From: Maxim Patlasov <MPatlasov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
To: miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org
Cc: riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
dev-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org,
xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org,
fuse-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
jbottomley-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
devel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org,
mgorman-l3A5Bk7waGM@public.gmane.org
Subject: [PATCH 09/16] fuse: restructure fuse_readpage()
Date: Sat, 29 Jun 2013 21:45:19 +0400 [thread overview]
Message-ID: <20130629174509.20175.7283.stgit@maximpc.sw.ru> (raw)
In-Reply-To: <20130629172211.20175.70154.stgit-vWG5eQQidJHciZdyczg/7Q@public.gmane.org>
Move the code filling and sending read request to a separate function. Future
patches will use it for .write_begin -- partial modification of a page
requires reading the page from the storage very similarly to what fuse_readpage
does.
Signed-off-by: Maxim Patlasov <MPatlasov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
---
fs/fuse/file.c | 55 +++++++++++++++++++++++++++++++++++++------------------
1 files changed, 37 insertions(+), 18 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 799bf46..e693e35 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -702,21 +702,14 @@ static void fuse_short_read(struct fuse_req *req, struct inode *inode,
}
}
-static int fuse_readpage(struct file *file, struct page *page)
+static int __fuse_readpage(struct file *file, struct page *page, size_t count,
+ int *err, struct fuse_req **req_pp, u64 *attr_ver_p)
{
struct fuse_io_priv io = { .async = 0, .file = file };
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
size_t num_read;
- loff_t pos = page_offset(page);
- size_t count = PAGE_CACHE_SIZE;
- u64 attr_ver;
- int err;
-
- err = -EIO;
- if (is_bad_inode(inode))
- goto out;
/*
* Page writeback can extend beyond the lifetime of the
@@ -726,20 +719,45 @@ static int fuse_readpage(struct file *file, struct page *page)
fuse_wait_on_page_writeback(inode, page->index);
req = fuse_get_req(fc, 1);
- err = PTR_ERR(req);
+ *err = PTR_ERR(req);
if (IS_ERR(req))
- goto out;
+ return 0;
- attr_ver = fuse_get_attr_version(fc);
+ if (attr_ver_p)
+ *attr_ver_p = fuse_get_attr_version(fc);
req->out.page_zeroing = 1;
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = count;
- num_read = fuse_send_read(req, &io, pos, count, NULL);
- err = req->out.h.error;
+ num_read = fuse_send_read(req, &io, page_offset(page), count, NULL);
+ *err = req->out.h.error;
+
+ if (*err)
+ fuse_put_request(fc, req);
+ else
+ *req_pp = req;
+
+ return num_read;
+}
+
+static int fuse_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = NULL;
+ size_t num_read;
+ size_t count = PAGE_CACHE_SIZE;
+ u64 attr_ver = 0;
+ int err;
+
+ err = -EIO;
+ if (is_bad_inode(inode))
+ goto out;
+
+ num_read = __fuse_readpage(file, page, count, &err, &req, &attr_ver);
if (!err) {
/*
* Short read means EOF. If file size is larger, truncate it
@@ -749,10 +767,11 @@ static int fuse_readpage(struct file *file, struct page *page)
SetPageUptodate(page);
}
-
- fuse_put_request(fc, req);
- fuse_invalidate_attr(inode); /* atime changed */
- out:
+ if (req) {
+ fuse_put_request(fc, req);
+ fuse_invalidate_attr(inode); /* atime changed */
+ }
+out:
unlock_page(page);
return err;
}
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next prev parent reply other threads:[~2013-06-29 17:45 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-29 17:41 [PATCH v5 00/16] fuse: An attempt to implement a write-back cache policy Maxim Patlasov
2013-06-29 17:42 ` [PATCH 01/16] fuse: Linking file to inode helper Maxim Patlasov
2013-06-29 17:42 ` [PATCH 02/16] fuse: Getting file for writeback helper Maxim Patlasov
2013-06-29 17:42 ` [PATCH 04/16] fuse: Prepare to handle multiple pages in writeback Maxim Patlasov
2013-06-29 17:42 ` [PATCH 05/16] fuse: Connection bit for enabling writeback Maxim Patlasov
2013-06-29 17:44 ` [PATCH 06/16] fuse: Trust kernel i_size only - v4 Maxim Patlasov
2013-06-29 17:44 ` [PATCH 07/16] fuse: Trust kernel i_mtime only Maxim Patlasov
2013-07-11 16:14 ` [PATCH 07/16] fuse: Trust kernel i_mtime only -v2 Maxim Patlasov
2013-06-29 17:45 ` [PATCH 08/16] fuse: Flush files on wb close Maxim Patlasov
2013-07-11 16:18 ` [PATCH 08/16] fuse: Flush files on wb close -v2 Maxim Patlasov
[not found] ` <20130629172211.20175.70154.stgit-vWG5eQQidJHciZdyczg/7Q@public.gmane.org>
2013-06-29 17:42 ` [PATCH 03/16] fuse: Prepare to handle short reads Maxim Patlasov
2013-06-29 17:45 ` Maxim Patlasov [this message]
2013-06-29 17:45 ` [PATCH 10/16] fuse: Implement writepages callback Maxim Patlasov
2013-07-19 16:50 ` Miklos Szeredi
2013-08-02 15:40 ` Maxim Patlasov
2013-08-06 16:25 ` Miklos Szeredi
2013-08-06 16:26 ` Eric Boxer
2013-08-09 15:02 ` Maxim Patlasov
2013-08-30 10:12 ` Miklos Szeredi
2013-08-30 14:50 ` Maxim Patlasov
2013-09-03 10:31 ` Miklos Szeredi
2013-09-03 16:02 ` Maxim Patlasov
2013-06-29 17:45 ` [PATCH 11/16] fuse: Implement write_begin/write_end callbacks Maxim Patlasov
2013-06-29 17:46 ` [PATCH 12/16] fuse: fuse_writepage_locked() should wait on writeback Maxim Patlasov
2013-06-29 17:46 ` [PATCH 13/16] fuse: fuse_flush() " Maxim Patlasov
2013-06-29 17:46 ` [PATCH 14/16] fuse: Fix O_DIRECT operations vs cached writeback misorder - v2 Maxim Patlasov
2013-06-29 17:47 ` [PATCH 15/16] fuse: Turn writeback cache on Maxim Patlasov
2013-06-29 17:48 ` [PATCH 16/16] mm: strictlimit feature Maxim Patlasov
2013-07-01 21:16 ` Andrew Morton
2013-07-02 8:33 ` Maxim Patlasov
2013-07-02 17:44 ` [PATCH] mm: strictlimit feature -v2 Maxim Patlasov
2013-07-02 19:38 ` Andrew Morton
2013-07-03 11:01 ` Maxim Patlasov
2013-07-03 23:16 ` Jan Kara
2013-07-05 13:14 ` Maxim Patlasov
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