#include <linux/slab.h>
#include <linux/kernel.h>
-static int fuse_open(struct inode *inode, struct file *file)
+static struct file_operations fuse_direct_io_file_operations;
+
+int fuse_open_common(struct inode *inode, struct file *file, int isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_open_out outarg;
struct fuse_file *ff;
int err;
- /* Restarting the syscall is not allowed if O_CREAT and O_EXCL
- are both set, because creation will fail on the restart */
- int excl = (file->f_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL);
+
+ /* VFS checks this, but only _after_ ->open() */
+ if (file->f_flags & O_DIRECT)
+ return -EINVAL;
err = generic_file_open(inode, file);
if (err)
return err;
}
- if (excl)
- req = fuse_get_request_nonint(fc);
- else
- req = fuse_get_request(fc);
+ req = fuse_get_request(fc);
if (!req)
- return excl ? -EINTR : -ERESTARTSYS;
+ return -EINTR;
err = -ENOMEM;
ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
memset(&inarg, 0, sizeof(inarg));
inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
- req->in.h.opcode = FUSE_OPEN;
+ req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
req->in.numargs = 1;
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
- if (excl)
- request_send_nonint(fc, req);
- else
- request_send(fc, req);
+ request_send(fc, req);
err = req->out.h.error;
- if (!err)
- invalidate_inode_pages(inode->i_mapping);
if (err) {
fuse_request_free(ff->release_req);
kfree(ff);
} else {
+ if (!isdir && (outarg.open_flags & FOPEN_DIRECT_IO))
+ file->f_op = &fuse_direct_io_file_operations;
+ if (!(outarg.open_flags & FOPEN_KEEP_CACHE))
+ invalidate_inode_pages(inode->i_mapping);
ff->fh = outarg.fh;
file->private_data = ff;
}
return err;
}
-static int fuse_release(struct inode *inode, struct file *file)
+int fuse_release_common(struct inode *inode, struct file *file, int isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
inarg->fh = ff->fh;
inarg->flags = file->f_flags & ~O_EXCL;
- req->in.h.opcode = FUSE_RELEASE;
+ req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
req->in.numargs = 1;
return 0;
}
+static int fuse_open(struct inode *inode, struct file *file)
+{
+ return fuse_open_common(inode, file, 0);
+}
+
+static int fuse_release(struct inode *inode, struct file *file)
+{
+ return fuse_release_common(inode, file, 0);
+}
+
static int fuse_flush(struct file *file)
{
struct inode *inode = file->f_dentry->d_inode;
if (fc->no_flush)
return 0;
- req = fuse_get_request_nonint(fc);
+ req = fuse_get_request(fc);
if (!req)
return -EINTR;
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
- request_send_nonint(fc, req);
+ request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err == -ENOSYS) {
return err;
}
-static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
+int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
+ int isdir)
{
struct inode *inode = de->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_fsync_in inarg;
int err;
- if (fc->no_fsync)
+ if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
return 0;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTSYS;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
inarg.fsync_flags = datasync ? 1 : 0;
- req->in.h.opcode = FUSE_FSYNC;
+ req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
req->file = file;
err = req->out.h.error;
fuse_put_request(fc, req);
if (err == -ENOSYS) {
- fc->no_fsync = 1;
+ if (isdir)
+ fc->no_fsyncdir = 1;
+ else
+ fc->no_fsync = 1;
err = 0;
}
return err;
}
-static ssize_t fuse_send_read(struct fuse_req *req, struct file *file,
- struct inode *inode, loff_t pos, size_t count)
+static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
+{
+ return fuse_fsync_common(file, de, datasync, 0);
+}
+
+size_t fuse_send_read_common(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos, size_t count,
+ int isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
inarg.fh = ff->fh;
inarg.offset = pos;
inarg.size = count;
- req->in.h.opcode = FUSE_READ;
+ req->in.h.opcode = isdir ? FUSE_READDIR : FUSE_READ;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;
req->file = file;
req->out.argvar = 1;
req->out.numargs = 1;
req->out.args[0].size = count;
- request_send_nonint(fc, req);
+ request_send(fc, req);
return req->out.args[0].size;
}
+static inline size_t fuse_send_read(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos,
+ size_t count)
+{
+ return fuse_send_read_common(req, file, inode, pos, count, 0);
+}
+
static int fuse_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
loff_t pos = (loff_t) page->index << PAGE_CACHE_SHIFT;
- struct fuse_req *req = fuse_get_request_nonint(fc);
+ struct fuse_req *req = fuse_get_request(fc);
int err = -EINTR;
if (!req)
goto out;
fuse_put_request(fc, req);
if (!err)
SetPageUptodate(page);
+ fuse_invalidate_attr(inode); /* atime changed */
out:
unlock_page(page);
return err;
}
-static ssize_t fuse_send_write(struct fuse_req *req, struct file *file,
- struct inode *inode, loff_t pos, size_t count)
+static int fuse_send_readpages(struct fuse_req *req, struct file *file,
+ struct inode *inode)
+{
+ loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT;
+ size_t count = req->num_pages << PAGE_CACHE_SHIFT;
+ unsigned i;
+ req->out.page_zeroing = 1;
+ fuse_send_read(req, file, inode, pos, count);
+ for (i = 0; i < req->num_pages; i++) {
+ struct page *page = req->pages[i];
+ if (!req->out.h.error)
+ SetPageUptodate(page);
+ unlock_page(page);
+ }
+ return req->out.h.error;
+}
+
+struct fuse_readpages_data {
+ struct fuse_req *req;
+ struct file *file;
+ struct inode *inode;
+};
+
+static int fuse_readpages_fill(void *_data, struct page *page)
+{
+ struct fuse_readpages_data *data = _data;
+ struct fuse_req *req = data->req;
+ struct inode *inode = data->inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ 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)) {
+ int err = fuse_send_readpages(req, data->file, inode);
+ if (err) {
+ unlock_page(page);
+ return err;
+ }
+ fuse_reset_request(req);
+ }
+ req->pages[req->num_pages] = page;
+ req->num_pages ++;
+ return 0;
+}
+
+static int fuse_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct inode *inode = mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_readpages_data data;
+ int err;
+ data.file = file;
+ data.inode = inode;
+ data.req = fuse_get_request(fc);
+ if (!data.req)
+ return -EINTR;
+
+ err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
+ if (!err && data.req->num_pages)
+ err = fuse_send_readpages(data.req, file, inode);
+ fuse_put_request(fc, data.req);
+ fuse_invalidate_attr(inode); /* atime changed */
+ return err;
+}
+
+static size_t fuse_send_write(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos, size_t count)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
req->out.numargs = 1;
req->out.args[0].size = sizeof(struct fuse_write_out);
req->out.args[0].value = &outarg;
- request_send_nonint(fc, req);
+ request_send(fc, req);
return outarg.size;
}
unsigned offset, unsigned to)
{
int err;
- ssize_t nres;
+ size_t nres;
unsigned count = to - offset;
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + offset;
- struct fuse_req *req = fuse_get_request_nonint(fc);
+ struct fuse_req *req = fuse_get_request(fc);
if (!req)
return -EINTR;
clear_page_dirty(page);
SetPageUptodate(page);
}
- } else if (err == -EINTR || err == -EIO)
- fuse_invalidate_attr(inode);
+ }
+ fuse_invalidate_attr(inode);
return err;
}
+static void fuse_release_user_pages(struct fuse_req *req, int write)
+{
+ 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);
+ }
+}
+
+static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
+ unsigned nbytes, int write)
+{
+ unsigned long user_addr = (unsigned long) buf;
+ unsigned offset = user_addr & ~PAGE_MASK;
+ int npages;
+
+ /* This doesn't work with nfsd */
+ if (!current->mm)
+ return -EPERM;
+
+ nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
+ npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ npages = min(npages, 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;
+
+ 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)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ size_t nmax = write ? fc->max_write : fc->max_read;
+ loff_t pos = *ppos;
+ ssize_t res = 0;
+ struct fuse_req *req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ while (count) {
+ size_t tmp;
+ size_t nres;
+ size_t nbytes = min(count, nmax);
+ int err = fuse_get_user_pages(req, buf, nbytes, !write);
+ if (err) {
+ res = err;
+ break;
+ }
+ tmp = (req->num_pages << PAGE_SHIFT) - req->page_offset;
+ nbytes = min(nbytes, tmp);
+ if (write)
+ nres = fuse_send_write(req, file, inode, pos, nbytes);
+ else
+ nres = fuse_send_read(req, file, inode, pos, nbytes);
+ fuse_release_user_pages(req, !write);
+ if (req->out.h.error) {
+ if (!res)
+ res = req->out.h.error;
+ break;
+ } else if (nres > nbytes) {
+ res = -EIO;
+ break;
+ }
+ count -= nres;
+ res += nres;
+ pos += nres;
+ buf += nres;
+ if (nres != nbytes)
+ break;
+ if (count)
+ fuse_reset_request(req);
+ }
+ fuse_put_request(fc, req);
+ if (res > 0) {
+ if (write && pos > i_size_read(inode))
+ i_size_write(inode, pos);
+ *ppos = pos;
+ }
+ fuse_invalidate_attr(inode);
+
+ return res;
+}
+
+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);
+}
+
+static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ ssize_t res;
+ /* Don't allow parallel writes to the same file */
+ down(&inode->i_sem);
+ res = fuse_direct_io(file, buf, count, ppos, 1);
+ up(&inode->i_sem);
+ return res;
+}
+
static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
{
if ((vma->vm_flags & VM_SHARED)) {
.sendfile = generic_file_sendfile,
};
+static struct file_operations fuse_direct_io_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = fuse_direct_read,
+ .write = fuse_direct_write,
+ .open = fuse_open,
+ .flush = fuse_flush,
+ .release = fuse_release,
+ .fsync = fuse_fsync,
+ /* no mmap and sendfile */
+};
+
static struct address_space_operations fuse_file_aops = {
.readpage = fuse_readpage,
.prepare_write = fuse_prepare_write,
.commit_write = fuse_commit_write,
+ .readpages = fuse_readpages,
.set_page_dirty = fuse_set_page_dirty,
};
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