>On 09/09/2013 10:09 AM, majianpeng wrote:
>>> On 09/06/2013 04:48 PM, majianpeng wrote:
>>>> For readv/preadv sync-operatoin, ceph only do the first iov.
>>>> It don't think other iovs.Now implement this.
>>>>
>>>> V2:
>>>> -add generic_segment_checks
>>>> -using struct iov_iter replace cloning the iovs.
>>>> -return previous successfully copied if ceph_copy_page_vector_to_user
>>>> met error.
>>>>
>>>> Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
>>>> ---
>>>> fs/ceph/file.c | 174 ++++++++++++++++++++++++++++++++++++++++-----------------
>>>> 1 file changed, 123 insertions(+), 51 deletions(-)
>>>>
>>>> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
>>>> index 3de8982..1c28c52 100644
>>>> --- a/fs/ceph/file.c
>>>> +++ b/fs/ceph/file.c
>>>> @@ -408,51 +408,109 @@ 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;
>>>> - int num_pages, ret;
>>>> + u64 off = iocb->ki_pos;
>>>> + int num_pages, ret, n;
>>>>
>>>> - 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;
>>>> + return ret;
>>>>
>>>> - ret = striped_read(inode, off, len, pages, num_pages, checkeof,
>>>> - file->f_flags & O_DIRECT,
>>>> - (unsigned long)data & ~PAGE_MASK);
>>>> + if (file->f_flags & O_DIRECT) {
>>>> + for (n = 0; n < i->nr_segs; n++) {
>>>> + void __user *data = i->iov[n].iov_base;
>>>> + size_t len = i->iov[n].iov_len;
>>>> +
>>>> + if (n == 0) {
>>>> + len -= i->iov_offset;
>>>> + data += 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;
>>>> + if (ret < len)
>>>> + break;
>>>> + }
>>>>
>>>> - 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 (off > iocb->ki_pos) {
>>>> + ret = off - iocb->ki_pos;
>>>> + iocb->ki_pos = off;
>>>> + iocb->ki_left -= ret;
>>>> + }
>>>> + } 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);
>>>> + len = ret;
>>>> + if (len) {
>>>> + int l, k = 0;
>>>> + size_t left = len;
>>>> +
>>>> + for (n = 0; n < i->nr_segs && left; n++) {
>>>> + void __user *data = i->iov[n].iov_base;
>>>> + l = min(left, i->iov[n].iov_len);
>>>> +
>>>> + if (n == 0) {
>>>> + data += 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) {
>>>> + left -= ret;
>>>> + off += ret;
>>>> + k = calc_pages_for(iocb->ki_pos,
>>>> + len - left + 1) - 1;
>>>> + BUG_ON(k >= num_pages && left);
>>>> + } else
>>>> + break;
>>>> + }
>>>
>>> I think it's better to call iov_iter_advance() here instead of in ceph_aio_read(),
>>> and change the code to something like:
>>> ----
>>> while (iov_iter_count(&i) && left > 0) {
>>> void __user *data = i->iov->iov_base + i->iov_offset;
>>> l = min(left, i->iov->iov_len - i->iov_offset);
>>>
>>> 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;
>>> }
>>>
>>>
>>> rest change looks good.
>>>
>>> Regards
>>> Yan, Zheng
>>>
>> Thanks!
>> Jianpeng Ma
>>
>>
>> Subject:ceph: Implement readv/preadv for sync operation.
>>
>> For readv/preadv sync-operatoin, ceph only do the first iov.
>> It don't think other iovs.Now implement this.
>>
>> V2:
>> -add generic_segment_checks
>> -using struct iov_iter replace cloning the iovs.
>> -return previous successfully copied if ceph_copy_page_vector_to_user
>> met error.
