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ceph: Asynchronous IO support
The basic idea of AIO support is simple, just call kiocb::ki_complete() in OSD request's complete callback. But there are several special cases. when IO span multiple objects, we need to wait until all OSD requests are complete, then call kiocb::ki_complete(). Error handling in this case is tricky too. For simplify, AIO both span multiple objects and extends i_size are not allowed. Another special case is check EOF for reading (other client can write to the file and extend i_size concurrently). For simplify, the direct-IO/AIO code path does do the check, fallback to normal syn read instead. Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
Ilya Dryomov
parent
458c4703ae
commit
c8fe9b17d0
395
fs/ceph/file.c
395
fs/ceph/file.c
@ -397,8 +397,9 @@ int ceph_release(struct inode *inode, struct file *file)
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}
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enum {
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CHECK_EOF = 1,
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READ_INLINE = 2,
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HAVE_RETRIED = 1,
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CHECK_EOF = 2,
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READ_INLINE = 3,
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};
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/*
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@ -411,17 +412,14 @@ enum {
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static int striped_read(struct inode *inode,
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u64 off, u64 len,
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struct page **pages, int num_pages,
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int *checkeof, bool o_direct,
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unsigned long buf_align)
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int *checkeof)
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{
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_inode_info *ci = ceph_inode(inode);
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u64 pos, this_len, left;
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int io_align, page_align;
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int pages_left;
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int read;
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int page_align, pages_left;
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int read, ret;
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struct page **page_pos;
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int ret;
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bool hit_stripe, was_short;
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/*
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@ -432,13 +430,9 @@ static int striped_read(struct inode *inode,
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page_pos = pages;
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pages_left = num_pages;
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read = 0;
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io_align = off & ~PAGE_MASK;
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more:
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if (o_direct)
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page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
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else
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page_align = pos & ~PAGE_MASK;
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page_align = pos & ~PAGE_MASK;
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this_len = left;
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ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
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&ci->i_layout, pos, &this_len,
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@ -457,8 +451,7 @@ more:
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if (was_short && (pos + ret < inode->i_size)) {
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int zlen = min(this_len - ret,
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inode->i_size - pos - ret);
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int zoff = (o_direct ? buf_align : io_align) +
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read + ret;
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int zoff = (off & ~PAGE_MASK) + read + ret;
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dout(" zero gap %llu to %llu\n",
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pos + ret, pos + ret + zlen);
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ceph_zero_page_vector_range(zoff, zlen, pages);
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@ -521,54 +514,28 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
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if (ret < 0)
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return ret;
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if (iocb->ki_flags & IOCB_DIRECT) {
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while (iov_iter_count(i)) {
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size_t start;
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ssize_t n;
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num_pages = calc_pages_for(off, len);
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pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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ret = striped_read(inode, off, len, pages,
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num_pages, checkeof);
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if (ret > 0) {
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int l, k = 0;
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size_t left = ret;
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n = dio_get_pagev_size(i);
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pages = dio_get_pages_alloc(i, n, &start, &num_pages);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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ret = striped_read(inode, off, n,
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pages, num_pages, checkeof,
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1, start);
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ceph_put_page_vector(pages, num_pages, true);
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if (ret <= 0)
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break;
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off += ret;
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iov_iter_advance(i, ret);
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if (ret < n)
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while (left) {
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size_t page_off = off & ~PAGE_MASK;
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size_t copy = min_t(size_t, left,
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PAGE_SIZE - page_off);
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l = copy_page_to_iter(pages[k++], page_off, copy, i);
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off += l;
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left -= l;
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if (l < copy)
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break;
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}
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} else {
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num_pages = calc_pages_for(off, len);
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pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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ret = striped_read(inode, off, len, pages,
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num_pages, checkeof, 0, 0);
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if (ret > 0) {
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int l, k = 0;
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size_t left = ret;
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while (left) {
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size_t page_off = off & ~PAGE_MASK;
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size_t copy = min_t(size_t,
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PAGE_SIZE - page_off, left);
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l = copy_page_to_iter(pages[k++], page_off,
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copy, i);
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off += l;
