diff options
Diffstat (limited to 'fs/fuse/file.c')
| -rw-r--r-- | fs/fuse/file.c | 2719 |
1 files changed, 2426 insertions, 293 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 676b0bc8a86..40ac2628ddc 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1,6 +1,6 @@ /* FUSE: Filesystem in Userspace - Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> + Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> This program can be distributed under the terms of the GNU GPL. See the file COPYING. @@ -12,18 +12,22 @@ #include <linux/slab.h> #include <linux/kernel.h> #include <linux/sched.h> +#include <linux/module.h> +#include <linux/compat.h> +#include <linux/swap.h> +#include <linux/aio.h> +#include <linux/falloc.h> static const struct file_operations fuse_direct_io_file_operations; -static int fuse_send_open(struct inode *inode, struct file *file, int isdir, - struct fuse_open_out *outargp) +static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + int opcode, struct fuse_open_out *outargp) { - struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_open_in inarg; struct fuse_req *req; int err; - req = fuse_get_req(fc); + req = fuse_get_req_nopages(fc); if (IS_ERR(req)) return PTR_ERR(req); @@ -31,35 +35,45 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir, inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); if (!fc->atomic_o_trunc) inarg.flags &= ~O_TRUNC; - req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; - req->in.h.nodeid = get_node_id(inode); + req->in.h.opcode = opcode; + req->in.h.nodeid = nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; req->out.numargs = 1; req->out.args[0].size = sizeof(*outargp); req->out.args[0].value = outargp; - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; fuse_put_request(fc, req); return err; } -struct fuse_file *fuse_file_alloc(void) +struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) { struct fuse_file *ff; + ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); - if (ff) { - ff->reserved_req = fuse_request_alloc(); - if (!ff->reserved_req) { - kfree(ff); - ff = NULL; - } else { - INIT_LIST_HEAD(&ff->write_entry); - atomic_set(&ff->count, 0); - } + if (unlikely(!ff)) + return NULL; + + ff->fc = fc; + ff->reserved_req = fuse_request_alloc(0); + if (unlikely(!ff->reserved_req)) { + kfree(ff); + return NULL; } + + INIT_LIST_HEAD(&ff->write_entry); + atomic_set(&ff->count, 0); + RB_CLEAR_NODE(&ff->polled_node); + init_waitqueue_head(&ff->poll_wait); + + spin_lock(&fc->lock); + ff->kh = ++fc->khctr; + spin_unlock(&fc->lock); + return ff; } @@ -69,124 +83,266 @@ void fuse_file_free(struct fuse_file *ff) kfree(ff); } -static struct fuse_file *fuse_file_get(struct fuse_file *ff) +struct fuse_file *fuse_file_get(struct fuse_file *ff) { atomic_inc(&ff->count); return ff; } -static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) +static void fuse_release_async(struct work_struct *work) { - dput(req->misc.release.dentry); - mntput(req->misc.release.vfsmount); + struct fuse_req *req; + struct fuse_conn *fc; + struct path path; + + req = container_of(work, struct fuse_req, misc.release.work); + path = req->misc.release.path; + fc = get_fuse_conn(path.dentry->d_inode); + fuse_put_request(fc, req); + path_put(&path); } -static void fuse_file_put(struct fuse_file *ff) +static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) +{ + if (fc->destroy_req) { + /* + * If this is a fuseblk mount, then it's possible that + * releasing the path will result in releasing the + * super block and sending the DESTROY request. If + * the server is single threaded, this would hang. + * For this reason do the path_put() in a separate + * thread. + */ + atomic_inc(&req->count); + INIT_WORK(&req->misc.release.work, fuse_release_async); + schedule_work(&req->misc.release.work); + } else { + path_put(&req->misc.release.path); + } +} + +static void fuse_file_put(struct fuse_file *ff, bool sync) { if (atomic_dec_and_test(&ff->count)) { struct fuse_req *req = ff->reserved_req; - struct inode *inode = req->misc.release.dentry->d_inode; - struct fuse_conn *fc = get_fuse_conn(inode); - req->end = fuse_release_end; - request_send_background(fc, req); + + if (ff->fc->no_open) { + /* + * Drop the release request when client does not + * implement 'open' + */ + req->background = 0; + path_put(&req->misc.release.path); + fuse_put_request(ff->fc, req); + } else if (sync) { + req->background = 0; + fuse_request_send(ff->fc, req); + path_put(&req->misc.release.path); + fuse_put_request(ff->fc, req); + } else { + req->end = fuse_release_end; + req->background = 1; + fuse_request_send_background(ff->fc, req); + } kfree(ff); } } -void fuse_finish_open(struct inode *inode, struct file *file, - struct fuse_file *ff, struct fuse_open_out *outarg) +int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + bool isdir) { - if (outarg->open_flags & FOPEN_DIRECT_IO) + struct fuse_file *ff; + int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; + + ff = fuse_file_alloc(fc); + if (!ff) + return -ENOMEM; + + ff->fh = 0; + ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */ + if (!fc->no_open || isdir) { + struct fuse_open_out outarg; + int err; + + err = fuse_send_open(fc, nodeid, file, opcode, &outarg); + if (!err) { + ff->fh = outarg.fh; + ff->open_flags = outarg.open_flags; + + } else if (err != -ENOSYS || isdir) { + fuse_file_free(ff); + return err; + } else { + fc->no_open = 1; + } + } + + if (isdir) + ff->open_flags &= ~FOPEN_DIRECT_IO; + + ff->nodeid = nodeid; + file->private_data = fuse_file_get(ff); + + return 0; +} +EXPORT_SYMBOL_GPL(fuse_do_open); + +static void fuse_link_write_file(struct file *file) +{ + struct inode *inode = file_inode(file); + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_file *ff = file->private_data; + /* + * file may be written through mmap, so chain it onto the + * inodes's write_file list + */ + spin_lock(&fc->lock); + if (list_empty(&ff->write_entry)) + list_add(&ff->write_entry, &fi->write_files); + spin_unlock(&fc->lock); +} + +void fuse_finish_open(struct inode *inode, struct file *file) +{ + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = get_fuse_conn(inode); + + if (ff->open_flags & FOPEN_DIRECT_IO) file->f_op = &fuse_direct_io_file_operations; - if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) + if (!(ff->open_flags & FOPEN_KEEP_CACHE)) invalidate_inode_pages2(inode->i_mapping); - ff->fh = outarg->fh; - file->private_data = fuse_file_get(ff); + if (ff->open_flags & FOPEN_NONSEEKABLE) + nonseekable_open(inode, file); + if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { + struct fuse_inode *fi = get_fuse_inode(inode); + + spin_lock(&fc->lock); + fi->attr_version = ++fc->attr_version; + i_size_write(inode, 0); + spin_unlock(&fc->lock); + fuse_invalidate_attr(inode); + if (fc->writeback_cache) + file_update_time(file); + } + if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache) + fuse_link_write_file(file); } -int fuse_open_common(struct inode *inode, struct file *file, int isdir) +int fuse_open_common(struct inode *inode, struct file *file, bool isdir) { - struct fuse_open_out outarg; - struct fuse_file *ff; + struct fuse_conn *fc = get_fuse_conn(inode); int err; - - /* VFS checks this, but only _after_ ->open() */ - if (file->f_flags & O_DIRECT) - return -EINVAL; + bool lock_inode = (file->f_flags & O_TRUNC) && + fc->atomic_o_trunc && + fc->writeback_cache; err = generic_file_open(inode, file); if (err) return err; - ff = fuse_file_alloc(); - if (!ff) - return -ENOMEM; + if (lock_inode) + mutex_lock(&inode->i_mutex); - err = fuse_send_open(inode, file, isdir, &outarg); - if (err) - fuse_file_free(ff); - else { - if (isdir) - outarg.open_flags &= ~FOPEN_DIRECT_IO; - fuse_finish_open(inode, file, ff, &outarg); - } + err = fuse_do_open(fc, get_node_id(inode), file, isdir); + + if (!err) + fuse_finish_open(inode, file); + + if (lock_inode) + mutex_unlock(&inode->i_mutex); return err; } -void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) +static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) { + struct fuse_conn *fc = ff->fc; struct fuse_req *req = ff->reserved_req; struct fuse_release_in *inarg = &req->misc.release.in; + spin_lock(&fc->lock); + list_del(&ff->write_entry); + if (!RB_EMPTY_NODE(&ff->polled_node)) + rb_erase(&ff->polled_node, &fc->polled_files); + spin_unlock(&fc->lock); + + wake_up_interruptible_all(&ff->poll_wait); + inarg->fh = ff->fh; inarg->flags = flags; req->in.h.opcode = opcode; - req->in.h.nodeid = nodeid; + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(struct fuse_release_in); req->in.args[0].value = inarg; } -int fuse_release_common(struct inode *inode, struct file *file, int isdir) +void fuse_release_common(struct file *file, int opcode) { - struct fuse_file *ff = file->private_data; - if (ff) { - struct fuse_conn *fc = get_fuse_conn(inode); - struct fuse_req *req = ff->reserved_req; + struct fuse_file *ff; + struct fuse_req *req; - fuse_release_fill(ff, get_node_id(inode), file->f_flags, - isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); + ff = file->private_data; + if (unlikely(!ff)) + return; - /* Hold vfsmount and dentry until release is finished */ - req->misc.release.vfsmount = mntget(file->f_path.mnt); - req->misc.release.dentry = dget(file->f_path.dentry); + req = ff->reserved_req; + fuse_prepare_release(ff, file->f_flags, opcode); - spin_lock(&fc->lock); - list_del(&ff->write_entry); - spin_unlock(&fc->lock); - /* - * Normally this will send the RELEASE request, - * however if some asynchronous READ or WRITE requests - * are outstanding, the sending will be delayed - */ - fuse_file_put(ff); + if (ff->flock) { + struct fuse_release_in *inarg = &req->misc.release.in; + inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; + inarg->lock_owner = fuse_lock_owner_id(ff->fc, + (fl_owner_t) file); } - - /* Return value is ignored by VFS */ - return 0; + /* Hold vfsmount and dentry until release is finished */ + path_get(&file->f_path); + req->misc.release.path = file->f_path; + + /* + * Normally this will send the RELEASE request, however if + * some asynchronous READ or WRITE requests are outstanding, + * the sending will be delayed. + * + * Make the release synchronous if this is a fuseblk mount, + * synchronous RELEASE is allowed (and desirable) in this case + * because the server can be trusted not to screw up. + */ + fuse_file_put(ff, ff->fc->destroy_req != NULL); } static int fuse_open(struct