return rc;
}
-#if 0 // TODO remove 3594
-static void collect_uncached_write_data(struct cifs_aio_ctx *ctx);
-
-static void
-cifs_uncached_writev_complete(struct work_struct *work)
-{
- struct cifs_io_subrequest *wdata = container_of(work,
- struct cifs_io_subrequest, work);
- struct inode *inode = d_inode(wdata->cfile->dentry);
- struct cifsInodeInfo *cifsi = CIFS_I(inode);
-
- spin_lock(&inode->i_lock);
- cifs_update_eof(cifsi, wdata->subreq.start, wdata->subreq.len);
- if (cifsi->netfs.remote_i_size > inode->i_size)
- i_size_write(inode, cifsi->netfs.remote_i_size);
- spin_unlock(&inode->i_lock);
-
- complete(&wdata->done);
- collect_uncached_write_data(wdata->ctx);
- /* the below call can possibly free the last ref to aio ctx */
- cifs_put_writedata(wdata);
-}
-
-static int
-cifs_resend_wdata(struct cifs_io_subrequest *wdata, struct list_head *wdata_list,
- struct cifs_aio_ctx *ctx)
-{
- size_t wsize;
- struct cifs_credits credits;
- int rc;
- struct TCP_Server_Info *server = wdata->server;
-
- do {
- if (wdata->cfile->invalidHandle) {
- rc = cifs_reopen_file(wdata->cfile, false);
- if (rc == -EAGAIN)
- continue;
- else if (rc)
- break;
- }
-
-
- /*
- * Wait for credits to resend this wdata.
- * Note: we are attempting to resend the whole wdata not in
- * segments
- */
- do {
- rc = server->ops->wait_mtu_credits(server, wdata->subreq.len,
- &wsize, &credits);
- if (rc)
- goto fail;
-
- if (wsize < wdata->subreq.len) {
- add_credits_and_wake_if(server, &credits, 0);
- msleep(1000);
- }
- } while (wsize < wdata->subreq.len);
- wdata->credits = credits;
-
- rc = adjust_credits(server, &wdata->credits, wdata->subreq.len);
-
- if (!rc) {
- if (wdata->cfile->invalidHandle)
- rc = -EAGAIN;
- else {
- set_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (wdata->mr) {
- wdata->mr->need_invalidate = true;
- smbd_deregister_mr(wdata->mr);
- wdata->mr = NULL;
- }
-#endif
- rc = server->ops->async_writev(wdata);
- }
- }
-
- /* If the write was successfully sent, we are done */
- if (!rc) {
- list_add_tail(&wdata->list, wdata_list);
- return 0;
- }
-
- /* Roll back credits and retry if needed */
- add_credits_and_wake_if(server, &wdata->credits, 0);
- } while (rc == -EAGAIN);
-
-fail:
- cifs_put_writedata(wdata);
- return rc;
-}
-
-/*
- * Select span of a bvec iterator we're going to use. Limit it by both maximum
- * size and maximum number of segments.
- */
-static size_t cifs_limit_bvec_subset(const struct iov_iter *iter, size_t max_size,
- size_t max_segs, unsigned int *_nsegs)
-{
- const struct bio_vec *bvecs = iter->bvec;
- unsigned int nbv = iter->nr_segs, ix = 0, nsegs = 0;
- size_t len, span = 0, n = iter->count;
- size_t skip = iter->iov_offset;
-
- if (WARN_ON(!iov_iter_is_bvec(iter)) || n == 0)
- return 0;
-
- while (n && ix < nbv && skip) {
- len = bvecs[ix].bv_len;
- if (skip < len)
- break;
- skip -= len;
- n -= len;
- ix++;
- }
-
- while (n && ix < nbv) {
- len = min3(n, bvecs[ix].bv_len - skip, max_size);
- span += len;
- max_size -= len;
- nsegs++;
- ix++;
- if (max_size == 0 || nsegs >= max_segs)
- break;
- skip = 0;
- n -= len;
- }
-
- *_nsegs = nsegs;
- return span;
-}
-
-static int
-cifs_write_from_iter(loff_t fpos, size_t len, struct iov_iter *from,
- struct cifsFileInfo *open_file,
- struct cifs_sb_info *cifs_sb, struct list_head *wdata_list,
- struct cifs_aio_ctx *ctx)
-{
- int rc = 0;
- size_t cur_len, max_len;
- struct cifs_io_subrequest *wdata;
- pid_t pid;
- struct TCP_Server_Info *server;
- unsigned int xid, max_segs = INT_MAX;
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
- pid = open_file->pid;
- else
- pid = current->tgid;
-
- server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
- xid = get_xid();
-
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (server->smbd_conn)
- max_segs = server->smbd_conn->max_frmr_depth;
-#endif
-
- do {
- struct cifs_credits credits_on_stack;
- struct cifs_credits *credits = &credits_on_stack;
- unsigned int nsegs = 0;
- size_t wsize;
-
- if (signal_pending(current)) {
- rc = -EINTR;
- break;
- }
-
- if (open_file->invalidHandle) {
- rc = cifs_reopen_file(open_file, false);
- if (rc == -EAGAIN)
- continue;
- else if (rc)
- break;
- }
-
- rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
- &wsize, credits);
- if (rc)
- break;
-
- max_len = min_t(const size_t, len, wsize);
- if (!max_len) {
- rc = -EAGAIN;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- cur_len = cifs_limit_bvec_subset(from, max_len, max_segs, &nsegs);
- cifs_dbg(FYI, "write_from_iter len=%zx/%zx nsegs=%u/%lu/%u\n",
- cur_len, max_len, nsegs, from->nr_segs, max_segs);
- if (cur_len == 0) {
- rc = -EIO;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- wdata = cifs_writedata_alloc(cifs_uncached_writev_complete);
- if (!wdata) {
- rc = -ENOMEM;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- wdata->uncached = true;
- wdata->sync_mode = WB_SYNC_ALL;
- wdata->subreq.start = (__u64)fpos;
- wdata->cfile = cifsFileInfo_get(open_file);
- wdata->server = server;
- wdata->pid = pid;
- wdata->subreq.len = cur_len;
- wdata->credits = credits_on_stack;
- wdata->subreq.io_iter = *from;
- wdata->ctx = ctx;
- kref_get(&ctx->refcount);
-
- iov_iter_truncate(&wdata->subreq.io_iter, cur_len);
-
- rc = adjust_credits(server, &wdata->credits, wdata->subreq.len);
-
- if (!rc) {
- if (wdata->cfile->invalidHandle)
- rc = -EAGAIN;
- else
- rc = server->ops->async_writev(wdata);
- }
-
- if (rc) {
- add_credits_and_wake_if(server, &wdata->credits, 0);
- cifs_put_writedata(wdata);
- if (rc == -EAGAIN)
- continue;
- break;
- }
-
- list_add_tail(&wdata->list, wdata_list);
- iov_iter_advance(from, cur_len);
- fpos += cur_len;
- len -= cur_len;
- } while (len > 0);
-
- free_xid(xid);
- return rc;
-}
-
-static void collect_uncached_write_data(struct cifs_aio_ctx *ctx)
-{
- struct cifs_io_subrequest *wdata, *tmp;
- struct cifs_tcon *tcon;
- struct cifs_sb_info *cifs_sb;
- struct dentry *dentry = ctx->cfile->dentry;
- ssize_t rc;
-
- tcon = tlink_tcon(ctx->cfile->tlink);
- cifs_sb = CIFS_SB(dentry->d_sb);
-
- mutex_lock(&ctx->aio_mutex);
-
- if (list_empty(&ctx->list)) {
- mutex_unlock(&ctx->aio_mutex);
- return;
- }
-
- rc = ctx->rc;
- /*
- * Wait for and collect replies for any successful sends in order of
- * increasing offset. Once an error is hit, then return without waiting
- * for any more replies.
- */
-restart_loop:
- list_for_each_entry_safe(wdata, tmp, &ctx->list, list) {
- if (!rc) {
- if (!try_wait_for_completion(&wdata->done)) {
- mutex_unlock(&ctx->aio_mutex);
- return;
- }
-
- if (wdata->result)
- rc = wdata->result;
- else
- ctx->total_len += wdata->subreq.len;
-
- /* resend call if it's a retryable error */
- if (rc == -EAGAIN) {
- struct list_head tmp_list;
- struct iov_iter tmp_from = ctx->iter;
-
- INIT_LIST_HEAD(&tmp_list);
- list_del_init(&wdata->list);
-
- if (ctx->direct_io)
- rc = cifs_resend_wdata(
- wdata, &tmp_list, ctx);
- else {
- iov_iter_advance(&tmp_from,
- wdata->subreq.start - ctx->pos);
-
- rc = cifs_write_from_iter(wdata->subreq.start,
- wdata->subreq.len, &tmp_from,
- ctx->cfile, cifs_sb, &tmp_list,
- ctx);
-
- cifs_put_writedata(wdata);
- }
-
- list_splice(&tmp_list, &ctx->list);
- goto restart_loop;
- }
- }
- list_del_init(&wdata->list);
- cifs_put_writedata(wdata);
- }
-
- cifs_stats_bytes_written(tcon, ctx->total_len);
- set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags);
-
- ctx->rc = (rc == 0) ? ctx->total_len : rc;
-
- mutex_unlock(&ctx->aio_mutex);
-
- if (ctx->iocb && ctx->iocb->ki_complete)
- ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
- else
- complete(&ctx->done);
-}
-
-static ssize_t __cifs_writev(
- struct kiocb *iocb, struct iov_iter *from, bool direct)
-{
- struct file *file = iocb->ki_filp;
- ssize_t total_written = 0;
- struct cifsFileInfo *cfile;
- struct cifs_tcon *tcon;
- struct cifs_sb_info *cifs_sb;
- struct cifs_aio_ctx *ctx;
- int rc;
-
- rc = generic_write_checks(iocb, from);
- if (rc <= 0)
- return rc;
-
- cifs_sb = CIFS_FILE_SB(file);
- cfile = file->private_data;
- tcon = tlink_tcon(cfile->tlink);
-
- if (!tcon->ses->server->ops->async_writev)
- return -ENOSYS;
-
- ctx = cifs_aio_ctx_alloc();
- if (!ctx)
- return -ENOMEM;
-
- ctx->cfile = cifsFileInfo_get(cfile);
-
- if (!is_sync_kiocb(iocb))
- ctx->iocb = iocb;
-
- ctx->pos = iocb->ki_pos;
- ctx->direct_io = direct;
- ctx->nr_pinned_pages = 0;
-
- if (user_backed_iter(from)) {
- /*
- * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
- * they contain references to the calling process's virtual
- * memory layout which won't be available in an async worker
- * thread. This also takes a pin on every folio involved.
- */
- rc = netfs_extract_user_iter(from, iov_iter_count(from),
- &ctx->iter, 0);
- if (rc < 0) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return rc;
- }
-
- ctx->nr_pinned_pages = rc;
- ctx->bv = (void *)ctx->iter.bvec;
- ctx->bv_need_unpin = iov_iter_extract_will_pin(from);
- } else if ((iov_iter_is_bvec(from) || iov_iter_is_kvec(from)) &&
- !is_sync_kiocb(iocb)) {
- /*
- * If the op is asynchronous, we need to copy the list attached
- * to a BVEC/KVEC-type iterator, but we assume that the storage
- * will be pinned by the caller; in any case, we may or may not
- * be able to pin the pages, so we don't try.
- */
- ctx->bv = (void *)dup_iter(&ctx->iter, from, GFP_KERNEL);
- if (!ctx->bv) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return -ENOMEM;
- }
- } else {
- /*
- * Otherwise, we just pass the iterator down as-is and rely on
- * the caller to make sure the pages referred to by the
- * iterator don't evaporate.
- */
- ctx->iter = *from;
- }
-
- ctx->len = iov_iter_count(&ctx->iter);
-
- /* grab a lock here due to read response handlers can access ctx */
- mutex_lock(&ctx->aio_mutex);
-
- rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &ctx->iter,
- cfile, cifs_sb, &ctx->list, ctx);
-
- /*
- * If at least one write was successfully sent, then discard any rc
- * value from the later writes. If the other write succeeds, then
- * we'll end up returning whatever was written. If it fails, then
- * we'll get a new rc value from that.
- */
- if (!list_empty(&ctx->list))
- rc = 0;
-
- mutex_unlock(&ctx->aio_mutex);
-
- if (rc) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return rc;
- }
-
- if (!is_sync_kiocb(iocb)) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return -EIOCBQUEUED;
- }
-
- rc = wait_for_completion_killable(&ctx->done);
- if (rc) {
- mutex_lock(&ctx->aio_mutex);
- ctx->rc = rc = -EINTR;
- total_written = ctx->total_len;
- mutex_unlock(&ctx->aio_mutex);
- } else {
- rc = ctx->rc;
- total_written = ctx->total_len;
- }
-
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
-
- if (unlikely(!total_written))
- return rc;
-
- iocb->ki_pos += total_written;
- return total_written;
-}
-
-ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from)
-{
- struct file *file = iocb->ki_filp;
-
- cifs_revalidate_mapping(file->f_inode);
- return __cifs_writev(iocb, from, true);
-}
-
-ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
-{
- return __cifs_writev(iocb, from, false);
-}
-#endif // TODO remove 3594
-
static ssize_t
cifs_writev(struct kiocb *iocb, struct iov_iter *from)
{
return written;
}
-#if 0 // TODO remove 4143
-static struct cifs_io_subrequest *cifs_readdata_alloc(work_func_t complete)
-{
- struct cifs_io_subrequest *rdata;
-
- rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
- if (rdata) {
- refcount_set(&rdata->subreq.ref, 1);
- INIT_LIST_HEAD(&rdata->list);
- init_completion(&rdata->done);
- INIT_WORK(&rdata->work, complete);
- }
-
- return rdata;
-}
-
-void
-cifs_readdata_release(struct cifs_io_subrequest *rdata)
-{
- if (rdata->ctx)
- kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (rdata->mr) {
- smbd_deregister_mr(rdata->mr);
- rdata->mr = NULL;
- }
-#endif
- if (rdata->cfile)
- cifsFileInfo_put(rdata->cfile);
-
- kfree(rdata);
-}
-
-static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
-
-static void
-cifs_uncached_readv_complete(struct work_struct *work)
-{
- struct cifs_io_subrequest *rdata =
- container_of(work, struct cifs_io_subrequest, work);
-
- complete(&rdata->done);
- collect_uncached_read_data(rdata->ctx);
- /* the below call can possibly free the last ref to aio ctx */
- cifs_put_readdata(rdata);
-}
-
-static int cifs_resend_rdata(struct cifs_io_subrequest *rdata,
- struct list_head *rdata_list,
- struct cifs_aio_ctx *ctx)
-{
- size_t rsize;
- struct cifs_credits credits;
- int rc;
- struct TCP_Server_Info *server;
-
- /* XXX: should we pick a new channel here? */
- server = rdata->server;
-
- do {
- if (rdata->cfile->invalidHandle) {
- rc = cifs_reopen_file(rdata->cfile, true);
- if (rc == -EAGAIN)
- continue;
- else if (rc)
- break;
- }
-
- /*
- * Wait for credits to resend this rdata.
- * Note: we are attempting to resend the whole rdata not in
- * segments
- */
- do {
- rc = server->ops->wait_mtu_credits(server, rdata->subreq.len,
- &rsize, &credits);
-
- if (rc)
- goto fail;
-
- if (rsize < rdata->subreq.len) {
- add_credits_and_wake_if(server, &credits, 0);
- msleep(1000);
- }
- } while (rsize < rdata->subreq.len);
- rdata->credits = credits;
-
- rc = adjust_credits(server, &rdata->credits, rdata->subreq.len);
- if (!rc) {
- if (rdata->cfile->invalidHandle)
- rc = -EAGAIN;
- else {
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (rdata->mr) {
- rdata->mr->need_invalidate = true;
- smbd_deregister_mr(rdata->mr);
- rdata->mr = NULL;
- }
-#endif
- rc = server->ops->async_readv(rdata);
- }
- }
-
- /* If the read was successfully sent, we are done */
- if (!rc) {
- /* Add to aio pending list */
- list_add_tail(&rdata->list, rdata_list);
- return 0;
- }
-
- /* Roll back credits and retry if needed */
- add_credits_and_wake_if(server, &rdata->credits, 0);
- } while (rc == -EAGAIN);
-
-fail:
- cifs_put_readdata(rdata);
- return rc;
-}
-
-static int
-cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
- struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
- struct cifs_aio_ctx *ctx)
-{
- struct cifs_io_subrequest *rdata;
- unsigned int nsegs, max_segs = INT_MAX;
- struct cifs_credits credits_on_stack;
- struct cifs_credits *credits = &credits_on_stack;
- size_t cur_len, max_len, rsize;
- int rc;
- pid_t pid;
- struct TCP_Server_Info *server;
-
- server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
-
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (server->smbd_conn)
- max_segs = server->smbd_conn->max_frmr_depth;
-#endif
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
- pid = open_file->pid;
- else
- pid = current->tgid;
-
- do {
- if (open_file->invalidHandle) {
- rc = cifs_reopen_file(open_file, true);
- if (rc == -EAGAIN)
- continue;
- else if (rc)
- break;
- }
-
- if (cifs_sb->ctx->rsize == 0)
- cifs_sb->ctx->rsize =
- server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
- cifs_sb->ctx);
-
- rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
- &rsize, credits);
- if (rc)
- break;
-
- max_len = min_t(size_t, len, rsize);
-
- cur_len = cifs_limit_bvec_subset(&ctx->iter, max_len,
- max_segs, &nsegs);
- cifs_dbg(FYI, "read-to-iter len=%zx/%zx nsegs=%u/%lu/%u\n",
- cur_len, max_len, nsegs, ctx->iter.nr_segs, max_segs);
- if (cur_len == 0) {
- rc = -EIO;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- rdata = cifs_readdata_alloc(cifs_uncached_readv_complete);
- if (!rdata) {
- add_credits_and_wake_if(server, credits, 0);
- rc = -ENOMEM;
- break;
- }
-
- rdata->server = server;
- rdata->cfile = cifsFileInfo_get(open_file);
- rdata->subreq.start = fpos;
- rdata->subreq.len = cur_len;
- rdata->pid = pid;
- rdata->credits = credits_on_stack;
- rdata->ctx = ctx;
- kref_get(&ctx->refcount);
-
- rdata->subreq.io_iter = ctx->iter;
- iov_iter_truncate(&rdata->subreq.io_iter, cur_len);
-
- rc = adjust_credits(server, &rdata->credits, rdata->subreq.len);
-
- if (!rc) {
- if (rdata->cfile->invalidHandle)
- rc = -EAGAIN;
- else
- rc = server->ops->async_readv(rdata);
- }
-
- if (rc) {
- add_credits_and_wake_if(server, &rdata->credits, 0);
- cifs_put_readdata(rdata);
- if (rc == -EAGAIN)
- continue;
- break;
- }
-
- list_add_tail(&rdata->list, rdata_list);
- iov_iter_advance(&ctx->iter, cur_len);
- fpos += cur_len;
- len -= cur_len;
- } while (len > 0);
-
- return rc;
-}
-
-static void
-collect_uncached_read_data(struct cifs_aio_ctx *ctx)
-{
- struct cifs_io_subrequest *rdata, *tmp;
- struct cifs_sb_info *cifs_sb;
- int rc;
-
- cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb);