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left -= l;
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if (l < copy)
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break;
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}
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}
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ceph_release_page_vector(pages, num_pages);
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}
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ceph_release_page_vector(pages, num_pages);
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if (off > iocb->ki_pos) {
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ret = off - iocb->ki_pos;
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@ -579,6 +546,113 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
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return ret;
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}
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struct ceph_aio_request {
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struct kiocb *iocb;
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size_t total_len;
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int write;
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int error;
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struct list_head osd_reqs;
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unsigned num_reqs;
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atomic_t pending_reqs;
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struct ceph_cap_flush *prealloc_cf;
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};
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static void ceph_aio_complete(struct inode *inode,
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struct ceph_aio_request *aio_req)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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int ret;
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if (!atomic_dec_and_test(&aio_req->pending_reqs))
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return;
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ret = aio_req->error;
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if (!ret)
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ret = aio_req->total_len;
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dout("ceph_aio_complete %p rc %d\n", inode, ret);
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if (ret >= 0 && aio_req->write) {
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int dirty;
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loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
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if (endoff > i_size_read(inode)) {
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if (ceph_inode_set_size(inode, endoff))
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ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
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}
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spin_lock(&ci->i_ceph_lock);
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ci->i_inline_version = CEPH_INLINE_NONE;
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dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
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&aio_req->prealloc_cf);
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spin_unlock(&ci->i_ceph_lock);
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if (dirty)
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__mark_inode_dirty(inode, dirty);
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}
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ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
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CEPH_CAP_FILE_RD));
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aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
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ceph_free_cap_flush(aio_req->prealloc_cf);
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kfree(aio_req);
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}
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static void ceph_aio_complete_req(struct ceph_osd_request *req,
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struct ceph_msg *msg)
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{
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int rc = req->r_result;
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struct inode *inode = req->r_inode;
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struct ceph_aio_request *aio_req = req->r_priv;
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struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
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int num_pages = calc_pages_for((u64)osd_data->alignment,
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osd_data->length);
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dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
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inode, rc, osd_data->length);
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if (rc == -EOLDSNAPC) {
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BUG_ON(1);
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}
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if (!aio_req->write) {
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if (rc == -ENOENT)
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rc = 0;
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if (rc >= 0 && osd_data->length > rc) {
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int zoff = osd_data->alignment + rc;
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int zlen = osd_data->length - rc;
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/*
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* If read is satisfied by single OSD request,
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* it can pass EOF. Otherwise read is within
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* i_size.
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*/
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if (aio_req->num_reqs == 1) {
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loff_t i_size = i_size_read(inode);
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loff_t endoff = aio_req->iocb->ki_pos + rc;
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if (endoff < i_size)
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zlen = min_t(size_t, zlen,
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i_size - endoff);
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aio_req->total_len = rc + zlen;
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}
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if (zlen > 0)
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ceph_zero_page_vector_range(zoff, zlen,
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osd_data->pages);
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}
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}
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ceph_put_page_vector(osd_data->pages, num_pages, false);
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ceph_osdc_put_request(req);
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if (rc < 0)
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cmpxchg(&aio_req->error, 0, rc);
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ceph_aio_complete(inode, aio_req);
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return;
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}
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/*
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* Write commit request unsafe callback, called to tell us when a
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* request is unsafe (that is, in flight--has been handed to the
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@ -612,16 +686,10 @@ static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
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}
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/*
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* Synchronous write, straight from __user pointer or user pages.
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*
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* If write spans object boundary, just do multiple writes. (For a
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* correct atomic write, we should e.g. take write locks on all
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* objects, rollback on failure, etc.)