inode *inode, struct file *file) { - return fuse_open_common(inode, file, 0); + return fuse_open_common(inode, file, false); } static int fuse_release(struct inode *inode, struct file *file) { - return fuse_release_common(inode, file, 0); + struct fuse_conn *fc = get_fuse_conn(inode); + + /* see fuse_vma_close() for !writeback_cache case */ + if (fc->writeback_cache) + write_inode_now(inode, 1); + + fuse_release_common(file, FUSE_RELEASE); + + /* return value is ignored by VFS */ + return 0; +} + +void fuse_sync_release(struct fuse_file *ff, int flags) +{ + WARN_ON(atomic_read(&ff->count) > 1); + fuse_prepare_release(ff, flags, FUSE_RELEASE); + ff->reserved_req->force = 1; + ff->reserved_req->background = 0; + fuse_request_send(ff->fc, ff->reserved_req); + fuse_put_request(ff->fc, ff->reserved_req); + kfree(ff); } +EXPORT_SYMBOL_GPL(fuse_sync_release); /* * Scramble the ID space with XTEA, so that the value of the files_struct @@ -210,9 +366,74 @@ u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) return (u64) v0 + ((u64) v1 << 32); } +/* + * Check if any page in a range is under writeback + * + * This is currently done by walking the list of writepage requests + * for the inode, which can be pretty inefficient. + */ +static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from, + pgoff_t idx_to) +{ + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_req *req; + bool found = false; + + spin_lock(&fc->lock); + list_for_each_entry(req, &fi->writepages, writepages_entry) { + pgoff_t curr_index; + + BUG_ON(req->inode != inode); + curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; + if (idx_from < curr_index + req->num_pages && + curr_index <= idx_to) { + found = true; + break; + } + } + spin_unlock(&fc->lock); + + return found; +} + +static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) +{ + return fuse_range_is_writeback(inode, index, index); +} + +/* + * Wait for page writeback to be completed. + * + * Since fuse doesn't rely on the VM writeback tracking, this has to + * use some other means. + */ +static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) +{ + struct fuse_inode *fi = get_fuse_inode(inode); + + wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); + return 0; +} + +/* + * Wait for all pending writepages on the inode to finish. + * + * This is currently done by blocking further writes with FUSE_NOWRITE + * and waiting for all sent writes to complete. + * + * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage + * could conflict with truncation. + */ +static void fuse_sync_writes(struct inode *inode) +{ + fuse_set_nowrite(inode); + fuse_release_nowrite(inode); +} + static int fuse_flush(struct file *file, fl_owner_t id) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_file *ff = file->private_data; struct fuse_req *req; @@ -225,7 +446,15 @@ static int fuse_flush(struct file *file, fl_owner_t id) if (fc->no_flush) return 0; - req = fuse_get_req_nofail(fc, file); + err = write_inode_now(inode, 1); + if (err) + return err; + + mutex_lock(&inode->i_mutex); + fuse_sync_writes(inode); + mutex_unlock(&inode->i_mutex); + + req = fuse_get_req_nofail_nopages(fc, file); memset(&inarg, 0, sizeof(inarg)); inarg.fh = ff->fh; inarg.lock_owner = fuse_lock_owner_id(fc, id); @@ -235,7 +464,7 @@ static int fuse_flush(struct file *file, fl_owner_t id) req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; req->force = 1; - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; fuse_put_request(fc, req); if (err == -ENOSYS) { @@ -245,10 +474,10 @@ static int fuse_flush(struct file *file, fl_owner_t id) return err; } -int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, - int isdir) +int fuse_fsync_common(struct file *file, loff_t start, loff_t end, + int datasync, int isdir) { - struct inode *inode = de->d_inode; + struct inode *inode = file->f_mapping->host; struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_file *ff = file->private_data; struct fuse_req *req; @@ -258,12 +487,30 @@ int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, if (is_bad_inode(inode)) return -EIO; + mutex_lock(&inode->i_mutex); + + /* + * Start writeback against all dirty pages of the inode, then + * wait for all outstanding writes, before sending the FSYNC + * request. + */ + err = filemap_write_and_wait_range(inode->i_mapping, start, end); + if (err) + goto out; + + fuse_sync_writes(inode); + err = sync_inode_metadata(inode, 1); + if (err) + goto out; + if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) - return 0; + goto out; - req = fuse_get_req(fc); - if (IS_ERR(req)) - return PTR_ERR(req); + req = fuse_get_req_nopages(fc); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } memset(&inarg, 0, sizeof(inarg)); inarg.fh = ff->fh; @@ -273,7 +520,7 @@ int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, req->in.numargs = 1; req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; fuse_put_request(fc, req); if (err == -ENOSYS) { @@ -283,18 +530,21 @@ int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, fc->no_fsync = 1; err = 0; } +out: + mutex_unlock(&inode->i_mutex); return err; } -static int fuse_fsync(struct file *file, struct dentry *de, int datasync) +static int fuse_fsync(struct file *file, loff_t start, loff_t end, + int datasync) { - return fuse_fsync_common(file, de, datasync, 0); + return fuse_fsync_common(file, start, end, datasync, 0); } -void fuse_read_fill(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, int opcode) +void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, + size_t count, int opcode) { - struct fuse_read_in *inarg = &req->misc.read_in; + struct fuse_read_in *inarg = &req->misc.read.in; struct fuse_file *ff = file->private_data; inarg->fh = ff->fh; @@ -302,59 +552,241 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, inarg->size = count; inarg->flags = file->f_flags; req->in.h.opcode = opcode; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(struct fuse_read_in); req->in.args[0].value = inarg; - req->out.argpages = 1; req->out.argvar = 1; req->out.numargs = 1; req->out.args[0].size = count; } -static size_t fuse_send_read(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, - fl_owner_t owner) +static void fuse_release_user_pages(struct fuse_req *req, int write) { - struct fuse_conn *fc = get_fuse_conn(inode); + unsigned i; + + for (i = 0; i < req->num_pages; i++) { + struct page *page = req->pages[i]; + if (write) + set_page_dirty_lock(page); + put_page(page); + } +} + +/** + * In case of short read, the caller sets 'pos' to the position of + * actual end of fuse request in IO request. Otherwise, if bytes_requested + * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1. + * + * An example: + * User requested DIO read of 64K. It was splitted into two 32K fuse requests, + * both submitted asynchronously. The first of them was ACKed by userspace as + * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The + * second request was ACKed as short, e.g. only 1K was read, resulting in + * pos == 33K. + * + * Thus, when all fuse requests are completed, the minimal non-negative 'pos' + * will be equal to the length of the longest contiguous fragment of + * transferred data starting from the beginning of IO request. + */ +static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) +{ + int left; + + spin_lock(&io->lock); + if (err) + io->err = io->err ? : err; + else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes)) + io->bytes = pos; + + left = --io->reqs; + spin_unlock(&io->lock); + + if (!left) { + long res; + + if (io->err) + res = io->err; + else if (io->bytes >= 0 && io->write) + res = -EIO; + else { + res = io->bytes < 0 ? io->size : io->bytes; + + if (!is_sync_kiocb(io->iocb)) { + struct inode *inode = file_inode(io->iocb->ki_filp); + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + + spin_lock(&fc->lock); + fi->attr_version = ++fc->attr_version; + spin_unlock(&fc->lock); + } + } + + aio_complete(io->iocb, res, 0); + kfree(io); + } +} + +static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req) +{ + struct fuse_io_priv *io = req->io; + ssize_t pos = -1; + + fuse_release_user_pages(req, !io->write); + + if (io->write) { + if (req->misc.write.in.size != req->misc.write.out.size) + pos = req->misc.write.in.offset - io->offset + + req->misc.write.out.size; + } else { + if (req->misc.read.in.size != req->out.args[0].size) + pos = req->misc.read.in.offset - io->offset + + req->out.args[0].size; + } + + fuse_aio_complete(io, req->out.h.error, pos); +} - fuse_read_fill(req, file, inode, pos, count, FUSE_READ); +static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req, + size_t num_bytes, struct fuse_io_priv *io) +{ + spin_lock(&io->lock); + io->size += num_bytes; + io->reqs++; + spin_unlock(&io->lock); + + req->io = io; + req->end = fuse_aio_complete_req; + + __fuse_get_request(req); + fuse_request_send_background(fc, req); + + return num_bytes; +} + +static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io, + loff_t pos, size_t count, fl_owner_t owner) +{ + struct file *file = io->file; + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; + + fuse_read_fill(req, file, pos, count, FUSE_READ); if (owner != NULL) { - struct fuse_read_in *inarg = &req->misc.read_in; + struct fuse_read_in *inarg = &req->misc.read.in; inarg->read_flags |= FUSE_READ_LOCKOWNER; inarg->lock_owner = fuse_lock_owner_id(fc, owner); } - request_send(fc, req); + + if (io->async) + return fuse_async_req_send(fc, req, count, io); + + fuse_request_send(fc, req); return req->out.args[0].size; } -static int fuse_readpage(struct file *file, struct page *page) +static void fuse_read_update_size(struct inode *inode, loff_t size, + u64 attr_ver) +{ + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + + spin_lock(&fc->lock); + if (attr_ver == fi->attr_version && size < inode->i_size && + !