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ceph: rework PageFsCache handling

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With the new fscache API, the PageFsCache bit now indicates that the
page is being written to the cache and shouldn't be modified or released
until it's finished.

Change releasepage and invalidatepage to wait on that bit before
returning.

Also define FSCACHE_USE_NEW_IO_API so that we opt into the new fscache
API.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2021-01-21 16:27:14 -05:00 committed by Ilya Dryomov
parent e7df4524cd
commit 7c46b31809
2 changed files with 9 additions and 1 deletions
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9
fs/ceph/addr.c
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@ -146,6 +146,8 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc = page_snap_context(page);
wait_on_page_fscache(page);
inode = page->mapping->host;
ci = ceph_inode(inode);
@ -168,11 +170,16 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
ClearPagePrivate(page);
}
static int ceph_releasepage(struct page *page, gfp_t g)
static int ceph_releasepage(struct page *page, gfp_t gfp)
{
dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
page, page->index, PageDirty(page) ? "" : "not ");
if (PageFsCache(page)) {
if (!(gfp & __GFP_DIRECT_RECLAIM) || !(gfp & __GFP_FS))
return 0;
wait_on_page_fscache(page);
}
return !PagePrivate(page);
}

1
fs/ceph/super.h
View File

@ -21,6 +21,7 @@
#include <linux/ceph/libceph.h>
#ifdef CONFIG_CEPH_FSCACHE
#define FSCACHE_USE_NEW_IO_API
#include <linux/fscache.h>
#endif