struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
- struct ceph_vino vino;
+ struct ceph_osd_client *osdc = &fsc->client->osdc;
struct ceph_osd_request *req;
struct page **pages;
u64 len;
int num_pages;
int written = 0;
- int flags;
int ret;
bool check_caps = false;
struct timespec64 mtime = current_time(inode);
size_t count = iov_iter_count(from);
- size_t off;
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
if (ret < 0)
dout("invalidate_inode_pages2_range returned %d\n", ret);
- flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
-
while ((len = iov_iter_count(from)) > 0) {
size_t left;
int n;
+ u64 write_pos = pos;
+ u64 write_len = len;
+ u64 objnum, objoff;
+ u32 xlen;
+ u64 assert_ver = 0;
+ bool rmw;
+ bool first, last;
+ struct iov_iter saved_iter = *from;
+ size_t off;
+
+ ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
+
+ /* clamp the length to the end of first object */
+ ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
+ write_len, &objnum, &objoff,
+ &xlen);
+ write_len = xlen;
+
+ /* adjust len downward if it goes beyond current object */
+ if (pos + len > write_pos + write_len)
+ len = write_pos + write_len - pos;
- vino = ceph_vino(inode);
- req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
- vino, pos, &len, 0, 1,
- CEPH_OSD_OP_WRITE, flags, snapc,
- ci->i_truncate_seq,
- ci->i_truncate_size,
- false);
- if (IS_ERR(req)) {
- ret = PTR_ERR(req);
- break;
- }
+ /*
+ * If we had to adjust the length or position to align with a
+ * crypto block, then we must do a read/modify/write cycle. We
+ * use a version assertion to redrive the thing if something
+ * changes in between.
+ */
+ first = pos != write_pos;
+ last = (pos + len) != (write_pos + write_len);
+ rmw = first || last;
- num_pages = calc_pages_for(pos, len);
+ dout("sync_write ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
+ ci->i_vino.ino, pos, len, write_pos, write_len,
+ rmw ? "" : "no ");
+
+ /*
+ * The data is emplaced into the page as it would be if it were
+ * in an array of pagecache pages.
+ */
+ num_pages = calc_pages_for(write_pos, write_len);
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
- goto out;
+ break;
+ }
+
+ /* Do we need to preload the pages? */
+ if (rmw) {
+ u64 first_pos = write_pos;
+ u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
+ u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
+ struct ceph_osd_req_op *op;
+
+ /* We should only need to do this for encrypted inodes */
+ WARN_ON_ONCE(!IS_ENCRYPTED(inode));
+
+ /* No need to do two reads if first and last blocks are same */
+ if (first && last_pos == first_pos)
+ last = false;
+
+ /*
+ * Allocate a read request for one or two extents,
+ * depending on how the request was aligned.
+ */
+ req = ceph_osdc_new_request(osdc, &ci->i_layout,
+ ci->i_vino, first ? first_pos : last_pos,
+ &read_len, 0, (first && last) ? 2 : 1,
+ CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
+ NULL, ci->i_truncate_seq,
+ ci->i_truncate_size, false);
+ if (IS_ERR(req)) {
+ ceph_release_page_vector(pages, num_pages);
+ ret = PTR_ERR(req);
+ break;
+ }
+
+ /* Something is misaligned! */
+ if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ ret = -EIO;
+ break;
+ }
+
+ /* Add extent for first block? */
+ op = &req->r_ops[0];
+
+ if (first) {
+ osd_req_op_extent_osd_data_pages(req, 0, pages,
+ CEPH_FSCRYPT_BLOCK_SIZE,
+ offset_in_page(first_pos),
+ false, false);
+ /* We only expect a single extent here */
+ ret = __ceph_alloc_sparse_ext_map(op, 1);
+ if (ret) {
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ }
+
+ /* Add extent for last block */
+ if (last) {
+ /* Init the other extent if first extent has been used */
+ if (first) {
+ op = &req->r_ops[1];
+ osd_req_op_extent_init(req, 1,
+ CEPH_OSD_OP_SPARSE_READ,
+ last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
+ ci->i_truncate_size,
+ ci->i_truncate_seq);
+ }
+
+ ret = __ceph_alloc_sparse_ext_map(op, 1);
+ if (ret) {
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+
+ osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
+ &pages[num_pages - 1],
+ CEPH_FSCRYPT_BLOCK_SIZE,
+ offset_in_page(last_pos),
+ false, false);
+ }
+
+ ceph_osdc_start_request(osdc, req);
+ ret = ceph_osdc_wait_request(osdc, req);
+
+ /* FIXME: length field is wrong if there are 2 extents */
+ ceph_update_read_metrics(&fsc->mdsc->metric,
+ req->r_start_latency,
+ req->r_end_latency,
+ read_len, ret);
+
+ /* Ok if object is not already present */
+ if (ret == -ENOENT) {
+ /*
+ * If there is no object, then we can't assert
+ * on its version. Set it to 0, and we'll use an
+ * exclusive create instead.
+ */
+ ceph_osdc_put_request(req);
+ ret = 0;
+
+ /*
+ * zero out the soon-to-be uncopied parts of the
+ * first and last pages.
