ceph: sync read inline data
we can't use getattr to fetch inline data while holding Fr cap, because it can cause deadlock. If we need to sync read inline data, drop cap refs first, then use getattr to fetch inline data. Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
Ilya Dryomov
parent
3738daa68a
commit
83701246ae
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@ -192,17 +192,30 @@ static int readpage_nounlock(struct file *filp, struct page *page)
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struct ceph_osd_client *osdc =
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&ceph_inode_to_client(inode)->client->osdc;
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int err = 0;
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u64 off = page_offset(page);
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u64 len = PAGE_CACHE_SIZE;
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err = ceph_readpage_from_fscache(inode, page);
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if (off >= i_size_read(inode)) {
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zero_user_segment(page, err, PAGE_CACHE_SIZE);
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SetPageUptodate(page);
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return 0;
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}
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/*
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* Uptodate inline data should have been added into page cache
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* while getting Fcr caps.
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*/
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if (ci->i_inline_version != CEPH_INLINE_NONE)
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return -EINVAL;
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err = ceph_readpage_from_fscache(inode, page);
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if (err == 0)
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goto out;
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dout("readpage inode %p file %p page %p index %lu\n",
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inode, filp, page, page->index);
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err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
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(u64) page_offset(page), &len,
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off, &len,
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ci->i_truncate_seq, ci->i_truncate_size,
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&page, 1, 0);
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if (err == -ENOENT)
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@ -384,6 +397,9 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
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int rc = 0;
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int max = 0;
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if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
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return -EINVAL;
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rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
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&nr_pages);
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@ -1219,8 +1235,8 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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want = CEPH_CAP_FILE_CACHE;
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while (1) {
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got = 0;
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ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1,
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&got, &pinned_page);
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ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want,
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-1, &got, &pinned_page);
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if (ret == 0)
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break;
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if (ret != -ERESTARTSYS) {
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@ -1231,7 +1247,11 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
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inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got));
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ret = filemap_fault(vma, vmf);
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if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
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ci->i_inline_version == CEPH_INLINE_NONE)
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ret = filemap_fault(vma, vmf);
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else
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ret = -EAGAIN;
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dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
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inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret);
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@ -1239,6 +1259,42 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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page_cache_release(pinned_page);
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ceph_put_cap_refs(ci, got);
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if (ret != -EAGAIN)
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return ret;
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/* read inline data */
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if (off >= PAGE_CACHE_SIZE) {
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/* does not support inline data > PAGE_SIZE */
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ret = VM_FAULT_SIGBUS;
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} else {
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int ret1;
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struct address_space *mapping = inode->i_mapping;
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struct page *page = find_or_create_page(mapping, 0,
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mapping_gfp_mask(mapping) &
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~__GFP_FS);
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if (!page) {
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ret = VM_FAULT_OOM;
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goto out;
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}
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ret1 = __ceph_do_getattr(inode, page,
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CEPH_STAT_CAP_INLINE_DATA, true);
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if (ret1 < 0 || off >= i_size_read(inode)) {
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unlock_page(page);
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page_cache_release(page);
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ret = VM_FAULT_SIGBUS;
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goto out;
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}
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if (ret1 < PAGE_CACHE_SIZE)
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zero_user_segment(page, ret1, PAGE_CACHE_SIZE);
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else
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flush_dcache_page(page);
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SetPageUptodate(page);
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vmf->page = page;
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ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
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}
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out:
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dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
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inode, off, (size_t)PAGE_CACHE_SIZE, ret);
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return ret;
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}
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@ -333,6 +333,11 @@ int ceph_release(struct inode *inode, struct file *file)
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return 0;
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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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};
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/*
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* Read a range of bytes striped over one or more objects. Iterate over
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* objects we stripe over. (That's not atomic, but good enough for now.)
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@ -412,7 +417,7 @@ more:
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ret = read;
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/* did we bounce off eof? */
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if (pos + left > inode->i_size)
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*checkeof = 1;
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*checkeof = CHECK_EOF;
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}
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dout("striped_read returns %d\n", ret);
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@ -808,7 +813,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
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struct page *pinned_page = NULL;
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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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int retry_op = 0, read = 0;
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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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@ -830,8 +835,12 @@ again:
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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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/* hmm, this isn't really async... */
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ret = ceph_sync_read(iocb, to, &checkeof);
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if (ci->i_inline_version == CEPH_INLINE_NONE) {
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/* hmm, this isn't really async... */
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ret = ceph_sync_read(iocb, to, &retry_op);
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} else {
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retry_op = READ_INLINE;
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}
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} else {
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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), iocb->ki_pos, (unsigned)len,
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@ -846,12 +855,50 @@ again:
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pinned_page = NULL;
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}
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ceph_put_cap_refs(ci, got);
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if (retry_op && ret >= 0) {
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int statret;
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struct page *page = NULL;
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loff_t i_size;
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if (retry_op == READ_INLINE) {
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page = __page_cache_alloc(GFP_NOFS);
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if (!page)
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return -ENOMEM;
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}
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if (checkeof && ret >= 0) {
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int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
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statret = __ceph_do_getattr(inode, page,
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CEPH_STAT_CAP_INLINE_DATA, !!page);
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if (statret < 0) {
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__free_page(page);
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if (statret == -ENODATA) {
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BUG_ON(retry_op != READ_INLINE);
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goto again;
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}
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return statret;
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}
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i_size = i_size_read(inode);
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if (retry_op == READ_INLINE) {
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/* does not support inline data > PAGE_SIZE */
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if (i_size > PAGE_CACHE_SIZE) {
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ret = -EIO;
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} else if (iocb->ki_pos < i_size) {
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loff_t end = min_t(loff_t, i_size,
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iocb->ki_pos + len);
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if (statret < end)
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zero_user_segment(page, statret, end);
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ret = copy_page_to_iter(page,
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iocb->ki_pos & ~PAGE_MASK,
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end - iocb->ki_pos, to);
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iocb->ki_pos += ret;
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} else {
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ret = 0;
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}
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__free_pages(page, 0);
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return ret;
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}
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/* hit EOF or hole? */
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if (statret == 0 && iocb->ki_pos < inode->i_size &&
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if (retry_op == CHECK_EOF && iocb->ki_pos < 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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@ -859,7 +906,7 @@ again:
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read += ret;
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len -= ret;
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checkeof = 0;
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retry_op = 0;
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goto again;
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}
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}
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