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FS-Cache: Make kAFS use FS-Cache

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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>
This commit is contained in:
David Howells
2009-04-03 16:42:41 +01:00
parent 9ae326a690
commit 9b3f26c911
13 changed files with 606 additions and 382 deletions
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31
fs/afs/inode.c
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@ -61,6 +61,11 @@ static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
return -EBADMSG;
}
#ifdef CONFIG_AFS_FSCACHE
if (vnode->status.size != inode->i_size)
fscache_attr_changed(vnode->cache);
#endif
inode->i_nlink = vnode->status.nlink;
inode->i_uid = vnode->status.owner;
inode->i_gid = 0;
@ -149,15 +154,6 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
return inode;
}
#ifdef AFS_CACHING_SUPPORT
/* set up caching before reading the status, as fetch-status reads the
* first page of symlinks to see if they're really mntpts */
cachefs_acquire_cookie(vnode->volume->cache,
NULL,
vnode,
&vnode->cache);
#endif
if (!status) {
/* it's a remotely extant inode */
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
@ -183,6 +179,15 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
}
}
/* set up caching before mapping the status, as map-status reads the
* first page of symlinks to see if they're really mountpoints */
inode->i_size = vnode->status.size;
#ifdef CONFIG_AFS_FSCACHE
vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
&afs_vnode_cache_index_def,
vnode);
#endif
ret = afs_inode_map_status(vnode, key);
if (ret < 0)
goto bad_inode;
@ -196,6 +201,10 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
/* failure */
bad_inode:
#ifdef CONFIG_AFS_FSCACHE
fscache_relinquish_cookie(vnode->cache, 0);
vnode->cache = NULL;
#endif
iget_failed(inode);
_leave(" = %d [bad]", ret);
return ERR_PTR(ret);
@ -340,8 +349,8 @@ void afs_clear_inode(struct inode *inode)
ASSERT(list_empty(&vnode->writebacks));
ASSERT(!vnode->cb_promised);
#ifdef AFS_CACHING_SUPPORT
cachefs_relinquish_cookie(vnode->cache, 0);
#ifdef CONFIG_AFS_FSCACHE
fscache_relinquish_cookie(vnode->cache, 0);
vnode->cache = NULL;
#endif