| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <161161059859.2537118.3305621799356778773.stgit@warthog.procyon.org.uk>
Date: Mon, 25 Jan 2021 21:36:38 +0000
From: David Howells <dhowells@...hat.com>
To: Trond Myklebust <trondmy@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>
Cc: Dave Wysochanski <dwysocha@...hat.com>, dhowells@...hat.com,
Jeff Layton <jlayton@...hat.com>,
David Wysochanski <dwysocha@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 29/32] NFS: Add nfs_pageio_complete_read() and remove
nfs_readpage_async()
From: Dave Wysochanski <dwysocha@...hat.com>
Add nfs_pageio_complete_read() and call this from both nfs_readpage()
and nfs_readpages(), since the submission and accounting is the same
for both functions.
Signed-off-by: Dave Wysochanski <dwysocha@...hat.com>
---
fs/nfs/read.c | 137 +++++++++++++++++++++---------------------------
include/linux/nfs_fs.h | 1
2 files changed, 61 insertions(+), 77 deletions(-)
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 1401f1c734c0..c2df4040f26c 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -74,6 +74,24 @@ void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
}
EXPORT_SYMBOL_GPL(nfs_pageio_init_read);
+static void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode)
+{
+ struct nfs_pgio_mirror *pgm;
+ unsigned long npages;
+
+ nfs_pageio_complete(pgio);
+
+ /* It doesn't make sense to do mirrored reads! */
+ WARN_ON_ONCE(pgio->pg_mirror_count != 1);
+
+ pgm = &pgio->pg_mirrors[0];
+ NFS_I(inode)->read_io += pgm->pg_bytes_written;
+ npages = (pgm->pg_bytes_written + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ nfs_add_stats(inode, NFSIOS_READPAGES, npages);
+}
+
+
void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio)
{
struct nfs_pgio_mirror *mirror;
@@ -119,36 +137,6 @@ struct nfs_readdesc {
struct nfs_open_context *ctx;
};
-static int readpage_async_filler(void *data, struct page *page);
-
-int nfs_readpage_async(void *data, struct inode *inode,
- struct page *page)
-{
- struct nfs_readdesc *desc = (struct nfs_readdesc *)data;
- struct nfs_pgio_mirror *pgm;
- int error;
-
- nfs_pageio_init_read(&desc->pgio, inode, false,
- &nfs_async_read_completion_ops);
-
- error = readpage_async_filler(desc, page);
- if (error)
- goto out;
-
- nfs_pageio_complete(&desc->pgio);
-
- /* It doesn't make sense to do mirrored reads! */
- WARN_ON_ONCE(desc->pgio.pg_mirror_count != 1);
-
- pgm = &desc->pgio.pg_mirrors[0];
- NFS_I(inode)->read_io += pgm->pg_bytes_written;
-
- return desc->pgio.pg_error < 0 ? desc->pgio.pg_error : 0;
-
-out:
- return error;
-}
-
static void nfs_page_group_set_uptodate(struct nfs_page *req)
{
if (nfs_page_group_sync_on_bit(req, PG_UPTODATE))
@@ -170,8 +158,7 @@ static void nfs_read_completion(struct nfs_pgio_header *hdr)
if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) {
/* note: regions of the page not covered by a
- * request are zeroed in nfs_readpage_async /
- * readpage_async_filler */
+ * request are zeroed in readpage_async_filler */
if (bytes > hdr->good_bytes) {
/* nothing in this request was good, so zero
* the full extent of the request */
@@ -303,6 +290,38 @@ static void nfs_readpage_result(struct rpc_task *task,
nfs_readpage_retry(task, hdr);
}
+static int
+readpage_async_filler(void *data, struct page *page)
+{
+ struct nfs_readdesc *desc = (struct nfs_readdesc *)data;
+ struct nfs_page *new;
+ unsigned int len;
+ int error;
+
+ len = nfs_page_length(page);
+ if (len == 0)
+ return nfs_return_empty_page(page);
+
+ new = nfs_create_request(desc->ctx, page, 0, len);
+ if (IS_ERR(new))
+ goto out_error;
+
+ if (len < PAGE_SIZE)
+ zero_user_segment(page, len, PAGE_SIZE);
+ if (!nfs_pageio_add_request(&desc->pgio, new)) {
+ nfs_list_remove_request(new);
+ error = desc->pgio.pg_error;
+ nfs_readpage_release(new, error);
+ goto out;
+ }
+ return 0;
+out_error:
+ error = PTR_ERR(new);
+ unlock_page(page);
+out:
+ return error;
+}
+
/*
* Read a page over NFS.
