#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
+#include <linux/pagevec.h>
#include <linux/buffer_head.h>
#include "volume.h"
#include "vnode.h"
#include <rxrpc/call.h>
#include "internal.h"
+#define list_to_page(head) (list_entry((head)->prev, struct page, lru))
+
#if 0
static int afs_file_open(struct inode *inode, struct file *file);
static int afs_file_release(struct inode *inode, struct file *file);
static int afs_file_readpage(struct file *file, struct page *page);
static void afs_file_invalidatepage(struct page *page, unsigned long offset);
static int afs_file_releasepage(struct page *page, gfp_t gfp_flags);
+static int afs_file_mmap(struct file * file, struct vm_area_struct * vma);
+
+#ifdef CONFIG_AFS_FSCACHE
+static int afs_file_readpages(struct file *filp, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages);
+static int afs_file_page_mkwrite(struct vm_area_struct *vma, struct page *page);
+#endif
struct inode_operations afs_file_inode_operations = {
.getattr = afs_inode_getattr,
};
-struct address_space_operations afs_fs_aops = {
+const struct file_operations afs_file_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_file_read,
+ .mmap = afs_file_mmap,
+ .sendfile = generic_file_sendfile,
+};
+
+const struct address_space_operations afs_fs_aops = {
.readpage = afs_file_readpage,
+#ifdef CONFIG_AFS_FSCACHE
+ .readpages = afs_file_readpages,
+#endif
.sync_page = block_sync_page,
.set_page_dirty = __set_page_dirty_nobuffers,
.releasepage = afs_file_releasepage,
.invalidatepage = afs_file_invalidatepage,
};
+static struct vm_operations_struct afs_fs_vm_operations = {
+ .nopage = filemap_nopage,
+ .populate = filemap_populate,
+#ifdef CONFIG_AFS_FSCACHE
+ .page_mkwrite = afs_file_page_mkwrite,
+#endif
+};
+
+/*****************************************************************************/
+/*
+ * set up a memory mapping on an AFS file
+ * - we set our own VMA ops so that we can catch the page becoming writable for
+ * userspace for shared-writable mmap
+ */
+static int afs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ _enter("");
+
+ file_accessed(file);
+ vma->vm_ops = &afs_fs_vm_operations;
+ return 0;
+
+} /* end afs_file_mmap() */
+
/*****************************************************************************/
/*
* deal with notification that a page was read from the cache
*/
-#ifdef AFS_CACHING_SUPPORT
-static void afs_file_readpage_read_complete(void *cookie_data,
- struct page *page,
+#ifdef CONFIG_AFS_FSCACHE
+static void afs_file_readpage_read_complete(struct page *page,
void *data,
int error)
{
- _enter("%p,%p,%p,%d", cookie_data, page, data, error);
+ _enter("%p,%p,%d", page, data, error);
- if (error)
- SetPageError(page);
- else
+ /* if the read completes with an error, we just unlock the page and let
+ * the VM reissue the readpage */
+ if (!error)
SetPageUptodate(page);
unlock_page(page);
/*
* deal with notification that a page was written to the cache
*/
-#ifdef AFS_CACHING_SUPPORT
-static void afs_file_readpage_write_complete(void *cookie_data,
- struct page *page,
+#ifdef CONFIG_AFS_FSCACHE
+static void afs_file_readpage_write_complete(struct page *page,
void *data,
int error)
{
- _enter("%p,%p,%p,%d", cookie_data, page, data, error);
+ _enter("%p,%p,%d", page, data, error);
- unlock_page(page);
+ /* note that the page has been written to the cache and can now be
+ * modified */
+ end_page_fs_misc(page);
} /* end afs_file_readpage_write_complete() */
#endif
static int afs_file_readpage(struct file *file, struct page *page)
{
struct afs_rxfs_fetch_descriptor desc;
-#ifdef AFS_CACHING_SUPPORT
- struct cachefs_page *pageio;
-#endif
struct afs_vnode *vnode;
struct inode *inode;
int ret;
inode = page->mapping->host;
- _enter("{%lu},{%lu}", inode->i_ino, page->index);
+ _enter("{%lu},%p{%lu}", inode->i_ino, page, page->index);
vnode = AFS_FS_I(inode);
if (vnode->flags & AFS_VNODE_DELETED)
goto error;
-#ifdef AFS_CACHING_SUPPORT
- ret = cachefs_page_get_private(page, &pageio, GFP_NOIO);
- if (ret < 0)
- goto error;
-
+#ifdef CONFIG_AFS_FSCACHE
/* is it cached? */
- ret = cachefs_read_or_alloc_page(vnode->cache,
+ ret = fscache_read_or_alloc_page(vnode->cache,
page,
afs_file_readpage_read_complete,
NULL,
#endif
switch (ret) {
- /* read BIO submitted and wb-journal entry found */
- case 1:
- BUG(); // TODO - handle wb-journal match
-
/* read BIO submitted (page in cache) */
case 0:
break;
- /* no page available in cache */
- case -ENOBUFS:
+ /* page not yet cached */
case -ENODATA:
+ _debug("cache said ENODATA");
+ goto go_on;
+
+ /* page will not be cached */
+ case -ENOBUFS:
+ _debug("cache said ENOBUFS");
default:
+ go_on:
desc.fid = vnode->fid;
desc.offset = page->index << PAGE_CACHE_SHIFT;
desc.size = min((size_t) (inode->i_size - desc.offset),
ret = afs_vnode_fetch_data(vnode, &desc);
kunmap(page);
if (ret < 0) {
- if (ret==-ENOENT) {
- _debug("got NOENT from server"
+ if (ret == -ENOENT) {
+ kdebug("got NOENT from server"
" - marking file deleted and stale");
vnode->flags |= AFS_VNODE_DELETED;
ret = -ESTALE;
}
-#ifdef AFS_CACHING_SUPPORT
- cachefs_uncache_page(vnode->cache, page);
+#ifdef CONFIG_AFS_FSCACHE
+ fscache_uncache_page(vnode->cache, page);
+ ClearPagePrivate(page);
#endif
goto error;
}
SetPageUptodate(page);
-#ifdef AFS_CACHING_SUPPORT
- if (cachefs_write_page(vnode->cache,
- page,
- afs_file_readpage_write_complete,
- NULL,
- GFP_KERNEL) != 0
- ) {
- cachefs_uncache_page(vnode->cache, page);
- unlock_page(page);
+ /* send the page to the cache */
+#ifdef CONFIG_AFS_FSCACHE
+ if (PagePrivate(page)) {
+ if (TestSetPageFsMisc(page))
+ BUG();
+ if (fscache_write_page(vnode->cache,
+ page,
+ afs_file_readpage_write_complete,
+ NULL,
+ GFP_KERNEL) != 0
+ ) {
+ fscache_uncache_page(vnode->cache, page);
+ ClearPagePrivate(page);
+ end_page_fs_misc(page);
+ }
}
-#else
- unlock_page(page);
#endif
+ unlock_page(page);
}
_leave(" = 0");
/*****************************************************************************/
/*
- * get a page cookie for the specified page
+ * read a set of pages
*/
-#ifdef AFS_CACHING_SUPPORT
-int afs_cache_get_page_cookie(struct page *page,
- struct cachefs_page **_page_cookie)
+#ifdef CONFIG_AFS_FSCACHE
+static int afs_file_readpages(struct file *filp, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
{
- int ret;
+ struct afs_vnode *vnode;
+#if 0
+ struct pagevec lru_pvec;
+ unsigned page_idx;
+#endif
+ int ret = 0;
- _enter("");
- ret = cachefs_page_get_private(page,_page_cookie, GFP_NOIO);
+ _enter(",{%lu},,%d", mapping->host->i_ino, nr_pages);
- _leave(" = %d", ret);
+ vnode = AFS_FS_I(mapping->host);
+ if (vnode->flags & AFS_VNODE_DELETED) {
+ _leave(" = -ESTALE");
+ return -ESTALE;
+ }
+
+ /* attempt to read as many of the pages as possible */
+ ret = fscache_read_or_alloc_pages(vnode->cache,
+ mapping,
+ pages,
+ &nr_pages,
+ afs_file_readpage_read_complete,
+ NULL,
+ mapping_gfp_mask(mapping));
+
+ switch (ret) {
+ /* all pages are being read from the cache */
+ case 0:
+ BUG_ON(!list_empty(pages));
+ BUG_ON(nr_pages != 0);
+ _leave(" = 0 [reading all]");
+ return 0;
+
+ /* there were pages that couldn't be read from the cache */
+ case -ENODATA:
+ case -ENOBUFS:
+ break;
+
+ /* other error */
+ default:
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ /* load the missing pages from the network */
+ ret = read_cache_pages(mapping, pages,
+ (void *) afs_file_readpage, NULL);
+
+ _leave(" = %d [netting]", ret);
return ret;
-} /* end afs_cache_get_page_cookie() */
+
+} /* end afs_file_readpages() */
#endif
/*****************************************************************************/
*/
static void afs_file_invalidatepage(struct page *page, unsigned long offset)
{
- int ret = 1;
-
_enter("{%lu},%lu", page->index, offset);
BUG_ON(!PageLocked(page));
if (PagePrivate(page)) {
-#ifdef AFS_CACHING_SUPPORT
- struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
- cachefs_uncache_page(vnode->cache,page);
-#endif
-
/* We release buffers only if the entire page is being
* invalidated.
* The get_block cached value has been unconditionally
* invalidated, so real IO is not possible anymore.
*/
- if (offset == 0) {
- BUG_ON(!PageLocked(page));
-
- ret = 0;
- if (!PageWriteback(page))
- ret = page->mapping->a_ops->releasepage(page,
- 0);
- /* possibly should BUG_ON(!ret); - neilb */
- }
+ if (offset == 0 && !PageWriteback(page))
+ page->mapping->a_ops->releasepage(page, 0);
}
- _leave(" = %d", ret);
+ _leave("");
+
} /* end afs_file_invalidatepage() */
/*****************************************************************************/
*/
static int afs_file_releasepage(struct page *page, gfp_t gfp_flags)
{
- struct cachefs_page *pageio;
-
_enter("{%lu},%x", page->index, gfp_flags);
- if (PagePrivate(page)) {
-#ifdef AFS_CACHING_SUPPORT
- struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
- cachefs_uncache_page(vnode->cache, page);
+#ifdef CONFIG_AFS_FSCACHE
+ wait_on_page_fs_misc(page);
+ fscache_uncache_page(AFS_FS_I(page->mapping->host)->cache, page);
+ ClearPagePrivate(page);
#endif
- pageio = (struct cachefs_page *) page_private(page);
- set_page_private(page, 0);
- ClearPagePrivate(page);
+ /* indicate that the page can be released */
+ _leave(" = 1");
+ return 1;
- kfree(pageio);
- }
+} /* end afs_file_releasepage() */
- _leave(" = 0");
+/*****************************************************************************/
+/*
+ * wait for the disc cache to finish writing before permitting modification of
+ * our page in the page cache
+ */
+#ifdef CONFIG_AFS_FSCACHE
+static int afs_file_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ wait_on_page_fs_misc(page);
return 0;
-} /* end afs_file_releasepage() */
+
+} /* end afs_file_page_mkwrite() */
+#endif
git://git.onelab.eu / linux-2.6.git / blobdiff