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| author | Maxim Patlasov <mpatlasov@parallels.com> | 2012-10-26 19:49:00 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2013-01-24 16:21:26 +0100 |
| commit | d07f09f509fb21482096e1975f160b694c0edf84 (patch) | |
| tree | 657076e651b8dee622581b754f9e752461bad98d /fs/fuse/file.c | |
| parent | f8dbdf81821b5ab4c5e86e7b2bd7edb892c159c2 (diff) | |
| download | lwn-d07f09f509fb21482096e1975f160b694c0edf84.tar.gz lwn-d07f09f509fb21482096e1975f160b694c0edf84.zip | |
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: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/file.c')
| -rw-r--r-- | fs/fuse/file.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 5fd06bae1790..b9972502f43a 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -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; |