-
- mutex_lock(&ctx->aio_mutex);
-
- if (list_empty(&ctx->list)) {
- mutex_unlock(&ctx->aio_mutex);
- return;
- }
-
- rc = ctx->rc;
- /* the loop below should proceed in the order of increasing offsets */
-again:
- list_for_each_entry_safe(rdata, tmp, &ctx->list, list) {
- if (!rc) {
- if (!try_wait_for_completion(&rdata->done)) {
- mutex_unlock(&ctx->aio_mutex);
- return;
- }
-
- if (rdata->result == -EAGAIN) {
- /* resend call if it's a retryable error */
- struct list_head tmp_list;
- unsigned int got_bytes = rdata->got_bytes;
-
- list_del_init(&rdata->list);
- INIT_LIST_HEAD(&tmp_list);
-
- if (ctx->direct_io) {
- /*
- * Re-use rdata as this is a
- * direct I/O
- */
- rc = cifs_resend_rdata(
- rdata,
- &tmp_list, ctx);
- } else {
- rc = cifs_send_async_read(
- rdata->subreq.start + got_bytes,
- rdata->subreq.len - got_bytes,
- rdata->cfile, cifs_sb,
- &tmp_list, ctx);
-
- cifs_put_readdata(rdata);
- }
-
- list_splice(&tmp_list, &ctx->list);
-
- goto again;
- } else if (rdata->result)
- rc = rdata->result;
-
- /* if there was a short read -- discard anything left */
- if (rdata->got_bytes && rdata->got_bytes < rdata->subreq.len)
- rc = -ENODATA;
-
- ctx->total_len += rdata->got_bytes;
- }
- list_del_init(&rdata->list);
- cifs_put_readdata(rdata);
- }
-
- /* mask nodata case */
- if (rc == -ENODATA)
- rc = 0;
-
- ctx->rc = (rc == 0) ? (ssize_t)ctx->total_len : rc;
-
- mutex_unlock(&ctx->aio_mutex);
-
- if (ctx->iocb && ctx->iocb->ki_complete)
- ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
- else
- complete(&ctx->done);
-}
-
-static ssize_t __cifs_readv(
- struct kiocb *iocb, struct iov_iter *to, bool direct)
-{
- size_t len;
- struct file *file = iocb->ki_filp;
- struct cifs_sb_info *cifs_sb;
- struct cifsFileInfo *cfile;
- struct cifs_tcon *tcon;
- ssize_t rc, total_read = 0;
- loff_t offset = iocb->ki_pos;
- struct cifs_aio_ctx *ctx;
-
- len = iov_iter_count(to);
- if (!len)
- return 0;
-
- cifs_sb = CIFS_FILE_SB(file);
- cfile = file->private_data;
- tcon = tlink_tcon(cfile->tlink);
-
- if (!tcon->ses->server->ops->async_readv)
- return -ENOSYS;
-
- if ((file->f_flags & O_ACCMODE) == O_WRONLY)
- cifs_dbg(FYI, "attempting read on write only file instance\n");
-
- ctx = cifs_aio_ctx_alloc();
- if (!ctx)
- return -ENOMEM;
-
- ctx->pos = offset;
- ctx->direct_io = direct;
- ctx->len = len;
- ctx->cfile = cifsFileInfo_get(cfile);
- ctx->nr_pinned_pages = 0;
-
- if (!is_sync_kiocb(iocb))
- ctx->iocb = iocb;
-
- if (user_backed_iter(to)) {
- /*
- * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
- * they contain references to the calling process's virtual
- * memory layout which won't be available in an async worker
- * thread. This also takes a pin on every folio involved.
- */
- rc = netfs_extract_user_iter(to, iov_iter_count(to),
- &ctx->iter, 0);
- if (rc < 0) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return rc;
- }
-
- ctx->nr_pinned_pages = rc;
- ctx->bv = (void *)ctx->iter.bvec;
- ctx->bv_need_unpin = iov_iter_extract_will_pin(to);
- ctx->should_dirty = true;
- } else if ((iov_iter_is_bvec(to) || iov_iter_is_kvec(to)) &&
- !is_sync_kiocb(iocb)) {
- /*
- * If the op is asynchronous, we need to copy the list attached
- * to a BVEC/KVEC-type iterator, but we assume that the storage
- * will be retained by the caller; in any case, we may or may
- * not be able to pin the pages, so we don't try.
- */
- ctx->bv = (void *)dup_iter(&ctx->iter, to, GFP_KERNEL);
- if (!ctx->bv) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return -ENOMEM;
- }
- } else {
- /*
- * Otherwise, we just pass the iterator down as-is and rely on
- * the caller to make sure the pages referred to by the
- * iterator don't evaporate.
