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author | Miklos Szeredi <miklos@szeredi.hu> | 2005-09-09 20:10:33 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 21:03:46 (GMT) |
commit | db50b96c0f28a21c5a4a19ecaba12d0972aab06a (patch) | |
tree | d7f2cb99de499c116ce08153a369044af0622c16 /fs/fuse/file.c | |
parent | 06663267b4b1e85ece73236ea720355668d4f736 (diff) | |
download | linux-fsl-qoriq-db50b96c0f28a21c5a4a19ecaba12d0972aab06a.tar.xz |
[PATCH] FUSE - readpages operation
This patch adds readpages support to FUSE.
With the help of the readpages() operation multiple reads are bundled
together and sent as a single request to userspace. This can improve
reading performace.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r-- | fs/fuse/file.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 96ea302..86ffb6d 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -227,6 +227,72 @@ static int fuse_readpage(struct file *file, struct page *page) return err; } +static int fuse_send_readpages(struct fuse_req *req, struct file *file, + struct inode *inode) +{ + loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT; + size_t count = req->num_pages << PAGE_CACHE_SHIFT; + unsigned i; + req->out.page_zeroing = 1; + fuse_send_read(req, file, inode, pos, count); + for (i = 0; i < req->num_pages; i++) { + struct page *page = req->pages[i]; + if (!req->out.h.error) + SetPageUptodate(page); + unlock_page(page); + } + return req->out.h.error; +} + +struct fuse_readpages_data { + struct fuse_req *req; + struct file *file; + struct inode *inode; +}; + +static int fuse_readpages_fill(void *_data, struct page *page) +{ + struct fuse_readpages_data *data = _data; + struct fuse_req *req = data->req; + struct inode *inode = data->inode; + struct fuse_conn *fc = get_fuse_conn(inode); + + if (req->num_pages && + (req->num_pages == FUSE_MAX_PAGES_PER_REQ || + (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || + req->pages[req->num_pages - 1]->index + 1 != page->index)) { + int err = fuse_send_readpages(req, data->file, inode); + if (err) { + unlock_page(page); + return err; + } + fuse_reset_request(req); + } + req->pages[req->num_pages] = page; + req->num_pages ++; + return 0; +} + +static int fuse_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + struct inode *inode = mapping->host; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_readpages_data data; + int err; + data.file = file; + data.inode = inode; + data.req = fuse_get_request_nonint(fc); + if (!data.req) + return -EINTR; + + err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); + if (!err && data.req->num_pages) + err = fuse_send_readpages(data.req, file, inode); + fuse_put_request(fc, data.req); + return err; +} + static ssize_t fuse_send_write(struct fuse_req *req, struct file *file, struct inode *inode, loff_t pos, size_t count) { @@ -331,6 +397,7 @@ static struct address_space_operations fuse_file_aops = { .readpage = fuse_readpage, .prepare_write = fuse_prepare_write, .commit_write = fuse_commit_write, + .readpages = fuse_readpages, .set_page_dirty = fuse_set_page_dirty, }; |