[PATCH 16/25] afs: Move key to afs_read struct

David Howells
2021-01-20T23:49:56Z

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@redhat.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 7bd659ad959e..96e9e2e60d97 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 */
@@ -305,7 +306,7 @@ 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 21868bfc3a44..d23192b3b933 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -199,6 +199,7 @@ void afs_put_read(struct afs_read *req)
if (req->pages != req->array)
kfree(req->pages);
}
+ key_put(req->key);
kfree(req);
}
}
@@ -229,7 +230,7 @@ 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;

@@ -238,9 +239,9 @@ 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);

@@ -279,6 +280,7 @@ 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;
@@ -288,7 +290,7 @@ 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) {
@@ -373,7 +375,6 @@ 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;

@@ -397,6 +398,7 @@ 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;
@@ -426,11 +428,11 @@ 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 cd545e7dbfb8..4b255d10f726 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 */
@@ -1045,7 +1046,7 @@ 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 9d0cef35ecba..7eba0d3201ba 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 = key_get(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;
@@ -95,7 +96,7 @@ 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);
@@ -163,7 +164,6 @@ 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);
unsigned long priv;
unsigned int f, from = pos & (PAGE_SIZE - 1);
unsigned int t, to = from + copied;
@@ -193,7 +193,7 @@ 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;