+ */
+ if (first)
+ zero_user_segment(pages[0], 0,
+ offset_in_page(first_pos));
+ if (last)
+ zero_user_segment(pages[num_pages - 1],
+ offset_in_page(last_pos),
+ PAGE_SIZE);
+ } else {
+ if (ret < 0) {
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+
+ op = &req->r_ops[0];
+ if (op->extent.sparse_ext_cnt == 0) {
+ if (first)
+ zero_user_segment(pages[0], 0,
+ offset_in_page(first_pos));
+ else
+ zero_user_segment(pages[num_pages - 1],
+ offset_in_page(last_pos),
+ PAGE_SIZE);
+ } else if (op->extent.sparse_ext_cnt != 1 ||
+ ceph_sparse_ext_map_end(op) !=
+ CEPH_FSCRYPT_BLOCK_SIZE) {
+ ret = -EIO;
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+
+ if (first && last) {
+ op = &req->r_ops[1];
+ if (op->extent.sparse_ext_cnt == 0) {
+ zero_user_segment(pages[num_pages - 1],
+ offset_in_page(last_pos),
+ PAGE_SIZE);
+ } else if (op->extent.sparse_ext_cnt != 1 ||
+ ceph_sparse_ext_map_end(op) !=
+ CEPH_FSCRYPT_BLOCK_SIZE) {
+ ret = -EIO;
+ ceph_osdc_put_request(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ }
+
+ /* Grab assert version. It must be non-zero. */
+ assert_ver = req->r_version;
+ WARN_ON_ONCE(ret > 0 && assert_ver == 0);
+
+ ceph_osdc_put_request(req);
+ if (first) {
+ ret = ceph_fscrypt_decrypt_block_inplace(inode,
+ pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
+ offset_in_page(first_pos),
+ first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
+ if (ret < 0) {
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ }
+ if (last) {
+ ret = ceph_fscrypt_decrypt_block_inplace(inode,
+ pages[num_pages - 1],
+ CEPH_FSCRYPT_BLOCK_SIZE,
+ offset_in_page(last_pos),
+ last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
+ if (ret < 0) {
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ }
+ }
}
left = len;
for (n = 0; n < num_pages; n++) {
size_t plen = min_t(size_t, left, PAGE_SIZE - off);
+ /* copy the data */
ret = copy_page_from_iter(pages[n], off, plen, from);
- off = 0;
if (ret != plen) {
ret = -EFAULT;
break;
}
+ off = 0;
left -= ret;
}
-
if (ret < 0) {
+ dout("sync_write write failed with %d\n", ret);
ceph_release_page_vector(pages, num_pages);
- goto out;
+ break;
}
- req->r_inode = inode;
+ if (IS_ENCRYPTED(inode)) {
+ ret = ceph_fscrypt_encrypt_pages(inode, pages,
+ write_pos, write_len,
+ GFP_KERNEL);
+ if (ret < 0) {
+ dout("encryption failed with %d\n", ret);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ }
- osd_req_op_extent_osd_data_pages(req, 0, pages, len,
- offset_in_page(pos),
- false, true);
+ req = ceph_osdc_new_request(osdc, &ci->i_layout,
+ ci->i_vino, write_pos, &write_len,
+ rmw ? 1 : 0, rmw ? 2 : 1,
+ CEPH_OSD_OP_WRITE,
+ CEPH_OSD_FLAG_WRITE,
+ snapc, ci->i_truncate_seq,
+ ci->i_truncate_size, false);
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ ceph_release_page_vector(pages, num_pages);
+ break;
+ }
+ dout("sync_write write op %lld~%llu\n", write_pos, write_len);
+ osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
+ offset_in_page(write_pos), false,
+ true);
+ req->r_inode = inode;
req->r_mtime = mtime;
- ceph_osdc_start_request(&fsc->client->osdc, req);
- ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
+
+ /* Set up the assertion */
+ if (rmw) {
+ /*
+ * Set up the assertion. If we don't have a version
+ * number, then the object doesn't exist yet. Use an
+ * exclusive create instead of a version assertion in
+ * that case.
+ */
+ if (assert_ver) {
+ osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
+ req->r_ops[0].assert_ver.ver = assert_ver;
+ } else {
+ osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
+ CEPH_OSD_OP_FLAG_EXCL);
+ }
+ }
+
+ ceph_osdc_start_request(osdc, req);
+ ret = ceph_osdc_wait_request(osdc, req);
ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
req->r_end_latency, len, ret);
-out:
ceph_osdc_put_request(req);
if (ret != 0) {
+ dout("sync_write osd write returned %d\n", ret);
+ /* Version changed! Must re-do the rmw cycle */
+ if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
+ (!assert_ver && ret == -EEXIST)) {
+ /* We should only ever see this on a rmw */
+ WARN_ON_ONCE(!rmw);
+
+ /* The version should never go backward */
+ WARN_ON_ONCE(ret == -EOVERFLOW);
+
+ *from = saved_iter;
+
+ /* FIXME: limit number of times we loop? */
+ continue;
+ }
ceph_set_error_write(ci);
break;
}
ceph_clear_error_write(ci);
pos += len;
written += len;
+ dout("sync_write written %d\n", written);
if (pos > i_size_read(inode)) {
check_caps = ceph_inode_set_size(inode, pos);
if (check_caps)
ret = written;
iocb->ki_pos = pos;
}
+ dout("sync_write returning %d\n", ret);
return ret;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff