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Subject[PATCH 06/10] afs: Set up the iov_iter before calling afs_extract_data()
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Date
afs_extract_data sets up a temporary iov_iter and passes it to AF_RXRPC
each time it is called to describe the remaining buffer to be filled.

Instead:

(1) Put an iterator in the afs_call struct.

(2) Set the iterator for each marshalling stage to load data into the
appropriate places. A number of convenience functions are provided to
this end (eg. afs_extract_to_buf()).

This iterator is then passed to afs_extract_data().

(3) Use the new ITER_MAPPING iterator when reading data to load directly
into the inode's pages without needing to create a list of them. This
comes with a page-done callback that can be used to unlock pages as
they are filled.

(4) Use the new ITER_DISCARD iterator to discard any excess data provided
by FetchData.

This will allow O_DIRECT calls to be supported in future patches.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/cmservice.c | 40 +++----
fs/afs/dir.c | 191 +++++++++++++++++++++++----------
fs/afs/file.c | 199 +++++++++++++++++++++++------------
fs/afs/fsclient.c | 252 ++++++++++++--------------------------------
fs/afs/internal.h | 52 ++++++++-
fs/afs/rxrpc.c | 41 ++-----
fs/afs/vlclient.c | 104 ++++++++----------
fs/afs/write.c | 8 +
include/linux/fscache.h | 31 +++++
include/trace/events/afs.h | 22 ++--
10 files changed, 499 insertions(+), 441 deletions(-)

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index 58f79301a716..4db62ae8dc1a 100644
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -176,13 +176,13 @@ static int afs_deliver_cb_callback(struct afs_call *call)

switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

/* extract the FID array and its count in two steps */
case 1:
_debug("extract FID count");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -196,13 +196,12 @@ static int afs_deliver_cb_callback(struct afs_call *call)
GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
- call->offset = 0;
+ afs_extract_to_buf(call, call->count * 3 * 4);
call->unmarshall++;

case 2:
_debug("extract FID array");
- ret = afs_extract_data(call, call->buffer,
- call->count * 3 * 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -222,13 +221,13 @@ static int afs_deliver_cb_callback(struct afs_call *call)
cb->cb.type = AFSCM_CB_UNTYPED;
}

- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

/* extract the callback array and its count in two steps */
case 3:
_debug("extract CB count");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -237,13 +236,12 @@ static int afs_deliver_cb_callback(struct afs_call *call)
if (call->count2 != call->count && call->count2 != 0)
return afs_protocol_error(call, -EBADMSG,
afs_eproto_cb_count);
- call->offset = 0;
+ afs_extract_to_buf(call, call->count2 * 3 * 4);
call->unmarshall++;

case 4:
_debug("extract CB array");
- ret = afs_extract_data(call, call->buffer,
- call->count2 * 3 * 4, false);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

@@ -256,7 +254,6 @@ static int afs_deliver_cb_callback(struct afs_call *call)
cb->cb.type = ntohl(*bp++);
}

- call->offset = 0;
call->unmarshall++;
case 5:
break;
@@ -303,7 +300,8 @@ static int afs_deliver_cb_init_call_back_state(struct afs_call *call)

rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);

- ret = afs_extract_data(call, NULL, 0, false);
+ afs_extract_discard(call, 0);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

@@ -332,16 +330,15 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)

switch (call->unmarshall) {
case 0:
- call->offset = 0;
call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
+ afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;

case 1:
_debug("extract UUID");
- ret = afs_extract_data(call, call->buffer,
- 11 * sizeof(__be32), false);
+ ret = afs_extract_data(call, false);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
@@ -364,7 +361,6 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
for (loop = 0; loop < 6; loop++)
r->node[loop] = ntohl(b[loop + 5]);

- call->offset = 0;
call->unmarshall++;

case 2:
@@ -407,7 +403,8 @@ static int afs_deliver_cb_probe(struct afs_call *call)

_enter("");

- ret = afs_extract_data(call, NULL, 0, false);
+ afs_extract_discard(call, 0);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

@@ -455,16 +452,15 @@ static int afs_deliver_cb_probe_uuid(struct afs_call *call)

switch (call->unmarshall) {
case 0:
- call->offset = 0;
call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
+ afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;

case 1:
_debug("extract UUID");
- ret = afs_extract_data(call, call->buffer,
- 11 * sizeof(__be32), false);
+ ret = afs_extract_data(call, false);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
@@ -487,7 +483,6 @@ static int afs_deliver_cb_probe_uuid(struct afs_call *call)
for (loop = 0; loop < 6; loop++)
r->node[loop] = ntohl(b[loop + 5]);

- call->offset = 0;
call->unmarshall++;

case 2:
@@ -572,7 +567,8 @@ static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)

_enter("");

- ret = afs_extract_data(call, NULL, 0, false);
+ afs_extract_discard(call, 0);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 855bf2b79fed..c36b54b7450b 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -105,6 +105,40 @@ struct afs_lookup_cookie {
struct afs_fid fids[50];
};

+/*
+ * Drop the refs that we're holding on the pages we were reading into. We've
+ * got refs on the first nr_pages pages.
+ */
+static void afs_dir_read_cleanup(struct afs_read *req)
+{
+ struct radix_tree_iter iter;
+ struct address_space *mapping = req->iter.mapping;
+ struct page *page;
+ pgoff_t index = req->pos >> PAGE_SHIFT;
+ void __rcu **slot;
+
+ if (unlikely(!req->nr_pages))
+ return;
+
+ rcu_read_lock();
+ radix_tree_for_each_contig(slot, &mapping->i_pages, &iter, index) {
+ page = radix_tree_deref_slot(slot);
+ if (unlikely(!page))
+ continue;
+
+ BUG_ON(radix_tree_exception(page));
+ BUG_ON(PageCompound(page));
+ BUG_ON(page->mapping != req->iter.mapping);
+
+ put_page(page);
+ req->nr_pages--;
+ if (req->nr_pages == 0)
+ break;
+ }
+
+ rcu_read_unlock();
+}
+
/*
* check that a directory page is valid
*/
@@ -130,7 +164,7 @@ static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
qty /= sizeof(union afs_xdr_dir_block);

/* check them */
- dbuf = kmap(page);
+ dbuf = kmap_atomic(page);
for (tmp = 0; tmp < qty; tmp++) {
if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
@@ -148,7 +182,7 @@ static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
}

- kunmap(page);
+ kunmap_atomic(dbuf);

checked:
afs_stat_v(dvnode, n_read_dir);
@@ -158,6 +192,45 @@ static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
return false;
}

+/*
+ * Check all the pages in a directory. All the pages are held pinned.
+ */
+static int afs_dir_check(struct afs_vnode *dvnode, unsigned int nr_pages,
+ loff_t i_size)
+{
+ struct radix_tree_iter iter;
+ struct address_space *mapping = dvnode->vfs_inode.i_mapping;
+ struct page *page;
+ void __rcu **slot;
+ int ret = 0;
+
+ if (unlikely(!nr_pages))
+ return 0;
+
+ rcu_read_lock();
+ radix_tree_for_each_contig(slot, &mapping->i_pages, &iter, 0) {
+ page = radix_tree_deref_slot(slot);
+ if (unlikely(!page)) {
+ pr_warn("kAFS: Missing page in dircheck\n");
+ ret = -EIO;
+ break;
+ }
+ if (page->index >= nr_pages)
+ break;
+
+ BUG_ON(radix_tree_exception(page));
+ BUG_ON(PageCompound(page));
+ BUG_ON(page->mapping != mapping);
+
+ ret = afs_dir_check_page(dvnode, page, i_size);
+ if (ret < 0)
+ break;
+ }
+
+ rcu_read_unlock();
+ return ret;
+}
+
/*
* open an AFS directory file
*/
@@ -184,56 +257,49 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
{
struct afs_read *req;
loff_t i_size;
- int nr_pages, nr_inline, i, n;
- int ret = -ENOMEM;
+ int nr_pages, i, n;
+ int ret;
+
+ _enter("");
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return ERR_PTR(-ENOMEM);
+
+ refcount_set(&req->usage, 1);
+ req->cleanup = afs_dir_read_cleanup;

-retry:
+expand:
i_size = i_size_read(&dvnode->vfs_inode);
+ ret = -EIO;
if (i_size < 2048)
- return ERR_PTR(-EIO);
+ goto error;
+ ret = -EFBIG;
if (i_size > 2048 * 1024)
- return ERR_PTR(-EFBIG);
-
- _enter("%llu", i_size);
+ goto error;

- /* Get a request record to hold the page list. We want to hold it
- * inline if we can, but we don't want to make an order 1 allocation.
- */
nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
- nr_inline = nr_pages;
- if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
- nr_inline = 0;

- req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
- GFP_KERNEL);
- if (!req)
- return ERR_PTR(-ENOMEM);
-
- refcount_set(&req->usage, 1);
- 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 */
req->data_version = dvnode->status.data_version; /* May change */
- if (nr_inline > 0) {
- req->pages = req->array;
- } else {
- req->pages = kcalloc(nr_pages, sizeof(struct page *),
- GFP_KERNEL);
- if (!req->pages)
- goto error;
- }
+ iov_iter_mapping(&req->iter, READ, dvnode->vfs_inode.i_mapping,
+ 0, i_size);

- /* Get a list of all the pages that hold or will hold the directory
- * content. We need to fill in any gaps that we might find where the
- * memory reclaimer has been at work. If there are any gaps, we will
+ /* Fill in any gaps that we might find where the memory reclaimer has
+ * been at work and pin all the pages. If there are any gaps, we will
* need to reread the entire directory contents.
*/
- i = 0;
- do {
+ i = req->nr_pages;
+ while (i < nr_pages) {
+ struct page *pages[8], *page;
+
n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
- req->nr_pages - i,
- req->pages + i);
- _debug("find %u at %u/%u", n, i, req->nr_pages);
+ min_t(unsigned int, nr_pages - i,
+ ARRAY_SIZE(pages)),
+ pages);
+ _debug("find %u at %u/%u", n, i, nr_pages);
+
if (n == 0) {
gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;

@@ -241,23 +307,25 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
afs_stat_v(dvnode, n_inval);

ret = -ENOMEM;
- req->pages[i] = __page_cache_alloc(gfp);
- if (!req->pages[i])
+ page = __page_cache_alloc(gfp);
+ if (!page)
goto error;
- ret = add_to_page_cache_lru(req->pages[i],
+ ret = add_to_page_cache_lru(page,
dvnode->vfs_inode.i_mapping,
i, gfp);
if (ret < 0)
goto error;

- set_page_private(req->pages[i], 1);
- SetPagePrivate(req->pages[i]);
- unlock_page(req->pages[i]);
+ set_page_private(page, 1);
+ SetPagePrivate(page);
+ unlock_page(page);
+ req->nr_pages++;
i++;
} else {
+ req->nr_pages += n;
i += n;
}
- } while (i < req->nr_pages);
+ }

/* If we're going to reload, we need to lock all the pages to prevent
* races.
@@ -280,15 +348,18 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)

task_io_account_read(PAGE_SIZE * req->nr_pages);

- if (req->len < req->file_size)
- goto content_has_grown;
+ if (req->len < req->file_size) {
+ /* The content has grown, so we need to expand the
+ * buffer.
+ */
+ up_write(&dvnode->validate_lock);
+ goto expand;
+ }

/* Validate the data we just read. */
- ret = -EIO;
- for (i = 0; i < req->nr_pages; i++)
- if (!afs_dir_check_page(dvnode, req->pages[i],
- req->actual_len))
- goto error_unlock;
+ ret = afs_dir_check(dvnode, req->nr_pages, req->actual_len);
+ if (ret < 0)
+ goto error_unlock;

// TODO: Trim excess pages

@@ -305,11 +376,6 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
afs_put_read(req);
_leave(" = %d", ret);
return ERR_PTR(ret);
-
-content_has_grown:
- up_write(&dvnode->validate_lock);
- afs_put_read(req);
- goto retry;
}

/*
@@ -415,6 +481,7 @@ static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
struct afs_read *req;
struct page *page;
unsigned blkoff, limit;
+ void __rcu **slot;
int ret;

_enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
@@ -438,9 +505,15 @@ static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);

/* Fetch the appropriate page from the directory and re-add it
- * to the LRU.
+ * to the LRU. We have all the pages pinned with an extra ref.
*/
- page = req->pages[blkoff / PAGE_SIZE];
+ rcu_read_lock();
+ page = NULL;
+ slot = radix_tree_lookup_slot(&dvnode->vfs_inode.i_mapping->i_pages,
+ blkoff / PAGE_SIZE);
+ if (slot)
+ page = radix_tree_deref_slot(slot);
+ rcu_read_unlock();
if (!page) {
ret = -EIO;
break;
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 7d4f26198573..e887a9b24f4f 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -148,7 +148,7 @@ int afs_open(struct inode *inode, struct file *file)

if (file->f_flags & O_TRUNC)
set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
-
+
file->private_data = af;
_leave(" = 0");
return 0;
@@ -185,24 +185,79 @@ int afs_release(struct inode *inode, struct file *file)
return 0;
}

+/*
+ * Make pages available as they're filled. This function may not sleep.
+ */
+static void afs_readpages_page_done(const struct iov_iter *iter,
+ const struct bio_vec *bv)
+{
+ struct page *page = bv->bv_page;
+ struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
+ struct afs_read *req = container_of(iter, struct afs_read, iter);
+
+ SetPageUptodate(page);
+
+ if (0 && afs_vnode_cache(vnode))
+ SetPageFsCache(page);
+ unlock_page(page);
+ put_page(page);
+ req->done_pages++;
+}
+
+/*
+ * Unlock the pages we were reading into. We've got locks and refs on the
+ * first nr_pages pages.
+ */
+static void afs_file_read_cleanup(struct afs_read *req)
+{
+ struct radix_tree_iter iter;
+ struct address_space *mapping = req->iter.mapping;
+ struct page *page;
+ pgoff_t index = req->pos >> PAGE_SHIFT;
+ void **slot;
+
+ _enter("%lu,%u,%u,%zu",
+ index, req->done_pages, req->nr_pages, iov_iter_count(&req->iter));
+
+ if (likely(req->done_pages >= req->nr_pages))
+ return;
+
+ rcu_read_lock();
+ radix_tree_for_each_contig(slot, &mapping->i_pages, &iter, index) {
+ page = radix_tree_deref_slot(slot);
+ if (unlikely(!page))
+ continue;
+
+ BUG_ON(radix_tree_exception(page));
+ BUG_ON(PageCompound(page));
+ BUG_ON(page != *slot);
+ BUG_ON(page->mapping != req->iter.mapping);
+
+ if (req->error)
+ SetPageError(page);
+ unlock_page(page);
+ put_page(page);
+ req->done_pages++;
+ if (req->done_pages >= req->nr_pages)
+ break;
+ }
+
+ rcu_read_unlock();
+}
+
/*
* Dispose of a ref to a read record.
*/
void afs_put_read(struct afs_read *req)
{
- int i;
-
if (refcount_dec_and_test(&req->usage)) {
- for (i = 0; i < req->nr_pages; i++)
- if (req->pages[i])
- put_page(req->pages[i]);
- if (req->pages != req->array)
- kfree(req->pages);
+ if (req->cleanup)
+ req->cleanup(req);
kfree(req);
}
}

-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
/*
* deal with notification that a page was read from the cache
*/
@@ -257,6 +312,22 @@ int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *de
return ret;
}

+/*
+ * Clear the trailer after a short read.
+ */
+static void afs_clear_after_read(struct afs_vnode *vnode, struct afs_read *req,
+ bool catch_page_done)
+{
+ if (req->actual_len >= req->len)
+ return;
+ iov_iter_mapping(&req->iter, READ, vnode->vfs_inode.i_mapping,
+ req->pos + req->actual_len,
+ req->len - req->actual_len);
+ if (catch_page_done)
+ req->iter.page_done = afs_readpages_page_done;
+ iov_iter_zero(req->len - req->actual_len, &req->iter);
+}
+
/*
* read page from file, directory or symlink, given a key to use
*/
@@ -277,7 +348,7 @@ int afs_page_filler(void *data, struct page *page)
goto error;

/* is it cached? */
-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
ret = fscache_read_or_alloc_page(vnode->cache,
page,
afs_file_readpage_read_complete,
@@ -301,8 +372,7 @@ int afs_page_filler(void *data, struct page *page)
_debug("cache said ENOBUFS");
default:
go_on:
- req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *),
- GFP_KERNEL);
+ req = kzalloc(sizeof(struct afs_read), GFP_KERNEL);
if (!req)
goto enomem;

@@ -314,10 +384,11 @@ int afs_page_filler(void *data, struct page *page)
req->pos = (loff_t)page->index << PAGE_SHIFT;
req->len = PAGE_SIZE;
req->nr_pages = 1;
- req->pages = req->array;
- req->pages[0] = page;
get_page(page);

+ iov_iter_mapping(&req->iter, READ, page->mapping,
+ (loff_t)page->index << PAGE_SHIFT, PAGE_SIZE);
+
/* read the contents of the file from the server into the
* page */
ret = afs_fetch_data(vnode, key, req);
@@ -331,11 +402,6 @@ int afs_page_filler(void *data, struct page *page)
ret = -ESTALE;
}

-#ifdef CONFIG_AFS_FSCACHE
- fscache_uncache_page(vnode->cache, page);
-#endif
- BUG_ON(PageFsCache(page));
-
if (ret == -EINTR ||
ret == -ENOMEM ||
ret == -ERESTARTSYS ||
@@ -344,10 +410,11 @@ int afs_page_filler(void *data, struct page *page)
goto io_error;
}

+ afs_clear_after_read(vnode, req, false);
SetPageUptodate(page);

/* send the page to the cache */
-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
if (PageFsCache(page) &&
fscache_write_page(vnode->cache, page, vnode->status.size,
GFP_KERNEL) != 0) {
@@ -398,31 +465,39 @@ static int afs_readpage(struct file *file, struct page *page)
return ret;
}

+#if 0
/*
- * Make pages available as they're filled.
+ * Allow writing to a page to take place. This function may not sleep.
*/
-static void afs_readpages_page_done(struct afs_call *call, struct afs_read *req)
+static void afs_clear_page_fscache_mark(const struct iov_iter *iter,
+ struct page *page)
{
-#ifdef CONFIG_AFS_FSCACHE
- struct afs_vnode *vnode = call->reply[0];
-#endif
- struct page *page = req->pages[req->index];
+ ClearPageFsCache(page);
+}

- req->pages[req->index] = NULL;
- SetPageUptodate(page);
+static void afs_fscache_write_done(struct fscache_cookie *cookie,
+ struct iov_iter *iter)
+{
+ struct afs_read *req = container_of(iter, struct afs_read, iter);
+
+ afs_put_read(req);
+}
+
+/*
+ * Write the read data to the cache.
+ */
+static void afs_readpages_write_to_cache(struct afs_read *req)
+{
+ struct afs_vnode *vnode = AFS_FS_I(req->iter.mapping->host);

- /* send the page to the cache */
-#ifdef CONFIG_AFS_FSCACHE
- if (PageFsCache(page) &&
- fscache_write_page(vnode->cache, page, vnode->status.size,
- GFP_KERNEL) != 0) {
- fscache_uncache_page(vnode->cache, page);
- BUG_ON(PageFsCache(page));
+ if (afs_vnode_cache(vnode)) {
+ req->iter.page_done = afs_clear_page_fscache_mark;
+ fscache_write(vnode->cache, &req->iter, req->pos,
+ req->file_size, GFP_KERNEL,
+ afs_fscache_write_done);
}
-#endif
- unlock_page(page);
- put_page(page);
}
+#endif

/*
* Read a contiguous set of pages.
@@ -436,7 +511,7 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
struct page *first, *page;
struct key *key = afs_file_key(file);
pgoff_t index;
- int ret, n, i;
+ int ret, n;

/* Count the number of contiguous pages at the front of the list. Note
* that the list goes prev-wards rather than next-wards.
@@ -452,20 +527,17 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
n++;
}

- req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *) * n,
- GFP_NOFS);
+ req = kzalloc(sizeof(struct afs_read), GFP_NOFS);
if (!req)
return -ENOMEM;

refcount_set(&req->usage, 1);
- req->page_done = afs_readpages_page_done;
+ req->cleanup = afs_file_read_cleanup;
req->pos = first->index;
req->pos <<= PAGE_SHIFT;
- req->pages = req->array;

- /* Transfer the pages to the request. We add them in until one fails
- * to add to the LRU and then we stop (as that'll make a hole in the
- * contiguous run.
+ /* Add pages to the LRU until it fails. We keep the pages ref'd and
+ * locked until the read is complete.
*
* Note that it's possible for the file size to change whilst we're
* doing this, but we rely on the server returning less than we asked
@@ -478,15 +550,11 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
index = page->index;
if (add_to_page_cache_lru(page, mapping, index,
readahead_gfp_mask(mapping))) {
-#ifdef CONFIG_AFS_FSCACHE
- fscache_uncache_page(vnode->cache, page);
-#endif
put_page(page);
break;
}

- req->pages[req->nr_pages++] = page;
- req->len += PAGE_SIZE;
+ req->nr_pages++;
} while (req->nr_pages < n);

if (req->nr_pages == 0) {
@@ -494,33 +562,26 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
return 0;
}

+ req->len = req->nr_pages * PAGE_SIZE;
+ iov_iter_mapping(&req->iter, READ, file->f_mapping, req->pos, req->len);
+ req->iter.page_done = afs_readpages_page_done;
+
ret = afs_fetch_data(vnode, key, req);
if (ret < 0)
goto error;

- task_io_account_read(PAGE_SIZE * req->nr_pages);
- afs_put_read(req);
+ afs_clear_after_read(vnode, req, true);
+ task_io_account_read(req->len);
return 0;

error:
if (ret == -ENOENT) {
- _debug("got NOENT from server"
- " - marking file deleted and stale");
+ _debug("got NOENT from server - marking file deleted and stale");
set_bit(AFS_VNODE_DELETED, &vnode->flags);
ret = -ESTALE;
}

- for (i = 0; i < req->nr_pages; i++) {
- page = req->pages[i];
- if (page) {
-#ifdef CONFIG_AFS_FSCACHE
- fscache_uncache_page(vnode->cache, page);
-#endif
- SetPageError(page);
- unlock_page(page);
- }
- }
-
+ req->error = true;
afs_put_read(req);
return ret;
}
@@ -547,7 +608,7 @@ static int afs_readpages(struct file *file, struct address_space *mapping,
}

/* attempt to read as many of the pages as possible */
-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
ret = fscache_read_or_alloc_pages(vnode->cache,
mapping,
pages,
@@ -605,7 +666,7 @@ static void afs_invalidatepage(struct page *page, unsigned int offset,

/* we clean up only if the entire page is being invalidated */
if (offset == 0 && length == PAGE_SIZE) {
-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
if (PageFsCache(page)) {
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
fscache_wait_on_page_write(vnode->cache, page);
@@ -640,7 +701,7 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags)

/* deny if page is being written to the cache and the caller hasn't
* elected to wait */
-#ifdef CONFIG_AFS_FSCACHE
+#if 0 //def CONFIG_AFS_FSCACHE
if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) {
_leave(" = F [cache busy]");
return 0;
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index d9a5815945dc..f0cef8e7b1af 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -20,12 +20,6 @@

static const struct afs_fid afs_zero_fid;

-/*
- * We need somewhere to discard into in case the server helpfully returns more
- * than we asked for in FS.FetchData{,64}.
- */
-static u8 afs_discard_buffer[64];
-
static inline void afs_use_fs_server(struct afs_call *call, struct afs_cb_interest *cbi)
{
call->cbi = afs_get_cb_interest(cbi);
@@ -468,115 +462,82 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
struct afs_vnode *vnode = call->reply[0];
struct afs_read *req = call->reply[2];
const __be32 *bp;
- unsigned int size;
- void *buffer;
int ret;

- _enter("{%u,%zu/%u;%llu/%llu}",
- call->unmarshall, call->offset, call->count,
- req->remain, req->actual_len);
+ _enter("{%u,%zu/%llu}",
+ call->unmarshall, iov_iter_count(&call->iter), req->actual_len);

switch (call->unmarshall) {
case 0:
req->actual_len = 0;
- call->offset = 0;
call->unmarshall++;
if (call->operation_ID != FSFETCHDATA64) {
call->unmarshall++;
goto no_msw;
}
+ afs_extract_to_tmp(call);

/* extract the upper part of the returned data length of an
- * FSFETCHDATA64 op (which should always be 0 using this
- * client) */
+ * FSFETCHDATA64 op.
+ */
case 1:
_debug("extract data length (MSW)");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

req->actual_len = ntohl(call->tmp);
req->actual_len <<= 32;
- call->offset = 0;
call->unmarshall++;
-
no_msw:
+ afs_extract_to_tmp(call);
+
/* extract the returned data length */
case 2:
_debug("extract data length");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

req->actual_len |= ntohl(call->tmp);
_debug("DATA length: %llu", req->actual_len);

- req->remain = req->actual_len;
- call->offset = req->pos & (PAGE_SIZE - 1);
- req->index = 0;
if (req->actual_len == 0)
goto no_more_data;
call->unmarshall++;
-
- begin_page:
- ASSERTCMP(req->index, <, req->nr_pages);
- if (req->remain > PAGE_SIZE - call->offset)
- size = PAGE_SIZE - call->offset;
- else
- size = req->remain;
- call->count = call->offset + size;
- ASSERTCMP(call->count, <=, PAGE_SIZE);
- req->remain -= size;
+ call->_iter = &req->iter;
+ iov_iter_truncate(&req->iter, req->actual_len);

/* extract the returned data */
case 3:
- _debug("extract data %llu/%llu %zu/%u",
- req->remain, req->actual_len, call->offset, call->count);
+ _debug("extract data %zu/%llu",
+ iov_iter_count(&call->iter), req->actual_len);

- buffer = kmap(req->pages[req->index]);
- ret = afs_extract_data(call, buffer, call->count, true);
- kunmap(req->pages[req->index]);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
- if (call->offset == PAGE_SIZE) {
- if (req->page_done)
- req->page_done(call, req);
- req->index++;
- if (req->remain > 0) {
- call->offset = 0;
- if (req->index >= req->nr_pages) {
- call->unmarshall = 4;
- goto begin_discard;
- }
- goto begin_page;
- }
- }
- goto no_more_data;
+
+ call->_iter = &call->iter;
+ if (req->actual_len <= req->len)
+ goto no_more_data;

/* Discard any excess data the server gave us */
- begin_discard:
+ iov_iter_discard(&call->iter, READ, req->actual_len - req->len);
case 4:
- size = min_t(loff_t, sizeof(afs_discard_buffer), req->remain);
- call->count = size;
- _debug("extract discard %llu/%llu %zu/%u",
- req->remain, req->actual_len, call->offset, call->count);
-
- call->offset = 0;
- ret = afs_extract_data(call, afs_discard_buffer, call->count, true);
- req->remain -= call->offset;
+ _debug("extract discard %zu/%llu",
+ iov_iter_count(&call->iter), req->actual_len - req->len);
+
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
- if (req->remain > 0)
- goto begin_discard;

no_more_data:
- call->offset = 0;
call->unmarshall = 5;
+ afs_extract_to_buf(call, (21 + 3 + 6) * 4);

/* extract the metadata */
case 5:
- ret = afs_extract_data(call, call->buffer,
- (21 + 3 + 6) * 4, false);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

@@ -589,22 +550,12 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
if (call->reply[1])
xdr_decode_AFSVolSync(&bp, call->reply[1]);

- call->offset = 0;
call->unmarshall++;

case 6:
break;
}

- for (; req->index < req->nr_pages; req->index++) {
- if (call->count < PAGE_SIZE)
- zero_user_segment(req->pages[req->index],
- call->count, PAGE_SIZE);
- if (req->page_done)
- req->page_done(call, req);
- call->count = 0;
- }
-
_leave(" = 0 [done]");
return 0;
}
@@ -700,6 +651,7 @@ int afs_fs_fetch_data(struct afs_fs_cursor *fc, struct afs_read *req)
call->reply[1] = NULL; /* volsync */
call->reply[2] = req;
call->expected_version = vnode->status.data_version;
+ req->call_debug_id = call->debug_id;

/* marshall the parameters */
bp = call->request;
@@ -1598,31 +1550,31 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
{
const __be32 *bp;
char *p;
+ u32 size;
int ret;

_enter("{%u}", call->unmarshall);

switch (call->unmarshall) {
case 0:
- call->offset = 0;
call->unmarshall++;
+ afs_extract_to_buf(call, 12 * 4);

/* extract the returned status record */
case 1:
_debug("extract status");
- ret = afs_extract_data(call, call->buffer,
- 12 * 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

bp = call->buffer;
xdr_decode_AFSFetchVolumeStatus(&bp, call->reply[1]);
- call->offset = 0;
call->unmarshall++;
+ afs_extract_to_tmp(call);

/* extract the volume name length */
case 2:
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -1631,46 +1583,26 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
if (call->count >= AFSNAMEMAX)
return afs_protocol_error(call, -EBADMSG,
afs_eproto_volname_len);
- call->offset = 0;
+ size = (call->count + 3) & ~3; /* It's padded */
+ afs_extract_begin(call, call->reply[2], size);
call->unmarshall++;

/* extract the volume name */
case 3:
_debug("extract volname");
- if (call->count > 0) {
- ret = afs_extract_data(call, call->reply[2],
- call->count, true);
- if (ret < 0)
- return ret;
- }
+ ret = afs_extract_data(call, true);
+ if (ret < 0)
+ return ret;

p = call->reply[2];
p[call->count] = 0;
_debug("volname '%s'", p);
-
- call->offset = 0;
- call->unmarshall++;
-
- /* extract the volume name padding */
- if ((call->count & 3) == 0) {
- call->unmarshall++;
- goto no_volname_padding;
- }
- call->count = 4 - (call->count & 3);
-
- case 4:
- ret = afs_extract_data(call, call->buffer,
- call->count, true);
- if (ret < 0)
- return ret;
-
- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;
- no_volname_padding:

/* extract the offline message length */
- case 5:
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ case 4:
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -1679,46 +1611,27 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
if (call->count >= AFSNAMEMAX)
return afs_protocol_error(call, -EBADMSG,
afs_eproto_offline_msg_len);
- call->offset = 0;
+ size = (call->count + 3) & ~3; /* It's padded */
+ afs_extract_begin(call, call->reply[2], size);
call->unmarshall++;

/* extract the offline message */
- case 6:
+ case 5:
_debug("extract offline");
- if (call->count > 0) {
- ret = afs_extract_data(call, call->reply[2],
- call->count, true);
- if (ret < 0)
- return ret;
- }
+ ret = afs_extract_data(call, true);
+ if (ret < 0)
+ return ret;

p = call->reply[2];
p[call->count] = 0;
_debug("offline '%s'", p);

- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

- /* extract the offline message padding */
- if ((call->count & 3) == 0) {
- call->unmarshall++;
- goto no_offline_padding;
- }
- call->count = 4 - (call->count & 3);
-
- case 7:
- ret = afs_extract_data(call, call->buffer,
- call->count, true);
- if (ret < 0)
- return ret;
-
- call->offset = 0;
- call->unmarshall++;
- no_offline_padding:
-
/* extract the message of the day length */
- case 8:
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ case 6:
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -1727,38 +1640,24 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
if (call->count >= AFSNAMEMAX)
return afs_protocol_error(call, -EBADMSG,
afs_eproto_motd_len);
- call->offset = 0;
+ size = (call->count + 3) & ~3; /* It's padded */
+ afs_extract_begin(call, call->reply[2], size);
call->unmarshall++;

/* extract the message of the day */
- case 9:
+ case 7:
_debug("extract motd");
- if (call->count > 0) {
- ret = afs_extract_data(call, call->reply[2],
- call->count, true);
- if (ret < 0)
- return ret;
- }
+ ret = afs_extract_data(call, false);
+ if (ret < 0)
+ return ret;

p = call->reply[2];
p[call->count] = 0;
_debug("motd '%s'", p);

- call->offset = 0;
call->unmarshall++;

- /* extract the message of the day padding */
- call->count = (4 - (call->count & 3)) & 3;
-
- case 10:
- ret = afs_extract_data(call, call->buffer,
- call->count, false);
- if (ret < 0)
- return ret;
-
- call->offset = 0;
- call->unmarshall++;
- case 11:
+ case 8:
break;
}

@@ -2024,19 +1923,16 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call)
u32 count;
int ret;

- _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);
+ _enter("{%u,%zu}", call->unmarshall, iov_iter_count(&call->iter));

-again:
switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

/* Extract the capabilities word count */
case 1:
- ret = afs_extract_data(call, &call->tmp,
- 1 * sizeof(__be32),
- true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -2044,24 +1940,17 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call)

call->count = count;
call->count2 = count;
- call->offset = 0;
+ iov_iter_discard(&call->iter, READ, count * sizeof(__be32));
call->unmarshall++;

/* Extract capabilities words */
case 2:
- count = min(call->count, 16U);
- ret = afs_extract_data(call, call->buffer,
- count * sizeof(__be32),
- call->count > 16);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

/* TODO: Examine capabilities */

- call->count -= count;
- if (call->count > 0)
- goto again;
- call->offset = 0;
call->unmarshall++;
break;
}
@@ -2215,13 +2104,13 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)

switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

/* Extract the file status count and array in two steps */
case 1:
_debug("extract status count");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -2234,11 +2123,11 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
call->count = 0;
call->unmarshall++;
more_counts:
- call->offset = 0;
+ afs_extract_to_buf(call, 21 * sizeof(__be32));

case 2:
_debug("extract status array %u", call->count);
- ret = afs_extract_data(call, call->buffer, 21 * 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -2256,12 +2145,12 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)

call->count = 0;
call->unmarshall++;
- call->offset = 0;
+ afs_extract_to_tmp(call);

/* Extract the callback count and array in two steps */
case 3:
_debug("extract CB count");
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -2273,11 +2162,11 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
call->count = 0;
call->unmarshall++;
more_cbs:
- call->offset = 0;
+ afs_extract_to_buf(call, 3 * sizeof(__be32));

case 4:
_debug("extract CB array");
- ret = afs_extract_data(call, call->buffer, 3 * 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -2294,11 +2183,11 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
if (call->count < call->count2)
goto more_cbs;

- call->offset = 0;
+ afs_extract_to_buf(call, 6 * sizeof(__be32));
call->unmarshall++;

case 5:
- ret = afs_extract_data(call, call->buffer, 6 * 4, false);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

@@ -2306,7 +2195,6 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
if (call->reply[3])
xdr_decode_AFSVolSync(&bp, call->reply[3]);

- call->offset = 0;
call->unmarshall++;

case 6:
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 457a8f76b6a2..997ab8350dfe 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -96,11 +96,16 @@ struct afs_call {
struct afs_cb_interest *cbi; /* Callback interest for server used */
void *request; /* request data (first part) */
struct address_space *mapping; /* Pages being written from */
+ struct iov_iter iter; /* Buffer iterator */
+ struct iov_iter *_iter; /* Iterator currently in use */
+ union { /* Convenience for ->iter */
+ struct kvec kvec[1];
+ struct bio_vec bvec[1];
+ };
void *buffer; /* reply receive buffer */
void *reply[4]; /* Where to put the reply */
pgoff_t first; /* first page in mapping to deal with */
pgoff_t last; /* last page in mapping to deal with */
- size_t offset; /* offset into received data store */
atomic_t usage;
enum afs_call_state state;
spinlock_t state_lock;
@@ -177,15 +182,15 @@ struct afs_read {
loff_t pos; /* Where to start reading */
loff_t len; /* How much we're asking for */
loff_t actual_len; /* How much we're actually getting */
- loff_t remain; /* Amount remaining */
loff_t file_size; /* File size returned by server */
afs_dataversion_t data_version; /* Version number returned by server */
refcount_t usage;
- unsigned int index; /* Which page we're reading into */
unsigned int nr_pages;
- void (*page_done)(struct afs_call *, struct afs_read *);
- struct page **pages;
- struct page *array[];
+ unsigned int done_pages;
+ bool error;
+ unsigned int call_debug_id;
+ void (*cleanup)(struct afs_read *);
+ struct iov_iter iter; /* Buffer */
};

/*
@@ -548,6 +553,15 @@ struct afs_vnode {
afs_callback_type_t cb_type; /* type of callback */
};

+static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
+{
+#ifdef CONFIG_AFS_FSCACHE
+ return vnode->cache;
+#else
+ return NULL;
+#endif
+}
+
/*
* cached security record for one user's attempt to access a vnode
*/
@@ -928,12 +942,34 @@ extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_send_empty_reply(struct afs_call *);
extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
-extern int afs_extract_data(struct afs_call *, void *, size_t, bool);
+extern int afs_extract_data(struct afs_call *, bool);
extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause);

+static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
+{
+ call->kvec[0].iov_base = buf;
+ call->kvec[0].iov_len = size;
+ iov_iter_kvec(&call->iter, READ, call->kvec, 1, size);
+}
+
+static inline void afs_extract_to_tmp(struct afs_call *call)
+{
+ afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
+}
+
+static inline void afs_extract_discard(struct afs_call *call, size_t size)
+{
+ iov_iter_discard(&call->iter, READ, size);
+}
+
+static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
+{
+ afs_extract_begin(call, call->buffer, size);
+}
+
static inline int afs_transfer_reply(struct afs_call *call)
{
- return afs_extract_data(call, call->buffer, call->reply_max, false);
+ return afs_extract_data(call, false);
}

static inline bool afs_check_call_state(struct afs_call *call,
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 20199f2b2c31..966e30f30cbb 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -143,6 +143,7 @@ static struct afs_call *afs_alloc_call(struct afs_net *net,
INIT_WORK(&call->async_work, afs_process_async_call);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->state_lock);
+ call->_iter = &call->iter;

o = atomic_inc_return(&net->nr_outstanding_calls);
trace_afs_call(call, afs_call_trace_alloc, 1, o,
@@ -233,6 +234,7 @@ struct afs_call *afs_alloc_flat_call(struct afs_net *net,
goto nomem_free;
}

+ afs_extract_to_buf(call, call->reply_max);
call->operation_ID = type->op;
init_waitqueue_head(&call->waitq);
return call;
@@ -465,14 +467,12 @@ static void afs_deliver_to_call(struct afs_call *call)
state == AFS_CALL_SV_AWAIT_ACK
) {
if (state == AFS_CALL_SV_AWAIT_ACK) {
- struct iov_iter iter;
-
- iov_iter_kvec(&iter, READ, NULL, 0, 0);
+ iov_iter_kvec(&call->iter, READ, NULL, 0, 0);
ret = rxrpc_kernel_recv_data(call->net->socket,
- call->rxcall, &iter, false,
- &remote_abort,
+ call->rxcall, &call->iter,
+ false, &remote_abort,
&call->service_id);
- trace_afs_recv_data(call, 0, 0, false, ret);
+ trace_afs_receive_data(call, &call->iter, false, ret);

if (ret == -EINPROGRESS || ret == -EAGAIN)
return;
@@ -516,7 +516,7 @@ static void afs_deliver_to_call(struct afs_call *call)
if (state != AFS_CALL_CL_AWAIT_REPLY)
abort_code = RXGEN_SS_UNMARSHAL;
rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
- abort_code, -EBADMSG, "KUM");
+ abort_code, ret, "KUM");
goto local_abort;
}
}
@@ -729,6 +729,7 @@ void afs_charge_preallocation(struct work_struct *work)
call->async = true;
call->state = AFS_CALL_SV_AWAIT_OP_ID;
init_waitqueue_head(&call->waitq);
+ afs_extract_to_tmp(call);
}

if (rxrpc_kernel_charge_accept(net->socket,
@@ -774,18 +775,15 @@ static int afs_deliver_cm_op_id(struct afs_call *call)
{
int ret;

- _enter("{%zu}", call->offset);
-
- ASSERTCMP(call->offset, <, 4);
+ _enter("{%zu}", iov_iter_count(call->_iter));

/* the operation ID forms the first four bytes of the request data */
- ret = afs_extract_data(call, &call->tmp, 4, true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

call->operation_ID = ntohl(call->tmp);
afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
- call->offset = 0;

/* ask the cache manager to route the call (it'll change the call type
* if successful) */
@@ -889,30 +887,19 @@ void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
/*
* Extract a piece of data from the received data socket buffers.
*/
-int afs_extract_data(struct afs_call *call, void *buf, size_t count,
- bool want_more)
+int afs_extract_data(struct afs_call *call, bool want_more)
{
struct afs_net *net = call->net;
- struct iov_iter iter;
- struct kvec iov;
+ struct iov_iter *iter = call->_iter;
enum afs_call_state state;
u32 remote_abort = 0;
int ret;

- _enter("{%s,%zu},,%zu,%d",
- call->type->name, call->offset, count, want_more);
-
- ASSERTCMP(call->offset, <=, count);
-
- iov.iov_base = buf + call->offset;
- iov.iov_len = count - call->offset;
- iov_iter_kvec(&iter, READ, &iov, 1, count - call->offset);
+ _enter("{%s,%zu},%d", call->type->name, iov_iter_count(iter), want_more);

- ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, &iter,
+ ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
want_more, &remote_abort,
&call->service_id);
- call->offset += (count - call->offset) - iov_iter_count(&iter);
- trace_afs_recv_data(call, count, call->offset, want_more, ret);
if (ret == 0 || ret == -EAGAIN)
return ret;

diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c
index d0f95c4ab05e..e18c51742daa 100644
--- a/fs/afs/vlclient.c
+++ b/fs/afs/vlclient.c
@@ -187,19 +187,18 @@ static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
u32 uniquifier, nentries, count;
int i, ret;

- _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);
+ _enter("{%u,%zu/%u}",
+ call->unmarshall, iov_iter_count(call->_iter), call->count);

-again:
switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_buf(call,
+ sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32));
call->unmarshall++;

/* Extract the returned uuid, uniquifier, nentries and blkaddrs size */
case 1:
- ret = afs_extract_data(call, call->buffer,
- sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32),
- true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -216,28 +215,28 @@ static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
call->reply[0] = alist;
call->count = count;
call->count2 = nentries;
- call->offset = 0;
call->unmarshall++;

+ more_entries:
+ count = min(call->count, 4U);
+ afs_extract_to_buf(call, count * sizeof(__be32));
+
/* Extract entries */
case 2:
- count = min(call->count, 4U);
- ret = afs_extract_data(call, call->buffer,
- count * sizeof(__be32),
- call->count > 4);
+ ret = afs_extract_data(call, call->count > 4);
if (ret < 0)
return ret;

alist = call->reply[0];
bp = call->buffer;
+ count = min(call->count, 4U);
for (i = 0; i < count; i++)
if (alist->nr_addrs < call->count2)
afs_merge_fs_addr4(alist, *bp++, AFS_FS_PORT);

call->count -= count;
if (call->count > 0)
- goto again;
- call->offset = 0;
+ goto more_entries;
call->unmarshall++;
break;
}
@@ -318,44 +317,35 @@ static int afs_deliver_vl_get_capabilities(struct afs_call *call)
u32 count;
int ret;

- _enter("{%u,%zu/%u}", call->unmarshall, call->offset, call->count);
+ _enter("{%u,%zu/%u}",
+ call->unmarshall, iov_iter_count(call->_iter), call->count);

-again:
switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_tmp(call);
call->unmarshall++;

/* Extract the capabilities word count */
case 1:
- ret = afs_extract_data(call, &call->tmp,
- 1 * sizeof(__be32),
- true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

count = ntohl(call->tmp);
-
call->count = count;
call->count2 = count;
- call->offset = 0;
+
call->unmarshall++;
+ afs_extract_discard(call, count * sizeof(__be32));

/* Extract capabilities words */
case 2:
- count = min(call->count, 16U);
- ret = afs_extract_data(call, call->buffer,
- count * sizeof(__be32),
- call->count > 16);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;

/* TODO: Examine capabilities */

- call->count -= count;
- if (call->count > 0)
- goto again;
- call->offset = 0;
call->unmarshall++;
break;
}
@@ -426,22 +416,19 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
u32 uniquifier, size;
int ret;

- _enter("{%u,%zu/%u,%u}", call->unmarshall, call->offset, call->count, call->count2);
+ _enter("{%u,%zu,%u}",
+ call->unmarshall, iov_iter_count(call->_iter), call->count2);

-again:
switch (call->unmarshall) {
case 0:
- call->offset = 0;
+ afs_extract_to_buf(call, sizeof(uuid_t) + 3 * sizeof(__be32));
call->unmarshall = 1;

/* Extract the returned uuid, uniquifier, fsEndpoints count and
* either the first fsEndpoint type or the volEndpoints
* count if there are no fsEndpoints. */
case 1:
- ret = afs_extract_data(call, call->buffer,
- sizeof(uuid_t) +
- 3 * sizeof(__be32),
- true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -459,15 +446,11 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
return -ENOMEM;
alist->version = uniquifier;
call->reply[0] = alist;
- call->offset = 0;

if (call->count == 0)
goto extract_volendpoints;

- call->unmarshall = 2;
-
- /* Extract fsEndpoints[] entries */
- case 2:
+ next_fsendpoint:
switch (call->count2) {
case YFS_ENDPOINT_IPV4:
size = sizeof(__be32) * (1 + 1 + 1);
@@ -481,7 +464,12 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
}

size += sizeof(__be32);
- ret = afs_extract_data(call, call->buffer, size, true);
+ afs_extract_to_buf(call, size);
+ call->unmarshall = 2;
+
+ /* Extract fsEndpoints[] entries */
+ case 2:
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -512,10 +500,9 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
*/
call->count2 = ntohl(*bp++);

