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afs: Move key to afs_read struct

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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>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/158861248336.340223.1851189950710196001.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/159465823899.1377938.11925978022348532049.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/160588529557.3465195.7303323479305254243.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161118147693.1232039.13780672951838643842.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161161043340.2537118.511899217704140722.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/161340406678.1303470.12676824086429446370.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539550819.286939.1268332875889175195.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/161653806683.2770958.11300984379283401542.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789089556.6155.14603302893431820997.stgit@warthog.procyon.org.uk/ # v6
This commit is contained in:
David Howells 2020-02-06 14:22:27 +00:00
parent f015cf1d6b
commit c69bf479ba
4 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/afs/dir.c
View File

@ -241,6 +241,7 @@ retry:
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 @@ retry:
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;

16
fs/afs/file.c
View File

@ -198,6 +198,7 @@ void afs_put_read(struct afs_read *req)
if (req->pages != req->array)
kfree(req->pages);
}
key_put(req->key);
kfree(req);
}
}
@ -228,7 +229,7 @@ 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;
@ -237,9 +238,9 @@ 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);
@ -278,6 +279,7 @@ 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;
@ -287,7 +289,7 @@ 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) {
@ -372,7 +374,6 @@ 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;
@ -396,6 +397,7 @@ 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;
@ -425,11 +427,11 @@ 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;

3
fs/afs/internal.h
View File

@ -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 *);

12
fs/afs/write.c
View File

@ -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;