(ipage, 1);
f2fs_unlock_op(sbi);
goto retry;
}
set_new_dnode(&dn, inode, ipage, NULL, 0);
err = f2fs_reserve_block(&dn, page->index);
if (err) {
f2fs_unlock_op(sbi);
goto out;
}
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
file_update_time(vma->vm_file);
lock_page(page);