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*/
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static ssize_t
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ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
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struct ceph_snap_context *snapc)
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ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
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struct ceph_snap_context *snapc,
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struct ceph_cap_flush **pcf)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file_inode(file);
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@ -630,44 +698,52 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
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struct ceph_vino vino;
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struct ceph_osd_request *req;
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struct page **pages;
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int num_pages;
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int written = 0;
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struct ceph_aio_request *aio_req = NULL;
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int num_pages = 0;
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int flags;
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int check_caps = 0;
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int ret;
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struct timespec mtime = CURRENT_TIME;
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size_t count = iov_iter_count(from);
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size_t count = iov_iter_count(iter);
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loff_t pos = iocb->ki_pos;
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bool write = iov_iter_rw(iter) == WRITE;
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if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
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if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
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return -EROFS;
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dout("sync_direct_write on file %p %lld~%u\n", file, pos,
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(unsigned)count);
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dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
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(write ? "write" : "read"), file, pos, (unsigned)count);
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ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
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if (ret < 0)
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return ret;
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ret = invalidate_inode_pages2_range(inode->i_mapping,
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pos >> PAGE_CACHE_SHIFT,
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(pos + count) >> PAGE_CACHE_SHIFT);
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if (ret < 0)
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dout("invalidate_inode_pages2_range returned %d\n", ret);
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if (write) {
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ret = invalidate_inode_pages2_range(inode->i_mapping,
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pos >> PAGE_CACHE_SHIFT,
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(pos + count) >> PAGE_CACHE_SHIFT);
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if (ret < 0)
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dout("invalidate_inode_pages2_range returned %d\n", ret);
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flags = CEPH_OSD_FLAG_ORDERSNAP |
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CEPH_OSD_FLAG_ONDISK |
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CEPH_OSD_FLAG_WRITE;
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flags = CEPH_OSD_FLAG_ORDERSNAP |
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CEPH_OSD_FLAG_ONDISK |
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CEPH_OSD_FLAG_WRITE;
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} else {
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flags = CEPH_OSD_FLAG_READ;
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}
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while (iov_iter_count(from) > 0) {
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u64 len = dio_get_pagev_size(from);
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size_t start;
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ssize_t n;
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while (iov_iter_count(iter) > 0) {
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u64 size = dio_get_pagev_size(iter);
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size_t start = 0;
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ssize_t len;
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vino = ceph_vino(inode);
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req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
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vino, pos, &len, 0,
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2,/*include a 'startsync' command*/
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CEPH_OSD_OP_WRITE, flags, snapc,
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vino, pos, &size, 0,
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/*include a 'startsync' command*/
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write ? 2 : 1,
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write ? CEPH_OSD_OP_WRITE :
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CEPH_OSD_OP_READ,
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flags, snapc,
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ci->i_truncate_seq,
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ci->i_truncate_size,
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false);
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@ -676,10 +752,8 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
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break;
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}
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osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
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n = len;
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pages = dio_get_pages_alloc(from, len, &start, &num_pages);
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len = size;
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pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
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if (IS_ERR(pages)) {
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ceph_osdc_put_request(req);
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ret = PTR_ERR(pages);
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@ -687,47 +761,126 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
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}
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/*
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* throw out any page cache pages in this range. this
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* may block.
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* To simplify error handling, allow AIO when IO within i_size
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* or IO can be satisfied by single OSD request.
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*/
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truncate_inode_pages_range(inode->i_mapping, pos,
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(pos+n) | (PAGE_CACHE_SIZE-1));
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osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
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false, false);
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if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
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(len == count || pos + count <= i_size_read(inode))) {
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aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
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if (aio_req) {
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aio_req->iocb = iocb;
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aio_req->write = write;
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INIT_LIST_HEAD(&aio_req->osd_reqs);
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if (write) {
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swap(aio_req->prealloc_cf, *pcf);
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}
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}
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/* ignore error */
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}
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if (write) {
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/*
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* throw out any page cache pages in this range. this
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* may block.
