Commit d07f09f5 authored by Maxim Patlasov's avatar Maxim Patlasov Committed by Miklos Szeredi
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fuse: rework fuse_perform_write()



The patch allocates as many page pointers in fuse_req as needed to cover
interval [pos .. pos+len-1]. Inline helper fuse_wr_pages() is introduced
to hide this cumbersome arithmetic.
Signed-off-by: default avatarMaxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent f8dbdf81
......@@ -881,11 +881,19 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
if (!fc->big_writes)
break;
} while (iov_iter_count(ii) && count < fc->max_write &&
req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0);
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)
......@@ -901,8 +909,9 @@ static ssize_t fuse_perform_write(struct file *file,
do {
struct fuse_req *req;
ssize_t count;
unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii));
req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ);
req = fuse_get_req(fc, nr_pages);
if (IS_ERR(req)) {
err = PTR_ERR(req);
break;
......
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