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ceph: implement readv/preadv for sync operation
For readv/preadv sync-operatoin, ceph only do the first iov. Now implement this. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
majianpeng
Sage Weil
parent
e8344e6689
commit
8eb4efb091
156
fs/ceph/file.c
156
fs/ceph/file.c
@ -408,51 +408,92 @@ more:
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*
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* If the read spans object boundary, just do multiple reads.
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*/
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static ssize_t ceph_sync_read(struct file *file, char __user *data,
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unsigned len, loff_t *poff, int *checkeof)
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static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
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int *checkeof)
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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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struct page **pages;
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u64 off = *poff;
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u64 off = iocb->ki_pos;
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int num_pages, ret;
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size_t len = i->count;
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dout("sync_read on file %p %llu~%u %s\n", file, off, len,
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dout("sync_read on file %p %llu~%u %s\n", file, off,
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(unsigned)len,
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(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
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if (file->f_flags & O_DIRECT) {
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num_pages = calc_pages_for((unsigned long)data, len);
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pages = ceph_get_direct_page_vector(data, num_pages, true);
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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_NOFS);
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}
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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/*
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* flush any page cache pages in this range. this
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* will make concurrent normal and sync io slow,
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* but it will at least behave sensibly when they are
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* in sequence.
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*/
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ret = filemap_write_and_wait(inode->i_mapping);
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ret = filemap_write_and_wait_range(inode->i_mapping, off,
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off + len);
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if (ret < 0)
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goto done;
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return ret;
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ret = striped_read(inode, off, len, pages, num_pages, checkeof,
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file->f_flags & O_DIRECT,
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(unsigned long)data & ~PAGE_MASK);
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if (file->f_flags & O_DIRECT) {
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while (iov_iter_count(i)) {
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void __user *data = i->iov[0].iov_base + i->iov_offset;
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size_t len = i->iov[0].iov_len - i->iov_offset;
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if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
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ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
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if (ret >= 0)
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*poff = off + ret;
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num_pages = calc_pages_for((unsigned long)data, len);
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pages = ceph_get_direct_page_vector(data,
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num_pages, true);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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done:
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if (file->f_flags & O_DIRECT)
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ret = striped_read(inode, off, len,
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pages, num_pages, checkeof,
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1, (unsigned long)data & ~PAGE_MASK);
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ceph_put_page_vector(pages, num_pages, true);
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else
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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 < len)
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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_NOFS);
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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 = len = ret;
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while (left) {
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void __user *data = i->iov[0].iov_base
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+ i->iov_offset;
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l = min(i->iov[0].iov_len - i->iov_offset,
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left);
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ret = ceph_copy_page_vector_to_user(&pages[k],
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data, off,
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l);
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if (ret > 0) {
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iov_iter_advance(i, ret);
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left -= ret;
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off += ret;
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k = calc_pages_for(iocb->ki_pos,
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len - left + 1) - 1;
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BUG_ON(k >= num_pages && left);
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} else
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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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if (off > iocb->ki_pos) {
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ret = off - iocb->ki_pos;
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iocb->ki_pos = off;
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}
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dout("sync_read result %d\n", ret);
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return ret;
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}
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@ -758,55 +799,84 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
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{
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struct file *filp = iocb->ki_filp;
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struct ceph_file_info *fi = filp->private_data;
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loff_t *ppos = &iocb->ki_pos;
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size_t len = iov->iov_len;
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size_t len = iocb->ki_nbytes;
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struct inode *inode = file_inode(filp);
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struct ceph_inode_info *ci = ceph_inode(inode);
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void __user *base = iov->iov_base;
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ssize_t ret;
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int want, got = 0;
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int checkeof = 0, read = 0;
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dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
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inode, ceph_vinop(inode), pos, (unsigned)len, inode);
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again:
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dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
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inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
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if (fi->fmode & CEPH_FILE_MODE_LAZY)
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want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
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else
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want = CEPH_CAP_FILE_CACHE;
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ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
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if (ret < 0)
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return ret;
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if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
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(iocb->ki_filp->f_flags & O_DIRECT) ||
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(fi->flags & CEPH_F_SYNC)) {
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struct iov_iter i;
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dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
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inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
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ceph_cap_string(got));
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if (!read) {
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ret = generic_segment_checks(iov, &nr_segs,
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&len, VERIFY_WRITE);
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if (ret)
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goto out;
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}
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iov_iter_init(&i, iov, nr_segs, len, read);
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/* hmm, this isn't really async... */
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ret = ceph_sync_read(iocb, &i, &checkeof);
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} else {
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/*
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* We can't modify the content of iov,
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* so we only read from beginning.
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*/
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if (read) {
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iocb->ki_pos = pos;
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len = iocb->ki_nbytes;
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read = 0;
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}
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dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
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inode, ceph_vinop(inode), pos, (unsigned)len,
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ceph_cap_string(got));
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if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
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(iocb->ki_filp->f_flags & O_DIRECT) ||
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(fi->flags & CEPH_F_SYNC))
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/* hmm, this isn't really async... */
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ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
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else
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ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
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}
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out:
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dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
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inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
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ceph_put_cap_refs(ci, got);
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if (checkeof && ret >= 0) {
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int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
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int statret = ceph_do_getattr(inode,
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CEPH_STAT_CAP_SIZE);
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/* hit EOF or hole? */
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if (statret == 0 && *ppos < inode->i_size) {
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dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
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if (statret == 0 && iocb->ki_pos < inode->i_size &&
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ret < len) {
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dout("sync_read hit hole, ppos %lld < size %lld"
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", reading more\n", iocb->ki_pos,
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inode->i_size);
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read += ret;
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base += ret;
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len -= ret;
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checkeof = 0;
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goto again;
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}
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}
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if (ret >= 0)
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ret += read;
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