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { + fi->attr_version = ++fc->attr_version; + i_size_write(inode, size); + } + spin_unlock(&fc->lock); +} + +static void fuse_short_read(struct fuse_req *req, struct inode *inode, + u64 attr_ver) +{ + size_t num_read = req->out.args[0].size; + struct fuse_conn *fc = get_fuse_conn(inode); + + if (fc->writeback_cache) { + /* + * A hole in a file. Some data after the hole are in page cache, + * but have not reached the client fs yet. So, the hole is not + * present there. + */ + int i; + int start_idx = num_read >> PAGE_CACHE_SHIFT; + size_t off = num_read & (PAGE_CACHE_SIZE - 1); + + for (i = start_idx; i < req->num_pages; i++) { + zero_user_segment(req->pages[i], off, PAGE_CACHE_SIZE); + off = 0; + } + } else { + loff_t pos = page_offset(req->pages[0]) + num_read; + fuse_read_update_size(inode, pos, attr_ver); + } +} + +static int fuse_do_readpage(struct file *file, struct page *page) { + struct fuse_io_priv io = { .async = 0, .file = file }; struct inode *inode = page->mapping->host; struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_req *req; + size_t num_read; + loff_t pos = page_offset(page); + size_t count = PAGE_CACHE_SIZE; + u64 attr_ver; int err; - err = -EIO; - if (is_bad_inode(inode)) - goto out; + /* + * Page writeback can extend beyond the lifetime of the + * page-cache page, so make sure we read a properly synced + * page. + */ + fuse_wait_on_page_writeback(inode, page->index); - req = fuse_get_req(fc); - err = PTR_ERR(req); + req = fuse_get_req(fc, 1); if (IS_ERR(req)) - goto out; + return PTR_ERR(req); + + attr_ver = fuse_get_attr_version(fc); req->out.page_zeroing = 1; + req->out.argpages = 1; req->num_pages = 1; req->pages[0] = page; - fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE, - NULL); + req->page_descs[0].length = count; + num_read = fuse_send_read(req, &io, pos, count, NULL); err = req->out.h.error; - fuse_put_request(fc, req); - if (!err) + + if (!err) { + /* + * Short read means EOF. If file size is larger, truncate it + */ + if (num_read < count) + fuse_short_read(req, inode, attr_ver); + SetPageUptodate(page); - fuse_invalidate_attr(inode); /* atime changed */ + } + + fuse_put_request(fc, req); + + return err; +} + +static int fuse_readpage(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + int err; + + err = -EIO; + if (is_bad_inode(inode)) + goto out; + + err = fuse_do_readpage(file, page); + fuse_invalidate_atime(inode); out: unlock_page(page); return err; @@ -363,8 +795,24 @@ static int fuse_readpage(struct file *file, struct page *page) static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) { int i; + size_t count = req->misc.read.in.size; + size_t num_read = req->out.args[0].size; + struct address_space *mapping = NULL; - fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */ + for (i = 0; mapping == NULL && i < req->num_pages; i++) + mapping = req->pages[i]->mapping; + + if (mapping) { + struct inode *inode = mapping->host; + + /* + * Short read means EOF. If file size is larger, truncate it + */ + if (!req->out.h.error && num_read < count) + fuse_short_read(req, inode, req->misc.read.attr_ver); + + fuse_invalidate_atime(inode); + } for (i = 0; i < req->num_pages; i++) { struct page *page = req->pages[i]; @@ -373,28 +821,32 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) else SetPageError(page); unlock_page(page); + page_cache_release(page); } if (req->ff) - fuse_file_put(req->ff); - fuse_put_request(fc, req); + fuse_file_put(req->ff, false); } -static void fuse_send_readpages(struct fuse_req *req, struct file *file, - struct inode *inode) +static void fuse_send_readpages(struct fuse_req *req, struct file *file) { - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; loff_t pos = page_offset(req->pages[0]); size_t count = req->num_pages << PAGE_CACHE_SHIFT; + + req->out.argpages = 1; req->out.page_zeroing = 1; - fuse_read_fill(req, file, inode, pos, count, FUSE_READ); + req->out.page_replace = 1; + fuse_read_fill(req, file, pos, count, FUSE_READ); + req->misc.read.attr_ver = fuse_get_attr_version(fc); if (fc->async_read) { - struct fuse_file *ff = file->private_data; req->ff = fuse_file_get(ff); req->end = fuse_readpages_end; - request_send_background(fc, req); + fuse_request_send_background(fc, req); } else { - request_send(fc, req); + fuse_request_send(fc, req); fuse_readpages_end(fc, req); + fuse_put_request(fc, req); } } @@ -402,6 +854,7 @@ struct fuse_fill_data { struct fuse_req *req; struct file *file; struct inode *inode; + unsigned nr_pages; }; static int fuse_readpages_fill(void *_data, struct page *page) @@ -411,19 +864,37 @@ static int fuse_readpages_fill(void *_data, struct page *page) struct inode *inode = data->inode; struct fuse_conn *fc = get_fuse_conn(inode); + fuse_wait_on_page_writeback(inode, page->index); + if (req->num_pages && (req->num_pages == FUSE_MAX_PAGES_PER_REQ || (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || req->pages[req->num_pages - 1]->index + 1 != page->index)) { - fuse_send_readpages(req, data->file, inode); - data->req = req = fuse_get_req(fc); + int nr_alloc = min_t(unsigned, data->nr_pages, + FUSE_MAX_PAGES_PER_REQ); + fuse_send_readpages(req, data->file); + if (fc->async_read) + req = fuse_get_req_for_background(fc, nr_alloc); + else + req = fuse_get_req(fc, nr_alloc); + + data->req = req; if (IS_ERR(req)) { unlock_page(page); return PTR_ERR(req); } } + + if (WARN_ON(req->num_pages >= req->max_pages)) { + fuse_put_request(fc, req); + return -EIO; + } + + page_cache_get(page); req->pages[req->num_pages] = page; - req->num_pages ++; + req->page_descs[req->num_pages].length = PAGE_SIZE; + req->num_pages++; + data->nr_pages--; return 0; } @@ -434,6 +905,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_fill_data data; int err; + int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ); err = -EIO; if (is_bad_inode(inode)) @@ -441,7 +913,11 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, data.file = file; data.inode = inode; - data.req = fuse_get_req(fc); + if (fc->async_read) + data.req = fuse_get_req_for_background(fc, nr_alloc); + else + data.req = fuse_get_req(fc, nr_alloc); + data.nr_pages = nr_pages; err = PTR_ERR(data.req); if (IS_ERR(data.req)) goto out; @@ -449,7 +925,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); if (!err) { if (data.req->num_pages) - fuse_send_readpages(data.req, file, inode); + fuse_send_readpages(data.req, file); else fuse_put_request(fc, data.req); } @@ -457,45 +933,40 @@ out: return err; } -static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, - unsigned long nr_segs, loff_t pos) +static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct inode *inode = iocb->ki_filp->f_mapping->host; + struct fuse_conn *fc = get_fuse_conn(inode); - if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { + /* + * In auto invalidate mode, always update attributes on read. + * Otherwise, only update if we attempt to read past EOF (to ensure + * i_size is up to date). + */ + if (fc->auto_inval_data || + (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) { int err; - /* - * If trying to read past EOF, make sure the i_size - * attribute is up-to-date. - */ err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); if (err) return err; } - return generic_file_aio_read(iocb, iov, nr_segs, pos); + return generic_file_read_iter(iocb, to); } -static void fuse_write_fill(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, - int writepage) +static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, + loff_t pos, size_t count) { - struct fuse_conn *fc = get_fuse_conn(inode); - struct fuse_file *ff = file->private_data; struct fuse_write_in *inarg = &req->misc.write.in; struct fuse_write_out *outarg = &req->misc.write.out; - memset(inarg, 0, sizeof(struct fuse_write_in)); inarg->fh = ff->fh; inarg->offset = pos; inarg->size = count; - inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0; - inarg->flags = file->f_flags; req->in.h.opcode = FUSE_WRITE; - req->in.h.nodeid = get_node_id(inode); - req->in.argpages = 1; + req->in.h.nodeid = ff->nodeid; req->in.numargs = 2; - if (fc->minor < 9) + if (ff->fc->minor < 9) req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; else req->in.args[0].size = sizeof(struct fuse_write_in); @@ -506,160 +977,417 @@ static void fuse_write_fill(struct fuse_req *req, struct file *file, req->out.args[0].value = outarg; } -static size_t fuse_send_write(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, - fl_owner_t owner) +static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io, + loff_t pos, size_t count, fl_owner_t owner) { - struct fuse_conn *fc = get_fuse_conn(inode); - fuse_write_fill(req, file, inode, pos, count, 0); + struct file *file = io->file; + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; + struct fuse_write_in *inarg = &req->misc.write.in; + + fuse_write_fill(req, ff, pos, count); + inarg->flags = file->f_flags; if (owner != NULL) { - struct fuse_write_in *inarg = &req->misc.write.in; inarg->write_flags |= FUSE_WRITE_LOCKOWNER; inarg->lock_owner = fuse_lock_owner_id(fc, owner); } - request_send(fc, req); + + if (io->async) + return fuse_async_req_send(fc, req, count, io); + + fuse_request_send(fc, req); return req->misc.write.out.size; } -static int fuse_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) +bool fuse_write_update_size(struct inode *inode, loff_t pos) { - pgoff_t index = pos >> PAGE_CACHE_SHIFT; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + bool ret = false; - *pagep = __grab_cache_page(mapping, index); - if (!