static char *read_link(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_req_nopages(fc);
char *link;
if (IS_ERR(req))
return ERR_CAST(req);
link = (char *) __get_free_page(GFP_KERNEL);
if (!link) {
link = ERR_PTR(-ENOMEM);
goto out;
}
req->in.h.opcode = FUSE_READLINK;
req->in.h.nodeid = get_node_id(inode);
req->out.argvar = 1;
req->out.numargs = 1;
req->out.args[0].size = PAGE_SIZE - 1;
req->out.args[0].value = link;
fuse_request_send(fc, req);
if (req->out.h.error) {
free_page((unsigned long) link);
link = ERR_PTR(req->out.h.error);
} else
link[req->out.args[0].size] = '\0';
out:
fuse_put_request(fc, req);
fuse_invalidate_atime(inode);
return link;
}
static const char *fuse_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct fuse_conn *fc = get_fuse_conn(inode);
FUSE_ARGS(args);
char *link;
ssize_t ret;
if (!dentry)
return ERR_PTR(-ECHILD);
link = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!link)
return ERR_PTR(-ENOMEM);
args.in.h.opcode = FUSE_READLINK;
args.in.h.nodeid = get_node_id(inode);
args.out.argvar = 1;
args.out.numargs = 1;
args.out.args[0].size = PAGE_SIZE - 1;
args.out.args[0].value = link;
ret = fuse_simple_request(fc, &args);
if (ret < 0) {
kfree(link);
link = ERR_PTR(ret);
} else {
link[ret] = '\0';
set_delayed_call(done, kfree_link, link);
}
fuse_invalidate_atime(inode);
return link;
}
static const char *fuse_follow_link(struct dentry *dentry, void **cookie)
{
struct inode *inode = d_inode(dentry);
struct fuse_conn *fc = get_fuse_conn(inode);
FUSE_ARGS(args);
char *link;
ssize_t ret;
link = (char *) __get_free_page(GFP_KERNEL);
if (!link)
return ERR_PTR(-ENOMEM);
args.in.h.opcode = FUSE_READLINK;
args.in.h.nodeid = get_node_id(inode);
args.out.argvar = 1;
args.out.numargs = 1;
args.out.args[0].size = PAGE_SIZE - 1;
args.out.args[0].value = link;
ret = fuse_simple_request(fc, &args);
if (ret < 0) {
free_page((unsigned long) link);
link = ERR_PTR(ret);
} else {
link[ret] = '\0';
*cookie = link;
}
fuse_invalidate_atime(inode);
return link;
}
static int fuse_readdir(struct file *file, struct dir_context *ctx)
{
int plus, err;
size_t nbytes;
struct page *page;
struct inode *inode = file_inode(file);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
u64 attr_version = 0;
if (is_bad_inode(inode))
return -EIO;
req = fuse_get_req(fc, 1);
if (IS_ERR(req))
return PTR_ERR(req);
page = alloc_page(GFP_KERNEL);
if (!page) {
fuse_put_request(fc, req);
return -ENOMEM;
}
plus = fuse_use_readdirplus(inode, ctx);
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = PAGE_SIZE;
if (plus) {
attr_version = fuse_get_attr_version(fc);
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
FUSE_READDIRPLUS);
} else {
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
FUSE_READDIR);
}
fuse_lock_inode(inode);
fuse_request_send(fc, req);
fuse_unlock_inode(inode);
nbytes = req->out.args[0].size;
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err) {
if (plus) {
err = parse_dirplusfile(page_address(page), nbytes,
file, ctx,
attr_version);
} else {
err = parse_dirfile(page_address(page), nbytes, file,
ctx);
}
}
__free_page(page);
fuse_invalidate_atime(inode);
return err;
}
static int fuse_readlink_page(struct inode *inode, struct page *page)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
int err;
req = fuse_get_req(fc, 1);
if (IS_ERR(req))
return PTR_ERR(req);
req->out.page_zeroing = 1;
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = PAGE_SIZE - 1;
req->in.h.opcode = FUSE_READLINK;
req->in.h.nodeid = get_node_id(inode);
req->out.argvar = 1;
req->out.numargs = 1;
req->out.args[0].size = PAGE_SIZE - 1;
fuse_request_send(fc, req);
err = req->out.h.error;
if (!err) {
char *link = page_address(page);
size_t len = req->out.args[0].size;
BUG_ON(len >= PAGE_SIZE);
link[len] = '\0';
}
fuse_put_request(fc, req);
fuse_invalidate_atime(inode);
return err;
}