* We read the page synchronously in the following case:
@@ -351,13 +370,20 @@ int nfs_readpage(struct file *filp, struct page *page)
}
xchg(&desc.ctx->error, 0);
- ret = nfs_readpage_async(&desc, inode, page);
+ nfs_pageio_init_read(&desc.pgio, inode, false,
+ &nfs_async_read_completion_ops);
+
+ ret = readpage_async_filler(&desc, page);
+
+ if (!ret)
+ nfs_pageio_complete_read(&desc.pgio, inode);
+
+ ret = desc.pgio.pg_error < 0 ? desc.pgio.pg_error : 0;
if (!ret) {
ret = wait_on_page_locked_killable(page);
if (!PageUptodate(page) && !ret)
ret = xchg(&desc.ctx->error, 0);
}
- nfs_add_stats(inode, NFSIOS_READPAGES, 1);
out:
put_nfs_open_context(desc.ctx);
return ret;
@@ -366,45 +392,11 @@ int nfs_readpage(struct file *filp, struct page *page)
return ret;
}
-static int
-readpage_async_filler(void *data, struct page *page)
-{
- struct nfs_readdesc *desc = (struct nfs_readdesc *)data;
- struct nfs_page *new;
- unsigned int len;
- int error;
-
- len = nfs_page_length(page);
- if (len == 0)
- return nfs_return_empty_page(page);
-
- new = nfs_create_request(desc->ctx, page, 0, len);
- if (IS_ERR(new))
- goto out_error;
-
- if (len < PAGE_SIZE)
- zero_user_segment(page, len, PAGE_SIZE);
- if (!nfs_pageio_add_request(&desc->pgio, new)) {
- nfs_list_remove_request(new);
- error = desc->pgio.pg_error;
- nfs_readpage_release(new, error);
- goto out;
- }
- return 0;
-out_error:
- error = PTR_ERR(new);
- unlock_page(page);
-out:
- return error;
-}
-
int nfs_readpages(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
- struct nfs_pgio_mirror *pgm;
struct nfs_readdesc desc;
struct inode *inode = mapping->host;
- unsigned long npages;
int ret;
dprintk("NFS: nfs_readpages (%s/%Lu %d)\n",
@@ -437,16 +429,9 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
&nfs_async_read_completion_ops);
ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
- nfs_pageio_complete(&desc.pgio);
- /* It doesn't make sense to do mirrored reads! */
- WARN_ON_ONCE(desc.pgio.pg_mirror_count != 1);
+ nfs_pageio_complete_read(&desc.pgio, inode);
- pgm = &desc.pgio.pg_mirrors[0];
- NFS_I(inode)->read_io += pgm->pg_bytes_written;
- npages = (pgm->pg_bytes_written + PAGE_SIZE - 1) >>
- PAGE_SHIFT;
- nfs_add_stats(inode, NFSIOS_READPAGES, npages);
read_complete:
put_nfs_open_context(desc.ctx);
out:
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index cb0248a34518..3cfcf219e96b 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -570,7 +570,6 @@ nfs_have_writebacks(struct inode *inode)
extern int nfs_readpage(struct file *, struct page *);
extern int nfs_readpages(struct file *, struct address_space *,
struct list_head *, unsigned);
-extern int nfs_readpage_async(void *, struct inode *, struct page *);
/*
* inline functions
Powered by blists - more mailing lists