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fuse: convert writepages to simple api

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Derive fuse_writepage_args from fuse_io_args.

Sending the request is tricky since it was done with fi->lock held, hence
we must either use atomic allocation or release the lock.  Both are
possible so try atomic first and if it fails, release the lock and do the
regular allocation with GFP_NOFS and __GFP_NOFAIL.  Both flags are
necessary for correct operation.

Move the page realloc function from dev.c to file.c and convert to using
fuse_writepage_args.

The last caller of fuse_write_fill() is gone, so get rid of it.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2019-09-10 15:04:10 +02:00
parent 43f5098eb8
commit 33826ebbbe
3 changed files with 206 additions and 185 deletions
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27
fs/fuse/dev.c
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@@ -96,33 +96,6 @@ static void fuse_req_pages_free(struct fuse_req *req)
kfree(req->pages);
}
bool fuse_req_realloc_pages(struct fuse_conn *fc, struct fuse_req *req,
gfp_t flags)
{
struct page **pages;
struct fuse_page_desc *page_descs;
unsigned int npages = min_t(unsigned int,
max_t(unsigned int, req->max_pages * 2,
FUSE_DEFAULT_MAX_PAGES_PER_REQ),
fc->max_pages);
WARN_ON(npages <= req->max_pages);
pages = fuse_pages_alloc(npages, flags, &page_descs);
if (!pages)
return false;
memcpy(pages, req->pages, sizeof(struct page *) * req->max_pages);
memcpy(page_descs, req->page_descs,
sizeof(struct fuse_page_desc) * req->max_pages);
fuse_req_pages_free(req);
__set_bit(FR_ALLOC_PAGES, &req->flags);
req->pages = pages;
req->page_descs = page_descs;
req->max_pages = npages;
return true;
}
void fuse_request_free(struct fuse_req *req)
{
fuse_req_pages_free(req);