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Message-ID: <159465823899.1377938.11925978022348532049.stgit@warthog.procyon.org.uk>
Date: Mon, 13 Jul 2020 17:37:19 +0100
From: David Howells <dhowells@...hat.com>
To: Trond Myklebust <trondmy@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Matthew Wilcox <willy@...radead.org>
Cc: Jeff Layton <jlayton@...hat.com>,
Dave Wysochanski <dwysocha@...hat.com>, dhowells@...hat.com,
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 02/13] afs: Move key to afs_read struct
Stash the key used to authenticate read operations in the afs_read struct.
This will be necessary to reissue the operation against the server if a
read from the cache fails in upcoming cache changes.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/afs/dir.c | 3 ++-
fs/afs/file.c | 16 +++++++++-------
fs/afs/internal.h | 3 ++-
fs/afs/write.c | 12 ++++++------
4 files changed, 19 insertions(+), 15 deletions(-)
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 96757f3abd74..a32c9df6d4c4 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -241,6 +241,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
return ERR_PTR(-ENOMEM);
refcount_set(&req->usage, 1);
+ req->key = key_get(key);
req->nr_pages = nr_pages;
req->actual_len = i_size; /* May change */
req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
@@ -306,7 +307,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
trace_afs_reload_dir(dvnode);
- ret = afs_fetch_data(dvnode, key, req);
+ ret = afs_fetch_data(dvnode, req);
if (ret < 0)
goto error_unlock;
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 75058de366a1..3c2352dcf976 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -211,6 +211,7 @@ void afs_put_read(struct afs_read *req)
if (req->pages != req->array)
kfree(req->pages);
}
+ key_put(req->key);
kfree(req);
}
}
@@ -241,7 +242,7 @@ static const struct afs_operation_ops afs_fetch_data_operation = {
/*
* Fetch file data from the volume.
*/
-int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *req)
+int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req)
{
struct afs_operation *op;
@@ -250,9 +251,9 @@ int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *re
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
- key_serial(key));
+ key_serial(req->key));
- op = afs_alloc_operation(key, vnode->volume);
+ op = afs_alloc_operation(req->key, vnode->volume);
if (IS_ERR(op))
return PTR_ERR(op);
@@ -291,6 +292,7 @@ int afs_page_filler(void *data, struct page *page)
* unmarshalling code will clear the unfilled space.
*/
refcount_set(&req->usage, 1);
+ req->key = key_get(key);
req->pos = (loff_t)page->index << PAGE_SHIFT;
req->len = PAGE_SIZE;
req->nr_pages = 1;
@@ -300,7 +302,7 @@ int afs_page_filler(void *data, struct page *page)
/* read the contents of the file from the server into the
* page */
- ret = afs_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, req);
afs_put_read(req);
if (ret < 0) {
@@ -385,7 +387,6 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
struct afs_read *req;
struct list_head *p;
struct page *first, *page;
- struct key *key = afs_file_key(file);
pgoff_t index;
int ret, n, i;
@@ -409,6 +410,7 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
refcount_set(&req->usage, 1);
req->vnode = vnode;
+ req->key = key_get(afs_file_key(file));
req->page_done = afs_readpages_page_done;
req->pos = first->index;
req->pos <<= PAGE_SHIFT;
@@ -438,11 +440,11 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
} while (req->nr_pages < n);
if (req->nr_pages == 0) {
- kfree(req);
+ afs_put_read(req);
return 0;
}
- ret = afs_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, req);
if (ret < 0)
goto error;
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 4ec6a463081f..644a04ce83a3 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -204,6 +204,7 @@ struct afs_read {
loff_t actual_len; /* How much we're actually getting */
loff_t remain; /* Amount remaining */
loff_t file_size; /* File size returned by server */
+ struct key *key; /* The key to use to reissue the read */
afs_dataversion_t data_version; /* Version number returned by server */
refcount_t usage;
unsigned int index; /* Which page we're reading into */
@@ -969,7 +970,7 @@ extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
extern void afs_put_wb_key(struct afs_wb_key *);
extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
-extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
+extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
extern int afs_page_filler(void *, struct page *);
extern void afs_put_read(struct afs_read *);
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 60918b80b729..90dbe12353b6 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -25,9 +25,10 @@ int afs_set_page_dirty(struct page *page)
/*
* partly or wholly fill a page that's under preparation for writing
*/
-static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
+static int afs_fill_page(struct file *file,
loff_t pos, unsigned int len, struct page *page)
{
+ struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
struct afs_read *req;
size_t p;
void *data;
@@ -49,6 +50,7 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
return -ENOMEM;
refcount_set(&req->usage, 1);
+ req->key = afs_file_key(file);
req->pos = pos;
req->len = len;
req->nr_pages = 1;
@@ -56,7 +58,7 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
req->pages[0] = page;
get_page(page);
- ret = afs_fetch_data(vnode, key, req);
+ ret = afs_fetch_data(vnode, req);
afs_put_read(req);
if (ret < 0) {
if (ret == -ENOENT) {
@@ -80,7 +82,6 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
struct page *page;
- struct key *key = afs_file_key(file);
unsigned long priv;
unsigned f, from = pos & (PAGE_SIZE - 1);
unsigned t, to = from + len;
@@ -100,7 +101,7 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
return -ENOMEM;
if (!PageUptodate(page) && len != PAGE_SIZE) {
- ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page);
+ ret = afs_fill_page(file, pos & PAGE_MASK, PAGE_SIZE, page);
if (ret < 0) {
unlock_page(page);
put_page(page);
@@ -183,7 +184,6 @@ int afs_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata)
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
- struct key *key = afs_file_key(file);
loff_t i_size, maybe_i_size;
int ret;
@@ -207,7 +207,7 @@ int afs_write_end(struct file *file, struct address_space *mapping,
* unmarshalling routine will take care of clearing any
* bits that are beyond the EOF.
*/
- ret = afs_fill_page(vnode, key, pos + copied,
+ ret = afs_fill_page(file, pos + copied,
len - copied, page);
if (ret < 0)
goto out;
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