diff options
author | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:41 +0400 |
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committer | David Howells <dhowells@redhat.com> | 2009-04-03 19:42:41 +0400 |
commit | 9b3f26c9110dcea62716aca9b8c68ceb482227ef (patch) | |
tree | f11fc0b125d6bc2149e99cb269073320ff50dba9 /fs/afs/write.c | |
parent | 9ae326a69004dea8af2dae4fde58de27db700a8d (diff) | |
download | linux-9b3f26c9110dcea62716aca9b8c68ceb482227ef.tar.xz |
FS-Cache: Make kAFS use FS-Cache
The attached patch makes the kAFS filesystem in fs/afs/ use FS-Cache, and
through it any attached caches. The kAFS filesystem will use caching
automatically if it's available.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
Diffstat (limited to 'fs/afs/write.c')
-rw-r--r-- | fs/afs/write.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/afs/write.c b/fs/afs/write.c index 3fb36d433621..c2e7a7ff0080 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -780,3 +780,24 @@ int afs_fsync(struct file *file, struct dentry *dentry, int datasync) _leave(" = %d", ret); return ret; } + +/* + * notification that a previously read-only page is about to become writable + * - if it returns an error, the caller will deliver a bus error signal + */ +int afs_page_mkwrite(struct vm_area_struct *vma, struct page *page) +{ + struct afs_vnode *vnode = AFS_FS_I(vma->vm_file->f_mapping->host); + + _enter("{{%x:%u}},{%lx}", + vnode->fid.vid, vnode->fid.vnode, page->index); + + /* wait for the page to be written to the cache before we allow it to + * be modified */ +#ifdef CONFIG_AFS_FSCACHE + fscache_wait_on_page_write(vnode->cache, page); +#endif + + _leave(" = 0"); + return 0; +} |