- */
- ctx->iter = *to;
- }
-
- if (direct) {
- rc = filemap_write_and_wait_range(file->f_inode->i_mapping,
- offset, offset + len - 1);
- if (rc) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return -EAGAIN;
- }
- }
-
- /* grab a lock here due to read response handlers can access ctx */
- mutex_lock(&ctx->aio_mutex);
-
- rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx);
-
- /* if at least one read request send succeeded, then reset rc */
- if (!list_empty(&ctx->list))
- rc = 0;
-
- mutex_unlock(&ctx->aio_mutex);
-
- if (rc) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return rc;
- }
-
- if (!is_sync_kiocb(iocb)) {
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
- return -EIOCBQUEUED;
- }
-
- rc = wait_for_completion_killable(&ctx->done);
- if (rc) {
- mutex_lock(&ctx->aio_mutex);
- ctx->rc = rc = -EINTR;
- total_read = ctx->total_len;
- mutex_unlock(&ctx->aio_mutex);
- } else {
- rc = ctx->rc;
- total_read = ctx->total_len;
- }
-
- kref_put(&ctx->refcount, cifs_aio_ctx_release);
-
- if (total_read) {
- iocb->ki_pos += total_read;
- return total_read;
- }
- return rc;
-}
-
-ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to)
-{
- return __cifs_readv(iocb, to, true);
-}
-
-ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to)
-{
- return __cifs_readv(iocb, to, false);
-
-}
-#endif // end netfslib removal 4143
-
ssize_t cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
ssize_t rc;
return rc;
}
-#if 0 // TODO remove 4633
-static ssize_t
-cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
-{
- int rc = -EACCES;
- unsigned int bytes_read = 0;
- unsigned int total_read;
- unsigned int current_read_size;
- unsigned int rsize;
- struct cifs_sb_info *cifs_sb;
- struct cifs_tcon *tcon;
- struct TCP_Server_Info *server;
- unsigned int xid;
- char *cur_offset;
- struct cifsFileInfo *open_file;
- struct cifs_io_parms io_parms = {0};
- int buf_type = CIFS_NO_BUFFER;
- __u32 pid;
-
- xid = get_xid();
- cifs_sb = CIFS_FILE_SB(file);
-
- /* FIXME: set up handlers for larger reads and/or convert to async */
- rsize = min_t(unsigned int, cifs_sb->ctx->rsize, CIFSMaxBufSize);
-
- if (file->private_data == NULL) {
- rc = -EBADF;
- free_xid(xid);
- return rc;
- }
- open_file = file->private_data;
- tcon = tlink_tcon(open_file->tlink);
- server = cifs_pick_channel(tcon->ses);
-
- if (!server->ops->sync_read) {
- free_xid(xid);
- return -ENOSYS;
- }
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
- pid = open_file->pid;
- else
- pid = current->tgid;
-
- if ((file->f_flags & O_ACCMODE) == O_WRONLY)
- cifs_dbg(FYI, "attempting read on write only file instance\n");
-
- for (total_read = 0, cur_offset = read_data; read_size > total_read;
- total_read += bytes_read, cur_offset += bytes_read) {
- do {
- current_read_size = min_t(uint, read_size - total_read,
- rsize);
- /*
- * For windows me and 9x we do not want to request more
- * than it negotiated since it will refuse the read
- * then.
- */
- if (!(tcon->ses->capabilities &
- tcon->ses->server->vals->cap_large_files)) {
- current_read_size = min_t(uint,
- current_read_size, CIFSMaxBufSize);
- }
- if (open_file->invalidHandle) {
- rc = cifs_reopen_file(open_file, true);
- if (rc != 0)
- break;
- }
- io_parms.pid = pid;
- io_parms.tcon = tcon;
- io_parms.offset = *offset;
- io_parms.length = current_read_size;
- io_parms.server = server;
- rc = server->ops->sync_read(xid, &open_file->fid, &io_parms,
- &bytes_read, &cur_offset,
- &buf_type);
- } while (rc == -EAGAIN);
-
- if (rc || (bytes_read == 0)) {
- if (total_read) {
- break;
- } else {
- free_xid(xid);
- return rc;
- }
- } else {
- cifs_stats_bytes_read(tcon, total_read);
- *offset += bytes_read;
- }
- }
- free_xid(xid);
- return total_read;
-}
-#endif // end netfslib remove 4633
-
-
static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf)
{
return netfs_page_mkwrite(vmf, NULL);
projects / linux.git / commitdiff