>On 09/24/2013 04:05 PM, majianpeng wrote:
>> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
>> index 3de8982..5422d8e 100644
>> --- a/fs/ceph/file.c
>> +++ b/fs/ceph/file.c
>> @@ -408,51 +408,94 @@ more:
>> *
>> * If the read spans object boundary, just do multiple reads.
>> */
>> -static ssize_t ceph_sync_read(struct file *file, char __user *data,
>> - unsigned len, loff_t *poff, int *checkeof)
>> +static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
>> + int *checkeof)
>> {
>> + struct file *file = iocb->ki_filp;
>> struct inode *inode = file_inode(file);
>> struct page **pages;
>> - u64 off = *poff;
>> + u64 off = iocb->ki_pos;
>> int num_pages, ret;
>>
>> - dout("sync_read on file %p %llu~%u %s\n", file, off, len,
>> + dout("sync_read on file %p %llu~%u %s\n", file, off,
>> + (unsigned)iocb->ki_left,
>> (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
>> -
>> - if (file->f_flags & O_DIRECT) {
>> - num_pages = calc_pages_for((unsigned long)data, len);
>> - pages = ceph_get_direct_page_vector(data, num_pages, true);
>> - } else {
>> - num_pages = calc_pages_for(off, len);
>> - pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
>> - }
>> - if (IS_ERR(pages))
>> - return PTR_ERR(pages);
>> -
>> /*
>> * flush any page cache pages in this range. this
>> * will make concurrent normal and sync io slow,
>> * but it will at least behave sensibly when they are
>> * in sequence.
>> */
>> - ret = filemap_write_and_wait(inode->i_mapping);
>> + ret = filemap_write_and_wait_range(inode->i_mapping, off,
>> + off + iocb->ki_left);
>> if (ret < 0)
>> - goto done;
>> -
>> - ret = striped_read(inode, off, len, pages, num_pages, checkeof,
>> - file->f_flags & O_DIRECT,
>> - (unsigned long)data & ~PAGE_MASK);
>> + return ret;
>>
>> - if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
>> - ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
>> - if (ret >= 0)
>> - *poff = off + ret;
>> + if (file->f_flags & O_DIRECT) {
>> + while (iov_iter_count(i)) {
>> + void __user *data = i->iov[0].iov_base + i->iov_offset;
>> + size_t len = i->iov[0].iov_len - i->iov_offset;
>> +
>> + num_pages = calc_pages_for((unsigned long)data, len);
>> + pages = ceph_get_direct_page_vector(data,
>> + num_pages, true);
>> + if (IS_ERR(pages))
>> + return PTR_ERR(pages);
>> +
>> + ret = striped_read(inode, off, len,
>> + pages, num_pages, checkeof,
>> + 1, (unsigned long)data & ~PAGE_MASK);
>> + ceph_put_page_vector(pages, num_pages, true);
>> +
>> + if (ret <= 0)
>> + break;
>> + off += ret;
>> + iov_iter_advance(i, ret);
>> + if (ret < len)
>> + break;
>> + }
>> + } else {
>> + size_t len = iocb->ki_left;
>>
>> -done:
>> - if (file->f_flags & O_DIRECT)
>> - ceph_put_page_vector(pages, num_pages, true);
>> - else
>> + num_pages = calc_pages_for(off, len);
>> + pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
>> + if (IS_ERR(pages))
>> + return PTR_ERR(pages);
>> + ret = striped_read(inode, off, len, pages,
>> + num_pages, checkeof, 0, 0);
>> + if (ret > 0) {
>> + int l, k = 0;
>> + size_t left = len = ret;
>> +
>> + while (left) {
>> + void __user *data = i->iov[0].iov_base
>> + + i->iov_offset;
>> + l = min(i->iov[0].iov_len - i->iov_offset,
>> + left);
>> +
>> + ret = ceph_copy_page_vector_to_user(&pages[k],
>> + data, off,
>> + l);
>> + if (ret > 0) {
>> + iov_iter_advance(i, ret);
>> + left -= ret;
>> + off += ret;
>> + k = calc_pages_for(iocb->ki_pos,
>> + len - left + 1) - 1;
>> + BUG_ON(k >= num_pages && left);
>> + } else
>> + break;
>> + }
>> + }
>> ceph_release_page_vector(pages, num_pages);
>> + }
>> +
>> + if (off > iocb->ki_pos) {
>> + ret = off - iocb->ki_pos;
>> + iocb->ki_pos = off;
>> + iocb->ki_left -= ret;
>> + }
>> +
>> dout("sync_read result %d\n", ret);
>> return ret;
>> }
>> @@ -647,17 +690,16 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
>> {
>> struct file *filp = iocb->ki_filp;
>> struct ceph_file_info *fi = filp->private_data;
>> - loff_t *ppos = &iocb->ki_pos;
>> - size_t len = iov->iov_len;
>> + size_t len = 0;
>
>len = iocb->ki_left;
Because commit 73a7075e3f6ec63dc359064e, remove the "iocb->ki_left = len" in func do_sync_read.
So using iocb->ki_nbytes.
Thanks!
Jianpeng Maÿôèº{.nÇ+?·?®??+%?Ëÿ±éݶ¥?wÿº{.nÇ+?·?z?ÿuëÞ?ø§¶?¡Ü¨}©?²Æ zÚ&j:+v?¨þø ¯ù ®w¥þ?à2?Þ?¨èÚ&¢)ß¡«a¶Úÿÿûàz¿äz¹Þ?ú+?ù???Ý¢jÿ?wèþf