*pagep) - return -ENOMEM; - return 0; + spin_lock(&fc->lock); + fi->attr_version = ++fc->attr_version; + if (pos > inode->i_size) { + i_size_write(inode, pos); + ret = true; + } + spin_unlock(&fc->lock); + + return ret; +} + +static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, + struct inode *inode, loff_t pos, + size_t count) +{ + size_t res; + unsigned offset; + unsigned i; + struct fuse_io_priv io = { .async = 0, .file = file }; + + for (i = 0; i < req->num_pages; i++) + fuse_wait_on_page_writeback(inode, req->pages[i]->index); + + res = fuse_send_write(req, &io, pos, count, NULL); + + offset = req->page_descs[0].offset; + count = res; + for (i = 0; i < req->num_pages; i++) { + struct page *page = req->pages[i]; + + if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) + SetPageUptodate(page); + + if (count > PAGE_CACHE_SIZE - offset) + count -= PAGE_CACHE_SIZE - offset; + else + count = 0; + offset = 0; + + unlock_page(page); + page_cache_release(page); + } + + return res; } -static int fuse_buffered_write(struct file *file, struct inode *inode, - loff_t pos, unsigned count, struct page *page) +static ssize_t fuse_fill_write_pages(struct fuse_req *req, + struct address_space *mapping, + struct iov_iter *ii, loff_t pos) { + struct fuse_conn *fc = get_fuse_conn(mapping->host); + unsigned offset = pos & (PAGE_CACHE_SIZE - 1); + size_t count = 0; int err; - size_t nres; + + req->in.argpages = 1; + req->page_descs[0].offset = offset; + + do { + size_t tmp; + struct page *page; + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, + iov_iter_count(ii)); + + bytes = min_t(size_t, bytes, fc->max_write - count); + + again: + err = -EFAULT; + if (iov_iter_fault_in_readable(ii, bytes)) + break; + + err = -ENOMEM; + page = grab_cache_page_write_begin(mapping, index, 0); + if (!page) + break; + + if (mapping_writably_mapped(mapping)) + flush_dcache_page(page); + + tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); + flush_dcache_page(page); + + if (!tmp) { + unlock_page(page); + page_cache_release(page); + bytes = min(bytes, iov_iter_single_seg_count(ii)); + goto again; + } + + err = 0; + req->pages[req->num_pages] = page; + req->page_descs[req->num_pages].length = tmp; + req->num_pages++; + + iov_iter_advance(ii, tmp); + count += tmp; + pos += tmp; + offset += tmp; + if (offset == PAGE_CACHE_SIZE) + offset = 0; + + if (!fc->big_writes) + break; + } while (iov_iter_count(ii) && count < fc->max_write && + req->num_pages < req->max_pages && offset == 0); + + return count > 0 ? count : err; +} + +static inline unsigned fuse_wr_pages(loff_t pos, size_t len) +{ + return min_t(unsigned, + ((pos + len - 1) >> PAGE_CACHE_SHIFT) - + (pos >> PAGE_CACHE_SHIFT) + 1, + FUSE_MAX_PAGES_PER_REQ); +} + +static ssize_t fuse_perform_write(struct file *file, + struct address_space *mapping, + struct iov_iter *ii, loff_t pos) +{ + struct inode *inode = mapping->host; struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_inode *fi = get_fuse_inode(inode); - unsigned offset = pos & (PAGE_CACHE_SIZE - 1); - struct fuse_req *req; + int err = 0; + ssize_t res = 0; if (is_bad_inode(inode)) return -EIO; - req = fuse_get_req(fc); - if (IS_ERR(req)) - return PTR_ERR(req); + if (inode->i_size < pos + iov_iter_count(ii)) + set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); - req->num_pages = 1; - req->pages[0] = page; - req->page_offset = offset; - nres = fuse_send_write(req, file, inode, pos, count, NULL); - err = req->out.h.error; - fuse_put_request(fc, req); - if (!err && !nres) - err = -EIO; - if (!err) { - pos += nres; - spin_lock(&fc->lock); - fi->attr_version = ++fc->attr_version; - if (pos > inode->i_size) - i_size_write(inode, pos); - spin_unlock(&fc->lock); + do { + struct fuse_req *req; + ssize_t count; + unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii)); - if (count == PAGE_CACHE_SIZE) - SetPageUptodate(page); - } + req = fuse_get_req(fc, nr_pages); + if (IS_ERR(req)) { + err = PTR_ERR(req); + break; + } + + count = fuse_fill_write_pages(req, mapping, ii, pos); + if (count <= 0) { + err = count; + } else { + size_t num_written; + + num_written = fuse_send_write_pages(req, file, inode, + pos, count); + err = req->out.h.error; + if (!err) { + res += num_written; + pos += num_written; + + /* break out of the loop on short write */ + if (num_written != count) + err = -EIO; + } + } + fuse_put_request(fc, req); + } while (!err && iov_iter_count(ii)); + + if (res > 0) + fuse_write_update_size(inode, pos); + + clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); fuse_invalidate_attr(inode); - return err ? err : nres; + + return res > 0 ? res : err; } -static int fuse_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata) +static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { + struct file *file = iocb->ki_filp; + struct address_space *mapping = file->f_mapping; + size_t count = iov_iter_count(from); + ssize_t written = 0; + ssize_t written_buffered = 0; struct inode *inode = mapping->host; - int res = 0; + ssize_t err; + loff_t endbyte = 0; + loff_t pos = iocb->ki_pos; - if (copied) - res = fuse_buffered_write(file, inode, pos, copied, page); + if (get_fuse_conn(inode)->writeback_cache) { + /* Update size (EOF optimization) and mode (SUID clearing) */ + err = fuse_update_attributes(mapping->host, NULL, file, NULL); + if (err) + return err; - unlock_page(page); - page_cache_release(page); - return res; + return generic_file_write_iter(iocb, from); + } + + mutex_lock(&inode->i_mutex); + + /* We can write back this queue in page reclaim */ + current->backing_dev_info = mapping->backing_dev_info; + + err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); + if (err) + goto out; + + if (count == 0) + goto out; + + iov_iter_truncate(from, count); + err = file_remove_suid(file); + if (err) + goto out; + + err = file_update_time(file); + if (err) + goto out; + + if (file->f_flags & O_DIRECT) { + written = generic_file_direct_write(iocb, from, pos); + if (written < 0 || !iov_iter_count(from)) + goto out; + + pos += written; + + written_buffered = fuse_perform_write(file, mapping, from, pos); + if (written_buffered < 0) { + err = written_buffered; + goto out; + } + endbyte = pos + written_buffered - 1; + + err = filemap_write_and_wait_range(file->f_mapping, pos, + endbyte); + if (err) + goto out; + + invalidate_mapping_pages(file->f_mapping, + pos >> PAGE_CACHE_SHIFT, + endbyte >> PAGE_CACHE_SHIFT); + + written += written_buffered; + iocb->ki_pos = pos + written_buffered; + } else { + written = fuse_perform_write(file, mapping, from, pos); + if (written >= 0) + iocb->ki_pos = pos + written; + } +out: + current->backing_dev_info = NULL; + mutex_unlock(&inode->i_mutex); + + return written ? written : err; } -static void fuse_release_user_pages(struct fuse_req *req, int write) +static inline void fuse_page_descs_length_init(struct fuse_req *req, + unsigned index, unsigned nr_pages) { - unsigned i; + int i; - for (i = 0; i < req->num_pages; i++) { - struct page *page = req->pages[i]; - if (write) - set_page_dirty_lock(page); - put_page(page); - } + for (i = index; i < index + nr_pages; i++) + req->page_descs[i].length = PAGE_SIZE - + req->page_descs[i].offset; +} + +static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii) +{ + return (unsigned long)ii->iov->iov_base + ii->iov_offset; } -static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, - unsigned nbytes, int write) +static inline size_t fuse_get_frag_size(const struct iov_iter *ii, + size_t max_size) { - unsigned long user_addr = (unsigned long) buf; - unsigned offset = user_addr & ~PAGE_MASK; - int npages; + return min(iov_iter_single_seg_count(ii), max_size); +} + +static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, + size_t *nbytesp, int write) +{ + size_t nbytes = 0; /* # bytes already packed in req */ + + /* Special case for kernel I/O: can copy directly into the buffer */ + if (ii->type & ITER_KVEC) { + unsigned long user_addr = fuse_get_user_addr(ii); + size_t frag_size = fuse_get_frag_size(ii, *nbytesp); + + if (write) + req->in.args[1].value = (void *) user_addr; + else + req->out.args[0].value = (void *) user_addr; + + iov_iter_advance(ii, frag_size); + *nbytesp = frag_size; + return 0; + } + + while (nbytes < *nbytesp && req->num_pages < req->max_pages) { + unsigned npages; + size_t start; + unsigned n = req->max_pages - req->num_pages; + ssize_t ret = iov_iter_get_pages(ii, + &req->pages[req->num_pages], + n * PAGE_SIZE, &start); + if (ret < 0) + return ret; + + iov_iter_advance(ii, ret); + nbytes += ret; + + ret += start; + npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; - /* This doesn't work with nfsd */ - if (!current->mm) - return -EPERM; + req->page_descs[req->num_pages].offset = start; + fuse_page_descs_length_init(req, req->num_pages, npages); + + req->num_pages += npages; + req->page_descs[req->num_pages - 1].length -= + (PAGE_SIZE - ret) & (PAGE_SIZE - 1); + } + + if (write) + req->in.argpages = 1; + else + req->out.argpages = 1; - nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); - npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; - npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ); - down_read(¤t->mm->mmap_sem); - npages = get_user_pages(current, current->mm, user_addr, npages, write, - 0, req->pages, NULL); - up_read(¤t->mm->mmap_sem); - if (npages < 0) - return npages; + *nbytesp = nbytes; - req->num_pages = npages; - req->page_offset = offset; return 0; } -static ssize_t fuse_direct_io(struct file *file, const char __user *buf, - size_t count, loff_t *ppos, int write) +static inline int fuse_iter_npages(const struct iov_iter *ii_p) { - struct inode *inode = file->f_path.dentry->d_inode; - struct fuse_conn *fc = get_fuse_conn(inode); + return iov_iter_npages(ii_p, FUSE_MAX_PAGES_PER_REQ); +} + +ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, + loff_t *ppos, int flags) +{ + int write = flags & FUSE_DIO_WRITE; + int cuse = flags & FUSE_DIO_CUSE; + struct file *file = io->file; + struct inode *inode = file->f_mapping->host; + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; size_t nmax = write ? fc->max_write : fc->max_read; loff_t pos = *ppos; + size_t count = iov_iter_count(iter); + pgoff_t idx_from = pos >> PAGE_CACHE_SHIFT; + pgoff_t idx_to = (pos + count - 1) >> PAGE_CACHE_SHIFT; ssize_t res = 0; struct fuse_req *req; - if (is_bad_inode(inode)) - return -EIO; - - req = fuse_get_req(fc); + if (io->async) + req = fuse_get_req_for_background(fc, fuse_iter_npages(iter)); + else + req = fuse_get_req(fc, fuse_iter_npages(iter)); if (IS_ERR(req)) return PTR_ERR(req); + if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { + if (!write) + mutex_lock(&inode->i_mutex); + fuse_sync_writes(inode); + if (!write) + mutex_unlock(&inode->i_mutex); + } + while (count) { size_t nres; + fl_owner_t owner = current->files; size_t nbytes = min(count, nmax); - int err = fuse_get_user_pages(req, buf, nbytes, !write); + int err = fuse_get_user_pages(req, iter, &nbytes, write); if (err) { res = err; break; } - nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; - nbytes = min(count, nbytes); + if (write) - nres = fuse_send_write(req, file, inode, pos, nbytes, - current->files); + nres = fuse_send_write(req, io, pos, nbytes, owner); else - nres = fuse_send_read(req, file, inode, pos, nbytes, - current->files); - fuse_release_user_pages(req, !write); + nres = fuse_send_read(req, io, pos, nbytes, owner); + + if (!io->async) + fuse_release_user_pages(req, !write); if (req->out.h.error) { if (!res) res = req->out.h.error; @@ -671,26 +1399,41 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, count -= nres; res += nres; pos += nres; - buf += nres; if (nres != nbytes) break; if (count) { fuse_put_request(fc, req); - req = fuse_get_req(fc); + if (io->async) + req = fuse_get_req_for_background(fc, + fuse_iter_npages(iter)); + else + req = fuse_get_req(fc, fuse_iter_npages(iter)); if (IS_ERR(req)) break; } } - fuse_put_request(fc, req); - if (res > 0) { - if (write) { - spin_lock(&fc->lock); - if (pos > inode->i_size) - i_size_write(inode, pos); - spin_unlock(&fc->lock); - } + if (!IS_ERR(req)) + fuse_put_request(fc, req); + if (res > 0) *ppos = pos; - } + + return res; +} +EXPORT_SYMBOL_GPL(fuse_direct_io); + +static ssize_t __fuse_direct_read(struct fuse_io_priv *io, + struct iov_iter *iter, + loff_t *ppos) +{ + ssize_t res; + struct file *file = io->file; + struct inode *inode = file_inode(file); + + if (is_bad_inode(inode)) + return -EIO; + + res = fuse_direct_io(io, iter, ppos, 0); + fuse_invalidate_attr(inode); return res; @@ -699,41 +1442,694 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, static ssize_t fuse_direct_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - return fuse_direct_io(file, buf, count, ppos, 0); + struct fuse_io_priv io = { .async = 0, .file = file }; + struct iovec iov = { .iov_base = buf, .iov_len = count }; + struct iov_iter ii; + iov_iter_init(&ii, READ, &iov, 1, count); + return __fuse_direct_read(&io, &ii, ppos); +} + +static ssize_t __fuse_direct_write(struct fuse_io_priv *io, + struct iov_iter *iter, + loff_t *ppos) +{ + struct file *file = io->file; + struct inode *inode = file_inode(file); + size_t count = iov_iter_count(iter); + ssize_t res; + + + res = generic_write_checks(file, ppos, &count, 0); + if (!res) { + iov_iter_truncate(iter, count); + res = fuse_direct_io(io, iter, ppos, FUSE_DIO_WRITE); + } + + fuse_invalidate_attr(inode); + + return res; } static ssize_t fuse_direct_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct inode *inode = file->f_path.dentry->d_inode; + struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count }; + struct inode *inode = file_inode(file); ssize_t res; + struct fuse_io_priv io = { .async = 0, .file = file }; + struct iov_iter ii; + iov_iter_init(&ii, WRITE, &iov, 1, count); + + if (is_bad_inode(inode)) + return -EIO; + /* Don't allow parallel writes to the same file */ mutex_lock(&inode->i_mutex); - res = generic_write_checks(file, ppos, &count, 0); - if (!res) - res = fuse_direct_io(file, buf, count, ppos, 1); + res = __fuse_direct_write(&io, &ii, ppos); + if (res > 0) + fuse_write_update_size(inode, *ppos); mutex_unlock(&inode->i_mutex); + return res; } -static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) +static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) { - if ((vma->vm_flags & VM_SHARED)) { - if ((vma->vm_flags & VM_WRITE)) - return -ENODEV; - else - vma->vm_flags &= ~VM_MAYWRITE; + int i; + + for (i = 0; i < req->num_pages; i++) + __free_page(req->pages[i]); + + if (req->ff) + fuse_file_put(req->ff, false); +} + +static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) +{ + struct inode *inode = req->inode; + struct fuse_inode *fi = get_fuse_inode(inode); + struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; + int i; + + list_del(&req->writepages_entry); + for (i = 0; i < req->num_pages; i++) { + dec_bdi_stat(bdi, BDI_WRITEBACK); + dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP); + bdi_writeout_inc(bdi); } - return generic_file_mmap(file, vma); + wake_up(&fi->page_waitq); +} + +/* Called under fc->lock, may release and reacquire it */ +static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req, + loff_t size) +__releases(fc->lock) +__acquires(fc->lock) +{ + struct fuse_inode *fi = get_fuse_inode(req->inode); + struct fuse_write_in *inarg = &req->misc.write.in; + __u64 data_size = req->num_pages * PAGE_CACHE_SIZE; + + if (!fc->connected) + goto out_free; + + if (inarg->offset + data_size <= size) { + inarg->size = data_size; + } else if (inarg->offset < size) { + inarg->size = size - inarg->offset; + } else { + /* Got truncated off completely */ + goto out_free; + } + + req->in.args[1].size = inarg->size; + fi->writectr++; + fuse_request_send_background_locked(fc, req); + return; + + out_free: + fuse_writepage_finish(fc, req); + spin_unlock(&fc->lock); + fuse_writepage_free(fc, req); + fuse_put_request(fc, req); + spin_lock(&fc->lock); +} + +/* + * If fi->writectr is positive (no truncate or fsync going on) send + * all queued writepage requests. + * + * Called with fc->lock + */ +void fuse_flush_writepages(struct inode *inode) +__releases(fc->lock) +__acquires(fc->lock) +{ + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + size_t crop = i_size_read(inode); + struct fuse_req *req; + + while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { + req = list_entry(fi->queued_writes.next, struct fuse_req, list); + list_del_init(&req->list); + fuse_send_writepage(fc, req, crop); + } +} + +static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) +{ + struct inode *inode = req->inode; + struct fuse_inode *fi = get_fuse_inode(inode); + + mapping_set_error(inode->i_mapping, req->out.h.error); + spin_lock(&fc->lock); + while (req->misc.write.next) { + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_write_in *inarg = &req->misc.write.in; + struct fuse_req *next = req->misc.write.next; + req->misc.write.next = next->misc.write.next; + next->misc.write.next = NULL; + next->ff = fuse_file_get(req->ff); + list_add(&next->writepages_entry, &fi->writepages); + + /* + * Skip fuse_flush_writepages() to make it easy to crop requests + * based on primary request size. + * + * 1st case (trivial): there are no concurrent activities using + * fuse_set/release_nowrite. Then we're on safe side because + * fuse_flush_writepages() would call fuse_send_writepage() + * anyway. + * + * 2nd case: someone called fuse_set_nowrite and it is waiting + * now for completion of all in-flight requests. This happens + * rarely and no more than once per page, so this should be + * okay. + * + * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle + * of fuse_set_nowrite..fuse_release_nowrite section. The fact + * that fuse_set_nowrite returned implies that all in-flight + * requests were completed along with all of their secondary + * requests. Further primary requests are blocked by negative + * writectr. Hence there cannot be any in-flight requests and + * no invocations of fuse_writepage_end() while we're in + * fuse_set_nowrite..fuse_release_nowrite section. + */ + fuse_send_writepage(fc, next, inarg->offset + inarg->size); + } + fi->writectr--; + fuse_writepage_finish(fc, req); + spin_unlock(&fc->lock); + fuse_writepage_free(fc, req); +} + +static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc, + struct fuse_inode *fi) +{ + struct fuse_file *ff = NULL; + + spin_lock(&fc->lock); + if (!list_empty(&fi->write_files)) { + ff = list_entry(fi->write_files.next, struct fuse_file, + write_entry); + fuse_file_get(ff); + } + spin_unlock(&fc->lock); + + return ff; +} + +static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc, + struct fuse_inode *fi) +{ + struct fuse_file *ff = __fuse_write_file_get(fc, fi); + WARN_ON(!ff); + return ff; +} + +int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_file *ff; + int err; + + ff = __fuse_write_file_get(fc, fi); + err = fuse_flush_times(inode, ff); + if (ff) + fuse_file_put(ff, 0); + + return err; +} + +static int fuse_writepage_locked(struct page *page) +{ + struct address_space *mapping = page->mapping; + struct inode *inode = mapping->host; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_req *req; + struct page *tmp_page; + int error = -ENOMEM; + + set_page_writeback(page); + + req = fuse_request_alloc_nofs(1); + if (!req) + goto err; + + req->background = 1; /* writeback always goes to bg_queue */ + tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); + if (!tmp_page) + goto err_free; + + error = -EIO; + req->ff = fuse_write_file_get(fc, fi); + if (!req->ff) + goto err_nofile; + + fuse_write_fill(req, req->ff, page_offset(page), 0); + + copy_highpage(tmp_page, page); + req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; + req->misc.write.next = NULL; + req->in.argpages = 1; + req->num_pages = 1; + req->pages[0] = tmp_page; + req->page_descs[0].offset = 0; + req->page_descs[0].length = PAGE_SIZE; + req->end = fuse_writepage_end; + req->inode = inode; + + inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); + inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); + + spin_lock(&fc->lock); + list_add(&req->writepages_entry, &fi->writepages); + list_add_tail(&req->list, &fi->queued_writes); + fuse_flush_writepages(inode); + spin_unlock(&fc->lock); + + end_page_writeback(page); + + return 0; + +err_nofile: + __free_page(tmp_page); +err_free: + fuse_request_free(req); +err: + end_page_writeback(page); + return error; +} + +static int fuse_writepage(struct page *page, struct writeback_control *wbc) +{ + int err; + + if (fuse_page_is_writeback(page->mapping->host, page->index)) { + /* + * ->writepages() should be called for sync() and friends. We + * should only get here on direct reclaim and then we are + * allowed to skip a page which is already in flight + */ + WARN_ON(wbc->sync_mode == WB_SYNC_ALL); + + redirty_page_for_writepage(wbc, page); + return 0; + } + + err = fuse_writepage_locked(page); + unlock_page(page); + + return err; +} + +struct fuse_fill_wb_data { + struct fuse_req *req; + struct fuse_file *ff; + struct inode *inode; + struct page **orig_pages; +}; + +static void fuse_writepages_send(struct fuse_fill_wb_data *data) +{ + struct fuse_req *req = data->req; + struct inode *inode = data->inode; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + int num_pages = req->num_pages; + int i; + + req->ff = fuse_file_get(data->ff); + spin_lock(&fc->lock); + list_add_tail(&req->list, &fi->queued_writes); + fuse_flush_writepages(inode); + spin_unlock(&fc->lock); + + for (i = 0; i < num_pages; i++) + end_page_writeback(data->orig_pages[i]); +} + +static bool fuse_writepage_in_flight(struct fuse_req *new_req, + struct page *page) +{ + struct fuse_conn *fc = get_fuse_conn(new_req->inode); + struct fuse_inode *fi = get_fuse_inode(new_req->inode); + struct fuse_req *tmp; + struct fuse_req *old_req; + bool found = false; + pgoff_t curr_index; + + BUG_ON(new_req->num_pages != 0); + + spin_lock(&fc->lock); + list_del(&new_req->writepages_entry); + list_for_each_entry(old_req, &fi->writepages, writepages_entry) { + BUG_ON(old_req->inode != new_req->inode); + curr_index = old_req->misc.write.in.offset >> PAGE_CACHE_SHIFT; + if (curr_index <= page->index && + page->index < curr_index + old_req->num_pages) { + found = true; + break; + } + } + if (!found) { + list_add(&new_req->writepages_entry, &fi->writepages); + goto out_unlock; + } + + new_req->num_pages = 1; + for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) { + BUG_ON(tmp->inode != new_req->inode); + curr_index = tmp->misc.write.in.offset >> PAGE_CACHE_SHIFT; + if (tmp->num_pages == 1 && + curr_index == page->index) { + old_req = tmp; + } + } + + if (old_req->num_pages == 1 && (old_req->state == FUSE_REQ_INIT || + old_req->state == FUSE_REQ_PENDING)) { + struct backing_dev_info *bdi = page->mapping->backing_dev_info; + + copy_highpage(old_req->pages[0], page); + spin_unlock(&fc->lock); + + dec_bdi_stat(bdi, BDI_WRITEBACK); + dec_zone_page_state(page, NR_WRITEBACK_TEMP); + bdi_writeout_inc(bdi); + fuse_writepage_free(fc, new_req); + fuse_request_free(new_req); + goto out; + } else { + new_req->misc.write.next = old_req->misc.write.next; + old_req->misc.write.next = new_req; + } +out_unlock: + spin_unlock(&fc->lock); +out: + return found; +} + +static int fuse_writepages_fill(struct page *page, + struct writeback_control *wbc, void *_data) +{ + struct fuse_fill_wb_data *data = _data; + struct fuse_req *req = data->req; + struct inode *inode = data->inode; + struct fuse_conn *fc = get_fuse_conn(inode); + struct page *tmp_page; + bool is_writeback; + int err; + + if (!data->ff) { + err = -EIO; + data->ff = fuse_write_file_get(fc, get_fuse_inode(inode)); + if (!data->ff) + goto out_unlock; + } + + /* + * Being under writeback is unlikely but possible. For example direct + * read to an mmaped fuse file will set the page dirty twice; once when + * the pages are faulted with get_user_pages(), and then after the read + * completed. + */ + is_writeback = fuse_page_is_writeback(inode, page->index); + + if (req && req->num_pages && + (is_writeback || req->num_pages == FUSE_MAX_PAGES_PER_REQ || + (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_write || + data->orig_pages[req->num_pages - 1]->index + 1 != page->index)) { + fuse_writepages_send(data); + data->req = NULL; + } + err = -ENOMEM; + tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); + if (!tmp_page) + goto out_unlock; + + /* + * The page must not be redirtied until the writeout is completed + * (i.e. userspace has sent a reply to the write request). Otherwise + * there could be more than one temporary page instance for each real + * page. + * + * This is ensured by holding the page lock in page_mkwrite() while + * checking fuse_page_is_writeback(). We already hold the page lock + * since clear_page_dirty_for_io() and keep it held until we add the + * request to the fi->writepages list and increment req->num_pages. + * After this fuse_page_is_writeback() will indicate that the page is + * under writeback, so we can release the page lock. + */ + if (data->req == NULL) { + struct fuse_inode *fi = get_fuse_inode(inode); + + err = -ENOMEM; + req = fuse_request_alloc_nofs(FUSE_MAX_PAGES_PER_REQ); + if (!req) { + __free_page(tmp_page); + goto out_unlock; + } + + fuse_write_fill(req, data->ff, page_offset(page), 0); + req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; + req->misc.write.next = NULL; + req->in.argpages = 1; + req->background = 1; + req->num_pages = 0; + req->end = fuse_writepage_end; + req->inode = inode; + + spin_lock(&fc->lock); + list_add(&req->writepages_entry, &fi->writepages); + spin_unlock(&fc->lock); + + data->req = req; + } + set_page_writeback(page); + + copy_highpage(tmp_page, page); + req->pages[req->num_pages] = tmp_page; + req->page_descs[req->num_pages].offset = 0; + req->page_descs[req->num_pages].length = PAGE_SIZE; + + inc_bdi_stat(page->mapping->backing_dev_info, BDI_WRITEBACK); + inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); + + err = 0; + if (is_writeback && fuse_writepage_in_flight(req, page)) { + end_page_writeback(page); + data->req = NULL; + goto out_unlock; + } + data->orig_pages[req->num_pages] = page; + + /* + * Protected by fc->lock against concurrent access by + * fuse_page_is_writeback(). + */ + spin_lock(&fc->lock); + req->num_pages++; + spin_unlock(&fc->lock); + +out_unlock: + unlock_page(page); + + return err; +} + +static int fuse_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + struct inode *inode = mapping->host; + struct fuse_fill_wb_data data; + int err; + + err = -EIO; + if (is_bad_inode(inode)) + goto out; + + data.inode = inode; + data.req = NULL; + data.ff = NULL; + + err = -ENOMEM; + data.orig_pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, + sizeof(struct page *), + GFP_NOFS); + if (!data.orig_pages) + goto out; + + err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data); + if (data.req) { + /* Ignore errors if we can write at least one page */ + BUG_ON(!data.req->num_pages); + fuse_writepages_send(&data); + err = 0; + } + if (data.ff) + fuse_file_put(data.ff, false); + + kfree(data.orig_pages); +out: + return err; +} + +/* + * It's worthy to make sure that space is reserved on disk for the write, + * but how to implement it without killing performance need more thinking. + */ +static int fuse_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + struct fuse_conn *fc = get_fuse_conn(file->f_dentry->d_inode); + struct page *page; + loff_t fsize; + int err = -ENOMEM; + + WARN_ON(!fc->writeback_cache); + + page = grab_cache_page_write_begin(mapping, index, flags); + if (!page) + goto error; + + fuse_wait_on_page_writeback(mapping->host, page->index); + + if (PageUptodate(page) || len == PAGE_CACHE_SIZE) + goto success; + /* + * Check if the start this page comes after the end of file, in which + * case the readpage can be optimized away. + */ + fsize = i_size_read(mapping->host); + if (fsize <= (pos & PAGE_CACHE_MASK)) { + size_t off = pos & ~PAGE_CACHE_MASK; + if (off) + zero_user_segment(page, 0, off); + goto success; + } + err = fuse_do_readpage(file, page); + if (err) + goto cleanup; +success: + *pagep = page; + return 0; + +cleanup: + unlock_page(page); + page_cache_release(page); +error: + return err; +} + +static int fuse_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + struct inode *inode = page->mapping->host; + + if (!PageUptodate(page)) { + /* Zero any unwritten bytes at the end of the page */ + size_t endoff = (pos + copied) & ~PAGE_CACHE_MASK; + if (endoff) + zero_user_segment(page, endoff, PAGE_CACHE_SIZE); + SetPageUptodate(page); + } + + fuse_write_update_size(inode, pos + copied); + set_page_dirty(page); + unlock_page(page); + page_cache_release(page); + + return copied; +} + +static int fuse_launder_page(struct page *page) +{ + int err = 0; + if (clear_page_dirty_for_io(page)) { + struct inode *inode = page->mapping->host; + err = fuse_writepage_locked(page); + if (!err) + fuse_wait_on_page_writeback(inode, page->index); + } + return err; +} + +/* + * Write back dirty pages now, because there may not be any suitable + * open files later + */ +static void fuse_vma_close(struct vm_area_struct *vma) +{ + filemap_write_and_wait(vma->vm_file->f_mapping); } -static int fuse_set_page_dirty(struct page *page) +/* + * Wait for writeback against this page to complete before allowing it + * to be marked dirty again, and hence written back again, possibly + * before the previous writepage completed. + * + * Block here, instead of in ->writepage(), so that the userspace fs + * can only block processes actually operating on the filesystem. + * + * Otherwise unprivileged userspace fs would be able to block + * unrelated: + * + * - page migration + * - sync(2) + * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER + */ +static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) { - printk("fuse_set_page_dirty: should not happen\n"); - dump_stack(); + struct page *page = vmf->page; + struct inode *inode = file_inode(vma->vm_file); + + file_update_time(vma->vm_file); + lock_page(page); + if (page->mapping != inode->i_mapping) { + unlock_page(page); + return VM_FAULT_NOPAGE; + } + + fuse_wait_on_page_writeback(inode, page->index); + return VM_FAULT_LOCKED; +} + +static const struct vm_operations_struct fuse_file_vm_ops = { + .close = fuse_vma_close, + .fault = filemap_fault, + .map_pages = filemap_map_pages, + .page_mkwrite = fuse_page_mkwrite, + .remap_pages = generic_file_remap_pages, +}; + +static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) +{ + if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) + fuse_link_write_file(file); + + file_accessed(file); + vma->vm_ops = &fuse_file_vm_ops; return 0; } +static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) +{ + /* Can't provide the coherency needed for MAP_SHARED */ + if (vma->vm_flags & VM_MAYSHARE) + return -ENODEV; + + invalidate_inode_pages2(file->f_mapping); + + return generic_file_mmap(file, vma); +} + static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, struct file_lock *fl) { @@ -763,7 +2159,7 @@ static void fuse_lk_fill(struct fuse_req *req, struct file *file, const struct file_lock *fl, int opcode, pid_t pid, int flock) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_file *ff = file->private_data; struct fuse_lk_in *arg = &req->misc.lk_in; @@ -785,13 +2181,13 @@ static void fuse_lk_fill(struct fuse_req *req, struct file *file, static int fuse_getlk(struct file *file, struct file_lock *fl) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_req *req; struct fuse_lk_out outarg; int err; - req = fuse_get_req(fc); + req = fuse_get_req_nopages(fc); if (IS_ERR(req)) return PTR_ERR(req); @@ -799,7 +2195,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl) req->out.numargs = 1; req->out.args[0].size = sizeof(outarg); req->out.args[0].value = &outarg; - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; fuse_put_request(fc, req); if (!err) @@ -810,23 +2206,28 @@ static int fuse_getlk(struct file *file, struct file_lock *fl) static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_req *req; int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; int err; + if (fl->fl_lmops && fl->fl_lmops->lm_grant) { + /* NLM needs asynchronous locks, which we don't support yet */ + return -ENOLCK; + } + /* Unlock on close is handled by the flush method */ if (fl->fl_flags & FL_CLOSE) return 0; - req = fuse_get_req(fc); + req = fuse_get_req_nopages(fc); if (IS_ERR(req)) return PTR_ERR(req); fuse_lk_fill(req, file, fl, opcode, pid, flock); - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; /* locking is restartable */ if (err == -EINTR) @@ -837,11 +2238,13 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); int err; - if (cmd == F_GETLK) { + if (cmd == F_CANCELLK) { + err = 0; + } else if (cmd == F_GETLK) { if (fc->no_lock) { posix_test_lock(file, fl); err = 0; @@ -849,7 +2252,7 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) err = fuse_getlk(file, fl); } else { if (fc->no_lock) - err = posix_lock_file_wait(file, fl); + err = posix_lock_file(file, fl, NULL); else err = fuse_setlk(file, fl, 0); } @@ -858,15 +2261,17 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct fuse_conn *fc = get_fuse_conn(inode); int err; - if (fc->no_lock) { + if (fc->no_flock) { err = flock_lock_file_wait(file, fl); } else { + struct fuse_file *ff = file->private_data; + /* emulate flock with POSIX locks */ - fl->fl_owner = (fl_owner_t) file; + ff->flock = true; err = fuse_setlk(file, fl, 1); } @@ -885,7 +2290,7 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block) if (!inode->i_sb->s_bdev || fc->no_bmap) return 0; - req = fuse_get_req(fc); + req = fuse_get_req_nopages(fc); if (IS_ERR(req)) return 0; @@ -900,7 +2305,7 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block) req->out.numargs = 1; req->out.args[0].size = sizeof(outarg); req->out.args[0].value = &outarg; - request_send(fc, req); + fuse_request_send(fc, req); err = req->out.h.error; fuse_put_request(fc, req); if (err == -ENOSYS) @@ -909,12 +2314,727 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block) return err ? 