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fuse: convert readpages to simple api 

Need to extend fuse_io_args with 'attr_ver' and 'ff' members, that take the
functionality of the same named members in fuse_req.

fuse_short_read() can now take struct fuse_args_pages.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-09-10 15:04:10 +02:00
parent 45ac96ed7c
commit 134831e36b
1 changed files with 71 additions and 66 deletions
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137
fs/fuse/file.c
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@ -556,6 +556,7 @@ struct fuse_io_args {
union {
struct {
struct fuse_read_in in;
u64 attr_ver;
} read;
struct {
struct fuse_write_in in;
@ -564,6 +565,7 @@ struct fuse_io_args {
};
struct fuse_args_pages ap;
struct fuse_io_priv *io;
struct fuse_file *ff;
};
void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
@ -770,7 +772,7 @@ static void fuse_read_update_size(struct inode *inode, loff_t size,
}
static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read,
struct page **pages, unsigned int num_pages)
struct fuse_args_pages *ap)
{
struct fuse_conn *fc = get_fuse_conn(inode);
@ -784,12 +786,12 @@ static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read,
int start_idx = num_read >> PAGE_SHIFT;
size_t off = num_read & (PAGE_SIZE - 1);
for (i = start_idx; i < num_pages; i++) {
zero_user_segment(pages[i], off, PAGE_SIZE);
for (i = start_idx; i < ap->num_pages; i++) {
zero_user_segment(ap->pages[i], off, PAGE_SIZE);
off = 0;
}
} else {
loff_t pos = page_offset(pages[0]) + num_read;
loff_t pos = page_offset(ap->pages[0]) + num_read;
fuse_read_update_size(inode, pos, attr_ver);
}
}
@ -827,8 +829,7 @@ static int fuse_do_readpage(struct file *file, struct page *page)
* Short read means EOF. If file size is larger, truncate it
*/
if (res < desc.length)
fuse_short_read(inode, attr_ver, res, ia.ap.pages,
ia.ap.num_pages);
fuse_short_read(inode, attr_ver, res, &ia.ap);
SetPageUptodate(page);
@ -851,15 +852,18 @@ static int fuse_readpage(struct file *file, struct page *page)
return err;
}
static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_args *args,
int err)
{
int i;
size_t count = req->misc.read.in.size;
size_t num_read = req->out.args[0].size;
struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
struct fuse_args_pages *ap = &ia->ap;
size_t count = ia->read.in.size;
size_t num_read = args->out_args[0].size;
struct address_space *mapping = NULL;
for (i = 0; mapping == NULL && i < req->num_pages; i++)
mapping = req->pages[i]->mapping;
for (i = 0; mapping == NULL && i < ap->num_pages; i++)
mapping = ap->pages[i]->mapping;
if (mapping) {
struct inode *inode = mapping->host;
@ -867,94 +871,97 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
/*
* Short read means EOF. If file size is larger, truncate it
*/
if (!req->out.h.error && num_read < count)
fuse_short_read(inode, req->misc.read.attr_ver,
num_read, req->pages, req->num_pages);
if (!err && num_read < count)
fuse_short_read(inode, ia->read.attr_ver, num_read, ap);
fuse_invalidate_atime(inode);
}
for (i = 0; i < req->num_pages; i++) {
struct page *page = req->pages[i];
if (!req->out.h.error)
for (i = 0; i < ap->num_pages; i++) {
struct page *page = ap->pages[i];
if (!err)
SetPageUptodate(page);
else
SetPageError(page);
unlock_page(page);
put_page(page);
}
if (req->ff)
fuse_file_put(req->ff, false, false);
if (ia->ff)
fuse_file_put(ia->ff, false, false);
fuse_io_free(ia);
}
static void fuse_send_readpages(struct fuse_req *req, struct file *file)
static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
{
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_SHIFT;
struct fuse_args_pages *ap = &ia->ap;
loff_t pos = page_offset(ap->pages[0]);
size_t count = ap->num_pages << PAGE_SHIFT;
int err;
req->out.argpages = 1;
req->out.page_zeroing = 1;
req->out.page_replace = 1;
fuse_read_fill(req, file, pos, count, FUSE_READ);
req->misc.read.attr_ver = fuse_get_attr_version(fc);
ap->args.out_pages = true;
ap->args.page_zeroing = true;
ap->args.page_replace = true;
fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
ia->read.attr_ver = fuse_get_attr_version(fc);
if (fc->async_read) {
req->ff = fuse_file_get(ff);
req->end = fuse_readpages_end;
fuse_request_send_background(fc, req);
ia->ff = fuse_file_get(ff);
ap->args.end = fuse_readpages_end;
err = fuse_simple_background(fc, &ap->args, GFP_KERNEL);
if (!err)
return;
} else {
fuse_request_send(fc, req);
fuse_readpages_end(fc, req);
fuse_put_request(fc, req);
err = fuse_simple_request(fc, &ap->args);
}
fuse_readpages_end(fc, &ap->args, err);
}
struct fuse_fill_data {
struct fuse_req *req;
struct fuse_io_args *ia;
struct file *file;
struct inode *inode;
unsigned nr_pages;
unsigned int nr_pages;
unsigned int max_pages;
};
static int fuse_readpages_fill(void *_data, struct page *page)
{
struct fuse_fill_data *data = _data;
struct fuse_req *req = data->req;
struct fuse_io_args *ia = data->ia;
struct fuse_args_pages *ap = &ia->ap;
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 == fc->max_pages ||
(req->num_pages + 1) * PAGE_SIZE > fc->max_read ||
req->pages[req->num_pages - 1]->index + 1 != page->index)) {
unsigned int nr_alloc = min_t(unsigned int, data->nr_pages,
fc->max_pages);
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)) {
if (ap->num_pages &&
(ap->num_pages == fc->max_pages ||
(ap->num_pages + 1) * PAGE_SIZE > fc->max_read ||
ap->pages[ap->num_pages - 1]->index + 1 != page->index)) {
data->max_pages = min_t(unsigned int, data->nr_pages,
fc->max_pages);
fuse_send_readpages(ia, data->file);
data->ia = ia = fuse_io_alloc(NULL, data->max_pages);
if (!ia) {
unlock_page(page);
return PTR_ERR(req);
return -ENOMEM;
}
ap = &ia->ap;
}
if (WARN_ON(req->num_pages >= req->max_pages)) {
if (WARN_ON(ap->num_pages >= data->max_pages)) {
unlock_page(page);
fuse_put_request(fc, req);
fuse_io_free(ia);
return -EIO;
}
get_page(page);
req->pages[req->num_pages] = page;
req->page_descs[req->num_pages].length = PAGE_SIZE;
req->num_pages++;
ap->pages[ap->num_pages] = page;
ap->descs[ap->num_pages].length = PAGE_SIZE;
ap->num_pages++;
data->nr_pages--;
return 0;
}
@ -966,7 +973,6 @@ 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;
unsigned int nr_alloc = min_t(unsigned int, nr_pages, fc->max_pages);
err = -EIO;
if (is_bad_inode(inode))
@ -974,21 +980,20 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
data.file = file;
data.inode = inode;
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))
data.max_pages = min_t(unsigned int, nr_pages, fc->max_pages);
;
data.ia = fuse_io_alloc(NULL, data.max_pages);
err = -ENOMEM;
if (!data.ia)
goto out;
err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
if (!err) {
if (data.req->num_pages)
fuse_send_readpages(data.req, file);
if (data.ia->ap.num_pages)
fuse_send_readpages(data.ia, file);
else
fuse_put_request(fc, data.req);
fuse_io_free(data.ia);
}
out:
return err;