>>
>> Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
>> ---
>> fs/ceph/file.c | 171 ++++++++++++++++++++++++++++++++++++++++-----------------
>> 1 file changed, 120 insertions(+), 51 deletions(-)
>>
>> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
>> index 3de8982..78018c9 100644
>> --- a/fs/ceph/file.c
>> +++ b/fs/ceph/file.c
>> @@ -408,51 +408,106 @@ 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;
>> - int num_pages, ret;
>> + u64 off = iocb->ki_pos;
>> + int num_pages, ret, n;
>>
>> - 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;
>> + return ret;
>>
>> - ret = striped_read(inode, off, len, pages, num_pages, checkeof,
>> - file->f_flags & O_DIRECT,
>> - (unsigned long)data & ~PAGE_MASK);
>> + if (file->f_flags & O_DIRECT) {
>> + for (n = 0; n < i->nr_segs; n++) {
>> + void __user *data = i->iov[n].iov_base;
>> + size_t len = i->iov[n].iov_len;
>> +
>> + if (n == 0) {
>> + len -= i->iov_offset;
>> + data += 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;
>> + if (ret < len)
>> + break;
>> + }
>>
>> - 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 (off > iocb->ki_pos) {
>> + ret = off - iocb->ki_pos;
>> + iocb->ki_pos = off;
>> + iocb->ki_left -= ret;
>> + }
>> + } 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);
>> + len = ret;
>> + if (len) {
>> + int l, k = 0;
>> + size_t left = len;
>> +
>> + while (left) {
>> + void __user *data = i->iov[0].iov_base
>> + + i->iov_offset;
>> + l = min(i->iov[0].iov_len - i->iov_offset,
>> + len);
>> +
>> + 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;
>> + }
>> +
>> + len -= left;
>> + if (len > 0) {
>> + iocb->ki_pos += len;
>> + iocb->ki_left -= len;
>> + ret = len;
>> + }
>> + }
>> ceph_release_page_vector(pages, num_pages);
>> + }
>> +
>> dout("sync_read result %d\n", ret);
>> return ret;
>> }
>> @@ -647,55 +702,69 @@ 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;
>> struct inode *inode = file_inode(filp);
>> struct ceph_inode_info *ci = ceph_inode(inode);
>> - void __user *base = iov->iov_base;
>> ssize_t ret;
>> int want, got = 0;
>> int checkeof = 0, read = 0;
>>
>> +
>> dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
>> inode, ceph_vinop(inode), pos, (unsigned)len, inode);
>> -again:
>> +
>> + ret = generic_segment_checks(iov, &nr_segs, &len, VERIFY_WRITE);
>> + if (ret)
>> + return ret;
>> +
>> if (fi->fmode & CEPH_FILE_MODE_LAZY)
>> want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
>> else
>> want = CEPH_CAP_FILE_CACHE;
>> ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
>> if (ret < 0)
>> - goto out;
>> + return ret;
>> +
>> dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
>> inode, ceph_vinop(inode), pos, (unsigned)len,
>> ceph_cap_string(got));
>>
>> if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
>> (iocb->ki_filp->f_flags & O_DIRECT) ||
>> - (fi->flags & CEPH_F_SYNC))
>> + (fi->flags & CEPH_F_SYNC)) {
>> + struct iov_iter i;
>> +
>> + iocb->ki_left = len;
>> + iov_iter_init(&i, iov, nr_segs, len, 0);
>> +again:
>> /* hmm, this isn't really async... */
>> - ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
>> - else
>> + ret = ceph_sync_read(iocb, &i, &checkeof);
>> +
>> + if (checkeof && ret >= 0) {
>> + int statret = ceph_do_getattr(inode,
>> + CEPH_STAT_CAP_SIZE);
>> +
>> + /* hit EOF or hole? */
>> + if (statret == 0 && iocb->ki_pos < inode->i_size &&
>> + iocb->ki_left) {
>> + dout("sync_read hit hole, ppos %lld < size %lld"
>> + ", reading more\n", iocb->ki_pos,
>> + inode->i_size);
>> +
>> + read += ret;
>> + iov_iter_advance(&i, ret);
>
>I think this "iov_iter_advance" is superfluous. Other than this, your patch looks
>good.
>
No, i made a error.In ceph_sync_read, for direct mode, i don't use iov_iter_advance.
But for sync mode, i used.So it's error.
I'll check carefully and resend again.
Thanks!
Jianpeng Ma
>By the way, your email is base64 encoded. please make your email client use plain text instead.
>
>Regards
>Yan, Zheng
>
>
>
>> + checkeof = 0;
>> + goto again;
>> + }
>> + }
>> +
>> + } else
>> ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
>>
>> -out:
>> dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
>> inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
>> ceph_put_cap_refs(ci, got);
>>
>> - if (checkeof && ret >= 0) {
>> - int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
>> -
>> - /* hit EOF or hole? */
>> - if (statret == 0 && *ppos < inode->i_size) {
>> - dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
>> - read += ret;
>> - base += ret;
>> - len -= ret;
>> - checkeof = 0;
>> - goto again;
>> - }
>> - }
>> if (ret >= 0)
>> ret += read;
>>
>>
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