0 : outarg.block; } +static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) +{ + loff_t retval; + struct inode *inode = file_inode(file); + + /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ + if (whence == SEEK_CUR || whence == SEEK_SET) + return generic_file_llseek(file, offset, whence); + + mutex_lock(&inode->i_mutex); + retval = fuse_update_attributes(inode, NULL, file, NULL); + if (!retval) + retval = generic_file_llseek(file, offset, whence); + mutex_unlock(&inode->i_mutex); + + return retval; +} + +static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, + unsigned int nr_segs, size_t bytes, bool to_user) +{ + struct iov_iter ii; + int page_idx = 0; + + if (!bytes) + return 0; + + iov_iter_init(&ii, to_user ? READ : WRITE, iov, nr_segs, bytes); + + while (iov_iter_count(&ii)) { + struct page *page = pages[page_idx++]; + size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); + void *kaddr; + + kaddr = kmap(page); + + while (todo) { + char __user *uaddr = ii.iov->iov_base + ii.iov_offset; + size_t iov_len = ii.iov->iov_len - ii.iov_offset; + size_t copy = min(todo, iov_len); + size_t left; + + if (!to_user) + left = copy_from_user(kaddr, uaddr, copy); + else + left = copy_to_user(uaddr, kaddr, copy); + + if (unlikely(left)) + return -EFAULT; + + iov_iter_advance(&ii, copy); + todo -= copy; + kaddr += copy; + } + + kunmap(page); + } + + return 0; +} + +/* + * CUSE servers compiled on 32bit broke on 64bit kernels because the + * ABI was defined to be 'struct iovec' which is different on 32bit + * and 64bit. Fortunately we can determine which structure the server + * used from the size of the reply. + */ +static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, + size_t transferred, unsigned count, + bool is_compat) +{ +#ifdef CONFIG_COMPAT + if (count * sizeof(struct compat_iovec) == transferred) { + struct compat_iovec *ciov = src; + unsigned i; + + /* + * With this interface a 32bit server cannot support + * non-compat (i.e. ones coming from 64bit apps) ioctl + * requests + */ + if (!is_compat) + return -EINVAL; + + for (i = 0; i < count; i++) { + dst[i].iov_base = compat_ptr(ciov[i].iov_base); + dst[i].iov_len = ciov[i].iov_len; + } + return 0; + } +#endif + + if (count * sizeof(struct iovec) != transferred) + return -EIO; + + memcpy(dst, src, transferred); + return 0; +} + +/* Make sure iov_length() won't overflow */ +static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) +{ + size_t n; + u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; + + for (n = 0; n < count; n++, iov++) { + if (iov->iov_len > (size_t) max) + return -ENOMEM; + max -= iov->iov_len; + } + return 0; +} + +static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, + void *src, size_t transferred, unsigned count, + bool is_compat) +{ + unsigned i; + struct fuse_ioctl_iovec *fiov = src; + + if (fc->minor < 16) { + return fuse_copy_ioctl_iovec_old(dst, src, transferred, + count, is_compat); + } + + if (count * sizeof(struct fuse_ioctl_iovec) != transferred) + return -EIO; + + for (i = 0; i < count; i++) { + /* Did the server supply an inappropriate value? */ + if (fiov[i].base != (unsigned long) fiov[i].base || + fiov[i].len != (unsigned long) fiov[i].len) + return -EIO; + + dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; + dst[i].iov_len = (size_t) fiov[i].len; + +#ifdef CONFIG_COMPAT + if (is_compat && + (ptr_to_compat(dst[i].iov_base) != fiov[i].base || + (compat_size_t) dst[i].iov_len != fiov[i].len)) + return -EIO; +#endif + } + + return 0; +} + + +/* + * For ioctls, there is no generic way to determine how much memory + * needs to be read and/or written. Furthermore, ioctls are allowed + * to dereference the passed pointer, so the parameter requires deep + * copying but FUSE has no idea whatsoever about what to copy in or + * out. + * + * This is solved by allowing FUSE server to retry ioctl with + * necessary in/out iovecs. Let's assume the ioctl implementation + * needs to read in the following structure. + * + * struct a { + * char *buf; + * size_t buflen; + * } + * + * On the first callout to FUSE server, inarg->in_size and + * inarg->out_size will be NULL; then, the server completes the ioctl + * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and + * the actual iov array to + * + * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } + * + * which tells FUSE to copy in the requested area and retry the ioctl. + * On the second round, the server has access to the structure and + * from that it can tell what to look for next, so on the invocation, + * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to + * + * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, + * { .iov_base = a.buf, .iov_len = a.buflen } } + * + * FUSE will copy both struct a and the pointed buffer from the + * process doing the ioctl and retry ioctl with both struct a and the + * buffer. + * + * This time, FUSE server has everything it needs and completes ioctl + * without FUSE_IOCTL_RETRY which finishes the ioctl call. + * + * Copying data out works the same way. + * + * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel + * automatically initializes in and out iovs by decoding @cmd with + * _IOC_* macros and the server is not allowed to request RETRY. This + * limits ioctl data transfers to well-formed ioctls and is the forced + * behavior for all FUSE servers. + */ +long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, + unsigned int flags) +{ + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; + struct fuse_ioctl_in inarg = { + .fh = ff->fh, + .cmd = cmd, + .arg = arg, + .flags = flags + }; + struct fuse_ioctl_out outarg; + struct fuse_req *req = NULL; + struct page **pages = NULL; + struct iovec *iov_page = NULL; + struct iovec *in_iov = NULL, *out_iov = NULL; + unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; + size_t in_size, out_size, transferred; + int err; + +#if BITS_PER_LONG == 32 + inarg.flags |= FUSE_IOCTL_32BIT; +#else + if (flags & FUSE_IOCTL_COMPAT) + inarg.flags |= FUSE_IOCTL_32BIT; +#endif + + /* assume all the iovs returned by client always fits in a page */ + BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); + + err = -ENOMEM; + pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, sizeof(pages[0]), GFP_KERNEL); + iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); + if (!pages || !iov_page) + goto out; + + /* + * If restricted, initialize IO parameters as encoded in @cmd. + * RETRY from server is not allowed. + */ + if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { + struct iovec *iov = iov_page; + + iov->iov_base = (void __user *)arg; + iov->iov_len = _IOC_SIZE(cmd); + + if (_IOC_DIR(cmd) & _IOC_WRITE) { + in_iov = iov; + in_iovs = 1; + } + + if (_IOC_DIR(cmd) & _IOC_READ) { + out_iov = iov; + out_iovs = 1; + } + } + + retry: + inarg.in_size = in_size = iov_length(in_iov, in_iovs); + inarg.out_size = out_size = iov_length(out_iov, out_iovs); + + /* + * Out data can be used either for actual out data or iovs, + * make sure there always is at least one page. + */ + out_size = max_t(size_t, out_size, PAGE_SIZE); + max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); + + /* make sure there are enough buffer pages and init request with them */ + err = -ENOMEM; + if (max_pages > FUSE_MAX_PAGES_PER_REQ) + goto out; + while (num_pages < max_pages) { + pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); + if (!pages[num_pages]) + goto out; + num_pages++; + } + + req = fuse_get_req(fc, num_pages); + if (IS_ERR(req)) { + err = PTR_ERR(req); + req = NULL; + goto out; + } + memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); + req->num_pages = num_pages; + fuse_page_descs_length_init(req, 0, req->num_pages); + + /* okay, let's send it to the client */ + req->in.h.opcode = FUSE_IOCTL; + req->in.h.nodeid = ff->nodeid; + req->in.numargs = 1; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + if (in_size) { + req->in.numargs++; + req->in.args[1].size = in_size; + req->in.argpages = 1; + + err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, + false); + if (err) + goto out; + } + + req->out.numargs = 2; + req->out.args[0].size = sizeof(outarg); + req->out.args[0].value = &outarg; + req->out.args[1].size = out_size; + req->out.argpages = 1; + req->out.argvar = 1; + + fuse_request_send(fc, req); + err = req->out.h.error; + transferred = req->out.args[1].size; + fuse_put_request(fc, req); + req = NULL; + if (err) + goto out; + + /* did it ask for retry? */ + if (outarg.flags & FUSE_IOCTL_RETRY) { + void *vaddr; + + /* no retry if in restricted mode */ + err = -EIO; + if (!