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afs: Make afs_init_request() get a key if not given a file

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In a future patch, AFS directory caching will go through netfslib and this
will involve, at times, running on behalf of ->lookup(), which doesn't
provide us with a file from which we can get an authentication key.

If a file isn't provided, make afs_init_request() get a key from the
process's keyrings instead when setting up a read.

Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20241216204124.3752367-21-dhowells@redhat.com
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-12-16 20:41:10 +00:00 committed by Christian Brauner
parent 49866ce7ea
commit b2604315e8
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1 changed files with 16 additions and 0 deletions
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16
fs/afs/file.c
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@ -372,10 +372,26 @@ static int afs_symlink_read_folio(struct file *file, struct folio *folio)
static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
{
struct afs_vnode *vnode = AFS_FS_I(rreq->inode);
if (file)
rreq->netfs_priv = key_get(afs_file_key(file));
rreq->rsize = 256 * 1024;
rreq->wsize = 256 * 1024 * 1024;
switch (rreq->origin) {
case NETFS_READ_SINGLE:
if (!file) {
struct key *key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key))
return PTR_ERR(key);
rreq->netfs_priv = key;
}
break;
default:
break;
}
return 0;
}