- call->offset = 0;
call->count--;
if (call->count > 0)
- goto again;
+ goto next_fsendpoint;

extract_volendpoints:
/* Extract the list of volEndpoints. */
@@ -526,6 +513,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
return afs_protocol_error(call, -EBADMSG,
afs_eproto_yvl_vlendpt_type);

+ afs_extract_to_buf(call, 1 * sizeof(__be32));
call->unmarshall = 3;

/* Extract the type of volEndpoints[0]. Normally we would
@@ -533,17 +521,14 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
* data of the current one, but this is the first...
*/
case 3:
- ret = afs_extract_data(call, call->buffer, sizeof(__be32), true);
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

bp = call->buffer;
- call->count2 = ntohl(*bp++);
- call->offset = 0;
- call->unmarshall = 4;

- /* Extract volEndpoints[] entries */
- case 4:
+ next_volendpoint:
+ call->count2 = ntohl(*bp++);
switch (call->count2) {
case YFS_ENDPOINT_IPV4:
size = sizeof(__be32) * (1 + 1 + 1);
@@ -557,8 +542,13 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
}

if (call->count > 1)
- size += sizeof(__be32);
- ret = afs_extract_data(call, call->buffer, size, true);
+ size += sizeof(__be32); /* Get next type too */
+ afs_extract_to_buf(call, size);
+ call->unmarshall = 4;
+
+ /* Extract volEndpoints[] entries */
+ case 4:
+ ret = afs_extract_data(call, true);
if (ret < 0)
return ret;

@@ -584,19 +574,17 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
/* Got either the type of the next entry or the count of
* volEndpoints if no more fsEndpoints.
*/
- call->offset = 0;
call->count--;
- if (call->count > 0) {
- call->count2 = ntohl(*bp++);
- goto again;
- }
+ if (call->count > 0)
+ goto next_volendpoint;

end:
+ afs_extract_discard(call, 0);
call->unmarshall = 5;

/* Done */
case 5:
- ret = afs_extract_data(call, call->buffer, 0, false);
+ ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
call->unmarshall = 6;
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 19c04caf3c01..d07e7f29f50a 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -37,8 +37,7 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,

_enter(",,%llu", (unsigned long long)pos);

- req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *),
- GFP_KERNEL);
+ req = kzalloc(sizeof(struct afs_read), GFP_KERNEL);
if (!req)
return -ENOMEM;

@@ -46,9 +45,8 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
req->pos = pos;
req->len = len;
req->nr_pages = 1;
- req->pages = req->array;
- req->pages[0] = page;
- get_page(page);
+ iov_iter_mapping(&req->iter, READ, vnode->vfs_inode.i_mapping,
+ pos, len);

ret = afs_fetch_data(vnode, key, req);
afs_put_read(req);
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 84b90a79d75a..d99294c75e9a 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -218,6 +218,9 @@ extern int __fscache_read_or_alloc_pages(struct fscache_cookie *,
gfp_t);
extern int __fscache_alloc_page(struct fscache_cookie *, struct page *, gfp_t);
extern int __fscache_write_page(struct fscache_cookie *, struct page *, loff_t, gfp_t);
+extern int __fscache_write(struct fscache_cookie *, struct iov_iter *,
+ loff_t, loff_t, gfp_t,
+ void (*)(struct fscache_cookie *, struct iov_iter *));
extern void __fscache_uncache_page(struct fscache_cookie *, struct page *);
extern bool __fscache_check_page_write(struct fscache_cookie *, struct page *);
extern void __fscache_wait_on_page_write(struct fscache_cookie *, struct page *);
@@ -655,6 +658,34 @@ void fscache_readpages_cancel(struct fscache_cookie *cookie,
__fscache_readpages_cancel(cookie, pages);
}

+/**
+ * fscache_write - Request storage of data in the cache
+ * @cookie: The cookie representing the cache object
+ * @iter: The data to store
+ * @pos: The position in the cached data
+ * @object_size: Updated size of object
+ * @gfp: The conditions under which memory allocation should be made
+ * @done: Called upon operation completion
+ *
+ * Request the data described by the iterator be written into the cache. This
+ * request may be ignored if insufficient space exists in the cache, in which
+ * case -ENOBUFS will be returned.
+ *
+ * See Documentation/filesystems/caching/netfs-api.txt for a complete
+ * description.
+ */
+static inline
+int fscache_write(struct fscache_cookie *cookie, struct iov_iter *iter,
+ loff_t pos, loff_t object_size, gfp_t gfp,
+ void (*done)(struct fscache_cookie *cookie,
+ struct iov_iter *iter))
+{
+ if (fscache_cookie_valid(cookie))
+ return __fscache_write(cookie, iter, pos, object_size, gfp, done);
+ else
+ return -ENOBUFS;
+}
+
/**
* fscache_write_page - Request storage of a page in the cache
* @cookie: The cookie representing the cache object
diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h
index 5c60ade2c7d8..5e0f8dcede26 100644
--- a/include/trace/events/afs.h
+++ b/include/trace/events/afs.h
@@ -207,17 +207,16 @@ afs_edit_dir_reasons;
#define EM(a, b) { a, b },
#define E_(a, b) { a, b }

-TRACE_EVENT(afs_recv_data,
- TP_PROTO(struct afs_call *call, unsigned count, unsigned offset,
+TRACE_EVENT(afs_receive_data,
+ TP_PROTO(struct afs_call *call, struct iov_iter *iter,
bool want_more, int ret),

- TP_ARGS(call, count, offset, want_more, ret),
+ TP_ARGS(call, iter, want_more, ret),

TP_STRUCT__entry(
+ __field(loff_t, remain )
__field(unsigned int, call )
__field(enum afs_call_state, state )
- __field(unsigned int, count )
- __field(unsigned int, offset )
__field(unsigned short, unmarshall )
__field(bool, want_more )
__field(int, ret )
@@ -227,17 +226,18 @@ TRACE_EVENT(afs_recv_data,
__entry->call = call->debug_id;
__entry->state = call->state;
__entry->unmarshall = call->unmarshall;
- __entry->count = count;
- __entry->offset = offset;
+ __entry->remain = iov_iter_count(iter);
__entry->want_more = want_more;
__entry->ret = ret;
),

- TP_printk("c=%08x s=%u u=%u %u/%u wm=%u ret=%d",
+ TP_printk("c=%08x r=%llu u=%u w=%u s=%u ret=%d",
__entry->call,
- __entry->state, __entry->unmarshall,
- __entry->offset, __entry->count,
- __entry->want_more, __entry->ret)
+ __entry->remain,
+ __entry->unmarshall,
+ __entry->want_more,
+ __entry->state,
+ __entry->ret)
);

TRACE_EVENT(afs_notify_call,
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  Last update: 2018-09-13 17:53    [W:0.213 / U:7.020 seconds]
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