(flags & FUSE_IOCTL_UNRESTRICTED)) + goto out; + + in_iovs = outarg.in_iovs; + out_iovs = outarg.out_iovs; + + /* + * Make sure things are in boundary, separate checks + * are to protect against overflow. + */ + err = -ENOMEM; + if (in_iovs > FUSE_IOCTL_MAX_IOV || + out_iovs > FUSE_IOCTL_MAX_IOV || + in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) + goto out; + + vaddr = kmap_atomic(pages[0]); + err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, + transferred, in_iovs + out_iovs, + (flags & FUSE_IOCTL_COMPAT) != 0); + kunmap_atomic(vaddr); + if (err) + goto out; + + in_iov = iov_page; + out_iov = in_iov + in_iovs; + + err = fuse_verify_ioctl_iov(in_iov, in_iovs); + if (err) + goto out; + + err = fuse_verify_ioctl_iov(out_iov, out_iovs); + if (err) + goto out; + + goto retry; + } + + err = -EIO; + if (transferred > inarg.out_size) + goto out; + + err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); + out: + if (req) + fuse_put_request(fc, req); + free_page((unsigned long) iov_page); + while (num_pages) + __free_page(pages[--num_pages]); + kfree(pages); + + return err ? err : outarg.result; +} +EXPORT_SYMBOL_GPL(fuse_do_ioctl); + +long fuse_ioctl_common(struct file *file, unsigned int cmd, + unsigned long arg, unsigned int flags) +{ + struct inode *inode = file_inode(file); + struct fuse_conn *fc = get_fuse_conn(inode); + + if (!fuse_allow_current_process(fc)) + return -EACCES; + + if (is_bad_inode(inode)) + return -EIO; + + return fuse_do_ioctl(file, cmd, arg, flags); +} + +static long fuse_file_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return fuse_ioctl_common(file, cmd, arg, 0); +} + +static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); +} + +/* + * All files which have been polled are linked to RB tree + * fuse_conn->polled_files which is indexed by kh. Walk the tree and + * find the matching one. + */ +static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, + struct rb_node **parent_out) +{ + struct rb_node **link = &fc->polled_files.rb_node; + struct rb_node *last = NULL; + + while (*link) { + struct fuse_file *ff; + + last = *link; + ff = rb_entry(last, struct fuse_file, polled_node); + + if (kh < ff->kh) + link = &last->rb_left; + else if (kh > ff->kh) + link = &last->rb_right; + else + return link; + } + + if (parent_out) + *parent_out = last; + return link; +} + +/* + * The file is about to be polled. Make sure it's on the polled_files + * RB tree. Note that files once added to the polled_files tree are + * not removed before the file is released. This is because a file + * polled once is likely to be polled again. + */ +static void fuse_register_polled_file(struct fuse_conn *fc, + struct fuse_file *ff) +{ + spin_lock(&fc->lock); + if (RB_EMPTY_NODE(&ff->polled_node)) { + struct rb_node **link, *uninitialized_var(parent); + + link = fuse_find_polled_node(fc, ff->kh, &parent); + BUG_ON(*link); + rb_link_node(&ff->polled_node, parent, link); + rb_insert_color(&ff->polled_node, &fc->polled_files); + } + spin_unlock(&fc->lock); +} + +unsigned fuse_file_poll(struct file *file, poll_table *wait) +{ + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; + struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; + struct fuse_poll_out outarg; + struct fuse_req *req; + int err; + + if (fc->no_poll) + return DEFAULT_POLLMASK; + + poll_wait(file, &ff->poll_wait, wait); + inarg.events = (__u32)poll_requested_events(wait); + + /* + * Ask for notification iff there's someone waiting for it. + * The client may ignore the flag and always notify. + */ + if (waitqueue_active(&ff->poll_wait)) { + inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; + fuse_register_polled_file(fc, ff); + } + + req = fuse_get_req_nopages(fc); + if (IS_ERR(req)) + return POLLERR; + + req->in.h.opcode = FUSE_POLL; + req->in.h.nodeid = ff->nodeid; + req->in.numargs = 1; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->out.numargs = 1; + req->out.args[0].size = sizeof(outarg); + req->out.args[0].value = &outarg; + fuse_request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + + if (!err) + return outarg.revents; + if (err == -ENOSYS) { + fc->no_poll = 1; + return DEFAULT_POLLMASK; + } + return POLLERR; +} +EXPORT_SYMBOL_GPL(fuse_file_poll); + +/* + * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and + * wakes up the poll waiters. + */ +int fuse_notify_poll_wakeup(struct fuse_conn *fc, + struct fuse_notify_poll_wakeup_out *outarg) +{ + u64 kh = outarg->kh; + struct rb_node **link; + + spin_lock(&fc->lock); + + link = fuse_find_polled_node(fc, kh, NULL); + if (*link) { + struct fuse_file *ff; + + ff = rb_entry(*link, struct fuse_file, polled_node); + wake_up_interruptible_sync(&ff->poll_wait); + } + + spin_unlock(&fc->lock); + return 0; +} + +static void fuse_do_truncate(struct file *file) +{ + struct inode *inode = file->f_mapping->host; + struct iattr attr; + + attr.ia_valid = ATTR_SIZE; + attr.ia_size = i_size_read(inode); + + attr.ia_file = file; + attr.ia_valid |= ATTR_FILE; + + fuse_do_setattr(inode, &attr, file); +} + +static inline loff_t fuse_round_up(loff_t off) +{ + return round_up(off, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); +} + +static ssize_t +fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, + loff_t offset) +{ + ssize_t ret = 0; + struct file *file = iocb->ki_filp; + struct fuse_file *ff = file->private_data; + bool async_dio = ff->fc->async_dio; + loff_t pos = 0; + struct inode *inode; + loff_t i_size; + size_t count = iov_iter_count(iter); + struct fuse_io_priv *io; + + pos = offset; + inode = file->f_mapping->host; + i_size = i_size_read(inode); + + if ((rw == READ) && (offset > i_size)) + return 0; + + /* optimization for short read */ + if (async_dio && rw != WRITE && offset + count > i_size) { + if (offset >= i_size) + return 0; + count = min_t(loff_t, count, fuse_round_up(i_size - offset)); + iov_iter_truncate(iter, count); + } + + io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); + if (!io) + return -ENOMEM; + spin_lock_init(&io->lock); + io->reqs = 1; + io->bytes = -1; + io->size = 0; + io->offset = offset; + io->write = (rw == WRITE); + io->err = 0; + io->file = file; + /* + * By default, we want to optimize all I/Os with async request + * submission to the client filesystem if supported. + */ + io->async = async_dio; + io->iocb = iocb; + + /* + * We cannot asynchronously extend the size of a file. We have no method + * to wait on real async I/O requests, so we must submit this request + * synchronously. + */ + if (!is_sync_kiocb(iocb) && (offset + count > i_size) && rw == WRITE) + io->async = false; + + if (rw == WRITE) + ret = __fuse_direct_write(io, iter, &pos); + else + ret = __fuse_direct_read(io, iter, &pos); + + if (io->async) { + fuse_aio_complete(io, ret < 0 ? ret : 0, -1); + + /* we have a non-extending, async request, so return */ + if (!is_sync_kiocb(iocb)) + return -EIOCBQUEUED; + + ret = wait_on_sync_kiocb(iocb); + } else { + kfree(io); + } + + if (rw == WRITE) { + if (ret > 0) + fuse_write_update_size(inode, pos); + else if (ret < 0 && offset + count > i_size) + fuse_do_truncate(file); + } + + return ret; +} + +static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, + loff_t length) +{ + struct fuse_file *ff = file->private_data; + struct inode *inode = file->f_inode; + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_conn *fc = ff->fc; + struct fuse_req *req; + struct fuse_fallocate_in inarg = { + .fh = ff->fh, + .offset = offset, + .length = length, + .mode = mode + }; + int err; + bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) || + (mode & FALLOC_FL_PUNCH_HOLE); + + if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) + return -EOPNOTSUPP; + + if (fc->no_fallocate) + return -EOPNOTSUPP; + + if (lock_inode) { + mutex_lock(&inode->i_mutex); + if (mode & FALLOC_FL_PUNCH_HOLE) { + loff_t endbyte = offset + length - 1; + err = filemap_write_and_wait_range(inode->i_mapping, + offset, endbyte); + if (err) + goto out; + + fuse_sync_writes(inode); + } + } + + if (!(mode & FALLOC_FL_KEEP_SIZE)) + set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); + + req = fuse_get_req_nopages(fc); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + req->in.h.opcode = FUSE_FALLOCATE; + req->in.h.nodeid = ff->nodeid; + req->in.numargs = 1; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + fuse_request_send(fc, req); + err = req->out.h.error; + if (err == -ENOSYS) { + fc->no_fallocate = 1; + err = -EOPNOTSUPP; + } + fuse_put_request(fc, req); + + if (err) + goto out; + + /* we could have extended the file */ + if (!(mode & FALLOC_FL_KEEP_SIZE)) { + bool changed = fuse_write_update_size(inode, offset + length); + + if (changed && fc->writeback_cache) + file_update_time(file); + } + + if (mode & FALLOC_FL_PUNCH_HOLE) + truncate_pagecache_range(inode, offset, offset + length - 1); + + fuse_invalidate_attr(inode); + +out: + if (!(mode & FALLOC_FL_KEEP_SIZE)) + clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); + + if (lock_inode) + mutex_unlock(&inode->i_mutex); + + return err; +} + static const struct file_operations fuse_file_operations = { - .llseek = generic_file_llseek, - .read = do_sync_read, - .aio_read = fuse_file_aio_read, - .write = do_sync_write, - .aio_write = generic_file_aio_write, + .llseek = fuse_file_llseek, + .read = new_sync_read, + .read_iter = fuse_file_read_iter, + .write = new_sync_write, + .write_iter = fuse_file_write_iter, .mmap = fuse_file_mmap, .open = fuse_open, .flush = fuse_flush, @@ -923,28 +3043,41 @@ static const struct file_operations fuse_file_operations = { .lock = fuse_file_lock, .flock = fuse_file_flock, .splice_read = generic_file_splice_read, + .unlocked_ioctl = fuse_file_ioctl, + .compat_ioctl = fuse_file_compat_ioctl, + .poll = fuse_file_poll, + .fallocate = fuse_file_fallocate, }; static const struct file_operations fuse_direct_io_file_operations = { - .llseek = generic_file_llseek, + .llseek = fuse_file_llseek, .read = fuse_direct_read, .write = fuse_direct_write, + .mmap = fuse_direct_mmap, .open = fuse_open, .flush = fuse_flush, .release = fuse_release, .fsync = fuse_fsync, .lock = fuse_file_lock, .flock = fuse_file_flock, - /* no mmap and splice_read */ + .unlocked_ioctl = fuse_file_ioctl, + .compat_ioctl = fuse_file_compat_ioctl, + .poll = fuse_file_poll, + .fallocate = fuse_file_fallocate, + /* no splice_read */ }; static const struct address_space_operations fuse_file_aops = { .readpage = fuse_readpage, - .write_begin = fuse_write_begin, - .write_end = fuse_write_end, + .writepage = fuse_writepage, + .writepages = fuse_writepages, + .launder_page = fuse_launder_page, .readpages = fuse_readpages, - .set_page_dirty = fuse_set_page_dirty, + .set_page_dirty = __set_page_dirty_nobuffers, .bmap = fuse_bmap, + .direct_IO = fuse_direct_IO, + .write_begin = fuse_write_begin, + .write_end = fuse_write_end, }; void fuse_init_file_inode(struct inode *inode) |