Hi,
2013-04-03 (수), 14:43 +0530, P J P:
> +-- On Wed, 3 Apr 2013, Jaegeuk Kim wrote --+
> | I'm confusing the question because f2fs doesn't use generic_writepages(),
> | since f2fs_write_data_pages() is linked to a_ops->writepages. In
> | do_writepages(), always f2fs_write_data_pages() is triggered instead of
> | generic_writepages(). Isn't it?
>
> Before commit fa9150a84c, when `generic_writepages' returned 0, it did not
> abort `f2fs_write_data_pages', as the proposed patch does. I was wondering if
> that's intentional OR if the patch below does it right?
>
> ===
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 7bd22a2..7be750e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -561,7 +561,7 @@ static int f2fs_write_data_pages(struct address_space
> *mapping,
> {
> struct inode *inode = mapping->host;
> struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
> - int ret;
> + int ret = 0;
> long excess_nrtw = 0, desired_nrtw;
>
> if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
> @@ -572,7 +572,9 @@ static int f2fs_write_data_pages(struct address_space *mapping,
>
> if (!S_ISDIR(inode->i_mode))
> mutex_lock(&sbi->writepages);
> - ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
> + /* deal with chardevs and other special file */
> + if (mapping->a_ops->writepage)
> + ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
Why should we take unnecessary locks and an f2fs_submit_bio call?
Thanks,
> if (!S_ISDIR(inode->i_mode))
> mutex_unlock(&sbi->writepages);
> f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL));
> ===
>
> Thank you.
> --
> Prasad J Pandit / Red Hat Security Response Team
> DB7A 84C5 D3F9 7CD1 B5EB C939 D048 7860 3655 602B
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--
Jaegeuk Kim
Samsung
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