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SubjectRe: [PATCH RFC] ext3 data=guarded v7
On Wed 29-04-09 16:53:44, Chris Mason wrote:
...
> +static int ext3_guarded_write_end(struct file *file,
> + struct address_space *mapping,
> + loff_t pos, unsigned len, unsigned copied,
> + struct page *page, void *fsdata)
> +{
> + handle_t *handle = ext3_journal_current_handle();
> + struct inode *inode = file->f_mapping->host;
> + unsigned from, to;
> + int ret = 0, ret2;
> +
> + copied = block_write_end(file, mapping, pos, len, copied,
> + page, fsdata);
> +
> + from = pos & (PAGE_CACHE_SIZE - 1);
> + to = from + copied;
> + ret = walk_page_buffers(handle, page_buffers(page),
> + from, to, NULL, journal_dirty_data_guarded_fn);
> +
> + /*
> + * we only update the in-memory i_size. The disk i_size is done
> + * by the end io handlers
> + */
> + if (ret == 0 && pos + copied > inode->i_size) {
> + int must_log;
> +
> + /* updated i_size, but we may have raced with a
> + * data=guarded end_io handler.
> + *
> + * All the guarded IO could have ended while i_size was still
> + * small, and if we're just adding bytes into an existing block
> + * in the file, we may not be adding a new guarded IO with this
> + * write. So, do a check on the disk i_size and make sure it
> + * is updated to the highest safe value.
> + *
> + * This may also be required if the
> + * journal_dirty_data_guarded_fn chose to do an fully
> + * ordered write of this buffer instead of a guarded
> + * write.
> + *
> + * ext3_ordered_update_i_size tests inode->i_size, so we
> + * make sure to update it with the ordered lock held.
> + */
> + ext3_ordered_lock(inode);
> + i_size_write(inode, pos + copied);
> + must_log = ext3_ordered_update_i_size(inode);
> + ext3_ordered_unlock(inode);
> +
> + orphan_del_trans(inode, must_log > 0);
> + }
Didn't we agree that only "i_size_write" should remain from the above
"if" after you changed journal_dirty_data_guarded_fn() function?

Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR


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