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*/
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truncate_inode_pages_range(inode->i_mapping, pos,
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(pos+len) | (PAGE_CACHE_SIZE - 1));
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osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
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}
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osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
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false, false);
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/* BUG_ON(vino.snap != CEPH_NOSNAP); */
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ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
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ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
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if (aio_req) {
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aio_req->total_len += len;
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aio_req->num_reqs++;
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atomic_inc(&aio_req->pending_reqs);
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req->r_callback = ceph_aio_complete_req;
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req->r_inode = inode;
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req->r_priv = aio_req;
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list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
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pos += len;
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iov_iter_advance(iter, len);
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continue;
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}
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ret = ceph_osdc_start_request(req->r_osdc, req, false);
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if (!ret)
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ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
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size = i_size_read(inode);
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if (!write) {
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if (ret == -ENOENT)
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ret = 0;
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if (ret >= 0 && ret < len && pos + ret < size) {
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int zlen = min_t(size_t, len - ret,
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size - pos - ret);
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ceph_zero_page_vector_range(start + ret, zlen,
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pages);
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ret += zlen;
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}
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if (ret >= 0)
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len = ret;
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}
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ceph_put_page_vector(pages, num_pages, false);
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|
||||
ceph_osdc_put_request(req);
|
||||
if (ret)
|
||||
if (ret < 0)
|
||||
break;
|
||||
pos += n;
|
||||
written += n;
|
||||
iov_iter_advance(from, n);
|
||||
|
||||
if (pos > i_size_read(inode)) {
|
||||
check_caps = ceph_inode_set_size(inode, pos);
|
||||
if (check_caps)
|
||||
pos += len;
|
||||
iov_iter_advance(iter, len);
|
||||
|
||||
if (!write && pos >= size)
|
||||
break;
|
||||
|
||||
if (write && pos > size) {
|
||||
if (ceph_inode_set_size(inode, pos))
|
||||
ceph_check_caps(ceph_inode(inode),
|
||||
CHECK_CAPS_AUTHONLY,
|
||||
NULL);
|
||||
}
|
||||
}
|
||||
|
||||
if (ret != -EOLDSNAPC && written > 0) {
|
||||
if (aio_req) {
|
||||
if (aio_req->num_reqs == 0) {
|
||||
kfree(aio_req);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
|
||||
CEPH_CAP_FILE_RD);
|
||||
|
||||
while (!list_empty(&aio_req->osd_reqs)) {
|
||||
req = list_first_entry(&aio_req->osd_reqs,
|
||||
struct ceph_osd_request,
|
||||
r_unsafe_item);
|
||||
list_del_init(&req->r_unsafe_item);
|
||||
if (ret >= 0)
|
||||
ret = ceph_osdc_start_request(req->r_osdc,
|
||||
req, false);
|
||||
if (ret < 0) {
|
||||
req->r_result = ret;
|
||||
ceph_aio_complete_req(req, NULL);
|
||||
}
|
||||
}
|
||||
return -EIOCBQUEUED;
|
||||
}
|
||||
|
||||
if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
|
||||
ret = pos - iocb->ki_pos;
|
||||
iocb->ki_pos = pos;
|
||||
ret = written;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Synchronous write, straight from __user pointer or user pages.
|
||||
*
|
||||
@ -897,8 +1050,14 @@ again:
|
||||
ceph_cap_string(got));
|
||||
|
||||
if (ci->i_inline_version == CEPH_INLINE_NONE) {
|
||||
/* hmm, this isn't really async... */
|
||||
ret = ceph_sync_read(iocb, to, &retry_op);
|
||||
if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
|
||||
ret = ceph_direct_read_write(iocb, to,
|
||||
NULL, NULL);
|
||||
if (ret >= 0 && ret < len)
|
||||
retry_op = CHECK_EOF;
|
||||
} else {
|
||||
ret = ceph_sync_read(iocb, to, &retry_op);
|
||||
}
|
||||
} else {
|
||||
retry_op = READ_INLINE;
|
||||
}
|
||||
@ -916,7 +1075,7 @@ again:
|
||||
pinned_page = NULL;
|
||||
}
|
||||
ceph_put_cap_refs(ci, got);
|
||||
if (retry_op && ret >= 0) {
|
||||
if (retry_op > HAVE_RETRIED && ret >= 0) {
|
||||
int statret;
|
||||
struct page *page = NULL;
|
||||
loff_t i_size;
|
||||
@ -973,7 +1132,7 @@ again:
|
||||
|
||||
read += ret;
|
||||
len -= ret;
|
||||
retry_op = 0;
|
||||
retry_op = HAVE_RETRIED;
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
@ -1088,8 +1247,8 @@ retry_snap:
|
||||
/* we might need to revert back to that point */
|
||||
data = *from;
|
||||
if (iocb->ki_flags & IOCB_DIRECT)
|
||||
written = ceph_sync_direct_write(iocb, &data, pos,
|
||||
snapc);
|
||||
written = ceph_direct_read_write(iocb, &data, snapc,
|
||||
&prealloc_cf);
|
||||
else
|
||||
written = ceph_sync_write(iocb, &data, pos, snapc);
|
||||
if (written == -EOLDSNAPC) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user